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l3drivers.dtx
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l3drivers.dtx
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% \iffalse meta-comment
%
%% File: l3drivers.dtx Copyright(C) 2011-2018 The LaTeX3 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 "l3kernel 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{l3drivers} package\\ Drivers^^A
% }
%
% \author{^^A
% The \LaTeX3 Project\thanks
% {^^A
% E-mail:
% \href{mailto:latex-team@latex-project.org}
% {latex-team@latex-project.org}^^A
% }^^A
% }
%
% \date{Released 2018/02/21}
%
% \maketitle
%
% \begin{documentation}
%
% \TeX{} relies on drivers in order to carry out a number of tasks, such
% as using color, including graphics and setting up hyper-links. The nature
% of the code required depends on the exact driver in use. Currently,
% \LaTeX3 is aware of the following drivers:
% \begin{itemize}
% \item \texttt{pdfmode}: The \enquote{driver} for direct PDF output by
% \emph{both} \pdfTeX{} and \LuaTeX{} (no separate driver is used in this
% case: the engine deals with PDF creation itself).
% \item \texttt{dvips}: The \texttt{dvips} program, which works in
% conjugation with \pdfTeX{} or \LuaTeX{} in DVI mode.
% \item \texttt{dvipdfmx}: The \texttt{dvipdfmx} program, which works in
% conjugation with \pdfTeX{} or \LuaTeX{} in DVI mode.
% \item \texttt{dvisvgm}: The \texttt{dvisvgm} program, which works in
% conjugation with \pdfTeX{} or \LuaTeX{} when run in DVI mode as well
% as with (u)p\TeX{} and \XeTeX{}.
% \item \texttt{xdvipdfmx}: The driver used by \XeTeX{}.
% \end{itemize}
%
% This module provides code closely tied to the exact driver in use: broadly,
% the functions here are implemented entirely independently for each case.
% As such, they often rely on higher-level code to provide necessary but
% shared operations. For example, in box rotation and scaling the functions
% here do no correct the final size of the box: this will always be required
% and thus is handled in the \pkg{box} module.
%
% Several of the operations here are low-level, and so may be used only in
% restricted contexts. Some also require understanding of PostScript/PDF
% concepts to be used corrected as they take \enquote{raw} arguments, similar
% in format to those used by the underlying driver.
%
% The functions in this module should be regarded as experimental with
% the following exceptions:
% \begin{itemize}
% \item \dots
% \end{itemize}
%
% \section{Box clipping}
%
% \begin{function}[added = 2017-12-13]{\driver_box_use_clip:N}
% \begin{syntax}
% \cs{driver_box_use_clip:N} \meta{box}
% \end{syntax}
% Inserts the content of the \meta{box} at the current insertion point
% such that any material outside of the bounding box is not displayed
% by the driver. The material in the \meta{box} is still placed in the
% output stream: the clipping takes place at a driver level.
% \end{function}
%
% \section{Box rotation and scaling}
%
% \begin{function}[added = 2017-12-13]{\driver_box_use_rotate:Nn}
% \begin{syntax}
% \cs{driver_box_use_rotate:Nn} \meta{box} \Arg{angle}
% \end{syntax}
% Inserts the content of the \meta{box} at the current insertion point
% rotated by the \meta{angle} (expressed in degrees). The material is
% rotated such the the \TeX{} reference point of the box is the center of
% rotation and remains the reference point after rotation. It is the
% responsibility of the code using this function to adjust the apparent
% size of the inserted material.
% \end{function}
%
% \begin{function}[added = 2017-12-13]{\driver_box_use_scale:Nnn}
% \begin{syntax}
% \cs{driver_box_use_scale:Nnn} \meta{box} \Arg{x-scale} \Arg{y-scale}
% \end{syntax}
% Inserts the content of the \meta{box} at the current insertion point
% scale by the \meta{x-scale} and \meta{y-scale}. The reference point
% of the material will be unchanged. It is the responsibility of the
% code using this function to adjust the apparent size of the inserted
% material.
