dvisvgm 1.8

git-svn-id: svn://tug.org/texlive/trunk@34783 c570f23f-e606-0410-a88d-b1316a301751

208 files changed, 6228 insertions, 351 deletions

diff --git a/Build/source/texk/README b/Build/source/texk/README
index da6c2499a45..6068197de2c 100644
--- a/Build/source/texk/README
+++ b/Build/source/texk/README
@@ -61,7 +61,7 @@ dvipos - ?
 
 dvipsk - maintained here, by us
 
-dvisvgm 1.7 - checked 20jun14
+dvisvgm 1.8 - checked 31jul14
   http://downloads.sourceforge.net/dvisvgm/
 
 gsftopk - from Paul Vojta's xdvi?
diff --git a/Build/source/texk/dvisvgm/ChangeLog b/Build/source/texk/dvisvgm/ChangeLog
index e500d48557a..7dccd7ae73e 100644
--- a/Build/source/texk/dvisvgm/ChangeLog
+++ b/Build/source/texk/dvisvgm/ChangeLog
@@ -1,3 +1,9 @@
+2014-07-31  Peter Breitenlohner  <peb@mppmu.mpg.de>
+
+	* Imported release 1.8.
+	* version.ac: Adapted.
+	* Makefile.am: Adjusted.
+
 2014-06-20  Peter Breitenlohner  <peb@mppmu.mpg.de>
 
 	* Imported release 1.7.
diff --git a/Build/source/texk/dvisvgm/Makefile.am b/Build/source/texk/dvisvgm/Makefile.am
index c4c89a85209..45e3be31947 100644
--- a/Build/source/texk/dvisvgm/Makefile.am
+++ b/Build/source/texk/dvisvgm/Makefile.am
@@ -22,7 +22,7 @@ EXTRA_DIST += $(DVISVGM_TREE)-PATCHES
 dist-hook:
 	rm -rf `find $(distdir) -name .svn -o -name .deps -o -name .dirstamp -o -name '*.$(OBJEXT)'`
 
-AM_CPPFLAGS = -I$(top_srcdir)/$(DVISVGM_TREE)/src
+AM_CPPFLAGS = -I$(top_srcdir)/$(DVISVGM_TREE)/clipper -I$(top_srcdir)/$(DVISVGM_TREE)/src
 AM_CPPFLAGS += $(KPATHSEA_INCLUDES) $(POTRACE_INCLUDES) $(FREETYPE2_INCLUDES)
 AM_CPPFLAGS += $(ZLIB_INCLUDES) $(LIBGS_INCLUDES)
 if WIN32
@@ -42,15 +42,16 @@ nodist_dvisvgm_SOURCES = \
 
 dvisvgm_dependencies = $(KPATHSEA_DEPEND) $(ZLIB_DEPEND) $(FREETYPE2_DEPEND)
 
-$(dvisvgm_OBJECTS): libdvisvgm.a
+$(dvisvgm_OBJECTS): $(noinst_LIBRARIES)
 
 LDADD = $(noinst_LIBRARIES) $(KPATHSEA_LIBS) $(POTRACE_LIBS) $(FREETYPE2_LIBS)
 LDADD += $(ZLIB_LIBS) $(LIBGS_LIBS)
 
-noinst_LIBRARIES = libdvisvgm.a
+noinst_LIBRARIES = libdvisvgm.a libclipper.a
 
 nodist_libdvisvgm_a_SOURCES = \
 	@DVISVGM_TREE@/src/BasicDVIReader.cpp \
+	@DVISVGM_TREE@/src/Bezier.cpp \
 	@DVISVGM_TREE@/src/BgColorSpecialHandler.cpp \
 	@DVISVGM_TREE@/src/Bitmap.cpp \
 	@DVISVGM_TREE@/src/BoundingBox.cpp \
@@ -103,6 +104,7 @@ nodist_libdvisvgm_a_SOURCES = \
 	@DVISVGM_TREE@/src/PdfSpecialHandler.cpp \
 	@DVISVGM_TREE@/src/PageRanges.cpp \
 	@DVISVGM_TREE@/src/PageSize.cpp \
+	@DVISVGM_TREE@/src/PathClipper.cpp \
 	@DVISVGM_TREE@/src/PreScanDVIReader.cpp \
 	@DVISVGM_TREE@/src/Process.cpp \
 	@DVISVGM_TREE@/src/PsSpecialHandler.cpp \
@@ -132,6 +134,9 @@ endif dlloader
 
 $(libdvisvgm_a_OBJECTS): $(POTRACE_DEPEND)
 
+nodist_libclipper_a_SOURCES = \
+	@DVISVGM_TREE@/clipper/clipper.cpp
+
 config.force: $(dvisvgm_dependencies)
 	echo timestamp >config.force
 	$(SHELL) ./config.status --recheck
diff --git a/Build/source/texk/dvisvgm/Makefile.in b/Build/source/texk/dvisvgm/Makefile.in
index a4a077df8a7..f0bbafd1e00 100644
--- a/Build/source/texk/dvisvgm/Makefile.in
+++ b/Build/source/texk/dvisvgm/Makefile.in
@@ -130,12 +130,18 @@ AM_V_AR = $(am__v_AR_@AM_V@)
 am__v_AR_ = $(am__v_AR_@AM_DEFAULT_V@)
 am__v_AR_0 = @echo "  AR      " $@;
 am__v_AR_1 = 
+libclipper_a_AR = $(AR) $(ARFLAGS)
+libclipper_a_LIBADD =
+am__dirstamp = $(am__leading_dot)dirstamp
+nodist_libclipper_a_OBJECTS =  \
+	@DVISVGM_TREE@/clipper/clipper.$(OBJEXT)
+libclipper_a_OBJECTS = $(nodist_libclipper_a_OBJECTS)
 libdvisvgm_a_AR = $(AR) $(ARFLAGS)
 libdvisvgm_a_LIBADD =
-am__dirstamp = $(am__leading_dot)dirstamp
 @dlloader_TRUE@am__objects_1 = @DVISVGM_TREE@/src/DLLoader.$(OBJEXT)
 nodist_libdvisvgm_a_OBJECTS =  \
 	@DVISVGM_TREE@/src/BasicDVIReader.$(OBJEXT) \
+	@DVISVGM_TREE@/src/Bezier.$(OBJEXT) \
 	@DVISVGM_TREE@/src/BgColorSpecialHandler.$(OBJEXT) \
 	@DVISVGM_TREE@/src/Bitmap.$(OBJEXT) \
 	@DVISVGM_TREE@/src/BoundingBox.$(OBJEXT) \
@@ -188,6 +194,7 @@ nodist_libdvisvgm_a_OBJECTS =  \
 	@DVISVGM_TREE@/src/PdfSpecialHandler.$(OBJEXT) \
 	@DVISVGM_TREE@/src/PageRanges.$(OBJEXT) \
 	@DVISVGM_TREE@/src/PageSize.$(OBJEXT) \
+	@DVISVGM_TREE@/src/PathClipper.$(OBJEXT) \
 	@DVISVGM_TREE@/src/PreScanDVIReader.$(OBJEXT) \
 	@DVISVGM_TREE@/src/Process.$(OBJEXT) \
 	@DVISVGM_TREE@/src/PsSpecialHandler.$(OBJEXT) \
@@ -257,7 +264,8 @@ AM_V_CXXLD = $(am__v_CXXLD_@AM_V@)
 am__v_CXXLD_ = $(am__v_CXXLD_@AM_DEFAULT_V@)
 am__v_CXXLD_0 = @echo "  CXXLD   " $@;
 am__v_CXXLD_1 = 
-SOURCES = $(nodist_libdvisvgm_a_SOURCES) $(nodist_dvisvgm_SOURCES)
+SOURCES = $(nodist_libclipper_a_SOURCES) \
+	$(nodist_libdvisvgm_a_SOURCES) $(nodist_dvisvgm_SOURCES)
 DIST_SOURCES =
 am__can_run_installinfo = \
   case $$AM_UPDATE_INFO_DIR in \
@@ -657,7 +665,8 @@ top_srcdir = @top_srcdir@
 #
 #************************************************************************
 EXTRA_DIST = $(DVISVGM_TREE) $(DVISVGM_TREE)-PATCHES $(TESTS)
-AM_CPPFLAGS = -I$(top_srcdir)/$(DVISVGM_TREE)/src $(KPATHSEA_INCLUDES) \
+AM_CPPFLAGS = -I$(top_srcdir)/$(DVISVGM_TREE)/clipper \
+	-I$(top_srcdir)/$(DVISVGM_TREE)/src $(KPATHSEA_INCLUDES) \
 	$(POTRACE_INCLUDES) $(FREETYPE2_INCLUDES) $(ZLIB_INCLUDES) \
 	$(LIBGS_INCLUDES) $(am__append_1)
 AM_CFLAGS = $(WARNING_CFLAGS)
@@ -672,8 +681,9 @@ nodist_dvisvgm_SOURCES = \
 dvisvgm_dependencies = $(KPATHSEA_DEPEND) $(ZLIB_DEPEND) $(FREETYPE2_DEPEND)
 LDADD = $(noinst_LIBRARIES) $(KPATHSEA_LIBS) $(POTRACE_LIBS) \
 	$(FREETYPE2_LIBS) $(ZLIB_LIBS) $(LIBGS_LIBS)
-noinst_LIBRARIES = libdvisvgm.a
+noinst_LIBRARIES = libdvisvgm.a libclipper.a
 nodist_libdvisvgm_a_SOURCES = @DVISVGM_TREE@/src/BasicDVIReader.cpp \
+	@DVISVGM_TREE@/src/Bezier.cpp \
 	@DVISVGM_TREE@/src/BgColorSpecialHandler.cpp \
 	@DVISVGM_TREE@/src/Bitmap.cpp \
 	@DVISVGM_TREE@/src/BoundingBox.cpp @DVISVGM_TREE@/src/CMap.cpp \
@@ -719,6 +729,7 @@ nodist_libdvisvgm_a_SOURCES = @DVISVGM_TREE@/src/BasicDVIReader.cpp \
 	@DVISVGM_TREE@/src/PdfSpecialHandler.cpp \
 	@DVISVGM_TREE@/src/PageRanges.cpp \
 	@DVISVGM_TREE@/src/PageSize.cpp \
+	@DVISVGM_TREE@/src/PathClipper.cpp \
 	@DVISVGM_TREE@/src/PreScanDVIReader.cpp \
 	@DVISVGM_TREE@/src/Process.cpp \
 	@DVISVGM_TREE@/src/PsSpecialHandler.cpp \
@@ -736,6 +747,9 @@ nodist_libdvisvgm_a_SOURCES = @DVISVGM_TREE@/src/BasicDVIReader.cpp \
 	@DVISVGM_TREE@/src/XMLDocument.cpp \
 	@DVISVGM_TREE@/src/XMLNode.cpp \
 	@DVISVGM_TREE@/src/XMLString.cpp $(am__append_2)
+nodist_libclipper_a_SOURCES = \
+	@DVISVGM_TREE@/clipper/clipper.cpp
+
 DISTCLEANFILES = config.force CXXLD.sh
 TESTS = tests/dvisvgm.test
 all: config.h
@@ -795,6 +809,20 @@ distclean-hdr:
 
 clean-noinstLIBRARIES:
 	-test -z "$(noinst_LIBRARIES)" || rm -f $(noinst_LIBRARIES)
+@DVISVGM_TREE@/clipper/$(am__dirstamp):
+	@$(MKDIR_P) @DVISVGM_TREE@/clipper
+	@: > @DVISVGM_TREE@/clipper/$(am__dirstamp)
+@DVISVGM_TREE@/clipper/$(DEPDIR)/$(am__dirstamp):
+	@$(MKDIR_P) @DVISVGM_TREE@/clipper/$(DEPDIR)
+	@: > @DVISVGM_TREE@/clipper/$(DEPDIR)/$(am__dirstamp)
+@DVISVGM_TREE@/clipper/clipper.$(OBJEXT):  \
+	@DVISVGM_TREE@/clipper/$(am__dirstamp) \
+	@DVISVGM_TREE@/clipper/$(DEPDIR)/$(am__dirstamp)
+
+libclipper.a: $(libclipper_a_OBJECTS) $(libclipper_a_DEPENDENCIES) $(EXTRA_libclipper_a_DEPENDENCIES) 
+	$(AM_V_at)-rm -f libclipper.a
+	$(AM_V_AR)$(libclipper_a_AR) libclipper.a $(libclipper_a_OBJECTS) $(libclipper_a_LIBADD)
+	$(AM_V_at)$(RANLIB) libclipper.a
 @DVISVGM_TREE@/src/$(am__dirstamp):
 	@$(MKDIR_P) @DVISVGM_TREE@/src
 	@: > @DVISVGM_TREE@/src/$(am__dirstamp)
@@ -804,6 +832,9 @@ clean-noinstLIBRARIES:
 @DVISVGM_TREE@/src/BasicDVIReader.$(OBJEXT):  \
 	@DVISVGM_TREE@/src/$(am__dirstamp) \
 	@DVISVGM_TREE@/src/$(DEPDIR)/$(am__dirstamp)
+@DVISVGM_TREE@/src/Bezier.$(OBJEXT):  \
+	@DVISVGM_TREE@/src/$(am__dirstamp) \
+	@DVISVGM_TREE@/src/$(DEPDIR)/$(am__dirstamp)
 @DVISVGM_TREE@/src/BgColorSpecialHandler.$(OBJEXT):  \
 	@DVISVGM_TREE@/src/$(am__dirstamp) \
 	@DVISVGM_TREE@/src/$(DEPDIR)/$(am__dirstamp)
@@ -957,6 +988,9 @@ clean-noinstLIBRARIES:
 @DVISVGM_TREE@/src/PageSize.$(OBJEXT):  \
 	@DVISVGM_TREE@/src/$(am__dirstamp) \
 	@DVISVGM_TREE@/src/$(DEPDIR)/$(am__dirstamp)
+@DVISVGM_TREE@/src/PathClipper.$(OBJEXT):  \
+	@DVISVGM_TREE@/src/$(am__dirstamp) \
+	@DVISVGM_TREE@/src/$(DEPDIR)/$(am__dirstamp)
 @DVISVGM_TREE@/src/PreScanDVIReader.$(OBJEXT):  \
 	@DVISVGM_TREE@/src/$(am__dirstamp) \
 	@DVISVGM_TREE@/src/$(DEPDIR)/$(am__dirstamp)
@@ -1089,12 +1123,15 @@ dvisvgm$(EXEEXT): $(dvisvgm_OBJECTS) $(dvisvgm_DEPENDENCIES) $(EXTRA_dvisvgm_DEP
 
 mostlyclean-compile:
 	-rm -f *.$(OBJEXT)
+	-rm -f @DVISVGM_TREE@/clipper/*.$(OBJEXT)
 	-rm -f @DVISVGM_TREE@/src/*.$(OBJEXT)
 
 distclean-compile:
 	-rm -f *.tab.c
 
+@AMDEP_TRUE@@am__include@ @am__quote@@DVISVGM_TREE@/clipper/$(DEPDIR)/clipper.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@@DVISVGM_TREE@/src/$(DEPDIR)/BasicDVIReader.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@@DVISVGM_TREE@/src/$(DEPDIR)/Bezier.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@@DVISVGM_TREE@/src/$(DEPDIR)/BgColorSpecialHandler.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@@DVISVGM_TREE@/src/$(DEPDIR)/Bitmap.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@@DVISVGM_TREE@/src/$(DEPDIR)/BoundingBox.Po@am__quote@
@@ -1147,6 +1184,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@@DVISVGM_TREE@/src/$(DEPDIR)/PSPreviewFilter.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@@DVISVGM_TREE@/src/$(DEPDIR)/PageRanges.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@@DVISVGM_TREE@/src/$(DEPDIR)/PageSize.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@@DVISVGM_TREE@/src/$(DEPDIR)/PathClipper.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@@DVISVGM_TREE@/src/$(DEPDIR)/PdfSpecialHandler.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@@DVISVGM_TREE@/src/$(DEPDIR)/PreScanDVIReader.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@@DVISVGM_TREE@/src/$(DEPDIR)/Process.Po@am__quote@
@@ -1666,6 +1704,8 @@ clean-generic:
 distclean-generic:
 	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
 	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+	-rm -f @DVISVGM_TREE@/clipper/$(DEPDIR)/$(am__dirstamp)
+	-rm -f @DVISVGM_TREE@/clipper/$(am__dirstamp)
 	-rm -f @DVISVGM_TREE@/src/$(DEPDIR)/$(am__dirstamp)
 	-rm -f @DVISVGM_TREE@/src/$(am__dirstamp)
 	-test -z "$(DISTCLEANFILES)" || rm -f $(DISTCLEANFILES)
@@ -1680,7 +1720,7 @@ clean-am: clean-binPROGRAMS clean-generic clean-libtool \
 
 distclean: distclean-am
 	-rm -f $(am__CONFIG_DISTCLEAN_FILES)
-	-rm -rf @DVISVGM_TREE@/src/$(DEPDIR)
+	-rm -rf @DVISVGM_TREE@/clipper/$(DEPDIR) @DVISVGM_TREE@/src/$(DEPDIR)
 	-rm -f Makefile
 distclean-am: clean-am distclean-compile distclean-generic \
 	distclean-hdr distclean-libtool distclean-tags
@@ -1728,7 +1768,7 @@ installcheck-am:
 maintainer-clean: maintainer-clean-am
 	-rm -f $(am__CONFIG_DISTCLEAN_FILES)
 	-rm -rf $(top_srcdir)/autom4te.cache
-	-rm -rf @DVISVGM_TREE@/src/$(DEPDIR)
+	-rm -rf @DVISVGM_TREE@/clipper/$(DEPDIR) @DVISVGM_TREE@/src/$(DEPDIR)
 	-rm -f Makefile
 maintainer-clean-am: distclean-am maintainer-clean-generic
 
@@ -1775,7 +1815,7 @@ uninstall-man: uninstall-man1
 dist-hook:
 	rm -rf `find $(distdir) -name .svn -o -name .deps -o -name .dirstamp -o -name '*.$(OBJEXT)'`
 
-$(dvisvgm_OBJECTS): libdvisvgm.a
+$(dvisvgm_OBJECTS): $(noinst_LIBRARIES)
 
 $(libdvisvgm_a_OBJECTS): $(POTRACE_DEPEND)
 
diff --git a/Build/source/texk/dvisvgm/configure b/Build/source/texk/dvisvgm/configure
index 2ccd01dda60..737aaf13489 100755
--- a/Build/source/texk/dvisvgm/configure
+++ b/Build/source/texk/dvisvgm/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.69 for dvisvgm (TeX Live) 1.7.
+# Generated by GNU Autoconf 2.69 for dvisvgm (TeX Live) 1.8.
 #
 # Report bugs to <tex-k@tug.org>.
 #
@@ -590,12 +590,12 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='dvisvgm (TeX Live)'
 PACKAGE_TARNAME='dvisvgm--tex-live-'
-PACKAGE_VERSION='1.7'
-PACKAGE_STRING='dvisvgm (TeX Live) 1.7'
+PACKAGE_VERSION='1.8'
+PACKAGE_STRING='dvisvgm (TeX Live) 1.8'
 PACKAGE_BUGREPORT='tex-k@tug.org'
 PACKAGE_URL=''
 
-ac_unique_file="dvisvgm-1.7/src/dvisvgm.cpp"
+ac_unique_file="dvisvgm-1.8/src/dvisvgm.cpp"
 # Factoring default headers for most tests.
 ac_includes_default="\
 #include <stdio.h>
@@ -1372,7 +1372,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures dvisvgm (TeX Live) 1.7 to adapt to many kinds of systems.
+\`configure' configures dvisvgm (TeX Live) 1.8 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1443,7 +1443,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of dvisvgm (TeX Live) 1.7:";;
+     short | recursive ) echo "Configuration of dvisvgm (TeX Live) 1.8:";;
    esac
   cat <<\_ACEOF
 
@@ -1581,7 +1581,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-dvisvgm (TeX Live) configure 1.7
+dvisvgm (TeX Live) configure 1.8
 generated by GNU Autoconf 2.69
 
 Copyright (C) 2012 Free Software Foundation, Inc.
@@ -2403,7 +2403,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by dvisvgm (TeX Live) $as_me 1.7, which was
+It was created by dvisvgm (TeX Live) $as_me 1.8, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   $ $0 $@
@@ -7894,7 +7894,7 @@ fi
 
 # Define the identity of the package.
  PACKAGE='dvisvgm--tex-live-'
- VERSION='1.7'
+ VERSION='1.8'
 
 
 cat >>confdefs.h <<_ACEOF
@@ -17755,7 +17755,7 @@ Usage: $0 [OPTIONS]
 Report bugs to <bug-libtool@gnu.org>."
 
 lt_cl_version="\
-dvisvgm (TeX Live) config.lt 1.7
+dvisvgm (TeX Live) config.lt 1.8
 configured by $0, generated by GNU Autoconf 2.69.
 
 Copyright (C) 2011 Free Software Foundation, Inc.
@@ -19566,7 +19566,7 @@ $as_echo "#define KPSE_CXX_UNSAFE 1" >>confdefs.h
 
 fi
 
-DVISVGM_TREE=dvisvgm-1.7
+DVISVGM_TREE=dvisvgm-1.8
 
 
 ac_config_files="$ac_config_files Makefile"
@@ -20118,7 +20118,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by dvisvgm (TeX Live) $as_me 1.7, which was
+This file was extended by dvisvgm (TeX Live) $as_me 1.8, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -20184,7 +20184,7 @@ _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
-dvisvgm (TeX Live) config.status 1.7
+dvisvgm (TeX Live) config.status 1.8
 configured by $0, generated by GNU Autoconf 2.69,
   with options \\"\$ac_cs_config\\"
 
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7-PATCHES/patch-01-cygwin b/Build/source/texk/dvisvgm/dvisvgm-1.7-PATCHES/patch-01-cygwin
deleted file mode 100644
index 47f5f74531a..00000000000
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7-PATCHES/patch-01-cygwin
+++ /dev/null
@@ -1,15 +0,0 @@
-diff -ur dvisvgm-1.7.orig/src/Ghostscript.cpp dvisvgm-1.7/src/Ghostscript.cpp
---- dvisvgm-1.7.orig/src/Ghostscript.cpp	2014-06-10 15:05:24.000000000 +0200
-+++ dvisvgm-1.7/src/Ghostscript.cpp	2014-06-25 11:45:36.000000000 +0200
-@@ -63,7 +63,11 @@
- 	const int abi_min=7, abi_max=9; // supported libgs ABI versions
- 	for (int i=abi_max; i >= abi_min; i--) {
- 		ostringstream oss;
-+#if defined(__CYGWIN__)
-+		oss << "cyggs-" << i << ".dll";
-+#else
- 		oss << "libgs.so." << i;
-+#endif
- 		DLLoader loader(oss.str().c_str());
- 		if (loader.loaded())
- 			return oss.str();
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/doc/README b/Build/source/texk/dvisvgm/dvisvgm-1.7/doc/README
deleted file mode 100644
index 6ecfc542aa3..00000000000
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/doc/README
+++ /dev/null
@@ -1,12 +0,0 @@
-dvisvgm-1.6 (2014-04-22)
-- added option --zoom to "visually" scale the generated SVG graphics while
-  preserving the original size and position values of the graphic objects
-- extended argument syntax of option --linkmark to allow to select the
-  box/line color
-- changed default link marker from 'line' to 'box'
-- changed link markers to be only split on line breaks while extended in all
-  other cases
-- if libgs is not directly linked to the binary, dvisvgm now looks for
-  libgs.so.X instead of libgs.so (supported GS ABIs: X = 7, 8, 9)
-- removed time stamp and machine triplet from generated SVG files
-- some code improvements and refactorings
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/psdefs.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.7/src/psdefs.cpp
deleted file mode 100644
index 4edce3af1d8..00000000000
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/psdefs.cpp
+++ /dev/null
@@ -1,83 +0,0 @@
-/*************************************************************************
-** psdefs.cpp                                                           **
-**                                                                      **
-** This file is part of dvisvgm -- the DVI to SVG converter             **
-** Copyright (C) 2005-2014 Martin Gieseking <martin.gieseking@uos.de>   **
-**                                                                      **
-** This program is free software; you can redistribute it and/or        **
-** modify it under the terms of the GNU General Public License as       **
-** published by the Free Software Foundation; either version 3 of       **
-** the License, or (at your option) any later version.                  **
-**                                                                      **
-** This program is distributed in the hope that it will be useful, but  **
-** WITHOUT ANY WARRANTY; without even the implied warranty of           **
-** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the         **
-** GNU General Public License for more details.                         **
-**                                                                      **
-** You should have received a copy of the GNU General Public License    **
-** along with this program; if not, see <http://www.gnu.org/licenses/>. **
-*************************************************************************/
-
-#include "PSInterpreter.h"
-
-const char *PSInterpreter::PSDEFS =
-"3 dict dup begin/Install{matrix setmatrix}def/HWResolution[72 72]def/PageSize[10"
-"000 10000]def end setpagedevice/@dodraw true store/@patcnt 0 store/@SD systemdic"
-"t def/@UD userdict def true setglobal @SD/:save @SD/save get put @SD/:restore @S"
-"D/restore get put @SD/:gsave @SD/gsave get put @SD/:grestore @SD/grestore get pu"
-"t @SD/:grestoreall @SD/grestoreall get put @SD/:stroke @SD/stroke get put @SD/:f"
-"ill @SD/fill get put @SD/:eofill @SD/eofill get put @SD/:clip @SD/clip get put @"
-"SD/:eoclip @SD/eoclip get put @SD/:charpath @SD/charpath get put @SD/:show @SD/s"
-"how get put @SD/.setopacityalpha known not{@SD/.setopacityalpha{pop}put}if @SD/p"
-"rseq{-1 1{-1 roll =only( )print}for(\\n)print}put @SD/prcmd{( )exch(\\ndvi.)3{pr"
-"int}repeat prseq}put @SD/cvxall{{cvx}forall}put @SD/defpr{[exch[/copy @SD]cvxall"
-" 5 -1 roll dup 6 1 roll[/get/exec]cvxall 6 -1 roll dup 7 1 roll 4 -1 roll dup 5 "
-"1 roll dup length string cvs/prcmd cvx]cvx def}put @SD/querypos{{currentpoint}st"
-"opped{$error/newerror false put}{2(querypos)prcmd}ifelse}put @SD/applyscalevals{"
-"1 0 transform 0 0 transform 3 -1 roll sub dup mul 3 1 roll sub dup mul add sqrt "
-"0 1 transform 0 0 transform 3 -1 roll sub dup mul 3 1 roll sub dup mul add sqrt "
-"1 0 transform dup mul exch dup dup mul 3 -1 roll add sqrt div 3(applyscalevals)p"
-"rcmd}put @SD/prpath{{2(moveto)prcmd}{2(lineto)prcmd}{6(curveto)prcmd}{0(closepat"
-"h)prcmd}pathforall}put @SD/charpath{/@dodraw false store :charpath/@dodraw true "
-"store}put @SD/show{@dodraw{dup :gsave currentpoint newpath moveto true charpath "
-"eofill :grestore :show}if}put @SD/stroke{@dodraw{0(newpath)prcmd prpath 0(stroke"
-")prcmd newpath}{:stroke}ifelse}put @SD/fill{@dodraw{0(newpath)prcmd prpath 0(fil"
-"l)prcmd newpath}{:fill}ifelse}put @SD/eofill{@dodraw{0(newpath)prcmd prpath 0(eo"
-"fill)prcmd newpath}{:eofill}ifelse}put @SD/clip{:clip 0(newpath)prcmd prpath 0(c"
-"lip)prcmd}put @SD/eoclip{:eoclip 0(newpath)prcmd prpath 0(eoclip)prcmd}put @SD/b"
-"op{pop pop}put/@rect{4 -2 roll moveto exch dup 0 rlineto exch 0 exch rlineto neg"
-" 0 rlineto closepath}bind def/@rectcc{4 -2 roll moveto 2 copy 0 lt exch 0 lt xor"
-"{dup 0 exch rlineto exch 0 rlineto neg 0 exch rlineto}{exch dup 0 rlineto exch 0"
-" exch rlineto neg 0 rlineto}ifelse closepath}bind def @SD/rectclip{newpath dup t"
-"ype/arraytype eq{aload length 4 idiv{@rectcc}repeat}{@rectcc}ifelse clip newpath"
-"}put @SD/rectfill{gsave newpath dup type/arraytype eq{aload length 4 idiv{@rectc"
-"c}repeat}{@rectcc}ifelse fill grestore}put @SD/rectstroke{gsave newpath dup type"
-"/arraytype eq{aload length 4 idiv{@rect}repeat}{@rect}ifelse stroke grestore}put"
-" false setglobal @SD readonly pop/initclip 0 defpr/sysexec{@SD exch get exec}def"
-"/adddot{dup length 1 add string dup 0 46 put dup 3 -1 roll 1 exch putinterval}de"
-"f/setlinewidth{dup/setlinewidth sysexec applyscalevals 1(setlinewidth)prcmd}def/"
-"setlinecap 1 defpr/setlinejoin 1 defpr/setmiterlimit 1 defpr/setdash{mark 3 1 ro"
-"ll 2 copy/setdash sysexec applyscalevals exch aload length 1 add -1 roll countto"
-"mark(setdash)prcmd pop}def/setgstate{currentlinewidth 1(setlinewidth)prcmd curre"
-"ntlinecap 1(setlinecap)prcmd currentlinejoin 1(setlinejoin)prcmd currentmiterlim"
-"it 1(setmiterlimit)prcmd currentrgbcolor 3(setrgbcolor)prcmd 6 array currentmatr"
-"ix aload pop 6(setmatrix)prcmd currentdash mark 3 1 roll exch aload length 1 add"
-" -1 roll counttomark(setdash)prcmd pop}def/save{@UD begin/@saveID vmstatus pop p"
-"op def end :save @saveID 1(save)prcmd}def/restore{:restore setgstate @UD/@saveID"
-" known{@UD begin @saveID end}{0}ifelse 1(restore)prcmd}def/gsave 0 defpr/grestor"
-"e{:grestore setgstate 0(grestore)prcmd}def/grestoreall{:grestoreall setstate 0(g"
-"restoreall)prcmd}def/rotate{dup type/arraytype ne{dup 1(rotate)prcmd}if/rotate s"
-"ysexec}def/scale{dup type/arraytype ne{2 copy 2(scale)prcmd}if/scale sysexec}def"
-"/translate{dup type/arraytype ne{2 copy 2(translate)prcmd}if/translate sysexec}d"
-"ef/setmatrix{dup/setmatrix sysexec aload pop 6(setmatrix)prcmd}def/initmatrix{ma"
-"trix setmatrix}def/concat{matrix currentmatrix matrix concatmatrix setmatrix}def"
-"/makepattern{gsave <</mx 3 -1 roll >> begin dup/XUID[1000000 @patcnt]put mx/make"
-"pattern sysexec dup dup begin PatternType @patcnt BBox aload pop XStep YStep Pai"
-"ntType mx aload pop 15(makepattern)prcmd newpath matrix setmatrix PaintProc 0 1("
-"makepattern)prcmd end/@patcnt @patcnt 1 add store end grestore}def/setpattern{be"
-"gin PatternType 1 eq{PaintType 1 eq{XUID aload pop exch pop 1}{:gsave[currentcol"
-"orspace aload length -1 roll pop]setcolorspace/setcolor sysexec XUID aload pop e"
-"xch pop currentrgbcolor :grestore 4}ifelse(setpattern)prcmd}{/setpattern sysexec"
-"}ifelse end}def/setcolor{dup type/dicttype eq{setpattern}{/setcolor sysexec}ifel"
-"se}def/setgray 1 defpr/setcmykcolor 4 defpr/sethsbcolor 3 defpr/setrgbcolor 3 de"
-"fpr/.setopacityalpha{dup/.setopacityalpha sysexec 1(setopacityalpha)prcmd}def ";
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7-PATCHES/ChangeLog b/Build/source/texk/dvisvgm/dvisvgm-1.8-PATCHES/ChangeLog
index 5459329ba65..9c1da1c7cb2 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7-PATCHES/ChangeLog
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8-PATCHES/ChangeLog
@@ -1,3 +1,8 @@
+2014-07-31  Peter Breitenlohner  <peb@mppmu.mpg.de>
+
+	* Import release 1.8.
+	* patch-01-cygwin (removed): Included upstream.
+
 2014-06-25  Peter Breitenlohner  <peb@mppmu.mpg.de>
 
 	* patch-01-cygwin (new): Cygwin soname for gs library.
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7-PATCHES/TL-Changes b/Build/source/texk/dvisvgm/dvisvgm-1.8-PATCHES/TL-Changes
index f42f746ea91..29913179366 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7-PATCHES/TL-Changes
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8-PATCHES/TL-Changes
@@ -1,4 +1,4 @@
-Changes applied to the dvisvgm-1.7 tree as obtained from:
+Changes applied to the dvisvgm-1.8 tree as obtained from:
 	http://downloads.sourceforge.net/dvisvgm/
 
 Removed:
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/AUTHORS b/Build/source/texk/dvisvgm/dvisvgm-1.8/AUTHORS
index d9b6468421e..d9b6468421e 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/AUTHORS
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/AUTHORS
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/COPYING b/Build/source/texk/dvisvgm/dvisvgm-1.8/COPYING
index 94a9ed024d3..94a9ed024d3 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/COPYING
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/COPYING
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/ChangeLog b/Build/source/texk/dvisvgm/dvisvgm-1.8/ChangeLog
index c601847210e..a0ffb165fab 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/ChangeLog
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/ChangeLog
@@ -1,3 +1,92 @@
+2014-07-29  Martin Gieseking  <martin.gieseking@uos.de>
+
+  * NEWS: 
+  updated NEWS 
+
+2014-07-28  Martin Gieseking  <martin.gieseking@uos.de>
+
+  * configure.ac, src/Doxyfile: 
+  set version to 1.8 
+
+  * src/GraphicPath.h, src/PSInterpreter.cpp, src/PSInterpreter.h, 
+    src/PsSpecialHandler.cpp, src/PsSpecialHandler.h, src/psdefs.cpp, 
+    src/psdefs.ps, tests/PSInterpreterTest.cpp: 
+  added evaluation of PS operator 'clippath' (copies clipping path into 
+  graphics path) 
+
+2014-07-26  Martin Gieseking  <martin.gieseking@uos.de>
+
+  * src/Font.cpp, src/GFGlyphTracer.cpp, src/GraphicPath.h, 
+    src/PsSpecialHandler.cpp: 
+  renamed GraphicPath::newpath() to GraphicPath::clear() 
+
+2014-07-24  Martin Gieseking  <martin.gieseking@uos.de>
+
+  * src/InputReader.cpp, src/PSInterpreter.cpp: 
+  ensure that InputReader::compare() checks whole and not just partial 
+  words 
+
+2014-07-22  Martin Gieseking  <martin.gieseking@uos.de>
+
+  * doc/dvisvgm.txt.in, src/CommandLine.cpp, src/CommandLine.h, 
+    src/PsSpecialHandler.cpp, src/PsSpecialHandler.h, src/dvisvgm.cpp, 
+    src/options.xml: 
+  added option --clippath to compute the intersection of clipping paths 
+
+  * README, README.md, src/Bezier.cpp, src/Bezier.h, src/GraphicPath.h, 
+    src/Makefile.am, src/PathClipper.cpp, src/PathClipper.h, src/dvisvgm.cpp: 
+  added class PathClipper to compute intersections of closed curved 
+  graphics paths 
+
+  * src/GraphicPath.h: 
+  added field to store the winding rule to class GraphicPath 
+
+  * Makefile.am, clipper/License.txt, clipper/Makefile.am, 
+    clipper/clipper.cpp, clipper/clipper.hpp, configure.ac, src/Makefile.am: 
+  added slightly modified sources of clipper library (computes boolops on 
+  polygons) 
+
+  * src/DVIToSVG.h, src/dvisvgm.cpp: 
+  prevent throwing a DVIException when option -l is present 
+
+2014-07-20  Khaled Hosny  <khaledhosny@eglug.org>
+
+  * src/FontEngine.cpp: 
+  free existing FT_Face before creating a new one 
+
+2014-07-18  Martin Gieseking  <martin.gieseking@uos.de>
+
+  * src/TpicSpecialHandler.cpp: 
+  TPIC handler: use class GraphicPath to create SVG path commands 
+
+  * doc/dvisvgm.txt.in, src/CommandLine.cpp, src/CommandLine.h, 
+    src/GraphicPath.h, src/PsSpecialHandler.cpp, src/SVGTree.cpp, 
+    src/SVGTree.h, src/dvisvgm.cpp, src/options.xml, 
+    tests/GraphicPathTest.cpp: 
+  added option to create relative rather than absolute path commands 
+
+2014-07-07  Martin Gieseking  <martin.gieseking@uos.de>
+
+  * src/DVIToSVGActions.h, src/Doxyfile, src/HtmlSpecialHandler.h, 
+    src/RangeMap.cpp, src/SpecialManager.cpp, src/ToUnicodeMap.cpp: 
+  fixed a couple of broken doxygen comments 
+
+2014-06-25  Martin Gieseking  <martin.gieseking@uos.de>
+
+  * src/Ghostscript.cpp: 
+  get proper name of Ghostscript library when building for Cygwin 
+
+2014-06-23  Martin Gieseking  <martin.gieseking@uos.de>
+
+  * README.md: 
+  added markdown version of README 
+
+2014-06-20  Martin Gieseking  <martin.gieseking@uos.de>
+
+  * src/psdefs.cpp, src/psdefs.ps: 
+  suppress output of PS operator ':show' to prevent the creation of 
+  additional graphic elements 
+
 2014-06-17  Martin Gieseking  <martin.gieseking@uos.de>
 
   * NEWS: 
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/INSTALL b/Build/source/texk/dvisvgm/dvisvgm-1.8/INSTALL
index a4b34144dcf..a4b34144dcf 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/INSTALL
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/INSTALL
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/LGPL-2.1.txt b/Build/source/texk/dvisvgm/dvisvgm-1.8/LGPL-2.1.txt
index 602bfc94635..602bfc94635 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/LGPL-2.1.txt
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/LGPL-2.1.txt
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/Makefile.am b/Build/source/texk/dvisvgm/dvisvgm-1.8/Makefile.am
index b73dbf588f8..c4675c016e0 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/Makefile.am
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/Makefile.am
@@ -5,5 +5,5 @@
 
 AUTOMAKE_OPTIONS = foreign
 EXTRA_DIST = COPYING LGPL-2.1.txt
-SUBDIRS = src tests doc
+SUBDIRS = clipper src tests doc
 
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/NEWS b/Build/source/texk/dvisvgm/dvisvgm-1.8/NEWS
index 34228a9dbb9..51245c1bf36 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/NEWS
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/NEWS
@@ -1,3 +1,15 @@
+dvisvgm-1.8 (2014-07-29)
+- added option --clipjoin which tells dvisvgm to compute intersections
+  of clipping paths itself and not to delegate this task to the SVG renderer
+- added option --relative to create relative rather than absolute path commands
+- added evaluation of PS operator 'clippath' which copies the current clipping
+  path into the graphics path
+- fixed PS operator 'show' to prevent the creation of unintended path overlays
+- fixed memory leak in class FontEngine  (patch by Khaled Hosny)
+- fixed unintended throwing of a DVIException when dvisvgm is called with
+  option --list-specials
+- Cygwin builds of dvisvgm now look for the proper filename of the Ghostscript DLL
+
 dvisvgm-1.7 (2014-06-18)
 - all DVI files are pre-processed now to allow the implementation of
   advanced features that rely on data not available on the pages being
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/README b/Build/source/texk/dvisvgm/dvisvgm-1.8/README
index 2454a2a23f4..e0d3b3fd6c5 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/README
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/README
@@ -9,9 +9,14 @@ DESCRIPTION
 DEPENDENCIES
 
  dvisvgm relies on the following free libraries:
+   * Clipper (http://www.angusj.com/delphi/clipper.php)
+     To compute the insersections of two curved paths, dvisvgm
+     flattens the paths to polygons, intersects them using Clipper,
+     and reconstructs the curves afterwards.
+
    * FreeType 2 (http://www.freetype.org)
-     This library is used to extract glyph outlines
-     from PFB files.
+     This library is used to extract the glyph outlines
+     from vector fonts (PFB, OTF, TTF).
 
