void TextureMapperLayer::computeOverlapRegions(Region& overlapRegion, Region& nonOverlapRegion, ResolveSelfOverlapMode mode) { if (!m_state.visible || !m_state.contentsVisible) return; FloatRect boundingRect; if (m_backingStore || m_state.masksToBounds || m_state.maskLayer || hasFilters()) boundingRect = layerRect(); else if (m_contentsLayer || m_state.solidColor.alpha()) boundingRect = m_state.contentsRect; #if ENABLE(CSS_FILTERS) if (m_currentFilters.hasOutsets()) { FilterOutsets outsets = m_currentFilters.outsets(); IntRect unfilteredTargetRect(boundingRect); boundingRect.move(std::max(0, -outsets.left()), std::max(0, -outsets.top())); boundingRect.expand(outsets.left() + outsets.right(), outsets.top() + outsets.bottom()); boundingRect.unite(unfilteredTargetRect); } #endif TransformationMatrix replicaMatrix; if (m_state.replicaLayer) { replicaMatrix = replicaTransform(); boundingRect.unite(replicaMatrix.mapRect(boundingRect)); } boundingRect = m_currentTransform.combined().mapRect(boundingRect); // Count all masks and filters as overlap layers. if (hasFilters() || m_state.maskLayer || (m_state.replicaLayer && m_state.replicaLayer->m_state.maskLayer)) { Region newOverlapRegion(enclosingIntRect(boundingRect)); nonOverlapRegion.subtract(newOverlapRegion); overlapRegion.unite(newOverlapRegion); return; } Region newOverlapRegion; Region newNonOverlapRegion(enclosingIntRect(boundingRect)); if (!m_state.masksToBounds) { for (size_t i = 0; i < m_children.size(); ++i) { TextureMapperLayer* child = m_children[i]; child->computeOverlapRegions(newOverlapRegion, newNonOverlapRegion, ResolveSelfOverlapIfNeeded); } } if (m_state.replicaLayer) { newOverlapRegion.unite(replicaMatrix.mapRect(newOverlapRegion.bounds())); Region replicaRegion(replicaMatrix.mapRect(newNonOverlapRegion.bounds())); resolveOverlaps(replicaRegion, newOverlapRegion, newNonOverlapRegion); } if ((mode != ResolveSelfOverlapAlways) && shouldBlend()) { newNonOverlapRegion.unite(newOverlapRegion); newOverlapRegion = Region(); } overlapRegion.unite(newOverlapRegion); resolveOverlaps(newNonOverlapRegion, overlapRegion, nonOverlapRegion); }