Draw recorded content directly into the containing PaintCanvas, when possible.

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"
@@ skipping 67 matching lines @@
   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(const FloatRect& bounds,
-                           GraphicsContext& graphicsContext,
-                           const PropertyTreeState& replayState) const {
+                           GraphicsContext& graphicsContext) const {
   TRACE_EVENT0("blink,benchmark", "PaintArtifact::replay");
   if (!RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
     for (const DisplayItem& displayItem : m_displayItemList)
       displayItem.replay(graphicsContext);
   } else {
-    std::unique_ptr<GeometryMapper> geometryMapper = GeometryMapper::create();
-    Vector<const PaintChunk*> pointerPaintChunks;
-    pointerPaintChunks.reserveInitialCapacity(paintChunks().size());
+    replay(bounds, *graphicsContext.canvas());
+  }
+}
 
-    // TODO(chrishtr): it's sad to have to copy this vector just to turn
-    // references into pointers.
-    for (const auto& chunk : paintChunks())
-      pointerPaintChunks.push_back(&chunk);
-    scoped_refptr<cc::DisplayItemList> displayItemList =
-        PaintChunksToCcLayer::convert(pointerPaintChunks, replayState,
-                                      gfx::Vector2dF(), getDisplayItemList(),
-                                      *geometryMapper);
-    graphicsContext.canvas()->drawDisplayItemList(displayItemList);
-  }
+void PaintArtifact::replay(const FloatRect& bounds,
+                           PaintCanvas& canvas,
+                           const PropertyTreeState& replayState) const {
+  TRACE_EVENT0("blink,benchmark", "PaintArtifact::replay");
+  DCHECK(RuntimeEnabledFeatures::slimmingPaintV2Enabled());
+  std::unique_ptr<GeometryMapper> geometryMapper = GeometryMapper::create();
+  Vector<const PaintChunk*> pointerPaintChunks;
+  pointerPaintChunks.reserveInitialCapacity(paintChunks().size());
+
+  // TODO(chrishtr): it's sad to have to copy this vector just to turn
+  // references into pointers.
+  for (const auto& chunk : paintChunks())
+    pointerPaintChunks.push_back(&chunk);
+  scoped_refptr<cc::DisplayItemList> displayItemList =
+      PaintChunksToCcLayer::convert(pointerPaintChunks, replayState,
+                                    gfx::Vector2dF(), getDisplayItemList(),
+                                    *geometryMapper);
+  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