1 // Copyright (c) 2013 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 ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_ 6 #define ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_ 7 8 #include "ash/ash_export.h" 9 #include "ash/desktop_background/desktop_background_controller.h" 10 #include "base/memory/weak_ptr.h" 11 #include "base/observer_list.h" 12 #include "skia/ext/image_operations.h" 13 #include "third_party/skia/include/core/SkBitmap.h" 14 #include "ui/gfx/image/image_skia.h" 15 #include "ui/gfx/size.h" 16 17 namespace ash { 18 19 class WallpaperResizerObserver; 20 21 // Stores the current wallpaper data and resize it to |target_size| if needed. 22 class ASH_EXPORT WallpaperResizer { 23 public: 24 // Returns a unique identifier corresponding to |image|, suitable for 25 // comparison against the value returned by original_image_id(). If the image 26 // is modified, its ID will change. 27 static uint32_t GetImageId(const gfx::ImageSkia& image); 28 29 WallpaperResizer(const gfx::ImageSkia& image, 30 const gfx::Size& target_size, 31 WallpaperLayout layout); 32 33 ~WallpaperResizer(); 34 image()35 const gfx::ImageSkia& image() const { return image_; } original_image_id()36 uint32_t original_image_id() const { return original_image_id_; } layout()37 WallpaperLayout layout() const { return layout_; } 38 39 // Called on the UI thread to run Resize() on the worker pool and post an 40 // OnResizeFinished() task back to the UI thread on completion. 41 void StartResize(); 42 43 // Add/Remove observers. 44 void AddObserver(WallpaperResizerObserver* observer); 45 void RemoveObserver(WallpaperResizerObserver* observer); 46 47 private: 48 // Copies |resized_bitmap| to |image_| and notifies observers after Resize() 49 // has finished running. 50 void OnResizeFinished(SkBitmap* resized_bitmap); 51 52 ObserverList<WallpaperResizerObserver> observers_; 53 54 // Image that should currently be used for wallpaper. It initially 55 // contains the original image and is updated to contain the resized 56 // image by OnResizeFinished(). 57 gfx::ImageSkia image_; 58 59 // Unique identifier corresponding to the original (i.e. pre-resize) |image_|. 60 uint32_t original_image_id_; 61 62 gfx::Size target_size_; 63 64 WallpaperLayout layout_; 65 66 base::WeakPtrFactory<WallpaperResizer> weak_ptr_factory_; 67 68 DISALLOW_COPY_AND_ASSIGN(WallpaperResizer); 69 }; 70 71 } // namespace ash 72 73 74 #endif // ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_ 75