    * Ghostscript (http://pages.cs.wisc.edu/~ghost)
      The PostScript special handler requires the Ghostscript
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.8/clipper/Makefile.am b/Build/source/texk/dvisvgm/dvisvgm-1.8/clipper/Makefile.am
new file mode 100644
index 00000000000..a24a478e587
--- /dev/null
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/clipper/Makefile.am
@@ -0,0 +1,7 @@
+noinst_LIBRARIES = libclipper.a
+libclipper_a_SOURCES = clipper.cpp clipper.hpp
+
+AM_CXXFLAGS = -Wall
+
+clipper.cpp: clipper.hpp
+
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.8/clipper/clipper.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/clipper/clipper.cpp
new file mode 100644
index 00000000000..a6dbae285cf
--- /dev/null
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/clipper/clipper.cpp
@@ -0,0 +1,4464 @@
+/*******************************************************************************
+*                                                                              *
+* Author    :  Angus Johnson                                                   *
+* Version   :  6.1.5                                                           *
+* Date      :  16 July 2014                                                    *
+* Website   :  http://www.angusj.com                                           *
+* Copyright :  Angus Johnson 2010-2014                                         *
+*                                                                              *
+* License:                                                                     *
+* Use, modification & distribution is subject to Boost Software License Ver 1. *
+* http://www.boost.org/LICENSE_1_0.txt                                         *
+*                                                                              *
+* Attributions:                                                                *
+* The code in this library is an extension of Bala Vatti's clipping algorithm: *
+* "A generic solution to polygon clipping"                                     *
+* Communications of the ACM, Vol 35, Issue 7 (July 1992) pp 56-63.             *
+* http://portal.acm.org/citation.cfm?id=129906                                 *
+*                                                                              *
+* Computer graphics and geometric modeling: implementation and algorithms      *
+* By Max K. Agoston                                                            *
+* Springer; 1 edition (January 4, 2005)                                        *
+* http://books.google.com/books?q=vatti+clipping+agoston                       *
+*                                                                              *
+* See also:                                                                    *
+* "Polygon Offsetting by Computing Winding Numbers"                            *
+* Paper no. DETC2005-85513 pp. 565-575                                         *
+* ASME 2005 International Design Engineering Technical Conferences             *
+* and Computers and Information in Engineering Conference (IDETC/CIE2005)      *
+* September 24-28, 2005 , Long Beach, California, USA                          *
+* http://www.me.berkeley.edu/~mcmains/pubs/DAC05OffsetPolygon.pdf              *
+*                                                                              *
+*******************************************************************************/
+
+/*******************************************************************************
+*                                                                              *
+* This is a translation of the Delphi Clipper library and the naming style     *
+* used has retained a Delphi flavour.                                          *
+*                                                                              *
+*******************************************************************************/
+
+#include "clipper.hpp"
+#include <cmath>
+#include <vector>
+#include <algorithm>
+#include <stdexcept>
+#include <cstring>
+#include <cstdlib>
+#include <ostream>
+#include <functional>
+
+namespace ClipperLib {
+
+static double const pi = 3.141592653589793238;
+static double const two_pi = pi *2;
+static double const def_arc_tolerance = 0.25;
+
+enum Direction { dRightToLeft, dLeftToRight };
+
+static int const Unassigned = -1;  //edge not currently 'owning' a solution
+static int const Skip = -2;        //edge that would otherwise close a path
+
+#define HORIZONTAL (-1.0E+40)
+#define TOLERANCE (1.0e-20)
+#define NEAR_ZERO(val) (((val) > -TOLERANCE) && ((val) < TOLERANCE))
+
+struct TEdge {
+  IntPoint Bot;
+  IntPoint Curr;
+  IntPoint Top;
+  IntPoint Delta;
+  double Dx;
+  PolyType PolyTyp;
+  EdgeSide Side;
+  int WindDelta; //1 or -1 depending on winding direction
+  int WindCnt;
+  int WindCnt2; //winding count of the opposite polytype
+  int OutIdx;
+  TEdge *Next;
+  TEdge *Prev;
+  TEdge *NextInLML;
+  TEdge *NextInAEL;
+  TEdge *PrevInAEL;
+  TEdge *NextInSEL;
+  TEdge *PrevInSEL;
+};
+
+struct IntersectNode {
+  TEdge          *Edge1;
+  TEdge          *Edge2;
+  IntPoint        Pt;
+};
+
+struct LocalMinimum {
+  cInt          Y;
+  TEdge        *LeftBound;
+  TEdge        *RightBound;
+};
+
+struct OutPt;
+
+struct OutRec {
+  int       Idx;
+  bool      IsHole;
+  bool      IsOpen;
+  OutRec   *FirstLeft;  //see comments in clipper.pas
+  PolyNode *PolyNd;
+  OutPt    *Pts;
+  OutPt    *BottomPt;
+};
+
+struct OutPt {
+  int       Idx;
+  IntPoint  Pt;
+  OutPt    *Next;
+  OutPt    *Prev;
+};
+
+struct Join {
+  OutPt    *OutPt1;
+  OutPt    *OutPt2;
+  IntPoint  OffPt;
+};
+
+struct LocMinSorter
+{
+  inline bool operator()(const LocalMinimum& locMin1, const LocalMinimum& locMin2)
+  {
+    return locMin2.Y < locMin1.Y;
+  }
+};
+
+//------------------------------------------------------------------------------
+//------------------------------------------------------------------------------
+
+inline cInt Round(double val)
+{
+  if ((val < 0)) return static_cast<cInt>(val - 0.5); 
+  else return static_cast<cInt>(val + 0.5);
+}
+//------------------------------------------------------------------------------
+
+inline cInt Abs(cInt val)
+{
+  return val < 0 ? -val : val;
+}
+
+//------------------------------------------------------------------------------
+// PolyTree methods ...
+//------------------------------------------------------------------------------
+
+void PolyTree::Clear()
+{
+    for (PolyNodes::size_type i = 0; i < AllNodes.size(); ++i)
+      delete AllNodes[i];
+    AllNodes.resize(0); 
+    Childs.resize(0);
+}
+//------------------------------------------------------------------------------
+
+PolyNode* PolyTree::GetFirst() const
+{
+  if (!Childs.empty())
+      return Childs[0];
+  else
+      return 0;
+}
+//------------------------------------------------------------------------------
+
+int PolyTree::Total() const
+{
+  return (int)AllNodes.size();
+}
+
+//------------------------------------------------------------------------------
+// PolyNode methods ...
+//------------------------------------------------------------------------------
+
+PolyNode::PolyNode(): Childs(), Parent(0), Index(0), m_IsOpen(false)
+{
+}
+//------------------------------------------------------------------------------
+
+int PolyNode::ChildCount() const
+{
+  return (int)Childs.size();
+}
+//------------------------------------------------------------------------------
+
+void PolyNode::AddChild(PolyNode& child)
+{
+  unsigned cnt = (unsigned)Childs.size();
+  Childs.push_back(&child);
+  child.Parent = this;
+  child.Index = cnt;
+}
+//------------------------------------------------------------------------------
+
+PolyNode* PolyNode::GetNext() const
+{ 
+  if (!Childs.empty()) 
+      return Childs[0]; 
+  else
+      return GetNextSiblingUp();    
+}  
+//------------------------------------------------------------------------------
+
+PolyNode* PolyNode::GetNextSiblingUp() const
+{ 
+  if (!Parent) //protects against PolyTree.GetNextSiblingUp()
+      return 0;
+  else if (Index == Parent->Childs.size() - 1)
+      return Parent->GetNextSiblingUp();
+  else
+      return Parent->Childs[Index + 1];
+}  
+//------------------------------------------------------------------------------
+
+bool PolyNode::IsHole() const
+{ 
+  bool result = true;
+  PolyNode* node = Parent;
+  while (node)
+  {
+      result = !result;
+      node = node->Parent;
+  }
+  return result;
+}  
+//------------------------------------------------------------------------------
+
+bool PolyNode::IsOpen() const
+{ 
+  return m_IsOpen;
+}  
+//------------------------------------------------------------------------------
+
+#ifndef use_int32
+
+//------------------------------------------------------------------------------
+// Int128 class (enables safe math on signed 64bit integers)
+// eg Int128 val1((long64)9223372036854775807); //ie 2^63 -1
+//    Int128 val2((long64)9223372036854775807);
+//    Int128 val3 = val1 * val2;
+//    val3.AsString => "85070591730234615847396907784232501249" (8.5e+37)
+//------------------------------------------------------------------------------
+
+class Int128
+{
+  public:
+    ulong64 lo;
+    long64 hi;
+
+    Int128(long64 _lo = 0)
+    {
+      lo = (ulong64)_lo;   
+      if (_lo < 0)  hi = -1; else hi = 0; 
+    }
+
+
+    Int128(const Int128 &val): lo(val.lo), hi(val.hi){}
+
+    Int128(const long64& _hi, const ulong64& _lo): lo(_lo), hi(_hi){}
+    
+    Int128& operator = (const long64 &val)
+    {
+      lo = (ulong64)val;
+      if (val < 0) hi = -1; else hi = 0;
+      return *this;
+    }
+
+    bool operator == (const Int128 &val) const
+      {return (hi == val.hi && lo == val.lo);}
+
+    bool operator != (const Int128 &val) const
+      { return !(*this == val);}
+
+    bool operator > (const Int128 &val) const
+    {
+      if (hi != val.hi)
+        return hi > val.hi;
+      else
+        return lo > val.lo;
+    }
+
+    bool operator < (const Int128 &val) const
+    {
+      if (hi != val.hi)
+        return hi < val.hi;
+      else
+        return lo < val.lo;
+    }
+
+    bool operator >= (const Int128 &val) const
+      { return !(*this < val);}
+
+    bool operator <= (const Int128 &val) const
+      { return !(*this > val);}
+
+    Int128& operator += (const Int128 &rhs)
+    {
+      hi += rhs.hi;
+      lo += rhs.lo;
+      if (lo < rhs.lo) hi++;
+      return *this;
+    }
+
+    Int128 operator + (const Int128 &rhs) const
+    {
+      Int128 result(*this);
+      result+= rhs;
+      return result;
+    }
+
+    Int128& operator -= (const Int128 &rhs)
+    {
+      *this += -rhs;
+      return *this;
+    }
+
+    Int128 operator - (const Int128 &rhs) const
+    {
+      Int128 result(*this);
+      result -= rhs;
+      return result;
+    }
+
+    Int128 operator-() const //unary negation
+    {
+      if (lo == 0)
+        return Int128(-hi, 0);
+      else
+        return Int128(~hi, ~lo + 1);
+    }
+
+    operator double() const
+    {
+      const double shift64 = 18446744073709551616.0; //2^64
+      if (hi < 0)
+      {
+        if (lo == 0) return (double)hi * shift64;
+        else return -(double)(~lo + ~hi * shift64);
+      }
+      else
+        return (double)(lo + hi * shift64);
+    }
+
+};
+//------------------------------------------------------------------------------
+
+Int128 Int128Mul (long64 lhs, long64 rhs)
+{
+  bool negate = (lhs < 0) != (rhs < 0);
+
+  if (lhs < 0) lhs = -lhs;
+  ulong64 int1Hi = ulong64(lhs) >> 32;
+  ulong64 int1Lo = ulong64(lhs & 0xFFFFFFFF);
+
+  if (rhs < 0) rhs = -rhs;
+  ulong64 int2Hi = ulong64(rhs) >> 32;
+  ulong64 int2Lo = ulong64(rhs & 0xFFFFFFFF);
+
+  //nb: see comments in clipper.pas
+  ulong64 a = int1Hi * int2Hi;
+  ulong64 b = int1Lo * int2Lo;
+  ulong64 c = int1Hi * int2Lo + int1Lo * int2Hi;
+
+  Int128 tmp;
+  tmp.hi = long64(a + (c >> 32));
+  tmp.lo = long64(c << 32);
+  tmp.lo += long64(b);
+  if (tmp.lo < b) tmp.hi++;
+  if (negate) tmp = -tmp;
+  return tmp;
+};
+#endif
+
+//------------------------------------------------------------------------------
+// Miscellaneous global functions
+//------------------------------------------------------------------------------
+
+bool Orientation(const Path &poly)
+{
+    return Area(poly) >= 0;
+}
+//------------------------------------------------------------------------------
+
+double Area(const Path &poly)
+{
+  int size = (int)poly.size();
+  if (size < 3) return 0;
+
+  double a = 0;
+  for (int i = 0, j = size -1; i < size; ++i)
+  {
+    a += ((double)poly[j].X + poly[i].X) * ((double)poly[j].Y - poly[i].Y);
+    j = i;
+  }
+  return -a * 0.5;
+}
+//------------------------------------------------------------------------------
+
+double Area(const OutRec &outRec)
+{
+  OutPt *op = outRec.Pts;
+  if (!op) return 0;
+  double a = 0;
+  do {
+    a +=  (double)(op->Prev->Pt.X + op->Pt.X) * (double)(op->Prev->Pt.Y - op->Pt.Y);
+    op = op->Next;
+  } while (op != outRec.Pts);
+  return a * 0.5;
+}
+//------------------------------------------------------------------------------
+
+bool PointIsVertex(const IntPoint &Pt, OutPt *pp)
+{
+  OutPt *pp2 = pp;
+  do
+  {
+    if (pp2->Pt == Pt) return true;
+    pp2 = pp2->Next;
+  }
+  while (pp2 != pp);
+  return false;
+}
+//------------------------------------------------------------------------------
+
+int PointInPolygon (const IntPoint &pt, const Path &path)
+{
+  //returns 0 if false, +1 if true, -1 if pt ON polygon boundary
+  //See "The Point in Polygon Problem for Arbitrary Polygons" by Hormann & Agathos
+  //http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.88.5498&rep=rep1&type=pdf
+  int result = 0;
+  size_t cnt = path.size();
+  if (cnt < 3) return 0;
+  IntPoint ip = path[0];
+  for(size_t i = 1; i <= cnt; ++i)
+  {
+    IntPoint ipNext = (i == cnt ? path[0] : path[i]);
+    if (ipNext.Y == pt.Y)
+    {
+        if ((ipNext.X == pt.X) || (ip.Y == pt.Y && 
+          ((ipNext.X > pt.X) == (ip.X < pt.X)))) return -1;
+    }
+    if ((ip.Y < pt.Y) != (ipNext.Y < pt.Y))
+    {
+      if (ip.X >= pt.X)
+      {
+        if (ipNext.X > pt.X) result = 1 - result;
+        else
+        {
+          double d = (double)(ip.X - pt.X) * (ipNext.Y - pt.Y) - 
+            (double)(ipNext.X - pt.X) * (ip.Y - pt.Y);
+          if (!d) return -1;
+          if ((d > 0) == (ipNext.Y > ip.Y)) result = 1 - result;
+        }
+      } else
+      {
+        if (ipNext.X > pt.X)
+        {
+          double d = (double)(ip.X - pt.X) * (ipNext.Y - pt.Y) - 
+            (double)(ipNext.X - pt.X) * (ip.Y - pt.Y);
+          if (!d) return -1;
+          if ((d > 0) == (ipNext.Y > ip.Y)) result = 1 - result;
+        }
+      }
+    }
+    ip = ipNext;
+  } 
+  return result;
+}
+//------------------------------------------------------------------------------
+
+int PointInPolygon (const IntPoint &pt, OutPt *op)
+{
+  //returns 0 if false, +1 if true, -1 if pt ON polygon boundary
+  int result = 0;
+  OutPt* startOp = op;
+  for(;;)
+  {
+    if (op->Next->Pt.Y == pt.Y)
+    {
+        if ((op->Next->Pt.X == pt.X) || (op->Pt.Y == pt.Y && 
+          ((op->Next->Pt.X > pt.X) == (op->Pt.X < pt.X)))) return -1;
+    }
+    if ((op->Pt.Y < pt.Y) != (op->Next->Pt.Y < pt.Y))
+    {
+      if (op->Pt.X >= pt.X)
+      {
+        if (op->Next->Pt.X > pt.X) result = 1 - result;
+        else
+        {
+          double d = (double)(op->Pt.X - pt.X) * (op->Next->Pt.Y - pt.Y) - 
+            (double)(op->Next->Pt.X - pt.X) * (op->Pt.Y - pt.Y);
+          if (!d) return -1;
+          if ((d > 0) == (op->Next->Pt.Y > op->Pt.Y)) result = 1 - result;
+        }
+      } else
+      {
+        if (op->Next->Pt.X > pt.X)
+        {
+          double d = (double)(op->Pt.X - pt.X) * (op->Next->Pt.Y - pt.Y) - 
+            (double)(op->Next->Pt.X - pt.X) * (op->Pt.Y - pt.Y);
+          if (!d) return -1;
+          if ((d > 0) == (op->Next->Pt.Y > op->Pt.Y)) result = 1 - result;
+        }
+      }
+    } 
+    op = op->Next;
+    if (startOp == op) break;
+  } 
+  return result;
+}
+//------------------------------------------------------------------------------
+
+bool Poly2ContainsPoly1(OutPt *OutPt1, OutPt *OutPt2)
+{
+  OutPt* op = OutPt1;
+  do
+  {
+    //nb: PointInPolygon returns 0 if false, +1 if true, -1 if pt on polygon
+    int res = PointInPolygon(op->Pt, OutPt2);
+    if (res >= 0) return res > 0;
+    op = op->Next; 
+  }
+  while (op != OutPt1);
+  return true; 
+}
+//----------------------------------------------------------------------
+
+bool SlopesEqual(const TEdge &e1, const TEdge &e2, bool UseFullInt64Range)
+{
+#ifndef use_int32
+  if (UseFullInt64Range)
+    return Int128Mul(e1.Delta.Y, e2.Delta.X) == Int128Mul(e1.Delta.X, e2.Delta.Y);
+  else 
+#endif
+    return e1.Delta.Y * e2.Delta.X == e1.Delta.X * e2.Delta.Y;
+}
+//------------------------------------------------------------------------------
+
+bool SlopesEqual(const IntPoint pt1, const IntPoint pt2,
+  const IntPoint pt3, bool UseFullInt64Range)
+{
+#ifndef use_int32
+  if (UseFullInt64Range)
+    return Int128Mul(pt1.Y-pt2.Y, pt2.X-pt3.X) == Int128Mul(pt1.X-pt2.X, pt2.Y-pt3.Y);
+  else 
+#endif
+    return (pt1.Y-pt2.Y)*(pt2.X-pt3.X) == (pt1.X-pt2.X)*(pt2.Y-pt3.Y);
+}
+//------------------------------------------------------------------------------
+
+bool SlopesEqual(const IntPoint pt1, const IntPoint pt2,
+  const IntPoint pt3, const IntPoint pt4, bool UseFullInt64Range)
+{
+#ifndef use_int32
+  if (UseFullInt64Range)
+    return Int128Mul(pt1.Y-pt2.Y, pt3.X-pt4.X) == Int128Mul(pt1.X-pt2.X, pt3.Y-pt4.Y);
+  else 
+#endif
+    return (pt1.Y-pt2.Y)*(pt3.X-pt4.X) == (pt1.X-pt2.X)*(pt3.Y-pt4.Y);
+}
+//------------------------------------------------------------------------------
+
+inline bool IsHorizontal(TEdge &e)
+{
+  return e.Delta.Y == 0;
+}
+//------------------------------------------------------------------------------
+
+inline double GetDx(const IntPoint pt1, const IntPoint pt2)
+{
+  return (pt1.Y == pt2.Y) ?
+    HORIZONTAL : (double)(pt2.X - pt1.X) / (pt2.Y - pt1.Y);
+}
+//---------------------------------------------------------------------------
+
+inline void SetDx(TEdge &e)
+{
+  e.Delta.X = (e.Top.X - e.Bot.X);
+  e.Delta.Y = (e.Top.Y - e.Bot.Y);
+
+  if (e.Delta.Y == 0) e.Dx = HORIZONTAL;
+  else e.Dx = (double)(e.Delta.X) / e.Delta.Y;
+}
+//---------------------------------------------------------------------------
+
+inline void SwapSides(TEdge &Edge1, TEdge &Edge2)
+{
+  EdgeSide Side =  Edge1.Side;
+  Edge1.Side = Edge2.Side;
+  Edge2.Side = Side;
+}
+//------------------------------------------------------------------------------
+
+inline void SwapPolyIndexes(TEdge &Edge1, TEdge &Edge2)
+{
+  int OutIdx =  Edge1.OutIdx;
+  Edge1.OutIdx = Edge2.OutIdx;
+  Edge2.OutIdx = OutIdx;
+}
+//------------------------------------------------------------------------------
+
+inline cInt TopX(TEdge &edge, const cInt currentY)
+{
+  return ( currentY == edge.Top.Y ) ?
+    edge.Top.X : edge.Bot.X + Round(edge.Dx *(currentY - edge.Bot.Y));
+}
+//------------------------------------------------------------------------------
+
+void IntersectPoint(TEdge &Edge1, TEdge &Edge2, IntPoint &ip)
+{
+#ifdef use_xyz  
+  ip.Z = 0;
+#endif
+
+  double b1, b2;
+  if (Edge1.Dx == Edge2.Dx)
+  {
+    ip.Y = Edge1.Curr.Y;
+    ip.X = TopX(Edge1, ip.Y);
+    return;
+  }
+  else if (Edge1.Delta.X == 0)
+  {
+    ip.X = Edge1.Bot.X;
+    if (IsHorizontal(Edge2))
+      ip.Y = Edge2.Bot.Y;
+    else
+    {
+      b2 = Edge2.Bot.Y - (Edge2.Bot.X / Edge2.Dx);
+      ip.Y = Round(ip.X / Edge2.Dx + b2);
+    }
+  }
+  else if (Edge2.Delta.X == 0)
+  {
+    ip.X = Edge2.Bot.X;
+    if (IsHorizontal(Edge1))
+      ip.Y = Edge1.Bot.Y;
+    else
+    {
+      b1 = Edge1.Bot.Y - (Edge1.Bot.X / Edge1.Dx);
+      ip.Y = Round(ip.X / Edge1.Dx + b1);
+    }
+  } 
+  else 
+  {
+    b1 = Edge1.Bot.X - Edge1.Bot.Y * Edge1.Dx;
+    b2 = Edge2.Bot.X - Edge2.Bot.Y * Edge2.Dx;
+    double q = (b2-b1) / (Edge1.Dx - Edge2.Dx);
+    ip.Y = Round(q);
+    if (std::fabs(Edge1.Dx) < std::fabs(Edge2.Dx))
+      ip.X = Round(Edge1.Dx * q + b1);
+    else 
+      ip.X = Round(Edge2.Dx * q + b2);
+  }
+
+  if (ip.Y < Edge1.Top.Y || ip.Y < Edge2.Top.Y) 
+  {
+    if (Edge1.Top.Y > Edge2.Top.Y)
+      ip.Y = Edge1.Top.Y;
+    else
+      ip.Y = Edge2.Top.Y;
+    if (std::fabs(Edge1.Dx) < std::fabs(Edge2.Dx))
+      ip.X = TopX(Edge1, ip.Y);
+    else
+      ip.X = TopX(Edge2, ip.Y);
+  } 
+  //finally, don't allow 'ip' to be BELOW curr.Y (ie bottom of scanbeam) ...
+  if (ip.Y > Edge1.Curr.Y)
+  {
+    ip.Y = Edge1.Curr.Y;
+    //use the more vertical edge to derive X ...
+    if (std::fabs(Edge1.Dx) > std::fabs(Edge2.Dx))
+      ip.X = TopX(Edge2, ip.Y); else
+      ip.X = TopX(Edge1, ip.Y);
+  }
+}
+//------------------------------------------------------------------------------
+
+void ReversePolyPtLinks(OutPt *pp)
+{
+  if (!pp) return;
+  OutPt *pp1, *pp2;
+  pp1 = pp;
+  do {
+  pp2 = pp1->Next;
+  pp1->Next = pp1->Prev;
+  pp1->Prev = pp2;
+  pp1 = pp2;
+  } while( pp1 != pp );
+}
+//------------------------------------------------------------------------------
+
+void DisposeOutPts(OutPt*& pp)
+{
+  if (pp == 0) return;
+    pp->Prev->Next = 0;
+  while( pp )
+  {
+    OutPt *tmpPp = pp;
+    pp = pp->Next;
+    delete tmpPp;
+  }
+}
+//------------------------------------------------------------------------------
+
+inline void InitEdge(TEdge* e, TEdge* eNext, TEdge* ePrev, const IntPoint& Pt)
+{
+  std::memset(e, 0, sizeof(TEdge));
+  e->Next = eNext;
+  e->Prev = ePrev;
+  e->Curr = Pt;
+  e->OutIdx = Unassigned;
+}
+//------------------------------------------------------------------------------
+
+void InitEdge2(TEdge& e, PolyType Pt)
+{
+  if (e.Curr.Y >= e.Next->Curr.Y)
+  {
+    e.Bot = e.Curr;
+    e.Top = e.Next->Curr;
+  } else
+  {
+    e.Top = e.Curr;
+    e.Bot = e.Next->Curr;
+  }
+  SetDx(e);
+  e.PolyTyp = Pt;
+}
+//------------------------------------------------------------------------------
+
+TEdge* RemoveEdge(TEdge* e)
+{
+  //removes e from double_linked_list (but without removing from memory)
+  e->Prev->Next = e->Next;
+  e->Next->Prev = e->Prev;
+  TEdge* result = e->Next;
+  e->Prev = 0; //flag as removed (see ClipperBase.Clear)
+  return result;
+}
+//------------------------------------------------------------------------------
+
+inline void ReverseHorizontal(TEdge &e)
+{
+  //swap horizontal edges' Top and Bottom x's so they follow the natural
+  //progression of the bounds - ie so their xbots will align with the
+  //adjoining lower edge. [Helpful in the ProcessHorizontal() method.]
+  std::swap(e.Top.X, e.Bot.X);
+#ifdef use_xyz
+  std::swap(e.Top.Z, e.Bot.Z);
+#endif
+}
+//------------------------------------------------------------------------------
+
+void SwapPoints(IntPoint &pt1, IntPoint &pt2)
+{
+  IntPoint tmp = pt1;
+  pt1 = pt2;
+  pt2 = tmp;
+}
+//------------------------------------------------------------------------------
+
+bool GetOverlapSegment(IntPoint pt1a, IntPoint pt1b, IntPoint pt2a,
+  IntPoint pt2b, IntPoint &pt1, IntPoint &pt2)
+{
+  //precondition: segments are Collinear.
+  if (Abs(pt1a.X - pt1b.X) > Abs(pt1a.Y - pt1b.Y))
+  {
+    if (pt1a.X > pt1b.X) SwapPoints(pt1a, pt1b);
+    if (pt2a.X > pt2b.X) SwapPoints(pt2a, pt2b);
+    if (pt1a.X > pt2a.X) pt1 = pt1a; else pt1 = pt2a;
+    if (pt1b.X < pt2b.X) pt2 = pt1b; else pt2 = pt2b;
+    return pt1.X < pt2.X;
+  } else
+  {
+    if (pt1a.Y < pt1b.Y) SwapPoints(pt1a, pt1b);
+    if (pt2a.Y < pt2b.Y) SwapPoints(pt2a, pt2b);
+    if (pt1a.Y < pt2a.Y) pt1 = pt1a; else pt1 = pt2a;
+    if (pt1b.Y > pt2b.Y) pt2 = pt1b; else pt2 = pt2b;
+    return pt1.Y > pt2.Y;
+  }
+}
+//------------------------------------------------------------------------------
+
+bool FirstIsBottomPt(const OutPt* btmPt1, const OutPt* btmPt2)
+{
+  OutPt *p = btmPt1->Prev;
+  while ((p->Pt == btmPt1->Pt) && (p != btmPt1)) p = p->Prev;
+  double dx1p = std::fabs(GetDx(btmPt1->Pt, p->Pt));
+  p = btmPt1->Next;
+  while ((p->Pt == btmPt1->Pt) && (p != btmPt1)) p = p->Next;
+  double dx1n = std::fabs(GetDx(btmPt1->Pt, p->Pt));
+
+  p = btmPt2->Prev;
+  while ((p->Pt == btmPt2->Pt) && (p != btmPt2)) p = p->Prev;
+  double dx2p = std::fabs(GetDx(btmPt2->Pt, p->Pt));
+  p = btmPt2->Next;
+  while ((p->Pt == btmPt2->Pt) && (p != btmPt2)) p = p->Next;
+  double dx2n = std::fabs(GetDx(btmPt2->Pt, p->Pt));
+  return (dx1p >= dx2p && dx1p >= dx2n) || (dx1n >= dx2p && dx1n >= dx2n);
+}
+//------------------------------------------------------------------------------
+
+OutPt* GetBottomPt(OutPt *pp)
+{
+  OutPt* dups = 0;
+  OutPt* p = pp->Next;
+  while (p != pp)
+  {
+    if (p->Pt.Y > pp->Pt.Y)
+    {
+      pp = p;
+      dups = 0;
+    }
+    else if (p->Pt.Y == pp->Pt.Y && p->Pt.X <= pp->Pt.X)
+    {
+      if (p->Pt.X < pp->Pt.X)
+      {
+        dups = 0;
+        pp = p;
+      } else
+      {
+        if (p->Next != pp && p->Prev != pp) dups = p;
+      }
+    }
+    p = p->Next;
+  }
+  if (dups)
+  {
+    //there appears to be at least 2 vertices at BottomPt so ...
+    while (dups != p)
+    {
+      if (!FirstIsBottomPt(p, dups)) pp = dups;
+      dups = dups->Next;
+      while (dups->Pt != pp->Pt) dups = dups->Next;
+    }
+  }
+  return pp;
+}
+//------------------------------------------------------------------------------
+
+bool Pt2IsBetweenPt1AndPt3(const IntPoint pt1,
+  const IntPoint pt2, const IntPoint pt3)
+{
+  if ((pt1 == pt3) || (pt1 == pt2) || (pt3 == pt2))
+    return false;
+  else if (pt1.X != pt3.X)
+    return (pt2.X > pt1.X) == (pt2.X < pt3.X);
+  else
+    return (pt2.Y > pt1.Y) == (pt2.Y < pt3.Y);
+}
+//------------------------------------------------------------------------------
+
+bool HorzSegmentsOverlap(cInt seg1a, cInt seg1b, cInt seg2a, cInt seg2b)
+{
+  if (seg1a > seg1b) std::swap(seg1a, seg1b);
+  if (seg2a > seg2b) std::swap(seg2a, seg2b);
+  return (seg1a < seg2b) && (seg2a < seg1b);
+}
+
+//------------------------------------------------------------------------------
+// ClipperBase class methods ...
+//------------------------------------------------------------------------------
+
+ClipperBase::ClipperBase() //constructor
+{
+  m_CurrentLM = m_MinimaList.begin(); //begin() == end() here
+  m_UseFullRange = false;
+}
+//------------------------------------------------------------------------------
+
+ClipperBase::~ClipperBase() //destructor
+{
+  Clear();
+}
+//------------------------------------------------------------------------------
+
+void RangeTest(const IntPoint& Pt, bool& useFullRange)
+{
+  if (useFullRange)
+  {
+    if (Pt.X > hiRange || Pt.Y > hiRange || -Pt.X > hiRange || -Pt.Y > hiRange) 
+      throw "Coordinate outside allowed range";
+  }
+  else if (Pt.X > loRange|| Pt.Y > loRange || -Pt.X > loRange || -Pt.Y > loRange) 
+  {
+    useFullRange = true;
+    RangeTest(Pt, useFullRange);
+  }
+}
+//------------------------------------------------------------------------------
+
+TEdge* FindNextLocMin(TEdge* E)
+{
+  for (;;)
+  {
+    while (E->Bot != E->Prev->Bot || E->Curr == E->Top) E = E->Next;
+    if (!IsHorizontal(*E) && !IsHorizontal(*E->Prev)) break;
+    while (IsHorizontal(*E->Prev)) E = E->Prev;
+    TEdge* E2 = E;
+    while (IsHorizontal(*E)) E = E->Next;
+    if (E->Top.Y == E->Prev->Bot.Y) continue; //ie just an intermediate horz.
+    if (E2->Prev->Bot.X < E->Bot.X) E = E2;
+    break;
+  }
+  return E;
+}
+//------------------------------------------------------------------------------
+
+TEdge* ClipperBase::ProcessBound(TEdge* E, bool NextIsForward)
+{
+  TEdge *Result = E;
+  TEdge *Horz = 0;
+
+  if (E->OutIdx == Skip)
+  {
+    //if edges still remain in the current bound beyond the skip edge then
+    //create another LocMin and call ProcessBound once more
+    if (NextIsForward)
+    {
+      while (E->Top.Y == E->Next->Bot.Y) E = E->Next;
+      //don't include top horizontals when parsing a bound a second time,
+      //they will be contained in the opposite bound ...
+      while (E != Result && IsHorizontal(*E)) E = E->Prev;
+    }
+    else
+    {
+      while (E->Top.Y == E->Prev->Bot.Y) E = E->Prev;
+      while (E != Result && IsHorizontal(*E)) E = E->Next;
+    }
+
+    if (E == Result)
+    {
+      if (NextIsForward) Result = E->Next;
+      else Result = E->Prev;
+    }
+    else
+    {
+      //there are more edges in the bound beyond result starting with E
+      if (NextIsForward)
+        E = Result->Next;
+      else
+        E = Result->Prev;
+      MinimaList::value_type locMin;
+      locMin.Y = E->Bot.Y;
+      locMin.LeftBound = 0;
+      locMin.RightBound = E;
+      E->WindDelta = 0;
+      Result = ProcessBound(E, NextIsForward);
+      m_MinimaList.push_back(locMin);
+    }
+    return Result;
+  }
+
+  TEdge *EStart;
+
+  if (IsHorizontal(*E))
+  {
+    //We need to be careful with open paths because this may not be a
+    //true local minima (ie E may be following a skip edge).
+    //Also, consecutive horz. edges may start heading left before going right.
+    if (NextIsForward) 
+      EStart = E->Prev;
+    else 
+      EStart = E->Next;
+    if (IsHorizontal(*EStart)) //ie an adjoining horizontal skip edge
+    {
+      if (EStart->Bot.X != E->Bot.X && EStart->Top.X != E->Bot.X) 
+        ReverseHorizontal(*E);
+    }
+    else if (EStart->Bot.X != E->Bot.X) 
+      ReverseHorizontal(*E);
+  }
+  
+  EStart = E;
+  if (NextIsForward)
+  {
+    while (Result->Top.Y == Result->Next->Bot.Y && Result->Next->OutIdx != Skip)
+      Result = Result->Next;
+    if (IsHorizontal(*Result) && Result->Next->OutIdx != Skip)
+    {
+      //nb: at the top of a bound, horizontals are added to the bound
+      //only when the preceding edge attaches to the horizontal's left vertex
+      //unless a Skip edge is encountered when that becomes the top divide
+      Horz = Result;
+      while (IsHorizontal(*Horz->Prev)) Horz = Horz->Prev;
+      if (Horz->Prev->Top.X == Result->Next->Top.X) 
+      {
+        if (!NextIsForward) Result = Horz->Prev;
+      }
+      else if (Horz->Prev->Top.X > Result->Next->Top.X) Result = Horz->Prev;
+    }
+    while (E != Result) 
+    {
+      E->NextInLML = E->Next;
+      if (IsHorizontal(*E) && E != EStart &&
+        E->Bot.X != E->Prev->Top.X) ReverseHorizontal(*E);
+      E = E->Next;
+    }
+    if (IsHorizontal(*E) && E != EStart && E->Bot.X != E->Prev->Top.X) 
+      ReverseHorizontal(*E);
+    Result = Result->Next; //move to the edge just beyond current bound
+  } else
+  {
+    while (Result->Top.Y == Result->Prev->Bot.Y && Result->Prev->OutIdx != Skip) 
+      Result = Result->Prev;
+    if (IsHorizontal(*Result) && Result->Prev->OutIdx != Skip)
+    {
+      Horz = Result;
+      while (IsHorizontal(*Horz->Next)) Horz = Horz->Next;
+      if (Horz->Next->Top.X == Result->Prev->Top.X) 
+      {
+        if (!NextIsForward) Result = Horz->Next;
+      }
+      else if (Horz->Next->Top.X > Result->Prev->Top.X) Result = Horz->Next;
+    }
+
+    while (E != Result)
+    {
+      E->NextInLML = E->Prev;
+      if (IsHorizontal(*E) && E != EStart && E->Bot.X != E->Next->Top.X) 
+        ReverseHorizontal(*E);
+      E = E->Prev;
+    }
+    if (IsHorizontal(*E) && E != EStart && E->Bot.X != E->Next->Top.X) 
+      ReverseHorizontal(*E);
+    Result = Result->Prev; //move to the edge just beyond current bound
+  }
+
+  return Result;
+}
+//------------------------------------------------------------------------------
+
+bool ClipperBase::AddPath(const Path &pg, PolyType PolyTyp, bool Closed)
+{
+#ifdef use_lines
+  if (!Closed && PolyTyp == ptClip)
+    throw clipperException("AddPath: Open paths must be subject.");
+#else
+  if (!Closed)
+    throw clipperException("AddPath: Open paths have been disabled.");
+#endif
+
+  int highI = (int)pg.size() -1;
+  if (Closed) while (highI > 0 && (pg[highI] == pg[0])) --highI;
+  while (highI > 0 && (pg[highI] == pg[highI -1])) --highI;
+  if ((Closed && highI < 2) || (!Closed && highI < 1)) return false;
+
+  //create a new edge array ...
+  TEdge *edges = new TEdge [highI +1];
+
+  bool IsFlat = true;
+  //1. Basic (first) edge initialization ...
+  try
+  {
+    edges[1].Curr = pg[1];
+    RangeTest(pg[0], m_UseFullRange);
+    RangeTest(pg[highI], m_UseFullRange);
+    InitEdge(&edges[0], &edges[1], &edges[highI], pg[0]);
+    InitEdge(&edges[highI], &edges[0], &edges[highI-1], pg[highI]);
+    for (int i = highI - 1; i >= 1; --i)
+    {
+      RangeTest(pg[i], m_UseFullRange);
+      InitEdge(&edges[i], &edges[i+1], &edges[i-1], pg[i]);
+    }
+  }
+  catch(...)
+  {
+    delete [] edges;
+    throw; //range test fails
+  }
+  TEdge *eStart = &edges[0];
+
+  //2. Remove duplicate vertices, and (when closed) collinear edges ...
+  TEdge *E = eStart, *eLoopStop = eStart;
+  for (;;)
+  {
+    //nb: allows matching start and end points when not Closed ...
+    if (E->Curr == E->Next->Curr && (Closed || E->Next != eStart))
+    {
+      if (E == E->Next) break;
+      if (E == eStart) eStart = E->Next;
+      E = RemoveEdge(E);
+      eLoopStop = E;
+      continue;
+    }
+    if (E->Prev == E->Next) 
+      break; //only two vertices
+    else if (Closed &&
+      SlopesEqual(E->Prev->Curr, E->Curr, E->Next->Curr, m_UseFullRange) && 
+      (!m_PreserveCollinear ||
+      !Pt2IsBetweenPt1AndPt3(E->Prev->Curr, E->Curr, E->Next->Curr)))
+    {
+      //Collinear edges are allowed for open paths but in closed paths
+      //the default is to merge adjacent collinear edges into a single edge.
+      //However, if the PreserveCollinear property is enabled, only overlapping
+      //collinear edges (ie spikes) will be removed from closed paths.
+      if (E == eStart) eStart = E->Next;
+      E = RemoveEdge(E);
+      E = E->Prev;
+      eLoopStop = E;
+      continue;
+    }
+    E = E->Next;
+    if ((E == eLoopStop) || (!Closed && E->Next == eStart)) break;
+  }
+
+  if ((!Closed && (E == E->Next)) || (Closed && (E->Prev == E->Next)))
+  {
+    delete [] edges;
+    return false;
+  }
+
+  if (!Closed)
+  { 
+    m_HasOpenPaths = true;
+    eStart->Prev->OutIdx = Skip;
+  }
+
+  //3. Do second stage of edge initialization ...
+  E = eStart;
+  do
+  {
+    InitEdge2(*E, PolyTyp);
+    E = E->Next;
+    if (IsFlat && E->Curr.Y != eStart->Curr.Y) IsFlat = false;
+  }
+  while (E != eStart);
+
+  //4. Finally, add edge bounds to LocalMinima list ...
+
+  //Totally flat paths must be handled differently when adding them
+  //to LocalMinima list to avoid endless loops etc ...
+  if (IsFlat) 
+  {
+    if (Closed) 
+    {
+      delete [] edges;
+      return false;
+    }
+    E->Prev->OutIdx = Skip;
+    if (E->Prev->Bot.X < E->Prev->Top.X) ReverseHorizontal(*E->Prev);
+    MinimaList::value_type locMin;
+    locMin.Y = E->Bot.Y;
+    locMin.LeftBound = 0;
+    locMin.RightBound = E;
+    locMin.RightBound->Side = esRight;
+    locMin.RightBound->WindDelta = 0;
+    while (E->Next->OutIdx != Skip)
+    {
+      E->NextInLML = E->Next;
+      if (E->Bot.X != E->Prev->Top.X) ReverseHorizontal(*E);
+      E = E->Next;
+    }
+    m_MinimaList.push_back(locMin);
+    m_edges.push_back(edges);
+	  return true;
+  }
+
+  m_edges.push_back(edges);
+  bool leftBoundIsForward;
+  TEdge* EMin = 0;
+
+  //workaround to avoid an endless loop in the while loop below when
+  //open paths have matching start and end points ...
+  if (E->Prev->Bot == E->Prev->Top) E = E->Next;
+
+  for (;;)
+  {
+    E = FindNextLocMin(E);
+    if (E == EMin) break;
+    else if (!EMin) EMin = E;
+
+    //E and E.Prev now share a local minima (left aligned if horizontal).
+    //Compare their slopes to find which starts which bound ...
+    MinimaList::value_type locMin;
+    locMin.Y = E->Bot.Y;
+    if (E->Dx < E->Prev->Dx) 
+    {
+      locMin.LeftBound = E->Prev;
+      locMin.RightBound = E;
+      leftBoundIsForward = false; //Q.nextInLML = Q.prev
+    } else
+    {
+      locMin.LeftBound = E;
+      locMin.RightBound = E->Prev;
+      leftBoundIsForward = true; //Q.nextInLML = Q.next
+    }
+    locMin.LeftBound->Side = esLeft;
+    locMin.RightBound->Side = esRight;
+
+    if (!Closed) locMin.LeftBound->WindDelta = 0;
+    else if (locMin.LeftBound->Next == locMin.RightBound)
+      locMin.LeftBound->WindDelta = -1;
+    else locMin.LeftBound->WindDelta = 1;
+    locMin.RightBound->WindDelta = -locMin.LeftBound->WindDelta;
+
+    E = ProcessBound(locMin.LeftBound, leftBoundIsForward);
+    if (E->OutIdx == Skip) E = ProcessBound(E, leftBoundIsForward);
+
+    TEdge* E2 = ProcessBound(locMin.RightBound, !leftBoundIsForward);
+    if (E2->OutIdx == Skip) E2 = ProcessBound(E2, !leftBoundIsForward);
+
+    if (locMin.LeftBound->OutIdx == Skip)
+      locMin.LeftBound = 0;
+    else if (locMin.RightBound->OutIdx == Skip)
+      locMin.RightBound = 0;
+    m_MinimaList.push_back(locMin);
+    if (!leftBoundIsForward) E = E2;
+  }
+  return true;
+}
+//------------------------------------------------------------------------------
+
+bool ClipperBase::AddPaths(const Paths &ppg, PolyType PolyTyp, bool Closed)
+{
+  bool result = false;
+  for (Paths::size_type i = 0; i < ppg.size(); ++i)
+    if (AddPath(ppg[i], PolyTyp, Closed)) result = true;
+  return result;
+}
+//------------------------------------------------------------------------------
+
+void ClipperBase::Clear()
+{
+  DisposeLocalMinimaList();
+  for (EdgeList::size_type i = 0; i < m_edges.size(); ++i)
+  {
+    //for each edge array in turn, find the first used edge and 
+    //check for and remove any hiddenPts in each edge in the array.
+    TEdge* edges = m_edges[i];
+    delete [] edges;
+  }
+  m_edges.clear();
+  m_UseFullRange = false;
+  m_HasOpenPaths = false;
+}
+//------------------------------------------------------------------------------
+
+void ClipperBase::Reset()
+{
+  m_CurrentLM = m_MinimaList.begin();
+  if (m_CurrentLM == m_MinimaList.end()) return; //ie nothing to process
+  std::sort(m_MinimaList.begin(), m_MinimaList.end(), LocMinSorter());
+
+  //reset all edges ...
+  for (MinimaList::iterator lm = m_MinimaList.begin(); lm != m_MinimaList.end(); ++lm)
+  {
+    TEdge* e = lm->LeftBound;
+    if (e)
+    {
+      e->Curr = e->Bot;
+      e->Side = esLeft;
+      e->OutIdx = Unassigned;
+    }
+
+    e = lm->RightBound;
+    if (e)
+    {
+      e->Curr = e->Bot;
+      e->Side = esRight;
+      e->OutIdx = Unassigned;
+    }
+  }
+}
+//------------------------------------------------------------------------------
+
+void ClipperBase::DisposeLocalMinimaList()
+{
+  m_MinimaList.clear();
+  m_CurrentLM = m_MinimaList.begin();
+}
+//------------------------------------------------------------------------------
+
+void ClipperBase::PopLocalMinima()
+{
+  if (m_CurrentLM == m_MinimaList.end()) return;
+  ++m_CurrentLM;
+}
+//------------------------------------------------------------------------------
+
+IntRect ClipperBase::GetBounds()
+{
+  IntRect result;
+  MinimaList::iterator lm = m_MinimaList.begin();
+  if (lm == m_MinimaList.end())
+  {
+    result.left = result.top = result.right = result.bottom = 0;
+    return result;
+  }
+  result.left = lm->LeftBound->Bot.X;
+  result.top = lm->LeftBound->Bot.Y;
+  result.right = lm->LeftBound->Bot.X;
+  result.bottom = lm->LeftBound->Bot.Y;
+  while (lm != m_MinimaList.end())
+  {
+    result.bottom = std::max(result.bottom, lm->LeftBound->Bot.Y);
+    TEdge* e = lm->LeftBound;
+    for (;;) {
+      TEdge* bottomE = e;
+      while (e->NextInLML)
+      {
+        if (e->Bot.X < result.left) result.left = e->Bot.X;
+        if (e->Bot.X > result.right) result.right = e->Bot.X;
+        e = e->NextInLML;
+      }
+      result.left = std::min(result.left, e->Bot.X);
+      result.right = std::max(result.right, e->Bot.X);
+      result.left = std::min(result.left, e->Top.X);
+      result.right = std::max(result.right, e->Top.X);
+      result.top = std::min(result.top, e->Top.Y);
+      if (bottomE == lm->LeftBound) e = lm->RightBound;
+      else break;
+    }
+    ++lm;
+  }
+  return result;
+}
+
+//------------------------------------------------------------------------------
+// TClipper methods ...
+//------------------------------------------------------------------------------
+
+Clipper::Clipper(int initOptions) : ClipperBase() //constructor
+{
+  m_ActiveEdges = 0;
+  m_SortedEdges = 0;
+  m_ExecuteLocked = false;
+  m_UseFullRange = false;
+  m_ReverseOutput = ((initOptions & ioReverseSolution) != 0);
+  m_StrictSimple = ((initOptions & ioStrictlySimple) != 0);
+  m_PreserveCollinear = ((initOptions & ioPreserveCollinear) != 0);
+  m_HasOpenPaths = false;
+#ifdef use_xyz  
+  m_ZFill = 0;
+#endif
+}
+//------------------------------------------------------------------------------
+
+Clipper::~Clipper() //destructor
+{
+  Clear();
+}
+//------------------------------------------------------------------------------
+
+#ifdef use_xyz  
+void Clipper::ZFillFunction(TZFillCallback zFillFunc)
+{  
+  m_ZFill = zFillFunc;
+}
+//------------------------------------------------------------------------------
+#endif
+
+void Clipper::Reset()
+{
+  ClipperBase::Reset();
+  m_Scanbeam = ScanbeamList();
+  m_ActiveEdges = 0;
+  m_SortedEdges = 0;
+  for (MinimaList::iterator lm = m_MinimaList.begin(); lm != m_MinimaList.end(); ++lm)
+    InsertScanbeam(lm->Y);
+}
+//------------------------------------------------------------------------------
+
+bool Clipper::Execute(ClipType clipType, Paths &solution,
+    PolyFillType subjFillType, PolyFillType clipFillType)
+{
+  if( m_ExecuteLocked ) return false;
+  if (m_HasOpenPaths)
+    throw clipperException("Error: PolyTree struct is need for open path clipping.");
+  m_ExecuteLocked = true;
+  solution.resize(0);
+  m_SubjFillType = subjFillType;
+  m_ClipFillType = clipFillType;
+  m_ClipType = clipType;
+  m_UsingPolyTree = false;
+  bool succeeded = ExecuteInternal();
+  if (succeeded) BuildResult(solution);
+  DisposeAllOutRecs();
+  m_ExecuteLocked = false;
+  return succeeded;
+}
+//------------------------------------------------------------------------------
+
+bool Clipper::Execute(ClipType clipType, PolyTree& polytree,
+    PolyFillType subjFillType, PolyFillType clipFillType)
+{
+  if( m_ExecuteLocked ) return false;
+  m_ExecuteLocked = true;
+  m_SubjFillType = subjFillType;
+  m_ClipFillType = clipFillType;
+  m_ClipType = clipType;
+  m_UsingPolyTree = true;
+  bool succeeded = ExecuteInternal();
+  if (succeeded) BuildResult2(polytree);
+  DisposeAllOutRecs();
+  m_ExecuteLocked = false;
+  return succeeded;
+}
+//------------------------------------------------------------------------------
+
+void Clipper::FixHoleLinkage(OutRec &outrec)
+{
+  //skip OutRecs that (a) contain outermost polygons or
+  //(b) already have the correct owner/child linkage ...
+  if (!outrec.FirstLeft ||                
+      (outrec.IsHole != outrec.FirstLeft->IsHole &&
+      outrec.FirstLeft->Pts)) return;
+
+  OutRec* orfl = outrec.FirstLeft;
+  while (orfl && ((orfl->IsHole == outrec.IsHole) || !orfl->Pts))
+      orfl = orfl->FirstLeft;
+  outrec.FirstLeft = orfl;
+}
+//------------------------------------------------------------------------------
+
+bool Clipper::ExecuteInternal()
+{
+  bool succeeded = true;
+  try {
+    Reset();
+    if (m_CurrentLM == m_MinimaList.end()) return true;
+    cInt botY = PopScanbeam();
+    do {
+      InsertLocalMinimaIntoAEL(botY);
+      ClearGhostJoins();
+      ProcessHorizontals(false);
+      if (m_Scanbeam.empty()) break;
+      cInt topY = PopScanbeam();
+      succeeded = ProcessIntersections(botY, topY);
+      if (!succeeded) break;
+      ProcessEdgesAtTopOfScanbeam(topY);
+      botY = topY;
+    } while (!m_Scanbeam.empty() || m_CurrentLM != m_MinimaList.end());
+  }
+  catch(...) 
+  {
+    succeeded = false;
+  }
+
+  if (succeeded)
+  {
+    //fix orientations ...
+    for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
+    {
+      OutRec *outRec = m_PolyOuts[i];
+      if (!outRec->Pts || outRec->IsOpen) continue;
+      if ((outRec->IsHole ^ m_ReverseOutput) == (Area(*outRec) > 0))
+        ReversePolyPtLinks(outRec->Pts);
+    }
+
+    if (!m_Joins.empty()) JoinCommonEdges();
+
+    //unfortunately FixupOutPolygon() must be done after JoinCommonEdges()
+    for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
+    {
+      OutRec *outRec = m_PolyOuts[i];
+      if (outRec->Pts && !outRec->IsOpen)
+        FixupOutPolygon(*outRec);
+    }
+
+    if (m_StrictSimple) DoSimplePolygons();
+  }
+
+  ClearJoins();
+  ClearGhostJoins();
+  return succeeded;
+}
+//------------------------------------------------------------------------------
+
+void Clipper::InsertScanbeam(const cInt Y)
+{
+  //if (!m_Scanbeam.empty() && Y == m_Scanbeam.top()) return;// avoid duplicates.
+  m_Scanbeam.push(Y);
+}
+//------------------------------------------------------------------------------
+
+cInt Clipper::PopScanbeam()
+{
+  const cInt Y = m_Scanbeam.top();
+  m_Scanbeam.pop();
+  while (!m_Scanbeam.empty() && Y == m_Scanbeam.top()) { m_Scanbeam.pop(); } // Pop duplicates.
+  return Y;
+}
+//------------------------------------------------------------------------------
+
+void Clipper::DisposeAllOutRecs(){
+  for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
+    DisposeOutRec(i);
+  m_PolyOuts.clear();
+}
+//------------------------------------------------------------------------------
+
+void Clipper::DisposeOutRec(PolyOutList::size_type index)
+{
+  OutRec *outRec = m_PolyOuts[index];
+  if (outRec->Pts) DisposeOutPts(outRec->Pts);
+  delete outRec;
+  m_PolyOuts[index] = 0;
+}
+//------------------------------------------------------------------------------
+
+void Clipper::SetWindingCount(TEdge &edge)
