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      1 // Copyright 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 CHROME_BROWSER_CHROMEOS_EXTENSIONS_WALLPAPER_FUNCTION_BASE_H_
      6 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_WALLPAPER_FUNCTION_BASE_H_
      7 
      8 #include "ash/desktop_background/desktop_background_controller.h"
      9 #include "extensions/browser/extension_function.h"
     10 #include "ui/gfx/image/image_skia.h"
     11 
     12 namespace wallpaper_api_util {
     13 extern const char kCancelWallpaperMessage[];
     14 ash::WallpaperLayout GetLayoutEnum(const std::string& layout);
     15 }  // namespace wallpaper_api_util
     16 
     17 // Wallpaper manager function base. It contains a image decoder to decode
     18 // wallpaper data.
     19 class WallpaperFunctionBase : public AsyncExtensionFunction {
     20  public:
     21   WallpaperFunctionBase();
     22 
     23  protected:
     24   virtual ~WallpaperFunctionBase();
     25 
     26   // A class to decode JPEG file.
     27   class UnsafeWallpaperDecoder;
     28 
     29   // Holds an instance of WallpaperDecoder.
     30   static UnsafeWallpaperDecoder* unsafe_wallpaper_decoder_;
     31 
     32   // Starts to decode |data|. Must run on UI thread.
     33   void StartDecode(const std::string& data);
     34 
     35   // Handles cancel case. No error message should be set.
     36   void OnCancel();
     37 
     38   // Handles failure case. Sets error message.
     39   void OnFailure(const std::string& error);
     40 
     41  private:
     42   virtual void OnWallpaperDecoded(const gfx::ImageSkia& wallpaper) = 0;
     43 };
     44 
     45 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_WALLPAPER_FUNCTION_BASE_H_
     46