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-% \iffalse meta-comment
-%
-%% File: l3backend-pdf.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-pdf} module\\ 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 2024-03-14}
-%
-% \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 most backends.
-%
-% \begin{macrocode}
-%<*!dvisvgm>
-% \end{macrocode}
-%
-% \begin{variable}{\l_@@_internal_box}
-% \begin{macrocode}
-\box_new:N \l_@@_internal_box
-% \end{macrocode}
-% \end{variable}
-%
-% \begin{macrocode}
-%</!dvisvgm>
-% \end{macrocode}
-%
-% \subsection{\texttt{dvips} backend}
-%
-% \begin{macrocode}
-%<*dvips>
-% \end{macrocode}
-%
-% \begin{macro}{\@@_backend_pdfmark:n, \@@_backend_pdfmark:e}
-% 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 { e }
-% \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}
-% For tracking objects.
-% \begin{macrocode}
-\int_new:N \g_@@_backend_object_int
-% \end{macrocode}
-% \end{variable}
-%
-% \begin{macro}{\@@_backend_object_new:n}
-% \begin{macro}[EXP]{\@@_backend_object_ref:n}
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_object_new:n #1
- {
- \int_gincr:N \g_@@_backend_object_int
- \int_const:cn
- { c_@@_object_ \tl_to_str:n {#1} _int }
- { \g_@@_backend_object_int }
- }
-\cs_new:Npn \@@_backend_object_ref:n #1
- { { pdf.obj \int_use:c { c_@@_object_ \tl_to_str:n {#1} _int } } }
-% \end{macrocode}
-% \end{macro}
-% \end{macro}
-%
-% \begin{macro}
-% {
-% \@@_backend_object_write:nnn, \@@_backend_object_write:nne,
-% \@@_backend_object_write_aux:nnn
-% }
-% \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. To allow code sharing with the anonymous version, we use an
-% auxiliary.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_object_write:nnn #1#2#3
- {
- \@@_backend_object_write_aux:nnn
- { \@@_backend_object_ref:n {#1} }
- {#2} {#3}
- }
-\cs_generate_variant:Nn \@@_backend_object_write:nnn { nne }
-\cs_new_protected:Npn \@@_backend_object_write_aux:nnn #1#2#3
- {
- \@@_backend_pdfmark:e
- {
- /_objdef ~ #1
- /type
- \str_case:nn {#2}
- {
- { array } { /array }
- { dict } { /dict }
- { fstream } { /stream }
- { stream } { /stream }
- }
- /OBJ
- }
- \use:c { @@_backend_object_write_ #2 :nn } {#1} {#3}
- }
-\cs_new_protected:Npn \@@_backend_object_write_array:nn #1#2
- {
- \@@_backend_pdfmark:e
- { #1 ~0~ [ ~ \exp_not:n {#2} ~ ] ~ /PUTINTERVAL }
- }
-\cs_new_protected:Npn \@@_backend_object_write_dict:nn #1#2
- {
- \@@_backend_pdfmark:e
- { #1 << \exp_not:n {#2} >> /PUT }
- }
-\cs_new_protected:Npn \@@_backend_object_write_fstream:nn #1#2
- {
- \exp_args:Ne
- \@@_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:Ne
- \@@_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:ne}
-% 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_object_write_aux:nnn
- { { pdf.obj \int_use:N \g_@@_backend_object_int } }
- {#1} {#2}
- }
-\cs_generate_variant:Nn \@@_backend_object_now:nn { ne }
-% \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:e
- {
- /_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:}
-% 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{}.
-%
-% Notice that the link setup here uses |/Action| not |/A|. That is because
-% Distiller \emph{requires} this trigger word, rather than a \enquote{raw}
-% PDF dictionary key (Ghostscript can handle either form).
-%
-% 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 generic 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 /Action << /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} }
- }
-% \end{macrocode}
-% The definition of |pdf.link.dict| here is needed as there is code in the
-% PostScript headers for breaking links, and that can only work with this
-% available.
