% \iffalse meta-comment
%
%% File: l3backend-graphics.dtx
%
% Copyright (C) 2019-2024 The LaTeX Project
%
% It may be distributed and/or modified under the conditions of the
% LaTeX Project Public License (LPPL), either version 1.3c of this
% license or (at your option) any later version. The latest version
% of this license is in the file
%
% https://www.latex-project.org/lppl.txt
%
% This file is part of the "l3backend bundle" (The Work in LPPL)
% and all files in that bundle must be distributed together.
%
% -----------------------------------------------------------------------
%
% The development version of the bundle can be found at
%
% https://github.com/latex3/latex3
%
% for those people who are interested.
%
%<*driver>
\documentclass[full,kernel]{l3doc}
\begin{document}
\DocInput{\jobname.dtx}
\end{document}
%</driver>
% \fi
%
% \title{^^A
% The \pkg{l3backend-graphics} module\\ Backend graphics support^^A
% }
%
% \author{^^A
% The \LaTeX{} Project\thanks
% {^^A
% E-mail:
% \href{mailto:latex-team@latex-project.org}
% {latex-team@latex-project.org}^^A
% }^^A
% }
%
% \date{Released 2024-05-08}
%
% \maketitle
%
% \begin{documentation}
%
% \end{documentation}
%
% \begin{implementation}
%
% \section{\pkg{l3backend-graphics} implementation}
%
% \begin{macrocode}
%<*package>
%<@@=graphics>
% \end{macrocode}
%
% \begin{macro}{\@@_backend_loaded:n}
% To deal with file load ordering. Plain users are on their own.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_loaded:n #1
{
\cs_if_exist:NTF \hook_gput_code:nnn
{
\hook_gput_code:nnn
{ package / l3graphics / after }
{ backend }
{#1}
}
{#1}
}
% \end{macrocode}
% \end{macro}
%
% \subsection{\texttt{dvips} backend}
%
% \begin{macrocode}
%<*dvips>
% \end{macrocode}
%
% \begin{variable}[no-user-doc]{\l_graphics_search_ext_seq}
% \begin{macrocode}
\@@_backend_loaded:n
{ \seq_set_from_clist:Nn \l_graphics_search_ext_seq { .eps , .ps } }
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\@@_backend_getbb_eps:n, \@@_backend_getbb_ps:n}
% Simply use the generic function.
% \begin{macrocode}
\@@_backend_loaded:n
{
\cs_new_eq:NN \@@_backend_getbb_eps:n \@@_read_bb:n
\cs_new_eq:NN \@@_backend_getbb_ps:n \@@_read_bb:n
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_backend_include_eps:n, \@@_backend_include_ps:n}
% The special syntax is relatively clear here: remember we need PostScript
% sizes here.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_include_eps:n #1
{
\__kernel_backend_literal:e
{
PSfile = #1 \c_space_tl
llx = \dim_to_decimal_in_bp:n \l_@@_llx_dim \c_space_tl
lly = \dim_to_decimal_in_bp:n \l_@@_lly_dim \c_space_tl
urx = \dim_to_decimal_in_bp:n \l_@@_urx_dim \c_space_tl
ury = \dim_to_decimal_in_bp:n \l_@@_ury_dim
}
}
\cs_new_eq:NN \@@_backend_include_ps:n \@@_backend_include_eps:n
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_backend_get_pagecount:n}
% \begin{macrocode}
\@@_backend_loaded:n
{ \cs_new_eq:NN \@@_backend_get_pagecount:n \@@_get_pagecount:n }
% \end{macrocode}
% \end{macro}
%
% \begin{macrocode}
%</dvips>
% \end{macrocode}
%
% \subsection{\LuaTeX{} and \pdfTeX{} backends}
%
% \begin{macrocode}
%<*luatex|pdftex>
% \end{macrocode}
%
% \begin{variable}[no-user-doc]{\l_graphics_search_ext_seq}
% \begin{macrocode}
\@@_backend_loaded:n
{
\seq_set_from_clist:Nn
\l_graphics_search_ext_seq
{ .pdf , .eps , .ps , .png , .jpg , .jpeg }
}
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_attr_tl}
% In PDF mode, additional attributes of an graphic (such as page number) are
% needed both to obtain the bounding box and when inserting the graphic: this
% occurs as the graphic dictionary approach means they are read as part of
% the bounding box operation. As such, it is easier to track additional
% attributes using a dedicated |tl| rather than build up the same data
% twice.
