110 lines
2.5 KiB
C
110 lines
2.5 KiB
C
/*
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* FloatImg library from tTh - really ugly code inside
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*/
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#include <stdio.h>
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#include "../floatimg.h"
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/* -------------------------------------------------------------- */
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/* global vars exported from main
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*/
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extern int verbosity;
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/* -------------------------------------------------------------- */
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/*
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* parameter mix is between 0.0 and 1.0 but other
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* values give sometime good vibrations.
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*/
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int fimg_mix_rgb_gray(FloatImg *img, float mix)
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{
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int x, y, p;
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float gr;
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if (FIMG_TYPE_RGB != img->type) {
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fprintf(stderr, "%s bad type\n", __func__);
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return -6;
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}
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for (y=0; y<img->height; y++) {
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p = y * img->width; /* first pixel of the row */
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for (x=0; x<img->width; x++) {
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gr = (img->R[p] + img->G[p] + img->R[p]) / 3.0;
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img->R[p] = ((gr * mix) + (img->R[p] * (1.0-mix))) / 2.0;
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img->G[p] = ((gr * mix) + (img->G[p] * (1.0-mix))) / 2.0;
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img->B[p] = ((gr * mix) + (img->B[p] * (1.0-mix))) / 2.0;
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p++; /* next pixel in the row */
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}
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}
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return 0;
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}
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/* -------------------------------------------------------------- */
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/*
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* The third parameter was a six value array with min and max
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* values maybe computed by the 'fimg_get_minmax_rgb' function.
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*/
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int fimg_shift_to_zero(FloatImg *s, FloatImg *d, float coefs[6])
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{
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int sz, idx;
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if (FIMG_TYPE_RGB != s->type) {
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fprintf(stderr, "%s bad type\n", __func__);
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return -6;
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}
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sz = s->width * s->height;
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for (idx=0; idx<sz; idx++) {
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d->R[idx] = s->R[idx] - coefs[0];
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d->G[idx] = s->G[idx] - coefs[2];
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d->B[idx] = s->B[idx] - coefs[4];
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}
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return 0;
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}
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/* -------------------------------------------------------------- */
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/*
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* I think that this function is fully buggy, and need
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* more explanations.
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*/
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int fimg_auto_shift_to_zero(FloatImg *src, FloatImg *dst)
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{
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float coefs[6];
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int foo;
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float minima = 1e7; /* magic value ? */
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#if DEBUG_LEVEL
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fprintf(stderr, ">>> %s ( %p %p )\n", __func__, src, dst);
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#endif
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if (FIMG_TYPE_RGB != src->type) {
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fprintf(stderr, "%s: bad image type %d\n", __func__, src->type);
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return -6;
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}
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foo = fimg_get_minmax_rgb(src, coefs);
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if (foo) {
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fprintf(stderr, "%s: err %d get minmax\n", __func__, foo);
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return foo;
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}
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/* crude hack for now */
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if (coefs[0] < minima) minima = coefs[0];
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if (coefs[2] < minima) minima = coefs[2];
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if (coefs[4] < minima) minima = coefs[4];
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coefs[0] = coefs[2] = coefs[4] = minima;
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foo = fimg_shift_to_zero(src, dst, coefs);
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if (foo) {
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fprintf(stderr, "%s WTF?\n", __func__);
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return foo;
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}
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return 0;
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}
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/* -------------------------------------------------------------- */
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