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l3backend-pdf.dtx
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l3backend-pdf.dtx
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% \iffalse meta-comment
%
%% File: l3backend-pdf.dtx
%
% Copyright (C) 2019-2021 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 \textsf{l3backend-pdf} package\\ Backend PDF features^^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 2021-02-06}
%
% \maketitle
%
% \begin{documentation}
%
% \end{documentation}
%
% \begin{implementation}
%
% \section{\pkg{l3backend-pdf} Implementation}
%
% \begin{macrocode}
%<*package>
%<@@=pdf>
% \end{macrocode}
%
% Setting up PDF resources is a complex area with only limited documentation
% in the engine manuals. The following code builds heavily on existing ideas
% from \pkg{hyperref} work by Sebastian Rahtz and Heiko Oberdiek, and
% significant contributions by Alexander Grahn, in addition to the specific
% code referenced a various points.
%
% \subsection{Shared code}
%
% A very small number of items that belong at the backend level but which
% are common to all backends.
%
% \begin{variable}{\l_@@_internal_box}
% \begin{macrocode}
\box_new:N \l_@@_internal_box
% \end{macrocode}
% \end{variable}
%
% \subsection{\texttt{dvips} backend}
%
% \begin{macrocode}
%<*dvips>
% \end{macrocode}
%
% \begin{macro}{\@@_backend_pdfmark:n, \@@_backend_pdfmark:x}
% Used often enough it should be a separate function.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_pdfmark:n #1
{ \__kernel_backend_postscript:n { mark #1 ~ pdfmark } }
\cs_generate_variant:Nn \@@_backend_pdfmark:n { x }
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Catalogue entries}
%
% \begin{macro}{\@@_backend_catalog_gput:nn, \@@_backend_info_gput:nn}
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_catalog_gput:nn #1#2
{ \@@_backend_pdfmark:n { { Catalog } << /#1 ~ #2 >> /PUT } }
\cs_new_protected:Npn \@@_backend_info_gput:nn #1#2
{ \@@_backend_pdfmark:n { /#1 ~ #2 /DOCINFO } }
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Objects}
%
% \begin{variable}{\g_@@_backend_object_int, \g_@@_backend_object_prop}
% For tracking objects to allow finalisation.
% \begin{macrocode}
\int_new:N \g_@@_backend_object_int
\prop_new:N \g_@@_backend_object_prop
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\@@_backend_object_new:nn}
% \begin{macro}[EXP]{\@@_backend_object_ref:n}
% Tracking objects is similar to \texttt{dvipdfmx}.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_object_new:nn #1#2
{
\int_gincr:N \g_@@_backend_object_int
\int_const:cn
{ c_@@_backend_object_ \tl_to_str:n {#1} _int }
{ \g_@@_backend_object_int }
\prop_gput:Nnn \g_@@_backend_object_prop {#1} {#2}
}
\cs_new:Npn \@@_backend_object_ref:n #1
{ { pdf.obj \int_use:c { c_@@_backend_object_ \tl_to_str:n {#1} _int } } }
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_backend_object_write:nn, \@@_backend_object_write:nx}
% \begin{macro}
% {
% \@@_backend_object_write_array:nn ,
% \@@_backend_object_write_dict:nn ,
% \@@_backend_object_write_fstream:nn ,
% \@@_backend_object_write_stream:nn
% }
% \begin{macro}{\@@_backend_object_write_stream:nnn}
% This is where we choose the actual type: some work to get things
% right.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_object_write:nn #1#2
{
\@@_backend_pdfmark:x
{
/_objdef ~ \@@_backend_object_ref:n {#1}
/type
\str_case_e:nn
{ \prop_item:Nn \g_@@_backend_object_prop {#1} }
{
{ array } { /array }
{ dict } { /dict }
{ fstream } { /stream }
{ stream } { /stream }
}
/OBJ
}
\use:c
{ @@_backend_object_write_ \prop_item:Nn \g_@@_backend_object_prop {#1} :nn }
{ \@@_backend_object_ref:n {#1} } {#2}
}
\cs_generate_variant:Nn \@@_backend_object_write:nn { nx }
\cs_new_protected:Npn \@@_backend_object_write_array:nn #1#2
{
\@@_backend_pdfmark:x
{ #1 ~0~ [ ~ \exp_not:n {#2} ~ ] ~ /PUTINTERVAL }