-% \begin{macrocode}
-\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:Ne \@@_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:e
- {
- 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:e
- {
- /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:e
- {
- /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}
-%
-% 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 \l_shipout_box
- {
- \vbox_set:Nn \l_shipout_box
- {
- \__kernel_backend_postscript:n
- {
- pdf.globaldict /pdf.brokenlink.rect ~ known
- { pdf.bordertracking.continue }
- if
- }
- \vbox_unpack_drop:N \l_shipout_box
- \__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}
-%
-% \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:e
- {
- /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:e
- {
- /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}
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_version_major_gset:n #1
- {
- \cs_gset:Npe \@@_backend_version_major: { \int_eval:n {#1} }
- }
-\cs_new_protected:Npn \@@_backend_version_minor_gset:n #1
- {
- \cs_gset:Npe \@@_backend_version_minor: { \int_eval: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:Npe \@@_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:Npe \@@_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:n}
-% \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:n #1
- {
-%<*luatex>
- \tex_pdfextension:D obj ~
-%</luatex>
-%<*pdftex>
- \tex_pdfobj:D
-%</pdftex>
- reserveobjnum ~
- \int_const:cn
- { c_@@_object_ \tl_to_str:n {#1} _int }
-%<*luatex>
- { \tex_pdffeedback:D lastobj }
-%</luatex>
-%<*pdftex>
- { \tex_pdflastobj:D }
-%</pdftex>
- }
-\cs_new:Npn \@@_backend_object_ref:n #1
- { \int_use:c { c_@@_object_ \tl_to_str:n {#1} _int } ~ 0 ~ R }
-% \end{macrocode}
-% \end{macro}
-% \end{macro}
-%
-% \begin{macro}{\@@_backend_object_write:nnn, \@@_backend_object_write:nne}
-% \begin{macro}[EXP]{\@@_backend_object_write:nn}
-% \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:nnn #1#2#3
- {
-%<*luatex>
- \tex_immediate:D \tex_pdfextension:D obj ~
-%</luatex>
-%<*pdftex>
- \tex_immediate:D \tex_pdfobj:D
-%</pdftex>
- useobjnum ~
- \int_use:c
- { c_@@_object_ \tl_to_str:n {#1} _int }
- \@@_backend_object_write:nn {#2} {#3}
- }
-\cs_new:Npn \@@_backend_object_write:nn #1#2
- {
- \str_case:nn {#1}
- {
- { array } { { [ ~ \exp_not:n {#2} ~ ] } }
- { dict } { { << ~ \exp_not:n {#2} ~ >> } }
- { fstream }
- {
- stream ~ attr ~ { \@@_exp_not_i:nn #2 } ~
- file ~ { \@@_exp_not_ii:nn #2 }
- }
- { stream }
- {
- stream ~ attr ~ { \@@_exp_not_i:nn #2 } ~
- { \@@_exp_not_ii:nn #2 }
- }
- }
- }
-\cs_generate_variant:Nn \@@_backend_object_write:nnn { nne }
-\cs_new:Npn \@@_exp_not_i:nn #1#2 { \exp_not:n {#1} }
-\cs_new:Npn \@@_exp_not_ii:nn #1#2 { \exp_not:n {#2} }
-% \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-%
-% \begin{macro}{\@@_backend_object_now:nn, \@@_backend_object_now:ne}
-% Much like writing, but direct creation.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_object_now:nn #1#2
- {
-%<*luatex>
- \tex_immediate:D \tex_pdfextension:D obj ~
-%</luatex>
-%<*pdftex>
- \tex_immediate:D \tex_pdfobj:D
-%</pdftex>
- \@@_backend_object_write:nn {#1} {#2}
- }
-\cs_generate_variant:Nn \@@_backend_object_now:nn { ne }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}[EXP]{\@@_backend_object_last:}
-% Much like annotation.
-% \begin{macrocode}
-\cs_new:Npe \@@_backend_object_last:
- {
- \exp_not:N \int_value:w
-%<*luatex>
- \exp_not:N \tex_pdffeedback:D lastobj ~
-%</luatex>
-%<*pdftex>
- \exp_not:N \tex_pdflastobj:D
-%</pdftex>
- \c_space_tl 0 ~ R
- }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}[EXP]{\@@_backend_pageobject_ref:n}
-% The usual wrapper situation; the three spaces here are essential.
