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1 // Copyright 2017 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 COMPONENTS_WALLPAPER_COLOR_CALCULATOR_H_ | |
bshe
2017/02/24 18:30:36
nit: should this be COMPONENTS_WALLPAPER_WALLPAPER
bruthig
2017/02/25 17:51:18
Done.
| |
6 #define COMPONENTS_WALLPAPER_COLOR_CALCULATOR_H_ | |
7 | |
8 #include "base/macros.h" | |
9 #include "base/memory/ref_counted.h" | |
10 #include "base/memory/weak_ptr.h" | |
11 #include "base/observer_list.h" | |
12 #include "components/wallpaper/wallpaper_color_calculator_observer.h" | |
13 #include "components/wallpaper/wallpaper_export.h" | |
14 #include "third_party/skia/include/core/SkColor.h" | |
15 #include "ui/gfx/color_analysis.h" | |
16 #include "ui/gfx/image/image_skia.h" | |
17 | |
18 namespace base { | |
19 class TaskRunner; | |
20 } | |
21 | |
22 namespace wallpaper { | |
23 class WallpaperColorCalculatorObserver; | |
24 | |
25 // Asynchronously calculates colors based on a wallpaper image. | |
26 class WALLPAPER_EXPORT WallpaperColorCalculator { | |
27 public: | |
28 // |image|, |luma| and |saturation| are the input parameters to the color | |
29 // calculation that is executed on the |task_runner|. | |
30 WallpaperColorCalculator(const gfx::ImageSkia& image, | |
31 color_utils::LumaRange luma, | |
32 color_utils::SaturationRange saturation, | |
33 scoped_refptr<base::TaskRunner> task_runner); | |
34 ~WallpaperColorCalculator(); | |
35 | |
36 void AddObserver(WallpaperColorCalculatorObserver* observer); | |
37 | |
38 void RemoveObserver(WallpaperColorCalculatorObserver* observer); | |
39 | |
40 // Initiates the calculation and returns false if the calculation fails to be | |
41 // initiated. Callers should be aware that this will make |image_| read-only. | |
42 bool StartCalculation() WARN_UNUSED_RESULT; | |
43 | |
44 SkColor prominent_color() const { return prominent_color_; } | |
45 | |
46 void set_prominent_color_for_test(SkColor prominent_color) { | |
47 prominent_color_ = prominent_color; | |
48 } | |
49 | |
50 // Explicitly sets the |task_runner_| for testing. | |
51 void SetTaskRunnerForTest(scoped_refptr<base::TaskRunner> task_runner); | |
52 | |
53 private: | |
54 // Notifies observers that a color calulation has completed. Called on the | |
55 // same thread that constructed |this|. | |
56 void NotifyCalculationComplete(SkColor prominent_color); | |
57 | |
58 // The result of the color calculation. | |
59 SkColor prominent_color_ = SK_ColorTRANSPARENT; | |
60 | |
61 // The image to calculate colors from. | |
62 gfx::ImageSkia image_; | |
63 | |
64 // Input for the color calculation. | |
65 color_utils::LumaRange luma_; | |
66 | |
67 // Input for the color calculation. | |
68 color_utils::SaturationRange saturation_; | |
69 | |
70 // The task runner to run the calculation on. | |
71 scoped_refptr<base::TaskRunner> task_runner_; | |
72 | |
73 base::ObserverList<WallpaperColorCalculatorObserver> observers_; | |
74 | |
75 base::WeakPtrFactory<WallpaperColorCalculator> weak_ptr_factory_; | |
76 | |
77 DISALLOW_COPY_AND_ASSIGN(WallpaperColorCalculator); | |
78 }; | |
79 | |
80 } // namespace wallpaper | |
81 | |
82 #endif // COMPONENTS_WALLPAPER_COLOR_CALCULATOR_H_ | |
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