ui/gfx/image/canvas_image_source.h

   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/geometry/size.h"
  11 #include "ui/gfx/gfx_export.h"
  12 #include "ui/gfx/image/image_skia_source.h"
  13
  14 namespace gfx {
  15 class Canvas;
  16 class 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.
  22 class 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   gfx::ImageSkiaRep GetImageForScale(float scale) override;
  34
  35  protected:
  36   ~CanvasImageSource() override {}
  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_