% \begin{macrocode}
\tl_new:N \l_@@_attr_tl
% \end{macrocode}
% \end{variable}
%
% \begin{macro}
% {
% \@@_backend_getbb_jpg:n ,
% \@@_backend_getbb_jpeg:n ,
% \@@_backend_getbb_pdf:n ,
% \@@_backend_getbb_png:n
% }
% \begin{macro}
% {
% \@@_backend_getbb_auxi:n ,
% \@@_backend_getbb_auxii:n ,
% \@@_backend_getbb_auxiii:n
% }
% \begin{macro}[EXP]{\@@_backend_dequote:w}
% Getting the bounding box here requires us to box up the graphic and
% measure it. To deal with the difference in feature support in bitmap
% and vector graphics but keeping the common parts, there is a little work
% to do in terms of auxiliaries. The key here is to notice that we need
% two forms of the attributes: a \enquote{short} set to allow us to
% track for caching, and the full form to pass to the primitive.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_getbb_jpg:n #1
{
\int_zero:N \l_@@_page_int
\tl_clear:N \l_@@_pagebox_tl
\tl_set:Ne \l_@@_attr_tl
{
\tl_if_empty:NF \l_@@_decodearray_str
{ :D \l_@@_decodearray_str }
\bool_if:NT \l_@@_interpolate_bool
{ :I }
\str_if_empty:NF \l_@@_pdf_str
{ :X \l_@@_pdf_str }
}
\@@_backend_getbb_auxi:n {#1}
}
\cs_new_eq:NN \@@_backend_getbb_jpeg:n \@@_backend_getbb_jpg:n
\cs_new_eq:NN \@@_backend_getbb_png:n \@@_backend_getbb_jpg:n
\cs_new_protected:Npn \@@_backend_getbb_pdf:n #1
{
\tl_clear:N \l_@@_decodearray_str
\bool_set_false:N \l_@@_interpolate_bool
\tl_set:Ne \l_@@_attr_tl
{
: \l_@@_pagebox_tl
\int_compare:nNnT \l_@@_page_int > 1
{ :P \int_use:N \l_@@_page_int }
\str_if_empty:NF \l_@@_pdf_str
{ :X \l_@@_pdf_str }
}
\@@_backend_getbb_auxi:n {#1}
}
\cs_new_protected:Npn \@@_backend_getbb_auxi:n #1
{
\@@_bb_restore:eF { #1 \l_@@_attr_tl }
{ \@@_backend_getbb_auxii:n {#1} }
}
% \end{macrocode}
% Measuring the graphic is done by boxing up: for PDF graphics we could
% use |\tex_pdfximagebbox:D|, but if doesn't work for other types.
% As the box always starts at $(0,0)$ there is no need to worry about
% the lower-left position. Quotes need to be \emph{removed} as \LuaTeX{}
% does not like them here.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_getbb_auxii:n #1
{
\exp_args:Ne \@@_backend_getbb_auxiii:n
{ \@@_backend_dequote:w #1 " #1 " \s_@@_stop }
\int_const:cn { c_@@_ #1 \l_@@_attr_tl _int }
{ \tex_the:D \tex_pdflastximage:D }
\@@_bb_save:e { #1 \l_@@_attr_tl }
}
\cs_new_protected:Npn \@@_backend_getbb_auxiii:n #1
{
\tex_immediate:D \tex_pdfximage:D
\bool_lazy_any:nT
{
{ \l_@@_interpolate_bool }
{ ! \tl_if_empty_p:N \l_@@_decodearray_str }
{ ! \str_if_empty_p:N \l_@@_pdf_str }
}
{
attr ~
{
\tl_if_empty:NF \l_@@_decodearray_str
{ /Decode~[ \l_@@_decodearray_str ] }
\bool_if:NT \l_@@_interpolate_bool
{ /Interpolate~true }
\l_@@_pdf_str
}
}
\int_compare:nNnT \l_@@_page_int > 0
{ page ~ \int_use:N \l_@@_page_int }
\tl_if_empty:NF \l_@@_pagebox_tl
{ \l_@@_pagebox_tl }
{#1}
\hbox_set:Nn \l_@@_internal_box
{ \tex_pdfrefximage:D \tex_pdflastximage:D }
\dim_set:Nn \l_@@_urx_dim { \box_wd:N \l_@@_internal_box }
\dim_set:Nn \l_@@_ury_dim { \box_ht:N \l_@@_internal_box }
}
\cs_new:Npn \@@_backend_dequote:w #1 " #2 " #3 \s_@@_stop {#2}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}
% {
% \@@_backend_include_jpg:n ,
% \@@_backend_include_jpeg:n ,
% \@@_backend_include_pdf:n ,
% \@@_backend_include_png:n
