1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/base/nsCSSColorUtils.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,259 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +/* functions that manipulate colors */
1.10 +
1.11 +#include "nsCSSColorUtils.h"
1.12 +#include "nsDebug.h"
1.13 +#include <math.h>
1.14 +
1.15 +// Weird color computing code stolen from winfe which was stolen
1.16 +// from the xfe which was written originally by Eric Bina. So there.
1.17 +
1.18 +#define RED_LUMINOSITY 299
1.19 +#define GREEN_LUMINOSITY 587
1.20 +#define BLUE_LUMINOSITY 114
1.21 +#define INTENSITY_FACTOR 25
1.22 +#define LUMINOSITY_FACTOR 75
1.23 +
1.24 +#define MAX_COLOR 255
1.25 +#define COLOR_DARK_THRESHOLD 51
1.26 +#define COLOR_LIGHT_THRESHOLD 204
1.27 +
1.28 +#define COLOR_LITE_BS_FACTOR 45
1.29 +#define COLOR_LITE_TS_FACTOR 70
1.30 +
1.31 +#define COLOR_DARK_BS_FACTOR 30
1.32 +#define COLOR_DARK_TS_FACTOR 50
1.33 +
1.34 +#define LIGHT_GRAY NS_RGB(192, 192, 192)
1.35 +#define DARK_GRAY NS_RGB(96, 96, 96)
1.36 +
1.37 +#define MAX_BRIGHTNESS 254
1.38 +#define MAX_DARKNESS 0
1.39 +
1.40 +void NS_GetSpecial3DColors(nscolor aResult[2],
1.41 + nscolor aBackgroundColor,
1.42 + nscolor aBorderColor)
1.43 +{
1.44 +
1.45 + uint8_t f0, f1;
1.46 + uint8_t r, g, b;
1.47 +
1.48 + uint8_t rb = NS_GET_R(aBorderColor);
1.49 + uint8_t gb = NS_GET_G(aBorderColor);
1.50 + uint8_t bb = NS_GET_B(aBorderColor);
1.51 +
1.52 + uint8_t a = NS_GET_A(aBorderColor);
1.53 +
1.54 + // This needs to be optimized.
1.55 + // Calculating background brightness again and again is
1.56 + // a waste of time!!!. Just calculate it only once.
1.57 + // .....somehow!!!
1.58 +
1.59 + uint8_t red = NS_GET_R(aBackgroundColor);
1.60 + uint8_t green = NS_GET_G(aBackgroundColor);
1.61 + uint8_t blue = NS_GET_B(aBackgroundColor);
1.62 +
1.63 + uint8_t elementBrightness = NS_GetBrightness(rb,gb,bb);
1.64 + uint8_t backgroundBrightness = NS_GetBrightness(red, green, blue);
1.65 +
1.66 +
1.67 + if (backgroundBrightness < COLOR_DARK_THRESHOLD) {
1.68 + f0 = COLOR_DARK_BS_FACTOR;
1.69 + f1 = COLOR_DARK_TS_FACTOR;
1.70 + if(elementBrightness == MAX_DARKNESS)
1.71 + {
1.72 + rb = NS_GET_R(DARK_GRAY);
1.73 + gb = NS_GET_G(DARK_GRAY);
1.74 + bb = NS_GET_B(DARK_GRAY);
1.75 + }
1.76 + }else if (backgroundBrightness > COLOR_LIGHT_THRESHOLD) {
1.77 + f0 = COLOR_LITE_BS_FACTOR;
1.78 + f1 = COLOR_LITE_TS_FACTOR;
1.79 + if(elementBrightness == MAX_BRIGHTNESS)
1.80 + {
1.81 + rb = NS_GET_R(LIGHT_GRAY);
1.82 + gb = NS_GET_G(LIGHT_GRAY);
1.83 + bb = NS_GET_B(LIGHT_GRAY);
1.84 + }
1.85 + }else {
1.86 + f0 = COLOR_DARK_BS_FACTOR +
1.87 + (backgroundBrightness *
1.88 + (COLOR_LITE_BS_FACTOR - COLOR_DARK_BS_FACTOR) / MAX_COLOR);
1.89 + f1 = COLOR_DARK_TS_FACTOR +
1.90 + (backgroundBrightness *
1.91 + (COLOR_LITE_TS_FACTOR - COLOR_DARK_TS_FACTOR) / MAX_COLOR);
1.92 + }
1.93 +
1.94 +
1.95 + r = rb - (f0 * rb / 100);
1.96 + g = gb - (f0 * gb / 100);
1.97 + b = bb - (f0 * bb / 100);
1.98 + aResult[0] = NS_RGBA(r, g, b, a);
