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WLED/wled00/colors.cpp

547 wiersze
18 KiB
C++
Czysty Wina Historia

#include "wled.h"
/*
* Color conversion & utility methods
*/
/*
* color blend function, based on FastLED blend function
* the calculation for each color is: result = (A*(amountOfA) + A + B*(amountOfB) + B) / 256 with amountOfA = 255 - amountOfB
*/
uint32_t color_blend(uint32_t color1, uint32_t color2, uint8_t blend) {
// min / max blend checking is omitted: calls with 0 or 255 are rare, checking lowers overall performance
uint32_t rb1 = color1 & 0x00FF00FF;
uint32_t wg1 = (color1>>8) & 0x00FF00FF;
uint32_t rb2 = color2 & 0x00FF00FF;
uint32_t wg2 = (color2>>8) & 0x00FF00FF;
uint32_t rb3 = ((((rb1 << 8) | rb2) + (rb2 * blend) - (rb1 * blend)) >> 8) & 0x00FF00FF;
uint32_t wg3 = ((((wg1 << 8) | wg2) + (wg2 * blend) - (wg1 * blend))) & 0xFF00FF00;
return rb3 | wg3;
}
/*
* color add function that preserves ratio
* original idea: https://github.com/Aircoookie/WLED/pull/2465 by https://github.com/Proto-molecule
* speed optimisations by @dedehai
*/
uint32_t color_add(uint32_t c1, uint32_t c2, bool preserveCR)
{
if (c1 == BLACK) return c2;
if (c2 == BLACK) return c1;
uint32_t rb = (c1 & 0x00FF00FF) + (c2 & 0x00FF00FF); // mask and add two colors at once
uint32_t wg = ((c1>>8) & 0x00FF00FF) + ((c2>>8) & 0x00FF00FF);
uint32_t r = rb >> 16; // extract single color values
uint32_t b = rb & 0xFFFF;
uint32_t w = wg >> 16;
uint32_t g = wg & 0xFFFF;
if (preserveCR) { // preserve color ratios
uint32_t max = std::max(r,g); // check for overflow note
max = std::max(max,b);
max = std::max(max,w);
//unsigned max = r; // check for overflow note
//max = g > max ? g : max;
//max = b > max ? b : max;
//max = w > max ? w : max;
if (max > 255) {
uint32_t scale = (uint32_t(255)<<8) / max; // division of two 8bit (shifted) values does not work -> use bit shifts and multiplaction instead
rb = ((rb * scale) >> 8) & 0x00FF00FF; //
wg = (wg * scale) & 0xFF00FF00;
} else wg = wg << 8; //shift white and green back to correct position
return rb | wg;
} else {
r = r > 255 ? 255 : r;
g = g > 255 ? 255 : g;
b = b > 255 ? 255 : b;
w = w > 255 ? 255 : w;
return RGBW32(r,g,b,w);
}
}
/*
* fades color toward black
* if using "video" method the resulting color will never become black unless it is already black
*/
uint32_t color_fade(uint32_t c1, uint8_t amount, bool video)
{
if (amount == 255) return c1;
if (c1 == BLACK || amount == 0) return BLACK;
uint32_t scaledcolor; // color order is: W R G B from MSB to LSB
uint32_t scale = amount; // 32bit for faster calculation
uint32_t addRemains = 0;
if (!video) scale++; // add one for correct scaling using bitshifts
else { // video scaling: make sure colors do not dim to zero if they started non-zero
addRemains = R(c1) ? 0x00010000 : 0;
addRemains |= G(c1) ? 0x00000100 : 0;
addRemains |= B(c1) ? 0x00000001 : 0;
addRemains |= W(c1) ? 0x01000000 : 0;
}
uint32_t rb = (((c1 & 0x00FF00FF) * scale) >> 8) & 0x00FF00FF; // scale red and blue
uint32_t wg = (((c1 & 0xFF00FF00) >> 8) * scale) & 0xFF00FF00; // scale white and green
scaledcolor = (rb | wg) + addRemains;
return scaledcolor;
}
// 1:1 replacement of fastled function optimized for ESP, slightly faster, more accurate and uses less flash (~ -200bytes)
uint32_t ColorFromPaletteWLED(const CRGBPalette16& pal, unsigned index, uint8_t brightness, TBlendType blendType)
{
if (blendType == LINEARBLEND_NOWRAP) {
index = (index * 0xF0) >> 8; // Blend range is affected by lo4 blend of values, remap to avoid wrapping
}
uint32_t clr32;
unsigned hi4 = byte(index) >> 4;