-% \begin{macrocode}
-\cs_new:Npe \@@_backend_pageobject_ref:n #1
- {
- \exp_not:N \int_value:w
-%<*luatex>
- \exp_not:N \tex_pdffeedback:D pageref
-%</luatex>
-%<*pdftex>
- \exp_not:N \tex_pdfpageref:D
-%</pdftex>
- \c_space_tl #1 \c_space_tl \c_space_tl \c_space_tl 0 ~ R
- }
-% \end{macrocode}
-% \end{macro}
-%
-% \subsubsection{Structure}
-%
-% \begin{macro}{\@@_backend_compresslevel:n}
-% \begin{macro}{\@@_backend_compress_objects:n}
-% \begin{macro}{\@@_backend_objcompresslevel:n}
-% Simply pass data to the engine.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_compresslevel:n #1
- {
- \tex_global:D
-%<*luatex>
- \tex_pdfvariable:D compresslevel
-%</luatex>
-%<*pdftex>
- \tex_pdfcompresslevel:D
-%</pdftex>
- \int_value:w \int_eval:n {#1} \scan_stop:
- }
-\cs_new_protected:Npn \@@_backend_compress_objects:n #1
- {
- \bool_if:nTF {#1}
- { \@@_backend_objcompresslevel:n { 2 } }
- { \@@_backend_objcompresslevel:n { 0 } }
- }
-\cs_new_protected:Npn \@@_backend_objcompresslevel:n #1
- {
- \tex_global:D
-%<*luatex>
- \tex_pdfvariable:D objcompresslevel
-%</luatex>
-%<*pdftex>
- \tex_pdfobjcompresslevel:D
-%</pdftex>
- #1 \scan_stop:
- }
-% \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-%
-% \begin{macro}
-% {\@@_backend_version_major_gset:n, \@@_backend_version_minor_gset:n}
-% The availability of the primitive is not universal, so we have to test
-% at load time.
-% \begin{macrocode}
-\cs_new_protected:Npe \@@_backend_version_major_gset:n #1
- {
-%<*luatex>
- \int_compare:nNnT \tex_luatexversion:D > { 106 }
- {
- \exp_not:N \tex_global:D \tex_pdfvariable:D majorversion
- \exp_not:N \int_eval:n {#1} \scan_stop:
- }
-%</luatex>
-%<*pdftex>
- \cs_if_exist:NT \tex_pdfmajorversion:D
- {
- \exp_not:N \tex_global:D \tex_pdfmajorversion:D
- \exp_not:N \int_eval:n {#1} \scan_stop:
- }
-%</pdftex>
- }
-\cs_new_protected:Npn \@@_backend_version_minor_gset:n #1
- {
- \tex_global:D
-%<*luatex>
- \tex_pdfvariable:D minorversion
-%</luatex>
-%<*pdftex>
- \tex_pdfminorversion:D
-%</pdftex>
- \int_eval:n {#1} \scan_stop:
- }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}[EXP]{\@@_backend_version_major:, \@@_backend_version_minor:}
-% As above.
