260 lines
6.9 KiB
C++
260 lines
6.9 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 */
|
|
|
|
#include "nsCSSColorUtils.h"
|
|
#include "nsDebug.h"
|
|
#include <math.h>
|
|
|
|
// Weird color computing code stolen from winfe which was stolen
|
|
// from the xfe which was written originally by Eric Bina. So there.
|
|
|
|
#define RED_LUMINOSITY 299
|
|
#define GREEN_LUMINOSITY 587
|
|
#define BLUE_LUMINOSITY 114
|
|
#define INTENSITY_FACTOR 25
|
|
#define LUMINOSITY_FACTOR 75
|
|
|
|
#define MAX_COLOR 255
|
|
#define COLOR_DARK_THRESHOLD 51
|
|
#define COLOR_LIGHT_THRESHOLD 204
|
|
|
|
#define COLOR_LITE_BS_FACTOR 45
|
|
#define COLOR_LITE_TS_FACTOR 70
|
|
|
|
#define COLOR_DARK_BS_FACTOR 30
|
|
#define COLOR_DARK_TS_FACTOR 50
|
|
|
|
#define LIGHT_GRAY NS_RGB(192, 192, 192)
|
|
#define DARK_GRAY NS_RGB(96, 96, 96)
|
|
|
|
#define MAX_BRIGHTNESS 254
|
|
#define MAX_DARKNESS 0
|
|
|
|
void NS_GetSpecial3DColors(nscolor aResult[2],
|
|
nscolor aBackgroundColor,
|
|
nscolor aBorderColor)
|
|
{
|
|
|
|
uint8_t f0, f1;
|
|
uint8_t r, g, b;
|
|
|
|
uint8_t rb = NS_GET_R(aBorderColor);
|
|
uint8_t gb = NS_GET_G(aBorderColor);
|
|
uint8_t bb = NS_GET_B(aBorderColor);
|
|
|
|
uint8_t a = NS_GET_A(aBorderColor);
|
|
|
|
// This needs to be optimized.
|
|
// Calculating background brightness again and again is
|
|
// a waste of time!!!. Just calculate it only once.
|
|
// .....somehow!!!
|
|
|
|
uint8_t red = NS_GET_R(aBackgroundColor);
|
|
uint8_t green = NS_GET_G(aBackgroundColor);
|
|
uint8_t blue = NS_GET_B(aBackgroundColor);
|
|
|
|
uint8_t elementBrightness = NS_GetBrightness(rb,gb,bb);
|
|
uint8_t backgroundBrightness = NS_GetBrightness(red, green, blue);
|
|
|
|
|
|
if (backgroundBrightness < COLOR_DARK_THRESHOLD) {
|
|
f0 = COLOR_DARK_BS_FACTOR;
|
|
f1 = COLOR_DARK_TS_FACTOR;
|
|
if(elementBrightness == MAX_DARKNESS)
|
|
{
|
|
rb = NS_GET_R(DARK_GRAY);
|
|
gb = NS_GET_G(DARK_GRAY);
|
|
bb = NS_GET_B(DARK_GRAY);
|
|
}
|
|
}else if (backgroundBrightness > COLOR_LIGHT_THRESHOLD) {
|
|
f0 = COLOR_LITE_BS_FACTOR;
|
|
f1 = COLOR_LITE_TS_FACTOR;
|
|
if(elementBrightness == MAX_BRIGHTNESS)
|
|
{
|
|
rb = NS_GET_R(LIGHT_GRAY);
|
|
gb = NS_GET_G(LIGHT_GRAY);
|
|
bb = NS_GET_B(LIGHT_GRAY);
|
|
}
|
|
}else {
|
|
f0 = COLOR_DARK_BS_FACTOR +
|
|
(backgroundBrightness *
|
|
(COLOR_LITE_BS_FACTOR - COLOR_DARK_BS_FACTOR) / MAX_COLOR);
|
|
f1 = COLOR_DARK_TS_FACTOR +
|
|
(backgroundBrightness *
|
|
(COLOR_LITE_TS_FACTOR - COLOR_DARK_TS_FACTOR) / MAX_COLOR);
|
|
}
|
|
|
|
|
|
r = rb - (f0 * rb / 100);
|
|
g = gb - (f0 * gb / 100);
|
|
b = bb - (f0 * bb / 100);
|
|
aResult[0] = NS_RGBA(r, g, b, a);
|
|
|
|
r = rb + (f1 * (MAX_COLOR - rb) / 100);
|
|
g = gb + (f1 * (MAX_COLOR - gb) / 100);
|
|
b = bb + (f1 * (MAX_COLOR - bb) / 100);
|
|
aResult[1] = NS_RGBA(r, g, b, a);
|
|
}
|
|
|
|
int NS_GetBrightness(uint8_t aRed, uint8_t aGreen, uint8_t aBlue)
|
|
{
|
|
|
|
uint8_t intensity = (aRed + aGreen + aBlue) / 3;
|
|
|
|
uint8_t luminosity = NS_GetLuminosity(NS_RGB(aRed, aGreen, aBlue)) / 1000;
|
|
|
|
return ((intensity * INTENSITY_FACTOR) +
|
|
(luminosity * LUMINOSITY_FACTOR)) / 100;
|
|
}
|
|
|
|
int32_t NS_GetLuminosity(nscolor aColor)
|
|
{
|
|
// When aColor is not opaque, the perceived luminosity will depend
|
|
// on what color(s) aColor is ultimately drawn on top of, which we
|
|
// do not know.
