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% Copyright 2018 by Till Tantau
%
% This file may be distributed and/or modified
%
% 1. under the LaTeX Project Public License and/or
% 2. under the GNU Public License.
%
% See the file doc/generic/pgf/licenses/LICENSE for more details.
\ProvidesFileRCS{pgfcoreimage.code.tex}
% Declare an image
%
% #1 = optional argument: width, height, page specification
% #2 = name of the image for later use
% #4 = filename without extension, automatic extensions are .pdf,
% .jpg, and .png for PDF and .ps, .eps, .epsi for postscript.
%
% Description:
%
% This command declares an image file for later use. Even if the image
% is used several times in the document, in PDF it will only be stored
% once.
%
% Example:
%
% \pgfdeclareimage[width=2cm,page=2]{myimage}{imagefilename}
\def\pgfdeclareimage{\pgfutil@ifnextchar[{\pgf@declareimage}{\pgf@declareimage[]}}
\def\pgf@declareimage[#1]#2#3{%
\pgfqkeys{/pgf/images}{height=,width=,page=,interpolate=false,mask=,#1}%
% Try to find the file
\gdef\pgf@filename{}%
% If page= parameter is not empty, try that file first:
\ifx\pgf@imagepage\pgfutil@empty%
\else%
\expandafter\pgf@findfile\pgfsys@imagesuffixlist:+{#3.page\pgf@imagepage}%
\fi%
\ifx\pgf@filename\pgfutil@empty%
\expandafter\pgf@findfile\pgfsys@imagesuffixlist:+{#3}%
\else%
\pgfkeys{/pgf/images/page=}% make page empty
\fi%
\ifx\pgf@filename\pgfutil@empty%
\pgfwarning%
{File "#3" not found when defining image "#2".
Tried all extensions in "\pgfsys@imagesuffixlist"}%
\pgf@declaredraftimage{#2}{#3}%
\else%
\ifpgf@draftmode%
\pgf@declaredraftimage{#2}{#3}%
\else%
\pgfsys@defineimage%
\fi%
\fi%
\expandafter\global\expandafter\let\csname pgf@image@#2!\endcsname=\pgf@image%
}
\pgfkeys{
/pgf/images/draft/.is if=pgf@draftmode,
/pgf/images/draft/.default=true}
\pgfkeys{/pgf/images/width/.estore in=\pgf@imagewidth}
\pgfkeys{/pgf/images/height/.estore in=\pgf@imageheight}
\pgfkeys{/pgf/images/page/.estore in=\pgf@imagepage}
\pgfkeys{/pgf/images/interpolate/.cd,.code=\edef\pgf@imageinterpolate{#1},.default=true}
\let\pgf@imageinterpolate\pgfutil@empty
\pgfkeys{/pgf/images/mask/.code=%
{%
\edef\pgf@imagemask{#1}%
\ifx\pgf@imagemask\pgfutil@empty%
\else%
\pgfutil@ifundefined{pgf@mask@#1}%
{\pgferror{Undefined mask "#1".}%
\edef\pgf@imagemask{}}%
{\edef\pgf@imagemask{\csname pgf@mask@#1\endcsname}%
}%
\fi%
}}
\def\pgf@findfile#1:#2+#3{%
\pgfutil@IfFileExists{#3#1}%
{\xdef\pgf@filename{#3#1}}%
{\def\pgf@mightbeempty{#2}%
\ifx\pgf@mightbeempty\pgfutil@empty\else%
\pgf@findfile#2+{#3}%
\fi}}
% #1: image name
% #2: file name
\def\pgf@declaredraftimage#1#2{%
\ifx\pgf@imagewidth\pgfutil@empty%
\pgfwarning{Missing width for image "#1" ("#2") in draft mode. Using 1cm instead}%
\edef\pgf@imagewidth{1cm}%
\fi%
\ifx\pgf@imageheight\pgfutil@empty%
\pgfwarning{Missing height for image "#1" ("#2") in draft mode. Using 1cm instead}%
\edef\pgf@imageheight{1cm}%
\fi%
\ifx\pgf@imagepage\pgfutil@empty\else\edef\pgf@imagepagetext{ page \pgf@imagepage}\fi%
\edef\pgf@image{%
\hbox to \pgf@imagewidth{%
\vrule\kern-0.4pt%
\vbox to \pgf@imageheight{%
\hrule\vfil%
\hbox to \pgf@imagewidth{\hskip-10cm\hfil\noexpand\pgfutil@font@tiny#2\pgf@imagepage\hfil\hskip-10cm}%
\vfil\hrule}%
\kern-0.4pt\vrule}%
}%
}
% Declare a soft mask
%
% #1 = optional argument: matte specification. default matte is
% white.
