static void
AddTransformedRegion(nsIntRegion& aDest, const nsIntRegion& aSource, const Matrix4x4& aTransform)
{
nsIntRegionRectIterator iter(aSource);
const IntRect *r;
while ((r = iter.Next())) {
aDest.Or(aDest, TransformRect(*r, aTransform));
}
aDest.SimplifyOutward(20);
}
static void
AddRegion(nsIntRegion& aDest, const nsIntRegion& aSource)
{
aDest.Or(aDest, aSource);
aDest.SimplifyOutward(20);
}