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+%--------------------------------------------
+%
+% Package pgfplots
+%
+% Provides a user-friendly interface to create function plots (normal
+% plots, semi-logplots and double-logplots).
+%
+% It is based on Till Tantau's PGF package.
+%
+% Copyright 2007-2012 by Christian Feuersänger.
+%
+% 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/>.
+%
+%--------------------------------------------
+
+\newcount\c@pgfplotslibrarysurf@streamlen
+
+\def\pgfplotslibrarysurf@initstream{%
+ % binary doesn't work due to limitations of DVI.
+ % We NEED an ASCII encoding.
+ %
+ \def\pgfplotslibrarysurf@filter@encode{ASCIIHexEncode}%
+ \def\pgfplotslibrarysurf@filter@decode{ASCIIHexDecode}%
+ \global\c@pgfplotslibrarysurf@streamlen=0 %
+}%
+
+\def\pgfplotslibrarysurf@advancestreamlen#1{%
+ \global\advance\c@pgfplotslibrarysurf@streamlen by#1\relax
+}%
+
+% The lowlevel call for surface shadings. It uses a pattern type 2
+% dictionary as fill color and has thus several things to do. This is
+% a little bit more complicated than using the '/sh' operator (as
+% other pgf shadings do): the surface shading must be positioned
+% exactly at the requested coordinates, otherwise it is quite useless.
+%
+% Since shadings are *not* affected by changes in the canvas
+% transformation matrix (shifts, rotations etc), it is necessary to
+% pack the shading into a separate xform object which is then rotated
+% and translated correctly.
+%
+% There is just one more transformation necessary: the shift inside of
+% the xform. This shift is done using changes in the canvas
+% transformation matrix and it is UNDONE in the /Matrix argument of
+% the pattern dictionary. This last step can't be done with the /sh
+% operator which is why I am using pattern dictionaries.
+\def\pgfplotslibrarysurfdraw{%
+ \begingroup
+ \setbox\pgfutil@tempboxa=\hbox
+ {%
+ \pgfpicture
+ \pgfplotssys@do@surfshading@fillpaths\pgfplots@loc@TMPa%
+ \global\let\pgfplots@glob@TMPa=\pgfplots@loc@TMPa
+ \pgfpathrectanglecorners
+ {\pgfplotslibrarysurf@corner@sw}
+ {\pgfplotslibrarysurf@corner@ne}%
+ \pgfplotslibrarysurfusepath
+ \endpgfpicture
+ }%
+ %
+ % NOTE : this code was broken due to some driver in pgf. I fixed
+ % that and brought the fix with pgfplots.
+ %
+ % for some reason, dvipdfmx requires to move the XObject
+ % declaration out of the current stream.
+ % Perhaps I should rephrase and say that for some reason, this appears to be
+ % unnecessary for pdftex.
+ %
+ % FIXME : this might have N^2 time due to "box-append"!
+ \pgfutil@insertatbegincurrentpagefrombox
+ {%
+ \special{pdf: bxobj @pgfplotsX\pgfplotslibrarysurf@count\space
+ width \the\wd\pgfutil@tempboxa\space height \the\ht\pgfutil@tempboxa}%
+ \special{pdf: put @resources
+ % write the pattern resource dictionary of the XObject
+ % (only!):
+ << /Pattern << \pgfplots@glob@TMPa >> >>
+ }%
+ %
+ % no need to add the pattern to the page's resource list!
+ % we do not need this:
+ %\pgfutil@addpdfresource@patterns{\pgfplots@glob@TMPa}%
+ \leavevmode
+ \box\pgfutil@tempboxa
+ \special{pdf: exobj}%
+ }%
+ \endgroup
+ \special{pdf: uxobj @pgfplotsX\pgfplotslibrarysurf@count\space}%
+ \pgfplotsutil@advancestringcounter@global\pgfplotslibrarysurf@count
+}
+
+% To be used inside of a pgfpicture.