% }
% Images are already loaded for the measurement part of the code, so
% inclusion is straight-forward, with only any attributes to worry about. The
% latter carry through from determination of the bounding box.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_include_jpg:n #1
{
\tex_pdfrefximage:D
\int_use:c { c_@@_ #1 \l_@@_attr_tl _int }
}
\cs_new_eq:NN \@@_backend_include_jpeg:n \@@_backend_include_jpg:n
\cs_new_eq:NN \@@_backend_include_pdf:n \@@_backend_include_jpg:n
\cs_new_eq:NN \@@_backend_include_png:n \@@_backend_include_jpg:n
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_backend_getbb_eps:n, \@@_backend_getbb_ps:n}
% \begin{macro}{\@@_backend_getbb_eps:nm}
% \begin{macro}{\@@_backend_include_eps:n, \@@_backend_include_ps:n}
% \begin{variable}
% {\l_@@_backend_dir_str, \l_@@_backend_name_str, \l_@@_backend_ext_str}
% EPS graphics may be included in \LuaTeX{}/pdfTeX{} by conversion to
% PDF: this requires restricted shell escape. Modelled on the \pkg{epstopdf}
% \LaTeXe{} package, but simplified, conversion takes place here if we have
% shell access.
% \begin{macrocode}
\sys_if_shell:T
{
\str_new:N \l_@@_backend_dir_str
\str_new:N \l_@@_backend_name_str
\str_new:N \l_@@_backend_ext_str
\cs_new_protected:Npn \@@_backend_getbb_eps:n #1
{
\file_parse_full_name:nNNN {#1}
\l_@@_backend_dir_str
\l_@@_backend_name_str
\l_@@_backend_ext_str
\exp_args:Ne \@@_backend_getbb_eps:nn
{
\exp_args:Ne \__kernel_file_name_quote:n
{
\l_@@_backend_name_str
- \str_tail:N \l_@@_backend_ext_str
-converted-to.pdf
}
}
{#1}
}
\cs_new_eq:NN \@@_backend_getbb_ps:n \@@_backend_getbb_eps:n
\cs_new_protected:Npn \@@_backend_getbb_eps:nn #1#2
{
\file_compare_timestamp:nNnT {#2} > {#1}
{
\sys_shell_now:n
{ repstopdf ~ #2 ~ #1 }
}
\tl_set:Nn \l_@@_final_name_str {#1}
\@@_backend_getbb_pdf:n {#1}
}
\cs_new_protected:Npn \@@_backend_include_eps:n #1
{
\file_parse_full_name:nNNN {#1}
\l_@@_backend_dir_str \l_@@_backend_name_str \l_@@_backend_ext_str
\exp_args:Ne \@@_backend_include_pdf:n
{
\exp_args:Ne \__kernel_file_name_quote:n
{
\l_@@_backend_name_str
- \str_tail:N \l_@@_backend_ext_str
-converted-to.pdf
}
}
}
\cs_new_eq:NN \@@_backend_include_ps:n \@@_backend_include_eps:n
}
% \end{macrocode}
% \end{variable}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_backend_get_pagecount:n}
% Simply load and store.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_get_pagecount:n #1
{
\tex_pdfximage:D {#1}
\int_const:cn { c_@@_ #1 _pages_int }
{ \int_use:N \tex_pdflastximagepages:D }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macrocode}
%</luatex|pdftex>
% \end{macrocode}
%
% \subsection{\texttt{dvipdfmx} backend}
%
% \begin{macrocode}
%<*dvipdfmx|xetex>
% \end{macrocode}
%
% \begin{variable}[no-user-doc]{\l_graphics_search_ext_seq}
% \begin{macrocode}
\@@_backend_loaded:n
{
\seq_set_from_clist:Nn \l_graphics_search_ext_seq
{ .pdf , .eps , .ps , .png , .jpg , .jpeg , .bmp }
}
% \end{macrocode}
% \end{variable}
%
% \begin{macro}
% {
% \@@_backend_getbb_eps:n , \@@_backend_getbb_ps:n ,
% \@@_backend_getbb_jpg:n , \@@_backend_getbb_jpeg:n ,
% \@@_backend_getbb_pdf:n , \@@_backend_getbb_png:n ,
% \@@_backend_getbb_bmp:n
% }
% Simply use the generic functions: only for \texttt{dvipdfmx} in the
% extraction cases.