+{
+  TEdge *e = edge.PrevInAEL;
+  //find the edge of the same polytype that immediately preceeds 'edge' in AEL
+  while (e  && ((e->PolyTyp != edge.PolyTyp) || (e->WindDelta == 0))) e = e->PrevInAEL;
+  if (!e)
+  {
+    edge.WindCnt = (edge.WindDelta == 0 ? 1 : edge.WindDelta);
+    edge.WindCnt2 = 0;
+    e = m_ActiveEdges; //ie get ready to calc WindCnt2
+  }   
+  else if (edge.WindDelta == 0 && m_ClipType != ctUnion)
+  {
+    edge.WindCnt = 1;
+    edge.WindCnt2 = e->WindCnt2;
+    e = e->NextInAEL; //ie get ready to calc WindCnt2
+  }
+  else if (IsEvenOddFillType(edge))
+  {
+    //EvenOdd filling ...
+    if (edge.WindDelta == 0)
+    {
+      //are we inside a subj polygon ...
+      bool Inside = true;
+      TEdge *e2 = e->PrevInAEL;
+      while (e2)
+      {
+        if (e2->PolyTyp == e->PolyTyp && e2->WindDelta != 0) 
+          Inside = !Inside;
+        e2 = e2->PrevInAEL;
+      }
+      edge.WindCnt = (Inside ? 0 : 1);
+    }
+    else
+    {
+      edge.WindCnt = edge.WindDelta;
+    }
+    edge.WindCnt2 = e->WindCnt2;
+    e = e->NextInAEL; //ie get ready to calc WindCnt2
+  } 
+  else
+  {
+    //nonZero, Positive or Negative filling ...
+    if (e->WindCnt * e->WindDelta < 0)
+    {
+      //prev edge is 'decreasing' WindCount (WC) toward zero
+      //so we're outside the previous polygon ...
+      if (Abs(e->WindCnt) > 1)
+      {
+        //outside prev poly but still inside another.
+        //when reversing direction of prev poly use the same WC 
+        if (e->WindDelta * edge.WindDelta < 0) edge.WindCnt = e->WindCnt;
+        //otherwise continue to 'decrease' WC ...
+        else edge.WindCnt = e->WindCnt + edge.WindDelta;
+      } 
+      else
+        //now outside all polys of same polytype so set own WC ...
+        edge.WindCnt = (edge.WindDelta == 0 ? 1 : edge.WindDelta);
+    } else
+    {
+      //prev edge is 'increasing' WindCount (WC) away from zero
+      //so we're inside the previous polygon ...
+      if (edge.WindDelta == 0) 
+        edge.WindCnt = (e->WindCnt < 0 ? e->WindCnt - 1 : e->WindCnt + 1);
+      //if wind direction is reversing prev then use same WC
+      else if (e->WindDelta * edge.WindDelta < 0) edge.WindCnt = e->WindCnt;
+      //otherwise add to WC ...
+      else edge.WindCnt = e->WindCnt + edge.WindDelta;
+    }
+    edge.WindCnt2 = e->WindCnt2;
+    e = e->NextInAEL; //ie get ready to calc WindCnt2
+  }
+
+  //update WindCnt2 ...
+  if (IsEvenOddAltFillType(edge))
+  {
+    //EvenOdd filling ...
+    while (e != &edge)
+    {
+      if (e->WindDelta != 0)
+        edge.WindCnt2 = (edge.WindCnt2 == 0 ? 1 : 0);
+      e = e->NextInAEL;
+    }
+  } else
+  {
+    //nonZero, Positive or Negative filling ...
+    while ( e != &edge )
+    {
+      edge.WindCnt2 += e->WindDelta;
+      e = e->NextInAEL;
+    }
+  }
+}
+//------------------------------------------------------------------------------
+
+bool Clipper::IsEvenOddFillType(const TEdge& edge) const
+{
+  if (edge.PolyTyp == ptSubject)
+    return m_SubjFillType == pftEvenOdd; else
+    return m_ClipFillType == pftEvenOdd;
+}
+//------------------------------------------------------------------------------
+
+bool Clipper::IsEvenOddAltFillType(const TEdge& edge) const
+{
+  if (edge.PolyTyp == ptSubject)
+    return m_ClipFillType == pftEvenOdd; else
+    return m_SubjFillType == pftEvenOdd;
+}
+//------------------------------------------------------------------------------
+
+bool Clipper::IsContributing(const TEdge& edge) const
+{
+  PolyFillType pft, pft2;
+  if (edge.PolyTyp == ptSubject)
+  {
+    pft = m_SubjFillType;
+    pft2 = m_ClipFillType;
+  } else
+  {
+    pft = m_ClipFillType;
+    pft2 = m_SubjFillType;
+  }
+
+  switch(pft)
+  {
+    case pftEvenOdd: 
+      //return false if a subj line has been flagged as inside a subj polygon
+      if (edge.WindDelta == 0 && edge.WindCnt != 1) return false;
+      break;
+    case pftNonZero:
+      if (Abs(edge.WindCnt) != 1) return false;
+      break;
+    case pftPositive: 
+      if (edge.WindCnt != 1) return false;
+      break;
+    default: //pftNegative
+      if (edge.WindCnt != -1) return false;
+  }
+
+  switch(m_ClipType)
+  {
+    case ctIntersection:
+      switch(pft2)
+      {
+        case pftEvenOdd: 
+        case pftNonZero: 
+          return (edge.WindCnt2 != 0);
+        case pftPositive: 
+          return (edge.WindCnt2 > 0);
+        default: 
+          return (edge.WindCnt2 < 0);
+      }
+      break;
+    case ctUnion:
+      switch(pft2)
+      {
+        case pftEvenOdd: 
+        case pftNonZero: 
+          return (edge.WindCnt2 == 0);
+        case pftPositive: 
+          return (edge.WindCnt2 <= 0);
+        default: 
+          return (edge.WindCnt2 >= 0);
+      }
+      break;
+    case ctDifference:
+      if (edge.PolyTyp == ptSubject)
+        switch(pft2)
+        {
+          case pftEvenOdd: 
+          case pftNonZero: 
+            return (edge.WindCnt2 == 0);
+          case pftPositive: 
+            return (edge.WindCnt2 <= 0);
+          default: 
+            return (edge.WindCnt2 >= 0);
+        }
+      else
+        switch(pft2)
+        {
+          case pftEvenOdd: 
+          case pftNonZero: 
+            return (edge.WindCnt2 != 0);
+          case pftPositive: 
+            return (edge.WindCnt2 > 0);
+          default: 
+            return (edge.WindCnt2 < 0);
+        }
+      break;
+    case ctXor:
+      if (edge.WindDelta == 0) //XOr always contributing unless open
+        switch(pft2)
+        {
+          case pftEvenOdd: 
+          case pftNonZero: 
+            return (edge.WindCnt2 == 0);
+          case pftPositive: 
+            return (edge.WindCnt2 <= 0);
+          default: 
+            return (edge.WindCnt2 >= 0);
+        }
+      else 
+        return true;
+      break;
+    default:
+      return true;
+  }
+}
+//------------------------------------------------------------------------------
+
+OutPt* Clipper::AddLocalMinPoly(TEdge *e1, TEdge *e2, const IntPoint &Pt)
+{
+  OutPt* result;
+  TEdge *e, *prevE;
+  if (IsHorizontal(*e2) || ( e1->Dx > e2->Dx ))
+  {
+    result = AddOutPt(e1, Pt);
+    e2->OutIdx = e1->OutIdx;
+    e1->Side = esLeft;
+    e2->Side = esRight;
+    e = e1;
+    if (e->PrevInAEL == e2)
+      prevE = e2->PrevInAEL; 
+    else
+      prevE = e->PrevInAEL;
+  } else
+  {
+    result = AddOutPt(e2, Pt);
+    e1->OutIdx = e2->OutIdx;
+    e1->Side = esRight;
+    e2->Side = esLeft;
+    e = e2;
+    if (e->PrevInAEL == e1)
+        prevE = e1->PrevInAEL;
+    else
+        prevE = e->PrevInAEL;
+  }
+
+  if (prevE && prevE->OutIdx >= 0 &&
+      (TopX(*prevE, Pt.Y) == TopX(*e, Pt.Y)) &&
+      SlopesEqual(*e, *prevE, m_UseFullRange) &&
+      (e->WindDelta != 0) && (prevE->WindDelta != 0))
+  {
+    OutPt* outPt = AddOutPt(prevE, Pt);
+    AddJoin(result, outPt, e->Top);
+  }
+  return result;
+}
+//------------------------------------------------------------------------------
+
+void Clipper::AddLocalMaxPoly(TEdge *e1, TEdge *e2, const IntPoint &Pt)
+{
+  AddOutPt( e1, Pt );
+  if (e2->WindDelta == 0) AddOutPt(e2, Pt);
+  if( e1->OutIdx == e2->OutIdx )
+  {
+    e1->OutIdx = Unassigned;
+    e2->OutIdx = Unassigned;
+  }
+  else if (e1->OutIdx < e2->OutIdx) 
+    AppendPolygon(e1, e2); 
+  else 
+    AppendPolygon(e2, e1);
+}
+//------------------------------------------------------------------------------
+
+void Clipper::AddEdgeToSEL(TEdge *edge)
+{
+  //SEL pointers in PEdge are reused to build a list of horizontal edges.
+  //However, we don't need to worry about order with horizontal edge processing.
+  if( !m_SortedEdges )
+  {
+    m_SortedEdges = edge;
+    edge->PrevInSEL = 0;
+    edge->NextInSEL = 0;
+  }
+  else
+  {
+    edge->NextInSEL = m_SortedEdges;
+    edge->PrevInSEL = 0;
+    m_SortedEdges->PrevInSEL = edge;
+    m_SortedEdges = edge;
+  }
+}
+//------------------------------------------------------------------------------
+
+void Clipper::CopyAELToSEL()
+{
+  TEdge* e = m_ActiveEdges;
+  m_SortedEdges = e;
+  while ( e )
+  {
+    e->PrevInSEL = e->PrevInAEL;
+    e->NextInSEL = e->NextInAEL;
+    e = e->NextInAEL;
+  }
+}
+//------------------------------------------------------------------------------
+
+void Clipper::AddJoin(OutPt *op1, OutPt *op2, const IntPoint OffPt)
+{
+  Join* j = new Join;
+  j->OutPt1 = op1;
+  j->OutPt2 = op2;
+  j->OffPt = OffPt;
+  m_Joins.push_back(j);
+}
+//------------------------------------------------------------------------------
+
+void Clipper::ClearJoins()
+{
+  for (JoinList::size_type i = 0; i < m_Joins.size(); i++)
+    delete m_Joins[i];
+  m_Joins.resize(0);
+}
+//------------------------------------------------------------------------------
+
+void Clipper::ClearGhostJoins()
+{
+  for (JoinList::size_type i = 0; i < m_GhostJoins.size(); i++)
+    delete m_GhostJoins[i];
+  m_GhostJoins.resize(0);
+}
+//------------------------------------------------------------------------------
+
+void Clipper::AddGhostJoin(OutPt *op, const IntPoint OffPt)
+{
+  Join* j = new Join;
+  j->OutPt1 = op;
+  j->OutPt2 = 0;
+  j->OffPt = OffPt;
+  m_GhostJoins.push_back(j);
+}
+//------------------------------------------------------------------------------
+
+void Clipper::InsertLocalMinimaIntoAEL(const cInt botY)
+{
+  while (m_CurrentLM != m_MinimaList.end() && (m_CurrentLM->Y == botY))
+  {
+    TEdge* lb = m_CurrentLM->LeftBound;
+    TEdge* rb = m_CurrentLM->RightBound;
+    PopLocalMinima();
+    OutPt *Op1 = 0;
+    if (!lb)
+    {
+      //nb: don't insert LB into either AEL or SEL
+      InsertEdgeIntoAEL(rb, 0);
+      SetWindingCount(*rb);
+      if (IsContributing(*rb))
+        Op1 = AddOutPt(rb, rb->Bot); 
+    } 
+    else if (!rb)
+    {
+      InsertEdgeIntoAEL(lb, 0);
+      SetWindingCount(*lb);
+      if (IsContributing(*lb))
+        Op1 = AddOutPt(lb, lb->Bot);
+      InsertScanbeam(lb->Top.Y);
+    }
+    else
+    {
+      InsertEdgeIntoAEL(lb, 0);
+      InsertEdgeIntoAEL(rb, lb);
+      SetWindingCount( *lb );
+      rb->WindCnt = lb->WindCnt;
+      rb->WindCnt2 = lb->WindCnt2;
+      if (IsContributing(*lb))
+        Op1 = AddLocalMinPoly(lb, rb, lb->Bot);      
+      InsertScanbeam(lb->Top.Y);
+    }
+
+     if (rb)
+     {
+       if(IsHorizontal(*rb)) AddEdgeToSEL(rb);
+       else InsertScanbeam( rb->Top.Y );
+     }
+
+    if (!lb || !rb) continue;
+
+    //if any output polygons share an edge, they'll need joining later ...
+    if (Op1 && IsHorizontal(*rb) && 
+      m_GhostJoins.size() > 0 && (rb->WindDelta != 0))
+    {
+      for (JoinList::size_type i = 0; i < m_GhostJoins.size(); ++i)
+      {
+        Join* jr = m_GhostJoins[i];
+        //if the horizontal Rb and a 'ghost' horizontal overlap, then convert
+        //the 'ghost' join to a real join ready for later ...
+        if (HorzSegmentsOverlap(jr->OutPt1->Pt.X, jr->OffPt.X, rb->Bot.X, rb->Top.X))
+          AddJoin(jr->OutPt1, Op1, jr->OffPt);
+      }
+    }
+
+    if (lb->OutIdx >= 0 && lb->PrevInAEL && 
+      lb->PrevInAEL->Curr.X == lb->Bot.X &&
+      lb->PrevInAEL->OutIdx >= 0 &&
+      SlopesEqual(*lb->PrevInAEL, *lb, m_UseFullRange) &&
+      (lb->WindDelta != 0) && (lb->PrevInAEL->WindDelta != 0))
+    {
+        OutPt *Op2 = AddOutPt(lb->PrevInAEL, lb->Bot);
+        AddJoin(Op1, Op2, lb->Top);
+    }
+
+    if(lb->NextInAEL != rb)
+    {
+
+      if (rb->OutIdx >= 0 && rb->PrevInAEL->OutIdx >= 0 &&
+        SlopesEqual(*rb->PrevInAEL, *rb, m_UseFullRange) &&
+        (rb->WindDelta != 0) && (rb->PrevInAEL->WindDelta != 0))
+      {
+          OutPt *Op2 = AddOutPt(rb->PrevInAEL, rb->Bot);
+          AddJoin(Op1, Op2, rb->Top);
+      }
+
+      TEdge* e = lb->NextInAEL;
+      if (e)
+      {
+        while( e != rb )
+        {
+          //nb: For calculating winding counts etc, IntersectEdges() assumes
+          //that param1 will be to the Right of param2 ABOVE the intersection ...
+          IntersectEdges(rb , e , lb->Curr); //order important here
+          e = e->NextInAEL;
+        }
+      }
+    }
+    
+  }
+}
+//------------------------------------------------------------------------------
+
+void Clipper::DeleteFromAEL(TEdge *e)
+{
+  TEdge* AelPrev = e->PrevInAEL;
+  TEdge* AelNext = e->NextInAEL;
+  if(  !AelPrev &&  !AelNext && (e != m_ActiveEdges) ) return; //already deleted
+  if( AelPrev ) AelPrev->NextInAEL = AelNext;
+  else m_ActiveEdges = AelNext;
+  if( AelNext ) AelNext->PrevInAEL = AelPrev;
+  e->NextInAEL = 0;
+  e->PrevInAEL = 0;
+}
+//------------------------------------------------------------------------------
+
+void Clipper::DeleteFromSEL(TEdge *e)
+{
+  TEdge* SelPrev = e->PrevInSEL;
+  TEdge* SelNext = e->NextInSEL;
+  if( !SelPrev &&  !SelNext && (e != m_SortedEdges) ) return; //already deleted
+  if( SelPrev ) SelPrev->NextInSEL = SelNext;
+  else m_SortedEdges = SelNext;
+  if( SelNext ) SelNext->PrevInSEL = SelPrev;
+  e->NextInSEL = 0;
+  e->PrevInSEL = 0;
+}
+//------------------------------------------------------------------------------
+
+#ifdef use_xyz
+void Clipper::SetZ(IntPoint& pt, TEdge& e1, TEdge& e2)
+{
+  if (pt.Z != 0 || !m_ZFill) return;
+  else if (pt == e1.Bot) pt.Z = e1.Bot.Z;
+  else if (pt == e1.Top) pt.Z = e1.Top.Z;
+  else if (pt == e2.Bot) pt.Z = e2.Bot.Z;
+  else if (pt == e2.Top) pt.Z = e2.Top.Z;
+  else (*m_ZFill)(e1.Bot, e1.Top, e2.Bot, e2.Top, pt); 
+}
+//------------------------------------------------------------------------------
+#endif
+
+void Clipper::IntersectEdges(TEdge *e1, TEdge *e2, IntPoint &Pt)
+{
+  bool e1Contributing = ( e1->OutIdx >= 0 );
+  bool e2Contributing = ( e2->OutIdx >= 0 );
+
+#ifdef use_xyz
+        SetZ(Pt, *e1, *e2);
+#endif
+
+#ifdef use_lines
+  //if either edge is on an OPEN path ...
+  if (e1->WindDelta == 0 || e2->WindDelta == 0)
+  {
+    //ignore subject-subject open path intersections UNLESS they
+    //are both open paths, AND they are both 'contributing maximas' ...
+	if (e1->WindDelta == 0 && e2->WindDelta == 0) return;
+
+    //if intersecting a subj line with a subj poly ...
+    else if (e1->PolyTyp == e2->PolyTyp && 
+      e1->WindDelta != e2->WindDelta && m_ClipType == ctUnion)
+    {
+      if (e1->WindDelta == 0)
+      {
+        if (e2Contributing)
+        {
+          AddOutPt(e1, Pt);
+          if (e1Contributing) e1->OutIdx = Unassigned;
+        }
+      }
+      else
+      {
+        if (e1Contributing)
+        {
+          AddOutPt(e2, Pt);
+          if (e2Contributing) e2->OutIdx = Unassigned;
+        }
+      }
+    }
+    else if (e1->PolyTyp != e2->PolyTyp)
+    {
+      //toggle subj open path OutIdx on/off when Abs(clip.WndCnt) == 1 ...
+      if ((e1->WindDelta == 0) && abs(e2->WindCnt) == 1 && 
+        (m_ClipType != ctUnion || e2->WindCnt2 == 0))
+      {
+        AddOutPt(e1, Pt);
+        if (e1Contributing) e1->OutIdx = Unassigned;
+      }
+      else if ((e2->WindDelta == 0) && (abs(e1->WindCnt) == 1) && 
+        (m_ClipType != ctUnion || e1->WindCnt2 == 0))
+      {
+        AddOutPt(e2, Pt);
+        if (e2Contributing) e2->OutIdx = Unassigned;
+      }
+    }
+    return;
+  }
+#endif
+
+  //update winding counts...
+  //assumes that e1 will be to the Right of e2 ABOVE the intersection
+  if ( e1->PolyTyp == e2->PolyTyp )
+  {
+    if ( IsEvenOddFillType( *e1) )
+    {
+      int oldE1WindCnt = e1->WindCnt;
+      e1->WindCnt = e2->WindCnt;
+      e2->WindCnt = oldE1WindCnt;
+    } else
+    {
+      if (e1->WindCnt + e2->WindDelta == 0 ) e1->WindCnt = -e1->WindCnt;
+      else e1->WindCnt += e2->WindDelta;
+      if ( e2->WindCnt - e1->WindDelta == 0 ) e2->WindCnt = -e2->WindCnt;
+      else e2->WindCnt -= e1->WindDelta;
+    }
+  } else
+  {
+    if (!IsEvenOddFillType(*e2)) e1->WindCnt2 += e2->WindDelta;
+    else e1->WindCnt2 = ( e1->WindCnt2 == 0 ) ? 1 : 0;
+    if (!IsEvenOddFillType(*e1)) e2->WindCnt2 -= e1->WindDelta;
+    else e2->WindCnt2 = ( e2->WindCnt2 == 0 ) ? 1 : 0;
+  }
+
+  PolyFillType e1FillType, e2FillType, e1FillType2, e2FillType2;
+  if (e1->PolyTyp == ptSubject)
+  {
+    e1FillType = m_SubjFillType;
+    e1FillType2 = m_ClipFillType;
+  } else
+  {
+    e1FillType = m_ClipFillType;
+    e1FillType2 = m_SubjFillType;
+  }
+  if (e2->PolyTyp == ptSubject)
+  {
+    e2FillType = m_SubjFillType;
+    e2FillType2 = m_ClipFillType;
+  } else
+  {
+    e2FillType = m_ClipFillType;
+    e2FillType2 = m_SubjFillType;
+  }
+
+  cInt e1Wc, e2Wc;
+  switch (e1FillType)
+  {
+    case pftPositive: e1Wc = e1->WindCnt; break;
+    case pftNegative: e1Wc = -e1->WindCnt; break;
+    default: e1Wc = Abs(e1->WindCnt);
+  }
+  switch(e2FillType)
+  {
+    case pftPositive: e2Wc = e2->WindCnt; break;
+    case pftNegative: e2Wc = -e2->WindCnt; break;
+    default: e2Wc = Abs(e2->WindCnt);
+  }
+
+  if ( e1Contributing && e2Contributing )
+  {
+    if ((e1Wc != 0 && e1Wc != 1) || (e2Wc != 0 && e2Wc != 1) ||
+      (e1->PolyTyp != e2->PolyTyp && m_ClipType != ctXor) )
+    {
+      AddLocalMaxPoly(e1, e2, Pt); 
+    }
+    else
+    {
+      AddOutPt(e1, Pt);
+      AddOutPt(e2, Pt);
+      SwapSides( *e1 , *e2 );
+      SwapPolyIndexes( *e1 , *e2 );
+    }
+  }
+  else if ( e1Contributing )
+  {
+    if (e2Wc == 0 || e2Wc == 1) 
+    {
+      AddOutPt(e1, Pt);
+      SwapSides(*e1, *e2);
+      SwapPolyIndexes(*e1, *e2);
+    }
+  }
+  else if ( e2Contributing )
+  {
+    if (e1Wc == 0 || e1Wc == 1) 
+    {
+      AddOutPt(e2, Pt);
+      SwapSides(*e1, *e2);
+      SwapPolyIndexes(*e1, *e2);
+    }
+  } 
+  else if ( (e1Wc == 0 || e1Wc == 1) && (e2Wc == 0 || e2Wc == 1))
+  {
+    //neither edge is currently contributing ...
+
+    cInt e1Wc2, e2Wc2;
+    switch (e1FillType2)
+    {
+      case pftPositive: e1Wc2 = e1->WindCnt2; break;
+      case pftNegative : e1Wc2 = -e1->WindCnt2; break;
+      default: e1Wc2 = Abs(e1->WindCnt2);
+    }
+    switch (e2FillType2)
+    {
+      case pftPositive: e2Wc2 = e2->WindCnt2; break;
+      case pftNegative: e2Wc2 = -e2->WindCnt2; break;
+      default: e2Wc2 = Abs(e2->WindCnt2);
+    }
+
+    if (e1->PolyTyp != e2->PolyTyp)
+    {
+      AddLocalMinPoly(e1, e2, Pt);
+    }
+    else if (e1Wc == 1 && e2Wc == 1)
+      switch( m_ClipType ) {
+        case ctIntersection:
+          if (e1Wc2 > 0 && e2Wc2 > 0)
+            AddLocalMinPoly(e1, e2, Pt);
+          break;
+        case ctUnion:
+          if ( e1Wc2 <= 0 && e2Wc2 <= 0 )
+            AddLocalMinPoly(e1, e2, Pt);
+          break;
+        case ctDifference:
+          if (((e1->PolyTyp == ptClip) && (e1Wc2 > 0) && (e2Wc2 > 0)) ||
+              ((e1->PolyTyp == ptSubject) && (e1Wc2 <= 0) && (e2Wc2 <= 0)))
+                AddLocalMinPoly(e1, e2, Pt);
+          break;
+        case ctXor:
+          AddLocalMinPoly(e1, e2, Pt);
+      }
+    else
+      SwapSides( *e1, *e2 );
+  }
+}
+//------------------------------------------------------------------------------
+
+void Clipper::SetHoleState(TEdge *e, OutRec *outrec)
+{
+  bool IsHole = false;
+  TEdge *e2 = e->PrevInAEL;
+  while (e2)
+  {
+    if (e2->OutIdx >= 0 && e2->WindDelta != 0)
+    {
+      IsHole = !IsHole;
+      if (! outrec->FirstLeft)
+        outrec->FirstLeft = m_PolyOuts[e2->OutIdx];
+    }
+    e2 = e2->PrevInAEL;
+  }
+  if (IsHole) outrec->IsHole = true;
+}
+//------------------------------------------------------------------------------
+
+OutRec* GetLowermostRec(OutRec *outRec1, OutRec *outRec2)
+{
+  //work out which polygon fragment has the correct hole state ...
+  if (!outRec1->BottomPt) 
+    outRec1->BottomPt = GetBottomPt(outRec1->Pts);
+  if (!outRec2->BottomPt) 
+    outRec2->BottomPt = GetBottomPt(outRec2->Pts);
+  OutPt *OutPt1 = outRec1->BottomPt;
+  OutPt *OutPt2 = outRec2->BottomPt;
+  if (OutPt1->Pt.Y > OutPt2->Pt.Y) return outRec1;
+  else if (OutPt1->Pt.Y < OutPt2->Pt.Y) return outRec2;
+  else if (OutPt1->Pt.X < OutPt2->Pt.X) return outRec1;
+  else if (OutPt1->Pt.X > OutPt2->Pt.X) return outRec2;
+  else if (OutPt1->Next == OutPt1) return outRec2;
+  else if (OutPt2->Next == OutPt2) return outRec1;
+  else if (FirstIsBottomPt(OutPt1, OutPt2)) return outRec1;
+  else return outRec2;
+}
+//------------------------------------------------------------------------------
+
+bool Param1RightOfParam2(OutRec* outRec1, OutRec* outRec2)
+{
+  do
+  {
+    outRec1 = outRec1->FirstLeft;
+    if (outRec1 == outRec2) return true;
+  } while (outRec1);
+  return false;
+}
+//------------------------------------------------------------------------------
+
+OutRec* Clipper::GetOutRec(int Idx)
+{
+  OutRec* outrec = m_PolyOuts[Idx];
+  while (outrec != m_PolyOuts[outrec->Idx])
+    outrec = m_PolyOuts[outrec->Idx];
+  return outrec;
+}
+//------------------------------------------------------------------------------
+
+void Clipper::AppendPolygon(TEdge *e1, TEdge *e2)
+{
+  //get the start and ends of both output polygons ...
+  OutRec *outRec1 = m_PolyOuts[e1->OutIdx];
+  OutRec *outRec2 = m_PolyOuts[e2->OutIdx];
+
+  OutRec *holeStateRec;
+  if (Param1RightOfParam2(outRec1, outRec2)) 
+    holeStateRec = outRec2;
+  else if (Param1RightOfParam2(outRec2, outRec1)) 
+    holeStateRec = outRec1;
+  else 
+    holeStateRec = GetLowermostRec(outRec1, outRec2);
+
+  //get the start and ends of both output polygons and
+  //join e2 poly onto e1 poly and delete pointers to e2 ...
+
+  OutPt* p1_lft = outRec1->Pts;
+  OutPt* p1_rt = p1_lft->Prev;
+  OutPt* p2_lft = outRec2->Pts;
+  OutPt* p2_rt = p2_lft->Prev;
+
+  EdgeSide Side;
+  //join e2 poly onto e1 poly and delete pointers to e2 ...
+  if(  e1->Side == esLeft )
+  {
+    if(  e2->Side == esLeft )
+    {
+      //z y x a b c
+      ReversePolyPtLinks(p2_lft);
+      p2_lft->Next = p1_lft;
+      p1_lft->Prev = p2_lft;
+      p1_rt->Next = p2_rt;
+      p2_rt->Prev = p1_rt;
+      outRec1->Pts = p2_rt;
+    } else
+    {
+      //x y z a b c
+      p2_rt->Next = p1_lft;
+      p1_lft->Prev = p2_rt;
+      p2_lft->Prev = p1_rt;
+      p1_rt->Next = p2_lft;
+      outRec1->Pts = p2_lft;
+    }
+    Side = esLeft;
+  } else
+  {
+    if(  e2->Side == esRight )
+    {
+      //a b c z y x
+      ReversePolyPtLinks(p2_lft);
+      p1_rt->Next = p2_rt;
+      p2_rt->Prev = p1_rt;
+      p2_lft->Next = p1_lft;
+      p1_lft->Prev = p2_lft;
+    } else
+    {
+      //a b c x y z
+      p1_rt->Next = p2_lft;
+      p2_lft->Prev = p1_rt;
+      p1_lft->Prev = p2_rt;
+      p2_rt->Next = p1_lft;
+    }
+    Side = esRight;
+  }
+
+  outRec1->BottomPt = 0;
+  if (holeStateRec == outRec2)
+  {
+    if (outRec2->FirstLeft != outRec1)
+      outRec1->FirstLeft = outRec2->FirstLeft;
+    outRec1->IsHole = outRec2->IsHole;
+  }
+  outRec2->Pts = 0;
+  outRec2->BottomPt = 0;
+  outRec2->FirstLeft = outRec1;
+
+  int OKIdx = e1->OutIdx;
+  int ObsoleteIdx = e2->OutIdx;
+
+  e1->OutIdx = Unassigned; //nb: safe because we only get here via AddLocalMaxPoly
+  e2->OutIdx = Unassigned;
+
+  TEdge* e = m_ActiveEdges;
+  while( e )
+  {
+    if( e->OutIdx == ObsoleteIdx )
+    {
+      e->OutIdx = OKIdx;
+      e->Side = Side;
+      break;
+    }
+    e = e->NextInAEL;
+  }
+
+  outRec2->Idx = outRec1->Idx;
+}
+//------------------------------------------------------------------------------
+
+OutRec* Clipper::CreateOutRec()
+{
+  OutRec* result = new OutRec;
+  result->IsHole = false;
+  result->IsOpen = false;
+  result->FirstLeft = 0;
+  result->Pts = 0;
+  result->BottomPt = 0;
+  result->PolyNd = 0;
+  m_PolyOuts.push_back(result);
+  result->Idx = (int)m_PolyOuts.size()-1;
+  return result;
+}
+//------------------------------------------------------------------------------
+
+OutPt* Clipper::AddOutPt(TEdge *e, const IntPoint &pt)
+{
+  bool ToFront = (e->Side == esLeft);
+  if(  e->OutIdx < 0 )
+  {
+    OutRec *outRec = CreateOutRec();
+    outRec->IsOpen = (e->WindDelta == 0);
+    OutPt* newOp = new OutPt;
+    outRec->Pts = newOp;
+    newOp->Idx = outRec->Idx;
+    newOp->Pt = pt;
+    newOp->Next = newOp;
+    newOp->Prev = newOp;
+    if (!outRec->IsOpen)
+      SetHoleState(e, outRec);
+    e->OutIdx = outRec->Idx;
+    return newOp;
+  } else
+  {
+    OutRec *outRec = m_PolyOuts[e->OutIdx];
+    //OutRec.Pts is the 'Left-most' point & OutRec.Pts.Prev is the 'Right-most'
+    OutPt* op = outRec->Pts;
+
+    if (ToFront && (pt == op->Pt)) return op;
+    else if (!ToFront && (pt == op->Prev->Pt)) return op->Prev;
+
+    OutPt* newOp = new OutPt;
+    newOp->Idx = outRec->Idx;
+    newOp->Pt = pt;
+    newOp->Next = op;
+    newOp->Prev = op->Prev;
+    newOp->Prev->Next = newOp;
+    op->Prev = newOp;
+    if (ToFront) outRec->Pts = newOp;
+    return newOp;
+  }
+}
+//------------------------------------------------------------------------------
+
+void Clipper::ProcessHorizontals(bool IsTopOfScanbeam)
+{
+  TEdge* horzEdge = m_SortedEdges;
+  while(horzEdge)
+  {
+    DeleteFromSEL(horzEdge);
+    ProcessHorizontal(horzEdge, IsTopOfScanbeam);
+    horzEdge = m_SortedEdges;
+  }
+}
+//------------------------------------------------------------------------------
+
+inline bool IsMinima(TEdge *e)
+{
+  return e  && (e->Prev->NextInLML != e) && (e->Next->NextInLML != e);
+}
+//------------------------------------------------------------------------------
+
+inline bool IsMaxima(TEdge *e, const cInt Y)
+{
+  return e && e->Top.Y == Y && !e->NextInLML;
+}
+//------------------------------------------------------------------------------
+
+inline bool IsIntermediate(TEdge *e, const cInt Y)
+{
+  return e->Top.Y == Y && e->NextInLML;
+}
+//------------------------------------------------------------------------------
+
+TEdge *GetMaximaPair(TEdge *e)
+{
+  TEdge* result = 0;
+  if ((e->Next->Top == e->Top) && !e->Next->NextInLML)
+    result = e->Next;
+  else if ((e->Prev->Top == e->Top) && !e->Prev->NextInLML)
+    result = e->Prev;
+
+  if (result && (result->OutIdx == Skip ||
+    //result is false if both NextInAEL & PrevInAEL are nil & not horizontal ...
+    (result->NextInAEL == result->PrevInAEL && !IsHorizontal(*result))))
+      return 0;
+  return result;
+}
+//------------------------------------------------------------------------------
+
+void Clipper::SwapPositionsInAEL(TEdge *Edge1, TEdge *Edge2)
+{
+  //check that one or other edge hasn't already been removed from AEL ...
+  if (Edge1->NextInAEL == Edge1->PrevInAEL || 
+    Edge2->NextInAEL == Edge2->PrevInAEL) return;
+
+  if(  Edge1->NextInAEL == Edge2 )
+  {
+    TEdge* Next = Edge2->NextInAEL;
+    if( Next ) Next->PrevInAEL = Edge1;
+    TEdge* Prev = Edge1->PrevInAEL;
+    if( Prev ) Prev->NextInAEL = Edge2;
+    Edge2->PrevInAEL = Prev;
+    Edge2->NextInAEL = Edge1;
+    Edge1->PrevInAEL = Edge2;
+    Edge1->NextInAEL = Next;
+  }
+  else if(  Edge2->NextInAEL == Edge1 )
+  {
+    TEdge* Next = Edge1->NextInAEL;
+    if( Next ) Next->PrevInAEL = Edge2;
+    TEdge* Prev = Edge2->PrevInAEL;
+    if( Prev ) Prev->NextInAEL = Edge1;
+    Edge1->PrevInAEL = Prev;
+    Edge1->NextInAEL = Edge2;
+    Edge2->PrevInAEL = Edge1;
+    Edge2->NextInAEL = Next;
+  }
+  else
+  {
+    TEdge* Next = Edge1->NextInAEL;
+    TEdge* Prev = Edge1->PrevInAEL;
+    Edge1->NextInAEL = Edge2->NextInAEL;
+    if( Edge1->NextInAEL ) Edge1->NextInAEL->PrevInAEL = Edge1;
+    Edge1->PrevInAEL = Edge2->PrevInAEL;
+    if( Edge1->PrevInAEL ) Edge1->PrevInAEL->NextInAEL = Edge1;
+    Edge2->NextInAEL = Next;
+    if( Edge2->NextInAEL ) Edge2->NextInAEL->PrevInAEL = Edge2;
+    Edge2->PrevInAEL = Prev;
+    if( Edge2->PrevInAEL ) Edge2->PrevInAEL->NextInAEL = Edge2;
+  }
+
+  if( !Edge1->PrevInAEL ) m_ActiveEdges = Edge1;
+  else if( !Edge2->PrevInAEL ) m_ActiveEdges = Edge2;
+}
+//------------------------------------------------------------------------------
+
+void Clipper::SwapPositionsInSEL(TEdge *Edge1, TEdge *Edge2)
+{
+  if(  !( Edge1->NextInSEL ) &&  !( Edge1->PrevInSEL ) ) return;
+  if(  !( Edge2->NextInSEL ) &&  !( Edge2->PrevInSEL ) ) return;
+
+  if(  Edge1->NextInSEL == Edge2 )
+  {
+    TEdge* Next = Edge2->NextInSEL;
+    if( Next ) Next->PrevInSEL = Edge1;
+    TEdge* Prev = Edge1->PrevInSEL;
+    if( Prev ) Prev->NextInSEL = Edge2;
+    Edge2->PrevInSEL = Prev;
+    Edge2->NextInSEL = Edge1;
+    Edge1->PrevInSEL = Edge2;
+    Edge1->NextInSEL = Next;
+  }
+  else if(  Edge2->NextInSEL == Edge1 )
+  {
+    TEdge* Next = Edge1->NextInSEL;
+    if( Next ) Next->PrevInSEL = Edge2;
+    TEdge* Prev = Edge2->PrevInSEL;
+    if( Prev ) Prev->NextInSEL = Edge1;
+    Edge1->PrevInSEL = Prev;
+    Edge1->NextInSEL = Edge2;
+    Edge2->PrevInSEL = Edge1;
+    Edge2->NextInSEL = Next;
+  }
+  else
+  {
+    TEdge* Next = Edge1->NextInSEL;
+    TEdge* Prev = Edge1->PrevInSEL;
+    Edge1->NextInSEL = Edge2->NextInSEL;
+    if( Edge1->NextInSEL ) Edge1->NextInSEL->PrevInSEL = Edge1;
+    Edge1->PrevInSEL = Edge2->PrevInSEL;
+    if( Edge1->PrevInSEL ) Edge1->PrevInSEL->NextInSEL = Edge1;
+    Edge2->NextInSEL = Next;
+    if( Edge2->NextInSEL ) Edge2->NextInSEL->PrevInSEL = Edge2;
+    Edge2->PrevInSEL = Prev;
+    if( Edge2->PrevInSEL ) Edge2->PrevInSEL->NextInSEL = Edge2;
+  }
+
+  if( !Edge1->PrevInSEL ) m_SortedEdges = Edge1;
+  else if( !Edge2->PrevInSEL ) m_SortedEdges = Edge2;
+}
+//------------------------------------------------------------------------------
+
+TEdge* GetNextInAEL(TEdge *e, Direction dir)
+{
+  return dir == dLeftToRight ? e->NextInAEL : e->PrevInAEL;
+}
+//------------------------------------------------------------------------------
+
+void GetHorzDirection(TEdge& HorzEdge, Direction& Dir, cInt& Left, cInt& Right)
+{
+  if (HorzEdge.Bot.X < HorzEdge.Top.X)
+  {
+    Left = HorzEdge.Bot.X;
+    Right = HorzEdge.Top.X;
+    Dir = dLeftToRight;
+  } else
+  {
+    Left = HorzEdge.Top.X;
+    Right = HorzEdge.Bot.X;
+    Dir = dRightToLeft;
+  }
+}
+//------------------------------------------------------------------------
+
+/*******************************************************************************
+* Notes: Horizontal edges (HEs) at scanline intersections (ie at the Top or    *
+* Bottom of a scanbeam) are processed as if layered. The order in which HEs    *
+* are processed doesn't matter. HEs intersect with other HE Bot.Xs only [#]    *
+* (or they could intersect with Top.Xs only, ie EITHER Bot.Xs OR Top.Xs),      *
+* and with other non-horizontal edges [*]. Once these intersections are        *
+* processed, intermediate HEs then 'promote' the Edge above (NextInLML) into   *
+* the AEL. These 'promoted' edges may in turn intersect [%] with other HEs.    *
+*******************************************************************************/
+
+void Clipper::ProcessHorizontal(TEdge *horzEdge, bool isTopOfScanbeam)
+{
+  Direction dir;
+  cInt horzLeft, horzRight;
+
+  GetHorzDirection(*horzEdge, dir, horzLeft, horzRight);
+
+  TEdge* eLastHorz = horzEdge, *eMaxPair = 0;
+  while (eLastHorz->NextInLML && IsHorizontal(*eLastHorz->NextInLML)) 
+    eLastHorz = eLastHorz->NextInLML;
+  if (!eLastHorz->NextInLML)
+    eMaxPair = GetMaximaPair(eLastHorz);
+
+  for (;;)
+  {
+    bool IsLastHorz = (horzEdge == eLastHorz);
+    TEdge* e = GetNextInAEL(horzEdge, dir);
+    while(e)
+    {
+      //Break if we've got to the end of an intermediate horizontal edge ...
+      //nb: Smaller Dx's are to the right of larger Dx's ABOVE the horizontal.
+      if (e->Curr.X == horzEdge->Top.X && horzEdge->NextInLML && 
+        e->Dx < horzEdge->NextInLML->Dx) break;
+
+      TEdge* eNext = GetNextInAEL(e, dir); //saves eNext for later
+
+      if ((dir == dLeftToRight && e->Curr.X <= horzRight) ||
+        (dir == dRightToLeft && e->Curr.X >= horzLeft))
+      {
+        //so far we're still in range of the horizontal Edge  but make sure
+        //we're at the last of consec. horizontals when matching with eMaxPair
+        if(e == eMaxPair && IsLastHorz)
+        {
+
+          if (horzEdge->OutIdx >= 0)
+          {
+            OutPt* op1 = AddOutPt(horzEdge, horzEdge->Top);
+            TEdge* eNextHorz = m_SortedEdges;
+            while (eNextHorz)
+            {
+              if (eNextHorz->OutIdx >= 0 &&
+                HorzSegmentsOverlap(horzEdge->Bot.X,
+                horzEdge->Top.X, eNextHorz->Bot.X, eNextHorz->Top.X))
+              {
+                OutPt* op2 = AddOutPt(eNextHorz, eNextHorz->Bot);
+                AddJoin(op2, op1, eNextHorz->Top);
+              }
+              eNextHorz = eNextHorz->NextInSEL;
+            }
+            AddGhostJoin(op1, horzEdge->Bot);
+            AddLocalMaxPoly(horzEdge, eMaxPair, horzEdge->Top);
+          }
+          DeleteFromAEL(horzEdge);
+          DeleteFromAEL(eMaxPair);
+          return;
+        }
+        else if(dir == dLeftToRight)
+        {
+          IntPoint Pt = IntPoint(e->Curr.X, horzEdge->Curr.Y);
+          IntersectEdges(horzEdge, e, Pt);
+        }
+        else
+        {
+          IntPoint Pt = IntPoint(e->Curr.X, horzEdge->Curr.Y);
+          IntersectEdges( e, horzEdge, Pt);
+        }
+        SwapPositionsInAEL( horzEdge, e );
+      }
+      else if( (dir == dLeftToRight && e->Curr.X >= horzRight) ||
+       (dir == dRightToLeft && e->Curr.X <= horzLeft) ) break;
+      e = eNext;
+    } //end while
+
+    if (horzEdge->NextInLML && IsHorizontal(*horzEdge->NextInLML))
+    {
+      UpdateEdgeIntoAEL(horzEdge);
+      if (horzEdge->OutIdx >= 0) AddOutPt(horzEdge, horzEdge->Bot);
+      GetHorzDirection(*horzEdge, dir, horzLeft, horzRight);
+    } else
+      break;
+  } //end for (;;)
+
+  if(horzEdge->NextInLML)
+  {
+    if(horzEdge->OutIdx >= 0)
+    {
+      OutPt* op1 = AddOutPt( horzEdge, horzEdge->Top);
+      if (isTopOfScanbeam) AddGhostJoin(op1, horzEdge->Bot);
+      UpdateEdgeIntoAEL(horzEdge);
+      if (horzEdge->WindDelta == 0) return;
+      //nb: HorzEdge is no longer horizontal here
+      TEdge* ePrev = horzEdge->PrevInAEL;
+      TEdge* eNext = horzEdge->NextInAEL;
+      if (ePrev && ePrev->Curr.X == horzEdge->Bot.X &&
+        ePrev->Curr.Y == horzEdge->Bot.Y && ePrev->WindDelta != 0 &&
+        (ePrev->OutIdx >= 0 && ePrev->Curr.Y > ePrev->Top.Y &&
+        SlopesEqual(*horzEdge, *ePrev, m_UseFullRange)))
+      {
+        OutPt* op2 = AddOutPt(ePrev, horzEdge->Bot);
+        AddJoin(op1, op2, horzEdge->Top);
+      }
+      else if (eNext && eNext->Curr.X == horzEdge->Bot.X &&
+        eNext->Curr.Y == horzEdge->Bot.Y && eNext->WindDelta != 0 &&
+        eNext->OutIdx >= 0 && eNext->Curr.Y > eNext->Top.Y &&
+        SlopesEqual(*horzEdge, *eNext, m_UseFullRange))
+      {
+        OutPt* op2 = AddOutPt(eNext, horzEdge->Bot);
+        AddJoin(op1, op2, horzEdge->Top);
+      }
+    }
+    else
+      UpdateEdgeIntoAEL(horzEdge); 
+  }
+  else
+  {
+    if (horzEdge->OutIdx >= 0) AddOutPt(horzEdge, horzEdge->Top);
+    DeleteFromAEL(horzEdge);
+  }
+}
+//------------------------------------------------------------------------------
+
+void Clipper::UpdateEdgeIntoAEL(TEdge *&e)
+{
+  if( !e->NextInLML ) throw
+    clipperException("UpdateEdgeIntoAEL: invalid call");
+
+  e->NextInLML->OutIdx = e->OutIdx;
+  TEdge* AelPrev = e->PrevInAEL;
+  TEdge* AelNext = e->NextInAEL;
+  if (AelPrev) AelPrev->NextInAEL = e->NextInLML;
+  else m_ActiveEdges = e->NextInLML;
+  if (AelNext) AelNext->PrevInAEL = e->NextInLML;
+  e->NextInLML->Side = e->Side;
+  e->NextInLML->WindDelta = e->WindDelta;
+  e->NextInLML->WindCnt = e->WindCnt;
+  e->NextInLML->WindCnt2 = e->WindCnt2;
+  e = e->NextInLML;
+  e->Curr = e->Bot;
+  e->PrevInAEL = AelPrev;
+  e->NextInAEL = AelNext;
+  if (!IsHorizontal(*e)) InsertScanbeam(e->Top.Y);
+}
+//------------------------------------------------------------------------------
+
+bool Clipper::ProcessIntersections(const cInt botY, const cInt topY)
+{
+  if( !m_ActiveEdges ) return true;
+  try {
+    BuildIntersectList(botY, topY);
+    size_t IlSize = m_IntersectList.size();
+    if (IlSize == 0) return true;
+    if (IlSize == 1 || FixupIntersectionOrder()) ProcessIntersectList();
+    else return false;
+  }
+  catch(...) 
+  {
+    m_SortedEdges = 0;
+    DisposeIntersectNodes();
+    throw clipperException("ProcessIntersections error");
+  }
+  m_SortedEdges = 0;
+  return true;
+}
+//------------------------------------------------------------------------------
+
+void Clipper::DisposeIntersectNodes()
+{
+  for (size_t i = 0; i < m_IntersectList.size(); ++i )
+    delete m_IntersectList[i];
+  m_IntersectList.clear();
+}
+//------------------------------------------------------------------------------
+
+void Clipper::BuildIntersectList(const cInt botY, const cInt topY)
+{
+  if ( !m_ActiveEdges ) return;
+
+  //prepare for sorting ...
+  TEdge* e = m_ActiveEdges;
+  m_SortedEdges = e;
+  while( e )
+  {
+    e->PrevInSEL = e->PrevInAEL;
+    e->NextInSEL = e->NextInAEL;
+    e->Curr.X = TopX( *e, topY );
+    e = e->NextInAEL;
+  }
+
+  //bubblesort ...
+  bool isModified;
+  do
+  {
+    isModified = false;
+    e = m_SortedEdges;
+    while( e->NextInSEL )
+    {
+      TEdge *eNext = e->NextInSEL;
+      IntPoint Pt;
+      if(e->Curr.X > eNext->Curr.X)
+      {
+        IntersectPoint(*e, *eNext, Pt);
+        IntersectNode * newNode = new IntersectNode;
+        newNode->Edge1 = e;
+        newNode->Edge2 = eNext;
+        newNode->Pt = Pt;
+        m_IntersectList.push_back(newNode);
+
+        SwapPositionsInSEL(e, eNext);
+        isModified = true;
+      }
+      else
+        e = eNext;
+    }
+    if( e->PrevInSEL ) e->PrevInSEL->NextInSEL = 0;
+    else break;
+  }
+  while ( isModified );
+  m_SortedEdges = 0; //important
+}
+//------------------------------------------------------------------------------
+
+
+void Clipper::ProcessIntersectList()
+{
+  for (size_t i = 0; i < m_IntersectList.size(); ++i)
+  {
+    IntersectNode* iNode = m_IntersectList[i];
+    {
+      IntersectEdges( iNode->Edge1, iNode->Edge2, iNode->Pt);
+      SwapPositionsInAEL( iNode->Edge1 , iNode->Edge2 );
+    }
+    delete iNode;
+  }
+  m_IntersectList.clear();
+}
+//------------------------------------------------------------------------------
+
+bool IntersectListSort(IntersectNode* node1, IntersectNode* node2)
+{
+  return node2->Pt.Y < node1->Pt.Y;
+}
+//------------------------------------------------------------------------------
+
+inline bool EdgesAdjacent(const IntersectNode &inode)
+{
+  return (inode.Edge1->NextInSEL == inode.Edge2) ||
+    (inode.Edge1->PrevInSEL == inode.Edge2);
+}
+//------------------------------------------------------------------------------
+
+bool Clipper::FixupIntersectionOrder()
+{
+  //pre-condition: intersections are sorted Bottom-most first.
+  //Now it's crucial that intersections are made only between adjacent edges,
+  //so to ensure this the order of intersections may need adjusting ...
+  CopyAELToSEL();
+  std::sort(m_IntersectList.begin(), m_IntersectList.end(), IntersectListSort);
+  size_t cnt = m_IntersectList.size();
+  for (size_t i = 0; i < cnt; ++i) 
+  {
+    if (!EdgesAdjacent(*m_IntersectList[i]))
+    {
+      size_t j = i + 1;
+      while (j < cnt && !EdgesAdjacent(*m_IntersectList[j])) j++;
+      if (j == cnt)  return false;
+      std::swap(m_IntersectList[i], m_IntersectList[j]);
+    }
+    SwapPositionsInSEL(m_IntersectList[i]->Edge1, m_IntersectList[i]->Edge2);
+  }
+  return true;
+}
+//------------------------------------------------------------------------------
+
+void Clipper::DoMaxima(TEdge *e)
+{
+  TEdge* eMaxPair = GetMaximaPair(e);
+  if (!eMaxPair)
+  {
+    if (e->OutIdx >= 0)
+      AddOutPt(e, e->Top);
+    DeleteFromAEL(e);
+    return;
+  }
+
+  TEdge* eNext = e->NextInAEL;
+  while(eNext && eNext != eMaxPair)
+  {
+    IntersectEdges(e, eNext, e->Top);
+    SwapPositionsInAEL(e, eNext);
+    eNext = e->NextInAEL;
+  }
+
+  if(e->OutIdx == Unassigned && eMaxPair->OutIdx == Unassigned)
+  {
+    DeleteFromAEL(e);
+    DeleteFromAEL(eMaxPair);
+  }
+  else if( e->OutIdx >= 0 && eMaxPair->OutIdx >= 0 )
+  {
+    if (e->OutIdx >= 0) AddLocalMaxPoly(e, eMaxPair, e->Top);
+    DeleteFromAEL(e);
+    DeleteFromAEL(eMaxPair);
+  }
+#ifdef use_lines
+  else if (e->WindDelta == 0)
+  {
+    if (e->OutIdx >= 0) 
+    {
+      AddOutPt(e, e->Top);
+      e->OutIdx = Unassigned;
+    }
+    DeleteFromAEL(e);
+
+    if (eMaxPair->OutIdx >= 0)
+    {
+      AddOutPt(eMaxPair, e->Top);
+      eMaxPair->OutIdx = Unassigned;
+    }
+    DeleteFromAEL(eMaxPair);
+  } 
+#endif
+  else throw clipperException("DoMaxima error");
+}
+//------------------------------------------------------------------------------
+
+void Clipper::ProcessEdgesAtTopOfScanbeam(const cInt topY)
+{
+  TEdge* e = m_ActiveEdges;
+  while( e )
+  {
+    //1. process maxima, treating them as if they're 'bent' horizontal edges,
+    //   but exclude maxima with horizontal edges. nb: e can't be a horizontal.
+    bool IsMaximaEdge = IsMaxima(e, topY);
+
+    if(IsMaximaEdge)
+    {
+      TEdge* eMaxPair = GetMaximaPair(e);
+      IsMaximaEdge = (!eMaxPair || !IsHorizontal(*eMaxPair));
+    }
+
+    if(IsMaximaEdge)
+    {
+      TEdge* ePrev = e->PrevInAEL;
+      DoMaxima(e);
+      if( !ePrev ) e = m_ActiveEdges;
+      else e = ePrev->NextInAEL;
+    }
+    else
+    {
+      //2. promote horizontal edges, otherwise update Curr.X and Curr.Y ...
+      if (IsIntermediate(e, topY) && IsHorizontal(*e->NextInLML))
+      {
+        UpdateEdgeIntoAEL(e);
+        if (e->OutIdx >= 0)
+          AddOutPt(e, e->Bot);
+        AddEdgeToSEL(e);
+      } 
+      else
+      {
+        e->Curr.X = TopX( *e, topY );
+        e->Curr.Y = topY;
+      }
+
+      if (m_StrictSimple)
+      {  
+        TEdge* ePrev = e->PrevInAEL;
+        if ((e->OutIdx >= 0) && (e->WindDelta != 0) && ePrev && (ePrev->OutIdx >= 0) &&
+          (ePrev->Curr.X == e->Curr.X) && (ePrev->WindDelta != 0))
+        {
+          IntPoint pt = e->Curr;
+#ifdef use_xyz
+          SetZ(pt, *ePrev, *e);
+#endif
+          OutPt* op = AddOutPt(ePrev, pt);
+          OutPt* op2 = AddOutPt(e, pt);
+          AddJoin(op, op2, pt); //StrictlySimple (type-3) join
+        }
+      }
+
+      e = e->NextInAEL;
+    }
+  }
+
+  //3. Process horizontals at the Top of the scanbeam ...
+  ProcessHorizontals(true);
+
+  //4. Promote intermediate vertices ...
+  e = m_ActiveEdges;
+  while(e)
+  {
+    if(IsIntermediate(e, topY))
+    {
+      OutPt* op = 0;
+      if( e->OutIdx >= 0 ) 
+        op = AddOutPt(e, e->Top);
+      UpdateEdgeIntoAEL(e);
+
+      //if output polygons share an edge, they'll need joining later ...
+      TEdge* ePrev = e->PrevInAEL;
+      TEdge* eNext = e->NextInAEL;
+      if (ePrev && ePrev->Curr.X == e->Bot.X &&
+        ePrev->Curr.Y == e->Bot.Y && op &&
+        ePrev->OutIdx >= 0 && ePrev->Curr.Y > ePrev->Top.Y &&
+        SlopesEqual(*e, *ePrev, m_UseFullRange) &&
+        (e->WindDelta != 0) && (ePrev->WindDelta != 0))
+      {
+        OutPt* op2 = AddOutPt(ePrev, e->Bot);
+        AddJoin(op, op2, e->Top);
+      }
+      else if (eNext && eNext->Curr.X == e->Bot.X &&
+        eNext->Curr.Y == e->Bot.Y && op &&
+        eNext->OutIdx >= 0 && eNext->Curr.Y > eNext->Top.Y &&
+        SlopesEqual(*e, *eNext, m_UseFullRange) &&
+        (e->WindDelta != 0) && (eNext->WindDelta != 0))
+      {
+        OutPt* op2 = AddOutPt(eNext, e->Bot);
+        AddJoin(op, op2, e->Top);
+      }
+    }
+    e = e->NextInAEL;
+  }
+}
+//------------------------------------------------------------------------------
+
+void Clipper::FixupOutPolygon(OutRec &outrec)
+{
+  //FixupOutPolygon() - removes duplicate points and simplifies consecutive
+  //parallel edges by removing the middle vertex.
+  OutPt *lastOK = 0;
+  outrec.BottomPt = 0;
+  OutPt *pp = outrec.Pts;
+
+  for (;;)
+  {
+    if (pp->Prev == pp || pp->Prev == pp->Next )
+    {
+      DisposeOutPts(pp);
+      outrec.Pts = 0;
+      return;
+    }
+
+    //test for duplicate points and collinear edges ...
+    if ((pp->Pt == pp->Next->Pt) || (pp->Pt == pp->Prev->Pt) || 
+      (SlopesEqual(pp->Prev->Pt, pp->Pt, pp->Next->Pt, m_UseFullRange) &&
+      (!m_PreserveCollinear || 
+      !Pt2IsBetweenPt1AndPt3(pp->Prev->Pt, pp->Pt, pp->Next->Pt))))
+    {
+      lastOK = 0;
+      OutPt *tmp = pp;
+      pp->Prev->Next = pp->Next;
+      pp->Next->Prev = pp->Prev;
+      pp = pp->Prev;
+      delete tmp;
+    }
+    else if (pp == lastOK) break;
+    else
+    {
+      if (!lastOK) lastOK = pp;
+      pp = pp->Next;
+    }
+  }
+  outrec.Pts = pp;
+}
+//------------------------------------------------------------------------------
+
+int PointCount(OutPt *Pts)
+{
+    if (!Pts) return 0;
+    int result = 0;
+    OutPt* p = Pts;
+    do
+    {
+        result++;
+        p = p->Next;
+    }
+    while (p != Pts);
+    return result;
+}
+//------------------------------------------------------------------------------
+
+void Clipper::BuildResult(Paths &polys)
+{
+  polys.reserve(m_PolyOuts.size());
+  for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
+  {
+    if (!m_PolyOuts[i]->Pts) continue;
+    Path pg;
+    OutPt* p = m_PolyOuts[i]->Pts->Prev;
+    int cnt = PointCount(p);
+    if (cnt < 2) continue;
+    pg.reserve(cnt);
+    for (int i = 0; i < cnt; ++i)
+    {
+      pg.push_back(p->Pt);
+      p = p->Prev;
+    }
+    polys.push_back(pg);
+  }
+}
+//------------------------------------------------------------------------------
+
+void Clipper::BuildResult2(PolyTree& polytree)
+{
+    polytree.Clear();
+    polytree.AllNodes.reserve(m_PolyOuts.size());
+    //add each output polygon/contour to polytree ...
+    for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); i++)
+    {
+        OutRec* outRec = m_PolyOuts[i];
+        int cnt = PointCount(outRec->Pts);
+        if ((outRec->IsOpen && cnt < 2) || (!outRec->IsOpen && cnt < 3)) continue;
+        FixHoleLinkage(*outRec);
+        PolyNode* pn = new PolyNode();
+        //nb: polytree takes ownership of all the PolyNodes
+        polytree.AllNodes.push_back(pn);
