Enable fast/images with slimming paint

Source/core/paint/LayerPainter.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/paint/LayerPainter.h"
 
 #include "core/frame/Settings.h"
 #include "core/page/Page.h"
 #include "core/paint/FilterPainter.h"
+#include "core/paint/LayerClipRecorder.h"
 #include "core/paint/TransformDisplayItem.h"
 #include "core/paint/TransparencyDisplayItem.h"
 #include "core/rendering/ClipPathOperation.h"
 #include "core/rendering/FilterEffectRenderer.h"
 #include "core/rendering/PaintInfo.h"
 #include "core/rendering/RenderBlock.h"
 #include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderView.h"
 #include "core/rendering/svg/RenderSVGResourceClipper.h"
 
@@ skipping 51 matching lines @@
 
     // PaintLayerAppliedTransform is used in RenderReplica, to avoid applying the transform twice.
     if (m_renderLayer.paintsWithTransform(paintingInfo.paintBehavior) && !(paintFlags & PaintLayerAppliedTransform)) {
         paintLayerWithTransform(context, paintingInfo, paintFlags);
         return;
     }
 
     paintLayerContentsAndReflection(context, paintingInfo, paintFlags);
 }
 
-class TransparencyLayerHelper {
-public:
-    TransparencyLayerHelper(GraphicsContext* context, RenderLayer& renderLayer, const RenderLayer* rootLayer, const LayoutRect& paintDirtyRect, const LayoutSize& subPixelAccumulation, PaintBehavior paintBehavior)
-        : m_transparencyLayerInProgress(false)
-        , m_context(context)
-        , m_renderLayer(renderLayer)
-    {
-        // Blending operations must be performed only with the nearest ancestor stacking context.
-        // Note that there is no need to create a transparency layer if we're painting the root.
-        // FIXME: this should be unified further into RenderLayer::paintsWithTransparency().
-        bool shouldUseTransparencyLayerForBlendMode = !renderLayer.renderer()->isDocumentElement() && renderLayer.stackingNode()->isStackingContext() && renderLayer.hasNonIsolatedDescendantWithBlendMode();
-        if (!shouldUseTransparencyLayerForBlendMode && !renderLayer.paintsWithTransparency(paintBehavior))
-            return;
-
-        OwnPtr<BeginTransparencyDisplayItem> beginTransparencyDisplayItem = adoptPtr(new BeginTransparencyDisplayItem(
-            renderLayer.renderer(), DisplayItem::BeginTransparency, renderLayer.paintingExtent(rootLayer, paintDirtyRect, subPixelAccumulation, paintBehavior),
-            renderLayer.renderer()->style()->blendMode(), renderLayer.renderer()->opacity()));
-        if (RuntimeEnabledFeatures::slimmingPaintEnabled())
-            renderLayer.renderer()->view()->viewDisplayList().add(beginTransparencyDisplayItem.release());
-        else
-            beginTransparencyDisplayItem->replay(context);
-
-        m_transparencyLayerInProgress = true;
-    }
-
-    ~TransparencyLayerHelper()
-    {
-        if (!m_transparencyLayerInProgress)
-            return;
-        OwnPtr<EndTransparencyDisplayItem> endTransparencyDisplayItem = adoptPtr(new EndTransparencyDisplayItem(m_renderLayer.renderer(), DisplayItem::EndTransparency));
-        if (RuntimeEnabledFeatures::slimmingPaintEnabled())
-            m_renderLayer.renderer()->view()->viewDisplayList().add(endTransparencyDisplayItem.release());
-        else
-            endTransparencyDisplayItem->replay(m_context);
-    }
-private:
-    bool m_transparencyLayerInProgress;
-    GraphicsContext* m_context;
-    const RenderLayer& m_renderLayer;
-};
-
 void LayerPainter::paintLayerContentsAndReflection(GraphicsContext* context, const LayerPaintingInfo& paintingInfo, PaintLayerFlags paintFlags)
 {
     ASSERT(m_renderLayer.isSelfPaintingLayer() || m_renderLayer.hasSelfPaintingLayerDescendant());
 
     PaintLayerFlags localPaintFlags = paintFlags & ~(PaintLayerAppliedTransform);
 
     // Paint the reflection first if we have one.
     if (m_renderLayer.reflectionInfo())
         m_renderLayer.reflectionInfo()->paint(context, paintingInfo, localPaintFlags | PaintLayerPaintingReflection);
 
@@ skipping 103 matching lines @@
 
     if (m_renderLayer.compositingState() == PaintsIntoOwnBacking)
         offsetFromRoot.move(m_renderLayer.subpixelAccumulation());
 
