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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_
#define ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_
#include "ash/ash_export.h"
#include "ash/desktop_background/desktop_background_controller.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "skia/ext/image_operations.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/size.h"
namespace ash {
class WallpaperResizerObserver;
// Stores the current wallpaper data and resize it to |target_size| if needed.
class ASH_EXPORT WallpaperResizer {
public:
// Returns a unique identifier corresponding to |image|, suitable for
// comparison against the value returned by original_image_id(). If the image
// is modified, its ID will change.
static uint32_t GetImageId(const gfx::ImageSkia& image);
WallpaperResizer(const gfx::ImageSkia& image,
const gfx::Size& target_size,
WallpaperLayout layout);
~WallpaperResizer();
const gfx::ImageSkia& image() const { return image_; }
uint32_t original_image_id() const { return original_image_id_; }
WallpaperLayout layout() const { return layout_; }
// Called on the UI thread to run Resize() on the worker pool and post an
// OnResizeFinished() task back to the UI thread on completion.
void StartResize();
// Add/Remove observers.
void AddObserver(WallpaperResizerObserver* observer);
void RemoveObserver(WallpaperResizerObserver* observer);
private:
// Copies |resized_bitmap| to |image_| and notifies observers after Resize()
// has finished running.
void OnResizeFinished(SkBitmap* resized_bitmap);
ObserverList<WallpaperResizerObserver> observers_;
// Image that should currently be used for wallpaper. It initially
// contains the original image and is updated to contain the resized
// image by OnResizeFinished().
gfx::ImageSkia image_;
// Unique identifier corresponding to the original (i.e. pre-resize) |image_|.
uint32_t original_image_id_;
gfx::Size target_size_;
WallpaperLayout layout_;
base::WeakPtrFactory<WallpaperResizer> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(WallpaperResizer);
};
} // namespace ash
#endif // ASH_DESKTOP_BACKGROUND_DESKTOP_WALLPAPER_RESIZER_H_
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