Blink-side contiguous allocation of display items.

Source/platform/graphics/paint/DrawingDisplayItem.h

 // 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.
 
 #ifndef DrawingDisplayItem_h
 #define DrawingDisplayItem_h
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/FloatPoint.h"
 #include "platform/graphics/paint/DisplayItem.h"
 #include "third_party/skia/include/core/SkPicture.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
 class PLATFORM_EXPORT DrawingDisplayItem : public DisplayItem {
 public:
 #if ENABLE(ASSERT)
     enum UnderInvalidationCheckingMode {
         CheckPicture, // Check if the new picture and the old picture are the same
         CheckBitmap, // Check if the new picture and the old picture produce the same bitmap
     };
 #endif
 
     DrawingDisplayItem(const DisplayItemClientWrapper& client, Type type, PassRefPtr<const SkPicture> picture)
         : DisplayItem(client, type)
         , m_picture(picture && picture->approximateOpCount() ? picture : nullptr)
-#if ENABLE(ASSERT)
-        , m_underInvalidationCheckingMode(CheckPicture)
-#endif
     {
         ASSERT(isDrawingType(type));
     }
 
-    static PassOwnPtr<DrawingDisplayItem> create(const DisplayItemClientWrapper& client, Type type, PassRefPtr<const SkPicture> picture)
+#if ENABLE(ASSERT)
+    DrawingDisplayItem(const DisplayItemClientWrapper& client, Type type, PassRefPtr<const SkPicture> picture, UnderInvalidationCheckingMode underInvalidationCheckingMode)
+        : DisplayItem(client, type)
+        , m_picture(picture && picture->approximateOpCount() ? picture : nullptr)
+        , m_underInvalidationCheckingMode(underInvalidationCheckingMode)
     {
-        return adoptPtr(new DrawingDisplayItem(client, type, picture));
+        ASSERT(isDrawingType(type));
     }
+#endif
 
-    virtual void replay(GraphicsContext&);
-    virtual void appendToWebDisplayItemList(WebDisplayItemList*) const override;
-    virtual bool drawsContent() const override;
+    void replay(GraphicsContext&) override;
+    void appendToWebDisplayItemList(WebDisplayItemList*) const override;
+    void appendByMoving(DisplayItems&) override;
+    bool drawsContent() const override;
 
     const SkPicture* picture() const { return m_picture.get(); }
 
 #if ENABLE(ASSERT)
     void setUnderInvalidationCheckingMode(UnderInvalidationCheckingMode mode) { m_underInvalidationCheckingMode = mode; }
     UnderInvalidationCheckingMode underInvalidationCheckingMode() const { return m_underInvalidationCheckingMode; }
 #endif
 
 private:
 #ifndef NDEBUG
     virtual void dumpPropertiesAsDebugString(WTF::StringBuilder&) const override;
 #endif
 
     RefPtr<const SkPicture> m_picture;
 
 #if ENABLE(ASSERT)
     UnderInvalidationCheckingMode m_underInvalidationCheckingMode;
 #endif
 };
 
 } // namespace blink
 
 #endif // DrawingDisplayItem_h