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.
5 #ifndef ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_
6 #define ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_
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"
19 class WallpaperResizerObserver;
21 // Stores the current wallpaper data and resize it to |target_size| if needed.
22 class ASH_EXPORT WallpaperResizer {
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);
29 WallpaperResizer(int image_resource_id,
30 const gfx::Size& target_size,
31 WallpaperLayout layout);
33 WallpaperResizer(const gfx::ImageSkia& image,
34 const gfx::Size& target_size,
35 WallpaperLayout layout);
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_; }
43 int resource_id() const { return resource_id_; }
45 // Called on the UI thread to run Resize() on the worker pool and post an
46 // OnResizeFinished() task back to the UI thread on completion.
49 // Add/Remove observers.
50 void AddObserver(WallpaperResizerObserver* observer);
51 void RemoveObserver(WallpaperResizerObserver* observer);
54 // Copies |resized_bitmap| to |image_| and notifies observers after Resize()
55 // has finished running.
56 void OnResizeFinished(SkBitmap* resized_bitmap);
58 ObserverList<WallpaperResizerObserver> observers_;
60 // Image that should currently be used for wallpaper. It initially
61 // contains the original image and is updated to contain the resized
62 // image by OnResizeFinished().
63 gfx::ImageSkia image_;
65 // Unique identifier corresponding to the original (i.e. pre-resize) |image_|.
66 uint32_t original_image_id_;
68 // kInvalidResourceID if image was not obtained from resources.
69 const int resource_id_;
71 gfx::Size target_size_;
73 WallpaperLayout layout_;
75 base::WeakPtrFactory<WallpaperResizer> weak_ptr_factory_;
77 DISALLOW_COPY_AND_ASSIGN(WallpaperResizer);
83 #endif // ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_