|
|
NS_ASSERTION(NS_GET_A(aColor) == 255,
|
|
"impossible to compute luminosity of a non-opaque color");
|
|
|
|
return (NS_GET_R(aColor) * RED_LUMINOSITY +
|
|
NS_GET_G(aColor) * GREEN_LUMINOSITY +
|
|
NS_GET_B(aColor) * BLUE_LUMINOSITY);
|
|
}
|
|
|
|
// Function to convert RGB color space into the HSV colorspace
|
|
// Hue is the primary color defined from 0 to 359 degrees
|
|
// Saturation is defined from 0 to 255. The higher the number.. the deeper
|
|
// the color Value is the brightness of the color. 0 is black, 255 is white.
|
|
void NS_RGB2HSV(nscolor aColor, uint16_t &aHue, uint16_t &aSat,
|
|
uint16_t &aValue, uint8_t &aAlpha)
|
|
{
|
|
uint8_t r, g, b;
|
|
int16_t delta, min, max, r1, b1, g1;
|
|
float hue;
|
|
|
|
r = NS_GET_R(aColor);
|
|
g = NS_GET_G(aColor);
|
|
b = NS_GET_B(aColor);
|
|
|
|
if (r>g) {
|
|
max = r;
|
|
min = g;
|
|
} else {
|
|
max = g;
|
|
min = r;
|
|
}
|
|
|
|
if (b>max) {
|
|
max = b;
|
|
}
|
|
if (b<min) {
|
|
min = b;
|
|
}
|
|
|
|
// value or brightness will always be the max of all the colors(RGB)
|
|
aValue = max;
|
|
delta = max-min;
|
|
aSat = (max!=0)?((delta*255)/max):0;
|
|
r1 = r;
|
|
b1 = b;
|
|
g1 = g;
|
|
|
|
if (aSat==0) {
|
|
hue = 1000;
|
|
} else {
|
|
if(r==max){
|
|
hue=(float)(g1-b1)/(float)delta;
|
|
} else if (g1==max) {
|
|
hue= 2.0f+(float)(b1-r1)/(float)delta;
|
|
} else {
|
|
hue = 4.0f+(float)(r1-g1)/(float)delta;
|
|
}
|
|
}
|
|
|
|
if(hue<999) {
|
|
hue*=60;
|
|
if(hue<0){
|
|
hue+=360;
|
|
}
|
|
} else {
|
|
hue=0;
|
|
}
|
|
|
|
aHue = (uint16_t)hue;
|
|
|
|
aAlpha = NS_GET_A(aColor);
|
|
}
|
|
|
|
// Function to convert HSV color space into the RGB colorspace
|
|
// Hue is the primary color defined from 0 to 359 degrees
|
|
// Saturation is defined from 0 to 255. The higher the number.. the deeper
|
|
// the color Value is the brightness of the color. 0 is black, 255 is white.
|
|
void NS_HSV2RGB(nscolor &aColor, uint16_t aHue, uint16_t aSat, uint16_t aValue,
|
|
uint8_t aAlpha)
|
|
{
|
|
uint16_t r = 0, g = 0, b = 0;
|
|
uint16_t i, p, q, t;
|
|
double h, f, percent;
|
|
|
|
if ( aSat == 0 ){
|
|
// achromatic color, no hue is defined
|
|
r = aValue;
|
|
g = aValue;
|
|
b = aValue;
|
|
} else {
|
|
// hue in in degrees around the color wheel defined from
|
|
// 0 to 360 degrees.
|
|
if (aHue >= 360) {
|
|
aHue = 0;
|
|
}
|
|
|
|
// we break the color wheel into 6 areas.. these
|
|
// areas define how the saturation and value define the color.
|
|
// reds behave differently than the blues
|
|
h = (double)aHue / 60.0;
|
|
i = (uint16_t) floor(h);
|
|
f = h-(double)i;
|
|
percent = ((double)aValue/255.0); // this needs to be a value from 0 to 1, so a percentage
|
|
// can be calculated of the saturation.
|
|
p = (uint16_t)(percent*(255-aSat));
|
|
q = (uint16_t)(percent*(255-(aSat*f)));
|
|
t = (uint16_t)(percent*(255-(aSat*(1.0-f))));
|
|
|
|
// i is guaranteed to never be larger than 5.
|
|
switch(i){
|
|
case 0: r = aValue; g = t; b = p;break;
|
|
case 1: r = q; g = aValue; b = p;break;
|
|
case 2: r = p; g = aValue; b = t;break;
|
|
case 3: r = p; g = q; b = aValue;break;
|
|
case 4: r = t; g = p; b = aValue;break;
|
|
case 5: r = aValue; g = p; b = q;break;
|
|
}
|
|
}
|
|
aColor = NS_RGBA(r, g, b, aAlpha);
|
|
}
|
|
|
|
#undef RED_LUMINOSITY
|
|
#undef GREEN_LUMINOSITY
|
|
#undef BLUE_LUMINOSITY
|
|
#undef INTENSITY_FACTOR
|
|
#undef LUMINOSITY_FACTOR
|
|
|
|
#undef MAX_COLOR
|
|
#undef COLOR_DARK_THRESHOLD
|
|
#undef COLOR_LIGHT_THRESHOLD
|
|
|
|
#undef COLOR_LITE_BS_FACTOR
|
|
#undef COLOR_LITE_TS_FACTOR
|
|
|
|
#undef COLOR_DARK_BS_FACTOR
|
|
#undef COLOR_DARK_TS_FACTOR
|
|
|
|
#undef LIGHT_GRAY
|
|
#undef DARK_GRAY
|
|
|
|
#undef MAX_BRIGHTNESS
|
|
#undef MAX_DARKNESS
|