void CoordinatedGraphicsLayer::updateContentBuffers()
{
if (!shouldHaveBackingStore()) {
m_mainBackingStore = nullptr;
m_previousBackingStore = nullptr;
return;
}
if (m_pendingContentsScaleAdjustment) {
adjustContentsScale();
m_pendingContentsScaleAdjustment = false;
}
// This is the only place we (re)create the main tiled backing store, once we
// have a remote client and we are ready to send our data to the UI process.
if (!m_mainBackingStore)
createBackingStore();
if (m_pendingVisibleRectAdjustment) {
m_pendingVisibleRectAdjustment = false;
m_mainBackingStore->coverWithTilesIfNeeded();
}
m_mainBackingStore->updateTileBuffers();
// The previous backing store is kept around to avoid flickering between
// removing the existing tiles and painting the new ones. The first time
// the visibleRect is full painted we remove the previous backing store.
if (m_mainBackingStore->visibleAreaIsCovered())
m_previousBackingStore = nullptr;
}
void WebGraphicsLayer::computeTransformedVisibleRect()
{
if (!m_shouldUpdateVisibleRect)
return;
m_shouldUpdateVisibleRect = false;
m_layerTransform.setLocalTransform(transform());
m_layerTransform.setPosition(position());
m_layerTransform.setAnchorPoint(anchorPoint());
m_layerTransform.setSize(size());
m_layerTransform.setFlattening(!preserves3D());
m_layerTransform.setChildrenTransform(childrenTransform());
m_layerTransform.combineTransforms(parent() ? toWebGraphicsLayer(parent())->m_layerTransform.combinedForChildren() : TransformationMatrix());
// The combined transform will be used in tiledBackingStoreVisibleRect.
adjustVisibleRect();
adjustContentsScale();
}
void WebGraphicsLayer::setContentsScale(float scale)
{
m_contentsScale = scale;
adjustContentsScale();
}
