1 files changed, 78 insertions, 0 deletions
diff --git a/chromium/ash/desktop_background/wallpaper_resizer.h b/chromium/ash/desktop_background/wallpaper_resizer.h
new file mode 100644
index 00000000000..fadfb445f0d
--- /dev/null
+++ b/chromium/ash/desktop_background/wallpaper_resizer.h
@@ -0,0 +1,78 @@
+// 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(int image_resource_id,
+                   const gfx::Size& target_size,
+                   WallpaperLayout layout);
+
+  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_