Late-loading stylesheets can cause composited layers to be blank

https://bugs.webkit.org/show_bug.cgi?id=103773

Reviewed by Tim Horton.

Early painting can be short-circuited in RenderBlock::paintContents() if we know a stylesheet
is pending, which is done to avoid a flash of unstyled content (FOUC). When the stylesheet
finally loaded, Document::styleResolverChanged() would try to repaint everything by calling
repaint() on the RenderView(). In a composited world, however, this repaint() doesn't repaint
composited layers.

This was particularly prevalent on this specific URL because it failed to load
a CSS file from typekit.com, so Document::styleResolverChanged()
just did the repaint and returned (rather than doing a recalc style as would
happen for correctly loaded stylesheets).

Fix by making a way to repaint all compositing layers, and calling it
from Document::styleResolverChanged().

No tests because this is timing-dependant.

* dom/Document.cpp:
(WebCore::Document::styleResolverChanged): Call repaintViewAndCompositedLayers().
* rendering/RenderBlock.cpp:
(WebCore::RenderBlock::paintContents): Fix the comment.
* rendering/RenderLayerCompositor.cpp: Convert repaintCompositedLayersAbsoluteRect()
and associated recursiveRepaintLayerRect() to allow the rect to be null, which indicates
that we should just repaint the entire layer, and improve their names.
(WebCore::RenderLayerCompositor::repaintCompositedLayers):
(WebCore::RenderLayerCompositor::recursiveRepaintLayer):
* rendering/RenderLayerCompositor.h:
* rendering/RenderView.cpp:
(WebCore::RenderView::repaintRectangleInViewAndCompositedLayers): repaintCompositedLayersAbsoluteRect()
was renamed to repaintCompositedLayers().
(WebCore::RenderView::repaintViewAndCompositedLayers):
* rendering/RenderView.h:
(RenderView): repaintViewRectangle() and repaintRectangleInViewAndCompositedLayers() should not
be virtual. Add repaintViewAndCompositedLayers().

Change-Id: I86401d25d06128db33a5e5db099144d6b05850ef
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@136277 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>

0 files changed, 0 insertions, 0 deletions