% \begin{macrocode}
\@@_backend_loaded:n
{
\cs_new_eq:NN \@@_backend_getbb_eps:n \@@_read_bb:n
\cs_new_eq:NN \@@_backend_getbb_ps:n \@@_read_bb:n
}
%<*dvipdfmx>
\cs_new_protected:Npn \@@_backend_getbb_jpg:n #1
{
\int_zero:N \l_@@_page_int
\tl_clear:N \l_@@_pagebox_tl
\@@_extract_bb:n {#1}
}
\cs_new_eq:NN \@@_backend_getbb_jpeg:n \@@_backend_getbb_jpg:n
\cs_new_eq:NN \@@_backend_getbb_png:n \@@_backend_getbb_jpg:n
\cs_new_eq:NN \@@_backend_getbb_bmp:n \@@_backend_getbb_jpg:n
\cs_new_protected:Npn \@@_backend_getbb_pdf:n #1
{
\tl_clear:N \l_@@_decodearray_str
\bool_set_false:N \l_@@_interpolate_bool
\@@_extract_bb:n {#1}
}
%</dvipdfmx>
% \end{macrocode}
% \end{macro}
%
% \begin{variable}{\g_@@_track_int}
% Used to track the object number associated with each graphic.
% \begin{macrocode}
\int_new:N \g_@@_track_int
% \end{macrocode}
% \end{variable}
%
% \begin{macro}
% {
% \@@_backend_include_eps:n , \@@_backend_include_ps:n ,
% \@@_backend_include_jpg:n , \@@_backend_include_jpseg:n ,
% \@@_backend_include_pdf:n , \@@_backend_include_png:n ,
% \@@_backend_include_bmp:n ,
% }
% \begin{macro}{\@@_backend_include_auxi:nn}
% \begin{macro}{\@@_backend_include_auxii:nnn, \@@_backend_include_auxii:enn}
% \begin{macro}{\@@_backend_include_auxiii:nnn}
% The special syntax depends on the file type. There is a difference in
% how PDF graphics are best handled between |dvipdfmx| and \XeTeX{}: for
% the latter it is better to use the primitive route. The relevant code for
% that is included later in this file.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_include_eps:n #1
{
\__kernel_backend_literal:e
{
PSfile = #1 \c_space_tl
llx = \dim_to_decimal_in_bp:n \l_@@_llx_dim \c_space_tl
lly = \dim_to_decimal_in_bp:n \l_@@_lly_dim \c_space_tl
urx = \dim_to_decimal_in_bp:n \l_@@_urx_dim \c_space_tl
ury = \dim_to_decimal_in_bp:n \l_@@_ury_dim
}
}
\cs_new_eq:NN \@@_backend_include_ps:n \@@_backend_include_eps:n
\cs_new_protected:Npn \@@_backend_include_jpg:n #1
{ \@@_backend_include_auxi:nn {#1} { image } }
\cs_new_eq:NN \@@_backend_include_jpeg:n \@@_backend_include_jpg:n
\cs_new_eq:NN \@@_backend_include_png:n \@@_backend_include_jpg:n
\cs_new_eq:NN \@@_backend_include_bmp:n \@@_backend_include_jpg:n
%<*dvipdfmx>
\cs_new_protected:Npn \@@_backend_include_pdf:n #1
{ \@@_backend_include_auxi:nn {#1} { epdf } }
%</dvipdfmx>
% \end{macrocode}
% Graphic inclusion is set up to use the fact that each image is stored in
% the PDF as an XObject. This means that we can include repeated images
% only once and refer to them. To allow that, track the nature of each
% image: much the same as for the direct PDF mode case.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_include_auxi:nn #1#2
{
\@@_backend_include_auxii:enn
{
\tl_if_empty:NF \l_@@_pagebox_tl
{ : \l_@@_pagebox_tl }
\int_compare:nNnT \l_@@_page_int > 1
{ :P \int_use:N \l_@@_page_int }
\tl_if_empty:NF \l_@@_decodearray_str
{ :D \l_@@_decodearray_str }
\bool_if:NT \l_@@_interpolate_bool
{ :I }
}
{#1} {#2}
}
\cs_new_protected:Npn \@@_backend_include_auxii:nnn #1#2#3
{
\int_if_exist:cTF { c_@@_ #2#1 _int }
{
\__kernel_backend_literal:e
{ pdf:usexobj~@graphic \int_use:c { c_@@_ #2#1 _int } }
}
{ \@@_backend_include_auxiii:nnn {#2} {#1} {#3} }
}
\cs_generate_variant:Nn \@@_backend_include_auxii:nnn { e }
% \end{macrocode}
% Inclusion using the specials is relatively straight-forward, but there
% is one wrinkle. To get the |pagebox| correct for PDF graphics in all cases,
% it is necessary to provide both that information and the |bbox| argument:
% odd things happen otherwise!
