Bibliothèque de traitements d'images en virgule flottante. http://la.buvette.org/photos/cumul/
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FloatImg/Fonderie/sfx.c

109 lines
2.4 KiB

/*
* SPECIAL EFFECTS
*
* Du code bien cracra / tTh / Tetalab
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <malloc.h>
#include <floatimg.h>
#include "fonctions.h"
/* -------------------------------------------------------------- */
/* here are global vars exported by the main module
*/
extern int verbosity;
/* -------------------------------------------------------------- */
int binarize(FloatImg *pimg, int notused)
{
float mm[6], mR, mG, mB;
int foo, x, y;
float rgb[3];
#if DEBUG_LEVEL
fprintf(stderr, ">>> %s ( %p %d )\n", __func__, pimg, notused);
#endif
foo = fimg_get_minmax_rgb(pimg, mm);
mR = (mm[1] - mm[0]) / 2.0;
mG = (mm[3] - mm[2]) / 2.0;
mB = (mm[5] - mm[4]) / 2.0;
if (verbosity > 1)
fprintf(stderr, "%s: %f %f %f\n", __func__, mR, mG, mB);
for (y=0; y<pimg->height; y++) {
for (x=0; x<pimg->width; x++) {
fimg_get_rgb(pimg, x, y, rgb);
if (rgb[0] < mR) rgb[0] = mm[0];
else rgb[0] = mm[1];
if (rgb[1] < mG) rgb[1] = mm[2];
else rgb[1] = mm[3];
if (rgb[2] < mB) rgb[2] = mm[4];
else rgb[2] = mm[5];
fimg_put_rgb(pimg, x, y, rgb);
}
}
return 0;
}
/* -------------------------------------------------------------- */
int brotche_rand48_a(FloatImg *fimg, float ratio, float mval)
{
int nbpix, todo, foo;
int x, y;
float fval;
nbpix = fimg->width * fimg->height;
todo = (int)((float)nbpix * ratio);
if (verbosity > 1) {
fprintf(stderr, "%s: ratio %f nbpix %d todo %d\n", __func__,
ratio, nbpix, todo);
}
for (foo=0; foo<todo; foo++)
{
fval = (float)drand48() * mval;
x = rand() % fimg->width;
y = rand() % fimg->height;
fimg_plot_rgb(fimg, x, y, fval, fval, fval);
}
return 0;
}
/* -------------------------------------------------------------- */
int brotche_rand48_b(FloatImg *fimg, float ratio, float mval)
{
int nbpix, todo, foo;
int x, y;
float fval;
nbpix = fimg->width * fimg->height;
todo = (int)((float)nbpix * ratio);
if (verbosity > 1) {
fprintf(stderr, "%s: ratio %f nbpix %d todo %d\n", __func__,
ratio, nbpix, todo);
}
for (foo=0; foo<todo; foo++)
{
fval = (float)drand48() * mval;
x = 1 + (rand() % (fimg->width-2));
y = rand() % fimg->height;
fimg_plot_rgb(fimg, x-1, y, fval, 0.0, 0.0);
fimg_plot_rgb(fimg, x , y, 0.0, 0.0, fval);
fimg_plot_rgb(fimg, x+1, y, 0.0, fval, 0.0);
}
return 0;
}
/* -------------------------------------------------------------- */