summaryrefslogtreecommitdiff
path: root/Build/source/texk/kpathsea/magstep.h
diff options
context:
space:
mode:
authorKarl Berry <karl@freefriends.org>2006-01-17 21:41:51 +0000
committerKarl Berry <karl@freefriends.org>2006-01-17 21:41:51 +0000
commit487ca4806cc046076293cf6cc5fbba0db282bac7 (patch)
tree847b412ab5158dd7bdd7ed7e5a4cc3fbca94be32 /Build/source/texk/kpathsea/magstep.h
parenta3d3111bfe26b8e5f5bc6049dfb2a4ca2edc7881 (diff)
texk 1
git-svn-id: svn://tug.org/texlive/trunk@1485 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/texk/kpathsea/magstep.h')
-rw-r--r--Build/source/texk/kpathsea/magstep.h48
1 files changed, 48 insertions, 0 deletions
diff --git a/Build/source/texk/kpathsea/magstep.h b/Build/source/texk/kpathsea/magstep.h
new file mode 100644
index 00000000000..78672d8a25f
--- /dev/null
+++ b/Build/source/texk/kpathsea/magstep.h
@@ -0,0 +1,48 @@
+/* magstep.h: declaration for magstep fixing.
+
+ Copyright 1999, 2005 Olaf Weber.
+ Copyright 1994 Karl Berry.
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+*/
+
+#ifndef KPATHSEA_MAGSTEP_H
+#define KPATHSEA_MAGSTEP_H
+
+#include <kpathsea/c-proto.h>
+#include <kpathsea/types.h>
+
+/* If DPI is close enough to some magstep of BDPI, return the true dpi
+ value, and the magstep found (or zero) in M_RET (if
+ non-null). ``Close enough'' means within one pixel.
+
+ M_RET is slightly encoded: the least significant bit is on for a
+ half-magstep, off otherwise. Thus, a returned M_RET of 1 means
+ \magstephalf, i.e., sqrt(1.2), i.e., 1.09544. Put another way,
+ return twice the number of magsteps.
+
+ In practice, this matters for magstephalf. Floating-point computation
+ with the fixed-point DVI representation leads to 328 (for BDPI ==
+ 300); specifying `at 11pt' yields 330; the true \magstephalf is 329
+ (that's what you get if you run Metafont with mag:=magstep(.5)).
+
+ The time to call this is after you read the font spec from the DVI
+ file, but before you look up any files -- do the usual floating-point
+ computations, and then fix up the result. */
+
+extern KPSEDLL unsigned kpse_magstep_fix P3H(unsigned dpi, unsigned bdpi, int *m_ret);
+
+#endif /* not KPATHSEA_MAGSTEP_H */