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 <string>
   9 #include <vector>
  10
  11 #include "ash/desktop_background/desktop_background_controller.h"
  12 #include "components/wallpaper/wallpaper_layout.h"
  13 #include "extensions/browser/extension_function.h"
  14 #include "ui/gfx/image/image_skia.h"
  15
  16 namespace wallpaper_api_util {
  17 extern const char kCancelWallpaperMessage[];
  18 wallpaper::WallpaperLayout GetLayoutEnum(const std::string& layout);
  19 }  // namespace wallpaper_api_util
  20
  21 // Wallpaper manager function base. It contains a image decoder to decode
  22 // wallpaper data.
  23 class WallpaperFunctionBase : public AsyncExtensionFunction {
  24  public:
  25   WallpaperFunctionBase();
  26
  27  protected:
  28   ~WallpaperFunctionBase() override;
  29
  30   // A class to decode JPEG file.
  31   class UnsafeWallpaperDecoder;
  32
  33   // Holds an instance of WallpaperDecoder.
  34   static UnsafeWallpaperDecoder* unsafe_wallpaper_decoder_;
  35
  36   // Starts to decode |data|. Must run on UI thread.
  37   void StartDecode(const std::vector<char>& data);
  38
  39   // Handles cancel case. No error message should be set.
  40   void OnCancel();
  41
  42   // Handles failure case. Sets error message.
  43   void OnFailure(const std::string& error);
  44
  45  private:
  46   virtual void OnWallpaperDecoded(const gfx::ImageSkia& wallpaper) = 0;
  47 };
  48
  49 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_WALLPAPER_FUNCTION_BASE_H_