}
\cs_new_protected:Npn \@@_backend_object_write_dict:nn #1#2
{
\@@_backend_pdfmark:x
{ #1 << \exp_not:n {#2} >> /PUT }
}
\cs_new_protected:Npn \@@_backend_object_write_fstream:nn #1#2
{
\exp_args:Nx
\@@_backend_object_write_fstream:nnn {#1} #2
}
\cs_new_protected:Npn \@@_backend_object_write_fstream:nnn #1#2#3
{
\__kernel_backend_postscript:n
{
SDict ~ begin ~
mark ~ #1 ~ << #2 >> /PUT ~ pdfmark ~
mark ~ #1 ~ ( #3 )~ ( r )~ file ~ /PUT ~ pdfmark ~
end
}
}
\cs_new_protected:Npn \@@_backend_object_write_stream:nn #1#2
{
\exp_args:Nx
\@@_backend_object_write_stream:nnn {#1} #2
}
\cs_new_protected:Npn \@@_backend_object_write_stream:nnn #1#2#3
{
\__kernel_backend_postscript:n
{
mark ~ #1 ~ ( #3 ) /PUT ~ pdfmark ~
mark ~ #1 ~ << #2 >> /PUT ~ pdfmark
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_backend_object_now:nn, \@@_backend_object_now:nx}
% No anonymous objects, so things are done manually.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_object_now:nn #1#2
{
\int_gincr:N \g_@@_backend_object_int
\@@_backend_pdfmark:x
{
/_objdef ~ { pdf.obj \int_use:N \g_@@_backend_object_int }
/type
\str_case:nn
{#1}
{
{ array } { /array }
{ dict } { /dict }
{ fstream } { /stream }
{ stream } { /stream }
}
/OBJ
}
\exp_args:Nnx \use:c { @@_backend_object_write_ #1 :nn }
{ { pdf.obj \int_use:N \g_@@_backend_object_int } } {#2}
}
\cs_generate_variant:Nn \@@_backend_object_now:nn { nx }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[EXP]{\@@_backend_object_last:}
% Much like the annotation version.
% \begin{macrocode}
\cs_new:Npn \@@_backend_object_last:
{ { pdf.obj \int_use:N \g_@@_backend_object_int } }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[EXP]{\@@_backend_pageobject_ref:n}
% Page references are easy in \texttt{dvips}.
% \begin{macrocode}
\cs_new:Npn \@@_backend_pageobject_ref:n #1
{ { Page #1 } }
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Annotations}
%
% In \texttt{dvips}, annotations have to be constructed manually. As such,
% we need the object code above for some definitions.
%
% \begin{variable}{\l_@@_backend_content_box}
% The content of an annotation.
% \begin{macrocode}
\box_new:N \l_@@_backend_content_box
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_backend_model_box}
% For creating model sizing for links.
% \begin{macrocode}
\box_new:N \l_@@_backend_model_box
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_backend_annotation_int}
% Needed as objects which are not annotations could be created.
% \begin{macrocode}
\int_new:N \g_@@_backend_annotation_int
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\@@_backend_annotation:nnnn}
% Annotations are objects, but we track them separately. Notably, they are
% not in the object data lists. Here, to get the co-ordinates of the
% annotation, we need to have the data collected at the PostScript level.
% That requires a bit of box trickery (effectively a \LaTeXe{} |picture|
% of zero size). Once the data is collected, use it to set up the annotation
% border.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_annotation:nnnn #1#2#3#4
{
\exp_args:Nf \@@_backend_annotation_aux:nnnn
{ \dim_eval:n {#1} } {#2} {#3} {#4}
}
\cs_new_protected:Npn \@@_backend_annotation_aux:nnnn #1#2#3#4
{
\box_move_down:nn {#3}
{ \hbox:n { \__kernel_backend_postscript:n { pdf.save.ll } } }
\box_move_up:nn {#2}
{
\hbox:n
{
\__kernel_kern:n {#1}
\__kernel_backend_postscript:n { pdf.save.ur }
\__kernel_kern:n { -#1 }
}
}
\int_gincr:N \g_@@_backend_object_int
\int_gset_eq:NN \g_@@_backend_annotation_int \g_@@_backend_object_int
\@@_backend_pdfmark:x
{
/_objdef { pdf.obj \int_use:N \g_@@_backend_object_int }
pdf.rect
#4 ~
/ANN
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[EXP]{\@@_backend_annotation_last:}
% Provide the last annotation we created: could get tricky of course if
% other packages are loaded.
