411 lines
9.3 KiB
C
411 lines
9.3 KiB
C
/*
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* fimg-math.c
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*
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <string.h>
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#include <float.h> /* for FLT_MAX */
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#include <math.h>
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#include "../floatimg.h"
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extern int verbosity; /* must be declared around main() */
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/* ---------------------------------------------------------------- */
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/* nouveau 27 fevrier 2022 */
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float fimg_get_plane_maxvalue(FloatImg *psrc, char plane)
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{
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float *ptrplane;
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float maxval;
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int area, foo;
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#if DEBUG_LEVEL
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fprintf(stderr, ">>> %s ( %p '%c' )\n", __func__, psrc, plane);
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#endif
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switch (plane) {
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case 'r': case 'R':
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ptrplane = psrc->R; break;
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case 'g': case 'G':
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ptrplane = psrc->G; break;
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case 'b': case 'B':
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ptrplane = psrc->B; break;
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case 'a': case 'A':
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ptrplane = psrc->A; break;
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default:
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fprintf(stderr, "%s: plane error\n", __func__);
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abort(); break;
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}
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area = psrc->width * psrc->height;
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maxval = 0.0;
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for (foo=0; foo<area; foo++) {
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if (ptrplane[foo] > maxval) maxval = ptrplane[foo];
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}
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return maxval;
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}
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/* ---------------------------------------------------------------- */
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float fimg_get_maxvalue(FloatImg *head)
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{
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float maxval;
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int foo, surface;
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if (head->type != FIMG_TYPE_RGB && head->type != FIMG_TYPE_GRAY) {
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fprintf(stderr, "%s : type %d invalide\n",
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__func__, head->type);
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return nanf("wtf ?");
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}
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maxval = 0.0; /* no negative values allowed */
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surface = head->width*head->height;
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switch (head->type) {
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case FIMG_TYPE_RGB:
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for (foo=0; foo<surface; foo++) {
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if (head->R[foo] > maxval) maxval = head->R[foo];
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if (head->G[foo] > maxval) maxval = head->G[foo];
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if (head->B[foo] > maxval) maxval = head->B[foo];
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}
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break;
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case FIMG_TYPE_GRAY:
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for (foo=0; foo<surface; foo++) {
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if (head->R[foo] > maxval) maxval = head->R[foo];
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}
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break;
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}
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return maxval;
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}
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/* ---------------------------------------------------------------- */
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/*
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* mmval[0] <- min(R) mmval[1] <- max(R)
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*/
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int fimg_get_minmax_rgb(FloatImg *head, float mmvals[6])
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{
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int idx, surface;
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float fval;
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if (head->type != FIMG_TYPE_RGB) {
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fprintf(stderr, "%s : type %d invalide\n",
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__func__, head->type);
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return -2;
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}
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surface = head->width * head->height;
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mmvals[0] = FLT_MAX; mmvals[1] = -FLT_MAX;
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mmvals[2] = FLT_MAX; mmvals[3] = -FLT_MAX;
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mmvals[4] = FLT_MAX; mmvals[5] = -FLT_MAX;
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for (idx=0; idx<surface; idx++) {
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fval = head->R[idx];
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if (fval < mmvals[0]) mmvals[0] = fval;
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else if (fval > mmvals[1]) mmvals[1] = fval;
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fval = head->G[idx];
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if (fval < mmvals[2]) mmvals[2] = fval;
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else if (fval > mmvals[3]) mmvals[3] = fval;
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fval = head->B[idx];
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if (fval < mmvals[4]) mmvals[4] = fval;
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else if (fval > mmvals[5]) mmvals[5] = fval;
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}
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return -0;
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}
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/* ---------------------------------------------------------------- */
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int fimg_meanvalues(FloatImg *head, float means[4])
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{
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int idx, surface;
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double accus[4];
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surface = head->width * head->height;
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if (surface < 1) return -1;
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memset(accus, 0, 4*sizeof(double));
