/*
 *		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;

/* -------------------------------------------------------------- */
/* nouveau du 20 novembre 2020, pour encoder une vidz du vernissage
 * du festival Sauvageonnes de Mixart-Myrys					 */
int des_bords_sombres_a(FloatImg *pimg, int offset)
{
float		coef;
int		xpos, xp2, lidx, y;

#if DEBUG_LEVEL
fprintf(stderr, ">>> %s ( %p %d )\n", __func__, pimg, offset);
#endif

if (offset<0 || offset>=pimg->width) {
	fprintf(stderr, "%s offset %d is bad\n", __func__, offset);
	return -66;
	}

for (y=0; y<pimg->height; y++) {
	lidx = y * pimg->width;			/* start of the
						   'y' line */
	for (xpos=0; xpos<offset; xpos++) {
		coef = (float)xpos / (float)offset;
		pimg->R[xpos+lidx] *= coef;
		pimg->G[xpos+lidx] *= coef;
		pimg->B[xpos+lidx] *= coef;
		xp2 = pimg->width-xpos;
		pimg->R[xp2+lidx] *= coef;
		pimg->G[xp2+lidx] *= coef;
		pimg->B[xp2+lidx] *= coef;
		}
	}

return 0;
}
/* -------------------------------------------------------------- */
int trinarize(FloatImg *pimg, int notused)
{
float		mm[6], mRa, mGa, mBa, mRb, mGb, mBb;
float		val, *fptr;
int		foo, size;

#if DEBUG_LEVEL
fprintf(stderr, ">>> %s ( %p %d )\n", __func__, pimg, notused);
#endif

foo = fimg_get_minmax_rgb(pimg, mm);
mRa = (mm[1] - mm[0]) * 0.33333;
mGa = (mm[3] - mm[2]) * 0.33333;
mBa = (mm[5] - mm[4]) * 0.33333;
mRb = (mm[1] - mm[0]) * 0.66666;
mGb = (mm[3] - mm[2]) * 0.66666;
mBb = (mm[5] - mm[4]) * 0.66666;

size = pimg->width * pimg->height;

#define VAL	(255.0)

for (foo=0; foo<size; foo++) {

	fptr = pimg->R;
	if (fptr[foo] < mRa || fptr[foo] > mRb)
		fptr[foo] = 0.0;
	else
		fptr[foo] = mm[1];

	fptr = pimg->G;
	if (fptr[foo] < mGa || fptr[foo] > mGb)
		fptr[foo] = 0.0;
	else
		fptr[foo] = mm[3];

	fptr = pimg->B;
	if (fptr[foo] < mBa || fptr[foo] > mBb)
		fptr[foo] = 0.0;
	else
		fptr[foo] = mm[5];

	}

return 0;
}
/* -------------------------------------------------------------- */
int binarize(FloatImg *pimg, int notused)
{
float		mm[6], mR, mG, mB;
int		foo, size;

#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);

size = pimg->width * pimg->height;

for (foo=0; foo<size; foo++) {
	if (pimg->R[foo] < mR)	pimg->R[foo] = mm[0];
	else			pimg->R[foo] = mm[1];
	if (pimg->G[foo] < mG)	pimg->G[foo] = mm[2];
	else			pimg->G[foo] = mm[3];
	if (pimg->B[foo] < mB)	pimg->B[foo] = mm[4];
	else			pimg->B[foo] = mm[5];
	}

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