Review Request 112883: Workaround for flickering in OpenGL 2 canvas on AMD graphic cards

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This review has been submitted with commit 402b384ca24395130092c573bcd27e7b5d1f7534 by Boudewijn Rempt to branch master.

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On Sept. 22, 2013, 1:18 p.m., Sven Langkamp wrote:
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> http://git.reviewboard.kde.org/r/112883/
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> (Updated Sept. 22, 2013, 1:18 p.m.)
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> Review request for Calligra and Boudewijn Rempt.
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> Description
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> On AMD graphic cards the Krita OpengGL 2 branch shows some flickering. The problem happens when only a part of the widget is updated e.g. when switching between menu.
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> The patch solves that by dropping paint events that update that have an update rect smaller than the size of the widget. In that case a new update with the full size of the widget is trigger.
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> It's somewhat of an ugly hack, but it's the best solution that I could find. Better suggestions appreciated.
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> This addresses bug 322808.
>     http://bugs.kde.org/show_bug.cgi?id=322808
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> Diffs
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>   krita/ui/opengl/kis_opengl_canvas2.h 5d701d6 
>   krita/ui/opengl/kis_opengl_canvas2.cpp 2ddd503 
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> Diff: http://git.reviewboard.kde.org/r/112883/diff/
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> Testing
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> Tested on my ATI card. Flickering is gone.
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> Thanks,
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> Sven Langkamp
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