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for (idx=0; idx<surface; idx++) {
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accus[0] += (double)head->R[idx];
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if (head->type > 2) { /* WTF ? */
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accus[1] += (double)head->G[idx];
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accus[2] += (double)head->B[idx];
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}
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}
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for (idx=0; idx<4; idx++) {
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means[idx] = (float)(accus[idx]/(double)surface);
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}
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return 0;
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}
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/* ---------------------------------------------------------------- */
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/* d'apres Wikipedia Fr :
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| c = 0
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| s = x1
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| pour j de 2 à n
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| s = s+xj
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| c = c+(j xj − s)2/(j(j−1))
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| renvoyer c/n
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Mais c,a ne semble pas etre la bonne methode. Il faut aller voir :
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https://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
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*/
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/* ---------------------------------------------------------------- */
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/*
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* more elaborate functions are in fimg-2gray.c
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*/
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int fimg_to_gray(FloatImg *head)
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{
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float add;
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int foo;
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if (head->type != FIMG_TYPE_RGB) {
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fprintf(stderr, "%s : type %d invalide\n",
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__func__, head->type);
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return -3;
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}
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for (foo=0; foo<(head->width*head->height); foo++) {
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add = head->R[foo];
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add += head->G[foo];
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add += head->B[foo];
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head->R[foo] = head->G[foo] = head->B[foo] = add / 3.0;
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}
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return 0;
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}
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/* ---------------------------------------------------------------- */
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int fimg_add_cste(FloatImg *fi, float value)
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{
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int nbre, idx;
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if (fi->type != FIMG_TYPE_RGB) {
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fprintf(stderr, "%s : type %d invalide\n",
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__func__, fi->type);
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return -44;
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}
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nbre = fi->width * fi->height ;
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#if DEBUG_LEVEL
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fprintf(stderr, "%s, nbre is %d\n", __func__, nbre);
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#endif
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for (idx=0; idx<nbre; idx++) {
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fi->R[idx] += value;
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fi->G[idx] += value;
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fi->B[idx] += value;
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}
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return 0;
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}
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/* ---------------------------------------------------------------- */
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long fimg_count_negativ(FloatImg *fi)
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{
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int nbre, idx;
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long count;
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if (fi->type != FIMG_TYPE_RGB) {
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fprintf(stderr, "%s : type %d invalide\n",
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__func__, fi->type);
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return -1;
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}
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nbre = fi->width * fi->height;
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count = 0;
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for (idx=0; idx<nbre; idx++) {
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if (fi->R[idx] < 0.0) count++;
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if (fi->G[idx] < 0.0) count++;
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if (fi->B[idx] < 0.0) count++;
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}
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return count;
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}
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/* ---------------------------------------------------------------- */
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/* nouveau 29 fevrier 2020 */
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long fimg_clamp_negativ(FloatImg *fi)
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{
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int nbre, idx;
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long count;
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if (fi->type != FIMG_TYPE_RGB) {
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fprintf(stderr, "%s : type %d invalide\n",
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__func__, fi->type);
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return -1;
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}
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nbre = fi->width * fi->height;
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count = 0;
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for (idx=0; idx<nbre; idx++) {
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if (fi->R[idx] < 0.0) {
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fi->R[idx] = 0.0; count++;
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}
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if (fi->G[idx] < 0.0) {
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fi->G[idx] = 0.0; count++;
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}
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if (fi->B[idx] < 0.0) {
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fi->B[idx] = 0.0; count++;
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}
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}
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/* WTF 12 avril 2020, valgrind me cause mal ?
