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Write doxygen documentation for: * PagePainter::paintPageOnPainter(), paintCroppedPageOnPainter() * `Change Colors` algorithm functions of PagePainter * PagePainter::drawShapeOnImage(), drawPixmapOnImage(); very straightforward, but added a note on the coordinate system. * LineAnnotPainter constructor, draw() Remove unused functions: * PagePainter::cropPixmapOnImage(), QPixmap::copy() can do it easily today.
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