-% \begin{macrocode}
-\cs_new:Npe \@@_backend_version_major:
- {
-%<*luatex>
- \int_compare:nNnTF \tex_luatexversion:D > { 106 }
- { \exp_not:N \tex_the:D \tex_pdfvariable:D majorversion }
- { 1 }
-%</luatex>
-%<*pdftex>
- \cs_if_exist:NTF \tex_pdfmajorversion:D
- { \exp_not:N \tex_the:D \tex_pdfmajorversion:D }
- { 1 }
-%</pdftex>
- }
-\cs_new:Npn \@@_backend_version_minor:
- {
- \tex_the:D
-%<*luatex>
- \tex_pdfvariable:D minorversion
-%</luatex>
-%<*pdftex>
- \tex_pdfminorversion:D
-%</pdftex>
- }
-% \end{macrocode}
-% \end{macro}
-%
-% \subsubsection{Marked content}
-%
-% \begin{macro}{\@@_backend_bdc:nn}
-% \begin{macro}{\@@_backend_emc:}
-% Simple wrappers. May need refinement: see
-% \url{https://chat.stackexchange.com/transcript/message/49970158#49970158}.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_bdc:nn #1#2
- { \__kernel_backend_literal_page:n { /#1 ~ #2 ~ BDC } }
-\cs_new_protected:Npn \@@_backend_emc:
- { \__kernel_backend_literal_page:n { EMC } }
-% \end{macrocode}
-% \end{macro}
-% \end{macro}
-%
-% \begin{macrocode}
-%</luatex|pdftex>
-% \end{macrocode}
-%
-% \subsection{\texttt{dvipdfmx} backend}
-%
-% \begin{macrocode}
-%<*dvipdfmx|xetex>
-% \end{macrocode}
-%
-% \begin{macro}{\@@_backend:n, \@@_backend:e}
-% A generic function for the backend PDF specials: used where we can.
-% \begin{macrocode}
-\cs_new_protected:Npe \@@_backend:n #1
- { \__kernel_backend_literal:n { pdf: #1 } }
-\cs_generate_variant:Nn \@@_backend:n { e }
-% \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:n { put ~ @catalog << /#1 ~ #2 >> } }
-\cs_new_protected:Npn \@@_backend_info_gput:nn #1#2
- { \@@_backend:n { docinfo << /#1 ~ #2 >> } }
-% \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:n}
-% \begin{macro}[EXP]{\@@_backend_object_ref:n}
-% Objects are tracked at the macro level, but we don't have to do anything
-% at this stage.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_object_new:n #1
- {
- \int_gincr:N \g_@@_backend_object_int
- \int_const:cn
- { c_@@_object_ \tl_to_str:n {#1} _int }
- { \g_@@_backend_object_int }
- }
-\cs_new:Npn \@@_backend_object_ref:n #1
- { @pdf.obj \int_use:c { c_@@_object_ \tl_to_str:n {#1} _int } }
-% \end{macrocode}
-% \end{macro}
-% \end{macro}
-%
-% \begin{macro}{\@@_backend_object_write:nnn, \@@_backend_object_write:nne}
-% \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:nnnn}
-% This is where we choose the actual type.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_object_write:nnn #1#2#3
- {
- \use:c { @@_backend_object_write_ #2 :nn }
- { \@@_backend_object_ref:n {#1} } {#3}
- }
-\cs_generate_variant:Nn \@@_backend_object_write:nnn { nne }
-\cs_new_protected:Npn \@@_backend_object_write_array:nn #1#2
- {
- \@@_backend:e
- { obj ~ #1 ~ [ ~ \exp_not:n {#2} ~ ] }
- }
-\cs_new_protected:Npn \@@_backend_object_write_dict:nn #1#2
- {
- \@@_backend:e
- { obj ~ #1 ~ << ~ \exp_not:n {#2} ~ >> }
- }
-\cs_new_protected:Npn \@@_backend_object_write_fstream:nn #1#2
- { \@@_backend_object_write_stream:nnnn { f } {#1} #2 }
-\cs_new_protected:Npn \@@_backend_object_write_stream:nn #1#2
- { \@@_backend_object_write_stream:nnnn { } {#1} #2 }
-\cs_new_protected:Npn \@@_backend_object_write_stream:nnnn #1#2#3#4
- {
- \@@_backend:e
- {
- #1 stream ~ #2 ~
- ( \exp_not:n {#4} ) ~ << \exp_not:n {#3} >>
- }
- }
-% \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-%
-% \begin{macro}{\@@_backend_object_now:nn, \@@_backend_object_now:ne}
-% No anonymous objects with \texttt{dvipdfmx} so we have to give an
-% object name.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_object_now:nn #1#2
- {
- \int_gincr:N \g_@@_backend_object_int
- \exp_args:Nne \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 { ne }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\@@_backend_object_last:}
-% \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{dvipdfmx}/\XeTeX{}.
