40 lines
942 B
C
40 lines
942 B
C
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#include <math.h>
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#include "color.h"
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void hsv_to_rgb(struct hsvf *hsv, struct rgbf *rgb) {
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float h = hsv->h, s = hsv->s, v = hsv->v;
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float c = v * s; // Chroma
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float hmod = fmodf(h * 6.0f, 6.0f);
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float x = c * (1.0f - fabsf(fmodf(hmod, 2.0f) - 1.0f));
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float m = v - c;
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switch ((int)hmod) {
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case 0:
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rgb->r = c; rgb->g = x; rgb->b = 0;
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break;
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case 1:
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rgb->r = x; rgb->g = c; rgb->b = 0;
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break;
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case 2:
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rgb->r = 0; rgb->g = c; rgb->b = x;
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break;
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case 3:
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rgb->r = 0; rgb->g = x; rgb->b = c;
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break;
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case 4:
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rgb->r = x; rgb->g = 0; rgb->b = c;
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break;
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case 5:
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rgb->r = c; rgb->g = 0; rgb->b = x;
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break;
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default:
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rgb->r = 0; rgb->g = 0; rgb->b = 0;
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}
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rgb->r += m;
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rgb->g += m;
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rgb->b += m;
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}
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