RenderLayer* LinkHighlight::computeEnclosingCompositingLayer()
{
if (!m_node || !m_node->renderer())
return 0;
RenderLayer* renderLayer = m_node->renderer()->enclosingLayer();
// Find the nearest enclosing composited layer and attach to it. We may need to cross frame boundaries
// to find a suitable layer.
while (renderLayer && !renderLayer->isComposited()) {
if (!renderLayer->parent()) {
// See if we've reached the root in an enclosed frame.
if (renderLayer->renderer()->frame()->ownerRenderer())
renderLayer = renderLayer->renderer()->frame()->ownerRenderer()->enclosingLayer();
else
renderLayer = 0;
} else
renderLayer = renderLayer->parent();
}
if (!renderLayer || !renderLayer->isComposited())
return 0;
m_graphicsLayerOffset = FloatPoint();
GraphicsLayerChromium* newGraphicsLayer = static_cast<GraphicsLayerChromium*>(renderLayer->backing()->graphicsLayer());
if (!newGraphicsLayer->drawsContent()) {
m_graphicsLayerOffset = newGraphicsLayer->position();
newGraphicsLayer = static_cast<GraphicsLayerChromium*>(m_owningWebViewImpl->nonCompositedContentHost()->topLevelRootLayer());
}
if (m_currentGraphicsLayer != newGraphicsLayer) {
if (m_currentGraphicsLayer)
clearGraphicsLayerLinkHighlightPointer();
m_currentGraphicsLayer = newGraphicsLayer;
m_currentGraphicsLayer->setLinkHighlight(this);
}
return renderLayer;
}