unsigned lo4 = (index & 0x0F);
const CRGB* entry = (CRGB*)&(pal[0]) + hi4;
if(lo4 && blendType != NOBLEND) {
unsigned red1 = entry->r;
unsigned green1 = entry->g;
unsigned blue1 = entry->b;
if (hi4 == 15) entry = &(pal[0]);
else ++entry;
unsigned f2 = (lo4 << 4);
unsigned f1 = 256 - f2;
red1 = (red1 * f1 + (unsigned)entry->r * f2) >> 8; // note: using color_blend() is 20% slower
green1 = (green1 * f1 + (unsigned)entry->g * f2) >> 8;
blue1 = (blue1 * f1 + (unsigned)entry->b * f2) >> 8;
clr32 = RGBW32(red1, green1, blue1, 0);
}
else
clr32 = RGBW32(entry->r, entry->g, entry->b, 0);
if (brightness < 255) { // note: zero checking could be done to return black but that is hardly ever used so it is omitted
clr32 = color_fade(clr32, brightness);
}
return clr32;
}
void setRandomColor(byte* rgb)
{
lastRandomIndex = get_random_wheel_index(lastRandomIndex);
colorHStoRGB(lastRandomIndex*256,255,rgb);
}
/*
* generates a random palette based on harmonic color theory
* takes a base palette as the input, it will choose one color of the base palette and keep it
*/
CRGBPalette16 generateHarmonicRandomPalette(const CRGBPalette16 &basepalette)
{
CHSV palettecolors[4]; // array of colors for the new palette
uint8_t keepcolorposition = hw_random8(4); // color position of current random palette to keep
palettecolors[keepcolorposition] = rgb2hsv(basepalette.entries[keepcolorposition*5]); // read one of the base colors of the current palette
palettecolors[keepcolorposition].hue += hw_random8(10)-5; // +/- 5 randomness of base color
// generate 4 saturation and brightness value numbers
// only one saturation is allowed to be below 200 creating mostly vibrant colors
// only one brightness value number is allowed below 200, creating mostly bright palettes
for (int i = 0; i < 3; i++) { // generate three high values
palettecolors[i].saturation = hw_random8(200,255);
palettecolors[i].value = hw_random8(220,255);
}
// allow one to be lower
palettecolors[3].saturation = hw_random8(20,255);
palettecolors[3].value = hw_random8(80,255);
// shuffle the arrays
for (int i = 3; i > 0; i--) {
std::swap(palettecolors[i].saturation, palettecolors[hw_random8(i + 1)].saturation);
std::swap(palettecolors[i].value, palettecolors[hw_random8(i + 1)].value);
}
// now generate three new hues based off of the hue of the chosen current color
uint8_t basehue = palettecolors[keepcolorposition].hue;
uint8_t harmonics[3]; // hues that are harmonic but still a little random
uint8_t type = hw_random8(5); // choose a harmony type
switch (type) {
case 0: // analogous
harmonics[0] = basehue + hw_random8(30, 50);
harmonics[1] = basehue + hw_random8(10, 30);
harmonics[2] = basehue - hw_random8(10, 30);
break;
case 1: // triadic
harmonics[0] = basehue + 113 + hw_random8(15);
harmonics[1] = basehue + 233 + hw_random8(15);
harmonics[2] = basehue - 7 + hw_random8(15);
break;
case 2: // split-complementary
harmonics[0] = basehue + 145 + hw_random8(10);
harmonics[1] = basehue + 205 + hw_random8(10);
harmonics[2] = basehue - 5 + hw_random8(10);
break;
case 3: // square
harmonics[0] = basehue + 85 + hw_random8(10);
harmonics[1] = basehue + 175 + hw_random8(10);
harmonics[2] = basehue + 265 + hw_random8(10);
break;
case 4: // tetradic
harmonics[0] = basehue + 80 + hw_random8(20);
harmonics[1] = basehue + 170 + hw_random8(20);
harmonics[2] = basehue - 15 + hw_random8(30);
break;
}
if (hw_random8() < 128) {
// 50:50 chance of shuffling hues or keep the color order
for (int i = 2; i > 0; i--) {
std::swap(harmonics[i], harmonics[hw_random8(i + 1)]);
}
}
// now set the hues
int j = 0;
for (int i = 0; i < 4; i++) {
