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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   WallpaperResizer(int image_resource_id,
     25                    const gfx::Size& target_size,
     26                    WallpaperLayout layout);
     27 
     28   WallpaperResizer(const gfx::ImageSkia& image,
     29                    const gfx::Size& target_size,
     30                    WallpaperLayout layout);
     31 
     32   ~WallpaperResizer();
     33 
     34   const gfx::ImageSkia& wallpaper_image() const { return wallpaper_image_; }
     35   const WallpaperLayout layout() const { return layout_; }
     36 
     37   // Called on the UI thread to run Resize() on the worker pool and post an
     38   // OnResizeFinished() task back to the UI thread on completion.
     39   void StartResize();
     40 
     41   // Add/Remove observers.
     42   void AddObserver(WallpaperResizerObserver* observer);
     43   void RemoveObserver(WallpaperResizerObserver* observer);
     44 
     45  private:
     46   // Copies |resized_bitmap| to |wallpaper_image_| and notifies observers
     47   // after Resize() has finished running.
     48   void OnResizeFinished(SkBitmap* resized_bitmap);
     49 
     50   ObserverList<WallpaperResizerObserver> observers_;
     51 
     52   // Image that should currently be used for wallpaper. It initially
     53   // contains the original image and is updated to contain the resized
     54   // image by OnResizeFinished().
     55   gfx::ImageSkia wallpaper_image_;
     56 
     57   gfx::Size target_size_;
     58 
     59   WallpaperLayout layout_;
     60 
     61   base::WeakPtrFactory<WallpaperResizer> weak_ptr_factory_;
     62 
     63   DISALLOW_COPY_AND_ASSIGN(WallpaperResizer);
     64 };
     65 
     66 }  // namespace ash
     67 
     68 
     69 #endif  // ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_
     70