1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef UI_GFX_IMAGE_CANVAS_IMAGE_SOURCE_H_
6#define UI_GFX_IMAGE_CANVAS_IMAGE_SOURCE_H_
7
8#include "base/basictypes.h"
9#include "base/compiler_specific.h"
10#include "ui/gfx/gfx_export.h"
11#include "ui/gfx/image/image_skia_source.h"
12#include "ui/gfx/size.h"
13
14namespace gfx {
15class Canvas;
16class ImageSkiaRep;
17
18// CanvasImageSource is useful if you need to generate an image for
19// a scale factor using gfx::Canvas. It creates a new Canvas
20// with target scale factor and generates ImageSkiaRep when drawing is
21// completed.
22class GFX_EXPORT CanvasImageSource : public gfx::ImageSkiaSource {
23 public:
24  CanvasImageSource(const gfx::Size& size, bool is_opaque);
25
26  // Called when a new image needs to be drawn for a scale factor.
27  virtual void Draw(gfx::Canvas* canvas) = 0;
28
29  // Returns the size of images in DIP that this source will generate.
30  const gfx::Size& size() const { return size_; };
31
32  // Overridden from gfx::ImageSkiaSource.
33  virtual gfx::ImageSkiaRep GetImageForScale(float scale) OVERRIDE;
34
35 protected:
36  virtual ~CanvasImageSource() {}
37
38  const gfx::Size size_;
39  const bool is_opaque_;
40  DISALLOW_COPY_AND_ASSIGN(CanvasImageSource);
41};
42
43}  // namespace gfx
44
45#endif  // UI_GFX_IMAGE_CANVAS_IMAGE_SOURCE_H_
46