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| 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2010 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 #pragma once | 7 #pragma once |
| 8 | 8 |
| 9 #include "third_party/skia/include/core/SkColor.h" | 9 #include "ui/gfx/color_utils.h" |
| 10 | 10 // TODO(sail): remove this file once all includes have been updated. |
| 11 class SkBitmap; | |
| 12 | |
| 13 namespace color_utils { | |
| 14 | |
| 15 // Represents an HSL color. | |
| 16 struct HSL { | |
| 17 double h; | |
| 18 double s; | |
| 19 double l; | |
| 20 }; | |
| 21 | |
| 22 // Calculated according to http://www.w3.org/TR/WCAG20/#relativeluminancedef | |
| 23 double RelativeLuminance(SkColor color); | |
| 24 | |
| 25 // Note: these transformations assume sRGB as the source color space | |
| 26 void SkColorToHSL(SkColor c, HSL* hsl); | |
| 27 SkColor HSLToSkColor(const HSL& hsl, SkAlpha alpha); | |
| 28 | |
| 29 // HSL-Shift an SkColor. The shift values are in the range of 0-1, with the | |
| 30 // option to specify -1 for 'no change'. The shift values are defined as: | |
| 31 // hsl_shift[0] (hue): The absolute hue value - 0 and 1 map | |
| 32 // to 0 and 360 on the hue color wheel (red). | |
| 33 // hsl_shift[1] (saturation): A saturation shift, with the | |
| 34 // following key values: | |
| 35 // 0 = remove all color. | |
| 36 // 0.5 = leave unchanged. | |
| 37 // 1 = fully saturate the image. | |
| 38 // hsl_shift[2] (lightness): A lightness shift, with the | |
| 39 // following key values: | |
| 40 // 0 = remove all lightness (make all pixels black). | |
| 41 // 0.5 = leave unchanged. | |
| 42 // 1 = full lightness (make all pixels white). | |
| 43 SkColor HSLShift(SkColor color, const HSL& shift); | |
| 44 | |
| 45 // Determine if a given alpha value is nearly completely transparent. | |
| 46 bool IsColorCloseToTransparent(SkAlpha alpha); | |
| 47 | |
| 48 // Determine if a color is near grey. | |
| 49 bool IsColorCloseToGrey(int r, int g, int b); | |
| 50 | |
| 51 // Gets a color representing a bitmap. The definition of "representing" is the | |
| 52 // average color in the bitmap. The color returned is modified to have the | |
| 53 // specified alpha. | |
| 54 SkColor GetAverageColorOfFavicon(SkBitmap* bitmap, SkAlpha alpha); | |
| 55 | |
| 56 // Builds a histogram based on the Y' of the Y'UV representation of | |
| 57 // this image. | |
| 58 void BuildLumaHistogram(SkBitmap* bitmap, int histogram[256]); | |
| 59 | |
| 60 // Returns a blend of the supplied colors, ranging from |background| (for | |
| 61 // |alpha| == 0) to |foreground| (for |alpha| == 255). The alpha channels of | |
| 62 // the supplied colors are also taken into account, so the returned color may | |
| 63 // be partially transparent. | |
| 64 SkColor AlphaBlend(SkColor foreground, SkColor background, SkAlpha alpha); | |
| 65 | |
| 66 // Given a foreground and background color, try to return a foreground color | |
| 67 // that is "readable" over the background color by luma-inverting the foreground | |
| 68 // color and then picking whichever foreground color has higher contrast against | |
| 69 // the background color. | |
| 70 // | |
| 71 // NOTE: This won't do anything but waste time if the supplied foreground color | |
| 72 // has a luma value close to the midpoint (0.5 in the HSL representation). | |
| 73 SkColor GetReadableColor(SkColor foreground, SkColor background); | |
| 74 | |
| 75 // Gets a Windows system color as a SkColor | |
| 76 SkColor GetSysSkColor(int which); | |
| 77 | |
| 78 } // namespace color_utils | |
| 79 | 11 |
| 80 #endif // APP_GFX_COLOR_UTILS_H_ | 12 #endif // APP_GFX_COLOR_UTILS_H_ |
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