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75 lines
3.2 KiB
C
75 lines
3.2 KiB
C
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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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#define NS_LUMINOSITY_DIFFERENCE(a, b) \
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PR_ABS(NS_GetLuminosity(a) - NS_GetLuminosity(b))
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// Weird color computing code stolen from winfe which was stolen
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// from the xfe which was written originally by Eric Bina. So there.
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// To determin colors based on the background brightness
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void NS_Get3DColors(nscolor aResult[2], nscolor aBackgroundColor);
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// To determine colors based on the background brightness and border color
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void NS_GetSpecial3DColors(nscolor aResult[2],
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nscolor aBackgroundColor,
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nscolor aBorderColor);
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// Determins brightness for a specific color
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int NS_GetBrightness(PRUint8 aRed, PRUint8 aGreen, PRUint8 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 255000.
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PRInt32 NS_GetLuminosity(nscolor aColor);
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// function to convert from RGB color space to HSV color space
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void NS_RGB2HSV(nscolor aColor,PRUint16 &aHue,PRUint16 &aSat,PRUint16 &aValue);
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// function to convert from HSV color space to RGB color space
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void NS_HSV2RGB(nscolor &aColor,PRUint16 aHue,PRUint16 aSat,PRUint16 aValue);
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#endif
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