TextureMapperLayer::computeOverlapRegions doesn't need to use m_state.contentsRect computeOverlapRegions has the following code. > if (m_backingStore || m_state.masksToBounds || m_state.maskLayer || hasFilters()) > localBoundingRect = layerRect(); > else if (m_contentsLayer || m_state.solidColor.isVisible()) > localBoundingRect = m_state.contentsRect; But, I don't know why m_state.contentsRect is used. It was added by 129278@main (Bug 110762).
It might be for content layers with padding and transparent background.