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1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef APP_GFX_COLOR_UTILS_H_ | 5 #ifndef APP_GFX_COLOR_UTILS_H_ |
6 #define APP_GFX_COLOR_UTILS_H_ | 6 #define APP_GFX_COLOR_UTILS_H_ |
7 | 7 |
8 #include "third_party/skia/include/core/SkColor.h" | 8 #include "third_party/skia/include/core/SkColor.h" |
9 | 9 |
10 class SkBitmap; | 10 class SkBitmap; |
11 | 11 |
12 namespace color_utils { | 12 namespace color_utils { |
13 | 13 |
14 // Represents set of CIE XYZ tristimulus values. | |
15 struct CIE_XYZ { | |
16 double X; | |
17 double Y; // luminance | |
18 double Z; | |
19 }; | |
20 | |
21 // Represents a L*a*b* color value | |
22 struct LabColor { | |
23 int L; | |
24 int a; | |
25 int b; | |
26 }; | |
27 | |
28 // Note: these transformations assume sRGB as the source color space | |
29 | |
30 // Convert between different color spaces | |
31 void SkColorToCIEXYZ(SkColor c, CIE_XYZ* xyz); | |
32 SkColor CIEXYZToSkColor(SkAlpha alpha, const CIE_XYZ& xyz); | |
33 | |
34 void SkColorToLabColor(SkColor c, LabColor* lab); | |
35 SkColor LabColorToSkColor(const LabColor& lab, SkAlpha alpha); | |
36 | |
37 void CIEXYZToLabColor(const CIE_XYZ& xyz, LabColor* lab); | |
38 void LabColorToCIEXYZ(const LabColor& lab, CIE_XYZ* xyz); | |
39 | |
40 // Determine if a given alpha value is nearly completely transparent. | 14 // Determine if a given alpha value is nearly completely transparent. |
41 bool IsColorCloseToTransparent(SkAlpha alpha); | 15 bool IsColorCloseToTransparent(SkAlpha alpha); |
42 | 16 |
43 // Determine if a color is near grey. | 17 // Determine if a color is near grey. |
44 bool IsColorCloseToGrey(int r, int g, int b); | 18 bool IsColorCloseToGrey(int r, int g, int b); |
45 | 19 |
46 // Gets a color representing a bitmap. The definition of "representing" is the | 20 // Gets a color representing a bitmap. The definition of "representing" is the |
47 // average color in the bitmap. The color returned is modified to have the | 21 // average color in the bitmap. The color returned is modified to have the |
48 // specified alpha. | 22 // specified alpha. |
49 SkColor GetAverageColorOfFavicon(SkBitmap* bitmap, SkAlpha alpha); | 23 SkColor GetAverageColorOfFavicon(SkBitmap* bitmap, SkAlpha alpha); |
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61 SkColor PickMoreReadableColor(SkColor foreground1, | 35 SkColor PickMoreReadableColor(SkColor foreground1, |
62 SkColor foreground2, | 36 SkColor foreground2, |
63 SkColor background); | 37 SkColor background); |
64 | 38 |
65 // Gets a Windows system color as a SkColor | 39 // Gets a Windows system color as a SkColor |
66 SkColor GetSysSkColor(int which); | 40 SkColor GetSysSkColor(int which); |
67 | 41 |
68 } // namespace color_utils | 42 } // namespace color_utils |
69 | 43 |
70 #endif // APP_GFX_COLOR_UTILS_H_ | 44 #endif // APP_GFX_COLOR_UTILS_H_ |
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