libtthimage/Lib/extractbits.c

61 lines
1.4 KiB
C
Raw Normal View History

2022-06-27 08:53:59 +02:00
/*
* extractbits.c
* new 11 mars 2014
*/
#include <stdio.h>
#include "../tthimage.h"
/*::------------------------------------------------------------------::*/
int Image_extrbits_0(Image_Desc *src, Image_Desc *dst, int rs, int gs, int bs)
{
int x, y, foo;
int mr, mg, mb, r, g, b;
#if DEBUG_LEVEL
fprintf(stderr, "%s ( %p %p %d %d %d )\n", __func__, src, dst, rs, gs, bs);
#endif
if ( rs<0 || gs<0 || bs<0 ) {
fprintf(stderr, "%s : no negativ shift\n", __func__);
return BAD_PARAMETER;
}
if ( rs>8 || gs>8 || bs>8 ) {
fprintf(stderr, "%s : no shift > 7\n", __func__);
return BAD_PARAMETER;
}
if ( (foo=Image_compare_desc(src, dst)) ) {
fprintf(stderr, "%s: images are differents %d\n", __func__, foo);
return foo;
}
mr = 1 << rs;
mg = 1 << gs;
mb = 1 << bs;
#if DEBUG_LEVEL
fprintf(stderr, "%s masques = 0x%02x 0X%02x 0x%02x\n", __func__, mr, mg, mb);
#endif
for (y=0; y<dst->height; y++)
{
for (x=0; x<dst->width; x++)
{
r = ((src->Rpix[y])[x] & mr) ? 255 : 0;
dst->Rpix[y][x] = r;
g = ((src->Gpix[y])[x] & mg) ? 255 : 0;
dst->Gpix[y][x] = g;
b = ((src->Bpix[y])[x] & mb) ? 255 : 0;
dst->Bpix[y][x] = b;
}
}
return FUNC_IS_BETA;
}
/*::------------------------------------------------------------------::*/
/*::------------------------------------------------------------------::*/
/*::------------------------------------------------------------------::*/