% \end{function}
%
% \section{Color support}
%
% \begin{function}[added = 2018-02-20]{\driver_color_cmyk:nnnn}
% \begin{syntax}
% \cs{driver_color_cmyk:nnnn} \Arg{cyan} \Arg{magenta} \Arg{yellow}
% \Arg{black}
% \end{syntax}
% Sets the color to the CMYK values specified, all of which are
% fp denotations in the range $0$ and $1$. For drawing colors, see
% \cs{driver_draw_color_cmyk:nnnn}, \emph{etc.}
% \end{function}
%
% \begin{function}[added = 2018-02-20]{\driver_color_gray:n}
% \begin{syntax}
% \cs{driver_color_gray:n} \Arg{gray}
% \end{syntax}
% Sets the color to the grayscale value specified, which is
% fp denotations in the range $0$ and $1$. For drawing colors, see
% \cs{driver_draw_color_gray:n}, \emph{etc.}
% \end{function}
%
% \begin{function}[added = 2018-02-20]{\driver_color_rgb:nnn}
% \begin{syntax}
% \cs{driver_color_rgb:nnn} \Arg{red} \Arg{green} \Arg{blue}
% \end{syntax}
% Sets the color to the RGB values specified, all of which are
% fp denotations in the range $0$ and $1$. For drawing colors, see
% \cs{driver_draw_color_rgb:nnn}, \emph{etc.}
% \end{function}
%
% \begin{function}[added = 2018-02-20]{\driver_color_reset:}
% \begin{syntax}
% \cs{driver_color_reset:}
% \end{syntax}
% Resets the active color to that before a call to
% \cs{driver_color_\meta{model}:n(nnn)}. This function should be inserted
% after the \TeX{} group setting a color, \emph{i.e.}~normally
% \begin{verbatim}
% % Use of \driver_color_rgb:nnn, etc.
% \group_insert_after:N \driver_color_reset:
% \end{verbatim}
% \end{function}
%
% \begin{function}[added = 2018-02-20]{\driver_color_pickup:N}
% \begin{syntax}
% \cs{driver_color_pickup:N} \meta{tl}
% \end{syntax}
% In \LaTeXe{} package mode, collects data on the current color from
% \tn{current@color} and stores it in the low-level format used by \pkg{expl3}
% in the \meta{tl}.
% \end{function}
%
% \section{Drawing}
%
% The drawing functions provided here are \emph{highly} experimental. They
% are inspired heavily by the system layer of \pkg{pgf} (most have the
% same interface as the same functions in the latter's \cs{pgfsys@\ldots}
% namespace). They are intended to form the basis for higher level drawing
% interfaces, which themselves are likely to be further abstracted for user
% access. Again, this model is heavily inspired by \pkg{pgf} and
% Ti\textit{k}z.
%
% These low level drawing interfaces abstract from the driver raw requirements
% but still require an appreciation of the concepts of PostScript/PDF/SVG
% graphic creation.
%
% \begin{function}
% {\driver_draw_begin:, \driver_draw_end:}
% \begin{syntax}
% \cs{driver_draw_begin:}
% \meta{content}
% \cs{driver_draw_end:}
% \end{syntax}
% Defines a drawing environment. This is a scope for the purposes of
% the graphics state. Depending on the driver, other set up may or may not
% take place here. The natural size of the \meta{content} should be zero
% from the \TeX{} perspective: allowance for the size of the content must
% be made at a higher level (or indeed this can be skipped if the content is
% to overlap other material).
% \end{function}
%
% \begin{function}
% {\driver_draw_scope_begin:, \driver_draw_scope_end:}
% \begin{syntax}
% \cs{driver_draw_scope_begin:}
% \meta{content}
% \cs{driver_draw_scope_end:}
% \end{syntax}
% Defines a scope for drawing settings and so on. Changes to the graphic
% state and concepts such as color or linewidth are localised to a scope.
% This function pair must never be used if an partial path is under
% construction: such paths must be entirely contained at one unbroken
% scope level. Note that scopes do not form \TeX{} groups and may not
% be aligned with them.
% \end{function}
%
% \subsection{Path construction}
%
% \begin{function}{\driver_draw_moveto:nn}
% \begin{syntax}
% \cs{driver_draw_move:nn} \Arg{x} \Arg{y}
% \end{syntax}
% Moves the current drawing reference point to (\meta{x}, \meta{y});
% any active transformation matrix applies.
% \end{function}
%
% \begin{function}{\driver_draw_lineto:nn}
% \begin{syntax}
% \cs{driver_draw_lineto:nn} \Arg{x} \Arg{y}
% \end{syntax}
% Adds a path from the current drawing reference point to
% (\meta{x}, \meta{y}); any active transformation matrix applies. Note
% that nothing is drawn until a fill or stroke operation is applied, and that
% the path may be discarded or used as a clip without appearing itself.
% \end{function}
%
% \begin{function}{\driver_draw_curveto:nnnnnn}
% \begin{syntax}
% \cs{driver_draw_curveto:nnnnnn} \Arg{x_1} \Arg{y_1}
% \Arg{x_2} \Arg{y_2} \Arg{x_3} \Arg{y_3}
% \end{syntax}
% Adds a Bezier curve path from the current drawing reference point to
% (\meta{x_3}, \meta{y_3}), using (\meta{x_1}, \meta{y_1}) and
% (\meta{x_2}, \meta{y_2}) as control points; any active transformation
% matrix applies. Note that nothing is drawn until a fill or stroke
% operation is applied, and that the path may be discarded or used as a clip
% without appearing itself.
