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Lukáš Tvrdý authored
Use QImage as buffer for QPainter based canvas. Not the whole image is painted, just changed rect. Now tools can use composite modes to paint their overlays. This is possible fix for tool overlay and will be tested. If you encounter performence problems, let me know. This can be turned off safely by commenting line 24 in header file. svn path=/trunk/koffice/; revision=1022148
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