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kwin: Fix the blend function in the lanczos filter

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The alpha values are pre-multiplied.
This commit is contained in:
Fredrik Höglund 2013-03-21 16:31:06 +01:00
parent e59867dd92
commit 2cec03dede
1 changed files with 2 additions and 2 deletions
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4
lanczosfilter.cpp
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@ -208,7 +208,7 @@ void LanczosFilter::performPaint(EffectWindowImpl* w, int mask, QRegion region,
} }
if (effects->compositingType() == OpenGL2Compositing) { if (effects->compositingType() == OpenGL2Compositing) {
glEnable(GL_BLEND); glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
const qreal rgb = data.brightness() * data.opacity(); const qreal rgb = data.brightness() * data.opacity();
const qreal a = data.opacity(); const qreal a = data.opacity();
@ -344,7 +344,7 @@ void LanczosFilter::performPaint(EffectWindowImpl* w, int mask, QRegion region,
} }
if (effects->compositingType() == OpenGL2Compositing) { if (effects->compositingType() == OpenGL2Compositing) {
glEnable(GL_BLEND); glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
const qreal rgb = data.brightness() * data.opacity(); const qreal rgb = data.brightness() * data.opacity();
const qreal a = data.opacity(); const qreal a = data.opacity();