+        outRec->PolyNd = pn;
+        pn->Parent = 0;
+        pn->Index = 0;
+        pn->Contour.reserve(cnt);
+        OutPt *op = outRec->Pts->Prev;
+        for (int j = 0; j < cnt; j++)
+        {
+            pn->Contour.push_back(op->Pt);
+            op = op->Prev;
+        }
+    }
+
+    //fixup PolyNode links etc ...
+    polytree.Childs.reserve(m_PolyOuts.size());
+    for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); i++)
+    {
+        OutRec* outRec = m_PolyOuts[i];
+        if (!outRec->PolyNd) continue;
+        if (outRec->IsOpen) 
+        {
+          outRec->PolyNd->m_IsOpen = true;
+          polytree.AddChild(*outRec->PolyNd);
+        }
+        else if (outRec->FirstLeft && outRec->FirstLeft->PolyNd) 
+          outRec->FirstLeft->PolyNd->AddChild(*outRec->PolyNd);
+        else
+          polytree.AddChild(*outRec->PolyNd);
+    }
+}
+//------------------------------------------------------------------------------
+
+void SwapIntersectNodes(IntersectNode &int1, IntersectNode &int2)
+{
+  //just swap the contents (because fIntersectNodes is a single-linked-list)
+  IntersectNode inode = int1; //gets a copy of Int1
+  int1.Edge1 = int2.Edge1;
+  int1.Edge2 = int2.Edge2;
+  int1.Pt = int2.Pt;
+  int2.Edge1 = inode.Edge1;
+  int2.Edge2 = inode.Edge2;
+  int2.Pt = inode.Pt;
+}
+//------------------------------------------------------------------------------
+
+inline bool E2InsertsBeforeE1(TEdge &e1, TEdge &e2)
+{
+  if (e2.Curr.X == e1.Curr.X) 
+  {
+    if (e2.Top.Y > e1.Top.Y)
+      return e2.Top.X < TopX(e1, e2.Top.Y); 
+      else return e1.Top.X > TopX(e2, e1.Top.Y);
+  } 
+  else return e2.Curr.X < e1.Curr.X;
+}
+//------------------------------------------------------------------------------
+
+bool GetOverlap(const cInt a1, const cInt a2, const cInt b1, const cInt b2, 
+    cInt& Left, cInt& Right)
+{
+  if (a1 < a2)
+  {
+    if (b1 < b2) {Left = std::max(a1,b1); Right = std::min(a2,b2);}
+    else {Left = std::max(a1,b2); Right = std::min(a2,b1);}
+  } 
+  else
+  {
+    if (b1 < b2) {Left = std::max(a2,b1); Right = std::min(a1,b2);}
+    else {Left = std::max(a2,b2); Right = std::min(a1,b1);}
+  }
+  return Left < Right;
+}
+//------------------------------------------------------------------------------
+
+inline void UpdateOutPtIdxs(OutRec& outrec)
+{  
+  OutPt* op = outrec.Pts;
+  do
+  {
+    op->Idx = outrec.Idx;
+    op = op->Prev;
+  }
+  while(op != outrec.Pts);
+}
+//------------------------------------------------------------------------------
+
+void Clipper::InsertEdgeIntoAEL(TEdge *edge, TEdge* startEdge)
+{
+  if(!m_ActiveEdges)
+  {
+    edge->PrevInAEL = 0;
+    edge->NextInAEL = 0;
+    m_ActiveEdges = edge;
+  }
+  else if(!startEdge && E2InsertsBeforeE1(*m_ActiveEdges, *edge))
+  {
+      edge->PrevInAEL = 0;
+      edge->NextInAEL = m_ActiveEdges;
+      m_ActiveEdges->PrevInAEL = edge;
+      m_ActiveEdges = edge;
+  } 
+  else
+  {
+    if(!startEdge) startEdge = m_ActiveEdges;
+    while(startEdge->NextInAEL  && 
+      !E2InsertsBeforeE1(*startEdge->NextInAEL , *edge))
+        startEdge = startEdge->NextInAEL;
+    edge->NextInAEL = startEdge->NextInAEL;
+    if(startEdge->NextInAEL) startEdge->NextInAEL->PrevInAEL = edge;
+    edge->PrevInAEL = startEdge;
+    startEdge->NextInAEL = edge;
+  }
+}
+//----------------------------------------------------------------------
+
+OutPt* DupOutPt(OutPt* outPt, bool InsertAfter)
+{
+  OutPt* result = new OutPt;
+  result->Pt = outPt->Pt;
+  result->Idx = outPt->Idx;
+  if (InsertAfter)
+  {
+    result->Next = outPt->Next;
+    result->Prev = outPt;
+    outPt->Next->Prev = result;
+    outPt->Next = result;
+  } 
+  else
+  {
+    result->Prev = outPt->Prev;
+    result->Next = outPt;
+    outPt->Prev->Next = result;
+    outPt->Prev = result;
+  }
+  return result;
+}
+//------------------------------------------------------------------------------
+
+bool JoinHorz(OutPt* op1, OutPt* op1b, OutPt* op2, OutPt* op2b,
+  const IntPoint Pt, bool DiscardLeft)
+{
+  Direction Dir1 = (op1->Pt.X > op1b->Pt.X ? dRightToLeft : dLeftToRight);
+  Direction Dir2 = (op2->Pt.X > op2b->Pt.X ? dRightToLeft : dLeftToRight);
+  if (Dir1 == Dir2) return false;
+
+  //When DiscardLeft, we want Op1b to be on the Left of Op1, otherwise we
+  //want Op1b to be on the Right. (And likewise with Op2 and Op2b.)
+  //So, to facilitate this while inserting Op1b and Op2b ...
+  //when DiscardLeft, make sure we're AT or RIGHT of Pt before adding Op1b,
+  //otherwise make sure we're AT or LEFT of Pt. (Likewise with Op2b.)
+  if (Dir1 == dLeftToRight) 
+  {
+    while (op1->Next->Pt.X <= Pt.X && 
+      op1->Next->Pt.X >= op1->Pt.X && op1->Next->Pt.Y == Pt.Y)  
+        op1 = op1->Next;
+    if (DiscardLeft && (op1->Pt.X != Pt.X)) op1 = op1->Next;
+    op1b = DupOutPt(op1, !DiscardLeft);
+    if (op1b->Pt != Pt) 
+    {
+      op1 = op1b;
+      op1->Pt = Pt;
+      op1b = DupOutPt(op1, !DiscardLeft);
+    }
+  } 
+  else
+  {
+    while (op1->Next->Pt.X >= Pt.X && 
+      op1->Next->Pt.X <= op1->Pt.X && op1->Next->Pt.Y == Pt.Y) 
+        op1 = op1->Next;
+    if (!DiscardLeft && (op1->Pt.X != Pt.X)) op1 = op1->Next;
+    op1b = DupOutPt(op1, DiscardLeft);
+    if (op1b->Pt != Pt)
+    {
+      op1 = op1b;
+      op1->Pt = Pt;
+      op1b = DupOutPt(op1, DiscardLeft);
+    }
+  }
+
+  if (Dir2 == dLeftToRight)
+  {
+    while (op2->Next->Pt.X <= Pt.X && 
+      op2->Next->Pt.X >= op2->Pt.X && op2->Next->Pt.Y == Pt.Y)
+        op2 = op2->Next;
+    if (DiscardLeft && (op2->Pt.X != Pt.X)) op2 = op2->Next;
+    op2b = DupOutPt(op2, !DiscardLeft);
+    if (op2b->Pt != Pt)
+    {
+      op2 = op2b;
+      op2->Pt = Pt;
+      op2b = DupOutPt(op2, !DiscardLeft);
+    };
+  } else
+  {
+    while (op2->Next->Pt.X >= Pt.X && 
+      op2->Next->Pt.X <= op2->Pt.X && op2->Next->Pt.Y == Pt.Y) 
+        op2 = op2->Next;
+    if (!DiscardLeft && (op2->Pt.X != Pt.X)) op2 = op2->Next;
+    op2b = DupOutPt(op2, DiscardLeft);
+    if (op2b->Pt != Pt)
+    {
+      op2 = op2b;
+      op2->Pt = Pt;
+      op2b = DupOutPt(op2, DiscardLeft);
+    };
+  };
+
+  if ((Dir1 == dLeftToRight) == DiscardLeft)
+  {
+    op1->Prev = op2;
+    op2->Next = op1;
+    op1b->Next = op2b;
+    op2b->Prev = op1b;
+  }
+  else
+  {
+    op1->Next = op2;
+    op2->Prev = op1;
+    op1b->Prev = op2b;
+    op2b->Next = op1b;
+  }
+  return true;
+}
+//------------------------------------------------------------------------------
+
+bool Clipper::JoinPoints(Join *j, OutRec* outRec1, OutRec* outRec2)
+{
+  OutPt *op1 = j->OutPt1, *op1b;
+  OutPt *op2 = j->OutPt2, *op2b;
+
+  //There are 3 kinds of joins for output polygons ...
+  //1. Horizontal joins where Join.OutPt1 & Join.OutPt2 are a vertices anywhere
+  //along (horizontal) collinear edges (& Join.OffPt is on the same horizontal).
+  //2. Non-horizontal joins where Join.OutPt1 & Join.OutPt2 are at the same
+  //location at the Bottom of the overlapping segment (& Join.OffPt is above).
+  //3. StrictSimple joins where edges touch but are not collinear and where
+  //Join.OutPt1, Join.OutPt2 & Join.OffPt all share the same point.
+  bool isHorizontal = (j->OutPt1->Pt.Y == j->OffPt.Y);
+
+  if (isHorizontal  && (j->OffPt == j->OutPt1->Pt) &&
+  (j->OffPt == j->OutPt2->Pt))
+  {
+    //Strictly Simple join ...
+    if (outRec1 != outRec2) return false;
+    op1b = j->OutPt1->Next;
+    while (op1b != op1 && (op1b->Pt == j->OffPt)) 
+      op1b = op1b->Next;
+    bool reverse1 = (op1b->Pt.Y > j->OffPt.Y);
+    op2b = j->OutPt2->Next;
+    while (op2b != op2 && (op2b->Pt == j->OffPt)) 
+      op2b = op2b->Next;
+    bool reverse2 = (op2b->Pt.Y > j->OffPt.Y);
+    if (reverse1 == reverse2) return false;
+    if (reverse1)
+    {
+      op1b = DupOutPt(op1, false);
+      op2b = DupOutPt(op2, true);
+      op1->Prev = op2;
+      op2->Next = op1;
+      op1b->Next = op2b;
+      op2b->Prev = op1b;
+      j->OutPt1 = op1;
+      j->OutPt2 = op1b;
+      return true;
+    } else
+    {
+      op1b = DupOutPt(op1, true);
+      op2b = DupOutPt(op2, false);
+      op1->Next = op2;
+      op2->Prev = op1;
+      op1b->Prev = op2b;
+      op2b->Next = op1b;
+      j->OutPt1 = op1;
+      j->OutPt2 = op1b;
+      return true;
+    }
+  } 
+  else if (isHorizontal)
+  {
+    //treat horizontal joins differently to non-horizontal joins since with
+    //them we're not yet sure where the overlapping is. OutPt1.Pt & OutPt2.Pt
+    //may be anywhere along the horizontal edge.
+    op1b = op1;
+    while (op1->Prev->Pt.Y == op1->Pt.Y && op1->Prev != op1b && op1->Prev != op2)
+      op1 = op1->Prev;
+    while (op1b->Next->Pt.Y == op1b->Pt.Y && op1b->Next != op1 && op1b->Next != op2)
+      op1b = op1b->Next;
+    if (op1b->Next == op1 || op1b->Next == op2) return false; //a flat 'polygon'
+
+    op2b = op2;
+    while (op2->Prev->Pt.Y == op2->Pt.Y && op2->Prev != op2b && op2->Prev != op1b)
+      op2 = op2->Prev;
+    while (op2b->Next->Pt.Y == op2b->Pt.Y && op2b->Next != op2 && op2b->Next != op1)
+      op2b = op2b->Next;
+    if (op2b->Next == op2 || op2b->Next == op1) return false; //a flat 'polygon'
+
+    cInt Left, Right;
+    //Op1 --> Op1b & Op2 --> Op2b are the extremites of the horizontal edges
+    if (!GetOverlap(op1->Pt.X, op1b->Pt.X, op2->Pt.X, op2b->Pt.X, Left, Right))
+      return false;
+
+    //DiscardLeftSide: when overlapping edges are joined, a spike will created
+    //which needs to be cleaned up. However, we don't want Op1 or Op2 caught up
+    //on the discard Side as either may still be needed for other joins ...
+    IntPoint Pt;
+    bool DiscardLeftSide;
+    if (op1->Pt.X >= Left && op1->Pt.X <= Right) 
+    {
+      Pt = op1->Pt; DiscardLeftSide = (op1->Pt.X > op1b->Pt.X);
+    } 
+    else if (op2->Pt.X >= Left&& op2->Pt.X <= Right) 
+    {
+      Pt = op2->Pt; DiscardLeftSide = (op2->Pt.X > op2b->Pt.X);
+    } 
+    else if (op1b->Pt.X >= Left && op1b->Pt.X <= Right)
+    {
+      Pt = op1b->Pt; DiscardLeftSide = op1b->Pt.X > op1->Pt.X;
+    } 
+    else
+    {
+      Pt = op2b->Pt; DiscardLeftSide = (op2b->Pt.X > op2->Pt.X);
+    }
+    j->OutPt1 = op1; j->OutPt2 = op2;
+    return JoinHorz(op1, op1b, op2, op2b, Pt, DiscardLeftSide);
+  } else
+  {
+    //nb: For non-horizontal joins ...
+    //    1. Jr.OutPt1.Pt.Y == Jr.OutPt2.Pt.Y
+    //    2. Jr.OutPt1.Pt > Jr.OffPt.Y
+
+    //make sure the polygons are correctly oriented ...
+    op1b = op1->Next;
+    while ((op1b->Pt == op1->Pt) && (op1b != op1)) op1b = op1b->Next;
+    bool Reverse1 = ((op1b->Pt.Y > op1->Pt.Y) ||
+      !SlopesEqual(op1->Pt, op1b->Pt, j->OffPt, m_UseFullRange));
+    if (Reverse1)
+    {
+      op1b = op1->Prev;
+      while ((op1b->Pt == op1->Pt) && (op1b != op1)) op1b = op1b->Prev;
+      if ((op1b->Pt.Y > op1->Pt.Y) ||
+        !SlopesEqual(op1->Pt, op1b->Pt, j->OffPt, m_UseFullRange)) return false;
+    };
+    op2b = op2->Next;
+    while ((op2b->Pt == op2->Pt) && (op2b != op2))op2b = op2b->Next;
+    bool Reverse2 = ((op2b->Pt.Y > op2->Pt.Y) ||
+      !SlopesEqual(op2->Pt, op2b->Pt, j->OffPt, m_UseFullRange));
+    if (Reverse2)
+    {
+      op2b = op2->Prev;
+      while ((op2b->Pt == op2->Pt) && (op2b != op2)) op2b = op2b->Prev;
+      if ((op2b->Pt.Y > op2->Pt.Y) ||
+        !SlopesEqual(op2->Pt, op2b->Pt, j->OffPt, m_UseFullRange)) return false;
+    }
+
+    if ((op1b == op1) || (op2b == op2) || (op1b == op2b) ||
+      ((outRec1 == outRec2) && (Reverse1 == Reverse2))) return false;
+
+    if (Reverse1)
+    {
+      op1b = DupOutPt(op1, false);
+      op2b = DupOutPt(op2, true);
+      op1->Prev = op2;
+      op2->Next = op1;
+      op1b->Next = op2b;
+      op2b->Prev = op1b;
+      j->OutPt1 = op1;
+      j->OutPt2 = op1b;
+      return true;
+    } else
+    {
+      op1b = DupOutPt(op1, true);
+      op2b = DupOutPt(op2, false);
+      op1->Next = op2;
+      op2->Prev = op1;
+      op1b->Prev = op2b;
+      op2b->Next = op1b;
+      j->OutPt1 = op1;
+      j->OutPt2 = op1b;
+      return true;
+    }
+  }
+}
+//----------------------------------------------------------------------
+
+static OutRec* ParseFirstLeft(OutRec* FirstLeft)
+{
+  while (FirstLeft && !FirstLeft->Pts)
+    FirstLeft = FirstLeft->FirstLeft;
+  return FirstLeft;
+}
+//------------------------------------------------------------------------------
+
+void Clipper::FixupFirstLefts1(OutRec* OldOutRec, OutRec* NewOutRec)
+{ 
+  //tests if NewOutRec contains the polygon before reassigning FirstLeft
+  for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
+  {
+    OutRec* outRec = m_PolyOuts[i];
+    if (!outRec->Pts || !outRec->FirstLeft) continue;
+    OutRec* firstLeft = ParseFirstLeft(outRec->FirstLeft);
+    if (firstLeft == OldOutRec)
+    {
+      if (Poly2ContainsPoly1(outRec->Pts, NewOutRec->Pts))
+        outRec->FirstLeft = NewOutRec;
+    }
+  }
+}
+//----------------------------------------------------------------------
+
+void Clipper::FixupFirstLefts2(OutRec* OldOutRec, OutRec* NewOutRec)
+{ 
+  //reassigns FirstLeft WITHOUT testing if NewOutRec contains the polygon
+  for (PolyOutList::size_type i = 0; i < m_PolyOuts.size(); ++i)
+  {
+    OutRec* outRec = m_PolyOuts[i];
+    if (outRec->FirstLeft == OldOutRec) outRec->FirstLeft = NewOutRec;
+  }
+}
+//----------------------------------------------------------------------
+
+void Clipper::JoinCommonEdges()
+{
+  for (JoinList::size_type i = 0; i < m_Joins.size(); i++)
+  {
+    Join* join = m_Joins[i];
+
+    OutRec *outRec1 = GetOutRec(join->OutPt1->Idx);
+    OutRec *outRec2 = GetOutRec(join->OutPt2->Idx);
+
+    if (!outRec1->Pts || !outRec2->Pts) continue;
+
+    //get the polygon fragment with the correct hole state (FirstLeft)
+    //before calling JoinPoints() ...
+    OutRec *holeStateRec;
+    if (outRec1 == outRec2) holeStateRec = outRec1;
+    else if (Param1RightOfParam2(outRec1, outRec2)) holeStateRec = outRec2;
+    else if (Param1RightOfParam2(outRec2, outRec1)) holeStateRec = outRec1;
+    else holeStateRec = GetLowermostRec(outRec1, outRec2);
+
+    if (!JoinPoints(join, outRec1, outRec2)) continue;
+
+    if (outRec1 == outRec2)
+    {
+      //instead of joining two polygons, we've just created a new one by
+      //splitting one polygon into two.
+      outRec1->Pts = join->OutPt1;
+      outRec1->BottomPt = 0;
+      outRec2 = CreateOutRec();
+      outRec2->Pts = join->OutPt2;
+
+      //update all OutRec2.Pts Idx's ...
+      UpdateOutPtIdxs(*outRec2);
+
+      //We now need to check every OutRec.FirstLeft pointer. If it points
+      //to OutRec1 it may need to point to OutRec2 instead ...
+      if (m_UsingPolyTree)
+        for (PolyOutList::size_type j = 0; j < m_PolyOuts.size() - 1; j++)
+        {
+          OutRec* oRec = m_PolyOuts[j];
+          if (!oRec->Pts || ParseFirstLeft(oRec->FirstLeft) != outRec1 ||
+            oRec->IsHole == outRec1->IsHole) continue;
+          if (Poly2ContainsPoly1(oRec->Pts, join->OutPt2))
+            oRec->FirstLeft = outRec2;
+        }
+
+      if (Poly2ContainsPoly1(outRec2->Pts, outRec1->Pts))
+      {
+        //outRec2 is contained by outRec1 ...
+        outRec2->IsHole = !outRec1->IsHole;
+        outRec2->FirstLeft = outRec1;
+
+        //fixup FirstLeft pointers that may need reassigning to OutRec1
+        if (m_UsingPolyTree) FixupFirstLefts2(outRec2, outRec1);
+
+        if ((outRec2->IsHole ^ m_ReverseOutput) == (Area(*outRec2) > 0))
+          ReversePolyPtLinks(outRec2->Pts);
+            
+      } else if (Poly2ContainsPoly1(outRec1->Pts, outRec2->Pts))
+      {
+        //outRec1 is contained by outRec2 ...
+        outRec2->IsHole = outRec1->IsHole;
+        outRec1->IsHole = !outRec2->IsHole;
+        outRec2->FirstLeft = outRec1->FirstLeft;
+        outRec1->FirstLeft = outRec2;
+
+        //fixup FirstLeft pointers that may need reassigning to OutRec1
+        if (m_UsingPolyTree) FixupFirstLefts2(outRec1, outRec2);
+
+        if ((outRec1->IsHole ^ m_ReverseOutput) == (Area(*outRec1) > 0))
+          ReversePolyPtLinks(outRec1->Pts);
+      } 
+      else
+      {
+        //the 2 polygons are completely separate ...
+        outRec2->IsHole = outRec1->IsHole;
+        outRec2->FirstLeft = outRec1->FirstLeft;
+
+        //fixup FirstLeft pointers that may need reassigning to OutRec2
+        if (m_UsingPolyTree) FixupFirstLefts1(outRec1, outRec2);
+      }
+     
+    } else
+    {
+      //joined 2 polygons together ...
+
+      outRec2->Pts = 0;
+      outRec2->BottomPt = 0;
+      outRec2->Idx = outRec1->Idx;
+
+      outRec1->IsHole = holeStateRec->IsHole;
+      if (holeStateRec == outRec2) 
+        outRec1->FirstLeft = outRec2->FirstLeft;
+      outRec2->FirstLeft = outRec1;
+
+      //fixup FirstLeft pointers that may need reassigning to OutRec1
+      if (m_UsingPolyTree) FixupFirstLefts2(outRec2, outRec1);
+    }
+  }
+}
+
+//------------------------------------------------------------------------------
+// ClipperOffset support functions ...
+//------------------------------------------------------------------------------
+
+DoublePoint GetUnitNormal(const IntPoint &pt1, const IntPoint &pt2)
+{
+  if(pt2.X == pt1.X && pt2.Y == pt1.Y) 
+    return DoublePoint(0, 0);
+
+  double Dx = (double)(pt2.X - pt1.X);
+  double dy = (double)(pt2.Y - pt1.Y);
+  double f = 1 *1.0/ std::sqrt( Dx*Dx + dy*dy );
+  Dx *= f;
+  dy *= f;
+  return DoublePoint(dy, -Dx);
+}
+
+//------------------------------------------------------------------------------
+// ClipperOffset class
+//------------------------------------------------------------------------------
+
+ClipperOffset::ClipperOffset(double miterLimit, double arcTolerance)
+{
+  this->MiterLimit = miterLimit;
+  this->ArcTolerance = arcTolerance;
+  m_lowest.X = -1;
+}
+//------------------------------------------------------------------------------
+
+ClipperOffset::~ClipperOffset()
+{
+  Clear();
+}
+//------------------------------------------------------------------------------
+
+void ClipperOffset::Clear()
+{
+  for (int i = 0; i < m_polyNodes.ChildCount(); ++i)
+    delete m_polyNodes.Childs[i];
+  m_polyNodes.Childs.clear();
+  m_lowest.X = -1;
+}
+//------------------------------------------------------------------------------
+
+void ClipperOffset::AddPath(const Path& path, JoinType joinType, EndType endType)
+{
+  int highI = (int)path.size() - 1;
+  if (highI < 0) return;
+  PolyNode* newNode = new PolyNode();
+  newNode->m_jointype = joinType;
+  newNode->m_endtype = endType;
+
+  //strip duplicate points from path and also get index to the lowest point ...
+  if (endType == etClosedLine || endType == etClosedPolygon)
+    while (highI > 0 && path[0] == path[highI]) highI--;
+  newNode->Contour.reserve(highI + 1);
+  newNode->Contour.push_back(path[0]);
+  int j = 0, k = 0;
+  for (int i = 1; i <= highI; i++)
+    if (newNode->Contour[j] != path[i])
+    {
+      j++;
+      newNode->Contour.push_back(path[i]);
+      if (path[i].Y > newNode->Contour[k].Y ||
+        (path[i].Y == newNode->Contour[k].Y &&
+        path[i].X < newNode->Contour[k].X)) k = j;
+    }
+  if (endType == etClosedPolygon && j < 2)
+  {
+    delete newNode;
+    return;
+  }
+  m_polyNodes.AddChild(*newNode);
+
+  //if this path's lowest pt is lower than all the others then update m_lowest
+  if (endType != etClosedPolygon) return;
+  if (m_lowest.X < 0)
+    m_lowest = IntPoint(m_polyNodes.ChildCount() - 1, k);
+  else
+  {
+    IntPoint ip = m_polyNodes.Childs[(int)m_lowest.X]->Contour[(int)m_lowest.Y];
+    if (newNode->Contour[k].Y > ip.Y ||
+      (newNode->Contour[k].Y == ip.Y &&
+      newNode->Contour[k].X < ip.X))
+      m_lowest = IntPoint(m_polyNodes.ChildCount() - 1, k);
+  }
+}
+//------------------------------------------------------------------------------
+
+void ClipperOffset::AddPaths(const Paths& paths, JoinType joinType, EndType endType)
+{
+  for (Paths::size_type i = 0; i < paths.size(); ++i)
+    AddPath(paths[i], joinType, endType);
+}
+//------------------------------------------------------------------------------
+
+void ClipperOffset::FixOrientations()
+{
+  //fixup orientations of all closed paths if the orientation of the
+  //closed path with the lowermost vertex is wrong ...
+  if (m_lowest.X >= 0 && 
+    !Orientation(m_polyNodes.Childs[(int)m_lowest.X]->Contour))
+  {
+    for (int i = 0; i < m_polyNodes.ChildCount(); ++i)
+    {
+      PolyNode& node = *m_polyNodes.Childs[i];
+      if (node.m_endtype == etClosedPolygon ||
+        (node.m_endtype == etClosedLine && Orientation(node.Contour)))
+          ReversePath(node.Contour);
+    }
+  } else
+  {
+    for (int i = 0; i < m_polyNodes.ChildCount(); ++i)
+    {
+      PolyNode& node = *m_polyNodes.Childs[i];
+      if (node.m_endtype == etClosedLine && !Orientation(node.Contour))
+        ReversePath(node.Contour);
+    }
+  }
+}
+//------------------------------------------------------------------------------
+
+void ClipperOffset::Execute(Paths& solution, double delta)
+{
+  solution.clear();
+  FixOrientations();
+  DoOffset(delta);
+  
+  //now clean up 'corners' ...
+  Clipper clpr;
+  clpr.AddPaths(m_destPolys, ptSubject, true);
+  if (delta > 0)
+  {
+    clpr.Execute(ctUnion, solution, pftPositive, pftPositive);
+  }
+  else
+  {
+    IntRect r = clpr.GetBounds();
+    Path outer(4);
+    outer[0] = IntPoint(r.left - 10, r.bottom + 10);
+    outer[1] = IntPoint(r.right + 10, r.bottom + 10);
+    outer[2] = IntPoint(r.right + 10, r.top - 10);
+    outer[3] = IntPoint(r.left - 10, r.top - 10);
+
+    clpr.AddPath(outer, ptSubject, true);
+    clpr.ReverseSolution(true);
+    clpr.Execute(ctUnion, solution, pftNegative, pftNegative);
+    if (solution.size() > 0) solution.erase(solution.begin());
+  }
+}
+//------------------------------------------------------------------------------
+
+void ClipperOffset::Execute(PolyTree& solution, double delta)
+{
+  solution.Clear();
+  FixOrientations();
+  DoOffset(delta);
+
+  //now clean up 'corners' ...
+  Clipper clpr;
+  clpr.AddPaths(m_destPolys, ptSubject, true);
+  if (delta > 0)
+  {
+    clpr.Execute(ctUnion, solution, pftPositive, pftPositive);
+  }
+  else
+  {
+    IntRect r = clpr.GetBounds();
+    Path outer(4);
+    outer[0] = IntPoint(r.left - 10, r.bottom + 10);
+    outer[1] = IntPoint(r.right + 10, r.bottom + 10);
+    outer[2] = IntPoint(r.right + 10, r.top - 10);
+    outer[3] = IntPoint(r.left - 10, r.top - 10);
+
+    clpr.AddPath(outer, ptSubject, true);
+    clpr.ReverseSolution(true);
+    clpr.Execute(ctUnion, solution, pftNegative, pftNegative);
+    //remove the outer PolyNode rectangle ...
+    if (solution.ChildCount() == 1 && solution.Childs[0]->ChildCount() > 0)
+    {
+      PolyNode* outerNode = solution.Childs[0];
+      solution.Childs.reserve(outerNode->ChildCount());
+      solution.Childs[0] = outerNode->Childs[0];
+      for (int i = 1; i < outerNode->ChildCount(); ++i)
+        solution.AddChild(*outerNode->Childs[i]);
+    }
+    else
+      solution.Clear();
+  }
+}
+//------------------------------------------------------------------------------
+
+void ClipperOffset::DoOffset(double delta)
+{
+  m_destPolys.clear();
+  m_delta = delta;
+
+  //if Zero offset, just copy any CLOSED polygons to m_p and return ...
+  if (NEAR_ZERO(delta)) 
+  {
+    m_destPolys.reserve(m_polyNodes.ChildCount());
+    for (int i = 0; i < m_polyNodes.ChildCount(); i++)
+    {
+      PolyNode& node = *m_polyNodes.Childs[i];
+      if (node.m_endtype == etClosedPolygon)
+        m_destPolys.push_back(node.Contour);
+    }
+    return;
+  }
+
+  //see offset_triginometry3.svg in the documentation folder ...
+  if (MiterLimit > 2) m_miterLim = 2/(MiterLimit * MiterLimit);
+  else m_miterLim = 0.5;
+
+  double y;
+  if (ArcTolerance <= 0.0) y = def_arc_tolerance;
+  else if (ArcTolerance > std::fabs(delta) * def_arc_tolerance) 
+    y = std::fabs(delta) * def_arc_tolerance;
+  else y = ArcTolerance;
+  //see offset_triginometry2.svg in the documentation folder ...
+  double steps = pi / std::acos(1 - y / std::fabs(delta));
+  if (steps > std::fabs(delta) * pi) 
+    steps = std::fabs(delta) * pi;  //ie excessive precision check
+  m_sin = std::sin(two_pi / steps);
+  m_cos = std::cos(two_pi / steps);
+  m_StepsPerRad = steps / two_pi;
+  if (delta < 0.0) m_sin = -m_sin;
+
+  m_destPolys.reserve(m_polyNodes.ChildCount() * 2);
+  for (int i = 0; i < m_polyNodes.ChildCount(); i++)
+  {
+    PolyNode& node = *m_polyNodes.Childs[i];
+    m_srcPoly = node.Contour;
+
+    int len = (int)m_srcPoly.size();
+    if (len == 0 || (delta <= 0 && (len < 3 || node.m_endtype != etClosedPolygon)))
+        continue;
+
+    m_destPoly.clear();
+    if (len == 1)
+    {
+      if (node.m_jointype == jtRound)
+      {
+        double X = 1.0, Y = 0.0;
+        for (cInt j = 1; j <= steps; j++)
+        {
+          m_destPoly.push_back(IntPoint(
+            Round(m_srcPoly[0].X + X * delta),
+            Round(m_srcPoly[0].Y + Y * delta)));
+          double X2 = X;
+          X = X * m_cos - m_sin * Y;
+          Y = X2 * m_sin + Y * m_cos;
+        }
+      }
+      else
+      {
+        double X = -1.0, Y = -1.0;
+        for (int j = 0; j < 4; ++j)
+        {
+          m_destPoly.push_back(IntPoint(
+            Round(m_srcPoly[0].X + X * delta),
+            Round(m_srcPoly[0].Y + Y * delta)));
+          if (X < 0) X = 1;
+          else if (Y < 0) Y = 1;
+          else X = -1;
+        }
+      }
+      m_destPolys.push_back(m_destPoly);
+      continue;
+    }
+    //build m_normals ...
+    m_normals.clear();
+    m_normals.reserve(len);
+    for (int j = 0; j < len - 1; ++j)
+      m_normals.push_back(GetUnitNormal(m_srcPoly[j], m_srcPoly[j + 1]));
+    if (node.m_endtype == etClosedLine || node.m_endtype == etClosedPolygon)
+      m_normals.push_back(GetUnitNormal(m_srcPoly[len - 1], m_srcPoly[0]));
+    else
+      m_normals.push_back(DoublePoint(m_normals[len - 2]));
+
+    if (node.m_endtype == etClosedPolygon)
+    {
+      int k = len - 1;
+      for (int j = 0; j < len; ++j)
+        OffsetPoint(j, k, node.m_jointype);
+      m_destPolys.push_back(m_destPoly);
+    }
+    else if (node.m_endtype == etClosedLine)
+    {
+      int k = len - 1;
+      for (int j = 0; j < len; ++j)
+        OffsetPoint(j, k, node.m_jointype);
+      m_destPolys.push_back(m_destPoly);
+      m_destPoly.clear();
+      //re-build m_normals ...
+      DoublePoint n = m_normals[len -1];
+      for (int j = len - 1; j > 0; j--)
+        m_normals[j] = DoublePoint(-m_normals[j - 1].X, -m_normals[j - 1].Y);
+      m_normals[0] = DoublePoint(-n.X, -n.Y);
+      k = 0;
+      for (int j = len - 1; j >= 0; j--)
+        OffsetPoint(j, k, node.m_jointype);
+      m_destPolys.push_back(m_destPoly);
+    }
+    else
+    {
+      int k = 0;
+      for (int j = 1; j < len - 1; ++j)
+        OffsetPoint(j, k, node.m_jointype);
+
+      IntPoint pt1;
+      if (node.m_endtype == etOpenButt)
+      {
+        int j = len - 1;
+        pt1 = IntPoint((cInt)Round(m_srcPoly[j].X + m_normals[j].X *
+          delta), (cInt)Round(m_srcPoly[j].Y + m_normals[j].Y * delta));
+        m_destPoly.push_back(pt1);
+        pt1 = IntPoint((cInt)Round(m_srcPoly[j].X - m_normals[j].X *
+          delta), (cInt)Round(m_srcPoly[j].Y - m_normals[j].Y * delta));
+        m_destPoly.push_back(pt1);
+      }
+      else
+      {
+        int j = len - 1;
+        k = len - 2;
+        m_sinA = 0;
+        m_normals[j] = DoublePoint(-m_normals[j].X, -m_normals[j].Y);
+        if (node.m_endtype == etOpenSquare)
+          DoSquare(j, k);
+        else
+          DoRound(j, k);
+      }
+
+      //re-build m_normals ...
+      for (int j = len - 1; j > 0; j--)
+        m_normals[j] = DoublePoint(-m_normals[j - 1].X, -m_normals[j - 1].Y);
+      m_normals[0] = DoublePoint(-m_normals[1].X, -m_normals[1].Y);
+
+      k = len - 1;
+      for (int j = k - 1; j > 0; --j) OffsetPoint(j, k, node.m_jointype);
+
+      if (node.m_endtype == etOpenButt)
+      {
+        pt1 = IntPoint((cInt)Round(m_srcPoly[0].X - m_normals[0].X * delta),
+          (cInt)Round(m_srcPoly[0].Y - m_normals[0].Y * delta));
+        m_destPoly.push_back(pt1);
+        pt1 = IntPoint((cInt)Round(m_srcPoly[0].X + m_normals[0].X * delta),
+          (cInt)Round(m_srcPoly[0].Y + m_normals[0].Y * delta));
+        m_destPoly.push_back(pt1);
+      }
+      else
+      {
+        k = 1;
+        m_sinA = 0;
+        if (node.m_endtype == etOpenSquare)
+          DoSquare(0, 1);
+        else
+          DoRound(0, 1);
+      }
+      m_destPolys.push_back(m_destPoly);
+    }
+  }
+}
+//------------------------------------------------------------------------------
+
+void ClipperOffset::OffsetPoint(int j, int& k, JoinType jointype)
+{
+  //cross product ...
+  m_sinA = (m_normals[k].X * m_normals[j].Y - m_normals[j].X * m_normals[k].Y);
+  if (std::fabs(m_sinA * m_delta) < 1.0) 
+  {
+    //dot product ...
+    double cosA = (m_normals[k].X * m_normals[j].X + m_normals[j].Y * m_normals[k].Y ); 
+    if (cosA > 0) // angle => 0 degrees
+    {
+      m_destPoly.push_back(IntPoint(Round(m_srcPoly[j].X + m_normals[k].X * m_delta),
+        Round(m_srcPoly[j].Y + m_normals[k].Y * m_delta)));
+      return; 
+    }
+    //else angle => 180 degrees   
+  }
+  else if (m_sinA > 1.0) m_sinA = 1.0;
+  else if (m_sinA < -1.0) m_sinA = -1.0;
+
+  if (m_sinA * m_delta < 0)
+  {
+    m_destPoly.push_back(IntPoint(Round(m_srcPoly[j].X + m_normals[k].X * m_delta),
+      Round(m_srcPoly[j].Y + m_normals[k].Y * m_delta)));
+    m_destPoly.push_back(m_srcPoly[j]);
+    m_destPoly.push_back(IntPoint(Round(m_srcPoly[j].X + m_normals[j].X * m_delta),
+      Round(m_srcPoly[j].Y + m_normals[j].Y * m_delta)));
+  }
+  else
+    switch (jointype)
+    {
+      case jtMiter:
+        {
+          double r = 1 + (m_normals[j].X * m_normals[k].X +
+            m_normals[j].Y * m_normals[k].Y);
+          if (r >= m_miterLim) DoMiter(j, k, r); else DoSquare(j, k);
+          break;
+        }
+      case jtSquare: DoSquare(j, k); break;
+      case jtRound: DoRound(j, k); break;
+    }
+  k = j;
+}
+//------------------------------------------------------------------------------
+
+void ClipperOffset::DoSquare(int j, int k)
+{
+  double dx = std::tan(std::atan2(m_sinA,
+      m_normals[k].X * m_normals[j].X + m_normals[k].Y * m_normals[j].Y) / 4);
+  m_destPoly.push_back(IntPoint(
+      Round(m_srcPoly[j].X + m_delta * (m_normals[k].X - m_normals[k].Y * dx)),
+      Round(m_srcPoly[j].Y + m_delta * (m_normals[k].Y + m_normals[k].X * dx))));
+  m_destPoly.push_back(IntPoint(
+      Round(m_srcPoly[j].X + m_delta * (m_normals[j].X + m_normals[j].Y * dx)),
+      Round(m_srcPoly[j].Y + m_delta * (m_normals[j].Y - m_normals[j].X * dx))));
+}
+//------------------------------------------------------------------------------
+
+void ClipperOffset::DoMiter(int j, int k, double r)
+{
+  double q = m_delta / r;
+  m_destPoly.push_back(IntPoint(Round(m_srcPoly[j].X + (m_normals[k].X + m_normals[j].X) * q),
+      Round(m_srcPoly[j].Y + (m_normals[k].Y + m_normals[j].Y) * q)));
+}
+//------------------------------------------------------------------------------
+
+void ClipperOffset::DoRound(int j, int k)
+{
+  double a = std::atan2(m_sinA,
+  m_normals[k].X * m_normals[j].X + m_normals[k].Y * m_normals[j].Y);
+  int steps = (int)Round(m_StepsPerRad * std::fabs(a));
+
+  double X = m_normals[k].X, Y = m_normals[k].Y, X2;
+  for (int i = 0; i < steps; ++i)
+  {
+    m_destPoly.push_back(IntPoint(
+        Round(m_srcPoly[j].X + X * m_delta),
+        Round(m_srcPoly[j].Y + Y * m_delta)));
+    X2 = X;
+    X = X * m_cos - m_sin * Y;
+    Y = X2 * m_sin + Y * m_cos;
+  }
+  m_destPoly.push_back(IntPoint(
+  Round(m_srcPoly[j].X + m_normals[j].X * m_delta),
+  Round(m_srcPoly[j].Y + m_normals[j].Y * m_delta)));
+}
+
+//------------------------------------------------------------------------------
+// Miscellaneous public functions
+//------------------------------------------------------------------------------
+
+void Clipper::DoSimplePolygons()
+{
+  PolyOutList::size_type i = 0;
+  while (i < m_PolyOuts.size()) 
+  {
+    OutRec* outrec = m_PolyOuts[i++];
+    OutPt* op = outrec->Pts;
+    if (!op) continue;
+    do //for each Pt in Polygon until duplicate found do ...
+    {
+      OutPt* op2 = op->Next;
+      while (op2 != outrec->Pts) 
+      {
+        if ((op->Pt == op2->Pt) && op2->Next != op && op2->Prev != op) 
+        {
+          //split the polygon into two ...
+          OutPt* op3 = op->Prev;
+          OutPt* op4 = op2->Prev;
+          op->Prev = op4;
+          op4->Next = op;
+          op2->Prev = op3;
+          op3->Next = op2;
+
+          outrec->Pts = op;
+          OutRec* outrec2 = CreateOutRec();
+          outrec2->Pts = op2;
+          UpdateOutPtIdxs(*outrec2);
+          if (Poly2ContainsPoly1(outrec2->Pts, outrec->Pts))
+          {
+            //OutRec2 is contained by OutRec1 ...
+            outrec2->IsHole = !outrec->IsHole;
+            outrec2->FirstLeft = outrec;
+            if (m_UsingPolyTree) FixupFirstLefts2(outrec2, outrec);
+          }
+          else
+            if (Poly2ContainsPoly1(outrec->Pts, outrec2->Pts))
+          {
+            //OutRec1 is contained by OutRec2 ...
+            outrec2->IsHole = outrec->IsHole;
+            outrec->IsHole = !outrec2->IsHole;
+            outrec2->FirstLeft = outrec->FirstLeft;
+            outrec->FirstLeft = outrec2;
+            if (m_UsingPolyTree) FixupFirstLefts2(outrec, outrec2);
+            }
+            else
+          {
+            //the 2 polygons are separate ...
+            outrec2->IsHole = outrec->IsHole;
+            outrec2->FirstLeft = outrec->FirstLeft;
+            if (m_UsingPolyTree) FixupFirstLefts1(outrec, outrec2);
+            }
+          op2 = op; //ie get ready for the Next iteration
+        }
+        op2 = op2->Next;
+      }
+      op = op->Next;
+    }
+    while (op != outrec->Pts);
+  }
+}
+//------------------------------------------------------------------------------
+
+void ReversePath(Path& p)
+{
+  std::reverse(p.begin(), p.end());
+}
+//------------------------------------------------------------------------------
+
+void ReversePaths(Paths& p)
+{
+  for (Paths::size_type i = 0; i < p.size(); ++i)
+    ReversePath(p[i]);
+}
+//------------------------------------------------------------------------------
+
+void SimplifyPolygon(const Path &in_poly, Paths &out_polys, PolyFillType fillType)
+{
+  Clipper c;
+  c.StrictlySimple(true);
+  c.AddPath(in_poly, ptSubject, true);
+  c.Execute(ctUnion, out_polys, fillType, fillType);
+}
+//------------------------------------------------------------------------------
+
+void SimplifyPolygons(const Paths &in_polys, Paths &out_polys, PolyFillType fillType)
+{
+  Clipper c;
+  c.StrictlySimple(true);
+  c.AddPaths(in_polys, ptSubject, true);
+  c.Execute(ctUnion, out_polys, fillType, fillType);
+}
+//------------------------------------------------------------------------------
+
+void SimplifyPolygons(Paths &polys, PolyFillType fillType)
+{
+  SimplifyPolygons(polys, polys, fillType);
+}
+//------------------------------------------------------------------------------
+
+inline double DistanceSqrd(const IntPoint& pt1, const IntPoint& pt2)
+{
+  double Dx = ((double)pt1.X - pt2.X);
+  double dy = ((double)pt1.Y - pt2.Y);
+  return (Dx*Dx + dy*dy);
+}
+//------------------------------------------------------------------------------
+
+double DistanceFromLineSqrd(
+  const IntPoint& pt, const IntPoint& ln1, const IntPoint& ln2)
+{
+  //The equation of a line in general form (Ax + By + C = 0)
+  //given 2 points (x¹,y¹) & (x²,y²) is ...
+  //(y¹ - y²)x + (x² - x¹)y + (y² - y¹)x¹ - (x² - x¹)y¹ = 0
+  //A = (y¹ - y²); B = (x² - x¹); C = (y² - y¹)x¹ - (x² - x¹)y¹
+  //perpendicular distance of point (x³,y³) = (Ax³ + By³ + C)/Sqrt(A² + B²)
+  //see http://en.wikipedia.org/wiki/Perpendicular_distance
+  double A = double(ln1.Y - ln2.Y);
+  double B = double(ln2.X - ln1.X);
+  double C = A * ln1.X  + B * ln1.Y;
+  C = A * pt.X + B * pt.Y - C;
+  return (C * C) / (A * A + B * B);
+}
+//---------------------------------------------------------------------------
+
+bool SlopesNearCollinear(const IntPoint& pt1, 
+    const IntPoint& pt2, const IntPoint& pt3, double distSqrd)
+{
+  //this function is more accurate when the point that's geometrically
+  //between the other 2 points is the one that's tested for distance.
+  //ie makes it more likely to pick up 'spikes' ...
+	if (Abs(pt1.X - pt2.X) > Abs(pt1.Y - pt2.Y))
+	{
+    if ((pt1.X > pt2.X) == (pt1.X < pt3.X))
+      return DistanceFromLineSqrd(pt1, pt2, pt3) < distSqrd;
+    else if ((pt2.X > pt1.X) == (pt2.X < pt3.X))
+      return DistanceFromLineSqrd(pt2, pt1, pt3) < distSqrd;
+		else
+	    return DistanceFromLineSqrd(pt3, pt1, pt2) < distSqrd;
+	}
+	else
+	{
+    if ((pt1.Y > pt2.Y) == (pt1.Y < pt3.Y))
+      return DistanceFromLineSqrd(pt1, pt2, pt3) < distSqrd;
+    else if ((pt2.Y > pt1.Y) == (pt2.Y < pt3.Y))
+      return DistanceFromLineSqrd(pt2, pt1, pt3) < distSqrd;
+		else
+      return DistanceFromLineSqrd(pt3, pt1, pt2) < distSqrd;
+	}
+}
+//------------------------------------------------------------------------------
+
+bool PointsAreClose(IntPoint pt1, IntPoint pt2, double distSqrd)
+{
+    double Dx = (double)pt1.X - pt2.X;
+    double dy = (double)pt1.Y - pt2.Y;
+    return ((Dx * Dx) + (dy * dy) <= distSqrd);
+}
+//------------------------------------------------------------------------------
+
+OutPt* ExcludeOp(OutPt* op)
+{
+  OutPt* result = op->Prev;
+  result->Next = op->Next;
+  op->Next->Prev = result;
+  result->Idx = 0;
+  return result;
+}
+//------------------------------------------------------------------------------
+
+void CleanPolygon(const Path& in_poly, Path& out_poly, double distance)
+{
+  //distance = proximity in units/pixels below which vertices
+  //will be stripped. Default ~= sqrt(2).
+  
+  size_t size = in_poly.size();
+  
+  if (size == 0) 
+  {
+    out_poly.clear();
+    return;
+  }
+
+  OutPt* outPts = new OutPt[size];
+  for (size_t i = 0; i < size; ++i)
+  {
+    outPts[i].Pt = in_poly[i];
+    outPts[i].Next = &outPts[(i + 1) % size];
+    outPts[i].Next->Prev = &outPts[i];
+    outPts[i].Idx = 0;
+  }
+
+  double distSqrd = distance * distance;
+  OutPt* op = &outPts[0];
+  while (op->Idx == 0 && op->Next != op->Prev) 
+  {
+    if (PointsAreClose(op->Pt, op->Prev->Pt, distSqrd))
+    {
+      op = ExcludeOp(op);
+      size--;
+    } 
+    else if (PointsAreClose(op->Prev->Pt, op->Next->Pt, distSqrd))
+    {
+      ExcludeOp(op->Next);
+      op = ExcludeOp(op);
+      size -= 2;
+    }
+    else if (SlopesNearCollinear(op->Prev->Pt, op->Pt, op->Next->Pt, distSqrd))
+    {
+      op = ExcludeOp(op);
+      size--;
+    }
+    else
+    {
+      op->Idx = 1;
+      op = op->Next;
+    }
+  }
+
+  if (size < 3) size = 0;
+  out_poly.resize(size);
+  for (size_t i = 0; i < size; ++i)
+  {
+    out_poly[i] = op->Pt;
+    op = op->Next;
+  }
+  delete [] outPts;
+}
+//------------------------------------------------------------------------------
+
+void CleanPolygon(Path& poly, double distance)
+{
+  CleanPolygon(poly, poly, distance);
+}
+//------------------------------------------------------------------------------
+
+void CleanPolygons(const Paths& in_polys, Paths& out_polys, double distance)
+{
+  for (Paths::size_type i = 0; i < in_polys.size(); ++i)
+    CleanPolygon(in_polys[i], out_polys[i], distance);
+}
+//------------------------------------------------------------------------------
+
+void CleanPolygons(Paths& polys, double distance)
+{
+  CleanPolygons(polys, polys, distance);
+}
+//------------------------------------------------------------------------------
+
+void Minkowski(const Path& poly, const Path& path, 
+  Paths& solution, bool isSum, bool isClosed)
+{
+  int delta = (isClosed ? 1 : 0);
+  size_t polyCnt = poly.size();
+  size_t pathCnt = path.size();
+  Paths pp;
+  pp.reserve(pathCnt);
+  if (isSum)
+    for (size_t i = 0; i < pathCnt; ++i)
+    {
+      Path p;
+      p.reserve(polyCnt);
+      for (size_t j = 0; j < poly.size(); ++j)
+        p.push_back(IntPoint(path[i].X + poly[j].X, path[i].Y + poly[j].Y));
+      pp.push_back(p);
+    }
+  else
+    for (size_t i = 0; i < pathCnt; ++i)
+    {
+      Path p;
+      p.reserve(polyCnt);
+      for (size_t j = 0; j < poly.size(); ++j)
+        p.push_back(IntPoint(path[i].X - poly[j].X, path[i].Y - poly[j].Y));
+      pp.push_back(p);
+    }
+
+  solution.clear();
+  solution.reserve((pathCnt + delta) * (polyCnt + 1));
+  for (size_t i = 0; i < pathCnt - 1 + delta; ++i)
+    for (size_t j = 0; j < polyCnt; ++j)
+    {
+      Path quad;
+      quad.reserve(4);
+      quad.push_back(pp[i % pathCnt][j % polyCnt]);
+      quad.push_back(pp[(i + 1) % pathCnt][j % polyCnt]);
+      quad.push_back(pp[(i + 1) % pathCnt][(j + 1) % polyCnt]);
+      quad.push_back(pp[i % pathCnt][(j + 1) % polyCnt]);
+      if (!Orientation(quad)) ReversePath(quad);
+      solution.push_back(quad);
+    }
+}
+//------------------------------------------------------------------------------
+
+void MinkowskiSum(const Path& pattern, const Path& path, Paths& solution, bool pathIsClosed)
+{
+  Minkowski(pattern, path, solution, true, pathIsClosed);
+  Clipper c;
+  c.AddPaths(solution, ptSubject, true);
+  c.Execute(ctUnion, solution, pftNonZero, pftNonZero);
+}
+//------------------------------------------------------------------------------
+
+void TranslatePath(const Path& input, Path& output, IntPoint delta) 
+{
+  //precondition: input != output
+  output.resize(input.size());
+  for (size_t i = 0; i < input.size(); ++i)
+    output[i] = IntPoint(input[i].X + delta.X, input[i].Y + delta.Y);
+}
+//------------------------------------------------------------------------------
+
+void MinkowskiSum(const Path& pattern, const Paths& paths, Paths& solution, bool pathIsClosed)
+{
+  Clipper c;
+  for (size_t i = 0; i < paths.size(); ++i)
+  {
+    Paths tmp;
+    Minkowski(pattern, paths[i], tmp, true, pathIsClosed);
+    c.AddPaths(tmp, ptSubject, true);
+    if (pathIsClosed)
+    {
+      Path tmp2;
+      TranslatePath(paths[i], tmp2, pattern[0]);
+      c.AddPath(tmp2, ptClip, true);
+    }
+  }
+    c.Execute(ctUnion, solution, pftNonZero, pftNonZero);
+}
+//------------------------------------------------------------------------------
+
+void MinkowskiDiff(const Path& poly1, const Path& poly2, Paths& solution)
+{
+  Minkowski(poly1, poly2, solution, false, true);
+  Clipper c;
+  c.AddPaths(solution, ptSubject, true);
+  c.Execute(ctUnion, solution, pftNonZero, pftNonZero);
+}
+//------------------------------------------------------------------------------
+
+enum NodeType {ntAny, ntOpen, ntClosed};
+
+void AddPolyNodeToPaths(const PolyNode& polynode, NodeType nodetype, Paths& paths)
+{
+  bool match = true;
+  if (nodetype == ntClosed) match = !polynode.IsOpen();
+  else if (nodetype == ntOpen) return;
+
+  if (!polynode.Contour.empty() && match)
+    paths.push_back(polynode.Contour);
+  for (int i = 0; i < polynode.ChildCount(); ++i)
+    AddPolyNodeToPaths(*polynode.Childs[i], nodetype, paths);
+}
+//------------------------------------------------------------------------------
+
+void PolyTreeToPaths(const PolyTree& polytree, Paths& paths)
+{
+  paths.resize(0); 
+  paths.reserve(polytree.Total());
+  AddPolyNodeToPaths(polytree, ntAny, paths);
+}
+//------------------------------------------------------------------------------
+
+void ClosedPathsFromPolyTree(const PolyTree& polytree, Paths& paths)
+{
+  paths.resize(0); 
+  paths.reserve(polytree.Total());
+  AddPolyNodeToPaths(polytree, ntClosed, paths);
+}
+//------------------------------------------------------------------------------
+
+void OpenPathsFromPolyTree(PolyTree& polytree, Paths& paths)
+{
+  paths.resize(0); 
+  paths.reserve(polytree.Total());
+  //Open paths are top level only, so ...
+  for (int i = 0; i < polytree.ChildCount(); ++i)
+    if (polytree.Childs[i]->IsOpen())
+      paths.push_back(polytree.Childs[i]->Contour);
+}
+//------------------------------------------------------------------------------
+
+std::ostream& operator <<(std::ostream &s, const IntPoint &p)
+{
+  s << "(" << p.X << "," << p.Y << ")";
+  return s;
+}
+//------------------------------------------------------------------------------
+
+std::ostream& operator <<(std::ostream &s, const Path &p)
+{
+  if (p.empty()) return s;
+  Path::size_type last = p.size() -1;
+  for (Path::size_type i = 0; i < last; i++)
+    s << "(" << p[i].X << "," << p[i].Y << "), ";
+  s << "(" << p[last].X << "," << p[last].Y << ")\n";
+  return s;
+}
+//------------------------------------------------------------------------------
+
+std::ostream& operator <<(std::ostream &s, const Paths &p)
+{
+  for (Paths::size_type i = 0; i < p.size(); i++)
+    s << p[i];
+  s << "\n";
+  return s;
+}
+//------------------------------------------------------------------------------
+
+#ifdef use_deprecated
+
+void OffsetPaths(const Paths &in_polys, Paths &out_polys,
+  double delta, JoinType jointype, EndType_ endtype, double limit)
+{
+  ClipperOffset co(limit, limit);
+  co.AddPaths(in_polys, jointype, (EndType)endtype); 
+  co.Execute(out_polys, delta);
+}
+//------------------------------------------------------------------------------
+
+#endif
+
+
+} //ClipperLib namespace
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.8/clipper/clipper.hpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/clipper/clipper.hpp
new file mode 100644
index 00000000000..a00ce41b20d
--- /dev/null
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/clipper/clipper.hpp
@@ -0,0 +1,438 @@
+/*******************************************************************************

