layout/base/nsCSSColorUtils.h
author Emilio Cobos Álvarez <emilio@crisal.io>
Sat, 22 Sep 2018 07:18:34 +0200
changeset 496787 95dfb8f992a6a376ce53480c15b6a6c78df625b0
parent 442038 905239391e05483e8fb221378dd2092c5a0df8b7
child 508163 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1382896 - Align Gecko and WebRender code for 3d border colors. r=mstange See the discussion in https://github.com/servo/webrender/issues/1280. I think we should do this sooner rather than later. Need to update a couple reftests to hardcode the new colors, waiting on try for that but should be trivial. This makes a few more tests pass which are just marked as failure in bug 1487407, because I implementing the border-collapsing reusing a bunch of Gecko code, including the table 3d border stuff. Differential Revision: https://phabricator.services.mozilla.com/D6565

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 3D colors for groove / ridge borders based on the border color
void NS_GetSpecial3DColors(nscolor aResult[2], 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