619 lines
14 KiB
C
619 lines
14 KiB
C
#include "BH/Common.h"
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#include <BH/Color.h>
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#include <math.h>
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#define MIN(a,b) (((a)<(b))?(a):(b))
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#define MAX(a,b) (((a)>(b))?(a):(b))
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/* Conversion between RGB <-> HSL/HSV has error of around ~ 0.009% */
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#define DEGREE_MULT 1.8204444e02f
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void BH_ColorRGBA8(const BH_Color *color,
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uint8_t *r,
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uint8_t *g,
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uint8_t *b,
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uint8_t *a)
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{
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BH_Color tmp;
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BH_ColorToRGBA(color, &tmp);
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*r = tmp.data.rgba.r >> 8;
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*g = tmp.data.rgba.g >> 8;
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*b = tmp.data.rgba.b >> 8;
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*a = tmp.data.rgba.a >> 8;
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}
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void BH_ColorRGBA16(const BH_Color *color,
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uint16_t *r,
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uint16_t *g,
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uint16_t *b,
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uint16_t *a)
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{
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BH_Color tmp;
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BH_ColorToRGBA(color, &tmp);
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*r = tmp.data.rgba.r;
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*g = tmp.data.rgba.g;
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*b = tmp.data.rgba.b;
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*a = tmp.data.rgba.a;
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}
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void BH_ColorRGBAf(const BH_Color *color,
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float *r,
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float *g,
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float *b,
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float *a)
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{
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BH_Color tmp;
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BH_ColorToRGBA(color, &tmp);
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*r = tmp.data.rgba.r / 65535.0f;
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*g = tmp.data.rgba.g / 65535.0f;
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*b = tmp.data.rgba.b / 65535.0f;
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*a = tmp.data.rgba.a / 65535.0f;
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}
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void BH_ColorSetRGBA8(BH_Color *color,
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uint8_t r,
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uint8_t g,
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uint8_t b,
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uint8_t a)
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{
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color->type = BH_COLOR_TYPE_RGBA;
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color->data.rgba.r = (uint16_t)r * 0x0101;
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color->data.rgba.g = (uint16_t)g * 0x0101;
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color->data.rgba.b = (uint16_t)b * 0x0101;
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color->data.rgba.a = (uint16_t)a * 0x0101;
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}
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void BH_ColorSetRGBA16(BH_Color *color,
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uint16_t r,
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uint16_t g,
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uint16_t b,
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uint16_t a)
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{
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color->type = BH_COLOR_TYPE_RGBA;
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color->data.rgba.r = r;
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color->data.rgba.g = g;
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color->data.rgba.b = b;
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color->data.rgba.a = a;
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}
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void BH_ColorSetRGBAf(BH_Color *color,
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float r,
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float g,
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float b,
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float a)
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{
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r = MAX(MIN(1.0f, r), 0.0f);
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g = MAX(MIN(1.0f, g), 0.0f);
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b = MAX(MIN(1.0f, b), 0.0f);
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a = MAX(MIN(1.0f, a), 0.0f);
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color->type = BH_COLOR_TYPE_RGBA;
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color->data.rgba.r = r * 65535.0f;
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color->data.rgba.g = g * 65535.0f;
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color->data.rgba.b = b * 65535.0f;
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color->data.rgba.a = a * 65535.0f;
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}
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void BH_ColorHSVAf(const BH_Color *color,
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float *h,
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float *s,
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float *v,
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float *a)
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{
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BH_Color tmp;
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BH_ColorToHSVA(color, &tmp);
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*h = tmp.data.hsva.h / DEGREE_MULT;
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*s = tmp.data.hsva.s / 65535.0f;
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*v = tmp.data.hsva.v / 65535.0f;
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*a = tmp.data.hsva.a / 65535.0f;
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}
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void BH_ColorSetHSVAf(BH_Color *color,
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float h,
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float s,
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float v,
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float a)
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{
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while (h >= 360.0f)
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h -= 360.0f;
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while (h < 0.0f)
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h += 360.0f;
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s = MAX(MIN(1.0f, s), 0.0f);
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v = MAX(MIN(1.0f, v), 0.0f);
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color->type = BH_COLOR_TYPE_HSVA;
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color->data.hsva.h = h * DEGREE_MULT;
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color->data.hsva.s = s * 65535.0f;
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color->data.hsva.v = v * 65535.0f;
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color->data.hsva.a = a * 65535.0f;
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}
