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