FloatImg/Fonderie/sfx.c

/*
 *		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;
}
/* -------------------------------------------------------------- */