[S.P.] Don't draw frames of animated images that are offscreen

Source/core/layout/PaintInvalidationState.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/layout/PaintInvalidationState.h"
 
 #include "core/layout/LayoutInline.h"
 #include "core/layout/LayoutView.h"
 #include "core/layout/svg/LayoutSVGModelObject.h"
 #include "core/layout/svg/LayoutSVGRoot.h"
 #include "core/paint/DeprecatedPaintLayer.h"
 #include "platform/Partitions.h"
 
 namespace blink {
 
-PaintInvalidationState::PaintInvalidationState(const LayoutView& layoutView)
+PaintInvalidationState::PaintInvalidationState(const LayoutView& layoutView, Vector<LayoutObject*>& pendingDelayedPaintInvalidations)
     : m_clipped(false)
     , m_cachedOffsetsEnabled(true)
     , m_forceCheckForPaintInvalidation(false)
     , m_paintInvalidationContainer(*layoutView.containerForPaintInvalidation())
+    , m_pendingDelayedPaintInvalidations(pendingDelayedPaintInvalidations)
 {
     bool establishesPaintInvalidationContainer = layoutView == m_paintInvalidationContainer;
     if (!establishesPaintInvalidationContainer) {
         if (!layoutView.supportsPaintInvalidationStateCachedOffsets()) {
             m_cachedOffsetsEnabled = false;
             return;
         }
         FloatPoint point = layoutView.localToContainerPoint(FloatPoint(), &m_paintInvalidationContainer, TraverseDocumentBoundaries);
         m_paintOffset = LayoutSize(point.x(), point.y());
     }
     m_clipRect = layoutView.viewRect();
     m_clipRect.move(m_paintOffset);
     m_clipped = true;
 }
 
-PaintInvalidationState::PaintInvalidationState(const PaintInvalidationState& next, LayoutBoxModelObject& renderer, const LayoutBoxModelObject& paintInvalidationContainer)
+PaintInvalidationState::PaintInvalidationState(PaintInvalidationState& next, LayoutBoxModelObject& renderer, const LayoutBoxModelObject& paintInvalidationContainer)
     : m_clipped(false)
     , m_cachedOffsetsEnabled(true)
     , m_forceCheckForPaintInvalidation(next.m_forceCheckForPaintInvalidation)
     , m_paintInvalidationContainer(paintInvalidationContainer)
+    , m_pendingDelayedPaintInvalidations(next.pendingDelayedPaintInvalidationTargets())
 {
     // FIXME: SVG could probably benefit from a stack-based optimization like html does. crbug.com/391054
     bool establishesPaintInvalidationContainer = renderer == m_paintInvalidationContainer;
     bool fixed = renderer.style()->position() == FixedPosition;
 
     if (!renderer.supportsPaintInvalidationStateCachedOffsets() || !next.m_cachedOffsetsEnabled)
         m_cachedOffsetsEnabled = false;
     if (establishesPaintInvalidationContainer) {
         // When we hit a new paint invalidation container, we don't need to
         // continue forcing a check for paint invalidation because movement
@@ skipping 30 matching lines @@
         m_svgTransform = adoptPtr(new AffineTransform(svgRoot.localToBorderBoxTransform()));
         if (svgRoot.shouldApplyViewportClip())
             addClipRectRelativeToPaintOffset(LayoutSize(svgRoot.pixelSnappedSize()));
     }
 
     applyClipIfNeeded(renderer);
 
     // FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present.
 }
 
-PaintInvalidationState::PaintInvalidationState(const PaintInvalidationState& next, const LayoutSVGModelObject& renderer)
+PaintInvalidationState::PaintInvalidationState(PaintInvalidationState& next, const LayoutSVGModelObject& renderer)
     : m_clipped(next.m_clipped)
     , m_cachedOffsetsEnabled(next.m_cachedOffsetsEnabled)
     , m_forceCheckForPaintInvalidation(next.m_forceCheckForPaintInvalidation)
     , m_clipRect(next.m_clipRect)
     , m_paintOffset(next.m_paintOffset)
     , m_paintInvalidationContainer(next.m_paintInvalidationContainer)
+    , m_pendingDelayedPaintInvalidations(next.pendingDelayedPaintInvalidationTargets())
 {
     ASSERT(renderer != m_paintInvalidationContainer);
 
     if (m_cachedOffsetsEnabled)
         m_svgTransform = adoptPtr(new AffineTransform(next.svgTransform() * renderer.localToParentTransform()));
 }
 
 void PaintInvalidationState::addClipRectRelativeToPaintOffset(const LayoutSize& clipSize)
 {
     LayoutRect clipRect(toPoint(m_paintOffset), clipSize);
@@ skipping 16 matching lines @@
     // to be always invalidated in-time.
     if (box.usesCompositedScrolling())
         ASSERT(!m_clipped); // The box should establish paint invalidation container, so no m_clipped inherited.
     else
         addClipRectRelativeToPaintOffset(LayoutSize(box.layer()->size()));
 
     m_paintOffset -= box.scrolledContentOffset();
 }
 
 } // namespace blink