42 lines
1.6 KiB
C
42 lines
1.6 KiB
C
/* -*- 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
|