+%
+% #1: a macro name. The contents of this macro needs to be written
+% into the pdf pattern dictionary contained in the pdf resources of
+% the current context. The current context is either the current page
+% or an xform object.
+%
+%
+\def\pgfplotssys@do@surfshading@fillpaths#1{%
+ % it contain the BINARY bytes. But it is ASCII encoded, see docs of ASCIIHexEncode.
+ \global\multiply\c@pgfplotslibrarysurf@streamlen by2 %
+ %
+ \def\pgfplots@loc@TMPa{%
+ % stream length will be computed automatically
+ /ShadingType \pgfplotslibrarysurf@type\space
+ /BitsPerCoordinate \pgfplotslibrarysurf@bitspercoordinate\space
+ /BitsPerComponent \pgfplotslibrarysurf@bitspercomponent\space
+ \if5\pgfplotslibrarysurf@type
+ /VerticesPerRow \pgfkeysvalueof{/pgfplots/surf shading/cols}
+ \else
+ /BitsPerFlag 8
+ \fi
+ /ColorSpace /Device\pgfplotslibrarysurf@colorspace
+ /Decode [\pgfplotslibrarysurf@decode]
+ \ifpgfplotslibrarysurf@usecolormap
+ /Function \pgfkeysvalueof{/pgfplots/surf shading/colormap}
+ \fi
+ \ifx\pgfplotslibrarysurf@filter@decode\pgfutil@empty
+ \else
+ /Filter /\pgfplotslibrarysurf@filter@decode\space
+ \fi
+ /Length \the\c@pgfplotslibrarysurf@streamlen
+ }%
+ %
+ \pgf@process{\pgfpointdiff{\pgfplotslibrarysurf@corner@sw}{\pgfkeysvalueof{/pgfplots/surf shading/anchor}}}%
+ \pgf@sys@bp@correct\pgf@x%
+ \pgf@sys@bp@correct\pgf@y%
+ %
+ %\noexpand\pgfutil@insertatbegincurrentpagefrombox
+ {%
+ \special{pdf: object @pgfplotsShading\pgfplotslibrarysurf@count\space << \pgfplots@loc@TMPa >>
+ stream^^J%
+ \pgfplotslibrarysurf@binarystream
+ endstream
+ }%
+ \special{pdf: close @pgfplotsShading\pgfplotslibrarysurf@count\space }%
+ \special{pdf: object @pgfplotsPattern\pgfplotslibrarysurf@count\space <<
+ /Type /Pattern
+ /PatternType 2
+ % /Matrix [\pgf@pt@aa\space\pgf@pt@ab\space\pgf@pt@ba\space\pgf@pt@bb\space\pgf@sys@tonumber\pgf@pt@x\space\pgf@sys@tonumber\pgf@pt@y]
+ % FIXME: INCORPORATE TIKZ CM
+ /Matrix [1 0 0 1 \pgf@sys@tonumber\pgf@x\space \pgf@sys@tonumber\pgf@y] %226.533 518.141]
+ %--------------------------------------------------
+ % /ExtGState
+ % <<
+ % /LW 2
+ % /OP true
+ % /OPM 1
+ % >>
+ %--------------------------------------------------
+ /Shading @pgfplotsShading\pgfplotslibrarysurf@count
+ >>
+ }%
+ \special{pdf: close @pgfplotsPattern\pgfplotslibrarysurf@count\space }%
+ }%
+ \pgfplots@loc@TMPb
+ \edef#1{%
+ /pgfplotsSurface\pgfplotslibrarysurf@count\space @pgfplotsPattern\pgfplotslibrarysurf@count
+ }%
+ %
+ % I inlined \pgfsys@setpatterncolored here because it appears to be
+ % natural - and in order to bring this driver to PGF 2.00 (which
+ % would fail otherwise)
+ \pgfsysprotocol@literal{/Pattern cs /pgfplotsSurface\pgfplotslibrarysurf@count\space scn}%
+}
+
+\endinput
+% vi: ft=tex