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_include_auxiii:nnn #1#2#3
{
\int_gincr:N \g_@@_track_int
\int_const:cn { c_@@_ #1#2 _int } { \g_@@_track_int }
\__kernel_backend_literal:e
{
pdf:#3~
@graphic \int_use:c { c_@@_ #1#2 _int } ~
\int_compare:nNnT \l_@@_page_int > 1
{ page ~ \int_use:N \l_@@_page_int \c_space_tl }
\tl_if_empty:NF \l_@@_pagebox_tl
{
pagebox ~ \l_@@_pagebox_tl \c_space_tl
bbox ~
\dim_to_decimal_in_bp:n \l_@@_llx_dim \c_space_tl
\dim_to_decimal_in_bp:n \l_@@_lly_dim \c_space_tl
\dim_to_decimal_in_bp:n \l_@@_urx_dim \c_space_tl
\dim_to_decimal_in_bp:n \l_@@_ury_dim \c_space_tl
}
(#1)
\bool_lazy_or:nnT
{ \l_@@_interpolate_bool }
{ ! \tl_if_empty_p:N \l_@@_decodearray_str }
{
<<
\tl_if_empty:NF \l_@@_decodearray_str
{ /Decode~[ \l_@@_decodearray_str ] }
\bool_if:NT \l_@@_interpolate_bool
{ /Interpolate~true }
>>
}
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_backend_get_pagecount:n}
% \begin{macrocode}
%<*dvipdfmx>
\@@_backend_loaded:n
{ \cs_new_eq:NN \@@_backend_get_pagecount:n \@@_get_pagecount:n }
%</dvipdfmx>
% \end{macrocode}
% \end{macro}
%
% \begin{macrocode}
%</dvipdfmx|xetex>
% \end{macrocode}
%
% \subsection{\XeTeX{} backend}
%
% \begin{macrocode}
%<*xetex>
% \end{macrocode}
%
% \begin{macro}
% {
% \@@_backend_getbb_jpg:n ,
% \@@_backend_getbb_jpeg:n ,
% \@@_backend_getbb_pdf:n ,
% \@@_backend_getbb_png:n ,
% \@@_backend_getbb_bmp:n
% }
% \begin{macro}{\@@_backend_getbb_auxi:nN}
% \begin{macro}{\@@_backend_getbb_auxii:nnN, \@@_backend_getbb_auxii:VnN}
% \begin{macro}{\@@_backend_getbb_auxiii:nNnn}
% \begin{macro}{\@@_backend_getbb_auxiv:nnNnn, \@@_backend_getbb_auxiv:VnNnn}
% \begin{macro}{\@@_backend_getbb_auxv:nNnn, \@@_backend_getbb_auxv:nNnn}
% \begin{macro}[EXP]{\@@_backend_getbb_pagebox:w}
% For \XeTeX{}, there are two primitives that allow us to obtain
% the bounding box without needing \texttt{extractbb}. The only complexity
% is passing the various minor variations to a common core process. The
% \XeTeX{} primitive omits the text |box| from the page box specification,
% so there is also some \enquote{trimming} to do here.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_getbb_jpg:n #1
{
\int_zero:N \l_@@_page_int
\tl_clear:N \l_@@_pagebox_tl
\@@_backend_getbb_auxi:nN {#1} \tex_XeTeXpicfile:D
}
\cs_new_eq:NN \@@_backend_getbb_jpeg:n \@@_backend_getbb_jpg:n
\cs_new_eq:NN \@@_backend_getbb_png:n \@@_backend_getbb_jpg:n
\cs_new_eq:NN \@@_backend_getbb_bmp:n \@@_backend_getbb_jpg:n
\cs_new_protected:Npn \@@_backend_getbb_pdf:n #1
{
\tl_clear:N \l_@@_decodearray_str
\bool_set_false:N \l_@@_interpolate_bool
\@@_backend_getbb_auxi:nN {#1} \tex_XeTeXpdffile:D
}
\cs_new_protected:Npn \@@_backend_getbb_auxi:nN #1#2
{
\int_compare:nNnTF \l_@@_page_int > 1
