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- /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
- /* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
- /* functions that manipulate colors */
- #ifndef __nsCSSColorUtils_h
- #define __nsCSSColorUtils_h
- #include "nsColor.h"
- // "Sufficient contrast" is determined by
- // "Techniques For Accessibility Evalution And Repair Tools".
- // See http://www.w3.org/TR/AERT#color-contrast
- #define NS_SUFFICIENT_LUMINOSITY_DIFFERENCE 125000
- #define NS_LUMINOSITY_DIFFERENCE(a, b) \
- int32_t(mozilla::Abs( \
- NS_GetLuminosity(a | 0xff000000) - NS_GetLuminosity(b | 0xff000000)))
- // To determine colors based on the background brightness and border color
- void NS_GetSpecial3DColors(nscolor aResult[2],
- nscolor aBackgroundColor,
- nscolor aBorderColor);
- // Determins brightness for a specific color
- int NS_GetBrightness(uint8_t aRed, uint8_t aGreen, uint8_t aBlue);
- // Get Luminosity of a specific color. That is same as Y of YIQ color space.
- // The range of return value is 0 to 255000.
- int32_t NS_GetLuminosity(nscolor aColor);
- // function to convert from RGBA color space to HSVA color space
- void NS_RGB2HSV(nscolor aColor, uint16_t &aHue, uint16_t &aSat,
- uint16_t &aValue, uint8_t &aAlpha);
- // function to convert from HSVA color space to RGBA color space
- void NS_HSV2RGB(nscolor &aColor, uint16_t aHue, uint16_t aSat, uint16_t aValue,
- uint8_t aAlpha);
- #endif
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