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#include <stdio.h>
long *bm;
long h, w;
long factor;
#define OC(x,xi) ((x)*factor+(xi))
#define BM(x,xi,y,yi) bm[OC(y,yi)*w+OC(x,xi)]
#define COMP(r,g,b) ((r) | ((g)<<8) | ((b) << 16))
#define R(comp) ((comp) & 0xff)
#define G(comp) (((comp)>>8) & 0xff)
#define B(comp) (((comp)>>16) & 0xff)
main(argc, argv)
char **argv;
{
char lbuf[100];
int nh, nw;
int x, y, xi, yi;
int num;
int r, g, b;
long data;
long *nbm, *nbmp;
int i;
int bits, mask, roundbit, addbit;
int pf;
int newfmt = 0;
if( argc != 2 && argc != 3) {
fprintf(stderr, "Usage: squash factor [bits]\n");
exit(1);
}
factor = atoi(argv[1]);
if ( argc > 2 ) {
bits = atoi(argv[2]);
mask = (1 << bits) - 1;
mask <<= (8-bits);
roundbit = 1 << (7-bits);
addbit = 1 << (8-bits);
fprintf(stderr, "%x %x %x\n", mask, roundbit, addbit);
} else {
mask = 0xff;
roundbit = 0;
addbit = 0;
}
gets(lbuf);
if ( strncmp( lbuf, "CMIF", 4) == 0 ) {
newfmt = 1;
gets(lbuf);
if( sscanf(lbuf, "(%d,%d,%d)", &w, &h, &pf) != 3) {
fprintf(stderr, "%s: bad size spec: %s\n", argv[0], lbuf);
exit(1);
}
if ( pf != 0 ) {
fprintf(stderr, "%s: packed file\n", argv[0]);
exit(1);
}
} else {
if ( sscanf(lbuf, "(%d,%d)", &w, &h) != 2) {
fprintf(stderr, "%s: bad size spec: %s\n", argv[0], lbuf);
exit(1);
}
}
nh = h / factor;
nw = w / factor;
if ( newfmt )
printf("CMIF video 1.0\n(%d,%d,%d)\n", nw, nh, 0);
else
printf("(%d,%d)\n", nw, nh);
if ( (bm = (long *)malloc(h*w*sizeof(long))) == 0) {
fprintf(stderr, "%s: No memory\n", argv[0]);
exit(1);
}
if ( (nbm = (long *)malloc(nh*nw*sizeof(long))) == 0) {
fprintf(stderr, "%s: No memory\n", argv[0]);
exit(1);
}
while( !feof(stdin) ) {
{ int t, s;
gets(lbuf);
if ( feof(stdin) ) break;
if ( sscanf(lbuf, "%d,%d", &t,&s) == 2) {
if ( s != h*w*4 ) {
fprintf(stderr, "Size changed from %d to %d: %s\n",4*h*w,s, lbuf);
exit(1);
}
printf("%d, %d\n", t, nh*nw*4);
} else {
puts(lbuf);
}
}
fprintf(stderr, "Reading %d\n", h*w*sizeof(long));
if ( (i=fread(bm, 1, h*w*sizeof(long), stdin)) != h*w*sizeof(long)) {
fprintf(stderr, "%s: short read, %d wanted %d\n", argv[0],
i, h*w*sizeof(long));
exit(1);
}
nbmp = nbm;
for( y=0; y<nh; y++) {
for ( x=0; x<nw; x++) {
r = g = b = 0;
num = 0;
for( xi=0; xi<factor; xi++ ) {
for(yi=0; yi<factor; yi++) {
if ( y*factor+yi < h && x*factor+xi < w ) {
num++;
data = BM(x,xi,y,yi);
r += R(data);
g += G(data);
b += B(data);
}
else fprintf(stderr, "skip %d %d %d %d\n", x, xi, y, yi);
}
}
r = r/num; g = g/num; b = b/num;
if ( (r & mask) != mask && ( r & roundbit) ) r += addbit;
if ( (g & mask) != mask && ( g & roundbit) ) g += addbit;
if ( (b & mask) != mask && ( b & roundbit) ) b += addbit;
data = COMP(r, g, b);
*nbmp++ = data;
}
}
if (nbmp - nbm != nh * nw ) fprintf(stderr, "%d %d\n", nbmp-nbm, nh*nw);
fprintf(stderr, "Writing %d\n", (nbmp-nbm)*sizeof(long));
fwrite(nbm, 1, (nbmp-nbm)*sizeof(long), stdout);
}
exit(0);
}
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