+*                                                                              *

+* Author    :  Angus Johnson                                                   *

+* Version   :  6.1.5                                                           *

+* Date      :  16 July 2014                                                    *

+* Website   :  http://www.angusj.com                                           *

+* Copyright :  Angus Johnson 2010-2014                                         *

+*                                                                              *

+* License:                                                                     *

+* Use, modification & distribution is subject to Boost Software License Ver 1. *

+* http://www.boost.org/LICENSE_1_0.txt                                         *

+*                                                                              *

+* Attributions:                                                                *

+* The code in this library is an extension of Bala Vatti's clipping algorithm: *

+* "A generic solution to polygon clipping"                                     *

+* Communications of the ACM, Vol 35, Issue 7 (July 1992) pp 56-63.             *

+* http://portal.acm.org/citation.cfm?id=129906                                 *

+*                                                                              *

+* Computer graphics and geometric modeling: implementation and algorithms      *

+* By Max K. Agoston                                                            *

+* Springer; 1 edition (January 4, 2005)                                        *

+* http://books.google.com/books?q=vatti+clipping+agoston                       *

+*                                                                              *

+* See also:                                                                    *

+* "Polygon Offsetting by Computing Winding Numbers"                            *

+* Paper no. DETC2005-85513 pp. 565-575                                         *

+* ASME 2005 International Design Engineering Technical Conferences             *

+* and Computers and Information in Engineering Conference (IDETC/CIE2005)      *

+* September 24-28, 2005 , Long Beach, California, USA                          *

+* http://www.me.berkeley.edu/~mcmains/pubs/DAC05OffsetPolygon.pdf              *

+*                                                                              *

+*******************************************************************************/

+

+#ifndef clipper_hpp

+#define clipper_hpp

+

+#define CLIPPER_VERSION "6.1.5"

+

+//use_int32: When enabled 32bit ints are used instead of 64bit ints. This

+//improve performance but coordinate values are limited to the range +/- 46340

+//#define use_int32

+

+//use_xyz: adds a Z member to IntPoint. Adds a minor cost to perfomance.

+#define use_xyz

+

+//use_lines: Enables line clipping. Adds a very minor cost to performance.

+#define use_lines

+  

+//use_deprecated: Enables support for the obsolete OffsetPaths() function

+//which has been replace with the ClipperOffset class.

