cc: Make Picture/PicturePile handle recording/raster

cc/picture_pile.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_PILE_H_
 #define CC_PICTURE_PILE_H_
 
 #include "base/basictypes.h"
 #include "cc/cc_export.h"
 #include "cc/picture.h"
+#include "cc/region.h"
 #include "cc/scoped_ptr_vector.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
 namespace cc {
 
+struct RenderingStats;
+
 class CC_EXPORT PicturePile {
 public:
   PicturePile();
   ~PicturePile();
 
   // Mark a portion of the PicturePile as invalid and needing to be re-recorded
   // the next time update is called.
-  void invalidate(gfx::Rect);
+  void Invalidate(gfx::Rect);
 
   // Resize the PicturePile, invalidating / dropping recorded pictures as necessary.
-  void resize(gfx::Size);
+  void Resize(gfx::Size);
 
-  // Rerecord parts of the picture that are invalid.
-  void update(ContentLayerClient* painter);
+  // Re-record parts of the picture that are invalid.
+  void Update(ContentLayerClient* painter, RenderingStats&);
 
   // Update other with a shallow copy of this (main => compositor thread commit)
-  void pushPropertiesTo(PicturePile& other);
+  void PushPropertiesTo(PicturePile& other);
 
   // Clone a paint-safe version of this picture (with cloned PicturePileRecords)
-  scoped_ptr<PicturePile> cloneForDrawing(gfx::Rect rect);
+  scoped_ptr<PicturePile> CloneForDrawing();
 
   // Raster a subrect of this PicturePile into the given canvas.
   // It's only safe to call paint on a cloned version.
-  void paint(SkCanvas* canvas, gfx::Rect rect);
+  // It is assumed that contentsScale has already been applied to this canvas.
+  void Raster(SkCanvas* canvas, gfx::Rect rect);
 
-protected:
+private:
+  void CopyAllButPile(PicturePile& from, PicturePile& to);
+
   std::vector<scoped_refptr<Picture> > pile_;
   gfx::Size size_;
+  Region invalidation_;
+  Region prev_invalidation_;
 
   DISALLOW_COPY_AND_ASSIGN(PicturePile);
 };
 
 }  // namespace cc
 
 #endif  // CC_PICTURE_PILE_H_