% \end{function}
%
% \begin{function}{\driver_draw_rectangle:nnnn}
% \begin{syntax}
% \cs{driver_draw_rectangle:nnnn} \Arg{x} \Arg{y} \Arg{width} \Arg{height}
% \end{syntax}
% Adds rectangular path from (\meta{x_1}, \meta{y_1}) of \meta{height}
% and \meta{width}; any active transformation matrix applies. Note that
% nothing is drawn until a fill or stroke operation is applied, and that the
% path may be discarded or used as a clip without appearing itself.
% \end{function}
%
% \begin{function}{\driver_draw_closepath:}
% \begin{syntax}
% \cs{driver_draw_closepath:}
% \end{syntax}
% Closes an existing path, adding a line from the current point to the
% start of path. Note that nothing is drawn until a fill or stroke
% operation is applied, and that the path may be discarded or used as a clip
% without appearing itself.
% \end{function}
%
% \subsection{Stroking and filling}
%
% \begin{function}{\driver_draw_stroke:, \driver_draw_closestroke:}
% \begin{syntax}
% \meta{path construction}
% \cs{driver_draw_stroke:}
% \end{syntax}
% Draws a line along the current path, which is also closed by
% \cs{driver_draw_closestroke:}. The nature of the line drawn
% is influenced by settings for
% \begin{itemize}
% \item Line thickness
% \item Stroke color (or the current color if no specific stroke color
% is set)
% \item Line capping (how non-closed line ends should look)
% \item Join style (how a bend in the path should be rendered)
% \item Dash pattern
% \end{itemize}
% The path may also be used for clipping.
% \end{function}
%
% \begin{function}{\driver_draw_fill:, \driver_draw_fillstroke:}
% \begin{syntax}
% \meta{path construction}
% \cs{driver_draw_fill:}
% \end{syntax}
% Fills the area surrounded by the current path: this will be closed prior
% to filling if it is not already. The \texttt{fillstroke} version also
% strokes the path as described for \cs{driver_draw_stroke:}. The fill is
% influenced by the setting for fill color (or the current color if no
% specific stroke color is set). The path may also be used for clipping.
% For paths which are self-intersecting or comprising multiple parts, the
% determination of which areas are inside the path is made using the non-zero
% winding number rule unless the even-odd rule is active.
% \end{function}
%
% \begin{function}{\driver_draw_nonzero_rule:, \driver_draw_evenodd_rule:}
% \begin{syntax}
% \cs{driver_draw_nonzero_rule:}
% \end{syntax}
% Active either the non-zero winding number or the even-odd rule,
% respectively, for determining what is inside a fill or clip area.
% For technical reasons, these command are not influenced by scoping
% and apply on an ongoing basis.
% \end{function}
%
% \begin{function}{\driver_draw_clip:}
% \begin{syntax}
% \meta{path construction}
% \cs{driver_draw_clip:}
% \end{syntax}
% Indicates that the current path should be used for clipping, such that
% any subsequent material outside of the path (but within the current
% scope) will not be shown. This command should be given once a path is
% complete but before it is stroked or filled (if appropriate). This
% command is \emph{not} affected by scoping: it applies to exactly one
% path as shown.
% \end{function}
%
% \begin{function}{\driver_draw_discardpath:}
% \begin{syntax}
% \meta{path construction}
% \cs{driver_draw_discardpath:}
% \end{syntax}
% Discards the current path without stroking or filling. This is primarily
% useful for paths constructed purely for clipping, as this alone does not
% end the paths existence.
% \end{function}
%
% \subsection{Stroke options}
%
% \begin{function}{\driver_draw_linewidth:n}
% \begin{syntax}
% \cs{driver_draw_linewidth:n} \Arg{dimexpr}
% \end{syntax}
% Sets the width to be used for stroking to \meta{dimexpr}.
% \end{function}
%
% \begin{function}{\driver_draw_cap_dash:nn}
% \begin{syntax}
% \cs{driver_draw_dash:nn} \Arg{dash pattern} \Arg{phase}
% \end{syntax}
% Sets the pattern of dashing to be used when stroking a line. The
% \meta{dash pattern} should be a comma-separated list of dimension
% expressions. This is then interpreted as a series of pairs of line-on
% and line-off lengths. For example \texttt{3pt, 4pt} means that $3$\,pt on,
% $4$\,pt off, $3$\,pt on, and so on. A more complex pattern will also
% repeat: \texttt{3pt, 4pt, 1pt, 2pt} results in $3$\,pt on, $4$\,pt off,
% $1$\,pt on, $2$\,pt off, $3$\,pt on, and so on. An odd number of entries
% means that the last is repeated, for example \texttt{3pt} is equal to
% \texttt{3pt, 3pt}. An empty pattern yields a solid line.
