third_party/WebKit/Source/core/page/scrolling/RootScrollerController.cpp - Issue 2289833002: Disable clipping on root scroller's ancestors.

Unified Diff: third_party/WebKit/Source/core/page/scrolling/RootScrollerController.cpp

Issue 2289833002: Disable clipping on root scroller's ancestors. (Closed)

Patch Set: Also setNeedsCompositingUpdate from TopDocumentRootScrollerController Created 4 years, 3 months ago

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Index: third_party/WebKit/Source/core/page/scrolling/RootScrollerController.cpp

diff --git a/third_party/WebKit/Source/core/page/scrolling/RootScrollerController.cpp b/third_party/WebKit/Source/core/page/scrolling/RootScrollerController.cpp

index 0125aa0da4c16dcf65be4480bfc40b2cf8714df9..c8c9761ab92f6a1ad280d6af8fd2aba66baecee7 100644

--- a/third_party/WebKit/Source/core/page/scrolling/RootScrollerController.cpp

+++ b/third_party/WebKit/Source/core/page/scrolling/RootScrollerController.cpp

@@ -10,6 +10,8 @@

#include "core/frame/FrameView.h"

#include "core/layout/LayoutBox.h"

#include "core/layout/api/LayoutViewItem.h"

+#include "core/layout/compositing/PaintLayerCompositor.h"

+#include "core/paint/PaintLayer.h"

#include "core/paint/PaintLayerScrollableArea.h"

#include "platform/graphics/GraphicsLayer.h"

#include "platform/scroll/ScrollableArea.h"

@@ -100,8 +102,23 @@ void RootScrollerController::recomputeEffectiveRootScroller()

if (m_effectiveRootScroller == newEffectiveRootScroller)

return;

+ PaintLayer* oldRootScrollerLayer = rootScrollerPaintLayer();

m_effectiveRootScroller = newEffectiveRootScroller;

+ // This change affects both the old and new layers.

+ if (oldRootScrollerLayer)

+ oldRootScrollerLayer->setNeedsCompositingInputsUpdate();

+ if (rootScrollerPaintLayer())

+ rootScrollerPaintLayer()->setNeedsCompositingInputsUpdate();

+ // The above may not be enough as we need to update existing ancestor

+ // GraphicsLayers. This will force us to rebuild the GraphicsLayer tree.

+ if (LayoutView* layoutView = m_document->layoutView()) {

+ layoutView->compositor()

+ ->setNeedsCompositingUpdate(CompositingUpdateRebuildTree);

+ }

m_document->topDocument().rootScrollerController()

->globalRootScrollerMayHaveChanged();

}

@@ -172,6 +189,27 @@ bool RootScrollerController::isViewportScrollCallback(

return topDocumentController->isViewportScrollCallback(callback);

}

+PaintLayer* RootScrollerController::rootScrollerPaintLayer() const

+ if (!m_effectiveRootScroller

+ || !m_effectiveRootScroller->layoutObject()

+ || !m_effectiveRootScroller->layoutObject()->isBox())

+ return nullptr;

+ LayoutBox* box = toLayoutBox(m_effectiveRootScroller->layoutObject());

+ PaintLayer* layer = box->layer();

+ // If the root scroller is the <html> element we do a bit of a fake out because

+ // while <html> has a PaintLayer, scrolling for it is handled by the #document's

+ // PaintLayer (i.e. the PaintLayerCompositor's root layer). The reason the root

+ // scroller is the <html> layer and not #document is because the latter is a Node

+ // but not an Element.

+ if (m_effectiveRootScroller->isSameNode(m_document->documentElement()))

+ return layer->compositor()->rootLayer();

+ return layer;

Element* RootScrollerController::defaultEffectiveRootScroller()

{

DCHECK(m_document);