GetCombinedClippingRegion
fDrawState->GetCombinedClippingRegion(&fCurrentDrawingRegion);
&& fPreviousState->GetCombinedClippingRegion(region)) {
return fPreviousState->GetCombinedClippingRegion(region);
bool GetCombinedClippingRegion(BRegion* region) const;
bool hasDrawStateClipping = fDrawState->GetCombinedClippingRegion(
fDrawState->GetCombinedClippingRegion(fUserClipping.Get());