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==28943== Conditional jump or move depends on uninitialised value(s)
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==28943== at 0x4045E9: fimg_clamp_negativ (fimg-math.c:208)
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==28943== by 0x4018C9: essai_filtrage_3x3 (t.c:128)
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==28943== by 0x4024D5: main (t.c:444)
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==28943== Uninitialised value was created by a heap allocation
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==28943== at 0x483577F: malloc (vg_replace_malloc.c:299)
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==28943== by 0x40284D: fimg_create (fimg-core.c:107)
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==28943== by 0x402AB3: fimg_clone (fimg-core.c:174)
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==28943== by 0x401861: essai_filtrage_3x3 (t.c:118)
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==28943== by 0x4024D5: main (t.c:444)
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*/
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return count;
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}
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/* ---------------------------------------------------------------- */
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int fimg_mul_cste(FloatImg *fi, float value)
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{
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int nbre, idx;
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if ( (fi->type != FIMG_TYPE_RGB) && (fi->type != FIMG_TYPE_GRAY) ) {
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fprintf(stderr, "%s : type %d invalide\n",
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__func__, fi->type);
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return -44;
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}
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nbre = fi->width * fi->height;
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#if DEBUG_LEVEL
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fprintf(stderr, "%s, nbre of datum is %d\n", __func__, nbre);
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#endif
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if (fi->type == FIMG_TYPE_RGB) {
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for (idx=0; idx<nbre; idx++) {
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fi->R[idx] *= value;
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fi->G[idx] *= value;
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fi->B[idx] *= value;
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}
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}
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if (fi->type == FIMG_TYPE_GRAY) {
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for (idx=0; idx<nbre; idx++) {
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fi->R[idx] *= value;
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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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/* nouveau 17 septembre 2022 */
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int fimg_div_cste(FloatImg *fi, float value)
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{
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int nbre, idx;
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if ( (fi->type != FIMG_TYPE_RGB) && (fi->type != FIMG_TYPE_GRAY) ) {
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fprintf(stderr, "%s : type %d invalide\n",
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__func__, fi->type);
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return -44;
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}
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nbre = fi->width * fi->height;
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if (fi->type == FIMG_TYPE_RGB) {
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for (idx=0; idx<nbre; idx++) {
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fi->R[idx] /= value;
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fi->G[idx] /= value;
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fi->B[idx] /= value;
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}
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}
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if (fi->type == FIMG_TYPE_GRAY) {
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for (idx=0; idx<nbre; idx++) {
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fi->R[idx] /= value;
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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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* oh, please explain the usecase of this function !
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*/
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int fimg_ajust_from_grab(FloatImg *fi, double maxima, int notused)
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{
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double coef;
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if (notused) {
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fprintf(stderr, "notused was %d, must be 0 in %s\n",
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notused, __func__);
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}
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if (fi->type != FIMG_TYPE_RGB) {
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fprintf(stderr, "%s : type %d invalide\n",
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__func__, fi->type);
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return -99;
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}
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if (fi->count < 1) {
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fprintf(stderr, "%s : count %d is invalid\n", __func__, fi->count);
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return -98;
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}
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/*
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* mmmm, is this real ?
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* how to accuratly check the value of 'I.fval' ?
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*/
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coef = 1.0 / ((double)fi->count * (double)fi->fval);
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if (verbosity) {
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fprintf(stderr, "image @ %p\n", fi);
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fprintf(stderr, "fval %f\n", fi->fval);
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fprintf(stderr, "count %d\n", fi->count);
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fprintf(stderr, "maxima %f\n", maxima);
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fprintf(stderr, "coef %f\n", coef);
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}
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fimg_mul_cste(fi, coef);
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return 0;
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}
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/* ---------------------------------------------------------------- */
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int fimg_absolute(FloatImg *fi)
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{
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int surface, idx;
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surface = fi->width * fi->height;
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for (idx=0; idx<surface; idx++) {
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fi->R[idx] = fabsf(fi->R[idx]);
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fi->G[idx] = fabsf(fi->G[idx]);
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fi->B[idx] = fabsf(fi->B[idx]);
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}
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return 0;
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}
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/* ---------------------------------------------------------------- */
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/* Warning: this function is _very_ slow */
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void fimg_drand48(FloatImg *fi, float kmul)
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{
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int nbre, idx;
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#if DEBUG_LEVEL
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fprintf(stderr, ">>> %s ( %p %g )\n", __func__, fi, kmul);
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#endif
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if (fi->type != FIMG_TYPE_RGB) {
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fprintf(stderr, "%s : type %d invalide\n",
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__func__, fi->type);
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return;
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}
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nbre = fi->width * fi->height;
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// fprintf(stderr, "%s: %d pixels\n", __func__, nbre);
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for (idx=0; idx<nbre; idx++) {
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fi->R[idx] = drand48() * kmul;
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fi->G[idx] = drand48() * kmul;
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fi->B[idx] = drand48() * kmul;
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}
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}
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/* ---------------------------------------------------------------- */
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