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void BH_ColorHSLAf(const BH_Color *color,
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float *h,
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float *s,
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float *l,
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float *a)
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{
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BH_Color tmp;
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BH_ColorToHSLA(color, &tmp);
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*h = tmp.data.hsla.h / DEGREE_MULT;
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*s = tmp.data.hsla.s / 65535.0f;
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*l = tmp.data.hsla.l / 65535.0f;
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*a = tmp.data.hsla.a / 65535.0f;
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}
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void BH_ColorSetHSLAf(BH_Color *color,
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float h,
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float s,
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float l,
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float a)
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{
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while (h >= 360.0f)
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h -= 360.0f;
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while (h < 0.0f)
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h += 360.0f;
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s = MAX(MIN(1.0f, s), 0.0f);
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l = MAX(MIN(1.0f, l), 0.0f);
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color->type = BH_COLOR_TYPE_HSLA;
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color->data.hsla.h = h * DEGREE_MULT;
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color->data.hsla.s = s * 65535;
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color->data.hsla.l = l * 65535;
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color->data.hsla.a = a * 65535;
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}
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/*
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* Transformations between color models are based on:
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* Computer Graphics and Geometric Modeling by Max K. Agoston
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*/
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static void rgbToHsv(const BH_Color *color,
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BH_Color *out)
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{
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float min, max, d, r, g, b, a, h, s, v;
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BH_ColorRGBAf(color, &r, &g, &b, &a);
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max = MAX(MAX(r, g), b);
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min = MIN(MIN(r, g), b);
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v = max;
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s = 0.0f;
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h = 0.0f;
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d = max - min;
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if (max)
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s = d / max;
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if (s)
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{
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if (r == max)
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h = (g - b) / d;
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else if (g == max)
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h = 2 + (b - r) / d;
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else
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h = 4 + (r - g) / d;
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}
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BH_ColorSetHSVAf(out, h * 60.0f, s, v, a);
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}
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static void hsvToRgb(const BH_Color *color,
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BH_Color *out)
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{
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float h, s, v, a, r, g, b, fract, p, q, t;
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int sextant;
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BH_ColorHSVAf(color, &h, &s, &v, &a);
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r = v;
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g = v;
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b = v;
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if (s)
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{
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h /= 60.0f;
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sextant = (int)h;
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fract = h - sextant;
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p = v * (1 - s);
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q = v * (1 - (s * fract));
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t = v * (1 - (s * (1 - fract)));
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switch (sextant)
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{
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case 0: r = v; g = t; b = p; break;
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case 1: r = q; g = v; b = p; break;
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case 2: r = p; g = v; b = t; break;
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case 3: r = p; g = q; b = v; break;
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case 4: r = t; g = p; b = v; break;
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case 5: r = v; g = p; b = q; break;
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}
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}
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BH_ColorSetRGBAf(out, r, g, b, a);
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}
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static void rgbToHsl(const BH_Color *color,
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BH_Color *out)
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{
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float min, max, d, r, g, b, a, h, s, l;
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BH_ColorRGBAf(color, &r, &g, &b, &a);
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max = MAX(MAX(r, g), b);
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min = MIN(MIN(r, g), b);
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l = (max + min) / 2.0;
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s = 0.0f;
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h = 0.0f;
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d = max - min;
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if (max != min)
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{
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if (l <= 0.5f)
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s = d / (max + min);
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else
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s = d / (2.0f - max - min);
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if (r == max)
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h = (g - b) / d;
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else if (g == max)
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h = 2 + (b - r) / d;
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else
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h = 4 + (r - g) / d;
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}
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BH_ColorSetHSLAf(out, h * 60.0f, s, l, a);
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}
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static void hslToHsv(const BH_Color *color,
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BH_Color *out)
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{
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float h, s, l, v, a;
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BH_ColorHSLAf(color, &h, &s, &l, &a);
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v = s * MIN(l, 1.0f - l) + l;
