layout/base/nsCSSColorUtils.h
author Gijs Kruitbosch <gijskruitbosch@gmail.com>
Wed, 13 May 2015 22:18:00 +0100
changeset 260491 d5ba1bc97911bc35917c83ce5a92e873af38ec2c
parent 220190 75723dfa8d02a55874a43a43e416662853f88085
child 418830 6a629adbb62a299d7208373d1c6f375149d2afdb
permissions -rw-r--r--
Bug 1164302 - pocket button gets lost after a restart, r=jaws a=dolske

/* -*- 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