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 "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "skia/ext/refptr.h"
#include "ui/compositor/compositor_export.h"
#include "ui/gfx/canvas.h"

namespace cc {
class DisplayItemList;
}

namespace gfx {
class Canvas;
}

class SkCanvas;
class SkPictureRecorder;

namespace ui {
class PaintCache;
class PaintContext;

// 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.
  PaintRecorder(const PaintContext& context, PaintCache* cache);
  explicit PaintRecorder(const PaintContext& context);
  ~PaintRecorder();

  // Gets a gfx::Canvas for painting into.
  gfx::Canvas* canvas() { return canvas_; }

 private:
  const PaintContext& context_;
  gfx::Canvas owned_canvas_;
  gfx::Canvas* canvas_;
  PaintCache* cache_;

  DISALLOW_COPY_AND_ASSIGN(PaintRecorder);
};

}  // namespace ui

#endif  // UI_COMPOSITOR_PAINT_RECORDER_H_