372 lines
12 KiB
C++
372 lines
12 KiB
C++
#include "wled.h"
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/*
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* Color conversion & utility methods
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*/
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/*
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* color blend function
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*/
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uint32_t color_blend(uint32_t color1, uint32_t color2, uint16_t blend, bool b16) {
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if(blend == 0) return color1;
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uint16_t blendmax = b16 ? 0xFFFF : 0xFF;
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if(blend == blendmax) return color2;
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uint8_t shift = b16 ? 16 : 8;
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uint32_t w1 = W(color1);
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uint32_t r1 = R(color1);
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uint32_t g1 = G(color1);
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uint32_t b1 = B(color1);
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uint32_t w2 = W(color2);
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uint32_t r2 = R(color2);
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uint32_t g2 = G(color2);
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uint32_t b2 = B(color2);
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uint32_t w3 = ((w2 * blend) + (w1 * (blendmax - blend))) >> shift;
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uint32_t r3 = ((r2 * blend) + (r1 * (blendmax - blend))) >> shift;
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uint32_t g3 = ((g2 * blend) + (g1 * (blendmax - blend))) >> shift;
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uint32_t b3 = ((b2 * blend) + (b1 * (blendmax - blend))) >> shift;
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return RGBW32(r3, g3, b3, w3);
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}
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/*
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* color add function that preserves ratio
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* idea: https://github.com/Aircoookie/WLED/pull/2465 by https://github.com/Proto-molecule
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*/
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uint32_t color_add(uint32_t c1, uint32_t c2)
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{
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uint32_t r = R(c1) + R(c2);
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uint32_t g = G(c1) + G(c2);
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uint32_t b = B(c1) + B(c2);
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uint32_t w = W(c1) + W(c2);
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uint16_t max = r;
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if (g > max) max = g;
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if (b > max) max = b;
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if (w > max) max = w;
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if (max < 256) return RGBW32(r, g, b, w);
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else return RGBW32(r * 255 / max, g * 255 / max, b * 255 / max, w * 255 / max);
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}
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void setRandomColor(byte* rgb)
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{
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lastRandomIndex = strip.getMainSegment().get_random_wheel_index(lastRandomIndex);
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colorHStoRGB(lastRandomIndex*256,255,rgb);
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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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//gamma 2.8 lookup table used for color correction
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static byte gammaT[] = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2,
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2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5,
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5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10,
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10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16,
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17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25,
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25, 26, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 35, 36,
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37, 38, 39, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 50,
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51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68,
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69, 70, 72, 73, 74, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89,
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90, 92, 93, 95, 96, 98, 99,101,102,104,105,107,109,110,112,114,
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115,117,119,120,122,124,126,127,129,131,133,135,137,138,140,142,
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144,146,148,150,152,154,156,158,160,162,164,167,169,171,173,175,
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177,180,182,184,186,189,191,193,196,198,200,203,205,208,210,213,
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215,218,220,223,225,228,231,233,236,239,241,244,247,249,252,255 };
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uint8_t gamma8_cal(uint8_t b, float gamma)
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{
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return (int)(powf((float)b / 255.0f, gamma) * 255.0f + 0.5f);
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}
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void calcGammaTable(float gamma)
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{
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for (uint16_t i = 0; i < 256; i++) {
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gammaT[i] = gamma8_cal(i, gamma);
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}
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}
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uint8_t gamma8(uint8_t b)
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{
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return gammaT[b];
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}
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uint32_t gamma32(uint32_t color)
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{
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if (!gammaCorrectCol) return color;
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uint8_t w = W(color);
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uint8_t r = R(color);
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uint8_t g = G(color);
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uint8_t b = B(color);
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w = gammaT[w];
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r = gammaT[r];
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g = gammaT[g];
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b = gammaT[b];
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return RGBW32(r, g, b, w);
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}
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