-% \begin{macrocode}
-\cs_new:Npn \@@_backend_pageobject_ref:n #1
- { @page #1 }
-% \end{macrocode}
-% \end{macro}
-%
-% \subsubsection{Annotations}
-%
-% \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}
-% 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
- {
- \int_gincr:N \g_@@_backend_object_int
- \int_gset_eq:NN \g_@@_backend_annotation_int \g_@@_backend_object_int
- \@@_backend:e
- {
- ann ~ @pdf.obj \int_use:N \g_@@_backend_object_int \c_space_tl
- width ~ \dim_eval:n {#1} ~
- height ~ \dim_eval:n {#2} ~
- depth ~ \dim_eval:n {#3} ~
- << /Type /Annot #4 >>
- }
- }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\@@_backend_annotation_last:}
-% \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{macro}
-% {\@@_backend_link_begin_goto:nnw, \@@_backend_link_begin_user:nnw}
-% \begin{macro}{\@@_backend_link_begin:n}
-% \begin{macro}{\@@_backend_link_end:}
-% All created using the same internals.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_link_begin_goto:nnw #1#2
- { \@@_backend_link_begin:n { #1 /Subtype /Link /A << /S /GoTo /D ( #2 ) >> } }
-\cs_new_protected:Npn \@@_backend_link_begin_user:nnw #1#2
- { \@@_backend_link_begin:n {#1#2} }
-\cs_new_protected:Npe \@@_backend_link_begin:n #1
- {
- \exp_not:N \int_gincr:N \exp_not:N \g_@@_backend_link_int
- \@@_backend:e
- {
- bann ~
- @pdf.lnk
- \exp_not:N \int_use:N \exp_not:N \g_@@_backend_link_int
- \c_space_tl
- <<
- /Type /Annot
- #1
- >>
- }
- }
-\cs_new_protected:Npn \@@_backend_link_end:
- { \@@_backend:n { eann } }
-% \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-%
-% \begin{macro}{\@@_backend_link_last:}
-% Available using the backend mechanism with a suitably-recent
-% version.
-% \begin{macrocode}
-\cs_new:Npn \@@_backend_link_last:
- { @pdf.lnk \int_use:N \g_@@_backend_link_int }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\@@_backend_link_margin:n}
-% Pass to \texttt{dvipdfmx}.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_link_margin:n #1
- { \__kernel_backend_literal:e { dvipdfmx:config~g~ \dim_eval:n {#1} } }
-% \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. The method for \texttt{FitR}
-% is from Alexander Grahn: the idea is to avoid needing to do any calculations
-% in \TeX{} by using the backend data for \texttt{@xpos} and \texttt{@ypos}.
-% \texttt{/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
- {
- \@@_backend:e
- {
- dest ~ ( \exp_not:n {#1} )
- [
- @thispage
- \str_case:nnF {#2}
- {
- { xyz } { /XYZ ~ @xpos ~ @ypos ~ null }
- { fit } { /Fit }
- { fitb } { /FitB }
- { fitbh } { /FitBH }
- { fitbv } { /FitBV ~ @xpos }
- { fith } { /FitH ~ @ypos }
- { fitv } { /FitV ~ @xpos }
- { fitr } { /Fit }
- }
- { /XYZ ~ @xpos ~ @ypos ~ \fp_eval:n { (#2) / 100 } }
- ]
- }
- }
-\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
- {
- \@@_backend:n { obj ~ @pdf_ #2 _llx ~ @xpos }
- \@@_backend:n { obj ~ @pdf_ #2 _lly ~ @ypos }
- }
- \tex_vss:D
- }
- \__kernel_kern:n {#1}
- \vbox_to_zero:n
- {
- \__kernel_kern:n { -#3 }
- \hbox:n
- {
- \@@_backend:n
- {
- dest ~ (#2)
- [
- @thispage
- /FitR ~
- @pdf_ #2 _llx ~ @pdf_ #2 _lly ~
- @xpos ~ @ypos
- ]
- }
- }
- \tex_vss:D
- }
- \__kernel_kern:n { -#1 }
- }
-% \end{macrocode}
-% \end{macro}
-% \end{macro}
-%
-% \subsubsection{Structure}
-%
-% \begin{macro}{\@@_backend_compresslevel:n}
-% \begin{macro}{\@@_backend_compress_objects:n}