{ \@@_backend_getbb_auxii:VnN \l_@@_page_int {#1} #2 }
{ \@@_backend_getbb_auxiii:nNnn {#1} #2 { :P 1 } { page 1 } }
}
\cs_new_protected:Npn \@@_backend_getbb_auxii:nnN #1#2#3
{ \@@_backend_getbb_auxiii:nNnn {#2} #3 { :P #1 } { page #1 } }
\cs_generate_variant:Nn \@@_backend_getbb_auxii:nnN { V }
\cs_new_protected:Npn \@@_backend_getbb_auxiii:nNnn #1#2#3#4
{
\tl_if_empty:NTF \l_@@_pagebox_tl
{ \@@_backend_getbb_auxiv:VnNnn \l_@@_pagebox_tl }
{ \@@_backend_getbb_auxv:nNnn }
{#1} #2 {#3} {#4}
}
\cs_new_protected:Npn \@@_backend_getbb_auxiv:nnNnn #1#2#3#4#5
{
\use:e
{
\@@_backend_getbb_auxv:nNnn {#2} #3 { : #1 #4 }
{
#5
\tl_if_blank:nF {#1}
{ \c_space_tl \@@_backend_getbb_pagebox:w #1 }
}
}
}
\cs_generate_variant:Nn \@@_backend_getbb_auxiv:nnNnn { V }
\cs_new_protected:Npn \@@_backend_getbb_auxv:nNnn #1#2#3#4
{
\@@_bb_restore:nF {#1#3}
{ \@@_backend_getbb_auxvi:nNnn {#1} #2 {#3} {#4} }
}
\cs_new_protected:Npn \@@_backend_getbb_auxvi:nNnn #1#2#3#4
{
\hbox_set:Nn \l_@@_internal_box { #2 #1 ~ #4 }
\dim_set:Nn \l_@@_urx_dim { \box_wd:N \l_@@_internal_box }
\dim_set:Nn \l_@@_ury_dim { \box_ht:N \l_@@_internal_box }
\@@_bb_save:n {#1#3}
}
\cs_new:Npn \@@_backend_getbb_pagebox:w #1 box {#1}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_backend_include_pdf:n}
% For PDF graphics, properly supporting the |pagebox| concept in \XeTeX{}
% is best done using the |\tex_XeTeXpdffile:D| primitive. The syntax here
% is the same as for the graphic measurement part, although we know at this
% stage that there must be some valid setting for \cs{l_@@_pagebox_tl}.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_include_pdf:n #1
{
\tex_XeTeXpdffile:D #1 ~
\int_compare:nNnT \l_@@_page_int > 0
{ page ~ \int_use:N \l_@@_page_int \c_space_tl }
\exp_after:wN \@@_backend_getbb_pagebox:w \l_@@_pagebox_tl
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_backend_get_pagecount:n}
% Very little to do here other than cover the case of a non-PDF file.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_get_pagecount:n #1
{
\int_const:cn { c_@@_ #1 _pages_int }
{
\int_max:nn
{ \int_use:N \tex_XeTeXpdfpagecount:D #1 ~ }
{ 1 }
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macrocode}
%</xetex>
% \end{macrocode}
%
% \subsection{\texttt{dvisvgm} backend}
%
% \begin{macrocode}
%<*dvisvgm>
% \end{macrocode}
%
% \begin{variable}[no-user-doc]{\l_graphics_search_ext_seq}
% \begin{macrocode}
\@@_backend_loaded:n
{
\seq_set_from_clist:Nn
\l_graphics_search_ext_seq
{ .svg , .pdf , .eps , .ps , .png , .jpg , .jpeg }
}
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\@@_backend_getbb_svg:n}
% \begin{macro}{\@@_backend_getbb_svg_auxi:nNn}
% \begin{macro}{\@@_backend_getbb_svg_auxii:w}
% \begin{macro}
% {
