FloatRect FilterEffect::determineAbsolutePaintRect(const FloatRect& originalRequestedRect)
{
FloatRect requestedRect = originalRequestedRect;
// Filters in SVG clip to primitive subregion, while CSS doesn't.
if (m_clipsToBounds)
requestedRect.intersect(maxEffectRect());
// We may be called multiple times if result is used more than once. Return
// quickly if if nothing new is required.
if (absolutePaintRect().contains(enclosingIntRect(requestedRect)))
return requestedRect;
FloatRect inputRect = mapPaintRect(requestedRect, false);
FloatRect inputUnion;
unsigned size = m_inputEffects.size();
for (unsigned i = 0; i < size; ++i)
inputUnion.unite(m_inputEffects.at(i)->determineAbsolutePaintRect(inputRect));
inputUnion = mapPaintRect(inputUnion, true);
if (affectsTransparentPixels() || !size) {
inputUnion = requestedRect;
} else {
// Rect may have inflated. Re-intersect with request.
inputUnion.intersect(requestedRect);
}
addAbsolutePaintRect(inputUnion);
return inputUnion;
}
FloatRect FEDisplacementMap::determineAbsolutePaintRect(const FloatRect& requestedRect)
{
FloatRect rect = requestedRect;
if (clipsToBounds())
rect.intersect(maxEffectRect());
if (absolutePaintRect().contains(enclosingIntRect(rect)))
return rect;
rect = mapPaintRect(rect, false);
rect = inputEffect(0)->determineAbsolutePaintRect(rect);
rect = mapPaintRect(rect, true);
rect.intersect(requestedRect);
addAbsolutePaintRect(rect);
return rect;
}