%
% The \meta{phase} specifies an offset at the start of the cycle. For
% example, with a pattern \texttt{3pt} a phase of \texttt{1pt} means
% that the output is $2$\,pt on, $3$\,pt off, $3$\,pt on, $3$\,pt on,
% \emph{etc.}
% \end{function}
%
% \begin{function}
% {
% \driver_draw_cap_butt: ,
% \driver_draw_cap_rectangle: ,
% \driver_draw_cap_round:
% }
% \begin{syntax}
% \cs{driver_draw_cap_butt:}
% \end{syntax}
% Sets the style of terminal stroke position to one of butt, rectangle or
% round.
% \end{function}
%
% \begin{function}
% {
% \driver_draw_join_bevel: ,
% \driver_draw_join_miter: ,
% \driver_draw_join_round:
% }
% \begin{syntax}
% \cs{driver_draw_cap_butt:}
% \end{syntax}
% Sets the style of stroke joins to one of bevel, miter or round.
% \end{function}
%
% \begin{function}{\driver_draw_miterlimit:n}
% \begin{syntax}
% \cs{driver_draw_miterlimit:n} \Arg{dimexpr}
% \end{syntax}
% Sets the miter limit of lines joined as a miter, as described in the
% PDF and PostScript manuals.
% \end{function}
%
% \subsection{Color}
%
% \begin{function}
% {
% \driver_draw_color_fill_cmyk:nnnn ,
% \driver_draw_color_stroke_cmyk:nnnn
% }
% \begin{syntax}
% \cs{driver_draw_color_fill_cmyk:nnnn} \Arg{cyan} \Arg{magenta} \Arg{yellow}
% \Arg{black}
% \end{syntax}
% Sets the color for drawing to the CMYK values specified, all of which are
% fp denotations in the range $0$ and $1$.
% \end{function}
%
% \begin{function}
% {
% \driver_draw_color_fill_gray:n ,
% \driver_draw_color_stroke_gray:n
% }
% \begin{syntax}
% \cs{driver_draw_color_fill_gray:n} \Arg{gray}
% \end{syntax}
% Sets the color for drawing to the grayscale value specified, which is
% fp denotations in the range $0$ and $1$.
% \end{function}
%
% \begin{function}
% {
% \driver_draw_color_fill_rgb:nnn ,
% \driver_draw_color_stroke_rgb:nnn
% }
% \begin{syntax}
% \cs{driver_draw_color_fill_rgb:nnn} \Arg{red} \Arg{green} \Arg{blue}
% \end{syntax}
% Sets the color for drawing to the RGB values specified, all of which are
% fp denotations in the range $0$ and $1$.
% \end{function}
%
% \begin{function}
% {\driver_draw_color_fill_reset:, \driver_draw_color_stroke_reset:}
% \begin{syntax}
% \cs{driver_draw_color_fill_reset:}
% \end{syntax}
% Resets the active color to that before a call to
% \cs{driver_draw_color_fill_\meta{model}:n(nnn)}. This function should be
% inserted after the \TeX{} group setting a color, \emph{i.e.}~normally
% \begin{verbatim}
% % Use of \driver_driver_color_fill_rgb:nnn, etc.
% \group_insert_after:N \driver_draw_color_fill_reset:
% \end{verbatim}
% \end{function}
%
% \subsection{Inserting \TeX{} material}
%
% \begin{function}{\driver_draw_hbox:Nnnnnnn}
% \begin{syntax}
% \cs{driver_draw_hbox:Nnnnnnn} \meta{box}
% \Arg{a} \Arg{b} \Arg{c} \Arg{d} \Arg{x} \Arg{y}
% \end{syntax}
% Inserts the \meta{box} as an hbox with the box reference point placed
% at ($x$, $y$). The transformation matrix $[a b c d]$ is applied
% to the box, allowing it to be in synchronisation with any scaling, rotation
% or skewing applying more generally. Note that \TeX{} material should not
% be inserted directly into a drawing as it would not be in the correct
% location. Also note that as for other drawing elements the box here
% has no size from a \TeX{} perspective.
% \end{function}
%
% \subsection{Coordinate system transformations}
%
% \begin{function}{\driver_draw_transformcm:nnnnnn}
% \begin{syntax}
% \cs{driver_draw_transformcm:nnnnnn} \Arg{a} \Arg{b} \Arg{c} \Arg{d}
% \Arg{x} \Arg{y}
% \end{syntax}
% Applies the transformation matrix $[a b c d]$ and offset vector
% ($x$, $y$) to the current graphic state. This affects any subsequent
% items in the same scope but not those already given.