-% Pass data to the backend: these are a one-shot.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_compresslevel:n #1
- { \__kernel_backend_literal:e { dvipdfmx:config~z~ \int_eval:n {#1} } }
-\cs_new_protected:Npn \@@_backend_compress_objects:n #1
- {
- \bool_if:nF {#1}
- { \__kernel_backend_literal:n { dvipdfmx:config~C~0x40 } }
- }
-% \end{macrocode}
-% \end{macro}
-% \end{macro}
-%
-% \begin{macro}
-% {\@@_backend_version_major_gset:n, \@@_backend_version_minor_gset:n}
-% We start with the assumption that the default is active.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_version_major_gset:n #1
- {
- \cs_gset:Npe \@@_backend_version_major: { \int_eval:n {#1} }
- \__kernel_backend_literal:e { pdf:majorversion~ \@@_backend_version_major: }
- }
-\cs_new_protected:Npn \@@_backend_version_minor_gset:n #1
- {
- \cs_gset:Npe \@@_backend_version_minor: { \int_eval:n {#1} }
- \__kernel_backend_literal:e { pdf:minorversion~ \@@_backend_version_minor: }
- }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}[EXP]{\@@_backend_version_major:, \@@_backend_version_minor:}
-% We start with the assumption that the default is active.
-% \begin{macrocode}
-\cs_new:Npn \@@_backend_version_major: { 1 }
-\cs_new:Npn \@@_backend_version_minor: { 5 }
-% \end{macrocode}
-% \end{macro}
-%
-% \subsubsection{Marked content}
-%
-% \begin{macro}{\@@_backend_bdc:nn}
-% \begin{macro}{\@@_backend_emc:}
-% Simple wrappers. May need refinement: see
-% \url{https://chat.stackexchange.com/transcript/message/49970158#49970158}.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_bdc:nn #1#2
- { \__kernel_backend_literal_page:n { /#1 ~ #2 ~ BDC } }
-\cs_new_protected:Npn \@@_backend_emc:
- { \__kernel_backend_literal_page:n { EMC } }
-% \end{macrocode}
-% \end{macro}
-% \end{macro}
-%
-% \begin{macrocode}
-%</dvipdfmx|xetex>
-% \end{macrocode}
-%
-% \subsection{\texttt{dvisvgm} backend}
-%
-% \begin{macrocode}
-%<*dvisvgm>
-% \end{macrocode}
-%
-% \subsubsection{Annotations}
-%
-% \begin{macro}{\@@_backend_annotation:nnnn}
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_annotation:nnnn #1#2#3#4 { }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}[EXP]{\@@_backend_annotation_last:}
-% \begin{macrocode}
-\cs_new:Npn \@@_backend_annotation_last: { }
-% \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:}
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_link_begin_goto:nnw #1#2 { }
-\cs_new_protected:Npn \@@_backend_link_begin_user:nnw #1#2 { }
-\cs_new_protected:Npn \@@_backend_link_begin:nnnw #1#2#3 { }
-\cs_new_protected:Npn \@@_backend_link_end: { }
-% \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-%
-% \begin{macro}{\@@_backend_link_last:}
-% \begin{macrocode}
-\cs_new:Npe \@@_backend_link_last: { }
-% \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 { }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macro}{\@@_backend_destination:nn}
-% \begin{macro}{\@@_backend_destination:nnnn}
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_destination:nn #1#2 { }
-\cs_new_protected:Npn \@@_backend_destination:nnnn #1#2#3#4 { }
-% \end{macrocode}
-% \end{macro}
-% \end{macro}
-%
-% \subsubsection{Catalogue entries}
-%
-% \begin{macro}{\@@_backend_catalog_gput:nn, \@@_backend_info_gput:nn}
-% No-op.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_catalog_gput:nn #1#2 { }
