Set m_compositingDependsOnGeometry to false if possible
https://bugs.webkit.org/show_bug.cgi?id=84391
Reviewed by James Robinson.
For some kinds of elements, RenderLayerCompositor has to delay decisions about
compositing until the element's size and/or position are known. This was previsouly
based on the confusingly named m_compositingDependsOnGeometry flag, but another
variant of the same technique, with an additional flag m_compositingNeedsUpdate,
was added in r98627.
Also, once the m_compositingDependsOnGeometry flag was set to true, nothing
set it to false, so every compositing layer update resulted in a computeCompositingRequirements()
pass over the layers.
Rename the m_compositingDependsOnGeometry flag to m_reevaluateCompositingAfterLayout,
and clear the flag when we do a layout-related compositing layer update.
Use the same flag for position:fixed compositing.
This requires RenderLayerCompositor to distinguish between style- and layout-
related updates, requiring some minor refactoring in FrameView.
Should not change behavior.
* dom/Document.cpp:
(WebCore::Document::recalcStyle):
(WebCore::Document::implicitClose):
* page/FrameView.cpp:
(WebCore::FrameView::updateCompositingLayersAfterStyleChange):
(WebCore::FrameView::updateCompositingLayersAfterLayout):
(WebCore::FrameView::restoreBackingStores):
(WebCore::FrameView::layout):
* page/FrameView.h:
(FrameView):
* rendering/RenderLayerCompositor.cpp:
(WebCore::RenderLayerCompositor::RenderLayerCompositor):
(WebCore::RenderLayerCompositor::updateCompositingLayersTimerFired):
(WebCore::RenderLayerCompositor::updateCompositingLayers):
(WebCore::RenderLayerCompositor::layerTreeAsText):
(WebCore::RenderLayerCompositor::requiresCompositingForPlugin):
(WebCore::RenderLayerCompositor::requiresCompositingForFrame):
(WebCore::RenderLayerCompositor::requiresCompositingForPosition):
* rendering/RenderLayerCompositor.h:
(RenderLayerCompositor):
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114785 268f45cc-cd09-0410-ab3c-d52691b4dbfc
6 files changed