% \end{function}
%
% \end{documentation}
%
% \begin{implementation}
%
% \section{\pkg{l3drivers} Implementation}
%
% \begin{macrocode}
%<*initex|package>
%<@@=driver>
% \end{macrocode}
%
% Whilst there is a reasonable amount of code overlap between drivers,
% it is much clearer to have the blocks more-or-less separated than run
% in together and DocStripped out in parts. As such, most of the following
% is set up on a per-driver basis, though there is some common code (again
% given in blocks not interspersed with other material).
%
% All the file identifiers are up-front so that they come out in the right
% place in the files.
% \begin{macrocode}
%<*package>
\ProvidesExplFile
%<*dvipdfmx>
{l3dvidpfmx.def}{2017/03/18}{}
{L3 Experimental driver: dvipdfmx}
%</dvipdfmx>
%<*dvips>
{l3dvips.def}{2017/03/18}{}
{L3 Experimental driver: dvips}
%</dvips>
%<*dvisvgm>
{l3dvisvgm.def}{2017/03/18}{}
{L3 Experimental driver: dvisvgm}
%</dvisvgm>
%<*pdfmode>
{l3pdfmode.def}{2017/03/18}{}
{L3 Experimental driver: PDF mode}
%</pdfmode>
%<*xdvipdfmx>
{l3xdvidpfmx.def}{2017/03/18}{}
{L3 Experimental driver: xdvipdfmx}
%</xdvipdfmx>
%</package>
% \end{macrocode}
%
% The order of the driver code here is such that we get somewhat logical
% outcomes in terms of code sharing whilst keeping things readable. (Trying to
% mix all of the code by concept is almost unmanageable.) The key parts which
% are shared are
% \begin{itemize}
% \item Color support is either \texttt{dvips}-like or \texttt{pdfmode}-like.
% \item \texttt{pdfmode} and \texttt{(x)dvipdfmx} share drawing routines.
% \item \texttt{xdvipdfmx} is largely the same as \texttt{dvipdfmx} so
% takes most of the same code.
% \end{itemize}
%
% \subsection{Color support}
%
% Color support is split into two parts: a \enquote{general} concept and
% one directly linked to drawings (or rather the split between filling
% and stroking). General color is relatively easy to handle: we have a color
% stack available with all modern drivers, and can use that.%
% Whilst \texttt{(x)dvipdfmx} does have its own approach to color specials,
% it is easier to use \texttt{dvips}-like ones for all cases except direct
% PDF output.
%
% \subsubsection{\texttt{dvips}-style}
%
% \begin{macrocode}
%<*dvisvgm|dvipdfmx|dvips|xdvipdfmx>
% \end{macrocode}
%
% \begin{macro}{\driver_color_pickup:N}
% \begin{macro}{\@@_color_pickup:w}
% Allow for \LaTeXe{} color. Here, the possible input values are limited:
% \texttt{dvips}-style colors can mainly be taken as-is with the exception
% spot ones (here we need a model and a tint).
% \begin{macrocode}
%<*package>
\cs_new_protected:Npn \driver_color_pickup:N #1 { }
\AtBeginDocument
{
\@ifpackageloaded { color }
{
\cs_set_protected:Npn \driver_color_pickup:N #1
{
\exp_args:NV \tl_if_head_is_space:nTF \current@color
{
\tl_set:Nx #1
{
spot ~
\exp_after:wN \use:n \current@color \c_space_tl 1
}
}
{ \exp_after:wN \@@_color_pickup:w \current@color \q_stop #1 }
}
\cs_new_protected:Npn \@@_color_pickup:w #1 ~ #2 \q_stop #3
{ \tl_set:Nn #3 { #1 ~ #2 } }
}
{ }
}
%</package>
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\driver_color_cmyk:nnnn}
% \begin{macro}{\driver_color_gray:n}
% \begin{macro}{\driver_color_rgb:nnn}
% \begin{macro}{\driver_color_spot:nn}
% \begin{macro}{\@@_color_select:n}
% \begin{macro}{\driver_color_reset:}
% Push the data to the stack. In the case of \texttt{dvips} also reset the
% drawing fill color in raw PostScript.
