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b=573409 expire unused cached double-buffering back surfaces r=vlad sr=roc

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This commit is contained in:
Karl Tomlinson
2010-07-16 09:08:09 +12:00
parent 41226b8778
commit ded97ce3f3
5 changed files with 239 additions and 30 deletions
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34
gfx/layers/basic/BasicLayers.cpp
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@@ -750,32 +750,10 @@ BasicLayerManager::PushGroupWithCachedSurface(gfxContext *aTarget,
gfxRect clip = aTarget->GetClipExtents();
clip.RoundOut();
if (mCachedSurface) {
/* Verify the current buffer is valid for this purpose */
if (mCachedSurface->GetContentType() != aContent) {
mCachedSurface = nsnull;
} else {
/* bufferClip should always be {0,0,width,height} of the buffer surface */
if (clip.size.width > mCachedSurfaceSize.width ||
clip.size.height > mCachedSurfaceSize.height) {
mCachedSurface = nsnull;
}
}
}
nsRefPtr<gfxContext> ctx;
if (mCachedSurface) {
ctx = new gfxContext(mCachedSurface);
ctx->SetOperator(gfxContext::OPERATOR_CLEAR);
ctx->Paint();
ctx->SetOperator(gfxContext::OPERATOR_OVER);
} else {
mCachedSurfaceSize = gfxIntSize(clip.size.width, clip.size.height);
mCachedSurface = currentSurf->CreateSimilarSurface(aContent,
mCachedSurfaceSize);
if (!mCachedSurface)
return nsnull;
ctx = new gfxContext(mCachedSurface);
}
nsRefPtr<gfxContext> ctx =
mCachedSurface.Get(aContent,
gfxIntSize(clip.size.width, clip.size.height),
currentSurf);
/* Align our buffer for the original surface */
ctx->Translate(-clip.pos);
*aSavedOffset = clip.pos;
@@ -787,13 +765,13 @@ void
BasicLayerManager::PopGroupWithCachedSurface(gfxContext *aTarget,
const gfxPoint& aSavedOffset)
{
if (!mCachedSurface)
if (!mTarget)
return;
gfxContextMatrixAutoSaveRestore saveMatrix(aTarget);
aTarget->IdentityMatrix();
aTarget->SetSource(mCachedSurface, aSavedOffset);
aTarget->SetSource(mTarget->OriginalSurface(), aSavedOffset);
aTarget->Paint();
}