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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(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 
image()39   const gfx::ImageSkia& image() const { return image_; }
original_image_id()40   uint32_t original_image_id() const { return original_image_id_; }
layout()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