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s = (v) ? (2.0f - 2.0f * l / v) : (0.0f);
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BH_ColorSetHSVAf(out, h, s, v, a);
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}
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static void hsvToHsl(const BH_Color *color,
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BH_Color *out)
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{
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float h, s, v, l, a, m;
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BH_ColorHSVAf(color, &h, &s, &v, &a);
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l = v - v * s / 2.0f;
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m = MIN(l, 1.0f - l);
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s = (m) ? ((v - l) / m) : (0);
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BH_ColorSetHSLAf(out, h, s, l, a);
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}
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void BH_ColorToRGBA(const BH_Color *color,
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BH_Color *out)
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{
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switch (color->type)
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{
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case BH_COLOR_TYPE_RGBA:
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*out = *color;
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break;
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case BH_COLOR_TYPE_HSVA:
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hsvToRgb(color, out);
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break;
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case BH_COLOR_TYPE_HSLA:
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hslToHsv(color, out);
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hsvToRgb(out, out);
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break;
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}
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}
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void BH_ColorToHSVA(const BH_Color *color,
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BH_Color *out)
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{
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switch (color->type)
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{
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case BH_COLOR_TYPE_RGBA:
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rgbToHsv(color, out);
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break;
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case BH_COLOR_TYPE_HSVA:
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*out = *color;
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break;
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case BH_COLOR_TYPE_HSLA:
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hslToHsv(color, out);
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break;
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}
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}
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void BH_ColorToHSLA(const BH_Color *color,
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BH_Color *out)
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{
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switch (color->type)
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{
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case BH_COLOR_TYPE_RGBA:
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rgbToHsl(color, out);
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break;
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case BH_COLOR_TYPE_HSVA:
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hsvToHsl(color, out);
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break;
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case BH_COLOR_TYPE_HSLA:
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*out = *color;
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break;
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}
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}
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static float blendNormal(float foreground,
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float background)
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{
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BH_UNUSED(background);
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return foreground;
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}
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static float blendMultiply(float foreground,
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float background)
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{
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return foreground * background;
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}
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static float blendScreen(float foreground,
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float background)
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{
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return foreground + background - (foreground * background);
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}
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static float blendDarken(float foreground,
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float background)
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{
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return MIN(foreground, background);
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}
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static float blendLighten(float foreground,
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float background)
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{
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return MAX(foreground, background);
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}
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static float blendColorDodge(float foreground,
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float background)
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{
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if (foreground != 1.0f)
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return MIN(1.0f, background / (1.0f - foreground));
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return foreground;
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}
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static float blendColorBurn(float foreground,
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float background)
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{
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if (foreground != 0.0f)
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return 1.0f - MIN(1.0f, (1.0f - background) / foreground);
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return foreground;
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}
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static float blendLinearDodge(float foreground,
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float background)
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{
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return foreground + background;
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}
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static float blendLinearBurn(float foreground,
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float background)
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{
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return foreground + background - 1.0f;
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}
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static float blendDifference(float foreground,
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float background)
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{
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return fabsf(background - foreground);
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}
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static float blendExclusion(float foreground,
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float background)
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{
