298 lines
9.0 KiB
C++
298 lines
9.0 KiB
C++
#include "wled.h"
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/*
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* Color conversion methods
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*/
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void colorFromUint32(uint32_t in, bool secondary)
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{
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byte *_col = secondary ? colSec : col;
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_col[0] = R(in);
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_col[1] = G(in);
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_col[2] = B(in);
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_col[3] = W(in);
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}
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//load a color without affecting the white channel
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void colorFromUint24(uint32_t in, bool secondary)
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{
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byte *_col = secondary ? colSec : col;
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_col[0] = R(in);
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_col[1] = G(in);
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_col[2] = B(in);
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}
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//relatively change white brightness, minumum A=5
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void relativeChangeWhite(int8_t amount, byte lowerBoundary)
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{
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int16_t new_val = (int16_t) col[3] + amount;
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if (new_val > 0xFF) new_val = 0xFF;
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else if (new_val < lowerBoundary) new_val = lowerBoundary;
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col[3] = new_val;
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}
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void colorHStoRGB(uint16_t hue, byte sat, byte* rgb) //hue, sat to rgb
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{
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float h = ((float)hue)/65535.0;
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float s = ((float)sat)/255.0;
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byte i = floor(h*6);
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float f = h * 6-i;
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float p = 255 * (1-s);
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float q = 255 * (1-f*s);
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float t = 255 * (1-(1-f)*s);
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switch (i%6) {
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case 0: rgb[0]=255,rgb[1]=t,rgb[2]=p;break;
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case 1: rgb[0]=q,rgb[1]=255,rgb[2]=p;break;
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case 2: rgb[0]=p,rgb[1]=255,rgb[2]=t;break;
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case 3: rgb[0]=p,rgb[1]=q,rgb[2]=255;break;
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case 4: rgb[0]=t,rgb[1]=p,rgb[2]=255;break;
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case 5: rgb[0]=255,rgb[1]=p,rgb[2]=q;
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}
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}
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//get RGB values from color temperature in K (https://tannerhelland.com/2012/09/18/convert-temperature-rgb-algorithm-code.html)
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void colorKtoRGB(uint16_t kelvin, byte* rgb) //white spectrum to rgb, calc
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{
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float r = 0, g = 0, b = 0;
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float temp = kelvin / 100;
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if (temp <= 66) {
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r = 255;
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g = round(99.4708025861 * log(temp) - 161.1195681661);
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if (temp <= 19) {
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b = 0;
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} else {
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b = round(138.5177312231 * log((temp - 10)) - 305.0447927307);
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}
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} else {
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r = round(329.698727446 * pow((temp - 60), -0.1332047592));
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g = round(288.1221695283 * pow((temp - 60), -0.0755148492));
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b = 255;
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}
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//g += 12; //mod by Aircoookie, a bit less accurate but visibly less pinkish
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rgb[0] = (uint8_t) constrain(r, 0, 255);
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rgb[1] = (uint8_t) constrain(g, 0, 255);
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rgb[2] = (uint8_t) constrain(b, 0, 255);
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rgb[3] = 0;
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}
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void colorCTtoRGB(uint16_t mired, byte* rgb) //white spectrum to rgb, bins
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{
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//this is only an approximation using WS2812B with gamma correction enabled
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if (mired > 475) {
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rgb[0]=255;rgb[1]=199;rgb[2]=92;//500
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} else if (mired > 425) {
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rgb[0]=255;rgb[1]=213;rgb[2]=118;//450
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} else if (mired > 375) {
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rgb[0]=255;rgb[1]=216;rgb[2]=118;//400
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} else if (mired > 325) {
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rgb[0]=255;rgb[1]=234;rgb[2]=140;//350
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} else if (mired > 275) {
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rgb[0]=255;rgb[1]=243;rgb[2]=160;//300
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} else if (mired > 225) {
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rgb[0]=250;rgb[1]=255;rgb[2]=188;//250
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} else if (mired > 175) {
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rgb[0]=247;rgb[1]=255;rgb[2]=215;//200
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} else {
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rgb[0]=237;rgb[1]=255;rgb[2]=239;//150
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}
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}
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#ifndef WLED_DISABLE_HUESYNC
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void colorXYtoRGB(float x, float y, byte* rgb) //coordinates to rgb (https://www.developers.meethue.com/documentation/color-conversions-rgb-xy)
