third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp - Issue 2259493004: Fix Compositing of Opaque Scrolling Layers and Add Tests

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Unified Diff: third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp

Issue 2259493004: Fix Compositing of Opaque Scrolling Layers and Add Tests (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master

Patch Set: New tests. Created 4 years, 4 months ago

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« third_party/WebKit/Source/core/paint/PaintLayer.cpp ('K') | « third_party/WebKit/Source/core/paint/PaintLayer.cpp ('k') | third_party/WebKit/Source/core/paint/PaintLayerScrollableAreaTest.cpp » ('j') | no next file with comments »
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Index: third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp

diff --git a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp

index 9a11c12539444ff9e77ed2f7389253e964c8bef3..5e522cacd123a394575b961d1cb17bc1872c9254 100644

--- a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp

+++ b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp

@@ -1497,11 +1497,9 @@ static bool layerNeedsCompositedScrolling(PaintLayerScrollableArea::LCDTextMode

if (node && node->isElementNode() && (toElement(node)->compositorMutableProperties() & (CompositorMutableProperty::kScrollTop | CompositorMutableProperty::kScrollLeft)))

return true;

- // TODO(schenney) The color test alone is inadequate. When https://codereview.chromium.org/2196583002 lands

- // we should use PaintLayer::shouldPaintBackgroundOntoForeground() because we will not still get

- // LCD text unless the conditions there are met. It also unifies logic for scrolling compositing decisions.

bool backgroundSupportsLCDText = RuntimeEnabledFeatures::compositeOpaqueScrollersEnabled()

- && !layer->layoutObject()->style()->visitedDependentColor(CSSPropertyBackgroundColor).hasAlpha();

+ && layer->shouldPaintBackgroundOntoScrollingContentsLayer()

+ && layer->backgroundIsKnownToBeOpaqueInRect(toLayoutBox(layer->layoutObject())->paddingBoxRect());

if (mode == PaintLayerScrollableArea::ConsiderLCDText

&& !layer->compositor()->preferCompositingToLCDTextEnabled()

&& !backgroundSupportsLCDText)