| // Copyright 2017 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 COMPONENTS_WALLPAPER_WALLPAPER_COLOR_CALCULATOR_H_ |
| #define COMPONENTS_WALLPAPER_WALLPAPER_COLOR_CALCULATOR_H_ |
| |
| #include "base/macros.h" |
| #include "base/memory/ref_counted.h" |
| #include "base/memory/weak_ptr.h" |
| #include "base/observer_list.h" |
| #include "base/time/time.h" |
| #include "components/wallpaper/wallpaper_export.h" |
| #include "third_party/skia/include/core/SkColor.h" |
| #include "ui/gfx/color_analysis.h" |
| #include "ui/gfx/image/image_skia.h" |
| |
| namespace base { |
| class TaskRunner; |
| } |
| |
| namespace wallpaper { |
| class WallpaperColorCalculatorObserver; |
| |
| // Calculates colors based on a wallpaper image. |
| class WALLPAPER_EXPORT WallpaperColorCalculator { |
| public: |
| // |image|, |luma| and |saturation| are the input parameters to the color |
| // calculation that is executed on the |task_runner|. |
| WallpaperColorCalculator(const gfx::ImageSkia& image, |
| color_utils::LumaRange luma, |
| color_utils::SaturationRange saturation, |
| scoped_refptr<base::TaskRunner> task_runner); |
| ~WallpaperColorCalculator(); |
| |
| void AddObserver(WallpaperColorCalculatorObserver* observer); |
| |
| void RemoveObserver(WallpaperColorCalculatorObserver* observer); |
| |
| // Initiates the calculation and returns false if the calculation fails to be |
| // initiated. Observers may be notified synchronously or asynchronously. |
| // Callers should be aware that this will make |image_| read-only. |
| bool StartCalculation() WARN_UNUSED_RESULT; |
| |
| SkColor prominent_color() const { return prominent_color_; } |
| |
| void set_prominent_color_for_test(SkColor prominent_color) { |
| prominent_color_ = prominent_color; |
| } |
| |
| // Explicitly sets the |task_runner_| for testing. |
| void SetTaskRunnerForTest(scoped_refptr<base::TaskRunner> task_runner); |
| |
| private: |
| // Handles asynchronous calculation results. |async_start_time| is used to |
| // record duration metrics. |
| void OnAsyncCalculationComplete(base::TimeTicks async_start_time, |
| SkColor prominent_color); |
| |
| // Notifies observers that a color calulation has completed. Called on the |
| // same thread that constructed |this|. |
| void NotifyCalculationComplete(SkColor prominent_color); |
| |
| // The result of the color calculation. |
| SkColor prominent_color_ = SK_ColorTRANSPARENT; |
| |
| // The image to calculate colors from. |
| gfx::ImageSkia image_; |
| |
| // Input for the color calculation. |
| color_utils::LumaRange luma_; |
| |
| // Input for the color calculation. |
| color_utils::SaturationRange saturation_; |
| |
| // The task runner to run the calculation on. |
| scoped_refptr<base::TaskRunner> task_runner_; |
| |
| base::ObserverList<WallpaperColorCalculatorObserver> observers_; |
| |
| base::WeakPtrFactory<WallpaperColorCalculator> weak_ptr_factory_; |
| |
| DISALLOW_COPY_AND_ASSIGN(WallpaperColorCalculator); |
| }; |
| |
| } // namespace wallpaper |
| |
| #endif // COMPONENTS_WALLPAPER_WALLPAPER_COLOR_CALCULATOR_H_ |