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%D \module
%D [ file=back-trf,
%D version=2019.02.08, % 2009.04.15,
%D title=\CONTEXT\ Backend Macros,
%D subtitle=Transformations,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\unprotect
\registerctxluafile{back-trf}{}
% rotation
\unexpanded\def\dostartrotation#1%
{\forcecolorhack
\clf_startrotation#1\relax} % todo: implement without Q q
\unexpanded\def\dostoprotation
{\clf_stoprotation
\forcecolorhack}
% scaling
\unexpanded\def\dostartscaling#1#2%
{\forcecolorhack
\clf_startscaling rx #1 ry #2\relax}
\unexpanded\def\dostopscaling
{\clf_stopscaling
\forcecolorhack}
% mirroring
\unexpanded\def\dostartmirroring
{\clf_startmirroring}
\unexpanded\def\dostopmirroring
{\clf_stopmirroring}
% transform
\unexpanded\def\dotransformnextbox#1#2#3#4#5#6%
{\dowithnextbox{\dodotransformnextbox{#1}{#2}{#3}{#4}{#5}{#6}}}
\unexpanded\def\dodotransformnextbox#1#2#3#4#5#6%
{\hpack
{\kern #5\onebasepoint
\raise#6\onebasepoint
\hpack
{\clf_startmatrix rx #1 sx #2 sy #3 ry #4\relax
\box\nextbox
\clf_stopmatrix}}}
%D \macros
%D {dostartclipping,dostopclipping}
%D
%D Clipping is implemented in such a way that an arbitrary code can be fed.
%D
%D \starttyping
%D \dostartclipping {pathname} {width} {height}
%D \dostopclipping
%D \stoptyping
\unexpanded\def\dostartclipping#1#2#3% we can move this to lua and only set a box here
{\forcecolorhack
\meta_grab_clip_path{#1}{#2}{#3}%
\clf_startclipping{\MPclippath}%
\glet\MPclippath\empty}
\unexpanded\def\dostopclipping
{\clf_stopclipping}
\protect \endinput
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