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{
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float z = 1.0f - x - y;
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float X = (1.0f / y) * x;
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float Z = (1.0f / y) * z;
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float r = (int)255*(X * 1.656492f - 0.354851f - Z * 0.255038f);
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float g = (int)255*(-X * 0.707196f + 1.655397f + Z * 0.036152f);
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float b = (int)255*(X * 0.051713f - 0.121364f + Z * 1.011530f);
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if (r > b && r > g && r > 1.0f) {
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// red is too big
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g = g / r;
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b = b / r;
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r = 1.0f;
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} else if (g > b && g > r && g > 1.0f) {
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// green is too big
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r = r / g;
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b = b / g;
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g = 1.0f;
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} else if (b > r && b > g && b > 1.0f) {
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// blue is too big
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r = r / b;
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g = g / b;
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b = 1.0f;
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}
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// Apply gamma correction
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r = r <= 0.0031308f ? 12.92f * r : (1.0f + 0.055f) * pow(r, (1.0f / 2.4f)) - 0.055f;
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g = g <= 0.0031308f ? 12.92f * g : (1.0f + 0.055f) * pow(g, (1.0f / 2.4f)) - 0.055f;
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b = b <= 0.0031308f ? 12.92f * b : (1.0f + 0.055f) * pow(b, (1.0f / 2.4f)) - 0.055f;
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if (r > b && r > g) {
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// red is biggest
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if (r > 1.0f) {
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g = g / r;
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b = b / r;
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r = 1.0f;
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}
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} else if (g > b && g > r) {
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// green is biggest
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if (g > 1.0f) {
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r = r / g;
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b = b / g;
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g = 1.0f;
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}
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} else if (b > r && b > g) {
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// blue is biggest
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if (b > 1.0f) {
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r = r / b;
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g = g / b;
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b = 1.0f;
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}
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}
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rgb[0] = 255.0*r;
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rgb[1] = 255.0*g;
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rgb[2] = 255.0*b;
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}
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void colorRGBtoXY(byte* rgb, float* xy) //rgb to coordinates (https://www.developers.meethue.com/documentation/color-conversions-rgb-xy)
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{
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float X = rgb[0] * 0.664511f + rgb[1] * 0.154324f + rgb[2] * 0.162028f;
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float Y = rgb[0] * 0.283881f + rgb[1] * 0.668433f + rgb[2] * 0.047685f;
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float Z = rgb[0] * 0.000088f + rgb[1] * 0.072310f + rgb[2] * 0.986039f;
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xy[0] = X / (X + Y + Z);
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xy[1] = Y / (X + Y + Z);
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}
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#endif // WLED_DISABLE_HUESYNC
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//RRGGBB / WWRRGGBB order for hex
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void colorFromDecOrHexString(byte* rgb, char* in)
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{
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if (in[0] == 0) return;
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char first = in[0];
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uint32_t c = 0;
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if (first == '#' || first == 'h' || first == 'H') //is HEX encoded
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{
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c = strtoul(in +1, NULL, 16);
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} else
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{
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c = strtoul(in, NULL, 10);
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}
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rgb[0] = R(c);
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rgb[1] = G(c);
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rgb[2] = B(c);
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rgb[3] = W(c);
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}
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//contrary to the colorFromDecOrHexString() function, this uses the more standard RRGGBB / RRGGBBWW order
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bool colorFromHexString(byte* rgb, const char* in) {
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if (in == nullptr) return false;
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size_t inputSize = strnlen(in, 9);
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if (inputSize != 6 && inputSize != 8) return false;
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uint32_t c = strtoul(in, NULL, 16);
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if (inputSize == 6) {
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rgb[0] = (c >> 16);
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rgb[1] = (c >> 8);
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rgb[2] = c ;
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} else {
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rgb[0] = (c >> 24);
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rgb[1] = (c >> 16);
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rgb[2] = (c >> 8);
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rgb[3] = c ;
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}
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return true;