% \begin{macrocode}
\cs_new_protected:Npn \driver_color_cmyk:nnnn #1#2#3#4
{ \@@_color_select:n { cmyk~ #1 ~ #2 ~ #3 ~ #4 } }
\cs_new_protected:Npn \driver_color_gray:n #1
{ \@@_color_select:n { gray~ #1 } }
\cs_new_protected:Npn \driver_color_rgb:nnn #1#2#3
{ \@@_color_select:n { rgb~ #1 ~ #2 ~ #3 } }
\cs_new_protected:Npn \driver_color_spot:nn #1#2
{ \@@_color_select:n { \c_space_tl #1 } }
\cs_new_protected:Npn \@@_color_select:n #1
{
\tex_special:D { color~push~ #1 }
%<*dvips>
\tex_special:D { ps::/l3fc~{ }~def }
%</dvips>
}
\cs_new_protected:Npn \driver_color_reset:
{ \tex_special:D { color~pop } }
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macrocode}
%</dvisvgm|dvipdfmx|dvips|xdvipdfmx>
% \end{macrocode}
%
% \subsubsection{\texttt{pdfmode}}
%
% \begin{macrocode}
%<*pdfmode>
% \end{macrocode}
%
% \begin{macro}{\driver_color_pickup:N}
% \begin{macro}{\@@_color_pickup:w}
% The current color in driver-dependent format: pick up the package-mode
% data if available. We end up converting back and forward in this route as
% we store our color data in \texttt{dvips} format.
% The \tn{current@color} needs to be \texttt{x}-expanded before
% \cs{@@_color_pickup:w} breaks it apart, because for instance
% \pkg{xcolor} sets it to be instructions to generate a colour
% \begin{macrocode}
%<*package>
\cs_new_protected:Npn \driver_color_pickup:N #1 { }
\AtBeginDocument
{
\@ifpackageloaded { color }
{
\cs_set_protected:Npn \driver_color_pickup:N #1
{
\exp_last_unbraced:Nx \@@_color_pickup:w
{ \current@color } ~ 0 ~ 0 ~ 0 \q_stop #1
}
\cs_new_protected:Npn \@@_color_pickup:w
#1 ~ #2 ~ #3 ~ #4 ~ #5 ~ #6 \q_stop #7
{
\str_if_eq:nnTF {#2} { g }
{ \tl_set:Nn #7 { gray ~ #1 } }
{
\str_if_eq:nnTF {#4} { rg }
{ \tl_set:Nn #7 { rgb ~ #1 ~ #2 ~ #3 } }
{
\str_if_eq:nnTF {#5} { k }
{ \tl_set:Nn #7 { cmyk ~ #1 ~ #2 ~ #3 ~ #4 } }
{
\str_if_eq:nnTF {#2} { cs }
{
\tl_set:Nx #7 { spot ~ \use_none:n #1 ~ #5 }
}
{
\tl_set:Nn #7 { gray ~ 0 }
}
}
}
}
}
}
{ }
}
%</package>
% \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{variable}{\l_@@_color_stack_int}
% \pdfTeX{} and \LuaTeX{} have multiple stacks available, and to track
% which one is in use a variable is required.
% \begin{macrocode}
\int_new:N \l_@@_color_stack_int
% \end{macrocode}
% \end{variable}
%
% \begin{macro}{\driver_color_cmyk:nnnn}
% \begin{macro}{\driver_color_gray:n}
% \begin{macro}{\driver_color_rgb:nnn}
% \begin{macro}{\driver_color_spot:nn}
% \begin{macro}{\@@_color_select:n}
% \begin{macro}{\driver_color_reset:}
% Simply dump the data, but allowing for \LuaTeX{}.
% \begin{macrocode}
\cs_new_protected:Npn \driver_color_cmyk:nnnn #1#2#3#4
{ \@@_color_select:n { #1 ~ #2 ~ #3 ~ #4 ~ k ~ #1 ~ #2 ~ #3 ~ #4 ~ K } }
\cs_new_protected:Npn \driver_color_gray:n #1
{ \@@_color_select:n { #1 ~ g ~ #1 ~ G } }
\cs_new_protected:Npn \driver_color_rgb:nnn #1#2#3
{ \@@_color_select:n { #1 ~ #2 ~ #3 ~ rg ~ #1 ~ #2 ~ #3 ~ RG } }
\cs_new_protected:Npn \driver_color_spot:nn #1#2
{ \@@_color_select:n { /#1 ~ cs ~ /#1 ~ CS ~ #2 ~ sc ~ #2 ~ SC } }
\cs_new_protected:Npx \@@_color_select:n #1
{
\cs_if_exist:NTF \luatex_pdfextension:D
{ \luatex_pdfextension:D colorstack }
{ \pdftex_pdfcolorstack:D }
\exp_not:N \l_@@_color_stack_int push {#1}
}
\cs_new_protected:Npx \driver_color_reset:
{
\cs_if_exist:NTF \luatex_pdfextension:D
{ \luatex_pdfextension:D colorstack }
{ \pdftex_pdfcolorstack:D }
\exp_not:N \l_@@_color_stack_int pop \scan_stop:
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macrocode}
%</pdfmode>
% \end{macrocode}
%
% \subsection{\texttt{dvips} driver}
%
% \begin{macrocode}
%<*dvips>
% \end{macrocode}
%
% \subsubsection{Basics}
%
% \begin{macro}{\@@_literal:n}
% In the case of \texttt{dvips} there is no build-in saving of the current
% position, and so some additional PostScript is required to set up the
% transformation matrix and also to restore it afterwards. Notice the use
% of the stack to save the current position \enquote{up front} and to
% move back to it at the end of the process.
