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Side by Side Diff: ui/gfx/color_utils.h

Issue 11418280: Remove unused function from color_utils. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 8 years ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2012 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 UI_GFX_COLOR_UTILS_H_ 5 #ifndef UI_GFX_COLOR_UTILS_H_
6 #define UI_GFX_COLOR_UTILS_H_ 6 #define UI_GFX_COLOR_UTILS_H_
7 7
8 #include "base/basictypes.h" 8 #include "base/basictypes.h"
9 #include "third_party/skia/include/core/SkColor.h" 9 #include "third_party/skia/include/core/SkColor.h"
10 #include "ui/base/ui_export.h" 10 #include "ui/base/ui_export.h"
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44 // 0.5 = leave unchanged. 44 // 0.5 = leave unchanged.
45 // 1 = full lightness (make all pixels white). 45 // 1 = full lightness (make all pixels white).
46 UI_EXPORT SkColor HSLShift(SkColor color, const HSL& shift); 46 UI_EXPORT SkColor HSLShift(SkColor color, const HSL& shift);
47 47
48 // Determine if a given alpha value is nearly completely transparent. 48 // Determine if a given alpha value is nearly completely transparent.
49 bool IsColorCloseToTransparent(SkAlpha alpha); 49 bool IsColorCloseToTransparent(SkAlpha alpha);
50 50
51 // Determine if a color is near grey. 51 // Determine if a color is near grey.
52 bool IsColorCloseToGrey(int r, int g, int b); 52 bool IsColorCloseToGrey(int r, int g, int b);
53 53
54 // Gets a color representing a bitmap. The definition of "representing" is the
55 // average color in the bitmap. The color returned is modified to have the
56 // specified alpha.
57 SkColor GetAverageColorOfFavicon(SkBitmap* bitmap, SkAlpha alpha);
58
59 // Builds a histogram based on the Y' of the Y'UV representation of 54 // Builds a histogram based on the Y' of the Y'UV representation of
60 // this image. 55 // this image.
61 UI_EXPORT void BuildLumaHistogram(const SkBitmap& bitmap, int histogram[256]); 56 UI_EXPORT void BuildLumaHistogram(const SkBitmap& bitmap, int histogram[256]);
62 57
63 // Returns a blend of the supplied colors, ranging from |background| (for 58 // Returns a blend of the supplied colors, ranging from |background| (for
64 // |alpha| == 0) to |foreground| (for |alpha| == 255). The alpha channels of 59 // |alpha| == 0) to |foreground| (for |alpha| == 255). The alpha channels of
65 // the supplied colors are also taken into account, so the returned color may 60 // the supplied colors are also taken into account, so the returned color may
66 // be partially transparent. 61 // be partially transparent.
67 UI_EXPORT SkColor AlphaBlend(SkColor foreground, SkColor background, 62 UI_EXPORT SkColor AlphaBlend(SkColor foreground, SkColor background,
68 SkAlpha alpha); 63 SkAlpha alpha);
69 64
70 // Given a foreground and background color, try to return a foreground color 65 // Given a foreground and background color, try to return a foreground color
71 // that is "readable" over the background color by luma-inverting the foreground 66 // that is "readable" over the background color by luma-inverting the foreground
72 // color and then picking whichever foreground color has higher contrast against 67 // color and then picking whichever foreground color has higher contrast against
73 // the background color. 68 // the background color.
74 // 69 //
75 // NOTE: This won't do anything but waste time if the supplied foreground color 70 // NOTE: This won't do anything but waste time if the supplied foreground color
76 // has a luma value close to the midpoint (0.5 in the HSL representation). 71 // has a luma value close to the midpoint (0.5 in the HSL representation).
77 UI_EXPORT SkColor GetReadableColor(SkColor foreground, SkColor background); 72 UI_EXPORT SkColor GetReadableColor(SkColor foreground, SkColor background);
78 73
79 // Invert a color. 74 // Invert a color.
80 UI_EXPORT SkColor InvertColor(SkColor color); 75 UI_EXPORT SkColor InvertColor(SkColor color);
81 76
82 // Gets a Windows system color as a SkColor 77 // Gets a Windows system color as a SkColor
83 UI_EXPORT SkColor GetSysSkColor(int which); 78 UI_EXPORT SkColor GetSysSkColor(int which);
84 79
85 } // namespace color_utils 80 } // namespace color_utils
86 81
87 #endif // UI_GFX_COLOR_UTILS_H_ 82 #endif // UI_GFX_COLOR_UTILS_H_
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