1 // Copyright 2014 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "config.h" 6 #include "core/rendering/PaintInvalidationState.h" 7 8 #include "core/rendering/RenderInline.h" 9 #include "core/rendering/RenderLayer.h" 10 #include "core/rendering/RenderView.h" 11 #include "core/rendering/svg/RenderSVGModelObject.h" 12 #include "platform/Partitions.h" 13 14 namespace blink { 15 16 PaintInvalidationState::PaintInvalidationState(const RenderView& renderView) 17 : m_clipped(false) 18 , m_cachedOffsetsEnabled(true) 19 , m_forceCheckForPaintInvalidation(false) 20 , m_paintInvalidationContainer(*renderView.containerForPaintInvalidation()) 21 { 22 bool establishesPaintInvalidationContainer = renderView == m_paintInvalidationContainer; 23 if (!establishesPaintInvalidationContainer) { 24 if (!renderView.supportsPaintInvalidationStateCachedOffsets()) { 25 m_cachedOffsetsEnabled = false; 26 return; 27 } 28 FloatPoint point = renderView.localToContainerPoint(FloatPoint(), &m_paintInvalidationContainer, TraverseDocumentBoundaries); 29 m_paintOffset = LayoutSize(point.x(), point.y()); 30 } 31 m_clipRect = renderView.viewRect(); 32 m_clipRect.move(m_paintOffset); 33 m_clipped = true; 34 } 35 36 PaintInvalidationState::PaintInvalidationState(const PaintInvalidationState& next, RenderLayerModelObject& renderer, const RenderLayerModelObject& paintInvalidationContainer) 37 : m_clipped(false) 38 , m_cachedOffsetsEnabled(true) 39 , m_forceCheckForPaintInvalidation(next.m_forceCheckForPaintInvalidation) 40 , m_paintInvalidationContainer(paintInvalidationContainer) 41 { 42 // FIXME: SVG could probably benefit from a stack-based optimization like html does. crbug.com/391054 43 bool establishesPaintInvalidationContainer = renderer == m_paintInvalidationContainer; 44 bool fixed = renderer.style()->position() == FixedPosition; 45 46 if (establishesPaintInvalidationContainer) { 47 // When we hit a new paint invalidation container, we don't need to 48 // continue forcing a check for paint invalidation because movement 49 // from our parents will just move the whole invalidation container. 50 m_forceCheckForPaintInvalidation = false; 51 } else { 52 if (!renderer.supportsPaintInvalidationStateCachedOffsets() || !next.m_cachedOffsetsEnabled) { 53 m_cachedOffsetsEnabled = false; 54 } else { 55 if (fixed) { 56 FloatPoint fixedOffset = renderer.localToContainerPoint(FloatPoint(), &m_paintInvalidationContainer, TraverseDocumentBoundaries); 57 m_paintOffset = LayoutSize(fixedOffset.x(), fixedOffset.y()); 58 } else { 59 LayoutSize offset = renderer.isBox() && !renderer.isTableRow() ? toRenderBox(renderer).locationOffset() : LayoutSize(); 60 m_paintOffset = next.m_paintOffset + offset; 61 } 62 63 if (renderer.isOutOfFlowPositioned() && !fixed) { 64 if (RenderObject* container = renderer.container()) { 65 if (container->style()->hasInFlowPosition() && container->isRenderInline()) 66 m_paintOffset += toRenderInline(container)->offsetForInFlowPositionedInline(toRenderBox(renderer)); 67 } 68 } 69 70 if (renderer.style()->hasInFlowPosition() && renderer.hasLayer()) 71 m_paintOffset += renderer.layer()->offsetForInFlowPosition(); 72 } 73 74 m_clipped = !fixed && next.m_clipped; 75 if (m_clipped) 76 m_clipRect = next.m_clipRect; 77 } 78 79 applyClipIfNeeded(renderer); 80 81 // FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present. 82 } 83 84 void PaintInvalidationState::applyClipIfNeeded(const RenderObject& renderer) 85 { 86 if (!renderer.hasOverflowClip()) 87 return; 88 89 const RenderBox& box = toRenderBox(renderer); 90 91 // Do not clip scroll layer contents because the compositor expects the whole layer 92 // to be always invalidated in-time. 93 if (box.usesCompositedScrolling()) { 94 ASSERT(!m_clipped); // The box should establish paint invalidation container, so no m_clipped inherited. 95 } else { 96 LayoutRect clipRect(toPoint(m_paintOffset), box.layer()->size()); 97 if (m_clipped) { 98 m_clipRect.intersect(clipRect); 99 } else { 100 m_clipRect = clipRect; 101 m_clipped = true; 102 } 103 } 104 105 m_paintOffset -= box.scrolledContentOffset(); 106 } 107 108 } // namespace blink 109