chrome/browser/chromeos/extensions/wallpaper_function_base.h

   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_