if (i==keepcolorposition) continue; // skip the base color
palettecolors[i].hue = harmonics[j];
j++;
}
bool makepastelpalette = false;
if (hw_random8() < 25) { // ~10% chance of desaturated 'pastel' colors
makepastelpalette = true;
}
// apply saturation & gamma correction
CRGB RGBpalettecolors[4];
for (int i = 0; i < 4; i++) {
if (makepastelpalette && palettecolors[i].saturation > 180) {
palettecolors[i].saturation -= 160; //desaturate all four colors
}
RGBpalettecolors[i] = (CRGB)palettecolors[i]; //convert to RGB
RGBpalettecolors[i] = gamma32(((uint32_t)RGBpalettecolors[i]) & 0x00FFFFFFU); //strip alpha from CRGB
}
return CRGBPalette16(RGBpalettecolors[0],
RGBpalettecolors[1],
RGBpalettecolors[2],
RGBpalettecolors[3]);
}
CRGBPalette16 generateRandomPalette() // generate fully random palette
{
return CRGBPalette16(CHSV(hw_random8(), hw_random8(160, 255), hw_random8(128, 255)),
CHSV(hw_random8(), hw_random8(160, 255), hw_random8(128, 255)),
CHSV(hw_random8(), hw_random8(160, 255), hw_random8(128, 255)),
CHSV(hw_random8(), hw_random8(160, 255), hw_random8(128, 255)));
}
void hsv2rgb(const CHSV32& hsv, uint32_t& rgb) // convert HSV (16bit hue) to RGB (32bit with white = 0)
{
unsigned int remainder, region, p, q, t;
unsigned int h = hsv.h;
unsigned int s = hsv.s;
unsigned int v = hsv.v;
if (s == 0) {
rgb = v << 16 | v << 8 | v;
return;
}
region = h / 10923; // 65536 / 6 = 10923
remainder = (h - (region * 10923)) * 6;
p = (v * (255 - s)) >> 8;
q = (v * (255 - ((s * remainder) >> 16))) >> 8;
t = (v * (255 - ((s * (65535 - remainder)) >> 16))) >> 8;
switch (region) {
case 0:
rgb = v << 16 | t << 8 | p; break;
case 1:
rgb = q << 16 | v << 8 | p; break;
case 2:
rgb = p << 16 | v << 8 | t; break;
case 3:
rgb = p << 16 | q << 8 | v; break;
case 4:
rgb = t << 16 | p << 8 | v; break;
default:
rgb = v << 16 | p << 8 | q; break;
}
}
void rgb2hsv(const uint32_t rgb, CHSV32& hsv) // convert RGB to HSV (16bit hue), much more accurate and faster than fastled version
{
hsv.raw = 0;
int32_t r = (rgb>>16)&0xFF;
int32_t g = (rgb>>8)&0xFF;
int32_t b = rgb&0xFF;
int32_t minval, maxval, delta;
minval = min(r, g);
minval = min(minval, b);
maxval = max(r, g);
maxval = max(maxval, b);
if (maxval == 0) return; // black
hsv.v = maxval;
delta = maxval - minval;
hsv.s = (255 * delta) / maxval;
if (hsv.s == 0) return; // gray value
if (maxval == r) hsv.h = (10923 * (g - b)) / delta;
else if (maxval == g) hsv.h = 21845 + (10923 * (b - r)) / delta;
else hsv.h = 43690 + (10923 * (r - g)) / delta;
}
void colorHStoRGB(uint16_t hue, byte sat, byte* rgb) { //hue, sat to rgb
uint32_t crgb;
hsv2rgb(CHSV32(hue, sat, 255), crgb);
rgb[0] = byte((crgb) >> 16);
rgb[1] = byte((crgb) >> 8);
rgb[2] = byte(crgb);
}
//get RGB values from color temperature in K (https://tannerhelland.com/2012/09/18/convert-temperature-rgb-algorithm-code.html)
void colorKtoRGB(uint16_t kelvin, byte* rgb) //white spectrum to rgb, calc
{
int r = 0, g = 0, b = 0;
float temp = kelvin / 100.0f;
if (temp <= 66.0f) {
r = 255;
g = roundf(99.4708025861f * logf(temp) - 161.1195681661f);
if (temp <= 19.0f) {
b = 0;
} else {
b = roundf(138.5177312231f * logf((temp - 10.0f)) - 305.0447927307f);
}
} else {
r = roundf(329.698727446f * powf((temp - 60.0f), -0.1332047592f));
g = roundf(288.1221695283f * powf((temp - 60.0f), -0.0755148492f));
b = 255;
}
//g += 12; //mod by Aircoookie, a bit less accurate but visibly less pinkish
rgb[0] = (uint8_t) constrain(r, 0, 255);
rgb[1] = (uint8_t) constrain(g, 0, 255);
rgb[2] = (uint8_t) constrain(b, 0, 255);
rgb[3] = 0;
}
void colorCTtoRGB(uint16_t mired, byte* rgb) //white spectrum to rgb, bins
