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Side by Side Diff: third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp

Issue 1826013002: Enable compositing for opaque scrolling content on low DPI screens (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 4 years, 9 months ago
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1 /* 1 /*
2 * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved. 2 * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
3 * 3 *
4 * Portions are Copyright (C) 1998 Netscape Communications Corporation. 4 * Portions are Copyright (C) 1998 Netscape Communications Corporation.
5 * 5 *
6 * Other contributors: 6 * Other contributors:
7 * Robert O'Callahan <roc+@cs.cmu.edu> 7 * Robert O'Callahan <roc+@cs.cmu.edu>
8 * David Baron <dbaron@fas.harvard.edu> 8 * David Baron <dbaron@fas.harvard.edu>
9 * Christian Biesinger <cbiesinger@gmail.com> 9 * Christian Biesinger <cbiesinger@gmail.com>
10 * Randall Jesup <rjesup@wgate.com> 10 * Randall Jesup <rjesup@wgate.com>
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1410 1410
1411 static bool layerNeedsCompositedScrolling(PaintLayerScrollableArea::LCDTextMode mode, const PaintLayer* layer) 1411 static bool layerNeedsCompositedScrolling(PaintLayerScrollableArea::LCDTextMode mode, const PaintLayer* layer)
1412 { 1412 {
1413 if (!layer->scrollsOverflow()) 1413 if (!layer->scrollsOverflow())
1414 return false; 1414 return false;
1415 1415
1416 Node* node = layer->enclosingNode(); 1416 Node* node = layer->enclosingNode();
1417 if (node && node->isElementNode() && (toElement(node)->compositorMutableProp erties() & (CompositorMutableProperty::kScrollTop | CompositorMutableProperty::k ScrollLeft))) 1417 if (node && node->isElementNode() && (toElement(node)->compositorMutableProp erties() & (CompositorMutableProperty::kScrollTop | CompositorMutableProperty::k ScrollLeft)))
1418 return true; 1418 return true;
1419 1419
1420 if (mode == PaintLayerScrollableArea::ConsiderLCDText && !layer->compositor( )->preferCompositingToLCDTextEnabled()) 1420 if (mode == PaintLayerScrollableArea::ConsiderLCDText && !layer->compositor( )->preferCompositingToLCDTextEnabled(layer))
1421 return false; 1421 return false;
1422 1422
1423 return !layer->hasDescendantWithClipPath() 1423 return !layer->hasDescendantWithClipPath()
1424 && !layer->hasAncestorWithClipPath() 1424 && !layer->hasAncestorWithClipPath()
1425 && !layer->layoutObject()->style()->hasBorderRadius(); 1425 && !layer->layoutObject()->style()->hasBorderRadius();
1426 } 1426 }
1427 1427
1428 void PaintLayerScrollableArea::updateNeedsCompositedScrolling(LCDTextMode mode) 1428 void PaintLayerScrollableArea::updateNeedsCompositedScrolling(LCDTextMode mode)
1429 { 1429 {
1430 const bool needsCompositedScrolling = layerNeedsCompositedScrolling(mode, la yer()); 1430 const bool needsCompositedScrolling = layerNeedsCompositedScrolling(mode, la yer());
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1585 } 1585 }
1586 1586
1587 DEFINE_TRACE(PaintLayerScrollableArea::ScrollbarManager) 1587 DEFINE_TRACE(PaintLayerScrollableArea::ScrollbarManager)
1588 { 1588 {
1589 visitor->trace(m_scrollableArea); 1589 visitor->trace(m_scrollableArea);
1590 visitor->trace(m_hBar); 1590 visitor->trace(m_hBar);
1591 visitor->trace(m_vBar); 1591 visitor->trace(m_vBar);
1592 } 1592 }
1593 1593
1594 } // namespace blink 1594 } // namespace blink
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