% \begin{macrocode}
\cs_new:Npn \@@_backend_annotation_last:
{ { pdf.obj \int_use:N \g_@@_backend_annotation_int } }
% \end{macrocode}
% \end{macro}
%
% \begin{variable}{\g_@@_backend_link_int}
% To track annotations which are links.
% \begin{macrocode}
\int_new:N \g_@@_backend_link_int
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_backend_link_dict_tl}
% To pass information to the end-of-link function.
% \begin{macrocode}
\tl_new:N \g_@@_backend_link_dict_tl
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_backend_link_sf_int}
% Needed to save/restore space factor, which is needed to deal with the face
% we need a box.
% \begin{macrocode}
\int_new:N \g_@@_backend_link_sf_int
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_backend_link_math_bool}
% Needed to save/restore math mode.
% \begin{macrocode}
\bool_new:N \g_@@_backend_link_math_bool
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\g_@@_backend_link_bool}
% Track link formation: we cannot nest at all.
% \begin{macrocode}
\bool_new:N \g_@@_backend_link_bool
% \end{macrocode}
% \end{variable}
%
% \begin{variable}{\l_@@_breaklink_pdfmark_tl}
% Swappable content for link breaking.
% \begin{macrocode}
\tl_new:N \l_@@_breaklink_pdfmark_tl
\tl_set:Nn \l_@@_breaklink_pdfmark_tl { pdfmark }
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\@@_breaklink_postscript:n}
% To allow dropping material unless link breaking is active.
% \begin{macrocode}
\cs_new_protected:Npn \@@_breaklink_postscript:n #1 { }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_breaklink_usebox:N}
% Swappable box unpacking or use.
% \begin{macrocode}
\cs_new_eq:NN \@@_breaklink_usebox:N \box_use:N
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_backend_link_begin_goto:nnw, \@@_backend_link_begin_user:nnw}
% \begin{macro}{\@@_backend_link:nw, \@@_backend_link_aux:nw}
% \begin{macro}{\@@_backend_link_end:, \@@_backend_link_end_aux:}
% \begin{macro}{\@@_backend_link_minima:}
% \begin{macro}{\@@_backend_link_outerbox:n}
% \begin{macro}{\@@_backend_link_sf_save:, \@@_backend_link_sf_restore:}
% \begin{macro}
% {
% pdf.linkdp.pad ,
% pdf.linkht.pad ,
% pdf.llx, pdf.lly ,
% pdf.ury, pdf.ury ,
% pdf.link.dict ,
% pdf.outerbox ,
% pdf.baselineskip
% }
% Links are crated like annotations but with dedicated code to allow for
% adjusting the size of the rectangle. In contrast to \pkg{hyperref}, we
% grab the link content as a box which can then unbox: this allows the same
% interface as for \pdfTeX{}.
%
% Taking the idea of |evenboxes| from \pkg{hypdvips}, we implement a minimum
% box height and depth for link placement. This means that \enquote{underlining}
% with a hyperlink will generally give an even appearance. However, to ensure
% that the full content is always above the link border, we do not allow
% this to be negative (contrast \pkg{hypdvips} approach). The result should
% be similar to \pdfTeX{} in the vast majority of foreseeable cases.
%
% The object number for a link is saved separately from the rest of the
% dictionary as this allows us to insert it just once, at either an
% unbroken link or only in the first line of a broken one. That makes the
% code clearer but also avoids a low-level PostScript error with the code
% as taken from \pkg{hypdvips}.