1.99 +
1.100 + r = rb + (f1 * (MAX_COLOR - rb) / 100);
1.101 + g = gb + (f1 * (MAX_COLOR - gb) / 100);
1.102 + b = bb + (f1 * (MAX_COLOR - bb) / 100);
1.103 + aResult[1] = NS_RGBA(r, g, b, a);
1.104 +}
1.105 +
1.106 +int NS_GetBrightness(uint8_t aRed, uint8_t aGreen, uint8_t aBlue)
1.107 +{
1.108 +
1.109 + uint8_t intensity = (aRed + aGreen + aBlue) / 3;
1.110 +
1.111 + uint8_t luminosity = NS_GetLuminosity(NS_RGB(aRed, aGreen, aBlue)) / 1000;
1.112 +
1.113 + return ((intensity * INTENSITY_FACTOR) +
1.114 + (luminosity * LUMINOSITY_FACTOR)) / 100;
1.115 +}
1.116 +
1.117 +int32_t NS_GetLuminosity(nscolor aColor)
1.118 +{
1.119 + // When aColor is not opaque, the perceived luminosity will depend
1.120 + // on what color(s) aColor is ultimately drawn on top of, which we
1.121 + // do not know.
1.122 + NS_ASSERTION(NS_GET_A(aColor) == 255,
1.123 + "impossible to compute luminosity of a non-opaque color");
1.124 +
1.125 + return (NS_GET_R(aColor) * RED_LUMINOSITY +
1.126 + NS_GET_G(aColor) * GREEN_LUMINOSITY +
1.127 + NS_GET_B(aColor) * BLUE_LUMINOSITY);
1.128 +}
1.129 +
1.130 +// Function to convert RGB color space into the HSV colorspace
1.131 +// Hue is the primary color defined from 0 to 359 degrees
1.132 +// Saturation is defined from 0 to 255. The higher the number.. the deeper
1.133 +// the color Value is the brightness of the color. 0 is black, 255 is white.
1.134 +void NS_RGB2HSV(nscolor aColor, uint16_t &aHue, uint16_t &aSat,
1.135 + uint16_t &aValue, uint8_t &aAlpha)
1.136 +{
1.137 + uint8_t r, g, b;
1.138 + int16_t delta, min, max, r1, b1, g1;
1.139 + float hue;
1.140 +
1.141 + r = NS_GET_R(aColor);
1.142 + g = NS_GET_G(aColor);
1.143 + b = NS_GET_B(aColor);
1.144 +
1.145 + if (r>g) {
1.146 + max = r;
1.147 + min = g;
1.148 + } else {
1.149 + max = g;
1.150 + min = r;
1.151 + }
1.152 +
1.153 + if (b>max) {
1.154 + max = b;
1.155 + }
1.156 + if (b<min) {
1.157 + min = b;
1.158 + }
1.159 +
1.160 + // value or brightness will always be the max of all the colors(RGB)
1.161 + aValue = max;
1.162 + delta = max-min;
1.163 + aSat = (max!=0)?((delta*255)/max):0;
1.164 + r1 = r;
1.165 + b1 = b;
1.166 + g1 = g;
1.167 +
1.168 + if (aSat==0) {
1.169 + hue = 1000;
1.170 + } else {
1.171 + if(r==max){
1.172 + hue=(float)(g1-b1)/(float)delta;
1.173 + } else if (g1==max) {
1.174 + hue= 2.0f+(float)(b1-r1)/(float)delta;
1.175 + } else {
1.176 + hue = 4.0f+(float)(r1-g1)/(float)delta;
1.177 + }
1.178 + }
1.179 +
1.180 + if(hue<999) {
1.181 + hue*=60;
1.182 + if(hue<0){
1.183 + hue+=360;
1.184 + }
1.185 + } else {
1.186 + hue=0;
1.187 + }
1.188 +
1.189 + aHue = (uint16_t)hue;
1.190 +
1.191 + aAlpha = NS_GET_A(aColor);
1.192 +}
1.193 +
1.194 +// Function to convert HSV color space into the RGB colorspace
1.195 +// Hue is the primary color defined from 0 to 359 degrees
1.196 +// Saturation is defined from 0 to 255. The higher the number.. the deeper
1.197 +// the color Value is the brightness of the color. 0 is black, 255 is white.