     LayoutRect rootRelativeBounds;
     bool rootRelativeBoundsComputed = false;
 
     // These helpers output clip and transparency layers using a RAII pattern. Stack-allocated-varibles are destructed in the reverse order of construction,
     // so they are nested properly.
     ClipPathHelper clipPathHelper(context, m_renderLayer, paintingInfo, rootRelativeBounds, rootRelativeBoundsComputed, offsetFromRoot, paintFlags);
-    TransparencyLayerHelper transparencyLayerHelper(context, m_renderLayer, paintingInfo.rootLayer, paintingInfo.paintDirtyRect, paintingInfo.subPixelAccumulation, paintingInfo.paintBehavior);
+
+    OwnPtr<TransparencyRecorder> transparencyRecorder;
+    OwnPtr<LayerClipRecorder> clipRecorder;
+    // Blending operations must be performed only with the nearest ancestor stacking context.
+    // Note that there is no need to create a transparency layer if we're painting the root.
+    // FIXME: this should be unified further into RenderLayer::paintsWithTransparency().
+    bool shouldUseTransparencyLayerForBlendMode = !m_renderLayer.renderer()->isDocumentElement() && m_renderLayer.stackingNode()->isStackingContext() && m_renderLayer.hasNonIsolatedDescendantWithBlendMode();
+    if (shouldUseTransparencyLayerForBlendMode || m_renderLayer.paintsWithTransparency(paintingInfo.paintBehavior)) {
+        clipRecorder = adoptPtr(new LayerClipRecorder(m_renderLayer.renderer(), context, DisplayItem::TransparencyClip,
+            m_renderLayer.paintingExtent(paintingInfo.rootLayer, paintingInfo.paintDirtyRect, paintingInfo.subPixelAccumulation, paintingInfo.paintBehavior),
+            &paintingInfo, LayoutPoint(), paintFlags));
+
+        transparencyRecorder = adoptPtr(new TransparencyRecorder(context, m_renderLayer.renderer(), DisplayItem::BeginTransparency,
+            m_renderLayer.renderer()->style()->blendMode(), m_renderLayer.renderer()->opacity()));
+    }
 
     LayerPaintingInfo localPaintingInfo(paintingInfo);
 
     LayerFragments layerFragments;
     if (shouldPaintContent || shouldPaintOutline || isPaintingOverlayScrollbars) {
         // Collect the fragments. This will compute the clip rectangles and paint offsets for each layer fragment.
         m_renderLayer.collectFragments(layerFragments, localPaintingInfo.rootLayer, localPaintingInfo.paintDirtyRect,
             (paintFlags & PaintLayerUncachedClipRects) ? UncachedClipRects : PaintingClipRects, IgnoreOverlayScrollbarSize,
             shouldRespectOverflowClip(paintFlags, m_renderLayer.renderer()), &offsetFromRoot, localPaintingInfo.subPixelAccumulation);
         if (shouldPaintContent)
@@ skipping 124 matching lines @@
         // We don't need to collect any fragments in the regular way here. We have already
         // calculated a clip rectangle for the ancestry if it was needed, and clipping this
         // layer is something that can be done further down the path, when the transform has
         // been applied.
         LayerFragment fragment;
         fragment.backgroundRect = paintingInfo.paintDirtyRect;
         fragments.append(fragment);
     }
 
     for (const auto& fragment: fragments) {
-        OwnPtr<ClipRecorder> clipRecorder;
+        OwnPtr<LayerClipRecorder> clipRecorder;
         if (parentLayer) {
             ClipRect clipRectForFragment(clipRect);
             clipRectForFragment.moveBy(fragment.paginationOffset);
             clipRectForFragment.intersect(fragment.backgroundRect);
             if (clipRectForFragment.isEmpty())
                 continue;
             if (needsToClip(paintingInfo, clipRectForFragment))
-                clipRecorder = adoptPtr(new ClipRecorder(parentLayer->renderer(), context, DisplayItem::ClipLayerParent, clipRectForFragment, &paintingInfo, fragment.paginationOffset, paintFlags));
+                clipRecorder = adoptPtr(new LayerClipRecorder(parentLayer->renderer(), context, DisplayItem::ClipLayerParent, clipRectForFragment, &paintingInfo, fragment.paginationOffset, paintFlags));
         }
 
         paintFragmentByApplyingTransform(context, paintingInfo, paintFlags, fragment.paginationOffset);
     }
 }
 
 void LayerPainter::paintFragmentByApplyingTransform(GraphicsContext* context, const LayerPaintingInfo& paintingInfo, PaintLayerFlags paintFlags, const LayoutPoint& fragmentTranslation)
 {
     // This involves subtracting out the position of the layer in our current coordinate space, but preserving
     // the accumulated error for sub-pixel layout.
@@ skipping 74 matching lines @@
     if (compositingState == PaintsIntoOwnBacking)
         return LayoutSize();
     return subPixelAccumulation;
 }
 
 void LayerPainter::paintOverflowControlsForFragments(const LayerFragments& layerFragments, GraphicsContext* context, const LayerPaintingInfo& localPaintingInfo, PaintLayerFlags paintFlags)
 {
     for (size_t i = 0; i < layerFragments.size(); ++i) {
         const LayerFragment& fragment = layerFragments.at(i);
 