+//#define use_deprecated

+

+#include <vector>

+#include <set>

+#include <stdexcept>

+#include <cstring>

+#include <cstdlib>

+#include <ostream>

+#include <functional>

+#include <queue>

+#include "../src/types.h"

+

+namespace ClipperLib {

+

+enum ClipType { ctIntersection, ctUnion, ctDifference, ctXor };

+enum PolyType { ptSubject, ptClip };

+//By far the most widely used winding rules for polygon filling are

+//EvenOdd & NonZero (GDI, GDI+, XLib, OpenGL, Cairo, AGG, Quartz, SVG, Gr32)

+//Others rules include Positive, Negative and ABS_GTR_EQ_TWO (only in OpenGL)

+//see http://glprogramming.com/red/chapter11.html

+enum PolyFillType { pftEvenOdd, pftNonZero, pftPositive, pftNegative };

+

+struct ZLabel {

+	ZLabel () : id(0), t(0) {}

+	ZLabel (Int32 ii) : id(ii), t(0) {}

+	ZLabel (Int32 ii, double tt) : id(ii), t(tt) {}

+	bool operator == (const ZLabel &l) const {return id == l.id;}

+	Int32 id;

+	double t;

+};

+

+inline std::ostream& operator << (std::ostream &os, const ZLabel &l) {

+	return os << l.id << ':' << l.t;

+}

+

+struct ZType {

+	ZType (UInt64 v) : label1(v >> 32), label2(v & 0xffffffff) {}

+	ZType (Int32 id1, Int32 id2) : label1(id1), label2(id2) {}

+	ZType (const ZLabel &l1, const ZLabel &l2) : label1(l1), label2(l2) {}

+	const ZLabel& minLabel () const {return (label1.id < label2.id) ? label1 : label2;}

+	const ZLabel& maxLabel () const {return (label1.id > label2.id) ? label1 : label2;}

+

+	const ZLabel& otherLabel (const ZLabel &l) const {

+		return (l.id == label1.id && l.t == label1.t) ? label2 : label1;

+	}

+

+	bool operator == (const ZType &p) const {return minLabel() == p.minLabel() && maxLabel() == p.maxLabel();}

+	operator UInt64 () const {return (UInt64(label1.id) << 32) & label2.id;}

+	ZLabel label1, label2;

+};

+

+inline std::ostream& operator << (std::ostream &os, const ZType &z) {

+	return os << '[' << z.label1 << '|' << z.label2 << ']';

+}

+

+#ifdef use_int32

+  typedef int cInt;

+  static cInt const loRange = 46340;

+  static cInt const hiRange = 46340;

+#else

+  typedef Int64 cInt;

+  static cInt const loRange = 0x3FFFFFFF;

+  static cInt const hiRange = 0x3FFFFFFFFFFFFFFFLL;

+  typedef signed long long long64;     //used by Int128 class

+  typedef unsigned long long ulong64;

+

+#endif

+

+struct IntPoint {

+  cInt X;

+  cInt Y;

+#ifdef use_xyz

+  ZType Z;

+  IntPoint(cInt x = 0, cInt y = 0, ZType z = 0): X(x), Y(y), Z(z) {};

+#else

+  IntPoint(cInt x = 0, cInt y = 0): X(x), Y(y) {};

+#endif

+

+  friend inline bool operator== (const IntPoint& a, const IntPoint& b)

+  {

+    return a.X == b.X && a.Y == b.Y;

+  }

+  friend inline bool operator!= (const IntPoint& a, const IntPoint& b)

+  {

+    return a.X != b.X  || a.Y != b.Y; 

+  }

+};

+//------------------------------------------------------------------------------

+

+typedef std::vector< IntPoint > Path;

+typedef std::vector< Path > Paths;

+

+inline Path& operator <<(Path& poly, const IntPoint& p) {poly.push_back(p); return poly;}

+inline Paths& operator <<(Paths& polys, const Path& p) {polys.push_back(p); return polys;}

+

+std::ostream& operator <<(std::ostream &s, const IntPoint &p);

+std::ostream& operator <<(std::ostream &s, const Path &p);

+std::ostream& operator <<(std::ostream &s, const Paths &p);

+

+struct DoublePoint

+{

+  double X;

+  double Y;

+  DoublePoint(double x = 0, double y = 0) : X(x), Y(y) {}

+  DoublePoint(IntPoint ip) : X((double)ip.X), Y((double)ip.Y) {}

+};

+//------------------------------------------------------------------------------

+

+#ifdef use_xyz

+typedef void (*TZFillCallback)(IntPoint& e1bot, IntPoint& e1top, IntPoint& e2bot, IntPoint& e2top, IntPoint& pt);

+#endif

+

+enum InitOptions {ioReverseSolution = 1, ioStrictlySimple = 2, ioPreserveCollinear = 4};

+enum JoinType {jtSquare, jtRound, jtMiter};

+enum EndType {etClosedPolygon, etClosedLine, etOpenButt, etOpenSquare, etOpenRound};

+#ifdef use_deprecated

+  enum EndType_ {etClosed, etButt = 2, etSquare, etRound};

+#endif

+

+class PolyNode;

+typedef std::vector< PolyNode* > PolyNodes;

+

+class PolyNode 

+{ 

+public:

+    PolyNode();

+	 virtual ~PolyNode () {}

+    Path Contour;

+    PolyNodes Childs;

+    PolyNode* Parent;

+    PolyNode* GetNext() const;

+    bool IsHole() const;

+    bool IsOpen() const;

+    int ChildCount() const;

+private:

+    unsigned Index; //node index in Parent.Childs

+    bool m_IsOpen;

+    JoinType m_jointype;

+    EndType m_endtype;

+    PolyNode* GetNextSiblingUp() const;

+    void AddChild(PolyNode& child);

+    friend class Clipper; //to access Index

+    friend class ClipperOffset; 

+};

+

+class PolyTree: public PolyNode

+{ 

+public:

+    ~PolyTree(){Clear();};

+    PolyNode* GetFirst() const;

+    void Clear();

+    int Total() const;

+private:

+    PolyNodes AllNodes;

+    friend class Clipper; //to access AllNodes

+};

+

+bool Orientation(const Path &poly);

+double Area(const Path &poly);

+int PointInPolygon(const IntPoint &pt, const Path &path);

+

+#ifdef use_deprecated

+  void OffsetPaths(const Paths &in_polys, Paths &out_polys,

+    double delta, JoinType jointype, EndType_ endtype, double limit = 0);

+#endif

+

+void SimplifyPolygon(const Path &in_poly, Paths &out_polys, PolyFillType fillType = pftEvenOdd);

+void SimplifyPolygons(const Paths &in_polys, Paths &out_polys, PolyFillType fillType = pftEvenOdd);

+void SimplifyPolygons(Paths &polys, PolyFillType fillType = pftEvenOdd);

+

+void CleanPolygon(const Path& in_poly, Path& out_poly, double distance = 1.415);

+void CleanPolygon(Path& poly, double distance = 1.415);

+void CleanPolygons(const Paths& in_polys, Paths& out_polys, double distance = 1.415);

+void CleanPolygons(Paths& polys, double distance = 1.415);

+

+void MinkowskiSum(const Path& pattern, const Path& path, Paths& solution, bool pathIsClosed);

+void MinkowskiSum(const Path& pattern, const Paths& paths, Paths& solution, bool pathIsClosed);

+void MinkowskiDiff(const Path& poly1, const Path& poly2, Paths& solution);

+

+void PolyTreeToPaths(const PolyTree& polytree, Paths& paths);

+void ClosedPathsFromPolyTree(const PolyTree& polytree, Paths& paths);

+void OpenPathsFromPolyTree(PolyTree& polytree, Paths& paths);

+

+void ReversePath(Path& p);

+void ReversePaths(Paths& p);

+

+struct IntRect { cInt left; cInt top; cInt right; cInt bottom; };

+

+//enums that are used internally ...

+enum EdgeSide { esLeft = 1, esRight = 2};

+

+//forward declarations (for stuff used internally) ...

+struct TEdge;

+struct IntersectNode;

+struct LocalMinimum;

+struct Scanbeam;

+struct OutPt;

+struct OutRec;

+struct Join;

+

+typedef std::vector < OutRec* > PolyOutList;

+typedef std::vector < TEdge* > EdgeList;

+typedef std::vector < Join* > JoinList;

+typedef std::vector < IntersectNode* > IntersectList;

+

+//------------------------------------------------------------------------------

+

+//ClipperBase is the ancestor to the Clipper class. It should not be

+//instantiated directly. This class simply abstracts the conversion of sets of

+//polygon coordinates into edge objects that are stored in a LocalMinima list.

+class ClipperBase

+{

+public:

+  ClipperBase();

+  virtual ~ClipperBase();

+  bool AddPath(const Path &pg, PolyType PolyTyp, bool Closed);

+  bool AddPaths(const Paths &ppg, PolyType PolyTyp, bool Closed);

+  virtual void Clear();

+  IntRect GetBounds();

+  bool PreserveCollinear() {return m_PreserveCollinear;};

+  void PreserveCollinear(bool value) {m_PreserveCollinear = value;};

+protected:

+  void DisposeLocalMinimaList();

+  TEdge* AddBoundsToLML(TEdge *e, bool IsClosed);

+  void PopLocalMinima();

+  virtual void Reset();

+  TEdge* ProcessBound(TEdge* E, bool IsClockwise);

+  void DoMinimaLML(TEdge* E1, TEdge* E2, bool IsClosed);

+  TEdge* DescendToMin(TEdge *&E);

+  void AscendToMax(TEdge *&E, bool Appending, bool IsClosed);

+

+  typedef std::vector<LocalMinimum> MinimaList;

+  MinimaList::iterator m_CurrentLM;

+  MinimaList           m_MinimaList;

+

+  bool              m_UseFullRange;

+  EdgeList          m_edges;

+  bool             m_PreserveCollinear;

+  bool             m_HasOpenPaths;

+};

+//------------------------------------------------------------------------------

+

+class Clipper : public virtual ClipperBase

+{

+public:

+  Clipper(int initOptions = 0);

+  ~Clipper();

+  bool Execute(ClipType clipType,

+    Paths &solution,

+    PolyFillType subjFillType = pftEvenOdd,

+    PolyFillType clipFillType = pftEvenOdd);

+  bool Execute(ClipType clipType,

+    PolyTree &polytree,

+    PolyFillType subjFillType = pftEvenOdd,

+    PolyFillType clipFillType = pftEvenOdd);

+  bool ReverseSolution() {return m_ReverseOutput;};

+  void ReverseSolution(bool value) {m_ReverseOutput = value;};

+  bool StrictlySimple() {return m_StrictSimple;};

+  void StrictlySimple(bool value) {m_StrictSimple = value;};

+  //set the callback function for z value filling on intersections (otherwise Z is 0)

+#ifdef use_xyz

+  void ZFillFunction(TZFillCallback zFillFunc);

+#endif

+protected:

+  void Reset();

+  virtual bool ExecuteInternal();

+private:

+  PolyOutList       m_PolyOuts;

+  JoinList          m_Joins;

+  JoinList          m_GhostJoins;

+  IntersectList     m_IntersectList;

+  ClipType          m_ClipType;

+  typedef std::priority_queue<cInt> ScanbeamList;

+  ScanbeamList      m_Scanbeam;

+  TEdge           *m_ActiveEdges;

+  TEdge           *m_SortedEdges;

+  bool             m_ExecuteLocked;

+  PolyFillType     m_ClipFillType;

+  PolyFillType     m_SubjFillType;

+  bool             m_ReverseOutput;

+  bool             m_UsingPolyTree; 

+  bool             m_StrictSimple;

+#ifdef use_xyz

+  TZFillCallback   m_ZFill; //custom callback 

+#endif

+  void SetWindingCount(TEdge& edge);

+  bool IsEvenOddFillType(const TEdge& edge) const;

+  bool IsEvenOddAltFillType(const TEdge& edge) const;

+  void InsertScanbeam(const cInt Y);

+  cInt PopScanbeam();

+  void InsertLocalMinimaIntoAEL(const cInt botY);

+  void InsertEdgeIntoAEL(TEdge *edge, TEdge* startEdge);

+  void AddEdgeToSEL(TEdge *edge);

+  void CopyAELToSEL();

+  void DeleteFromSEL(TEdge *e);

+  void DeleteFromAEL(TEdge *e);

+  void UpdateEdgeIntoAEL(TEdge *&e);

+  void SwapPositionsInSEL(TEdge *edge1, TEdge *edge2);

+  bool IsContributing(const TEdge& edge) const;

+  bool IsTopHorz(const cInt XPos);

+  void SwapPositionsInAEL(TEdge *edge1, TEdge *edge2);

+  void DoMaxima(TEdge *e);

+  void ProcessHorizontals(bool IsTopOfScanbeam);

+  void ProcessHorizontal(TEdge *horzEdge, bool isTopOfScanbeam);

+  void AddLocalMaxPoly(TEdge *e1, TEdge *e2, const IntPoint &pt);

+  OutPt* AddLocalMinPoly(TEdge *e1, TEdge *e2, const IntPoint &pt);

+  OutRec* GetOutRec(int idx);

+  void AppendPolygon(TEdge *e1, TEdge *e2);

+  void IntersectEdges(TEdge *e1, TEdge *e2, IntPoint &pt);

+  OutRec* CreateOutRec();

+  OutPt* AddOutPt(TEdge *e, const IntPoint &pt);

+  void DisposeAllOutRecs();

+  void DisposeOutRec(PolyOutList::size_type index);

+  bool ProcessIntersections(const cInt botY, const cInt topY);

+  void BuildIntersectList(const cInt botY, const cInt topY);

+  void ProcessIntersectList();

+  void ProcessEdgesAtTopOfScanbeam(const cInt topY);

+  void BuildResult(Paths& polys);

+  void BuildResult2(PolyTree& polytree);

+  void SetHoleState(TEdge *e, OutRec *outrec);

+  void DisposeIntersectNodes();

+  bool FixupIntersectionOrder();

+  void FixupOutPolygon(OutRec &outrec);

+  bool IsHole(TEdge *e);

+  bool FindOwnerFromSplitRecs(OutRec &outRec, OutRec *&currOrfl);

+  void FixHoleLinkage(OutRec &outrec);

+  void AddJoin(OutPt *op1, OutPt *op2, const IntPoint offPt);

+  void ClearJoins();

+  void ClearGhostJoins();

+  void AddGhostJoin(OutPt *op, const IntPoint offPt);

+  bool JoinPoints(Join *j, OutRec* outRec1, OutRec* outRec2);

+  void JoinCommonEdges();

+  void DoSimplePolygons();

+  void FixupFirstLefts1(OutRec* OldOutRec, OutRec* NewOutRec);

+  void FixupFirstLefts2(OutRec* OldOutRec, OutRec* NewOutRec);

+#ifdef use_xyz

+  void SetZ(IntPoint& pt, TEdge& e1, TEdge& e2);

+#endif

+};

+//------------------------------------------------------------------------------

+

+class ClipperOffset 

+{

+public:

+  ClipperOffset(double miterLimit = 2.0, double roundPrecision = 0.25);

+  ~ClipperOffset();

+  void AddPath(const Path& path, JoinType joinType, EndType endType);

+  void AddPaths(const Paths& paths, JoinType joinType, EndType endType);

+  void Execute(Paths& solution, double delta);

+  void Execute(PolyTree& solution, double delta);

+  void Clear();

+  double MiterLimit;

+  double ArcTolerance;

+private:

+  Paths m_destPolys;

+  Path m_srcPoly;

+  Path m_destPoly;

+  std::vector<DoublePoint> m_normals;

+  double m_delta, m_sinA, m_sin, m_cos;

+  double m_miterLim, m_StepsPerRad;

+  IntPoint m_lowest;

+  PolyNode m_polyNodes;

+

+  void FixOrientations();

+  void DoOffset(double delta);

+  void OffsetPoint(int j, int& k, JoinType jointype);

+  void DoSquare(int j, int k);

+  void DoMiter(int j, int k, double r);

+  void DoRound(int j, int k);

+};

+//------------------------------------------------------------------------------

+

+class clipperException : public std::exception

+{

+  public:

+    clipperException(const char* description): m_descr(description) {}

+    virtual ~clipperException() throw() {}

+    virtual const char* what() const throw() {return m_descr.c_str();}

+  private:

+    std::string m_descr;

+};

+//------------------------------------------------------------------------------

+

+} //ClipperLib namespace

+

+#endif //clipper_hpp

+

+

diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/config.h.in b/Build/source/texk/dvisvgm/dvisvgm-1.8/config.h.in
index fcd8cf41872..fcd8cf41872 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/config.h.in
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/config.h.in
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/configure.ac b/Build/source/texk/dvisvgm/dvisvgm-1.8/configure.ac
index 95df7c0c223..f867c8754be 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/configure.ac
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/configure.ac
@@ -4,8 +4,8 @@
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ(2.59)
-AC_INIT([dvisvgm],[1.7],[martin.gieseking@uos.de])
-DATE="June 2014"
+AC_INIT([dvisvgm],[1.8],[martin.gieseking@uos.de])
+DATE="July 2014"
 AC_CONFIG_SRCDIR(src)
 AC_CONFIG_HEADER(config.h)
 AC_CANONICAL_HOST
@@ -146,6 +146,7 @@ if test "$withval" != no; then
 	fi
 fi
 
+
 # Check if the kpathsea headers are C++ safe
 AC_MSG_CHECKING([if the kpathsea headers are C++ safe])
 AC_LANG_PUSH([C++])
@@ -161,6 +162,6 @@ AC_SUBST(DATE)
 AC_SUBST(EXTRA_LIBS)
 AC_SUBST(AM_CPPFLAGS)
 AC_SUBST(AM_LDFLAGS)
-AC_CONFIG_FILES([Makefile src/Makefile tests/Makefile doc/dvisvgm.txt doc/Makefile])
+AC_CONFIG_FILES([Makefile clipper/Makefile src/Makefile tests/Makefile doc/dvisvgm.txt doc/Makefile])
 AC_OUTPUT
 
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/doc/Makefile.am b/Build/source/texk/dvisvgm/dvisvgm-1.8/doc/Makefile.am
index 13254cb773a..13254cb773a 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/doc/Makefile.am
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/doc/Makefile.am
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.8/doc/README b/Build/source/texk/dvisvgm/dvisvgm-1.8/doc/README
new file mode 100644
index 00000000000..4ceb62ce402
--- /dev/null
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/doc/README
@@ -0,0 +1,16 @@
+dvisvgm-1.7 (2014-06-18)
+- all DVI files are pre-processed now to allow the implementation of
+  advanced features that rely on data not available on the pages being
+  converted
+- added support for internal hyperref links across pages
+- added \special command dvisvgm:rawdef to insert raw SVG fragments to
+  the <defs> section
+- added the new \special commands dvisvgm:rawset, dvisvgm:endrawset, and
+  dvisvgm:rawput to assign and access a sequence of SVG fragments via an
+  identifier (LP feature request #1215878)
+- removed redundant <missing-glyph> elements from SVG files
+- fixed support of external fonts containing characters not mapped by the
+  embedded unicode tables (LP bug #1276689)
+- fixed incorrect extent values shown in conjunction with the preview package
+- many refactorings and code improvements
+
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/doc/dvisvgm.1 b/Build/source/texk/dvisvgm/dvisvgm-1.8/doc/dvisvgm.1
index bcacdfcd0c8..0aa592262ae 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/doc/dvisvgm.1
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/doc/dvisvgm.1
@@ -2,12 +2,12 @@
 .\"     Title: dvisvgm
 .\"    Author: Martin Gieseking <martin.gieseking@uos.de>
 .\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
-.\"      Date: 06/18/2014
+.\"      Date: 07/29/2014
 .\"    Manual: dvisvgm Manual
-.\"    Source: dvisvgm 1.7
+.\"    Source: dvisvgm 1.8
 .\"  Language: English
 .\"
-.TH "DVISVGM" "1" "06/18/2014" "dvisvgm 1\&.7" "dvisvgm Manual"
+.TH "DVISVGM" "1" "07/29/2014" "dvisvgm 1\&.8" "dvisvgm Manual"
 .\" -----------------------------------------------------------------
 .\" * Define some portability stuff
 .\" -----------------------------------------------------------------
@@ -185,6 +185,15 @@ to overwrite the default\&. Furthermore, it is also possible to disable the font
 is omitted, dvisvgm prints the path of the default cache directory together with further information about the stored fonts\&. Additionally, outdated and corrupted cache files are removed\&.
 .RE
 .PP
+\fB\-j, \-\-clipjoin\fR
+.RS 4
+This option tells dvisvgm to compute the intersection of clipping paths itself if necessary, and not to delegate this task to the SVG renderer\&. The resulting SVG files are more portable because some SVG renderers don\(cqt support intersections of clipping paths which are defined by
+\fIclipPath\fR
+elements that contain a
+\fIclip\-path\fR
+attribute\&.
+.RE
+.PP
 \fB\-\-color\fR
 .RS 4
 Enables colorization of messages printed during the conversion process\&. The colors can be customized via the environment variable
@@ -436,6 +445,13 @@ degrees around the page center\&. This option is equivalent to
 \fB\-TR\fR\fIangle\fR\&.
 .RE
 .PP
+\fB\-R, \-\-relative\fR
+.RS 4
+SVG allows to define graphics paths by a sequence of absolute and/or relative commands, i\&.e\&. each command expects either absolute coordinates or coordinates relative to the current drawing position\&. By default, dvisvgm creates paths made up of absolute commands\&. If option
+\fB\-\-relative\fR
+is given, relative commands are created instead which slightly reduces the size of the SVG files in most cases\&.
+.RE
+.PP
 \fB\-s, \-\-stdout\fR
 .RS 4
 Don\(cqt write the SVG output to a file but redirect it to
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/doc/dvisvgm.txt.in b/Build/source/texk/dvisvgm/dvisvgm-1.8/doc/dvisvgm.txt.in
index 29c4ce750b0..173b0e5d39a 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/doc/dvisvgm.txt.in
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/doc/dvisvgm.txt.in
@@ -137,6 +137,13 @@ dvisvgm prints the path of the default cache directory together with further inf
 Additionally, outdated and corrupted cache files are removed.
 
 
+*-j, --clipjoin*::
+This option tells dvisvgm to compute the intersection of clipping paths itself if necessary,
+and not to delegate this task to the SVG renderer. The resulting SVG files are more portable
+because some SVG renderers don't support intersections of clipping paths which are defined by
+'clipPath' elements that contain a 'clip-path' attribute.
+
+
 *--color*::
 Enables colorization of messages printed during the conversion process. The colors can be customized
 via the environment variable +DVISVGM_COLORS+. See the ENVIRONMENT section below for further information.
@@ -329,6 +336,14 @@ Rotates the page content clockwise by 'angle' degrees around the page center.
 This option is equivalent to *-TR*'angle'.
 
 
+*-R, --relative*::
+SVG allows to define graphics paths by a sequence of absolute and/or relative commands,
+i.e. each command expects either absolute coordinates or coordinates relative to the
+current drawing position. By default, dvisvgm creates paths made up of absolute commands.
+If option *--relative* is given, relative commands are created instead which slightly reduces
+the size of the SVG files in most cases.
+
+
 *-s, --stdout*::
 Don't write the SVG output to a file but redirect it to *stdout*.
 
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/BasicDVIReader.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/BasicDVIReader.cpp
index 155e729c2e9..155e729c2e9 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/BasicDVIReader.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/BasicDVIReader.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/BasicDVIReader.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/BasicDVIReader.h
index 0b810f6c1cd..0b810f6c1cd 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/BasicDVIReader.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/BasicDVIReader.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Bezier.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Bezier.cpp
new file mode 100644
index 00000000000..10201fa5062
--- /dev/null
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Bezier.cpp
@@ -0,0 +1,188 @@
+/*************************************************************************
+** Bezier.cpp                                                           **
+**                                                                      **
+** This file is part of dvisvgm -- the DVI to SVG converter             **
+** Copyright (C) 2005-2014 Martin Gieseking <martin.gieseking@uos.de>   **
+**                                                                      **
+** This program is free software; you can redistribute it and/or        **
+** modify it under the terms of the GNU General Public License as       **
+** published by the Free Software Foundation; either version 3 of       **
+** the License, or (at your option) any later version.                  **
+**                                                                      **
+** This program is distributed in the hope that it will be useful, but  **
+** WITHOUT ANY WARRANTY; without even the implied warranty of           **
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the         **
+** GNU General Public License for more details.                         **
+**                                                                      **
+** You should have received a copy of the GNU General Public License    **
+** along with this program; if not, see <http://www.gnu.org/licenses/>. **
+*************************************************************************/
+
+#include <utility>
+#include "Bezier.h"
+
+using namespace std;
+
+Bezier::Bezier () {
+	_points[0] = _points[1] = _points[2] = _points[3] = 0;
+}
+
+
+/** Creates a quadratic Bézier curve. internally, it's represented as a cubic one. */
+Bezier::Bezier (const DPair &p0, const DPair &p1, const DPair &p2) {
+	_points[0] = p0;
+	_points[1] = p0+(p1-p0)*2.0/3.0;
+	_points[2] = p2+(p1-p2)*2.0/3.0;
+	_points[3] = p2;
+}
+
+
+Bezier::Bezier (const DPair &p0, const DPair &p1, const DPair &p2, const DPair &p3) {
+	_points[0] = p0;
+	_points[1] = p1;
+	_points[2] = p2;
+	_points[3] = p3;
+}
+
+
+/** Creates a subcurve of a given Bézier curve.
+ *  @param[in] source original curve to be clipped
+ *  @param[in] t0 'time' parameter \f$\in[0,1]\f$ of source curve where the subcurve starts
+ *  @param[in] t1 'time' parameter \f$\in[0,1]\f$ of source curve where the subcurve ends */
+Bezier::Bezier (const Bezier &source, double t0, double t1) {
+	if (t0 == t1)
+		_points[0] = _points[1] = _points[2] = _points[3] = source.pointAt(t0);
+	else {
+		if (t0 > t1)
+			swap(t0, t1);
+		if (t0 == 0)
+			source.subdivide(t1, this, 0);
+		else if (t1 == 1)
+			source.subdivide(t0, 0, this);
+		else {
+			Bezier subcurve;
+			source.subdivide(t0, 0, &subcurve);
+			subcurve.subdivide((t1-t0)/(1-t0), this, 0);
+		}
+	}
+}
+
+
+void Bezier::reverse() {
+	swap(_points[0], _points[3]);
+	swap(_points[1], _points[2]);
+}
+
+
+DPair Bezier::pointAt (double t) const {
+	const double s = 1-t;
+	return _points[0]*s*s*s + _points[1]*3.0*s*s*t + _points[2]*3.0*s*t*t + _points[3]*t*t*t;
+}
+
+
+/** Splits the curve at t into two sub-curves. */
+void Bezier::subdivide (double t, Bezier *bezier1, Bezier *bezier2) const {
+	const double s = 1-t;
+	DPair p01   = _points[0]*s + _points[1]*t;
+	DPair p12   = _points[1]*s + _points[2]*t;
+	DPair p23   = _points[2]*s + _points[3]*t;
+	DPair p012  = p01*s + p12*t;
+	DPair p123  = p12*s + p23*t;
+	DPair p0123 = p012*s + p123*t;
+	if (bezier1) {
+		bezier1->_points[0] = _points[0];
+		bezier1->_points[1] = p01;
+		bezier1->_points[2] = p012;
+		bezier1->_points[3] = p0123;
+	}
+	if (bezier2) {
+		bezier2->_points[0] = p0123;
+		bezier2->_points[1] = p123;
+		bezier2->_points[2] = p23;
+		bezier2->_points[3] = _points[3];
+	}
+}
+
+
+/** Approximates the current Bézier curve by a sequence of line segments.
+ *  This is done by subdividing the curve several times using De Casteljau's algorithm.
+ *  If a sub-curve is almost flat, i.e. \f$\sum\limits_{k=0}^2 |p_{k+1}-p_k| - |p_3-p_0| < \delta\f$,
+ *  the curve is not further subdivided.
+ *  @param[in] delta threshold where to stop further subdivisions (see description above)
+ *  @param[out] p the resulting sequence of points defining the start/end points of the line segments
+ *  @param[out] t corresponding curve parameters of the approximated points p: \f$ b(t_i)=p_i \f$
+ *  @return number of points in vector p */
+int Bezier::approximate (double delta, std::vector<DPair> &p, vector<double> *t) const {
+	p.push_back(_points[0]);
+	if (t)
+		t->push_back(0);
+	return approximate(delta, 0, 1, p, t);
+}
+
+
+int Bezier::approximate (double delta, double t0, double t1, vector<DPair> &p, vector<double> *t) const {
+	// compute distance of adjacent control points
+	const double l01 = (_points[1]-_points[0]).length();
+	const double l12 = (_points[2]-_points[1]).length();
+	const double l23 = (_points[3]-_points[2]).length();
+	const double l03 = (_points[3]-_points[0]).length();
+	if (l01+l12+l23-l03 < delta) { // is curve flat enough?
+		p.push_back(_points[3]);    // => store endpoint
+		if (t)
+			t->push_back(t1);
+	}
+	else {
+		// subdivide curve at b(0.5) and approximate the resulting parts separately
+		Bezier b1, b2;
+		subdivide(0.5, &b1, &b2);
+		double tmid = (t0+t1)/2;
+		b1.approximate(delta, t0, tmid, p, t);
+		b2.approximate(delta, tmid, t1, p, t);
+	}
+	return p.size();
+}
+
+
+static inline double signed_area (const DPair &p1, const DPair &p2, const DPair &p3) {
+	return (p2.x()-p1.x())*(p3.y()-p1.y()) - (p3.x()-p1.x())*(p2.y()-p1.y());
+}
+
+
+static inline double dot_prod (const DPair &p1, const DPair &p2) {
+	return p1.x()*p2.x() + p1.y()*p2.y();
+}
+
+
+static bool between (const DPair &p1, const DPair &p2, const DPair &p3, double delta) {
+	if (fabs(signed_area(p1, p2, p3)) < delta) {
+		double dotp = dot_prod(p2-p1, p3-p1);
+		return dotp > 0 && dotp < dot_prod(p2-p1, p2-p1);
+	}
+	return false;
+}
+
+
+static inline bool near (const DPair &p1, const DPair &p2, double delta) {
+	DPair diff = p2-p1;
+	return fabs(diff.x()) < delta && fabs(diff.y()) < delta;
+}
+
+
+int Bezier::reduceDegree (double delta, vector<DPair> &p) const {
+	if (near(_points[0], _points[1], delta) && near(_points[0], _points[2], delta) && near(_points[0], _points[3], delta))
+		p.push_back(_points[0]);
+	else if (between(_points[0], _points[1], _points[3], delta) && between(_points[0], _points[2], _points[3], delta)) {
+		p.push_back(_points[1]);
+		p.push_back(_points[3]);
+	}
+	else if (near((_points[1]-_points[0])*1.5+_points[0], (_points[2]-_points[3])*1.5+_points[3], delta)) {
+		p.push_back(_points[0]);
+		p.push_back((_points[1]-_points[0])*1.5 + _points[0]);
+		p.push_back(_points[3]);
+	}
+	else {
+		for (int i=0; i < 4; i++)
+			p.push_back(p[i]);
+	}
+	return p.size()-1;
+}
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Bezier.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Bezier.h
new file mode 100644
index 00000000000..ee763ede172
--- /dev/null
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Bezier.h
@@ -0,0 +1,48 @@
+/*************************************************************************
+** Bezier.h                                                             **
+**                                                                      **
+** This file is part of dvisvgm -- the DVI to SVG converter             **
+** Copyright (C) 2005-2014 Martin Gieseking <martin.gieseking@uos.de>   **
+**                                                                      **
+** This program is free software; you can redistribute it and/or        **
+** modify it under the terms of the GNU General Public License as       **
+** published by the Free Software Foundation; either version 3 of       **
+** the License, or (at your option) any later version.                  **
+**                                                                      **
+** This program is distributed in the hope that it will be useful, but  **
+** WITHOUT ANY WARRANTY; without even the implied warranty of           **
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the         **
+** GNU General Public License for more details.                         **
+**                                                                      **
+** You should have received a copy of the GNU General Public License    **
+** along with this program; if not, see <http://www.gnu.org/licenses/>. **
+*************************************************************************/
+
+#ifndef DVISVGM_BEZIER_H
+#define DVISVGM_BEZIER_H
+
+#include <vector>
+#include "Pair.h"
+
+class Bezier
+{
+   public:
+		Bezier (const DPair &p0, const DPair &p1, const DPair &p2);
+      Bezier (const DPair &p0, const DPair &p1, const DPair &p2, const DPair &p3);
+		Bezier (const Bezier &source, double t0, double t1);
+		void reverse ();
+		DPair pointAt (double t) const;
+		void subdivide (double t, Bezier *bezier1, Bezier *bezier2) const;
+		int approximate (double delta, std::vector<DPair> &p, std::vector<double> *t=0) const;
+		const DPair& point (int i) const {return _points[i];}
+		int reduceDegree (double delta, std::vector<DPair> &p) const;
+
+	protected:
+		Bezier ();
+		int approximate (double delta, double t0, double t1, std::vector<DPair> &p, std::vector<double> *t) const;
+
+   private:
+		DPair _points[4];
+};
+
+#endif
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/BgColorSpecialHandler.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/BgColorSpecialHandler.cpp
index dd19e4b5f53..dd19e4b5f53 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/BgColorSpecialHandler.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/BgColorSpecialHandler.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/BgColorSpecialHandler.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/BgColorSpecialHandler.h
index edd764e86b2..edd764e86b2 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/BgColorSpecialHandler.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/BgColorSpecialHandler.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Bitmap.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Bitmap.cpp
index 265533b1ef5..265533b1ef5 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Bitmap.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Bitmap.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Bitmap.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Bitmap.h
index 0883688bd9a..0883688bd9a 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Bitmap.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Bitmap.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/BoundingBox.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/BoundingBox.cpp
index f6c5d0b3b9b..f6c5d0b3b9b 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/BoundingBox.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/BoundingBox.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/BoundingBox.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/BoundingBox.h
index 6d38edf6e3b..6d38edf6e3b 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/BoundingBox.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/BoundingBox.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CMap.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CMap.cpp
index 6b940300f8e..6b940300f8e 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CMap.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CMap.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CMap.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CMap.h
index 324c51800fa..324c51800fa 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CMap.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CMap.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CMapManager.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CMapManager.cpp
index eb73d72f3c4..eb73d72f3c4 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CMapManager.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CMapManager.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CMapManager.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CMapManager.h
index 6918ed93e98..6918ed93e98 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CMapManager.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CMapManager.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CMapReader.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CMapReader.cpp
index 502e42ef2e0..502e42ef2e0 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CMapReader.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CMapReader.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CMapReader.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CMapReader.h
index d9567e79433..d9567e79433 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CMapReader.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CMapReader.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CRC32.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CRC32.cpp
index 3f85710c6b7..3f85710c6b7 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CRC32.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CRC32.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CRC32.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CRC32.h
index 35cd4d4399a..35cd4d4399a 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CRC32.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CRC32.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Calculator.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Calculator.cpp
index 12a35a35edd..12a35a35edd 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Calculator.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Calculator.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Calculator.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Calculator.h
index fdd4ed177d5..fdd4ed177d5 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Calculator.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Calculator.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CharMapID.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CharMapID.cpp
index 4c15abde98f..4c15abde98f 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CharMapID.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CharMapID.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CharMapID.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CharMapID.h
index acc1a8482de..acc1a8482de 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CharMapID.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CharMapID.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Character.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Character.h
index a9d0f6a2d6d..a9d0f6a2d6d 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Character.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Character.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CmdLineParserBase.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CmdLineParserBase.cpp
index 2c8d133cc97..2c8d133cc97 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CmdLineParserBase.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CmdLineParserBase.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CmdLineParserBase.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CmdLineParserBase.h
index 855186f9d4b..855186f9d4b 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CmdLineParserBase.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CmdLineParserBase.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Color.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Color.cpp
index 94514c292a7..94514c292a7 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Color.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Color.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Color.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Color.h
index 99d847560e0..99d847560e0 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Color.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Color.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/ColorSpecialHandler.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/ColorSpecialHandler.cpp
index 937c0f42877..937c0f42877 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/ColorSpecialHandler.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/ColorSpecialHandler.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/ColorSpecialHandler.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/ColorSpecialHandler.h
index 6e7b0edf0f3..6e7b0edf0f3 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/ColorSpecialHandler.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/ColorSpecialHandler.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CommandLine.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CommandLine.cpp
index 3147ea61c49..9395e9b770b 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CommandLine.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CommandLine.cpp
@@ -16,6 +16,7 @@ using namespace std;
 const CmdLineParserBase::Option CommandLine::_options[] = {
 	{'b', "bbox", ARG_REQUIRED, new OptionHandlerImpl<CommandLine>(&CommandLine::handle_bbox)},
 	{'C', "cache", ARG_OPTIONAL, new OptionHandlerImpl<CommandLine>(&CommandLine::handle_cache)},
+	{'j', "clipjoin", ARG_NONE, new OptionHandlerImpl<CommandLine>(&CommandLine::handle_clipjoin)},
 	{'\0', "color", ARG_NONE, new OptionHandlerImpl<CommandLine>(&CommandLine::handle_color)},
 #if !defined(DISABLE_GS)
 	{'E', "eps", ARG_NONE, new OptionHandlerImpl<CommandLine>(&CommandLine::handle_eps)},
@@ -38,6 +39,7 @@ const CmdLineParserBase::Option CommandLine::_options[] = {
 	{'p', "page", ARG_REQUIRED, new OptionHandlerImpl<CommandLine>(&CommandLine::handle_page)},
 	{'d', "precision", ARG_REQUIRED, new OptionHandlerImpl<CommandLine>(&CommandLine::handle_precision)},
 	{'P', "progress", ARG_OPTIONAL, new OptionHandlerImpl<CommandLine>(&CommandLine::handle_progress)},
+	{'R', "relative", ARG_NONE, new OptionHandlerImpl<CommandLine>(&CommandLine::handle_relative)},
 	{'r', "rotate", ARG_REQUIRED, new OptionHandlerImpl<CommandLine>(&CommandLine::handle_rotate)},
 	{'c', "scale", ARG_REQUIRED, new OptionHandlerImpl<CommandLine>(&CommandLine::handle_scale)},
 	{'s', "stdout", ARG_NONE, new OptionHandlerImpl<CommandLine>(&CommandLine::handle_stdout)},
@@ -61,6 +63,7 @@ void CommandLine::init () {
 	// disable all options by default
 	_bbox_given = false;
 	_cache_given = false;
+	_clipjoin_given = false;
 	_color_given = false;
 #if !defined(DISABLE_GS)
 	_eps_given = false;
@@ -83,6 +86,7 @@ void CommandLine::init () {
 	_page_given = false;
 	_precision_given = false;
 	_progress_given = false;
+	_relative_given = false;
 	_rotate_given = false;
 	_scale_given = false;
 	_stdout_given = false;
@@ -132,9 +136,11 @@ const char** CommandLine::helplines (size_t *numlines) const {
 #endif
 		"sSVG output options:",
 		"o-b, --bbox=size               set size of bounding box [min]",
+		"o-j, --clipjoin                compute intersection of clipping paths",
 		"o-L, --linkmark=style          select how to mark hyperlinked areas [box]",
 		"o-o, --output=pattern          set name pattern of output files",
 		"o-d, --precision=number        set number of decimal points (0-6) [0]",
+		"o-R, --relative                create relative path commands",
 		"o-s, --stdout                  write SVG output to stdout",
 		"o-n, --no-fonts[=variant]      draw glyphs by using path elements [0]",
 		"o    --no-styles               don't use styles to reference fonts",
@@ -178,6 +184,10 @@ void CommandLine::handle_cache (InputReader &ir, const Option &opt, bool longopt
 		_cache_given = true;
 }
 
+void CommandLine::handle_clipjoin (InputReader &ir, const Option &opt, bool longopt) {
+	_clipjoin_given = true;
+}
+
 void CommandLine::handle_color (InputReader &ir, const Option &opt, bool longopt) {
 	_color_given = true;
 }
@@ -265,6 +275,10 @@ void CommandLine::handle_progress (InputReader &ir, const Option &opt, bool long
 		_progress_given = true;
 }
 