% \begin{macrocode}
\cs_new_protected:Npn \@@_literal:n #1
{
\tex_special:D
{
ps:
currentpoint~
currentpoint~translate~
#1 ~
neg~exch~neg~exch~translate
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_scope_begin:, \@@_scope_end:}
% Scope saving/restoring is done directly with no need to worry about the
% transformation matrix. General scoping is only for the graphics stack so
% the lower-cost |gsave|/|grestore| pair are used.
% \begin{macrocode}
\cs_new_protected:Npn \@@_scope_begin:
{ \tex_special:D { ps:gsave } }
\cs_new_protected:Npn \@@_scope_end:
{ \tex_special:D { ps:grestore } }
% \end{macrocode}
% \end{macro}
%
% \subsection{Driver-specific auxiliaries}
%
% \begin{macro}[EXP]{\@@_absolute_lengths:n}
% The \texttt{dvips} driver scales all absolute dimensions based
% on the output resolution selected and any \TeX{} magnification. Thus
% for any operation involving absolute lengths there is a correction to
% make. This is based on \texttt{normalscale} from \texttt{special.pro}
% but using the stack rather than a definition to save the current matrix.
% \begin{macrocode}
\cs_new:Npn \@@_absolute_lengths:n #1
{
matrix~currentmatrix~
Resolution~72~div~VResolution~72~div~scale~
DVImag~dup~scale~
#1 ~
setmatrix
}
% \end{macrocode}
% \end{macro}
%
% \subsubsection{Box operations}
%
% \begin{macro}{\driver_box_use_clip:N}
% Much the same idea as for the PDF mode version but with a slightly
% different syntax for creating the clip path. To avoid any scaling
% issues we need the absolute length auxiliary here.
% \begin{macrocode}
\cs_new_protected:Npn \driver_box_use_clip:N #1
{
\@@_scope_begin:
\@@_literal:n
{
\@@_absolute_lengths:n
{
0 ~
\dim_to_decimal_in_bp:n { \box_dp:N #1 } ~
\dim_to_decimal_in_bp:n { \box_wd:N #1 } ~
\dim_to_decimal_in_bp:n { -\box_ht:N #1 - \box_dp:N #1 } ~
rectclip
}
}
\hbox_overlap_right:n { \box_use:N #1 }
\@@_scope_end:
\skip_horizontal:n { \box_wd:N #1 }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\driver_box_use_rotate:Nn}
% Rotating using \texttt{dvips} does not require that the box dimensions
% are altered and has a very convenient built-in operation. Zero rotation
% must be written as |0| not |-0| so there is a quick test.
% \begin{macrocode}
\cs_new_protected:Npn \driver_box_use_rotate:Nn #1#2
{
\@@_scope_begin:
\@@_literal:n
{
\fp_compare:nNnTF {#2} = \c_zero_fp
{ 0 }
{ \fp_eval:n { round ( -#2 , 5 ) } } ~
rotate
}
\box_use:N #1
\@@_scope_end:
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\driver_box_use_scale:Nnn}
% The \texttt{dvips} driver once again has a dedicated operation we can
% use here.
% \begin{macrocode}
\cs_new_protected:Npn \driver_box_use_scale:Nnn #1#2#3
{
\@@_scope_begin:
\@@_literal:n
{
\fp_eval:n { round ( #2 , 5 ) } ~
\fp_eval:n { round ( #3 , 5 ) } ~
scale
}
\hbox_overlap_right:n { \box_use:N #1 }
\@@_scope_end:
}
% \end{macrocode}
% \end{macro}
%
% \subsection{Images}
%
% \begin{macro}{\@@_image_getbb_eps:n}
% Simply use the generic function.
% \begin{macrocode}
\cs_new_eq:NN \@@_image_getbb_eps:n \image_read_bb:n
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\@@_image_include_eps:n}
% The special syntax is relatively clear here: remember we need PostScript
% sizes here.
% \begin{macrocode}
\cs_new_protected:Npn \@@_image_include_eps:n #1
{
\tex_special:D { PSfile = #1 }
}
% \end{macrocode}
% \end{macro}
%
% \subsection{Drawing}
%
% \begin{macro}{\@@_draw_literal:n, \@@_draw_literal:x}
% Literals with no positioning (using |ps:| each one is positioned but
% cut off from everything else, so no good for the stepwise approach needed
% here).
