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 17namespace ash { 18 19class WallpaperResizerObserver; 20 21// Stores the current wallpaper data and resize it to |target_size| if needed. 22class 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(int image_resource_id, 30 const gfx::Size& target_size, 31 WallpaperLayout layout); 32 33 WallpaperResizer(const gfx::ImageSkia& image, 34 const gfx::Size& target_size, 35 WallpaperLayout layout); 36 37 ~WallpaperResizer(); 38 39 const gfx::ImageSkia& image() const { return image_; } 40 uint32_t original_image_id() const { return original_image_id_; } 41 WallpaperLayout layout() const { return layout_; } 42 43 // Called on the UI thread to run Resize() on the worker pool and post an 44 // OnResizeFinished() task back to the UI thread on completion. 45 void StartResize(); 46 47 // Add/Remove observers. 48 void AddObserver(WallpaperResizerObserver* observer); 49 void RemoveObserver(WallpaperResizerObserver* observer); 50 51 private: 52 // Copies |resized_bitmap| to |image_| and notifies observers after Resize() 53 // has finished running. 54 void OnResizeFinished(SkBitmap* resized_bitmap); 55 56 ObserverList<WallpaperResizerObserver> observers_; 57 58 // Image that should currently be used for wallpaper. It initially 59 // contains the original image and is updated to contain the resized 60 // image by OnResizeFinished(). 61 gfx::ImageSkia image_; 62 63 // Unique identifier corresponding to the original (i.e. pre-resize) |image_|. 64 uint32_t original_image_id_; 65 66 gfx::Size target_size_; 67 68 WallpaperLayout layout_; 69 70 base::WeakPtrFactory<WallpaperResizer> weak_ptr_factory_; 71 72 DISALLOW_COPY_AND_ASSIGN(WallpaperResizer); 73}; 74 75} // namespace ash 76 77 78#endif // ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_ 79