1.198 +void NS_HSV2RGB(nscolor &aColor, uint16_t aHue, uint16_t aSat, uint16_t aValue,
1.199 + uint8_t aAlpha)
1.200 +{
1.201 + uint16_t r = 0, g = 0, b = 0;
1.202 + uint16_t i, p, q, t;
1.203 + double h, f, percent;
1.204 +
1.205 + if ( aSat == 0 ){
1.206 + // achromatic color, no hue is defined
1.207 + r = aValue;
1.208 + g = aValue;
1.209 + b = aValue;
1.210 + } else {
1.211 + // hue in in degrees around the color wheel defined from
1.212 + // 0 to 360 degrees.
1.213 + if (aHue >= 360) {
1.214 + aHue = 0;
1.215 + }
1.216 +
1.217 + // we break the color wheel into 6 areas.. these
1.218 + // areas define how the saturation and value define the color.
1.219 + // reds behave differently than the blues
1.220 + h = (double)aHue / 60.0;
1.221 + i = (uint16_t) floor(h);
1.222 + f = h-(double)i;
1.223 + percent = ((double)aValue/255.0); // this needs to be a value from 0 to 1, so a percentage
1.224 + // can be calculated of the saturation.
1.225 + p = (uint16_t)(percent*(255-aSat));
1.226 + q = (uint16_t)(percent*(255-(aSat*f)));
1.227 + t = (uint16_t)(percent*(255-(aSat*(1.0-f))));
1.228 +
1.229 + // i is guaranteed to never be larger than 5.
1.230 + switch(i){
1.231 + case 0: r = aValue; g = t; b = p;break;
1.232 + case 1: r = q; g = aValue; b = p;break;
1.233 + case 2: r = p; g = aValue; b = t;break;
1.234 + case 3: r = p; g = q; b = aValue;break;
1.235 + case 4: r = t; g = p; b = aValue;break;
1.236 + case 5: r = aValue; g = p; b = q;break;
1.237 + }
1.238 + }
1.239 + aColor = NS_RGBA(r, g, b, aAlpha);
1.240 +}
1.241 +
1.242 +#undef RED_LUMINOSITY
1.243 +#undef GREEN_LUMINOSITY
1.244 +#undef BLUE_LUMINOSITY
1.245 +#undef INTENSITY_FACTOR
1.246 +#undef LUMINOSITY_FACTOR
1.247 +
1.248 +#undef MAX_COLOR
1.249 +#undef COLOR_DARK_THRESHOLD
1.250 +#undef COLOR_LIGHT_THRESHOLD
1.251 +
1.252 +#undef COLOR_LITE_BS_FACTOR
1.253 +#undef COLOR_LITE_TS_FACTOR
1.254 +
1.255 +#undef COLOR_DARK_BS_FACTOR
1.256 +#undef COLOR_DARK_TS_FACTOR
1.257 +
1.258 +#undef LIGHT_GRAY
1.259 +#undef DARK_GRAY
1.260 +
1.261 +#undef MAX_BRIGHTNESS
1.262 +#undef MAX_DARKNESS
