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List:       kwin
Subject:    [Bug 163054] wrong rendering by using OpenGL
From:       Rivo Laks <rivolaks () hot ! ee>
Date:       2008-06-25 17:10:30
Message-ID: 20080625171030.6350.qmail () ktown ! kde ! org
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http://bugs.kde.org/show_bug.cgi?id=163054         




------- Additional Comments From rivolaks hot ee  2008-06-25 19:10 -------
For OpenGL, the correct formula is definitely the first one in comment #8.
But the second formula might be correct as well :-)
XRender probably uses premultiplied pixmaps for blending, in which case the second \
formula is correct for XRender: it just assumes that Fg has already been multiplied \
by opacity. So in the end the two formulas are actually equal, just that in XRender's \
case, Opacity * Fg has been optimized. \
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