% \@@_backend_getbb_svg_auxiii:Nw ,
% \@@_backend_getbb_svg_auxiv:Nw ,
% \@@_backend_getbb_svg_auxv:Nw
% }
% \begin{macro}{\@@_backend_getbb_svg_auxvi:Nn}
% \begin{macro}{\@@_backend_getbb_svg_auxvii:w}
% This is relatively similar to reading bounding boxes for |.eps| files. Life
% is though made more tricky as we cannot pick a single line for the data. So
% we have to loop until we collect up both height and width. To do that, we
% can use a marker value. We also have to allow for the default units of the
% lengths: they are big points and may be omitted.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_getbb_svg:n #1
{
\@@_bb_restore:nF {#1}
{
\ior_open:Nn \l_@@_internal_ior {#1}
\ior_if_eof:NTF \l_@@_internal_ior
{ \msg_error:nnn { graphics } { graphic-not-found } {#1} }
{
\dim_zero:N \l_@@_llx_dim
\dim_zero:N \l_@@_lly_dim
\dim_set:Nn \l_@@_urx_dim { -\c_max_dim }
\dim_set:Nn \l_@@_ury_dim { -\c_max_dim }
\ior_str_map_inline:Nn \l_@@_internal_ior
{
\dim_compare:nNnT \l_@@_urx_dim = { -\c_max_dim }
{
\@@_backend_getbb_svg_auxi:nNn
{ width } \l_@@_urx_dim {##1}
}
\dim_compare:nNnT \l_@@_ury_dim = { -\c_max_dim }
{
\@@_backend_getbb_svg_auxi:nNn
{ height } \l_@@_ury_dim {##1}
}
\bool_lazy_and:nnF
{ \dim_compare_p:nNn \l_@@_urx_dim = { -\c_max_dim } }
{ \dim_compare_p:nNn \l_@@_ury_dim = { -\c_max_dim } }
{ \ior_map_break: }
}
\@@_bb_save:n {#1}
}
\ior_close:N \l_@@_internal_ior
}
}
\cs_new_protected:Npn \@@_backend_getbb_svg_auxi:nNn #1#2#3
{
\use:e
{
\cs_set_protected:Npn \@@_backend_getbb_svg_auxii:w
##1 \tl_to_str:n {#1} = ##2 \tl_to_str:n {#1} = ##3
\s_@@_stop
}
{
\tl_if_blank:nF {##2}
{
\peek_remove_spaces:n
{
\peek_meaning:NTF ' % '
{ \@@_backend_getbb_svg_auxiii:Nw #2 }
{
\peek_meaning:NTF " % "
{ \@@_backend_getbb_svg_auxiv:Nw #2 }
{ \@@_backend_getbb_svg_auxv:Nw #2 }
}
}
##2 \s_@@_stop
}
}
\use:e
{
\@@_backend_getbb_svg_auxii:w #3
\tl_to_str:n {#1} = \tl_to_str:n {#1} =
\s_@@_stop
}
}
\cs_new_protected:Npn \@@_backend_getbb_svg_auxii:w { }
\cs_new_protected:Npn \@@_backend_getbb_svg_auxiii:Nw #1 ' #2 ' #3 \s_@@_stop
{ \@@_backend_getbb_svg_auxvi:Nn #1 {#2} }
\cs_new_protected:Npn \@@_backend_getbb_svg_auxiv:Nw #1 " #2 " #3 \s_@@_stop
{ \@@_backend_getbb_svg_auxvi:Nn #1 {#2} }
\cs_new_protected:Npn \@@_backend_getbb_svg_auxv:Nw #1 #2 ~ #3 \s_@@_stop
{ \@@_backend_getbb_svg_auxvi:Nn #1 {#2} }
\cs_new_protected:Npn \@@_backend_getbb_svg_auxvi:Nn #1#2
{
\tex_afterassignment:D \@@_backend_getbb_svg_auxvii:w
\l_@@_internal_dim #2 bp \scan_stop:
\dim_set_eq:NN #1 \l_@@_internal_dim
}
\cs_new_protected:Npn \@@_backend_getbb_svg_auxvii:w #1 \scan_stop: { }
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_backend_getbb_eps:n, \@@_backend_getbb_ps:n}
% Simply use the generic function.
