WLED/wled00/colors.cpp

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#include "wled.h"
/*
* Color conversion methods
*/
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void colorFromUint32(uint32_t in, bool secondary)
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{
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if (secondary) {
colSec[3] = in >> 24 & 0xFF;
colSec[0] = in >> 16 & 0xFF;
colSec[1] = in >> 8 & 0xFF;
colSec[2] = in & 0xFF;
} else {
col[3] = in >> 24 & 0xFF;
col[0] = in >> 16 & 0xFF;
col[1] = in >> 8 & 0xFF;
col[2] = in & 0xFF;
}
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}
//load a color without affecting the white channel
void colorFromUint24(uint32_t in, bool secondary)
{
if (secondary) {
colSec[0] = in >> 16 & 0xFF;
colSec[1] = in >> 8 & 0xFF;
colSec[2] = in & 0xFF;
} else {
col[0] = in >> 16 & 0xFF;
col[1] = in >> 8 & 0xFF;
col[2] = in & 0xFF;
}
}
//relatively change white brightness, minumum A=5
void relativeChangeWhite(int8_t amount, byte lowerBoundary)
{
int16_t new_val = (int16_t) col[3] + amount;
if (new_val > 0xFF) new_val = 0xFF;
else if (new_val < lowerBoundary) new_val = lowerBoundary;
col[3] = new_val;
}
void colorHStoRGB(uint16_t hue, byte sat, byte* rgb) //hue, sat to rgb
{
float h = ((float)hue)/65535.0;
float s = ((float)sat)/255.0;
byte i = floor(h*6);
float f = h * 6-i;
float p = 255 * (1-s);
float q = 255 * (1-f*s);
float t = 255 * (1-(1-f)*s);
switch (i%6) {
case 0: rgb[0]=255,rgb[1]=t,rgb[2]=p;break;
case 1: rgb[0]=q,rgb[1]=255,rgb[2]=p;break;
case 2: rgb[0]=p,rgb[1]=255,rgb[2]=t;break;
case 3: rgb[0]=p,rgb[1]=q,rgb[2]=255;break;
case 4: rgb[0]=t,rgb[1]=p,rgb[2]=255;break;
case 5: rgb[0]=255,rgb[1]=p,rgb[2]=q;
}
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if (useRGBW && strip.rgbwMode == RGBW_MODE_LEGACY) colorRGBtoRGBW(col);
}
void colorKtoRGB(uint16_t kelvin, byte* rgb) //white spectrum to rgb, calc
{
float r = 0, g = 0, b = 0;
float temp = kelvin / 100;
if (temp <= 66) {
r = 255;
g = round(99.4708025861 * log(temp) - 161.1195681661);
if (temp <= 19) {
b = 0;
} else {
b = round(138.5177312231 * log((temp - 10)) - 305.0447927307);
}
} else {
r = round(329.698727446 * pow((temp - 60), -0.1332047592));
g = round(288.1221695283 * pow((temp - 60), -0.0755148492));
b = 255;
}
g += 15; //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
}
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if (useRGBW && strip.rgbwMode == RGBW_MODE_LEGACY) colorRGBtoRGBW(col);
}
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#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) * pow(r, (1.0f / 2.4f)) - 0.055f;
g = g <= 0.0031308f ? 12.92f * g : (1.0f + 0.055f) * pow(g, (1.0f / 2.4f)) - 0.055f;
b = b <= 0.0031308f ? 12.92f * b : (1.0f + 0.055f) * pow(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] = 255.0*r;
rgb[1] = 255.0*g;
rgb[2] = 255.0*b;
if (useRGBW && strip.rgbwMode == RGBW_MODE_LEGACY) colorRGBtoRGBW(col);
}
void colorRGBtoXY(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, 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[3] = (c >> 24) & 0xFF;
rgb[0] = (c >> 16) & 0xFF;
rgb[1] = (c >> 8) & 0xFF;
rgb[2] = c & 0xFF;
}
//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) & 0xFF;
rgb[1] = (c >> 8) & 0xFF;
rgb[2] = c & 0xFF;
} else {
rgb[0] = (c >> 24) & 0xFF;
rgb[1] = (c >> 16) & 0xFF;
rgb[2] = (c >> 8) & 0xFF;
rgb[3] = c & 0xFF;
}
return true;
}
float minf (float v, float w)
{
if (w > v) return v;
return w;
}
float maxf (float v, float w)
{
if (w > v) return w;
return v;
}
void colorRGBtoRGBW(byte* rgb) //rgb to rgbw (http://codewelt.com/rgbw). (RGBW_MODE_LEGACY)
{
float low = minf(rgb[0],minf(rgb[1],rgb[2]));
float high = maxf(rgb[0],maxf(rgb[1],rgb[2]));
if (high < 0.1f) return;
float sat = 100.0f * ((high - low) / high);; // maximum saturation is 100 (corrected from 255)
rgb[3] = (byte)((255.0f - sat) / 255.0f * (rgb[0] + rgb[1] + rgb[2]) / 3);
}