%
% Getting the outer dimensions of the text area may be better using a two-pass
% approach and |\tex_savepos:D|. That plus format mode are still to re-examine.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_link_begin_goto:nnw #1#2
{ \@@_backend_link_begin:nw { #1 /Subtype /Link /A << /S /GoTo /D ( #2 ) >> } }
\cs_new_protected:Npn \@@_backend_link_begin_user:nnw #1#2
{ \@@_backend_link_begin:nw {#1#2} }
\cs_new_protected:Npn \@@_backend_link_begin:nw #1
{
\bool_if:NF \g_@@_backend_link_bool
{ \@@_backend_link_begin_aux:nw {#1} }
}
\cs_new_protected:Npn \@@_backend_link_begin_aux:nw #1
{
\bool_gset_true:N \g_@@_backend_link_bool
\__kernel_backend_postscript:n
{ /pdf.link.dict ( #1 ) def }
\tl_gset:Nn \g_@@_backend_link_dict_tl {#1}
\@@_backend_link_sf_save:
\mode_if_math:TF
{ \bool_gset_true:N \g_@@_backend_link_math_bool }
{ \bool_gset_false:N \g_@@_backend_link_math_bool }
\hbox_set:Nw \l_@@_backend_content_box
\@@_backend_link_sf_restore:
\bool_if:NT \g_@@_backend_link_math_bool
{ \c_math_toggle_token }
}
\cs_new_protected:Npn \@@_backend_link_end:
{
\bool_if:NT \g_@@_backend_link_bool
{ \@@_backend_link_end_aux: }
}
\cs_new_protected:Npn \@@_backend_link_end_aux:
{
\bool_if:NT \g_@@_backend_link_math_bool
{ \c_math_toggle_token }
\@@_backend_link_sf_save:
\hbox_set_end:
\@@_backend_link_minima:
\hbox_set:Nn \l_@@_backend_model_box { Gg }
\exp_args:Nx \@@_backend_link_outerbox:n
{
\int_if_odd:nTF { \value { page } }
{ \oddsidemargin }
{ \evensidemargin }
}
\box_move_down:nn { \box_dp:N \l_@@_backend_content_box }
{ \hbox:n { \__kernel_backend_postscript:n { pdf.save.linkll } } }
\@@_breaklink_postscript:n { pdf.bordertracking.begin }
\@@_breaklink_usebox:N \l_@@_backend_content_box
\@@_breaklink_postscript:n { pdf.bordertracking.end }
\box_move_up:nn { \box_ht:N \l_@@_backend_content_box }
{
\hbox:n
{ \__kernel_backend_postscript:n { pdf.save.linkur } }
}
\int_gincr:N \g_@@_backend_object_int
\int_gset_eq:NN \g_@@_backend_link_int \g_@@_backend_object_int
\__kernel_backend_postscript:x
{
mark
/_objdef { pdf.obj \int_use:N \g_@@_backend_link_int }
\g_@@_backend_link_dict_tl \c_space_tl
pdf.rect
/ANN ~ \l_@@_breaklink_pdfmark_tl
}
\@@_backend_link_sf_restore:
\bool_gset_false:N \g_@@_backend_link_bool
}
\cs_new_protected:Npn \@@_backend_link_minima:
{
\hbox_set:Nn \l_@@_backend_model_box { Gg }
\__kernel_backend_postscript:x
{
/pdf.linkdp.pad ~
\dim_to_decimal:n
{
\dim_max:nn
{
\box_dp:N \l_@@_backend_model_box
- \box_dp:N \l_@@_backend_content_box
}
{ 0pt }
} ~
pdf.pt.dvi ~ def
/pdf.linkht.pad ~
\dim_to_decimal:n
{
\dim_max:nn
{
\box_ht:N \l_@@_backend_model_box
- \box_ht:N \l_@@_backend_content_box
}
{ 0pt }
} ~
pdf.pt.dvi ~ def
}
}
\cs_new_protected:Npn \@@_backend_link_outerbox:n #1
{
\__kernel_backend_postscript:x
{
/pdf.outerbox
[
\dim_to_decimal:n {#1} ~
\dim_to_decimal:n { -\box_dp:N \l_@@_backend_model_box } ~
\dim_to_decimal:n { #1 + \textwidth } ~
\dim_to_decimal:n { \box_ht:N \l_@@_backend_model_box }
]
[ exch { pdf.pt.dvi } forall ] def
/pdf.baselineskip ~
\dim_to_decimal:n { \tex_baselineskip:D } ~ dup ~ 0 ~ gt
{ pdf.pt.dvi ~ def }
{ pop ~ pop }
ifelse
}
}
\cs_new_protected:Npn \@@_backend_link_sf_save:
{
\int_gset:Nn \g_@@_backend_link_sf_int
{
\mode_if_horizontal:TF
{ \tex_spacefactor:D }
{ 0 }
}
}
\cs_new_protected:Npn \@@_backend_link_sf_restore:
{
\mode_if_horizontal:T
{
\int_compare:nNnT \g_@@_backend_link_sf_int > { 0 }
{ \int_set_eq:NN \tex_spacefactor:D \g_@@_backend_link_sf_int }
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@makecol@hook}
% Hooks to allow link breaking: something will be needed in format mode
% at some stage. At present this code is disabled as there is an open
% question about the name of the hook: to be resolved at the \LaTeXe{}
% end.
