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 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. size()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: ~CanvasImageSource()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