-\cs_new_protected:Npn \@@_backend_info_gput:nn #1#2 { }
-% \end{macrocode}
-% \end{macro}
-%
-% \subsubsection{Objects}
-%
-% \begin{macro}{\@@_backend_object_new:n}
-% \begin{macro}[EXP]{\@@_backend_object_ref:n}
-% \begin{macro}{\@@_backend_object_write:nnn, \@@_backend_object_write:ne}
-% \begin{macro}{\@@_backend_object_now:nn, , \@@_backend_object_now:ne}
-% \begin{macro}{\@@_backend_object_last:}
-% \begin{macro}[EXP]{\@@_backend_pageobject_ref:n}
-% All no-ops here.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_object_new:nn #1 { }
-\cs_new:Npn \@@_backend_object_ref:n #1 { }
-\cs_new_protected:Npn \@@_backend_object_write:nnn #1#2#3 { }
-\cs_new_protected:Npn \@@_backend_object_write:nne #1#2#3 { }
-\cs_new_protected:Npn \@@_backend_object_now:nn #1#2 { }
-\cs_new_protected:Npn \@@_backend_object_now:ne #1#2 { }
-\cs_new:Npn \@@_backend_object_last: { }
-\cs_new:Npn \@@_backend_pageobject_ref:n #1 { }
-% \end{macrocode}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-% \end{macro}
-%
-% \subsubsection{Structure}
-%
-% \begin{macro}{\@@_backend_compresslevel:n}
-% \begin{macro}{\@@_backend_compress_objects:n}
-% These are all no-ops.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_compresslevel:n #1 { }
-\cs_new_protected:Npn \@@_backend_compress_objects:n #1 { }
-% \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}
-%
-% \begin{macro}{\@@_backend_bdc:nn}
-% \begin{macro}{\@@_backend_emc:}
-% More no-ops.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_bdc:nn #1#2 { }
-\cs_new_protected:Npn \@@_backend_emc: { }
-% \end{macrocode}
-% \end{macro}
-% \end{macro}
-%
-% \begin{macrocode}
-%</dvisvgm>
-% \end{macrocode}
-%
-% \subsection{PDF Page size (media box)}
-%
-% For setting the media box, the split between backends is somewhat different
-% to other areas, thus we approach this separately. The code here assumes a
-% recent \LaTeXe{}: that is ensured at the level above.
-%
-% \begin{macrocode}
-%<*dvipdfmx|dvips>
-% \end{macrocode}
-%
-% \begin{macro}{\@@_backend_pagesize_gset:nn}
-% This is done as a backend literal, so we deal with it using the shipout
-% hook.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_pagesize_gset:nn #1#2
- {
- \__kernel_backend_first_shipout:n
- {
- \__kernel_backend_literal:e
- {
-%<*dvipdfmx>
- pdf:pagesize ~
- width ~ \dim_eval:n {#1} ~
- height ~ \dim_eval:n {#2}
-%</dvipdfmx>
-%<*dvips>
- papersize = \dim_eval:n {#1} , \dim_eval:n {#2}
-%</dvips>
- }
- }
- }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macrocode}
-%</dvipdfmx|dvips>
-% \end{macrocode}
-%
-% \begin{macrocode}
-%<*luatex|pdftex|xetex>
-% \end{macrocode}
-%
-% \begin{macro}{\@@_backend_pagesize_gset:nn}
-% Pass to the primitives.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_pagesize_gset:nn #1#2
- {
- \dim_gset:Nn \tex_pagewidth:D {#1}
- \dim_gset:Nn \tex_pageheight:D {#2}
- }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macrocode}
-%</luatex|pdftex|xetex>
-% \end{macrocode}
-%
-% \begin{macrocode}
-%<*dvisvgm>
-% \end{macrocode}
-%
-% \begin{macro}{\@@_backend_pagesize_gset:nn}
-% A no-op.
-% \begin{macrocode}
-\cs_new_protected:Npn \@@_backend_pagesize_gset:nn #1#2 { }
-% \end{macrocode}
-% \end{macro}
-%
-% \begin{macrocode}
-%</dvisvgm>
-% \end{macrocode}
-%
-% \begin{macrocode}
-%</package>
-% \end{macrocode}
-%
-% \end{implementation}
-%
-% \PrintIndex