-        OwnPtr<ClipRecorder> clipRecorder;
+        OwnPtr<LayerClipRecorder> clipRecorder;
 
         if (needsToClip(localPaintingInfo, fragment.backgroundRect)) {
-            clipRecorder = adoptPtr(new ClipRecorder(m_renderLayer.renderer(), context, DisplayItem::ClipLayerOverflowControls, fragment.backgroundRect, &localPaintingInfo, fragment.paginationOffset, paintFlags));
+            clipRecorder = adoptPtr(new LayerClipRecorder(m_renderLayer.renderer(), context, DisplayItem::ClipLayerOverflowControls, fragment.backgroundRect, &localPaintingInfo, fragment.paginationOffset, paintFlags));
         }
         if (RenderLayerScrollableArea* scrollableArea = m_renderLayer.scrollableArea())
             scrollableArea->paintOverflowControls(context, roundedIntPoint(toPoint(fragment.layerBounds.location() - m_renderLayer.renderBoxLocation() + subPixelAccumulationIfNeeded(localPaintingInfo.subPixelAccumulation, m_renderLayer.compositingState()))), pixelSnappedIntRect(fragment.backgroundRect.rect()), true);
     }
 }
 
 static bool checkContainingBlockChainForPagination(RenderLayerModelObject* renderer, RenderBox* ancestorColumnsRenderer)
 {
     RenderView* view = renderer->view();
     RenderLayerModelObject* prevBlock = renderer;
@@ skipping 128 matching lines @@
         LayoutUnit blockDelta = isHorizontal ? colRect.height() : colRect.width();
         if (columnBlock->style()->isFlippedBlocksWritingMode())
             currLogicalTopOffset += blockDelta;
         else
             currLogicalTopOffset -= blockDelta;
     }
 }
 
 void LayerPainter::paintFragmentWithPhase(PaintPhase phase, const LayerFragment& fragment, GraphicsContext* context, const ClipRect& clipRect, const LayerPaintingInfo& paintingInfo, PaintBehavior paintBehavior, RenderObject* paintingRootForRenderer, PaintLayerFlags paintFlags, ClipState clipState)
 {
-    OwnPtr<ClipRecorder> clipRecorder;
+    OwnPtr<LayerClipRecorder> clipRecorder;
     if (clipState != HasClipped && paintingInfo.clipToDirtyRect && needsToClip(paintingInfo, clipRect)) {
-        ClipRecorder::BorderRadiusClippingRule clippingRule = ClipRecorder::IncludeSelfForBorderRadius;
+        LayerClipRecorder::BorderRadiusClippingRule clippingRule = LayerClipRecorder::IncludeSelfForBorderRadius;
         DisplayItem::Type clipType = DisplayItem::ClipLayerFragmentFloat;
         switch (phase) {
         case PaintPhaseFloat:
             break;
         case PaintPhaseForeground:
             clipType = DisplayItem::ClipLayerFragmentForeground;
             break;
         case PaintPhaseChildOutlines:
             clipType = DisplayItem::ClipLayerFragmentChildOutline;
             break;
         case PaintPhaseSelection:
             clipType = DisplayItem::ClipLayerFragmentSelection;
             break;
         case PaintPhaseChildBlockBackgrounds:
             clipType = DisplayItem::ClipLayerFragmentChildBlockBackgrounds;
             break;
         case PaintPhaseBlockBackground:
             clipType = DisplayItem::ClipLayerBackground;
-            clippingRule = ClipRecorder::DoNotIncludeSelfForBorderRadius; // Background painting will handle clipping to self.
+            clippingRule = LayerClipRecorder::DoNotIncludeSelfForBorderRadius; // Background painting will handle clipping to self.
             break;
         case PaintPhaseSelfOutline:
             clipType = DisplayItem::ClipLayerFragmentOutline;
-            clippingRule = ClipRecorder::DoNotIncludeSelfForBorderRadius;
+            clippingRule = LayerClipRecorder::DoNotIncludeSelfForBorderRadius;
             break;
         case PaintPhaseMask:
             clipType = DisplayItem::ClipLayerFragmentMask;
-            clippingRule = ClipRecorder::DoNotIncludeSelfForBorderRadius; // Mask painting will handle clipping to self.
+            clippingRule = LayerClipRecorder::DoNotIncludeSelfForBorderRadius; // Mask painting will handle clipping to self.
             break;
         case PaintPhaseClippingMask:
             clipType = DisplayItem::ClipLayerFragmentClippingMask;
             break;
         default:
             ASSERT_NOT_REACHED();
         }
 
