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43 lines
1.6 KiB
C
43 lines
1.6 KiB
C
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* functions that manipulate colors */
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#ifndef __nsCSSColorUtils_h
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#define __nsCSSColorUtils_h
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#include "mozilla/MathAlgorithms.h"
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#include "nsColor.h"
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// "Sufficient contrast" is determined by
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// "Techniques For Accessibility Evalution And Repair Tools".
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// See http://www.w3.org/TR/AERT#color-contrast
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#define NS_SUFFICIENT_LUMINOSITY_DIFFERENCE 125000
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#define NS_LUMINOSITY_DIFFERENCE(a, b) \
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mozilla::Abs(NS_GetLuminosity(a) - NS_GetLuminosity(b))
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// To determine colors based on the background brightness and border color
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void NS_GetSpecial3DColors(nscolor aResult[2],
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nscolor aBackgroundColor,
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nscolor aBorderColor);
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// Determins brightness for a specific color
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int NS_GetBrightness(uint8_t aRed, uint8_t aGreen, uint8_t aBlue);
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// Get Luminosity of a specific color. That is same as Y of YIQ color space.
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// The range of return value is 0 to 255000.
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int32_t NS_GetLuminosity(nscolor aColor);
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// function to convert from RGBA color space to HSVA color space
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void NS_RGB2HSV(nscolor aColor, uint16_t &aHue, uint16_t &aSat,
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uint16_t &aValue, uint8_t &aAlpha);
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// function to convert from HSVA color space to RGBA color space
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void NS_HSV2RGB(nscolor &aColor, uint16_t aHue, uint16_t aSat, uint16_t aValue,
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uint8_t aAlpha);
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#endif
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