127 lines
2.2 KiB
C
127 lines
2.2 KiB
C
/*
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* contrast.c - part of libfloatimg
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.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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/*
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* if the second parameter is NULL, operate 'in-place'
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*/
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int fimg_square_root(FloatImg *s, FloatImg *d, double maxval)
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{
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int nbre, idx;
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double dval;
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if (s->type != FIMG_TYPE_RGB) {
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fprintf(stderr, "%s : type %d invalide\n",
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__func__, s->type);
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return -4;
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}
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if (NULL==d) {
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d = s;
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}
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else {
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if (d->type != FIMG_TYPE_RGB) {
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fprintf(stderr, "%s : dst type %d invalide\n",
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__func__, d->type);
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return -4;
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}
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}
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nbre = s->width * s->height * 3;
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for (idx=0; idx<nbre; idx++) {
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dval = s->R[idx] / maxval;
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d->R[idx] = maxval * sqrt(dval);
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}
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return -1;
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}
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/* ---------------------------------------------------------------- */
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int fimg_power_2(FloatImg *s, FloatImg *d, double maxval)
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{
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int nbre, idx;
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double dval;
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if (s->type != FIMG_TYPE_RGB) {
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fprintf(stderr, "%s : src type %d invalide\n",
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__func__, s->type);
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return -4;
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}
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if (NULL==d) {
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d = s;
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}
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else {
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if (d->type != FIMG_TYPE_RGB) {
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fprintf(stderr, "%s : dst type %d invalide\n",
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__func__, d->type);
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return -4;
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}
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}
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nbre = s->width * s->height * 3;
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for (idx=0; idx<nbre; idx++) {
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dval = s->R[idx] / maxval;
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d->R[idx] = maxval * dval * dval;
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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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#macro Cos_01( X )
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(0.5-0.5*cos( 3.141592654 * X))
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#end
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*/
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int fimg_cos_01(FloatImg *s, FloatImg *d, double maxval)
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{
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int nbre, idx;
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double dval;
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if (s->type != FIMG_TYPE_RGB) {
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fprintf(stderr, "%s : type %d invalide\n",
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__func__, s->type);
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return -4;
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}
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if (NULL==d) {
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d = s;
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}
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else {
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if (d->type != FIMG_TYPE_RGB) {
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fprintf(stderr, "%s : dst type %d invalide\n",
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__func__, d->type);
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return -4;
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}
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}
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nbre = s->width * s->height * 3;
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for (idx=0; idx<nbre; idx++) {
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dval = s->R[idx] / maxval;
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d->R[idx] = maxval * (0.5 - 0.5 * cos(3.141592654*dval));
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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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