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124 lines
4.8 KiB
TeX
124 lines
4.8 KiB
TeX
%% GRAPHICS
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%
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% change this info string if making any custom modification
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\ProvidesPackage{sphinxlatexgraphics}[2024/08/13 v8.1.0 graphics]
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% Provides support for this output mark-up from Sphinx latex writer:
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%
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% - macros:
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%
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% - \sphinxfigcaption
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% - \sphinxincludegraphics
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%
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% - environments:
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%
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% - sphinxfigure-in-table
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%
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% May change:
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%
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% - \sphinxcaption (at begin document)
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%
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% Also provides:
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%
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% - \sphinxsafeincludegraphics (default of \sphinxincludegraphics since 2.0)
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% - \spx@image@maxheight dimension (used by sphinxlatexadmonitions.sty)
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% - \spx@image@box scratch box register (also used by sphinxlatexliterals.sty)
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%
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% Requires:
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% \RequirePackage{graphicx}% done in sphinx.sty
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\RequirePackage{amstext}% needed for \firstchoice@true(false)
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% \sphinxincludegraphics resizes images larger than the TeX \linewidth (which
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% is adjusted in indented environments), or taller than a certain maximal
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% height (usually \textheight and this is reduced in the environments which use
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% framed.sty to avoid infinite loop if image too tall).
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%
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% In case height or width options are present the rescaling is done
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% (since 2.0), in a way keeping the width:height ratio either native from
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% image or from the width and height options if both were present.
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%
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\newdimen\spx@image@maxheight
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\AtBeginDocument{\spx@image@maxheight\textheight}
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% box scratch register
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\newbox\spx@image@box
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\newcommand*{\sphinxsafeincludegraphics}[2][]{%
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% #1 contains possibly width=, height=, but no scale= since 1.8.4
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\setbox\spx@image@box\hbox{\includegraphics[#1,draft]{#2}}%
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\in@false % use some handy boolean flag
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\ifdim \wd\spx@image@box>\linewidth
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\in@true % flag to remember to adjust options and set box dimensions
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% compute height which results from rescaling width to \linewidth
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% and keep current aspect ratio. multiply-divide in \numexpr uses
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% temporarily doubled precision, hence no overflow. (of course we
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% assume \ht is not a few sp's below \maxdimen...(about 16384pt).
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\edef\spx@image@rescaledheight % with sp units
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{\the\numexpr\ht\spx@image@box
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*\linewidth/\wd\spx@image@box sp}%
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\ifdim\spx@image@rescaledheight>\spx@image@maxheight
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% the rescaled height will be too big, so it is height which decides
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% the rescaling factor
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\def\spx@image@requiredheight{\spx@image@maxheight}% dimen register
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\edef\spx@image@requiredwidth % with sp units
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{\the\numexpr\wd\spx@image@box
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*\spx@image@maxheight/\ht\spx@image@box sp}%
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% TODO: decide if this commented-out block could be needed due to
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% rounding in numexpr operations going up
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% \ifdim\spx@image@requiredwidth>\linewidth
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% \def\spx@image@requiredwidth{\linewidth}% dimen register
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% \fi
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\else
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\def\spx@image@requiredwidth{\linewidth}% dimen register
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\let\spx@image@requiredheight\spx@image@rescaledheight% sp units
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\fi
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\else
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% width is ok, let's check height
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\ifdim\ht\spx@image@box>\spx@image@maxheight
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\in@true
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\edef\spx@image@requiredwidth % with sp units
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{\the\numexpr\wd\spx@image@box
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*\spx@image@maxheight/\ht\spx@image@box sp}%
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\def\spx@image@requiredheight{\spx@image@maxheight}% dimen register
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\fi
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\fi % end of check of width and height
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\ifin@
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\setbox\spx@image@box
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\hbox{\includegraphics
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[#1,% contains only width and/or height which are overruled next
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% but in future may contain page=N hence must be kept
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width=\spx@image@requiredwidth,height=\spx@image@requiredheight]%
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{#2}}%
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% \includegraphics does not set box dimensions to the exactly
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% requested ones, see https://github.com/latex3/latex2e/issues/112
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\wd\spx@image@box\spx@image@requiredwidth
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\ht\spx@image@box\spx@image@requiredheight
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\leavevmode\box\spx@image@box
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\else
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% here we do not modify the options, no need to adjust width and height
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% on output, they will be computed exactly as with "draft" option
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\setbox\spx@image@box\box\voidb@x % clear memory
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\includegraphics[#1]{#2}%
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\fi
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}%
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% Use the "safe" one by default (2.0)
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\def\sphinxincludegraphics{\sphinxsafeincludegraphics}
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%% FIGURE IN TABLE
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%
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\newenvironment{sphinxfigure-in-table}[1][\linewidth]{%
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\def\@captype{figure}%
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\sphinxsetvskipsforfigintablecaption
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\begin{minipage}{#1}%
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}{\end{minipage}}
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% tabulary expands twice contents, we need to prevent double counter stepping
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\newcommand*\sphinxfigcaption
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{\ifx\equation$%$% this is trick to identify tabulary first pass
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\firstchoice@false\else\firstchoice@true\fi
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\spx@originalcaption }
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\newcommand*\sphinxsetvskipsforfigintablecaption
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{\abovecaptionskip\smallskipamount
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\belowcaptionskip\smallskipamount}
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\endinput
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