+void CommandLine::handle_relative (InputReader &ir, const Option &opt, bool longopt) {
+	_relative_given = true;
+}
+
 void CommandLine::handle_rotate (InputReader &ir, const Option &opt, bool longopt) {
 	if (getDoubleArg(ir, opt, longopt, _rotate_arg))
 		_rotate_given = true;
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CommandLine.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CommandLine.h
index 3ec040a6d88..9c86e2feb9c 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/CommandLine.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/CommandLine.h
@@ -19,6 +19,7 @@ class CommandLine : public CmdLineParserBase
 		const std::string& bbox_arg () const {return _bbox_arg;}
 		bool cache_given () const {return _cache_given;}
 		const std::string& cache_arg () const {return _cache_arg;}
+		bool clipjoin_given () const {return _clipjoin_given;}
 		bool color_given () const {return _color_given;}
 #if !defined(DISABLE_GS)
 		bool eps_given () const {return _eps_given;}
@@ -52,6 +53,7 @@ class CommandLine : public CmdLineParserBase
 		int precision_arg () const {return _precision_arg;}
 		bool progress_given () const {return _progress_given;}
 		double progress_arg () const {return _progress_arg;}
+		bool relative_given () const {return _relative_given;}
 		bool rotate_given () const {return _rotate_given;}
 		double rotate_arg () const {return _rotate_arg;}
 		bool scale_given () const {return _scale_given;}
@@ -77,6 +79,7 @@ class CommandLine : public CmdLineParserBase
 		const char** helplines (size_t *numlines) const;
 		void handle_bbox (InputReader &ir, const Option &opt, bool longopt);
 		void handle_cache (InputReader &ir, const Option &opt, bool longopt);
+		void handle_clipjoin (InputReader &ir, const Option &opt, bool longopt);
 		void handle_color (InputReader &ir, const Option &opt, bool longopt);
 #if !defined(DISABLE_GS)
 		void handle_eps (InputReader &ir, const Option &opt, bool longopt);
@@ -99,6 +102,7 @@ class CommandLine : public CmdLineParserBase
 		void handle_page (InputReader &ir, const Option &opt, bool longopt);
 		void handle_precision (InputReader &ir, const Option &opt, bool longopt);
 		void handle_progress (InputReader &ir, const Option &opt, bool longopt);
+		void handle_relative (InputReader &ir, const Option &opt, bool longopt);
 		void handle_rotate (InputReader &ir, const Option &opt, bool longopt);
 		void handle_scale (InputReader &ir, const Option &opt, bool longopt);
 		void handle_stdout (InputReader &ir, const Option &opt, bool longopt);
@@ -116,6 +120,7 @@ class CommandLine : public CmdLineParserBase
 		std::string _bbox_arg;
 		bool _cache_given;
 		std::string _cache_arg;
+		bool _clipjoin_given;
 		bool _color_given;
 #if !defined(DISABLE_GS)
 		bool _eps_given;
@@ -149,6 +154,7 @@ class CommandLine : public CmdLineParserBase
 		int _precision_arg;
 		bool _progress_given;
 		double _progress_arg;
+		bool _relative_given;
 		bool _rotate_given;
 		double _rotate_arg;
 		bool _scale_given;
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DLLoader.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DLLoader.cpp
index 8f03d1a0b83..8f03d1a0b83 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DLLoader.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DLLoader.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DLLoader.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DLLoader.h
index de14be50495..de14be50495 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DLLoader.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DLLoader.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DVIActions.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DVIActions.h
index 7a82d4456f1..7a82d4456f1 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DVIActions.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DVIActions.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DVIReader.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DVIReader.cpp
index 925efe0407b..925efe0407b 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DVIReader.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DVIReader.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DVIReader.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DVIReader.h
index 366a110f531..366a110f531 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DVIReader.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DVIReader.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DVIToSVG.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DVIToSVG.cpp
index d4252961b11..d4252961b11 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DVIToSVG.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DVIToSVG.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DVIToSVG.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DVIToSVG.h
index 297aa5a1620..39f335a2907 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DVIToSVG.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DVIToSVG.h
@@ -37,11 +37,11 @@ class DVIToSVG : public DVIReader
 		DVIToSVG (std::istream &is, SVGOutputBase &out);
 		~DVIToSVG ();
 		void convert (const std::string &range, std::pair<int,int> *pageinfo=0);
-		void setProcessSpecials (const char *ignorelist=0, bool pswarning=false);
 		void setPageSize (const std::string &name)           {_bboxString = name;}
 		void setPageTransformation (const std::string &cmds) {_transCmds = cmds;}
 		void getPageTransformation (Matrix &matrix) const;
 		std::string getSVGFilename (unsigned pageno) const;
+		static void setProcessSpecials (const char *ignorelist=0, bool pswarning=false);
 
 	public:
 		static char TRACE_MODE;
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DVIToSVGActions.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DVIToSVGActions.cpp
index ca716bf88f5..ca716bf88f5 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DVIToSVGActions.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DVIToSVGActions.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DVIToSVGActions.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DVIToSVGActions.h
index 72b61f7f0e2..2980fa2c657 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DVIToSVGActions.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DVIToSVGActions.h
@@ -66,7 +66,7 @@ class DVIToSVGActions : public DVIActions, public SpecialActions
 		void moveToX (double x);
 		void moveToY (double y);
 		void setFont (int num, const Font *font);
-		void special (const std::string &s, double dvi2bp, bool preprocessing=false);
+		void special (const std::string &spc, double dvi2bp, bool preprocessing=false);
 		void preamble (const std::string &cmt);
 		void postamble ();
 		void beginPage (unsigned pageno, Int32 *c);
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Directory.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Directory.cpp
index 925b3065c8d..925b3065c8d 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Directory.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Directory.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Directory.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Directory.h
index a10a26bd39c..a10a26bd39c 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Directory.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Directory.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DvisvgmSpecialHandler.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DvisvgmSpecialHandler.cpp
index a3b2233e5b2..a3b2233e5b2 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DvisvgmSpecialHandler.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DvisvgmSpecialHandler.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DvisvgmSpecialHandler.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DvisvgmSpecialHandler.h
index 13c52718011..13c52718011 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/DvisvgmSpecialHandler.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/DvisvgmSpecialHandler.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/EPSFile.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/EPSFile.cpp
index aea2c9114c9..aea2c9114c9 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/EPSFile.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/EPSFile.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/EPSFile.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/EPSFile.h
index 19b60a42797..19b60a42797 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/EPSFile.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/EPSFile.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/EPSToSVG.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/EPSToSVG.cpp
index 6e0188d1d6f..6e0188d1d6f 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/EPSToSVG.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/EPSToSVG.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/EPSToSVG.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/EPSToSVG.h
index e6d654f595f..e6d654f595f 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/EPSToSVG.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/EPSToSVG.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/EmSpecialHandler.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/EmSpecialHandler.cpp
index 2d944e9433d..2d944e9433d 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/EmSpecialHandler.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/EmSpecialHandler.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/EmSpecialHandler.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/EmSpecialHandler.h
index 000277f6909..000277f6909 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/EmSpecialHandler.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/EmSpecialHandler.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/EncFile.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/EncFile.cpp
index 103090bc3e3..103090bc3e3 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/EncFile.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/EncFile.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/EncFile.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/EncFile.h
index 5d15a48cfff..5d15a48cfff 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/EncFile.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/EncFile.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FileFinder.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FileFinder.cpp
index e8269991053..e8269991053 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FileFinder.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FileFinder.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FileFinder.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FileFinder.h
index e4a59c2346a..e4a59c2346a 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FileFinder.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FileFinder.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FilePath.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FilePath.cpp
index 92922d99354..92922d99354 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FilePath.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FilePath.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FilePath.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FilePath.h
index c1c1bab7064..c1c1bab7064 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FilePath.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FilePath.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FileSystem.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FileSystem.cpp
index 398878853cd..398878853cd 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FileSystem.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FileSystem.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FileSystem.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FileSystem.h
index f60fcd0ac86..f60fcd0ac86 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FileSystem.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FileSystem.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Font.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Font.cpp
index 00d6b7fda9b..1fc51600929 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Font.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Font.cpp
@@ -392,7 +392,7 @@ int PhysicalFont::traceAllGlyphs (bool includeCached, GFGlyphTracer::Callback *c
 				tracer.setGlyph(glyph);
 				for (int i=fchar; i <= lchar; i++) {
 					if (includeCached || !_cache.getGlyph(i)) {
-						glyph.newpath();
+						glyph.clear();
 						tracer.executeChar(i);
 						glyph.closeOpenSubPaths();
 						_cache.setGlyph(i, glyph);
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Font.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Font.h
index beba335793a..beba335793a 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Font.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Font.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontCache.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontCache.cpp
index e617bc9fd34..e617bc9fd34 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontCache.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontCache.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontCache.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontCache.h
index 3afed5485a2..3afed5485a2 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontCache.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontCache.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontEncoding.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontEncoding.cpp
index a0fca850a98..a0fca850a98 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontEncoding.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontEncoding.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontEncoding.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontEncoding.h
index 4c366182632..4c366182632 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontEncoding.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontEncoding.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontEngine.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontEngine.cpp
index b1c6bee0c2d..621184ad943 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontEngine.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontEngine.cpp
@@ -110,6 +110,8 @@ void FontEngine::setDeviceResolution (int x, int y) {
  * @param[in] fontindex index of font in font collection (multi-font files, like TTC)
  * @return true on success */
 bool FontEngine::setFont (const string &fname, int fontindex, const CharMapID &charMapID) {
+	if (_currentFace && FT_Done_Face(_currentFace))
+		Message::estream(true) << "FontEngine: error removing font\n";
 	if (FT_New_Face(_library, fname.c_str(), fontindex, &_currentFace)) {
 		Message::estream(true) << "FontEngine: error reading file " << fname << '\n';
 		return false;
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontEngine.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontEngine.h
index 79a0916d04d..79a0916d04d 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontEngine.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontEngine.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontManager.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontManager.cpp
index bb4288c57a4..bb4288c57a4 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontManager.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontManager.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontManager.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontManager.h
index c5ed1a35a97..c5ed1a35a97 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontManager.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontManager.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontMap.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontMap.cpp
index e885e0a38fa..e885e0a38fa 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontMap.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontMap.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontMap.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontMap.h
index bee44d8e6e7..bee44d8e6e7 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontMap.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontMap.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontMetrics.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontMetrics.cpp
index 3920e4e6e76..3920e4e6e76 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontMetrics.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontMetrics.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontMetrics.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontMetrics.h
index 50207211d2c..50207211d2c 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontMetrics.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontMetrics.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontStyle.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontStyle.h
index 932c09291cc..932c09291cc 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/FontStyle.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/FontStyle.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/GFGlyphTracer.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/GFGlyphTracer.cpp
index 58de265e740..e1d3f916241 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/GFGlyphTracer.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/GFGlyphTracer.cpp
@@ -88,6 +88,6 @@ void GFGlyphTracer::closePath () {
 
 
 void GFGlyphTracer::endChar (UInt32 c) {
-	_glyph->newpath();
+	_glyph->clear();
 	GFTracer::endChar(c);
 }
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/GFGlyphTracer.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/GFGlyphTracer.h
index 57ed0362cc0..57ed0362cc0 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/GFGlyphTracer.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/GFGlyphTracer.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/GFReader.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/GFReader.cpp
index 9b0a319733b..9b0a319733b 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/GFReader.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/GFReader.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/GFReader.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/GFReader.h
index 1706acea126..1706acea126 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/GFReader.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/GFReader.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/GFTracer.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/GFTracer.cpp
index 89ff4359fda..89ff4359fda 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/GFTracer.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/GFTracer.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/GFTracer.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/GFTracer.h
index 617580636f0..617580636f0 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/GFTracer.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/GFTracer.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Ghostscript.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Ghostscript.cpp
index de3ec1b7568..e204842bab9 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Ghostscript.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Ghostscript.cpp
@@ -47,7 +47,7 @@ static string get_libgs (const string &fname) {
 #ifdef MIKTEX
 #if defined(__WIN64__)
 	const char *gsdll = "mgsdll64.dll";
-#elif defined(__WIN32__)
+#else
 	const char *gsdll = "mgsdll32.dll";
 #endif
 	// try to look up the Ghostscript DLL coming with MiKTeX
@@ -76,7 +76,7 @@ static string get_libgs (const string &fname) {
 	// no appropriate library found
 	return "";
 }
-#endif // HAVE_LIBGS
+#endif // !HAVE_LIBGS
 
 
 /** Loads the Ghostscript library but does not create an instance. This
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Ghostscript.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Ghostscript.h
index 6200fa8d0a1..6200fa8d0a1 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Ghostscript.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Ghostscript.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Glyph.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Glyph.h
index 5a003a2196b..5a003a2196b 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Glyph.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Glyph.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/GlyphTracerMessages.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/GlyphTracerMessages.h
index 6256bb843a0..6256bb843a0 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/GlyphTracerMessages.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/GlyphTracerMessages.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/GraphicPath.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/GraphicPath.h
index 9e0d935acc6..dc3cb46852d 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/GraphicPath.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/GraphicPath.h
@@ -21,6 +21,7 @@
 #ifndef DVISVGM_GRAPHICPATH_H
 #define DVISVGM_GRAPHICPATH_H
 
+#include <cctype>
 #include <list>
 #include <ostream>
 #include <vector>
@@ -33,7 +34,9 @@
 template <typename T>
 class GraphicPath
 {
+	friend class PathClipper;
 	public:
+		enum WindingRule {WR_EVEN_ODD, WR_NON_ZERO};
 		typedef Pair<T> Point;
 
 		struct Command {
@@ -90,6 +93,7 @@ class GraphicPath
 			virtual void closepath () {}
 			virtual void draw (char cmd, const Point *points, int n) {}
 			virtual bool quit () {return false;}
+			virtual void finished () {}
 		};
 
 		typedef typename std::vector<Command>::iterator Iterator;
@@ -97,21 +101,30 @@ class GraphicPath
 		typedef typename std::vector<Command>::const_reverse_iterator ConstRevIterator;
 
 	public:
-		void newpath () {
+		GraphicPath (WindingRule wr=WR_NON_ZERO) : _windingRule(wr) {}
+
+		void setWindingRule (WindingRule wr) {_windingRule = wr;}
+		WindingRule windingRule () const     {return _windingRule;}
+
+		void clear () {
 			_commands.clear();
 		}
 
-		/// Returns true if path is empty (there is nothing to draw)
+		/// Returns true if the path is empty, i.e. there is nothing to draw
 		bool empty () const {
 			return _commands.empty();
 		}
 
-
 		/// Returns the number of path commands used to describe the path.
 		size_t size () const {
 			return _commands.size();
 		}
 
+		/// Insert another path at the beginning of this one.
+		void prepend (const GraphicPath &path) {
+			_commands.insert(_commands.begin(), path._commands.begin(), path._commands.end());
+		}
+
 		void moveto (const T &x, const T &y) {
 			moveto(Point(x, y));
 		}
@@ -184,27 +197,41 @@ class GraphicPath
 		 *  @param[in] sy vertical scale factor
 		 *  @param[in] dx horizontal translation in PS point units
 		 *  @param[in] dy vertical translation in PS point units */
-		void writeSVG (std::ostream &os, double sx=1.0, double sy=1.0, double dx=0.0, double dy=0.0) const {
+		void writeSVG (std::ostream &os, bool relative, double sx=1.0, double sy=1.0, double dx=0.0, double dy=0.0) const {
 			struct WriteActions : Actions {
-				WriteActions (std::ostream &os, double sx, double sy, double dx, double dy)
-					: _os(os), _sx(sx), _sy(sy), _dx(dx), _dy(dy) {}
+				WriteActions (std::ostream &os, bool relative, double sx, double sy, double dx, double dy)
+					: _os(os), _relative(relative), _sx(sx), _sy(sy), _dx(dx), _dy(dy) {}
 
 				void draw (char cmd, const Point *points, int n) {
+					if (_relative)
+						cmd = tolower(cmd);
 					_os << cmd;
 					switch (cmd) {
+						case 'h': _os << XMLString(_sx*(points->x()-_currentPoint.x())+_dx); break;
+						case 'v': _os << XMLString(_sy*(points->y()-_currentPoint.y())+_dy); break;
+						case 'z': _currentPoint = _startPoint; break;
 						case 'H': _os << XMLString(_sx*points->x()+_dx); break;
 						case 'V': _os << XMLString(_sy*points->y()+_dy); break;
 						default :
 							for (int i=0; i < n; i++) {
 								if (i > 0)
 									_os << ' ';
-								_os << XMLString(_sx*points[i].x()+_dx) << ' ' << XMLString(_sy*points[i].y()+_dy);
+								Point p = points[i];
+								if (_relative)
+									p -= _currentPoint;
+								_os << XMLString(_sx*p.x()+_dx) << ' ' << XMLString(_sy*p.y()+_dy);
 							}
 					}
+					if (cmd == 'm')
+						_startPoint = points[0];
+					if (islower(cmd) && n > 0)
+						_currentPoint = points[n-1];
 				}
 				std::ostream &_os;
+				bool _relative;
 				double _sx, _sy, _dx, _dy;
-			} actions(os, sx, sy, dx, dy);
+				Point _startPoint, _currentPoint;
+			} actions(os, relative, sx, sy, dx, dy);
 			iterate(actions, true);
 		}
 
@@ -255,6 +282,7 @@ class GraphicPath
 
 	private:
 		std::vector<Command> _commands;
+		WindingRule _windingRule;
 };
 
 
@@ -335,6 +363,7 @@ void GraphicPath<T>::iterate (Actions &actions, bool optimize) const {
 			cp = it->params[np-1];
 		prev = it;
 	}
+	actions.finished();
 }
 
 #endif
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/HtmlSpecialHandler.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/HtmlSpecialHandler.cpp
index dc419e8ebb8..dc419e8ebb8 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/HtmlSpecialHandler.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/HtmlSpecialHandler.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/HtmlSpecialHandler.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/HtmlSpecialHandler.h
index f1c3466bdaa..221c325185f 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/HtmlSpecialHandler.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/HtmlSpecialHandler.h
@@ -50,7 +50,7 @@ class HtmlSpecialHandler : public SpecialHandler, public DVIEndPageListener, pub
 		const char* info () const  {return "hyperref specials";}
 		const char** prefixes () const;
 
-		static bool setLinkMarker (const std::string &type);
+		static bool setLinkMarker (const std::string &marker);
 
 	protected:
 		void preprocessHrefAnchor (const std::string &uri);
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/InputBuffer.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/InputBuffer.cpp
index 154c60511bd..154c60511bd 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/InputBuffer.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/InputBuffer.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/InputBuffer.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/InputBuffer.h
index efcbc36ed74..efcbc36ed74 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/InputBuffer.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/InputBuffer.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/InputReader.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/InputReader.cpp
index f90bae04f8c..8a8709fe0f7 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/InputReader.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/InputReader.cpp
@@ -87,8 +87,11 @@ int InputReader::compare (const char *s, bool consume) {
 	for (const char *p=s; *p; p++) {
 		int c = peek(count++);
 		if (c != *p)
-			return *p < c ? -1 : 1;
+			return c < *p ? -1 : 1;
 	}
+	int c = peek(count);
+	if (c < 0 || !isspace(c))
+		return 1;
 	if (consume)
 		skip(count);
 	return 0;
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/InputReader.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/InputReader.h
index d2eb5703211..d2eb5703211 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/InputReader.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/InputReader.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/JFM.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/JFM.cpp
index 89c4796616c..89c4796616c 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/JFM.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/JFM.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/JFM.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/JFM.h
index 297ad6df710..297ad6df710 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/JFM.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/JFM.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Length.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Length.cpp
index 09951489ff6..09951489ff6 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Length.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Length.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Length.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Length.h
index 109cc2d2898..109cc2d2898 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Length.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Length.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Makefile.am b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Makefile.am
index 97f6a88d0bb..331ed44696e 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Makefile.am
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Makefile.am
@@ -9,12 +9,14 @@ noinst_LIBRARIES     = libdvisvgm.a
 dvisvgm_SOURCES      = gzstream.h \
 							  dvisvgm.cpp gzstream.cpp
 
-dvisvgm_LDADD        = $(noinst_LIBRARIES) @EXTRA_LIBS@
+dvisvgm_LDADD        = $(noinst_LIBRARIES) @EXTRA_LIBS@ ../clipper/libclipper.a
 dvisvgm_DEPENDENCIES = $(noinst_LIBRARIES) @EXTRA_LIBS@
 
 libdvisvgm_a_SOURCES = \
 	BasicDVIReader.cpp \
 	BasicDVIReader.h \
+	Bezier.cpp \
+	Bezier.h \
 	BgColorSpecialHandler.cpp \
 	BgColorSpecialHandler.h \
 	Bitmap.cpp \
@@ -123,6 +125,8 @@ libdvisvgm_a_SOURCES = \
 	PageSize.cpp \
 	PageSize.h \
 	Pair.h \
+	PathClipper.cpp \
+	PathClipper.h \
 	PdfSpecialHandler.cpp \
 	PdfSpecialHandler.h \
 	PreScanDVIReader.cpp \
@@ -182,7 +186,7 @@ libdvisvgm_a_SOURCES = \
 
 EXTRA_DIST = options.xml options.dtd iapi.h ierrors.h MiKTeXCom.h MiKTeXCom.cpp
 
-AM_CXXFLAGS = -Wall -Wnon-virtual-dtor
+AM_CXXFLAGS = -Wall -Wnon-virtual-dtor -I$(top_srcdir)/clipper
 
 # the command-line parser is generated from options.xml by opt2cpp
 CommandLine.cpp: options.xml
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/MapLine.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/MapLine.cpp
index d571d094890..d571d094890 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/MapLine.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/MapLine.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/MapLine.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/MapLine.h
index 2c1a53518fa..2c1a53518fa 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/MapLine.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/MapLine.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Matrix.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Matrix.cpp
index e0e301d281d..e0e301d281d 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Matrix.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Matrix.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Matrix.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Matrix.h
index bcff8a57bad..bcff8a57bad 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Matrix.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Matrix.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Message.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Message.cpp
index c875109633f..c875109633f 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Message.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Message.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Message.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Message.h
index 7c39127dbd4..7c39127dbd4 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Message.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Message.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/MessageException.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/MessageException.h
index 446c2e1282f..446c2e1282f 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/MessageException.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/MessageException.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/MetafontWrapper.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/MetafontWrapper.cpp
index 6e955faeec5..6e955faeec5 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/MetafontWrapper.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/MetafontWrapper.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/MetafontWrapper.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/MetafontWrapper.h
index 8a59dc9d5d7..8a59dc9d5d7 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/MetafontWrapper.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/MetafontWrapper.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/MiKTeXCom.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/MiKTeXCom.cpp
index bb4353f8ee4..bb4353f8ee4 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/MiKTeXCom.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/MiKTeXCom.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/MiKTeXCom.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/MiKTeXCom.h
index dcb6271a4bc..dcb6271a4bc 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/MiKTeXCom.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/MiKTeXCom.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/NoPsSpecialHandler.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/NoPsSpecialHandler.cpp
index 0a5119f6938..0a5119f6938 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/NoPsSpecialHandler.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/NoPsSpecialHandler.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/NoPsSpecialHandler.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/NoPsSpecialHandler.h
index 8af05f889a3..8af05f889a3 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/NoPsSpecialHandler.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/NoPsSpecialHandler.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/NumericRanges.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/NumericRanges.h
index 7d810fb2a5d..7d810fb2a5d 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/NumericRanges.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/NumericRanges.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PSFilter.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PSFilter.h
index e2c5c092dd3..e2c5c092dd3 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PSFilter.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PSFilter.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PSInterpreter.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PSInterpreter.cpp
index 9ca5ed39c27..b1fa641fe46 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PSInterpreter.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PSInterpreter.cpp
@@ -263,6 +263,7 @@ void PSInterpreter::callActions (InputReader &in) {
 	} operators [] = {
 		{"applyscalevals",  3, &PSActions::applyscalevals},
 		{"clip",            0, &PSActions::clip},
+		{"clippath",        0, &PSActions::clippath},
 		{"closepath",       0, &PSActions::closepath},
 		{"curveto",         6, &PSActions::curveto},
 		{"eoclip",          0, &PSActions::eoclip},
@@ -275,7 +276,7 @@ void PSInterpreter::callActions (InputReader &in) {
 		{"lineto",          2, &PSActions::lineto},
 		{"makepattern",    -1, &PSActions::makepattern},
 		{"moveto",          2, &PSActions::moveto},
-		{"newpath",         0, &PSActions::newpath},
+		{"newpath",         1, &PSActions::newpath},
 		{"querypos",        2, &PSActions::querypos},
 		{"raw",            -1, 0},
 		{"restore",         1, &PSActions::restore},
@@ -304,9 +305,9 @@ void PSInterpreter::callActions (InputReader &in) {
 		while (first <= last) {
 			int mid = first+(last-first)/2;
 			int cmp = in.compare(operators[mid].name);
-			if (cmp > 0)
+			if (cmp < 0)
 				last = mid-1;
-			else if (cmp < 0)
+			else if (cmp > 0)
 				first = mid+1;
 			else {
 				if (!operators[mid].op) {  // raw string data received
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PSInterpreter.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PSInterpreter.h
index 2e98bf27e96..6d1794e5065 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PSInterpreter.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PSInterpreter.h
@@ -43,6 +43,7 @@ struct PSActions
 	virtual ~PSActions () {}
 	virtual void applyscalevals (std::vector<double> &p) =0;
 	virtual void clip (std::vector<double> &p) =0;
+	virtual void clippath (std::vector<double> &p) =0;
 	virtual void closepath (std::vector<double> &p) =0;
 	virtual void curveto (std::vector<double> &p) =0;
 	virtual void eoclip (std::vector<double> &p) =0;
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PSPattern.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PSPattern.cpp
index 107dac4f795..107dac4f795 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PSPattern.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PSPattern.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PSPattern.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PSPattern.h
index 96911b921da..96911b921da 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PSPattern.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PSPattern.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PSPreviewFilter.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PSPreviewFilter.cpp
index c9b3b080118..c9b3b080118 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PSPreviewFilter.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PSPreviewFilter.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PSPreviewFilter.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PSPreviewFilter.h
index 3e65ac9ba4c..3e65ac9ba4c 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PSPreviewFilter.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PSPreviewFilter.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PageRanges.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PageRanges.cpp
index e19e679c67e..e19e679c67e 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PageRanges.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PageRanges.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PageRanges.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PageRanges.h
index 3292986226d..3292986226d 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PageRanges.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PageRanges.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PageSize.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PageSize.cpp
index 2cc3f36512d..2cc3f36512d 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PageSize.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PageSize.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PageSize.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PageSize.h
index d63079ae784..d63079ae784 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PageSize.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PageSize.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Pair.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Pair.h
index 6183b3b97e3..6183b3b97e3 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Pair.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Pair.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PathClipper.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PathClipper.cpp
new file mode 100644
index 00000000000..fcc231fb5fe
--- /dev/null
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PathClipper.cpp
@@ -0,0 +1,343 @@
+/*************************************************************************
+** PathClipper.cpp                                                      **
+**                                                                      **
+** This file is part of dvisvgm -- the DVI to SVG converter             **
+** Copyright (C) 2005-2014 Martin Gieseking <martin.gieseking@uos.de>   **
+**                                                                      **
+** This program is free software; you can redistribute it and/or        **
+** modify it under the terms of the GNU General Public License as       **
+** published by the Free Software Foundation; either version 3 of       **
+** the License, or (at your option) any later version.                  **
+**                                                                      **
+** This program is distributed in the hope that it will be useful, but  **
+** WITHOUT ANY WARRANTY; without even the implied warranty of           **
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the         **
+** GNU General Public License for more details.                         **
+**                                                                      **
+** You should have received a copy of the GNU General Public License    **
+** along with this program; if not, see <http://www.gnu.org/licenses/>. **
+*************************************************************************/
+
+#include <config.h>
+#include "Bezier.h"
+#include "PathClipper.h"
+#include "types.h"
+
+using namespace std;
+using namespace ClipperLib;
+
+typedef ClipperLib::Path Polygon;
+typedef ClipperLib::Paths Polygons;
+typedef PathClipper::CurvedPath CurvedPath;
+
+const int SCALE_FACTOR = 1000;
+
+inline cInt to_cInt (double x) {
+	if (x < 0)
+		return static_cast<cInt>(x*SCALE_FACTOR - 0.5);
+	return static_cast<cInt>(x*SCALE_FACTOR + 0.5);
+}
+
+
+inline double to_double (cInt x) {
+	return static_cast<double>(x)/SCALE_FACTOR;
+}
+
+
+inline DPair to_DPair (const IntPoint &p) {
+	return DPair(to_double(p.X), to_double(p.Y));
+}
+
+
+/** In order to flatten a curved path, all path segements are processed sequentially.
+ *  Depending on the type of the segment, one of the methods provided by this class
+ *  is called. */
+class FlattenActions : public CurvedPath::Actions {
+	public:
+		FlattenActions (vector<Bezier> &curves, Polygons &polygons, int &numLines)
+			: _polygons(polygons), _curves(curves), _numLines(numLines) {}
+
+		void moveto (const CurvedPath::Point &p) {
+			if (p == _currentPoint && !_currentPoly.empty())
+				return;
+			closepath();
+			_currentPoly.push_back(IntPoint(to_cInt(p.x()), to_cInt(p.y()), 0));
+			_currentPoint = _startPoint = p;
+		}
+
+		void lineto (const CurvedPath::Point &p) {
+			if (p == _currentPoint && !_currentPoly.empty())
+				return;
+			if (_currentPoly.empty()) // this shouldn't happen but in case it does...
+				_currentPoly.push_back(IntPoint(0, 0, 0)); // ...add a start point first
+			_numLines--;
+			_currentPoly.back().Z.label2 = _numLines;
+			_currentPoly.push_back(IntPoint(to_cInt(p.x()), to_cInt(p.y()), ZType(_numLines, 0)));
+			_currentPoint = p;
+		}
+
+		void conicto (const CurvedPath::Point &p1, const CurvedPath::Point &p2) {
+			Bezier bezier(_currentPoint, p1, p2);
+			addCurvePoints(bezier);
+		}
+
+		void cubicto (const CurvedPath::Point &p1, const CurvedPath::Point &p2, const CurvedPath::Point &p3) {
+			Bezier bezier(_currentPoint, p1, p2, p3);
+			addCurvePoints(bezier);
+		}
+
+		void closepath () {
+			if (_currentPoly.empty())
+				return;
+			_numLines--;
+			_currentPoly.back().Z.label2 = ZLabel(_numLines, 0);
+			_currentPoly.front().Z.label1 = ZLabel(_numLines, 0);
+			_polygons.push_back(_currentPoly);
+			_currentPoly.clear();
+		}
+
+		void finished () {
+			closepath();
+		}
+
+	protected:
+		void addCurvePoints (const Bezier &bezier) {
+			if (_currentPoly.empty()) // this shouldn't happen but in case it does, ...
+				_currentPoly.push_back(IntPoint(0, 0, 0)); // ...add a start point first
+			vector<DPair> points;  // points of flattened curve
+			vector<double> t;      // corresponding 'time' parameters
+			bezier.approximate(0.01, points, &t);
+			if (points.size() < 2)
+				return;
+			_curves.push_back(bezier);
+			for (size_t i=1; i < points.size(); i++) {
+				const DPair &p = points[i];
+				if (p == _currentPoint)
+					continue;
+				_currentPoly.back().Z.label2 = ZLabel(_curves.size(), t[i-1]);
+				ZLabel label(_curves.size(), t[i]);
+				_currentPoly.push_back(IntPoint(to_cInt(p.x()), to_cInt(p.y()), ZType(label, label)));
+				_currentPoint = p;
+			}
+		}
+
+	private:
+		CurvedPath::Point _startPoint, _currentPoint;
+		Polygon _currentPoly;    ///< polygon being created
+		Polygons &_polygons;     ///< all polygons created
+		vector<Bezier> &_curves;
+		int &_numLines;
+};
+
+
+/** Removes adjacent polygon vertices that equal their predecessor. */
+static void remove_redundant_vertices (Polygon &polygon) {
+	Polygon::iterator it1=polygon.begin();
+	while (it1 != polygon.end()) {
+		Polygon::iterator it2 = it1+1;
+		if (it2 == polygon.end())
+			it2 = polygon.begin();
+		if (it1 == it2)
+			return;
+
+		if (*it1 != *it2)
+			++it1;
+		else {
+			it1->Z.label2 = it2->Z.label2;
+			polygon.erase(it2);
+		}
+	}
+}
+
+
+/** Approximates a curved path by a set of polygons and stores information
+ *  to reconstruct the curved segments later. The z component of each
+ *  polygon vertex holds two integers representing information about the two
+ *  adjacent edges the vertex belongs to. This is required to identify the
+ *  affected edges and thus the former (curve/line) segment of the path during
+ *  the intersection process.
+ *  @param[in] curvedPath curved path to be flattened
+ *  @param[out] polygons the flattened path (set of polygons) */
+void PathClipper::flatten (const CurvedPath &curvedPath, Polygons &polygons) {
+	FlattenActions flattenActions(_curves, polygons, _numLines);
+	curvedPath.iterate(flattenActions, false);
+	for (size_t i=0; i < polygons.size(); i++)
+		remove_redundant_vertices(polygons[i]);
+}
+
+
+/** Returns the ID of the path segment the polygon edge defined by its start
+ *  and end point belongs to. The z component of a polygon vertex holds a pair
+ *  of labels that allows to identify the original path segments the point belongs to.
+ *  Since always two adjacent segments share a point, each point gets two values assigned.
+ *  Negative numbers denote line segments, positive ones Bézier curves.
+ *  There are only these two segment types, so we don't need further flags in
+ *  order to distinguish them. By comparing the labels of two adjacent polygon
+ *  vertexes it's possible to identify the original path segment the corresponding
+ *  edge belongs to.
+ *  @param[in] p1 first of two adjacent vertices
+ *  @param[in] p2 second of two adjacent vertices
+ *  @param[out] t1 time paramater of p1
+ *  @param[out] t2 time paramater of p2
+ *  @return id of edge between p1 and p2, or 0 if it's not possible to identify the segment */
+static Int32 segment_id (const IntPoint &p1, const IntPoint &p2, double &t1, double &t2) {
+	const ZType &z1=p1.Z, &z2=p2.Z;
+	if (z1 == z2 && z1.minLabel().id < 0) return z1.minLabel().id;
+	if (z1.label1 == z2.label2) {t1=z1.label1.t; t2=z2.label2.t; return z1.label1.id;}
+	if (z1.label2 == z2.label1) {t1=z1.label2.t; t2=z2.label1.t; return z1.label2.id;}
+	if (z1.label1 == z2.label1) {t1=z1.label1.t; t2=z2.label1.t; return z1.label1.id;}
+	if (z1.label2 == z2.label2) {t1=z1.label2.t; t2=z2.label2.t; return z1.label2.id;}
+	// if we get here, it's not possible to identify the segment
+	// => the edge is going to be handled as line segment
+	return 0;
+}
+
+
+inline Int32 edge_id (const IntPoint &p1, const IntPoint &p2) {
+	double t;
+	return segment_id(p1, p2, t, t);
+}
+
+
+/** This function expects 3 colinear points p1, p2, and q where q lies between p1 and p2,
+ *  i.e. q divides the line \f$ \overline{p_1 p_2} \f$ somewhere. The function returns
+ *  the corresponding division ratio. */
+static double division_ratio (const IntPoint &p1, const IntPoint &p2, const IntPoint &q) {
+	if (p1 == p2 || q == p1)
+		return 0;
+	if (q == p2)
+		return 1;
+	if (p1.X == p2.X)
+		return double(q.Y-p1.Y)/(p2.Y-p1.Y);
+	return double(q.X-p1.X)/(p2.X-p1.X);
+}
+
+
+/** Returns the label of point q that lies on the line between points p1 and p2. */
+inline ZLabel division_label (const IntPoint &p1, const IntPoint &p2, const IntPoint &q) {
+	double t1, t2;
+	double s=0;
+	Int32 id = segment_id(p1, p2, t1, t2);
+	if (id > 0)
+		s = t1+(t2-t1)*division_ratio(p1, p2, q);
+	return ZLabel(id, s);
+}
+
+
+/** This method is called if the clipper library finds an intersection between two polygon edges.
+ *  It populates the z coordinate of the intersection point with the idexes of the two edges.
+ *  @param[in] e1bot first endpoint of edge 1
+ *  @param[in] e1top second endpoint of edge 1
+ *  @param[in] e2bot first endpoint of edge 2
+ *  @param[in] e1top second endpoint of edge 2
+ *  @param[in] ip intersection point of edge 1 and 2
+ *  @param[in] userval pointer to PathClipper object set by ZFillFunction() */
+void PathClipper::callback (IntPoint &e1bot, IntPoint &e1top, IntPoint &e2bot, IntPoint &e2top, IntPoint &ip) {
+	ZLabel label1 = division_label(e1bot, e1top, ip);
+	ZLabel label2 = division_label(e2bot, e2top, ip);
+	ip.Z = ZType(label1, label2);
+}
+
+
+/** Iterates along the polygon edges until the endpoint of the current
+ *  path segment is found and returns its vector index afterwards.
+ *  @param[in] points the vertices of the polygon
+ *  @param[in] start index of the vertex where the iteration starts
+ *  @param[out] label if not 0, retrieves the label of the endpoint
+ *  @param[in] startLabel if true, the found endpoint is treated as start point and
+ *             parameter 'label' gets the corresponding value */
+static size_t find_segment_endpoint (const Polygon &polygon, size_t start, ZLabel *label=0, bool startLabel=false) {
+	if (polygon.empty())
+		return 0;
+
+	const size_t num_points = polygon.size();
+	int i = start%num_points;
+	double t1, t2; // time parameters of start and endpoint of current edge
+	Int32 id1 = segment_id(polygon[i], polygon[(i+1)%num_points], t1, t2);
+	Int32 id2 = id1;
+	double t = t2; // time parameter of resulting endpoint
+	for (size_t j=1; id1 == id2 && j < num_points; j++) {
+		t = t2;
+		i = (i+1)%num_points;
+		if (id1 == 0)
+			break;
+		id2 = segment_id(polygon[i], polygon[(i+1)%num_points], t1, t2);
+	}
+	if (label) {
+		*label = ZLabel(id1, id1 < 0 ? 0 : t);
+		if (startLabel && id1 != 0)
+			*label = polygon[i].Z.otherLabel(*label);
+	}
+	return i;
+}
+
+
+/** Reconstructs a curved path from the set of polygons.
+ *  @param[in] polygons set of polygons to reconstruct
+ *  @param[out] path the reconstructed curved path */
+void PathClipper::reconstruct (const Polygons &polygons, CurvedPath &path) {
+	for (size_t i=0; i < polygons.size(); i++)
+		reconstruct(polygons[i], path);
+}
+
+
+/** Reconstructs a curved path from a single polygon.
+ *  @param[in] polygon polygon to reconstruct
+ *  @param[out] path the reconstructed curved path */
+void PathClipper::reconstruct (const Polygon &polygon, CurvedPath &path) {
+	size_t num_points = polygon.size();
+	if (num_points < 2)
+		return;
+
+	ZLabel label1, label2;  // labels of the current segment's start and endpoint
+	int index1 = find_segment_endpoint(polygon, 0, &label1, true);
+	int index2 = find_segment_endpoint(polygon, index1, &label2);
+	int diff = (num_points+index2-index1)%num_points;
+	path.moveto(to_DPair(polygon[index1]));
+	for (size_t count = diff; count <= num_points; count += diff) {
+		if (diff == 1 || label1.id <= 0)  // line segment?
+			path.lineto(to_DPair(polygon[index2]));
+		else {  // Bézier curve segment
+			Bezier bezier(_curves[label1.id-1], label1.t, label2.t);
+			if (label1.t > label2.t)
+				bezier.reverse();
+			path.cubicto(bezier.point(1), bezier.point(2), bezier.point(3));
+		}
+		if (label1.id == 0)
+			find_segment_endpoint(polygon, index2, &label1, true);
+		else
+			label1 = polygon[index2].Z.otherLabel(label2);
+		index1 = index2;
+		index2 = find_segment_endpoint(polygon, index1, &label2);
+		diff = (num_points+index2-index1)%num_points;
+	}
+	path.closepath();
+}
+
+
+inline PolyFillType polyFillType (CurvedPath::WindingRule wr) {
+	return (wr == CurvedPath::WR_NON_ZERO) ? pftNonZero : pftEvenOdd;
+}
+
+
+/** Computes the intersection of to curved path.
+ *  @param[in] p1 first curved path
+ *  @param[in] wr1 winding rule to be applied to p1
+ *  @param[in] p2 second curved path
+ *  @param[in] wr2 winding rule to be applied to p2
+ *  @param[out] result intersection of p1 and p2 */
+void PathClipper::intersect (const CurvedPath &p1, const CurvedPath &p2, CurvedPath &result) {
+	if (p1.size() < 2 || p2.size() < 2)
+		return;
+	Clipper clipper;
+	Polygons polygons;
+	flatten(p1, polygons);
+	clipper.AddPaths(polygons, ptSubject, true);
+	polygons.clear();
+	flatten(p2, polygons);
+	clipper.AddPaths(polygons, ptClip, true);
+	clipper.ZFillFunction(callback);
+	Polygons flattenedPath;
+	clipper.Execute(ctIntersection, flattenedPath, polyFillType(p1.windingRule()), polyFillType(p2.windingRule()));
+	reconstruct(flattenedPath, result);
+}
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PathClipper.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PathClipper.h
new file mode 100644
index 00000000000..c8aca25dbc1
--- /dev/null
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PathClipper.h
@@ -0,0 +1,60 @@
+/*************************************************************************
+** PathClipper.h                                                        **
+**                                                                      **
+** This file is part of dvisvgm -- the DVI to SVG converter             **
+** Copyright (C) 2005-2014 Martin Gieseking <martin.gieseking@uos.de>   **
+**                                                                      **
+** This program is free software; you can redistribute it and/or        **
+** modify it under the terms of the GNU General Public License as       **
+** published by the Free Software Foundation; either version 3 of       **
+** the License, or (at your option) any later version.                  **
+**                                                                      **
+** This program is distributed in the hope that it will be useful, but  **
+** WITHOUT ANY WARRANTY; without even the implied warranty of           **
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the         **
+** GNU General Public License for more details.                         **
+**                                                                      **
+** You should have received a copy of the GNU General Public License    **
+** along with this program; if not, see <http://www.gnu.org/licenses/>. **
+*************************************************************************/
+
+#ifndef DVISVGM_PATHCLIPPER_H
+#define DVISVGM_PATHCLIPPER_H
+
+#include <clipper.hpp>
+#include <string>
+#include <vector>
+#include "Bezier.h"
+#include "GraphicPath.h"
+#include "MessageException.h"
+
+struct PathClipperException : public MessageException
+{
+	PathClipperException (const std::string &msg) : MessageException(msg) {}
+};
+
+
+using ClipperLib::IntPoint;
+
+class PathClipper
+{
+	public:
+		typedef GraphicPath<double> CurvedPath;
+
+	public:
+		PathClipper () : _numLines(0) {}
+		void intersect (const CurvedPath &p1, const CurvedPath &p2, CurvedPath &result);
+
+	protected:
+		void flatten (const CurvedPath &gp, ClipperLib::Paths &polygons);
+//		void divide (IntPoint &p1, IntPoint &p2, IntPoint &ip);
+		void reconstruct (const ClipperLib::Path &polygon, CurvedPath &path);
+		void reconstruct (const ClipperLib::Paths &polygons, CurvedPath &path);
+		static void callback (IntPoint &e1bot, IntPoint &e1top, IntPoint &e2bot, IntPoint &e2top, IntPoint &pt);
+
+	private:
+		std::vector<Bezier> _curves;
+		int _numLines;  ///< negative number of straight line segments in path been processed
+};
+
+#endif
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PdfSpecialHandler.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PdfSpecialHandler.cpp
index fb8e775759f..fb8e775759f 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PdfSpecialHandler.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PdfSpecialHandler.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PdfSpecialHandler.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PdfSpecialHandler.h
index 6865a21d9be..6865a21d9be 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PdfSpecialHandler.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PdfSpecialHandler.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PreScanDVIReader.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PreScanDVIReader.cpp
index f88010b89ed..f88010b89ed 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PreScanDVIReader.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PreScanDVIReader.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PreScanDVIReader.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PreScanDVIReader.h
index 1e033e73fa6..1e033e73fa6 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PreScanDVIReader.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PreScanDVIReader.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Process.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Process.cpp
index 41c3bec0daa..41c3bec0daa 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Process.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Process.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Process.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Process.h
index 54f4ec611c3..54f4ec611c3 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Process.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Process.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PsSpecialHandler.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PsSpecialHandler.cpp
index 7c5753125fe..13b770a1db8 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PsSpecialHandler.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PsSpecialHandler.cpp
@@ -27,15 +27,18 @@
 #include "FileFinder.h"
 #include "Ghostscript.h"
 #include "Message.h"
+#include "PathClipper.h"
 #include "PSPattern.h"
 #include "PSPreviewFilter.h"
 #include "PsSpecialHandler.h"
 #include "SpecialActions.h"
+#include "SVGTree.h"
 #include "XMLNode.h"
 #include "XMLString.h"
 
 using namespace std;
 
+
 static inline double str2double (const string &str) {
 	double ret;
 	istringstream iss(str);
@@ -44,6 +47,9 @@ static inline double str2double (const string &str) {
 }
 
 
+bool PsSpecialHandler::COMPUTE_CLIPPATHS_INTERSECTIONS = false;
+
+
 PsSpecialHandler::PsSpecialHandler () : _psi(this), _actions(0), _previewFilter(_psi), _psSection(PS_NONE), _xmlnode(0)
 {
 }
@@ -442,78 +448,80 @@ void PsSpecialHandler::closepath (vector<double> &p) {
 /** Draws the current path recorded by previously executed path commands (moveto, lineto,...).
  *  @param[in] p not used */
 void PsSpecialHandler::stroke (vector<double> &p) {
-	if (!_path.empty() && _actions) {
-		BoundingBox bbox;
-		if (!_actions->getMatrix().isIdentity()) {
-			_path.transform(_actions->getMatrix());
-			if (!_xmlnode)
-				bbox.transform(_actions->getMatrix());
-		}
+	if ((_path.empty() && !_clipStack.clippathLoaded()) || !_actions)
+		return;
 
-		XMLElementNode *path=0;
-		Pair<double> point;
-		if (_path.isDot(point)) {  // zero-length path?
-			if (_linecap == 1) {    // round line ends?  => draw dot
-				double x = point.x();
-				double y = point.y();
-				double r = _linewidth/2.0;
-				path = new XMLElementNode("circle");
-				path->addAttribute("cx", x);
-				path->addAttribute("cy", y);
-				path->addAttribute("r", r);
-				path->addAttribute("fill", _actions->getColor().rgbString());
-				bbox = BoundingBox(x-r, y-r, x+r, y+r);
-			}
+	BoundingBox bbox;
+	if (!_actions->getMatrix().isIdentity()) {
+		_path.transform(_actions->getMatrix());
+		if (!_xmlnode)
+			bbox.transform(_actions->getMatrix());
+	}
+	if (_clipStack.clippathLoaded() && _clipStack.top())
+		_path.prepend(*_clipStack.top());
+	XMLElementNode *path=0;
+	Pair<double> point;
+	if (_path.isDot(point)) {  // zero-length path?
+		if (_linecap == 1) {    // round line ends?  => draw dot
+			double x = point.x();
+			double y = point.y();
+			double r = _linewidth/2.0;
+			path = new XMLElementNode("circle");
+			path->addAttribute("cx", x);
+			path->addAttribute("cy", y);
+			path->addAttribute("r", r);
+			path->addAttribute("fill", _actions->getColor().rgbString());
+			bbox = BoundingBox(x-r, y-r, x+r, y+r);
 		}
-		else {
-			// compute bounding box
-			_path.computeBBox(bbox);
-			bbox.expand(_linewidth/2);
+	}
+	else {
+		// compute bounding box
+		_path.computeBBox(bbox);
+		bbox.expand(_linewidth/2);
 