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return foreground + background - (2.0f * foreground * background);
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}
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static float blendHardLight(float foreground,
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float background)
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{
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if (foreground <= 0.5f)
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return blendMultiply(2.0f * foreground, background);
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else
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return blendScreen(2.0f * foreground - 1.0f, background);
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}
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static float blendSoftLight(float foreground,
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float background)
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{
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return (1.0f - 2.0f * foreground) * background * background + 2.0f * foreground * background;
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}
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static float blendOverlay(float foreground,
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float background)
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{
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return blendHardLight(background, foreground);
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}
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void BH_ColorBlend(const BH_Color *foreground,
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const BH_Color *background,
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int mode,
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BH_Color *dest)
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{
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float br, bg, bb, ba;
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float fr, fg, fb, fa;
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if (mode == BH_COLOR_MODE_HUE || mode == BH_COLOR_MODE_SATURATION ||
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mode == BH_COLOR_MODE_COLOR || mode == BH_COLOR_MODE_LUMINOSITY)
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{
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BH_ColorHSLAf(foreground, &fr, &fg, &fb, &fa);
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BH_ColorHSLAf(background, &br, &bg, &bb, &ba);
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}
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else
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{
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BH_ColorRGBAf(foreground, &fr, &fg, &fb, &fa);
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BH_ColorRGBAf(background, &br, &bg, &bb, &ba);
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}
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switch (mode)
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{
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default:
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case BH_COLOR_MODE_NORMAL:
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fr = blendNormal(fr, br);
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fg = blendNormal(fg, bg);
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fb = blendNormal(fb, bb);
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BH_ColorSetRGBAf(dest, fr, fg, fb, fa);
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break;
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case BH_COLOR_MODE_MULTIPLY:
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fr = blendMultiply(fr, br);
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fg = blendMultiply(fg, bg);
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fb = blendMultiply(fb, bb);
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BH_ColorSetRGBAf(dest, fr, fg, fb, fa);
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break;
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case BH_COLOR_MODE_SCREEN:
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fr = blendScreen(fr, br);
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fg = blendScreen(fg, bg);
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fb = blendScreen(fb, bb);
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BH_ColorSetRGBAf(dest, fr, fg, fb, fa);
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break;
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case BH_COLOR_MODE_OVERLAY:
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fr = blendOverlay(fr, br);
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fg = blendOverlay(fg, bg);
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fb = blendOverlay(fb, bb);
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BH_ColorSetRGBAf(dest, fr, fg, fb, fa);
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break;
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case BH_COLOR_MODE_DARKEN:
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fr = blendDarken(fr, br);
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fg = blendDarken(fg, bg);
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fb = blendDarken(fb, bb);
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BH_ColorSetRGBAf(dest, fr, fg, fb, fa);
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break;
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case BH_COLOR_MODE_LIGHTEN:
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fr = blendLighten(fr, br);
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fg = blendLighten(fg, bg);
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fb = blendLighten(fb, bb);
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BH_ColorSetRGBAf(dest, fr, fg, fb, fa);
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break;
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case BH_COLOR_MODE_COLOR_DODGE:
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fr = blendColorDodge(fr, br);
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fg = blendColorDodge(fg, bg);
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fb = blendColorDodge(fb, bb);
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BH_ColorSetRGBAf(dest, fr, fg, fb, fa);
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break;
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case BH_COLOR_MODE_COLOR_BURN:
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fr = blendColorBurn(fr, br);
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fg = blendColorBurn(fg, bg);
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fb = blendColorBurn(fb, bb);
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BH_ColorSetRGBAf(dest, fr, fg, fb, fa);
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break;
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case BH_COLOR_MODE_LINEAR_DODGE:
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fr = blendLinearDodge(fr, br);
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fg = blendLinearDodge(fg, bg);
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fb = blendLinearDodge(fb, bb);
|
|
BH_ColorSetRGBAf(dest, fr, fg, fb, fa);
|
|
break;
|
|
|
|
case BH_COLOR_MODE_LINEAR_BURN:
|
|
fr = blendLinearBurn(fr, br);
|
|
fg = blendLinearBurn(fg, bg);
|
|
fb = blendLinearBurn(fb, bb);
|
|
BH_ColorSetRGBAf(dest, fr, fg, fb, fa);
|
|
break;
|
|
|
|
case BH_COLOR_MODE_HARD_LIGHT:
|
|
fr = blendHardLight(fr, br);
|
|
fg = blendHardLight(fg, bg);
|
|
fb = blendHardLight(fb, bb);
|
|
BH_ColorSetRGBAf(dest, fr, fg, fb, fa);
|
|
break;
|
|
|
|
case BH_COLOR_MODE_SOFT_LIGHT:
|
|
fr = blendSoftLight(fr, br);
|
|
fg = blendSoftLight(fg, bg);
|
|
fb = blendSoftLight(fb, bb);
|
|
BH_ColorSetRGBAf(dest, fr, fg, fb, fa);
|
|
break;
|
|
|
|
case BH_COLOR_MODE_DIFFERENCE:
|
|
fr = blendDifference(fr, br);
|
|
fg = blendDifference(fg, bg);
|
|
fb = blendDifference(fb, bb);
|
|
BH_ColorSetRGBAf(dest, fr, fg, fb, fa);
|
|
break;
|
|
|
|
case BH_COLOR_MODE_EXCLUSION:
|
|
fr = blendExclusion(fr, br);
|
|
fg = blendExclusion(fg, bg);
|
|
fb = blendExclusion(fb, bb);
|
|
BH_ColorSetRGBAf(dest, fr, fg, fb, fa);
|
|
break;
|
|
|
|
case BH_COLOR_MODE_HUE:
|
|
BH_ColorSetHSLAf(dest, fr, bg, bb, fa);
|
|
break;
|
|
|
|
case BH_COLOR_MODE_SATURATION:
|
|
BH_ColorSetHSLAf(dest, br, fg, bb, fa);
|
|
break;
|
|
|
|
case BH_COLOR_MODE_COLOR:
|
|
BH_ColorSetHSLAf(dest, fr, fg, bb, fa);
|
|
break;
|
|
|
|
case BH_COLOR_MODE_LUMINOSITY:
|
|
BH_ColorSetHSLAf(dest, br, bg, fb, fa);
|
|
break;
|
|
}
|
|
}
|