1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/base/nsCSSColorUtils.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,40 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +/* functions that manipulate colors */
1.10 +
1.11 +#ifndef __nsCSSColorUtils_h
1.12 +#define __nsCSSColorUtils_h
1.13 +
1.14 +#include "nsColor.h"
1.15 +
1.16 +// "Sufficient contrast" is determined by
1.17 +// "Techniques For Accessibility Evalution And Repair Tools".
1.18 +// See http://www.w3.org/TR/AERT#color-contrast
1.19 +#define NS_SUFFICIENT_LUMINOSITY_DIFFERENCE 125000
1.20 +#define NS_LUMINOSITY_DIFFERENCE(a, b) \
1.21 + int32_t(mozilla::Abs(NS_GetLuminosity(a) - NS_GetLuminosity(b)))
1.22 +
1.23 +// To determine colors based on the background brightness and border color
1.24 +void NS_GetSpecial3DColors(nscolor aResult[2],
1.25 + nscolor aBackgroundColor,
1.26 + nscolor aBorderColor);
1.27 +
1.28 +// Determins brightness for a specific color
1.29 +int NS_GetBrightness(uint8_t aRed, uint8_t aGreen, uint8_t aBlue);
1.30 +
1.31 +// Get Luminosity of a specific color. That is same as Y of YIQ color space.
1.32 +// The range of return value is 0 to 255000.
1.33 +int32_t NS_GetLuminosity(nscolor aColor);
1.34 +
1.35 +// function to convert from RGBA color space to HSVA color space
1.36 +void NS_RGB2HSV(nscolor aColor, uint16_t &aHue, uint16_t &aSat,
1.37 + uint16_t &aValue, uint8_t &aAlpha);
1.38 +
1.39 +// function to convert from HSVA color space to RGBA color space
1.40 +void NS_HSV2RGB(nscolor &aColor, uint16_t aHue, uint16_t aSat, uint16_t aValue,
1.41 + uint8_t aAlpha);
1.42 +
1.43 +#endif