+		ostringstream oss;
+		_path.writeSVG(oss, SVGTree::RELATIVE_PATH_CMDS);
+		path = new XMLElementNode("path");
+		path->addAttribute("d", oss.str());
+		path->addAttribute("stroke", _actions->getColor().rgbString());
+		path->addAttribute("fill", "none");
+		if (_linewidth != 1)
+			path->addAttribute("stroke-width", _linewidth);
+		if (_miterlimit != 4)
+			path->addAttribute("stroke-miterlimit", _miterlimit);
+		if (_linecap > 0)     // default value is "butt", no need to set it explicitly
+			path->addAttribute("stroke-linecap", _linecap == 1 ? "round" : "square");
+		if (_linejoin > 0)    // default value is "miter", no need to set it explicitly
+			path->addAttribute("stroke-linejoin", _linecap == 1 ? "round" : "bevel");
+		if (_opacityalpha < 1)
+			path->addAttribute("stroke-opacity", _opacityalpha);
+		if (!_dashpattern.empty()) {
 			ostringstream oss;
-			_path.writeSVG(oss);
-			path = new XMLElementNode("path");
-			path->addAttribute("d", oss.str());
-			path->addAttribute("stroke", _actions->getColor().rgbString());
-			path->addAttribute("fill", "none");
-			if (_linewidth != 1)
-				path->addAttribute("stroke-width", _linewidth);
-			if (_miterlimit != 4)
-				path->addAttribute("stroke-miterlimit", _miterlimit);
-			if (_linecap > 0)     // default value is "butt", no need to set it explicitly
-				path->addAttribute("stroke-linecap", _linecap == 1 ? "round" : "square");
-			if (_linejoin > 0)    // default value is "miter", no need to set it explicitly
-				path->addAttribute("stroke-linejoin", _linecap == 1 ? "round" : "bevel");
-			if (_opacityalpha < 1)
-				path->addAttribute("stroke-opacity", _opacityalpha);
-			if (!_dashpattern.empty()) {
-				ostringstream oss;
-				for (size_t i=0; i < _dashpattern.size(); i++) {
-					if (i > 0)
-						oss << ',';
-					oss << XMLString(_dashpattern[i]);
-				}
-				path->addAttribute("stroke-dasharray", oss.str());
-				if (_dashoffset != 0)
-					path->addAttribute("stroke-dashoffset", _dashoffset);
+			for (size_t i=0; i < _dashpattern.size(); i++) {
+				if (i > 0)
+					oss << ',';
+				oss << XMLString(_dashpattern[i]);
 			}
+			path->addAttribute("stroke-dasharray", oss.str());
+			if (_dashoffset != 0)
+				path->addAttribute("stroke-dashoffset", _dashoffset);
 		}
-		if (path && _clipStack.top()) {
-			// assign clipping path and clip bounding box
-			path->addAttribute("clip-path", XMLString("url(#clip")+XMLString(_clipStack.topID())+")");
-			BoundingBox clipbox;
-			_clipStack.top()->computeBBox(clipbox);
-			bbox.intersect(clipbox);
-		}
-
-		if (_xmlnode)
-			_xmlnode->append(path);
-		else {
-			_actions->appendToPage(path);
-			_actions->embed(bbox);
-		}
-		_path.newpath();
 	}
+	if (path && _clipStack.top()) {
+		// assign clipping path and clip bounding box
+		path->addAttribute("clip-path", XMLString("url(#clip")+XMLString(_clipStack.topID())+")");
+		BoundingBox clipbox;
+		_clipStack.top()->computeBBox(clipbox);
+		bbox.intersect(clipbox);
+		_clipStack.setClippathLoaded(false);
+	}
+	if (_xmlnode)
+		_xmlnode->append(path);
+	else {
+		_actions->appendToPage(path);
+		_actions->embed(bbox);
+	}
+	_path.clear();
 }
 
 
@@ -521,43 +529,47 @@ void PsSpecialHandler::stroke (vector<double> &p) {
  *  @param[in] p not used
  *  @param[in] evenodd true: use even-odd fill algorithm, false: use nonzero fill algorithm */
 void PsSpecialHandler::fill (vector<double> &p, bool evenodd) {
-	if (!_path.empty() && _actions) {
-		// compute bounding box
-		BoundingBox bbox;
-		_path.computeBBox(bbox);
-		if (!_actions->getMatrix().isIdentity()) {
-			_path.transform(_actions->getMatrix());
-			if (!_xmlnode)
-				bbox.transform(_actions->getMatrix());
-		}
+	if ((_path.empty() && !_clipStack.clippathLoaded()) || !_actions)
+		return;
 
-		ostringstream oss;
-		_path.writeSVG(oss);
-		XMLElementNode *path = new XMLElementNode("path");
-		path->addAttribute("d", oss.str());
-		if (_pattern)
-			path->addAttribute("fill", XMLString("url(#")+_pattern->svgID()+")");
-		else if (_actions->getColor() != Color::BLACK || _savenode)
-			path->addAttribute("fill", _actions->getColor().rgbString());
-		if (_clipStack.top()) {
-			// assign clipping path and clip bounding box
-			path->addAttribute("clip-path", XMLString("url(#clip")+XMLString(_clipStack.topID())+")");
-			BoundingBox clipbox;
-			_clipStack.top()->computeBBox(clipbox);
-			bbox.intersect(clipbox);
-		}
-		if (evenodd)  // SVG default fill rule is "nonzero" algorithm
-			path->addAttribute("fill-rule", "evenodd");
-		if (_opacityalpha < 1)
-			path->addAttribute("fill-opacity", _opacityalpha);
-		if (_xmlnode)
-			_xmlnode->append(path);
-		else {
-			_actions->appendToPage(path);
-			_actions->embed(bbox);
-		}
-		_path.newpath();
+	// compute bounding box
+	BoundingBox bbox;
+	_path.computeBBox(bbox);
+	if (!_actions->getMatrix().isIdentity()) {
+		_path.transform(_actions->getMatrix());
+		if (!_xmlnode)
+			bbox.transform(_actions->getMatrix());
 	}
+	if (_clipStack.clippathLoaded() && _clipStack.top())
+		_path.prepend(*_clipStack.top());
+
+	ostringstream oss;
+	_path.writeSVG(oss, SVGTree::RELATIVE_PATH_CMDS);
+	XMLElementNode *path = new XMLElementNode("path");
+	path->addAttribute("d", oss.str());
+	if (_pattern)
+		path->addAttribute("fill", XMLString("url(#")+_pattern->svgID()+")");
+	else if (_actions->getColor() != Color::BLACK || _savenode)
+		path->addAttribute("fill", _actions->getColor().rgbString());
+	if (_clipStack.top()) {
+		// assign clipping path and clip bounding box
+		path->addAttribute("clip-path", XMLString("url(#clip")+XMLString(_clipStack.topID())+")");
+		BoundingBox clipbox;
+		_clipStack.top()->computeBBox(clipbox);
+		bbox.intersect(clipbox);
+		_clipStack.setClippathLoaded(false);
+	}
+	if (evenodd)  // SVG default fill rule is "nonzero" algorithm
+		path->addAttribute("fill-rule", "evenodd");
+	if (_opacityalpha < 1)
+		path->addAttribute("fill-opacity", _opacityalpha);
+	if (_xmlnode)
+		_xmlnode->append(path);
+	else {
+		_actions->appendToPage(path);
+		_actions->embed(bbox);
+	}
+	_path.clear();
 }
 
 
@@ -658,45 +670,77 @@ void PsSpecialHandler::setpattern (vector<double> &p) {
 
 /** Clears the current clipping path.
  *  @param[in] p not used */
-void PsSpecialHandler::initclip (vector<double> &p) {
-	_clipStack.push();  // push empty path
+void PsSpecialHandler::initclip (vector<double> &) {
+	_clipStack.pushEmptyPath();
 }
 
 
-/** Assigns a new clipping path.
+/** Assigns the current clipping path to the graphics path. */
+void PsSpecialHandler::clippath (std::vector<double>&) {
+	if (!_clipStack.empty()) {
+		_clipStack.setClippathLoaded(true);
+		_path.clear();
+	}
+}
+
+
+/** Assigns a new clipping path to the graphics state using the current path.
+ *  If the graphics state already contains a clipping path, the new one is
+ *  computed by intersecting the current clipping path with the current graphics
+ *  path (see PS language reference, 3rd edition, pp. 193, 542)
  *  @param[in] p not used
  *  @param[in] evenodd true: use even-odd fill algorithm, false: use nonzero fill algorithm */
-void PsSpecialHandler::clip (vector<double> &p, bool evenodd) {
+void PsSpecialHandler::clip (vector<double> &, bool evenodd) {
 	// when this method is called, _path contains the clipping path
-	if (!_path.empty() && _actions) {
-		if (!_actions->getMatrix().isIdentity())
-			_path.transform(_actions->getMatrix());
+	if (_path.empty() || !_actions)
+		return;
 
-		int oldID = _clipStack.topID();
-		_clipStack.replace(_path);
-		int newID = _clipStack.topID();
+	Path::WindingRule windingRule = evenodd ? Path::WR_EVEN_ODD : Path::WR_NON_ZERO;
+	_path.setWindingRule(windingRule);
 
-		ostringstream oss;
-		_path.writeSVG(oss);
-		XMLElementNode *path = new XMLElementNode("path");
-		path->addAttribute("d", oss.str());
-		if (evenodd)
-			path->addAttribute("clip-rule", "evenodd");
+	if (!_actions->getMatrix().isIdentity())
+		_path.transform(_actions->getMatrix());
 
-		XMLElementNode *clip = new XMLElementNode("clipPath");
-		clip->addAttribute("id", XMLString("clip")+XMLString(newID));
-		if (oldID)
-			clip->addAttribute("clip-path", XMLString("url(#clip")+XMLString(oldID)+")");
+	int oldID = _clipStack.topID();
 
-		clip->append(path);
-		_actions->appendToDefs(clip);
+	ostringstream oss;
+	if (!COMPUTE_CLIPPATHS_INTERSECTIONS || oldID < 1) {
+		_clipStack.replace(_path);
+		_path.writeSVG(oss, SVGTree::RELATIVE_PATH_CMDS);
 	}
+	else {
+		// compute the intersection of the current clipping path with the current graphics path
+		Path *oldPath = _clipStack.getPath(oldID);
+		Path intersectedPath(windingRule);
+		PathClipper clipper;
+		clipper.intersect(*oldPath, _path, intersectedPath);
+		_clipStack.replace(intersectedPath);
+		intersectedPath.writeSVG(oss, SVGTree::RELATIVE_PATH_CMDS);
+	}
+
+	XMLElementNode *pathElem = new XMLElementNode("path");
+	pathElem->addAttribute("d", oss.str());
+	if (evenodd)
+		pathElem->addAttribute("clip-rule", "evenodd");
+
+	int newID = _clipStack.topID();
+	XMLElementNode *clipElem = new XMLElementNode("clipPath");
+	clipElem->addAttribute("id", XMLString("clip")+XMLString(newID));
+	if (!COMPUTE_CLIPPATHS_INTERSECTIONS && oldID)
+		clipElem->addAttribute("clip-path", XMLString("url(#clip")+XMLString(oldID)+")");
+
+	clipElem->append(pathElem);
+	_actions->appendToDefs(clipElem);
 }
 
 
 /** Clears current path */
 void PsSpecialHandler::newpath (vector<double> &p) {
-	_path.newpath();
+	bool drawing = (p[0] > 0);
+	if (!drawing || !_clipStack.clippathLoaded()) {
+		_path.clear();
+		_clipStack.setClippathLoaded(false);
+	}
 }
 
 
@@ -799,7 +843,7 @@ void PsSpecialHandler::executed () {
 
 ////////////////////////////////////////////
 
-void PsSpecialHandler::ClippingStack::push () {
+void PsSpecialHandler::ClippingStack::pushEmptyPath () {
 	if (!_stack.empty())
 		_stack.push(Entry(0, -1));
 }
@@ -853,6 +897,24 @@ const PsSpecialHandler::Path* PsSpecialHandler::ClippingStack::top () const {
 }
 
 
+PsSpecialHandler::Path* PsSpecialHandler::ClippingStack::getPath (size_t id) {
+	return (id > 0 && id <= _paths.size()) ? &_paths[id-1] : 0;
+}
+
+
+/** Returns true if the clipping path was loaded into the graphics path (via PS operator 'clippath') */
+bool PsSpecialHandler::ClippingStack::clippathLoaded () const {
+	return !_stack.empty() && _stack.top().cpathLoaded;
+}
+
+
+void PsSpecialHandler::ClippingStack::setClippathLoaded (bool loaded) {
+	if (_stack.empty())
+		return;
+	_stack.top().cpathLoaded = loaded;
+}
+
+
 /** Pops all elements from the stack. */
 void PsSpecialHandler::ClippingStack::clear() {
 	_paths.clear();
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PsSpecialHandler.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PsSpecialHandler.h
index 03d9d8bb7d1..10d091aa688 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/PsSpecialHandler.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/PsSpecialHandler.h
@@ -42,21 +42,25 @@ class PsSpecialHandler : public SpecialHandler, public DVIEndPageListener, prote
 	class ClippingStack
 	{
 		public:
-			void push ();
+			void pushEmptyPath ();
 			void push (const Path &path, int saveID=-1);
 			void replace (const Path &path);
 			void dup (int saveID=-1);
 			void pop (int saveID=-1, bool grestore=false);
 			void clear ();
 			bool empty () const {return _stack.empty();}
+			bool clippathLoaded () const;
+			void setClippathLoaded (bool loaded);
 			const Path* top () const;
+			Path* getPath (size_t id);
 			int topID () const  {return _stack.empty() ? 0 : _stack.top().pathID;}
 
 		private:
 			struct Entry {
-				int pathID;  ///< index referencing a path of the pool
-				int saveID;  ///< if >=0, path was pushed by 'save', and saveID holds the ID of the
-				Entry (int pid, int sid) : pathID(pid), saveID(sid) {}
+				int pathID;        ///< index referencing a path of the pool
+				int saveID;        ///< if >=0, path was pushed by 'save', and saveID holds the ID of the
+				bool cpathLoaded;  ///< true if clipping path was loaded into current path
+				Entry (int pid, int sid) : pathID(pid), saveID(sid), cpathLoaded(false) {}
 			};
 			std::vector<Path> _paths;  ///< pool of all clipping paths
 			std::stack<Entry> _stack;
@@ -75,6 +79,9 @@ class PsSpecialHandler : public SpecialHandler, public DVIEndPageListener, prote
 		void setDviScaleFactor (double dvi2bp) {_previewFilter.setDviScaleFactor(dvi2bp);}
 		void enterBodySection ();
 
+	public:
+		static bool COMPUTE_CLIPPATHS_INTERSECTIONS;
+
 	protected:
 		void initialize ();
 		void moveToDVIPos ();
@@ -88,6 +95,7 @@ class PsSpecialHandler : public SpecialHandler, public DVIEndPageListener, prote
 		void applyscalevals (std::vector<double> &p) {_sx = p[0]; _sy = p[1]; _cos = p[2];}
 		void clip (std::vector<double> &p)           {clip(p, false);}
 		void clip (std::vector<double> &p, bool evenodd);
+		void clippath (std::vector<double> &p);
 		void closepath (std::vector<double> &p);
 		void curveto (std::vector<double> &p);
 		void eoclip (std::vector<double> &p)         {clip(p, true);}
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/RangeMap.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/RangeMap.cpp
index 74871a71e67..e3bfea44eef 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/RangeMap.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/RangeMap.cpp
@@ -71,7 +71,7 @@ bool RangeMap::Range::join (const Range &r) {
 
 
 /** Adds a new number range. The range describes a mapping from c to v(c), where
- *  c \in [cmin,cmax] and v(cmin):=vmin, v(c):=vmin+c-cmin.
+ *  \f$c \in [cmin,cmax]\f$ and \f$v(cmin):=vmin, v(c):=vmin+c-cmin\f$.
  *  @param[in] cmin smallest number in the range
  *  @param[in] cmax largest number in the range
  *  @param[in] vmin map value of cmin */
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/RangeMap.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/RangeMap.h
index 60bf071aff0..60bf071aff0 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/RangeMap.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/RangeMap.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/SVGOutputBase.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/SVGOutputBase.h
index cad892ea068..cad892ea068 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/SVGOutputBase.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/SVGOutputBase.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/SVGTree.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/SVGTree.cpp
index 2432ab42528..084f9f921a9 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/SVGTree.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/SVGTree.cpp
@@ -38,6 +38,7 @@ using namespace std;
 bool SVGTree::CREATE_STYLE=true;
 bool SVGTree::USE_FONTS=true;
 bool SVGTree::CREATE_USE_ELEMENTS=false;
+bool SVGTree::RELATIVE_PATH_CMDS=false;
 double SVGTree::ZOOM_FACTOR=1.0;
 
 
@@ -232,7 +233,7 @@ void SVGTree::appendChar (int c, double x, double y, const Font &font) {
 				double sx = pf->scaledSize()/pf->unitsPerEm();
 				double sy = -sx;
 				ostringstream oss;
-				glyph.writeSVG(oss, sx, sy, x, y);
+				glyph.writeSVG(oss, RELATIVE_PATH_CMDS, sx, sy, x, y);
 				XMLElementNode *glyph_node = new XMLElementNode("path");
 				glyph_node->addAttribute("d", oss.str());
 				if (!rotation.isIdentity())
@@ -321,7 +322,7 @@ static XMLElementNode* createGlyphNode (int c, const PhysicalFont &font, GFGlyph
 		sy = -sx;
 	}
 	ostringstream oss;
-	glyph.writeSVG(oss, sx, sy);
+	glyph.writeSVG(oss, SVGTree::RELATIVE_PATH_CMDS, sx, sy);
 	glyph_node->addAttribute("d", oss.str());
 	return glyph_node;
 }
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/SVGTree.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/SVGTree.h
index 6cd82f6ff39..e8d848aa0ec 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/SVGTree.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/SVGTree.h
@@ -88,10 +88,11 @@ class SVGTree
 		XMLElementNode* rootNode () const {return _root;}
 
 	public:
-		static bool USE_FONTS;    ///< if true, create font references and don't draw paths directly
-		static bool CREATE_STYLE; ///< should style elements and class attributes be used to reference fonts?
+		static bool USE_FONTS;           ///< if true, create font references and don't draw paths directly
+		static bool CREATE_STYLE;        ///<  use style elements and class attributes to reference fonts?
 		static bool CREATE_USE_ELEMENTS; ///< allow generation of <use/> elements?
-		static double ZOOM_FACTOR; ///< factor applied to width/height attribute
+		static bool RELATIVE_PATH_CMDS;  ///< relative path commands rather than absolute ones?
+		static double ZOOM_FACTOR;       ///< factor applied to width/height attribute
 
 	protected:
 		void newTextNode (double x, double y);
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/SignalHandler.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/SignalHandler.cpp
index 6e91a05442d..6e91a05442d 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/SignalHandler.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/SignalHandler.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/SignalHandler.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/SignalHandler.h
index fa69e4129ed..fa69e4129ed 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/SignalHandler.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/SignalHandler.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/SpecialActions.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/SpecialActions.h
index 0222a977955..0222a977955 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/SpecialActions.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/SpecialActions.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/SpecialHandler.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/SpecialHandler.h
index c9779836106..c9779836106 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/SpecialHandler.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/SpecialHandler.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/SpecialManager.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/SpecialManager.cpp
index 9c9b95f62ad..f10946b1d1e 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/SpecialManager.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/SpecialManager.cpp
@@ -131,7 +131,6 @@ void SpecialManager::preprocess (const string &special, SpecialActions *actions)
  *  @param[in] special the special expression
  *  @param[in] dvi2bp factor to convert DVI units to PS points
  *  @param[in] actions actions the special handlers can perform
- *  @param[in] listener object that wants to be notified about the processing state
  *  @return true if the special could be processed successfully
  *  @throw SpecialException in case of errors during special processing */
 bool SpecialManager::process (const string &special, double dvi2bp, SpecialActions *actions) const {
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/SpecialManager.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/SpecialManager.h
index 2ea14da992b..2ea14da992b 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/SpecialManager.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/SpecialManager.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/StreamReader.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/StreamReader.cpp
index 35a1cb1a583..35a1cb1a583 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/StreamReader.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/StreamReader.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/StreamReader.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/StreamReader.h
index 82679254cdc..82679254cdc 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/StreamReader.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/StreamReader.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/StreamWriter.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/StreamWriter.cpp
index 203a1788f87..203a1788f87 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/StreamWriter.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/StreamWriter.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/StreamWriter.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/StreamWriter.h
index f3ba391b044..f3ba391b044 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/StreamWriter.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/StreamWriter.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Subfont.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Subfont.cpp
index c37cd7e7eb6..c37cd7e7eb6 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Subfont.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Subfont.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Subfont.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Subfont.h
index eafa683e30b..eafa683e30b 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Subfont.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Subfont.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/System.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/System.cpp
index 6769f843cae..6769f843cae 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/System.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/System.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/System.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/System.h
index 7200c93f291..7200c93f291 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/System.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/System.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/TFM.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/TFM.cpp
index db36b7f50b6..db36b7f50b6 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/TFM.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/TFM.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/TFM.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/TFM.h
index a7941874b30..a7941874b30 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/TFM.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/TFM.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Terminal.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Terminal.cpp
index e95111d196b..e95111d196b 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Terminal.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Terminal.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Terminal.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Terminal.h
index 08ac7e6300a..08ac7e6300a 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Terminal.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Terminal.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/ToUnicodeMap.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/ToUnicodeMap.cpp
index 7e24fd6fcf7..5d5f1b23b76 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/ToUnicodeMap.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/ToUnicodeMap.cpp
@@ -78,7 +78,7 @@ static bool is_greater_or_equal (UInt32 a, UInt32 b) {return a >= b;}
 /** Adds index to unicode mappings for a given range of character indexes.
  *  @param[in] minIndex lower bound of range to fill
  *  @param[in] maxIndex upper bound of range to fill
- *  @param[in] value first unicode point to add (if possible)
+ *  @param[in] ucp first unicode point to add (if possible)
  *  @param[in,out] used_ucps unicode points already in use
  *  @param[in] ascending if true, fill range from lower to upper bound
  *  @return true on success */
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/ToUnicodeMap.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/ToUnicodeMap.h
index 80ad10dc874..80ad10dc874 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/ToUnicodeMap.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/ToUnicodeMap.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/TpicSpecialHandler.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/TpicSpecialHandler.cpp
index 9f4d38d6189..c460542ca8e 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/TpicSpecialHandler.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/TpicSpecialHandler.cpp
@@ -25,7 +25,9 @@
 #include "Color.h"
 #include "InputBuffer.h"
 #include "InputReader.h"
+#include "GraphicPath.h"
 #include "SpecialActions.h"
+#include "SVGTree.h"
 #include "TpicSpecialHandler.h"
 #include "XMLNode.h"
 #include "XMLString.h"
@@ -118,56 +120,55 @@ void TpicSpecialHandler::drawLines (bool stroke, bool fill, double ddist, Specia
  *  @param[in] ddist length of dashes and gaps
  *  @param[in] actions object providing the actions that can be performed by the SpecialHandler */
 void TpicSpecialHandler::drawSplines (double ddist, SpecialActions *actions) {
-	if (actions && !_points.empty()) {
-		const size_t size = _points.size();
-		if (size < 3)
-			drawLines(true, false, ddist, actions);
+	if (!actions || _points.empty())
+		return;
+	const size_t size = _points.size();
+	if (size < 3)
+		drawLines(true, false, ddist, actions);
+	else {
+		DPair p(actions->getX(), actions->getY());
+		GraphicPath<double> path;
+		path.moveto(p+_points[0]);
+		DPair mid = p+_points[0]+(_points[1]-_points[0])/2.0;
+		path.lineto(mid);
+		actions->embed(p+_points[0]);
+		for (size_t i=1; i < size-1; i++) {
+			const DPair p0 = p+_points[i-1];
+			const DPair p1 = p+_points[i];
+			const DPair p2 = p+_points[i+1];
+			mid = p1+(p2-p1)/2.0;
+			path.conicto(p1, mid);
+			actions->embed(mid);
+			actions->embed((p0+p1*6.0+p2)/8.0, _penwidth);
+		}
+		if (_points[0] == _points[size-1])  // closed path?
+			path.closepath();
 		else {
-			double x = actions->getX();
-			double y = actions->getY();
-			DPair p(x,y);
-			ostringstream oss;
-			oss << 'M' << XMLString(x+_points[0].x()) << ',' << XMLString(y+_points[0].y());
-			DPair mid = p+_points[0]+(_points[1]-_points[0])/2.0;
-			oss << 'L' << XMLString(mid.x()) << ',' << XMLString(mid.y());
-			actions->embed(p+_points[0]);
-			for (size_t i=1; i < size-1; i++) {
-				const DPair p0 = p+_points[i-1];
-				const DPair p1 = p+_points[i];
-				const DPair p2 = p+_points[i+1];
-				mid = p1+(p2-p1)/2.0;
-				oss << 'Q' << XMLString(p1.x()) << ',' << XMLString(p1.y())
-					 << ' ' << XMLString(mid.x()) << ',' << XMLString(mid.y());
-				actions->embed(mid);
-				actions->embed((p0+p1*6.0+p2)/8.0, _penwidth);
-			}
-			if (_points[0] == _points[size-1])  // closed path?
-				oss << 'Z';
-			else {
-				oss << 'L' << XMLString(x+_points[size-1].x()) << ',' << XMLString(y+_points[size-1].y());
-				actions->embed(p+_points[size-1]);
-			}
-
-			Color color = actions->getColor();
-			color *= _fill;
-			XMLElementNode *path = new XMLElementNode("path");
-			if (_fill >= 0) {
-				if (_points[0] != _points[size-1])
-					oss << 'Z';
-				path->addAttribute("fill", color.rgbString());
-			}
-			else
-				path->addAttribute("fill", "none");
+			path.lineto(p+_points[size-1]);
+			actions->embed(p+_points[size-1]);
+		}
 
-			path->addAttribute("d", oss.str());
-			path->addAttribute("stroke", actions->getColor().rgbString());
-			path->addAttribute("stroke-width", XMLString(_penwidth));
-			if (ddist > 0)
-				path->addAttribute("stroke-dasharray", XMLString(ddist));
-			else if (ddist < 0)
-				path->addAttribute("stroke-dasharray", XMLString(_penwidth) + ' ' + XMLString(-ddist));
-			actions->appendToPage(path);
+		Color color = actions->getColor();
+		color *= _fill;
+		XMLElementNode *pathElem = new XMLElementNode("path");
+		if (_fill >= 0) {
+			if (_points[0] != _points[size-1])
+				path.closepath();
+			pathElem->addAttribute("fill", color.rgbString());
 		}
+		else
+			pathElem->addAttribute("fill", "none");
+
+		ostringstream oss;
+		path.writeSVG(oss, SVGTree::RELATIVE_PATH_CMDS);
+		pathElem->addAttribute("d", oss.str());
+		pathElem->addAttribute("stroke", actions->getColor().rgbString());
+		pathElem->addAttribute("stroke-width", XMLString(_penwidth));
+		if (ddist > 0)
+			pathElem->addAttribute("stroke-dasharray", XMLString(ddist));
+		else if (ddist < 0)
+			pathElem->addAttribute("stroke-dasharray", XMLString(_penwidth) + ' ' + XMLString(-ddist));
+		actions->appendToPage(pathElem);
 	}
 	reset();
 }
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/TpicSpecialHandler.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/TpicSpecialHandler.h
index 424721dbffc..424721dbffc 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/TpicSpecialHandler.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/TpicSpecialHandler.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Unicode.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Unicode.cpp
index f0fdde17898..f0fdde17898 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Unicode.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Unicode.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Unicode.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Unicode.h
index 41be47749cd..41be47749cd 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/Unicode.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/Unicode.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/VFActions.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/VFActions.h
index a8e86831fe9..a8e86831fe9 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/VFActions.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/VFActions.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/VFReader.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/VFReader.cpp
index 45d0ed7da27..45d0ed7da27 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/VFReader.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/VFReader.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/VFReader.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/VFReader.h
index f6d9474ccbe..f6d9474ccbe 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/VFReader.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/VFReader.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/VectorStream.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/VectorStream.h
index 92ce8a68437..92ce8a68437 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/VectorStream.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/VectorStream.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/XMLDocument.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/XMLDocument.cpp
index caee2ec7439..caee2ec7439 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/XMLDocument.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/XMLDocument.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/XMLDocument.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/XMLDocument.h
index 4a2dd3e5318..4a2dd3e5318 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/XMLDocument.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/XMLDocument.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/XMLNode.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/XMLNode.cpp
index 1fb40368f19..1fb40368f19 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/XMLNode.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/XMLNode.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/XMLNode.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/XMLNode.h
index 2924e038adb..2924e038adb 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/XMLNode.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/XMLNode.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/XMLString.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/XMLString.cpp
index 4911b6c6a19..4911b6c6a19 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/XMLString.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/XMLString.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/XMLString.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/XMLString.h
index 311d7e535b9..311d7e535b9 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/XMLString.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/XMLString.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/dvisvgm.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/dvisvgm.cpp
index 1e76cf68f57..5af35683355 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/dvisvgm.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/dvisvgm.cpp
@@ -19,6 +19,7 @@
 *************************************************************************/
 
 #include <config.h>
+#include <clipper.hpp>
 #include <cmath>
 #include <fstream>
 #include <iomanip>
@@ -43,6 +44,7 @@
 #include "Message.h"
 #include "PageSize.h"
 #include "PSInterpreter.h"
+#include "PsSpecialHandler.h"
 #include "SignalHandler.h"
 #include "SpecialManager.h"
 #include "SVGOutputBase.h"
@@ -276,6 +278,7 @@ static void print_version (bool extended) {
 			oss << " (" TARGET_SYSTEM ")";
 		int len = oss.str().length();
 		oss << "\n" << string(len, '-') << "\n"
+			"clipper:     " << CLIPPER_VERSION "\n"
 			"freetype:    " << FontEngine::version() << "\n";
 
 		Ghostscript gs;
@@ -333,8 +336,7 @@ int main (int argc, char *argv[]) {
 		return 0;
 	}
 	if (args.list_specials_given()) {
-		SVGOutput out;
-		DVIToSVG dvisvg(cin, out);
+		DVIToSVG::setProcessSpecials();
 		SpecialManager::instance().writeHandlerInfo(cout);
 		return 0;
 	}
@@ -368,11 +370,13 @@ int main (int argc, char *argv[]) {
 	SVGTree::USE_FONTS = !args.no_fonts_given();
 	SVGTree::CREATE_USE_ELEMENTS = args.no_fonts_arg() < 1;
 	SVGTree::ZOOM_FACTOR = args.zoom_arg();
+	SVGTree::RELATIVE_PATH_CMDS = args.relative_given();
 	DVIToSVG::TRACE_MODE = args.trace_all_given() ? (args.trace_all_arg() ? 'a' : 'm') : 0;
 	Message::LEVEL = args.verbosity_arg();
 	PhysicalFont::EXACT_BBOX = args.exact_given();
 	PhysicalFont::KEEP_TEMP_FILES = args.keep_given();
 	PhysicalFont::METAFONT_MAG = args.mag_arg();
+	PsSpecialHandler::COMPUTE_CLIPPATHS_INTERSECTIONS = args.clipjoin_given();
 	XMLString::DECIMAL_PLACES = max(0, min(6, args.precision_arg()));
 	if (!HtmlSpecialHandler::setLinkMarker(args.linkmark_arg()))
 		Message::wstream(true) << "invalid argument '"+args.linkmark_arg()+"' supplied for option --linkmark\n";
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/gzstream.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/gzstream.cpp
index 2893c299891..2893c299891 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/gzstream.cpp
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/gzstream.cpp
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/gzstream.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/gzstream.h
index 60f38c4fac7..60f38c4fac7 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/gzstream.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/gzstream.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/iapi.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/iapi.h
index 8e29d938d03..8e29d938d03 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/iapi.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/iapi.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/ierrors.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/ierrors.h
index 3184341177e..3184341177e 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/ierrors.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/ierrors.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/macros.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/macros.h
index 73217c763e0..73217c763e0 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/macros.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/macros.h
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/options.dtd b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/options.dtd
index d8444c94c9f..d8444c94c9f 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/options.dtd
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/options.dtd
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/options.xml b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/options.xml
index d1029f7768b..35b8618ff54 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/options.xml
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/options.xml
@@ -46,6 +46,9 @@
 				<arg type="string" name="size" default="min"/>
 				<description>set size of bounding box</description>
 			</option>
+			<option long="clipjoin" short="j">
+				<description>compute intersection of clipping paths</description>
+			</option>
 			<option long="linkmark" short="L">
 				<arg type="string" name="style" default="box"/>
 				<description>select how to mark hyperlinked areas</description>
@@ -58,6 +61,9 @@
 				<arg type="int" name="number" default="0"/>
 				<description>set number of decimal points (0-6)</description>
 			</option>
+			<option long="relative" short="R">
+				<description>create relative path commands</description>
+			</option>
 			<option long="stdout" short="s">
 				<description>write SVG output to stdout</description>
 			</option>
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.8/src/psdefs.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/psdefs.cpp
new file mode 100644
index 00000000000..a9fd027fc97
--- /dev/null
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/psdefs.cpp
@@ -0,0 +1,87 @@
+/*************************************************************************
+** psdefs.cpp                                                           **
+**                                                                      **
+** This file is part of dvisvgm -- the DVI to SVG converter             **
+** Copyright (C) 2005-2014 Martin Gieseking <martin.gieseking@uos.de>   **
+**                                                                      **
+** This program is free software; you can redistribute it and/or        **
+** modify it under the terms of the GNU General Public License as       **
+** published by the Free Software Foundation; either version 3 of       **
+** the License, or (at your option) any later version.                  **
+**                                                                      **
+** This program is distributed in the hope that it will be useful, but  **
+** WITHOUT ANY WARRANTY; without even the implied warranty of           **
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the         **
+** GNU General Public License for more details.                         **
+**                                                                      **
+** You should have received a copy of the GNU General Public License    **
+** along with this program; if not, see <http://www.gnu.org/licenses/>. **
+*************************************************************************/
+
+#include "PSInterpreter.h"
+
+const char *PSInterpreter::PSDEFS =
+"3 dict dup begin/Install{matrix setmatrix}def/HWResolution[72 72]def/PageSize["
+"10000 10000]def end setpagedevice/@dodraw true store/@patcnt 0 store/@SD syste"
+"mdict def/@UD userdict def true setglobal @SD/:save @SD/save get put @SD/:rest"
+"ore @SD/restore get put @SD/:gsave @SD/gsave get put @SD/:grestore @SD/grestor"
+"e get put @SD/:grestoreall @SD/grestoreall get put @SD/:newpath @SD/newpath ge"
+"t put @SD/:stroke @SD/stroke get put @SD/:fill @SD/fill get put @SD/:eofill @S"
+"D/eofill get put @SD/:clip @SD/clip get put @SD/:eoclip @SD/eoclip get put @SD"
+"/:charpath @SD/charpath get put @SD/:show @SD/show get put @SD/.setopacityalph"
+"a known not{@SD/.setopacityalpha{pop}put}if @SD/prseq{-1 1{-1 roll =only( )pri"
+"nt}for(\\n)print}put @SD/prcmd{( )exch(\\ndvi.)3{print}repeat prseq}put @SD/cv"
+"xall{{cvx}forall}put @SD/defpr{[exch[/copy @SD]cvxall 5 -1 roll dup 6 1 roll[/"
+"get/exec]cvxall 6 -1 roll dup 7 1 roll 4 -1 roll dup 5 1 roll dup length strin"
+"g cvs/prcmd cvx]cvx def}put @SD/querypos{{currentpoint}stopped{$error/newerror"
+" false put}{2(querypos)prcmd}ifelse}put @SD/applyscalevals{1 0 transform 0 0 t"
+"ransform 3 -1 roll sub dup mul 3 1 roll sub dup mul add sqrt 0 1 transform 0 0"
+" transform 3 -1 roll sub dup mul 3 1 roll sub dup mul add sqrt 1 0 transform d"
+"up mul exch dup dup mul 3 -1 roll add sqrt div 3(applyscalevals)prcmd}put @SD/"
+"prpath{{2(moveto)prcmd}{2(lineto)prcmd}{6(curveto)prcmd}{0(closepath)prcmd}pat"
+"hforall}put @SD/charpath{/@dodraw false store :charpath/@dodraw true store}put"
+" @SD/show{@dodraw{dup :gsave currentpoint :newpath moveto true charpath eofill"
+" :grestore/@dodraw false store :show/@dodraw true store}if}put @SD/newpath{:ne"
+"wpath 0 1(newpath)prcmd}put @SD/stroke{@dodraw{1 1(newpath)prcmd prpath 0(stro"
+"ke)prcmd :newpath}{:stroke}ifelse}put @SD/fill{@dodraw{1 1(newpath)prcmd prpat"
+"h 0(fill)prcmd :newpath}{:fill}ifelse}put @SD/eofill{@dodraw{1 1(newpath)prcmd"
+" prpath 0(eofill)prcmd :newpath}{:eofill}ifelse}put @SD/clip{:clip 0 1(newpath"
+")prcmd prpath 0(clip)prcmd}put @SD/eoclip{:eoclip 1 1(newpath)prcmd prpath 0(e"
+"oclip)prcmd}put @SD/bop{pop pop}put/@rect{4 -2 roll moveto exch dup 0 rlineto "
+"exch 0 exch rlineto neg 0 rlineto closepath}bind def/@rectcc{4 -2 roll moveto "
+"2 copy 0 lt exch 0 lt xor{dup 0 exch rlineto exch 0 rlineto neg 0 exch rlineto"
+"}{exch dup 0 rlineto exch 0 exch rlineto neg 0 rlineto}ifelse closepath}bind d"
+"ef @SD/rectclip{:newpath dup type/arraytype eq{aload length 4 idiv{@rectcc}rep"
+"eat}{@rectcc}ifelse clip :newpath}put @SD/rectfill{gsave :newpath dup type/arr"
+"aytype eq{aload length 4 idiv{@rectcc}repeat}{@rectcc}ifelse fill grestore}put"
+" @SD/rectstroke{gsave :newpath dup type/arraytype eq{aload length 4 idiv{@rect"
+"}repeat}{@rect}ifelse stroke grestore}put false setglobal @SD readonly pop/ini"
+"tclip 0 defpr/clippath 0 defpr/sysexec{@SD exch get exec}def/adddot{dup length"
+" 1 add string dup 0 46 put dup 3 -1 roll 1 exch putinterval}def/setlinewidth{d"
+"up/setlinewidth sysexec applyscalevals 1(setlinewidth)prcmd}def/setlinecap 1 d"
+"efpr/setlinejoin 1 defpr/setmiterlimit 1 defpr/setdash{mark 3 1 roll 2 copy/se"
+"tdash sysexec applyscalevals exch aload length 1 add -1 roll counttomark(setda"
+"sh)prcmd pop}def/setgstate{currentlinewidth 1(setlinewidth)prcmd currentlineca"
+"p 1(setlinecap)prcmd currentlinejoin 1(setlinejoin)prcmd currentmiterlimit 1(s"
+"etmiterlimit)prcmd currentrgbcolor 3(setrgbcolor)prcmd 6 array currentmatrix a"
+"load pop 6(setmatrix)prcmd currentdash mark 3 1 roll exch aload length 1 add -"
+"1 roll counttomark(setdash)prcmd pop}def/save{@UD begin/@saveID vmstatus pop p"
+"op def end :save @saveID 1(save)prcmd}def/restore{:restore setgstate @UD/@save"
+"ID known{@UD begin @saveID end}{0}ifelse 1(restore)prcmd}def/gsave 0 defpr/gre"
+"store{:grestore setgstate 0(grestore)prcmd}def/grestoreall{:grestoreall setsta"
+"te 0(grestoreall)prcmd}def/rotate{dup type/arraytype ne{dup 1(rotate)prcmd}if/"
+"rotate sysexec}def/scale{dup type/arraytype ne{2 copy 2(scale)prcmd}if/scale s"
+"ysexec}def/translate{dup type/arraytype ne{2 copy 2(translate)prcmd}if/transla"
+"te sysexec}def/setmatrix{dup/setmatrix sysexec aload pop 6(setmatrix)prcmd}def"
+"/initmatrix{matrix setmatrix}def/concat{matrix currentmatrix matrix concatmatr"
+"ix setmatrix}def/makepattern{gsave <</mx 3 -1 roll >> begin dup/XUID[1000000 @"
+"patcnt]put mx/makepattern sysexec dup dup begin PatternType @patcnt BBox aload"
+" pop XStep YStep PaintType mx aload pop 15(makepattern)prcmd :newpath matrix s"
+"etmatrix PaintProc 0 1(makepattern)prcmd end/@patcnt @patcnt 1 add store end g"
+"restore}def/setpattern{begin PatternType 1 eq{PaintType 1 eq{XUID aload pop ex"
+"ch pop 1}{:gsave[currentcolorspace aload length -1 roll pop]setcolorspace/setc"
+"olor sysexec XUID aload pop exch pop currentrgbcolor :grestore 4}ifelse(setpat"
+"tern)prcmd}{/setpattern sysexec}ifelse end}def/setcolor{dup type/dicttype eq{s"
+"etpattern}{/setcolor sysexec}ifelse}def/setgray 1 defpr/setcmykcolor 4 defpr/s"
+"ethsbcolor 3 defpr/setrgbcolor 3 defpr/.setopacityalpha{dup/.setopacityalpha s"
+"ysexec 1(setopacityalpha)prcmd}def ";
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/types.h b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/types.h
index 1e1daef928c..1e1daef928c 100644
--- a/Build/source/texk/dvisvgm/dvisvgm-1.7/src/types.h
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.8/src/types.h
diff --git a/Build/source/texk/dvisvgm/version.ac b/Build/source/texk/dvisvgm/version.ac
index 8a58a3a8c3c..83c5f06fa1d 100644
--- a/Build/source/texk/dvisvgm/version.ac
+++ b/Build/source/texk/dvisvgm/version.ac
@@ -8,4 +8,4 @@ dnl
 dnl --------------------------------------------------------
 dnl
 dnl  m4-include this file to define the current dvisvgm version
-m4_define([dvisvgm_version], [1.7])
+m4_define([dvisvgm_version], [1.8])