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// Copyright (c) 2009 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 APP_GFX_COLOR_UTILS_H_
#define APP_GFX_COLOR_UTILS_H_
#include "third_party/skia/include/core/SkColor.h"
class SkBitmap;
namespace color_utils {
// Determine if a given alpha value is nearly completely transparent.
bool IsColorCloseToTransparent(SkAlpha alpha);
// Determine if a color is near grey.
bool IsColorCloseToGrey(int r, int g, int b);
// Gets a color representing a bitmap. The definition of "representing" is the
// average color in the bitmap. The color returned is modified to have the
// specified alpha.
SkColor GetAverageColorOfFavicon(SkBitmap* bitmap, SkAlpha alpha);
// Builds a histogram based on the Y' of the Y'UV representation of
// this image.
void BuildLumaHistogram(SkBitmap* bitmap, int histogram[256]);
// Returns a blend of the supplied colors, ranging from |background| (for
// |alpha| == 0) to |foreground| (for |alpha| == 255).
SkColor AlphaBlend(SkColor foreground, SkColor background, SkAlpha alpha);
// Given two possible foreground colors, return the one that is more readable
// over |background|.
SkColor PickMoreReadableColor(SkColor foreground1,
SkColor foreground2,
SkColor background);
// Gets a Windows system color as a SkColor
SkColor GetSysSkColor(int which);
} // namespace color_utils
#endif // APP_GFX_COLOR_UTILS_H_
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