{
//this is only an approximation using WS2812B with gamma correction enabled
if (mired > 475) {
rgb[0]=255;rgb[1]=199;rgb[2]=92;//500
} else if (mired > 425) {
rgb[0]=255;rgb[1]=213;rgb[2]=118;//450
} else if (mired > 375) {
rgb[0]=255;rgb[1]=216;rgb[2]=118;//400
} else if (mired > 325) {
rgb[0]=255;rgb[1]=234;rgb[2]=140;//350
} else if (mired > 275) {
rgb[0]=255;rgb[1]=243;rgb[2]=160;//300
} else if (mired > 225) {
rgb[0]=250;rgb[1]=255;rgb[2]=188;//250
} else if (mired > 175) {
rgb[0]=247;rgb[1]=255;rgb[2]=215;//200
} else {
rgb[0]=237;rgb[1]=255;rgb[2]=239;//150
}
}
#ifndef WLED_DISABLE_HUESYNC
void colorXYtoRGB(float x, float y, byte* rgb) //coordinates to rgb (https://www.developers.meethue.com/documentation/color-conversions-rgb-xy)
{
float z = 1.0f - x - y;
float X = (1.0f / y) * x;
float Z = (1.0f / y) * z;
float r = (int)255*(X * 1.656492f - 0.354851f - Z * 0.255038f);
float g = (int)255*(-X * 0.707196f + 1.655397f + Z * 0.036152f);
float b = (int)255*(X * 0.051713f - 0.121364f + Z * 1.011530f);
if (r > b && r > g && r > 1.0f) {
// red is too big
g = g / r;
b = b / r;
r = 1.0f;
} else if (g > b && g > r && g > 1.0f) {
// green is too big
r = r / g;
b = b / g;
g = 1.0f;
} else if (b > r && b > g && b > 1.0f) {
// blue is too big
r = r / b;
g = g / b;
b = 1.0f;
}
// Apply gamma correction
r = r <= 0.0031308f ? 12.92f * r : (1.0f + 0.055f) * powf(r, (1.0f / 2.4f)) - 0.055f;
g = g <= 0.0031308f ? 12.92f * g : (1.0f + 0.055f) * powf(g, (1.0f / 2.4f)) - 0.055f;
b = b <= 0.0031308f ? 12.92f * b : (1.0f + 0.055f) * powf(b, (1.0f / 2.4f)) - 0.055f;
if (r > b && r > g) {
// red is biggest
if (r > 1.0f) {
g = g / r;
b = b / r;
r = 1.0f;
}
} else if (g > b && g > r) {
// green is biggest
if (g > 1.0f) {
r = r / g;
b = b / g;
g = 1.0f;
}
} else if (b > r && b > g) {
// blue is biggest
if (b > 1.0f) {
r = r / b;
g = g / b;
b = 1.0f;
}
}
rgb[0] = byte(255.0f*r);
rgb[1] = byte(255.0f*g);
rgb[2] = byte(255.0f*b);
}
void colorRGBtoXY(const byte* rgb, float* xy) //rgb to coordinates (https://www.developers.meethue.com/documentation/color-conversions-rgb-xy)
{
float X = rgb[0] * 0.664511f + rgb[1] * 0.154324f + rgb[2] * 0.162028f;
float Y = rgb[0] * 0.283881f + rgb[1] * 0.668433f + rgb[2] * 0.047685f;
float Z = rgb[0] * 0.000088f + rgb[1] * 0.072310f + rgb[2] * 0.986039f;
xy[0] = X / (X + Y + Z);
xy[1] = Y / (X + Y + Z);
}
#endif // WLED_DISABLE_HUESYNC
//RRGGBB / WWRRGGBB order for hex
void colorFromDecOrHexString(byte* rgb, const char* in)
{
if (in[0] == 0) return;
char first = in[0];
uint32_t c = 0;
if (first == '#' || first == 'h' || first == 'H') //is HEX encoded
{
c = strtoul(in +1, NULL, 16);
} else
{
c = strtoul(in, NULL, 10);
}
rgb[0] = R(c);
rgb[1] = G(c);
rgb[2] = B(c);
rgb[3] = W(c);
}
//contrary to the colorFromDecOrHexString() function, this uses the more standard RRGGBB / RRGGBBWW order
bool colorFromHexString(byte* rgb, const char* in) {
if (in == nullptr) return false;
size_t inputSize = strnlen(in, 9);
if (inputSize != 6 && inputSize != 8) return false;
uint32_t c = strtoul(in, NULL, 16);
if (inputSize == 6) {
rgb[0] = (c >> 16);
rgb[1] = (c >> 8);
rgb[2] = c ;
} else {
rgb[0] = (c >> 24);
rgb[1] = (c >> 16);
rgb[2] = (c >> 8);
rgb[3] = c ;
}
return true;
}
static inline float minf(float v, float w)
{
if (w > v) return v;
return w;
}
static inline float maxf(float v, float w)
{
if (w > v) return w;
return v;
}
// adjust RGB values based on color temperature in K (range [2800-10200]) (https://en.wikipedia.org/wiki/Color_balance)
// called from bus manager when color correction is enabled!
