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#include <u.h>
#include <libc.h>
#include <bio.h>
#include <draw.h>
#include <memdraw.h>
#include "imagefile.h"
static Memimage *memtochan(Memimage *, ulong);
void
usage(void)
{
fprint(2, "usage: %s [-c 'comment'] "
"[-3bgGhklLptvyY] [file]\n", argv0);
exits("usage");
}
void
main(int argc, char *argv[])
{
Biobuf bout;
Memimage *i, *ni;
int fd, chanflag, comp, opt;
char *err, *file, *c;
ulong chan;
chan = BGR24;
chanflag = opt = 0;
comp = 1;
c = nil;
ARGBEGIN {
case '3': /* force RGB */
chan = BGR24;
chanflag = 1;
break;
case 'b':
chan = GREY1;
chanflag = 1;
break;
case 'c':
c = EARGF(usage());
break;
case 'g': /* t4 */
comp = 3;
opt = 0;
break;
case 'G': /* t4 two-dimensional */
comp = 3;
opt = 1;
break;
case 'h': /* huffman */
comp = 2;
break;
case 'k':
chan = GREY8;
chanflag = 1;
break;
case 'l': /* lzw */
comp = 5;
opt = 0;
break;
case 'L': /* lzw, horizontal differencing */
comp = 5;
opt = 1;
break;
case 'p': /* packbits */
comp = 0x8005;
break;
case 't': /* t6 */
comp = 4;
break;
case 'v': /* RGBV */
chan = CMAP8;
chanflag = 1;
break;
case 'y':
chan = GREY2;
chanflag = 1;
break;
case 'Y':
chan = GREY4;
chanflag = 1;
break;
default:
usage();
} ARGEND
if(argc > 1)
usage();
if(argc == 0) {
file = "<stdin>";
fd = 0;
} else {
file = argv[0];
if((fd = open(file, OREAD)) < 0)
sysfatal("open %s: %r", file);
}
if(Binit(&bout, 1, OWRITE) < 0)
sysfatal("Binit: %r");
memimageinit();
if((i = readmemimage(fd)) == nil)
sysfatal("readmemimage %s: %r", file);
close(fd);
if(comp >= 2 && comp <= 4) {
chan = GREY1;
chanflag = 1;
} else if(chan == GREY2) {
if((ni = memtochan(i, chan)) == nil)
sysfatal("memtochan: %r");
if(i != ni) {
freememimage(i);
i = ni;
}
chan = GREY4;
}
if(!chanflag) {
switch(i->chan) {
case GREY1:
case GREY4:
case GREY8:
case CMAP8:
case BGR24:
break;
case GREY2:
chan = GREY4;
chanflag = 1;
break;
default:
chanflag = 1;
break;
}
}
if(chanflag) {
if((ni = memtochan(i, chan)) == nil)
sysfatal("memtochan: %r");
if(i != ni) {
freememimage(i);
i = ni;
}
}
if((err = memwritetif(&bout, i, c, comp, opt)) != nil)
fprint(2, "%s: %s\n", argv0, err);
freememimage(i);
exits(err);
}
static Memimage *
memtochan(Memimage *i, ulong chan)
{
Memimage *ni;
if(i->chan == chan)
return i;
if((ni = allocmemimage(i->r, chan)) == nil)
return nil;
memimagedraw(ni, ni->r, i, i->r.min, nil, i->r.min, S);
return ni;
}
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