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50 lines
1.9 KiB
C
50 lines
1.9 KiB
C
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "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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// NS_SUFFICIENT_LUMINOSITY_DIFFERENCE is the a11y standard for text
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// on a background. Use 20% of that standard since we have a background
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// on top of another background
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#define NS_SUFFICIENT_LUMINOSITY_DIFFERENCE_BG \
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(NS_SUFFICIENT_LUMINOSITY_DIFFERENCE / 5)
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#define NS_LUMINOSITY_DIFFERENCE(a, b) \
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int32_t(mozilla::Abs(NS_GetLuminosity(a | 0xff000000) - \
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NS_GetLuminosity(b | 0xff000000)))
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// Maximum value that NS_GetLuminosity can return.
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#define NS_MAX_LUMINOSITY 255000
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// To determine 3D colors for groove / ridge borders based on the border color
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void NS_GetSpecial3DColors(nscolor aResult[2], 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 NS_MAX_LUMINOSITY.
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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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