% \begin{macrocode}
\cs_new_protected:Npn \@@_draw_literal:n #1
{ \tex_special:D { ps:: ~ #1 } }
\cs_generate_variant:Nn \@@_draw_literal:n { x }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\driver_draw_begin:, \driver_draw_end:}
% The |ps::[begin]| special here deals with positioning but allows us to
% continue on to a matching |ps::[end]|: contrast with |ps:|, which positions
% but where we can't split material between separate calls. The
% |@beginspecial|/|@endspecial| pair are from |special.pro| and correct the
% scale and $y$-axis direction. The reference point at the start of the box
% is saved (as |l3x|/|l3y|) as it is needed when inserting various items.
% \begin{macrocode}
\cs_new_protected:Npn \driver_draw_begin:
{
\@@_draw_literal:n { [begin] }
\@@_draw_literal:n { save }
\@@_draw_literal:n { /l3x~currentpoint~/l3y~exch~def~def }
\@@_draw_literal:n { @beginspecial }
\@@_draw_literal:n { /l3fc~{ }~def }
}
\cs_new_protected:Npn \driver_draw_end:
{
\@@_draw_literal:n { @endspecial }
\@@_draw_literal:n { restore }
\@@_draw_literal:n { [end] }
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\driver_draw_scope_begin:, \driver_draw_scope_end:}
% Scope here may need to contain saved definitions, so the entire memory
% rather than just the graphic state has to be sent to the stack.
% \begin{macrocode}
\cs_new_protected:Npn \driver_draw_scope_begin:
{ \@@_draw_literal:n { save } }
\cs_new_protected:Npn \driver_draw_scope_end:
{ \@@_draw_literal:n { restore } }
% \end{macrocode}
% \end{macro}
%
% \begin{macro}{\driver_draw_moveto:nn, \driver_draw_lineto:nn}
% \begin{macro}{\driver_draw_rectangle:nnnn}
% \begin{macro}{\driver_draw_curveto:nnnnnn}
% Path creation operations mainly resolve directly to PostScript primitive
% steps, with only the need to convert to \texttt{bp}. Notice that
% \texttt{x}-type expansion is included here to ensure that any variable
% values are forced to literals before any possible caching. There is
% no native rectangular path command (without also clipping, filling or
% stroking), so that task is done using a small amount of PostScript.
% \begin{macrocode}
\cs_new_protected:Npn \driver_draw_moveto:nn #1#2
{
\@@_draw_literal:x
{ \dim_to_decimal_in_bp:n {#1} ~ \dim_to_decimal_in_bp:n {#2} ~ moveto }
}
\cs_new_protected:Npn \driver_draw_lineto:nn #1#2
{
\@@_draw_literal:x
{ \dim_to_decimal_in_bp:n {#1} ~ \dim_to_decimal_in_bp:n {#2} ~ lineto }
}
\cs_new_protected:Npn \driver_draw_rectangle:nnnn #1#2#3#4
{
\@@_draw_literal:x
{
\dim_to_decimal_in_bp:n {#4} ~ \dim_to_decimal_in_bp:n {#3} ~
\dim_to_decimal_in_bp:n {#1} ~ \dim_to_decimal_in_bp:n {#2} ~
moveto~dup~0~rlineto~exch~0~exch~rlineto~neg~0~rlineto~closepath
}
}
\cs_new_protected:Npn \driver_draw_curveto:nnnnnn #1#2#3#4#5#6
{
\@@_draw_literal:x
{
\dim_to_decimal_in_bp:n {#1} ~ \dim_to_decimal_in_bp:n {#2} ~
\dim_to_decimal_in_bp:n {#3} ~ \dim_to_decimal_in_bp:n {#4} ~
\dim_to_decimal_in_bp:n {#5} ~ \dim_to_decimal_in_bp:n {#6} ~
curveto
}
}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\driver_draw_evenodd_rule:, \driver_draw_nonzero_rule:}
% \begin{variable}{\g_@@_draw_eor_bool}
% The even-odd rule here can be implemented as a simply switch.
% \begin{macrocode}
\cs_new_protected:Npn \driver_draw_evenodd_rule:
{ \bool_gset_true:N \g_@@_draw_eor_bool }
\cs_new_protected:Npn \driver_draw_nonzero_rule:
{ \bool_gset_false:N \g_@@_draw_eor_bool }
\bool_new:N \g_@@_draw_eor_bool
% \end{macrocode}
% \end{variable}
% \end{macro}
%
% \begin{macro}
% {
% \driver_draw_closepath: ,
% \driver_draw_stroke: ,
% \driver_draw_closestroke: ,
% \driver_draw_fill: ,
% \driver_draw_fillstroke: ,
% \driver_draw_clip: ,
% \driver_draw_discardpath:
% }
% \begin{variable}{\g_@@_draw_clip_bool}