libtthimage/Lib/dither4.c

92 lines
2.0 KiB
C

/*
dither4.c
---------
*/
#include <stdio.h>
#include <stdlib.h>
#include "../tthimage.h"
/*::------------------------------------------------------------------::*/
int
Image_dither_4x4_0(Image_Desc *s, Image_Desc *d, int uh)
{
int x, y, r, g, b;
int foo, sr, sg, sb;
fprintf(stderr, "* Image_dither_4x4_0 (%s) is experimental\n", __FILE__);
fprintf(stderr, "* Image_dither_4x4_0 le parametre est %d\n", uh);
if ( (foo=Image_compare_desc(s, d)) )
{
fprintf(stderr, "dither 4x4 0: images are differents %d\n", foo);
return foo;
}
Image_clear(d, 0, 0, 0);
for (y=0; y<s->height; y++)
{
for (x=0; x<s->width; x++)
{
}
}
return FUNC_NOT_FINISH;
}
/*::------------------------------------------------------------------::*/
int
Image_dither_bayer8x8rnd(Image_Desc *s, Image_Desc *d, int shuff, int mono)
{
uint16_t matrice[16][16];
int foo, itmp, m, n;
int x, y, r, g, b, pix;
fprintf(stderr, "%s ( %p %p %d %d )\n", __func__, s, d, shuff, mono);
/* remplissage de la matrice */
fprintf(stderr, " init matrice\n");
for(foo=0; foo<256; foo++)
{
((uint16_t *)matrice)[foo] = foo;
}
/* brasssage de la matrice */
fprintf(stderr, " shuffle matrice %d\n", shuff);
for (foo=0; foo<shuff; foo++) /* magic number ? */
{
m = rand() & 0xff;
n = rand() & 0xff;
itmp = ((uint16_t *)matrice)[n];
((uint16_t *)matrice)[n] = ((uint16_t *)matrice)[m];
((uint16_t *)matrice)[m] = itmp;
}
for (y=0; y<s->height; y++)
{
for (x=0; x<s->width; x++)
{
r = s->Rpix[y][x];
g = s->Gpix[y][x];
b = s->Bpix[y][x];
if (mono)
{
pix = (r + g +b) / 3;
d->Rpix[y][x] = d->Gpix[y][x] = d->Bpix[y][x] = \
(pix > matrice[x%16][y%16]) * 255;
}
else
{
d->Rpix[y][x] = (r > matrice[x%16][y%16]) * 255;
d->Gpix[y][x] = (g > matrice[x%16][y%16]) * 255;
d->Bpix[y][x] = (b > matrice[x%16][y%16]) * 255;
}
}
}
fprintf(stderr, " done\n");
return FULL_NUCKED;
}
/*::------------------------------------------------------------------::*/