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}
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float minf (float v, float w)
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{
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if (w > v) return v;
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return w;
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}
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float maxf (float v, float w)
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{
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if (w > v) return w;
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return v;
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}
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/*
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uint32_t colorRGBtoRGBW(uint32_t c)
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{
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byte rgb[4];
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rgb[0] = R(c);
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rgb[1] = G(c);
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rgb[2] = B(c);
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rgb[3] = W(c);
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colorRGBtoRGBW(rgb);
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return RGBW32(rgb[0], rgb[1], rgb[2], rgb[3]);
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}
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void colorRGBtoRGBW(byte* rgb) //rgb to rgbw (http://codewelt.com/rgbw). (RGBW_MODE_LEGACY)
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{
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float low = minf(rgb[0],minf(rgb[1],rgb[2]));
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float high = maxf(rgb[0],maxf(rgb[1],rgb[2]));
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if (high < 0.1f) return;
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float sat = 100.0f * ((high - low) / high); // maximum saturation is 100 (corrected from 255)
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rgb[3] = (byte)((255.0f - sat) / 255.0f * (rgb[0] + rgb[1] + rgb[2]) / 3);
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}
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*/
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byte correctionRGB[4] = {0,0,0,0};
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uint16_t lastKelvin = 0;
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// adjust RGB values based on color temperature in K (range [2800-10200]) (https://en.wikipedia.org/wiki/Color_balance)
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uint32_t colorBalanceFromKelvin(uint16_t kelvin, uint32_t rgb)
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{
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//remember so that slow colorKtoRGB() doesn't have to run for every setPixelColor()
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if (lastKelvin != kelvin) colorKtoRGB(kelvin, correctionRGB); // convert Kelvin to RGB
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lastKelvin = kelvin;
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byte rgbw[4];
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rgbw[0] = ((uint16_t) correctionRGB[0] * R(rgb)) /255; // correct R
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rgbw[1] = ((uint16_t) correctionRGB[1] * G(rgb)) /255; // correct G
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rgbw[2] = ((uint16_t) correctionRGB[2] * B(rgb)) /255; // correct B
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rgbw[3] = W(rgb);
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return RGBW32(rgbw[0],rgbw[1],rgbw[2],rgbw[3]);
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}
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//approximates a Kelvin color temperature from an RGB color.
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//this does no check for the "whiteness" of the color,
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//so should be used combined with a saturation check (as done by auto-white)
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//values from http://www.vendian.org/mncharity/dir3/blackbody/UnstableURLs/bbr_color.html (10deg)
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//equation spreadsheet at https://bit.ly/30RkHaN
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//accuracy +-50K from 1900K up to 8000K
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//minimum returned: 1900K, maximum returned: 10091K (range of 8192)
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uint16_t approximateKelvinFromRGB(uint32_t rgb) {
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//if not either red or blue is 255, color is dimmed. Scale up
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uint8_t r = R(rgb), b = B(rgb);
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if (r == b) return 6550; //red == blue at about 6600K (also can't go further if both R and B are 0)
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if (r > b) {
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//scale blue up as if red was at 255
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uint16_t scale = 0xFFFF / r; //get scale factor (range 257-65535)
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b = ((uint16_t)b * scale) >> 8;
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//For all temps K<6600 R is bigger than B (for full bri colors R=255)
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//-> Use 9 linear approximations for blackbody radiation blue values from 2000-6600K (blue is always 0 below 2000K)
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if (b < 33) return 1900 + b *6;
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if (b < 72) return 2100 + (b-33) *10;
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if (b < 101) return 2492 + (b-72) *14;
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if (b < 132) return 2900 + (b-101) *16;
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if (b < 159) return 3398 + (b-132) *19;
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if (b < 186) return 3906 + (b-159) *22;
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if (b < 210) return 4500 + (b-186) *25;
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if (b < 230) return 5100 + (b-210) *30;
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return 5700 + (b-230) *34;
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} else {
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//scale red up as if blue was at 255
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uint16_t scale = 0xFFFF / b; //get scale factor (range 257-65535)
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r = ((uint16_t)r * scale) >> 8;
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//For all temps K>6600 B is bigger than R (for full bri colors B=255)
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//-> Use 2 linear approximations for blackbody radiation red values from 6600-10091K (blue is always 0 below 2000K)
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if (r > 225) return 6600 + (254-r) *50;
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uint16_t k = 8080 + (225-r) *86;
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return (k > 10091) ? 10091 : k;
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}
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}
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