% #2 = name of the mask for later use
% #3 = filename without extension, automatic extensions are .pdf,
% .jpg, and .png for PDF. Postscript is not supported.
%
% Description:
%
% This command declares a soft mask for later masking an image. The
% declared mask should be used together with an image of exactly the
% same height/width if matte is defined. Matte should be the
% preblended background color (see pdf spec for details).
%
% Example:
%
% \pgfdeclaremask[matte=white]{maskname}{maskfilename}
% \pgfdeclareimage[mask=maskname]{image}{imagefilename}
\def\pgfdeclaremask{\pgfutil@ifnextchar[\pgf@declaremask{\pgf@declaremask[]}}
\def\pgf@declaremask[#1]#2#3{%
\pgfqkeys{/pgf/images/mask}{matte={1 1 1},#1}% defaults
\def\pgf@mask{}%
% Try to find the file
\gdef\pgf@filename{}%
\expandafter\pgf@findfile\pgfsys@imagesuffixlist:+{#3}%
\ifx\pgf@filename\pgfutil@empty%
\pgfwarning%
{File "#3" not found when defining mask "#2".
Tried all extensions in "\pgfsys@imagesuffixlist"}%
\else%
\pgfsys@definemask%
\fi%
\expandafter\global\expandafter\let\csname pgf@mask@#2\endcsname=\pgf@mask%
}
\pgfkeys{/pgf/images/mask/matte/.cd,.estore in=\pgf@maskmatte,.value required}
% Create an alias name for an image
%
% #1 = name of the alias
% #2 = name of the original
%
% Example:
%
% \pgfdeclareimage{image}{1cm}{1cm}{filename
% \pgfaliasimage{alias}{image}
% \pgfuseimage{alias}
\def\pgfaliasimage#1#2{%
\expandafter\global\expandafter\let\expandafter\pgf@temp\expandafter=\csname pgf@image@#2!\endcsname%
\expandafter\global\expandafter\let\csname pgf@image@#1!\endcsname=\pgf@temp%
}
% Use an image
%
% #1 = name of a previously declared image
%
% Example:
%
% \pgfputat{\pgforigin}{\pgfbox[left,base]{\pgfuseimage{myimage}}}
\def\pgfuseimage#1{%
\def\pgf@imagename{pgf@image@#1}%
\pgf@tryextensions{\pgf@imagename}{\pgfalternateextension}%
\expandafter\pgfutil@ifundefined\expandafter{\pgf@imagename}%
{\pgferror{Undefined image "#1"}}%
{{\leavevmode\csname\pgf@imagename\endcsname}}}
\def\pgf@tryextensions#1#2{%
\edef\pgf@args{[#2!]}\expandafter\pgf@@tryextensions\pgf@args{#1}}
\def\pgf@@tryextensions[#1!#2]#3{%
\expandafter\pgfutil@ifundefined\expandafter{#3#1!#2}%
{\def\pgf@temp{#2}%
\ifx\pgf@temp\pgfutil@empty%
\edef#3{#3!}%
\else%
\pgf@@tryextensions[#2]{#3}%
\fi}%
{\edef#3{#3#1!#2}}}
% Alternate image
%
% Description:
%
% When an image is used, pgf first attempts to use the image with the
% alternate extension added. If this fails, the original image is
% used. If the alternate extension contains ``!'', then the text up to
% the ! is successively removed and the remainder is tried as an
% alternate extension.
%
% Example:
%
% \def\pgfalternateextension{20!white}
\def\pgfalternateextension{}
% Directly insert an image
%
% #1 = optional argument: width, height, page specification
% #2 = file name
%
% Description:
%
% Directly inserts an image without declaration. You can, however,
% still access this image using the name pgflastimage. By using
% pgfaliasimage, you can also save this image for later.
%
% Example:
%
% \pgfimage[height=2cm]{filename}
\def\pgfimage{\pgfutil@ifnextchar[\pgf@imagecom{\pgf@imagecom[]}}
\def\pgf@imagecom[#1]#2{%
\pgfdeclareimage[#1]{pgflastimage}{#2}%
\pgfuseimage{pgflastimage}}
\input pgfcoreexternal.code.tex
\endinput
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