[SPv2] Flatten property trees in PaintRecordBuilder into a single display list.

third_party/WebKit/Source/platform/graphics/paint/PaintArtifact.cpp

 // Copyright 2015 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 "platform/graphics/paint/PaintArtifact.h"
 
+#include "cc/paint/display_item_list.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/graphics/GraphicsLayer.h"
+#include "platform/graphics/compositing/PaintChunksToCcLayer.h"
 #include "platform/graphics/paint/DrawingDisplayItem.h"
+#include "platform/graphics/paint/GeometryMapper.h"
 #include "platform/instrumentation/tracing/TraceEvent.h"
 #include "public/platform/WebDisplayItemList.h"
 #include "third_party/skia/include/core/SkRegion.h"
 
 namespace blink {
 
 namespace {
 
 void computeChunkBoundsAndOpaqueness(const DisplayItemList& displayItems,
                                      Vector<PaintChunk>& paintChunks) {
@@ skipping 54 matching lines @@
 void PaintArtifact::reset() {
   m_displayItemList.clear();
   m_paintChunks.clear();
 }
 
 size_t PaintArtifact::approximateUnsharedMemoryUsage() const {
   return sizeof(*this) + m_displayItemList.memoryUsageInBytes() +
          m_paintChunks.capacity() * sizeof(m_paintChunks[0]);
 }
 
-void PaintArtifact::replay(GraphicsContext& graphicsContext) const {
+void PaintArtifact::replay(const FloatRect& bounds,
+                           GraphicsContext& graphicsContext,
+                           const PropertyTreeState& propertyTreeState) const {
   TRACE_EVENT0("blink,benchmark", "PaintArtifact::replay");
-  for (const DisplayItem& displayItem : m_displayItemList)
-    displayItem.replay(graphicsContext);
+  if (!RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
+    for (const DisplayItem& displayItem : m_displayItemList)
+      displayItem.replay(graphicsContext);
+  } else {
+    std::unique_ptr<GeometryMapper> geometryMapper = GeometryMapper::create();
+    Vector<const PaintChunk*> pointerPaintChunks;

[pdr., 2017/03/28 21:01:30]

To prevent growing and copying this vector, please add:
pointerPaintChunks.reserveInitialCapacity(paintChunks().size());

[chrishtr, 2017/03/28 21:43:23]

Done.

+    for (const auto& chunk : paintChunks())
+      pointerPaintChunks.push_back(&chunk);
+
+    scoped_refptr<cc::DisplayItemList> displayItemList =
+        PaintChunksToCcLayer::convert(pointerPaintChunks, propertyTreeState,
+                                      gfx::Vector2dF(), getDisplayItemList(),
+                                      *geometryMapper);
+    graphicsContext.canvas()->drawDisplayItemList(displayItemList);
+  }
 }
 
 DISABLE_CFI_PERF
 void PaintArtifact::appendToWebDisplayItemList(WebDisplayItemList* list) const {
   TRACE_EVENT0("blink,benchmark", "PaintArtifact::appendToWebDisplayItemList");
   size_t visualRectIndex = 0;
   for (const DisplayItem& displayItem : m_displayItemList) {
     displayItem.appendToWebDisplayItemList(
         m_displayItemList.visualRect(visualRectIndex), list);
     visualRectIndex++;
   }
   list->setIsSuitableForGpuRasterization(isSuitableForGpuRasterization());
 }
 
 }  // namespace blink