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kwin/blur: use already existing texture instead of allocating a new one

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This commit is contained in:
Philipp Knechtges 2012-01-08 17:23:36 +01:00
parent 08835ffd31
commit c8fbb4ec61
1 changed files with 7 additions and 10 deletions
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17
effects/blur/blur.cpp
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@ -528,12 +528,9 @@ void BlurEffect::doCachedBlur(EffectWindow *w, const QRegion& region, const floa
if (!updateBackground.isEmpty()) {
const QRect updateRect = (expand(updateBackground) & expanded).boundingRect();
// Create a scratch texture and copy the area in the back buffer that we're
// going to blur into it
GLTexture scratch(updateRect.width(), updateRect.height());
scratch.setFilter(GL_LINEAR);
scratch.setWrapMode(GL_CLAMP_TO_EDGE);
scratch.bind();
// First we have to copy the background from the frontbuffer
// into a scratch texture (in this case "tex").
tex.bind();
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, updateRect.x(), displayHeight() - updateRect.y() - updateRect.height(),
updateRect.width(), updateRect.height());
@ -543,7 +540,7 @@ void BlurEffect::doCachedBlur(EffectWindow *w, const QRegion& region, const floa
GLRenderTarget::pushRenderTarget(target);
shader->setDirection(Qt::Horizontal);
shader->setPixelDistance(1.0 / updateRect.width());
shader->setPixelDistance(1.0 / tex.width());
modelViewProjectionMatrix.ortho(0, r.width(), r.height(), 0 , 0, 65535);
modelViewProjectionMatrix.translate(-r.x(), -r.y(), 0);
@ -552,8 +549,8 @@ void BlurEffect::doCachedBlur(EffectWindow *w, const QRegion& region, const floa
// Set up the texture matrix to transform from screen coordinates
// to texture coordinates.
textureMatrix.scale(1.0 / scratch.width(), -1.0 / scratch.height(), 1);
textureMatrix.translate(-updateRect.x(), -scratch.height() - updateRect.y(), 0);
textureMatrix.scale(1.0 / tex.width(), -1.0 / tex.height(), 1);
textureMatrix.translate(-updateRect.x(), -updateRect.height() - updateRect.y(), 0);
#ifndef KWIN_HAVE_OPENGLES
glMatrixMode(GL_TEXTURE);
loadMatrix(textureMatrix);
@ -564,7 +561,7 @@ void BlurEffect::doCachedBlur(EffectWindow *w, const QRegion& region, const floa
drawRegion(updateBackground & screen);
GLRenderTarget::popRenderTarget();
scratch.unbind();
tex.unbind();
// mark the updated region as valid
windows[w].damagedRegion -= updateBackground;
}