forked from tTh/FloatImg
96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
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/*
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* FloatImg library
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* HUE - SATURATION - VALUE
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include "../floatimg.h"
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extern int verbosity;
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/* --------------------------------------------------------------------- */
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/* helper functions */
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static float maxi3f(float a, float b, float c)
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{
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return ((a > b)? (a > c ? a : c) : (b > c ? b : c));
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}
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static float mini3f(float a, float b, float c)
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{
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return ((a < b)? (a < c ? a : c) : (b < c ? b : c));
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}
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static int pseudoeq(float a, float b)
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{
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return (fabsf(a-b)<0.00000000000001); // UGLY HACK ???
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}
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/* --------------------------------------------------------------------- */
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/*
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* WARNING : ALL THIS CODE IS SHIT
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*/
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int fimg_rgb2hsv(float rgb[3], float hsv[3], float scale)
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{
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// float h, s, v;
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float cmin, cmax, diff;
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// scale input value to [0..1]
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rgb[0] /= scale; rgb[1] /= scale; rgb[2] /= scale;
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hsv[0] = hsv[1] = hsv[2] = -12345.6789;
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cmin = mini3f(rgb[0], rgb[1], rgb[2]);
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cmax = maxi3f(rgb[0], rgb[1], rgb[2]);
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diff = cmax - cmin;
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if (pseudoeq(cmax, cmin)) hsv[0] = 0.0;
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else if (pseudoeq(cmax, rgb[0]))
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hsv[0] = fmod((60 * ((rgb[1] - rgb[2]) / diff) + 360), 360.0);
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else if (pseudoeq(cmax, rgb[1]))
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hsv[0] = fmod((60 * ((rgb[2] - rgb[0]) / diff) + 120), 360.0);
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else if (pseudoeq(cmax, rgb[2]))
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hsv[0] = fmod((60 * ((rgb[0] - rgb[1]) / diff) + 240), 360.0);
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if (pseudoeq(cmax, 0.0)) hsv[1] = 0.0;
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else hsv[1] = (diff / cmax) / 100.0;
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hsv[2] = cmax * 100.0; /* WHAT THE FUCK ? */
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#if DEBUG_LEVEL
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fprintf(stderr, "cmin/cmax %f %f\n", cmin, cmax);
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#endif
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return 0;
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}
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/* --------------------------------------------------------------------- */
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int fimg_essai_hsv(char *fname)
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{
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float colors[3], values[3];
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int foo, r, g, b;
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#define INC 16
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for (r=0; r<255; r+=INC) {
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for (g=0; g<255; g+=INC) {
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for (b=0; b<255; b+=INC) {
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printf("%4d %4d %4d ", r, g, b);
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colors[0] = (float)r;
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colors[1] = (float)g;
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colors[2] = (float)b;
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foo = fimg_rgb2hsv(colors, values, 255.0);
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if (foo) {
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exit(1);
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}
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printf(" %9.5f %9.5f %9.5f\n",
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values[0], values[1], values[2]);
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}
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}
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}
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return -1;
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}
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/* --------------------------------------------------------------------- */
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