% \begin{macrocode}
\use_none:n
{
\cs_if_exist:NT \@makecol@hook
{
\tl_put_right:Nn \@makecol@hook
{
\box_if_empty:NF \@cclv
{
\vbox_set:Nn \@cclv
{
\__kernel_backend_postscript:n
{
pdf.globaldict /pdf.brokenlink.rect ~ known
{ pdf.bordertracking.continue }
if
}
\vbox_unpack_drop:N \@cclv
\__kernel_backend_postscript:n
{ pdf.bordertracking.endpage }
}
}
}
\tl_set:Nn \l_@@_breaklink_pdfmark_tl { pdf.pdfmark }
\cs_set_eq:NN \@@_breaklink_postscript:n \__kernel_backend_postscript:n
\cs_set_eq:NN \@@_breaklink_usebox:N \hbox_unpack:N
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_backend_link_last:}
% The same as annotations, but with a custom integer.
% \begin{macrocode}
\cs_new:Npn \@@_backend_link_last:
{ { pdf.obj \int_use:N \g_@@_backend_link_int } }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_backend_link_margin:n}
% Convert to big points and pass to PostScript.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_link_margin:n #1
{
\__kernel_backend_postscript:x
{
/pdf.linkmargin { \dim_to_decimal:n {#1} ~ pdf.pt.dvi } def
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_backend_destination:nn}
% \begin{macro}{\@@_backend_destination:nnnn, \@@_backend_destination_aux:nnnn}
% Here, we need to turn the zoom into a scale. We also need to know where
% the current anchor point actually is: worked out in PostScript. For the
% rectangle version, we have a bit more PostScript: we need two points.
% fitr without rule spec doesn't work, so it falls back to \texttt{/Fit} here.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_destination:nn #1#2
{
\__kernel_backend_postscript:n { pdf.dest.anchor }
\@@_backend_pdfmark:x
{
/View
[
\str_case:nnF {#2}
{
{ xyz } { /XYZ ~ pdf.dest.point ~ null }
{ fit } { /Fit }
{ fitb } { /FitB }
{ fitbh } { /FitBH ~ pdf.dest.y }
{ fitbv } { /FitBV ~ pdf.dest.x }
{ fith } { /FitH ~ pdf.dest.y }
{ fitv } { /FitV ~ pdf.dest.x }
{ fitr } { /Fit }
}
{
/XYZ ~ pdf.dest.point ~ \fp_eval:n { (#2) / 100 }
}
]
/Dest ( \exp_not:n {#1} ) cvn
/DEST
}
}
\cs_new_protected:Npn \@@_backend_destination:nnnn #1#2#3#4
{
\exp_args:Ne \@@_backend_destination_aux:nnnn
{ \dim_eval:n {#2} } {#1} {#3} {#4}
}
\cs_new_protected:Npn \@@_backend_destination_aux:nnnn #1#2#3#4
{
\vbox_to_zero:n
{
\__kernel_kern:n {#4}
\hbox:n { \__kernel_backend_postscript:n { pdf.save.ll } }
\tex_vss:D
}
\__kernel_kern:n {#1}
\vbox_to_zero:n
{
\__kernel_kern:n { -#3 }
\hbox:n { \__kernel_backend_postscript:n { pdf.save.ur } }
\tex_vss:D
}
\__kernel_kern:n { -#1 }
\@@_backend_pdfmark:n
{
/View
[
/FitR ~
pdf.llx ~ pdf.lly ~ pdf.dest2device ~
pdf.urx ~ pdf.ury ~ pdf.dest2device
]
/Dest ( #2 ) cvn
/DEST
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsubsection{Structure}
%
% \begin{macro}{\@@_backend_compresslevel:n}
% \begin{macro}{\@@_backend_compress_objects:n}
% Doable for the usual \texttt{ps2pdf} method.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_compresslevel:n #1
{
\int_compare:nNnT {#1} = 0
{
\__kernel_backend_literal_postscript:n
{
/setdistillerparams ~ where
{ pop << /CompressPages ~ false >> setdistillerparams }
if
}
}
}
\cs_new_protected:Npn \@@_backend_compress_objects:n #1
{
\bool_if:nF {#1}
{
\__kernel_backend_literal_postscript:n
{
/setdistillerparams ~ where
{ pop << /CompressStreams ~ false >> setdistillerparams }
if
}
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}
% {\@@_backend_version_major_gset:n, \@@_backend_version_minor_gset:n}
% Data not available!
