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Bug 1202317. Bail out early if RequestRect is going to do redundant work. r=mstange

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This commit is contained in:
Robert O'Callahan 2015-09-07 17:08:36 +12:00
parent 6b7b9e651a
commit 942b0aae4e
1 changed files with 6 additions and 0 deletions
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6
gfx/2d/FilterNodeSoftware.cpp
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@ -629,6 +629,12 @@ FilterNodeSoftware::GetOutput(const IntRect &aRect)
void
FilterNodeSoftware::RequestRect(const IntRect &aRect)
{
if (mRequestedRect.Contains(aRect)) {
// Bail out now. Otherwise pathological filters can spend time exponential
// in the number of primitives, e.g. if each primitive takes the
// previous primitive as its two inputs.
return;
}
mRequestedRect = mRequestedRect.Union(aRect);
RequestFromInputsForRect(aRect);
}