uint32_t colorBalanceFromKelvin(uint16_t kelvin, uint32_t rgb)
{
//remember so that slow colorKtoRGB() doesn't have to run for every setPixelColor()
static byte correctionRGB[4] = {0,0,0,0};
static uint16_t lastKelvin = 0;
if (lastKelvin != kelvin) colorKtoRGB(kelvin, correctionRGB); // convert Kelvin to RGB
lastKelvin = kelvin;
byte rgbw[4];
rgbw[0] = ((uint16_t) correctionRGB[0] * R(rgb)) /255; // correct R
rgbw[1] = ((uint16_t) correctionRGB[1] * G(rgb)) /255; // correct G
rgbw[2] = ((uint16_t) correctionRGB[2] * B(rgb)) /255; // correct B
rgbw[3] = W(rgb);
return RGBW32(rgbw[0],rgbw[1],rgbw[2],rgbw[3]);
}
//approximates a Kelvin color temperature from an RGB color.
//this does no check for the "whiteness" of the color,
//so should be used combined with a saturation check (as done by auto-white)
//values from http://www.vendian.org/mncharity/dir3/blackbody/UnstableURLs/bbr_color.html (10deg)
//equation spreadsheet at https://bit.ly/30RkHaN
//accuracy +-50K from 1900K up to 8000K
//minimum returned: 1900K, maximum returned: 10091K (range of 8192)
uint16_t approximateKelvinFromRGB(uint32_t rgb) {
//if not either red or blue is 255, color is dimmed. Scale up
uint8_t r = R(rgb), b = B(rgb);
if (r == b) return 6550; //red == blue at about 6600K (also can't go further if both R and B are 0)
if (r > b) {
//scale blue up as if red was at 255
uint16_t scale = 0xFFFF / r; //get scale factor (range 257-65535)
b = ((uint16_t)b * scale) >> 8;
//For all temps K<6600 R is bigger than B (for full bri colors R=255)
//-> Use 9 linear approximations for blackbody radiation blue values from 2000-6600K (blue is always 0 below 2000K)
if (b < 33) return 1900 + b *6;
if (b < 72) return 2100 + (b-33) *10;
if (b < 101) return 2492 + (b-72) *14;
if (b < 132) return 2900 + (b-101) *16;
if (b < 159) return 3398 + (b-132) *19;
if (b < 186) return 3906 + (b-159) *22;
if (b < 210) return 4500 + (b-186) *25;
if (b < 230) return 5100 + (b-210) *30;
return 5700 + (b-230) *34;
} else {
//scale red up as if blue was at 255
uint16_t scale = 0xFFFF / b; //get scale factor (range 257-65535)
r = ((uint16_t)r * scale) >> 8;
//For all temps K>6600 B is bigger than R (for full bri colors B=255)
//-> Use 2 linear approximations for blackbody radiation red values from 6600-10091K (blue is always 0 below 2000K)
if (r > 225) return 6600 + (254-r) *50;
uint16_t k = 8080 + (225-r) *86;
return (k > 10091) ? 10091 : k;
}
}
// gamma lookup table used for color correction (filled on 1st use (cfg.cpp & set.cpp))
uint8_t NeoGammaWLEDMethod::gammaT[256];
// re-calculates & fills gamma table
void NeoGammaWLEDMethod::calcGammaTable(float gamma)
{
for (size_t i = 0; i < 256; i++) {
gammaT[i] = (int)(powf((float)i / 255.0f, gamma) * 255.0f + 0.5f);
}
}
uint8_t IRAM_ATTR_YN NeoGammaWLEDMethod::Correct(uint8_t value)
{
if (!gammaCorrectCol) return value;
return gammaT[value];
}
// used for color gamma correction
uint32_t IRAM_ATTR_YN NeoGammaWLEDMethod::Correct32(uint32_t color)
{
if (!gammaCorrectCol) return color;
uint8_t w = W(color);
uint8_t r = R(color);
uint8_t g = G(color);
uint8_t b = B(color);
w = gammaT[w];
r = gammaT[r];
g = gammaT[g];
b = gammaT[b];
return RGBW32(r, g, b, w);
}
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