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_version_major_gset:n #1 { }
\cs_new_protected:Npn \@@_backend_version_minor_gset:n #1 { }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[EXP]{\@@_backend_version_major:, \@@_backend_version_minor:}
% Data not available!
% \begin{macrocode}
\cs_new:Npn \@@_backend_version_major: { -1 }
\cs_new:Npn \@@_backend_version_minor: { -1 }
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Marked content}
%
% \begin{macro}{\@@_backend_bdc:nn}
% \begin{macro}{\@@_backend_emc:}
% Simple wrappers.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_bdc:nn #1#2
{ \@@_backend_pdfmark:n { /#1 ~ #2 /BDC } }
\cs_new_protected:Npn \@@_backend_emc:
{ \@@_backend_pdfmark:n { /EMC } }
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macrocode}
%</dvips>
% \end{macrocode}
%
% \subsection{\LuaTeX{} and \pdfTeX{} backend}
%
% \begin{macrocode}
%<*luatex|pdftex>
% \end{macrocode}
%
% \subsubsection{Annotations}
%
% \begin{macro}{\@@_backend_annotation:nnnn}
% Simply pass the raw data through, just dealing with evaluation of dimensions.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_annotation:nnnn #1#2#3#4
{
%<*luatex>
\tex_pdfextension:D annot ~
%</luatex>
%<*pdftex>
\tex_pdfannot:D
%</pdftex>
width ~ \dim_eval:n {#1} ~
height ~ \dim_eval:n {#2} ~
depth ~ \dim_eval:n {#3} ~
{#4}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[EXP]{\@@_backend_annotation_last:}
% A tiny amount of extra data gets added here; we use \texttt{x}-type
% expansion to get the space in the right place and form. The \enquote{extra}
% space in the \LuaTeX{} version is \emph{required} as it is consumed in
% finding the end of the keyword.
% \begin{macrocode}
\cs_new:Npx \@@_backend_annotation_last:
{
\exp_not:N \int_value:w
%<*luatex>
\exp_not:N \tex_pdffeedback:D lastannot ~
%</luatex>
%<*pdftex>
\exp_not:N \tex_pdflastannot:D
%</pdftex>
\c_space_tl 0 ~ R
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}
% {\@@_backend_link_begin_goto:nnw, \@@_backend_link_begin_user:nnw}
% \begin{macro}{\@@_backend_link_begin:nnnw}
% \begin{macro}{\@@_backend_link_end:}
% Links are all created using the same internals.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_link_begin_goto:nnw #1#2
{ \@@_backend_link_begin:nnnw {#1} { goto~name } {#2} }
\cs_new_protected:Npn \@@_backend_link_begin_user:nnw #1#2
{ \@@_backend_link_begin:nnnw {#1} { user } {#2} }
\cs_new_protected:Npn \@@_backend_link_begin:nnnw #1#2#3
{
%<*luatex>
\tex_pdfextension:D startlink ~
%</luatex>
%<*pdftex>
\tex_pdfstartlink:D
%</pdftex>
attr {#1}
#2 {#3}
}
\cs_new_protected:Npn \@@_backend_link_end:
{
%<*luatex>
\tex_pdfextension:D endlink \scan_stop:
%</luatex>
%<*pdftex>
\tex_pdfendlink:D
%</pdftex>
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_backend_link_last:}
% Formatted for direct use.