-        clipRecorder = adoptPtr(new ClipRecorder(m_renderLayer.renderer(), context, clipType, clipRect, &paintingInfo, fragment.paginationOffset, paintFlags, clippingRule));
+        clipRecorder = adoptPtr(new LayerClipRecorder(m_renderLayer.renderer(), context, clipType, clipRect, &paintingInfo, fragment.paginationOffset, paintFlags, clippingRule));
     }
 
     PaintInfo paintInfo(context, pixelSnappedIntRect(clipRect.rect()), phase, paintBehavior, paintingRootForRenderer, 0, paintingInfo.rootLayer->renderer());
     m_renderLayer.renderer()->paint(paintInfo, toPoint(fragment.layerBounds.location() - m_renderLayer.renderBoxLocation() + subPixelAccumulationIfNeeded(paintingInfo.subPixelAccumulation, m_renderLayer.compositingState())));
 }
 
 void LayerPainter::paintBackgroundForFragments(const LayerFragments& layerFragments, GraphicsContext* context,
     const LayoutRect& transparencyPaintDirtyRect, const LayerPaintingInfo& localPaintingInfo, PaintBehavior paintBehavior,
     RenderObject* paintingRootForRenderer, PaintLayerFlags paintFlags)
 {
     for (const auto& fragment: layerFragments) {
         paintFragmentWithPhase(PaintPhaseBlockBackground, fragment, context, fragment.backgroundRect, localPaintingInfo, paintBehavior, paintingRootForRenderer, paintFlags, HasNotClipped);
     }
 }
 
 void LayerPainter::paintForegroundForFragments(const LayerFragments& layerFragments, GraphicsContext* context,
     const LayoutRect& transparencyPaintDirtyRect, const LayerPaintingInfo& localPaintingInfo, PaintBehavior paintBehavior,
     RenderObject* paintingRootForRenderer, bool selectionOnly, PaintLayerFlags paintFlags)
 {
     // Optimize clipping for the single fragment case.
     bool shouldClip = localPaintingInfo.clipToDirtyRect && layerFragments.size() == 1 && !layerFragments[0].foregroundRect.isEmpty();
     ClipState clipState = HasNotClipped;
-    OwnPtr<ClipRecorder> clipRecorder;
+    OwnPtr<LayerClipRecorder> clipRecorder;
     if (shouldClip && needsToClip(localPaintingInfo, layerFragments[0].foregroundRect)) {
-        clipRecorder = adoptPtr(new ClipRecorder(m_renderLayer.renderer(), context, DisplayItem::ClipLayerForeground, layerFragments[0].foregroundRect, &localPaintingInfo, layerFragments[0].paginationOffset, paintFlags));
+        clipRecorder = adoptPtr(new LayerClipRecorder(m_renderLayer.renderer(), context, DisplayItem::ClipLayerForeground, layerFragments[0].foregroundRect, &localPaintingInfo, layerFragments[0].paginationOffset, paintFlags));
         clipState = HasClipped;
     }
 
     // We have to loop through every fragment multiple times, since we have to issue paint invalidations in each specific phase in order for
     // interleaving of the fragments to work properly.
     paintForegroundForFragmentsWithPhase(selectionOnly ? PaintPhaseSelection : PaintPhaseChildBlockBackgrounds, layerFragments,
         context, localPaintingInfo, paintBehavior, paintingRootForRenderer, paintFlags, clipState);
 
     if (!selectionOnly) {
         paintForegroundForFragmentsWithPhase(PaintPhaseFloat, layerFragments, context, localPaintingInfo, paintBehavior, paintingRootForRenderer, paintFlags, clipState);
@@ skipping 39 matching lines @@
     if (!m_renderLayer.containsDirtyOverlayScrollbars())
         return;
 
     LayerPaintingInfo paintingInfo(&m_renderLayer, enclosingIntRect(damageRect), paintBehavior, LayoutSize(), paintingRoot);
     paintLayer(context, paintingInfo, PaintLayerPaintingOverlayScrollbars);
 
     m_renderLayer.setContainsDirtyOverlayScrollbars(false);
 }
 
 } // namespace blink