haikuwebkit/LayoutTests/compositing/layer-creation/fixed-position-no-content-e...

There should be no layers.
position:fixed that doesn't render any content should not force compositing https://bugs.webkit.org/show_bug.cgi?id=108112 Source/WebCore: Reviewed by Beth Dakin. It's not uncommon for pages to have position:fixed elements with no content. When these are behind other elements, they can cause those other elements to become composited, using lots of backing store memory. Optimize for the case where the position:fixed element has no rendered content and no children by not making it composited in that case. Test: compositing/layer-creation/fixed-position-no-content.html * rendering/RenderLayer.cpp: (WebCore::RenderLayer::hasNonEmptyChildRenderers): Moved from RenderLayerBacking.cpp. (WebCore::hasBoxDecorations): Ditto. (WebCore::RenderLayer::hasBoxDecorationsOrBackground): Ditto. (WebCore::RenderLayer::hasVisibleBoxDecorations): Check for visibility:visible, box decorations and overflow controls. (WebCore::RenderLayer::isVisuallyNonEmpty): Returns true if this layer has some visible representation. * rendering/RenderLayer.h: * rendering/RenderLayerBacking.cpp: (WebCore::RenderLayerBacking::updateGraphicsLayerConfiguration): Need to call updateDescendantDependentFlags() to ensure that the visibility flags are up to date. (WebCore::RenderLayerBacking::updateDrawsContent): Call RenderLayer::hasBoxDecorationsOrBackground() now. (WebCore::RenderLayerBacking::paintsBoxDecorations): Call RenderLayer::hasVisibleBoxDecorations() now. (WebCore::RenderLayerBacking::paintsChildren): Call RenderLayer::hasNonEmptyChildRenderers(). (WebCore::RenderLayerBacking::isSimpleContainerCompositingLayer): Whitespace. (WebCore::RenderLayerBacking::containsPaintedContent): Call RenderLayer::hasBoxDecorationsOrBackground(). (WebCore::RenderLayerBacking::isDirectlyCompositedImage): Ditto. * rendering/RenderLayerBacking.h: (RenderLayerBacking): * rendering/RenderLayerCompositor.cpp: (WebCore::RenderLayerCompositor::requiresCompositingForPosition): If the layer has no content to paint, or visible descendant layers, then don't make it composited. LayoutTests: Reviewed by Beth Dakin. Change tests to put a background color on position:fixed elements that need to be composited. New test with an empty fixed position element. * compositing/layer-creation/fixed-position-change-out-of-view-in-view.html: * compositing/layer-creation/fixed-position-no-content-expected.txt: Added. * compositing/layer-creation/fixed-position-no-content.html: Copied from LayoutTests/compositing/layer-creation/fixed-position-out-of-view.html. * compositing/layer-creation/fixed-position-out-of-view-scaled-scroll.html: * compositing/layer-creation/fixed-position-out-of-view-scaled.html: * compositing/layer-creation/fixed-position-out-of-view.html: * platform/mac/tiled-drawing/fixed/fixed-position-out-of-view-negative-zindex.html: * platform/mac/tiled-drawing/fixed/fixed-position-out-of-view.html: Canonical link: https://commits.webkit.org/126347@main git-svn-id: https://svn.webkit.org/repository/webkit/trunk@141039 268f45cc-cd09-0410-ab3c-d52691b4dbfc 2013-01-29 04:16:56 +00:00			`There should be no layers.`