% \begin{macrocode}
\cs_new:Npx \@@_backend_link_last:
{
\exp_not:N \int_value:w
%<*luatex>
\exp_not:N \tex_pdffeedback:D lastlink ~
%</luatex>
%<*pdftex>
\exp_not:N \tex_pdflastlink:D
%</pdftex>
\c_space_tl 0 ~ R
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_backend_link_margin:n}
% A simple task: pass the data to the primitive.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_link_margin:n #1
{
%<*luatex>
\tex_pdfvariable:D linkmargin
%</luatex>
%<*pdftex>
\tex_pdflinkmargin:D
%</pdftex>
\dim_eval:n {#1} \scan_stop:
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_backend_destination:nn}
% \begin{macro}{\@@_backend_destination:nnnn}
% A simple task: pass the data to the primitive. The |\scan_stop:| deals
% with the danger of an unterminated keyword. The zoom given here is a
% percentage, but we need to pass it as \emph{per mille}. The rectangle
% version is also easy as everything is build in.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_destination:nn #1#2
{
%<*luatex>
\tex_pdfextension:D dest ~
%</luatex>
%<*pdftex>
\tex_pdfdest:D
%</pdftex>
name {#1}
\str_case:nnF {#2}
{
{ xyz } { xyz }
{ fit } { fit }
{ fitb } { fitb }
{ fitbh } { fitbh }
{ fitbv } { fitbv }
{ fith } { fith }
{ fitv } { fitv }
{ fitr } { fitr }
}
{ xyz ~ zoom \fp_eval:n { #2 * 10 } }
\scan_stop:
}
\cs_new_protected:Npn \@@_backend_destination:nnnn #1#2#3#4
{
%<*luatex>
\tex_pdfextension:D dest ~
%</luatex>
%<*pdftex>
\tex_pdfdest:D
%</pdftex>
name {#1}
fitr ~
width \dim_eval:n {#2} ~
height \dim_eval:n {#3} ~
depth \dim_eval:n {#4} \scan_stop:
}
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \subsubsection{Catalogue entries}
%
% \begin{macro}{\@@_backend_catalog_gput:nn, \@@_backend_info_gput:nn}
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_catalog_gput:nn #1#2
{
%<*luatex>
\tex_pdfextension:D catalog
%</luatex>
%<*pdftex>
\tex_pdfcatalog:D
%</pdftex>
{ / #1 ~ #2 }
}
\cs_new_protected:Npn \@@_backend_info_gput:nn #1#2
{
%<*luatex>
\tex_pdfextension:D info
%</luatex>
%<*pdftex>
\tex_pdfinfo:D
%</pdftex>
{ / #1 ~ #2 }
}
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Objects}
%
% \begin{variable}{\g_@@_backend_object_prop}
% For tracking objects to allow finalisation.
% \begin{macrocode}
\prop_new:N \g_@@_backend_object_prop
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\@@_backend_object_new:nn}
% \begin{macro}[EXP]{\@@_backend_object_ref:n}
% Declaring objects means reserving at the PDF level plus starting
% tracking.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_object_new:nn #1#2
{
%<*luatex>
\tex_pdfextension:D obj ~
%</luatex>
%<*pdftex>
\tex_pdfobj:D
%</pdftex>
reserveobjnum ~
\int_const:cn
{ c_@@_backend_object_ \tl_to_str:n {#1} _int }
%<*luatex>
{ \tex_pdffeedback:D lastobj }
%</luatex>
%<*pdftex>
{ \tex_pdflastobj:D }
%</pdftex>
\prop_gput:Nnn \g_@@_backend_object_prop {#1} {#2}
}
\cs_new:Npn \@@_backend_object_ref:n #1
{ \int_use:c { c_@@_backend_object_ \tl_to_str:n {#1} _int } ~ 0 ~ R }
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_backend_object_write:nn,\@@_backend_object_write:nx}
% \begin{macro}[EXP]{\@@_exp_not_i:nn, \@@_exp_not_ii:nn}
% Writing the data needs a little information about the structure of the
% object.
% \begin{macrocode}
\cs_new_protected:Npn \@@_backend_object_write:nn #1#2
{
%<*luatex>
\tex_immediate:D \tex_pdfextension:D obj ~
%</luatex>
%<*pdftex>
\tex_immediate:D \tex_pdfobj:D
%</pdftex>
useobjnum ~