% \begin{macrocode}
\@@_backend_loaded:n
{
\cs_new_eq:NN \@@_backend_getbb_eps:n \@@_read_bb:n
\cs_new_eq:NN \@@_backend_getbb_ps:n \@@_read_bb:n
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_backend_getbb_png:n, \@@_backend_getbb_jpg:n, \@@_backend_getbb_jpeg:n}
% These can be included by extracting the bounding box data.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_getbb_jpg:n #1
{
\int_zero:N \l_@@_page_int
\tl_clear:N \l_@@_pagebox_tl
\@@_extract_bb:n {#1}
}
\cs_new_eq:NN \@@_backend_getbb_jpeg:n \@@_backend_getbb_jpg:n
\cs_new_eq:NN \@@_backend_getbb_png:n \@@_backend_getbb_jpg:n
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_backend_getbb_pdf:n}
% Same as for \texttt{dvipdfmx}: use the generic function
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_getbb_pdf:n #1
{
\tl_clear:N \l_@@_decodearray_str
\bool_set_false:N \l_@@_interpolate_bool
\@@_extract_bb:n {#1}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}
% {
% \@@_backend_include_eps:n ,
% \@@_backend_include_ps:n ,
% \@@_backend_include_pdf:n
% }
% \begin{macro}{\@@_backend_include:nn}
% The special syntax is relatively clear here: remember we need PostScript
% sizes here. (This is the same as the \texttt{dvips} code.)
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_include_eps:n #1
{ \@@_backend_include:nn { PSfile } {#1} }
\cs_new_eq:NN \@@_backend_include_ps:n \@@_backend_include_eps:n
\cs_new_protected:Npn \@@_backend_include_pdf:n #1
{ \@@_backend_include:nn { pdffile } {#1} }
\cs_new_protected:Npn \@@_backend_include:nn #1#2
{
\__kernel_backend_literal:e
{
#1 = #2 \c_space_tl
llx = \dim_to_decimal_in_bp:n \l_@@_llx_dim \c_space_tl
lly = \dim_to_decimal_in_bp:n \l_@@_lly_dim \c_space_tl
urx = \dim_to_decimal_in_bp:n \l_@@_urx_dim \c_space_tl
ury = \dim_to_decimal_in_bp:n \l_@@_ury_dim
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}
% {
% \@@_backend_include_svg:n ,
% \@@_backend_include_png:n ,
% \@@_backend_include_jpg:n ,
% \@@_backend_include_jpeg:n
% }
% \begin{macro}{\@@_backend_include_dequote:w}
% The backend here has built-in support for basic graphic inclusion (see
% \texttt{dvisvgm.def} for a more complex approach, needed if clipping,
% \emph{etc.}, is covered at the graphic backend level). We have to deal
% with the fact that the image reference point is at the \emph{top}, so
% there is a need for a vertical shift to put it in the right place.
% The other issue is that |#1| must be quote-corrected. The
% \texttt{dvisvgm:img} operation quotes the file name, but if it is already
% quoted (contains spaces) then we have an issue: we simply strip off any
% quotes as a result.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_include_svg:n #1
{
\box_move_up:nn { \l_@@_ury_dim }
{
\hbox:n
{
\__kernel_backend_literal:e
{
dvisvgm:img~
\dim_to_decimal:n { \l_@@_urx_dim } ~
\dim_to_decimal:n { \l_@@_ury_dim } ~
\@@_backend_include_dequote:w #1 " #1 " \s_@@_stop
}
}
}
}
\cs_new_eq:NN \@@_backend_include_png:n \@@_backend_include_svg:n
\cs_new_eq:NN \@@_backend_include_jpeg:n \@@_backend_include_svg:n
\cs_new_eq:NN \@@_backend_include_jpg:n \@@_backend_include_svg:n
\cs_new:Npn \@@_backend_include_dequote:w #1 " #2 " #3 \s_@@_stop
{#2}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_backend_get_pagecount:n}
% \begin{macrocode}
\@@_backend_loaded:n
{ \cs_new_eq:NN \@@_backend_get_pagecount:n \@@_get_pagecount:n }
% \end{macrocode}
% \end{macro}
%
% \begin{macrocode}
%</dvisvgm>
% \end{macrocode}
%
% \begin{macrocode}
%</package>
% \end{macrocode}
%
% \end{implementation}
%
% \PrintIndex