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87 lines
1.8 KiB
C++
87 lines
1.8 KiB
C++
/* hsv2rgb.c
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* Convert Hue Saturation Value to Red Green Blue
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*
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* P.J. 08-Aug-98
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*
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* Reference:
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* D. F. Rogers
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* Procedural Elements for Computer Graphics
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* McGraw Hill 1985
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*/
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#include "base/colorutil.h"
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uint32_t whiteAlpha(float alpha) {
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if (alpha < 0.0f) alpha = 0.0f;
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if (alpha > 1.0f) alpha = 1.0f;
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uint32_t color = (int)(alpha*255)<<24;
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color |= 0xFFFFFF;
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return color;
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}
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uint32_t blackAlpha(float alpha) {
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if (alpha < 0.0f) alpha = 0.0f;
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if (alpha > 1.0f) alpha = 1.0f;
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return (int)(alpha*255)<<24;
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}
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uint32_t rgba(float r, float g, float b, float alpha) {
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uint32_t color = (int)(alpha*255)<<24;
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color |= (int)(b*255)<<16;
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color |= (int)(g*255)<<8;
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color |= (int)(r*255);
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return color;
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}
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uint32_t rgba_clamp(float r, float g, float b, float a) {
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if (r > 1.0f) r = 1.0f;
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if (g > 1.0f) g = 1.0f;
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if (b > 1.0f) b = 1.0f;
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if (a > 1.0f) a = 1.0f;
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if (r < 0.0f) r = 0.0f;
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if (g < 0.0f) g = 0.0f;
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if (b < 0.0f) b = 0.0f;
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if (a < 0.0f) a = 0.0f;
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return rgba(r,g,b,a);
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}
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uint32_t hsva(float H, float S, float V, float alpha) {
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/*
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* Purpose:
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* Convert HSV values to RGB values
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* All values are in the range [0.0 .. 1.0]
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*/
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float F, M, N, K;
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int I;
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float r, g, b;
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if ( S == 0.0 ) {
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// Achromatic case, set level of grey
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return rgba(V, V, V, alpha);
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} else {
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/*
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* Determine levels of primary colours.
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*/
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if (H >= 1.0) {
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H = 0.0;
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} else {
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H = H * 6;
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}
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I = (int) H; /* should be in the range 0..5 */
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F = H - I; /* fractional part */
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M = V * (1 - S);
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N = V * (1 - S * F);
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K = V * (1 - S * (1 - F));
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if (I == 0) { r = V; g = K; b = M; }
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if (I == 1) { r = N; g = V; b = M; }
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if (I == 2) { r = M; g = V; b = K; }
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if (I == 3) { r = M; g = N; b = V; }
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if (I == 4) { r = K; g = M; b = V; }
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if (I == 5) { r = V; g = M; b = N; }
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return rgba(r, g, b, alpha);
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}
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}
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