cc: Make Picture/PicturePile handle recording/raster

cc/picture.h

 // Copyright 2012 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 CC_PICTURE_H_
 #define CC_PICTURE_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "cc/cc_export.h"
 #include "third_party/skia/include/core/SkPicture.h"
 #include "ui/gfx/rect.h"
 
 namespace cc {
 
 class ContentLayerClient;
+struct RenderingStats;
 
 class CC_EXPORT Picture
     : public base::RefCountedThreadSafe<Picture> {
 public:
-  scoped_refptr<Picture> create(ContentLayerClient*, gfx::Rect);
+  static scoped_refptr<Picture> Create();
 
-  const gfx::Rect& rect();
-  scoped_refptr<Picture> clone();
+  const gfx::Rect& LayerRect() const { return layer_rect_; }
+  const gfx::Rect& OpaqueRect() const { return opaque_rect_; }
 
-protected:
+  // Make a thread-safe clone for rasterizing with.
+  scoped_refptr<Picture> Clone();
+
+  // Record a paint operation (clobbering any previous recording).
+  void Record(ContentLayerClient*, gfx::Rect layer_rect, RenderingStats&);
+
+  // Raster this Picture's layer_rect into the given canvas.
+  // Assumes contentsScale have already been applied.
+  void Raster(SkCanvas* canvas);
+
+private:
   Picture();
+  // This constructor assumes SkPicture is already ref'd and transfers
+  // ownership to this picture.
+  Picture(SkPicture*, gfx::Rect layer_rect, gfx::Rect opaque_rect);
   ~Picture();
 
-  gfx::Rect m_rect;
-  SkPicture m_picture;
+  gfx::Rect layer_rect_;
+  gfx::Rect opaque_rect_;
+  SkAutoTUnref<SkPicture> picture_;
 
-private:
   friend class base::RefCountedThreadSafe<Picture>;
-
   DISALLOW_COPY_AND_ASSIGN(Picture);
 };
 
 }  // namespace cc
 
 #endif  // CC_PICTURE_H_