Implements core logic for Pixel Canvas

ui/compositor/paint_recorder.h

 // 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.
 
 #ifndef UI_COMPOSITOR_PAINT_RECORDER_H_
 #define UI_COMPOSITOR_PAINT_RECORDER_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "cc/paint/record_paint_canvas.h"
 #include "ui/compositor/compositor_export.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace gfx {
 class Canvas;
 }
 
 namespace ui {
 class PaintCache;
 class PaintContext;
+class PaintInfo;
 
 // A class to hide the complexity behind setting up a recording into a
 // DisplayItem. This is meant to be short-lived within the scope of recording
 // taking place, the DisplayItem should be removed from the PaintRecorder once
 // recording is complete and can be cached.
 class COMPOSITOR_EXPORT PaintRecorder {
  public:
   // The |cache| is owned by the caller and must be kept alive while
   // PaintRecorder is in use. Canvas is bounded by |recording_size|.
-  PaintRecorder(const PaintContext& context,
-                const gfx::Size& recording_size,
-                PaintCache* cache);
+  // TODO(malaykeshav): |recording_size| is now redundant and can be removed
+  // since context already has size information.
+  PaintRecorder(const PaintInfo& info, PaintCache* cache);
   PaintRecorder(const PaintContext& context, const gfx::Size& recording_size);
   ~PaintRecorder();
 
   // Gets a gfx::Canvas for painting into.
   gfx::Canvas* canvas() { return &canvas_; }
 
  private:
   const PaintContext& context_;
   cc::RecordPaintCanvas record_canvas_;
   gfx::Canvas canvas_;
   PaintCache* cache_;
   gfx::Size recording_size_;
+  bool is_pixel_canvas_;
 
   DISALLOW_COPY_AND_ASSIGN(PaintRecorder);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_PAINT_RECORDER_H_