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#include <u.h>
#include <libc.h>
#include <draw.h>
#include <memdraw.h>
Memimage*
rot90(Memimage *m)
{
int line, bpp, x, y, dx, dy;
ulong chan;
uchar *s, *d;
Memimage *w;
bpp = (m->depth+7)/8;
chan = m->chan;
switch(chan){
case GREY1:
case GREY2:
case GREY4:
if((w = allocmemimage(m->r, GREY8)) == nil)
sysfatal("allocmemimage: %r");
memimagedraw(w, w->r, m, m->r.min, nil, ZP, S);
freememimage(m);
m = w;
break;
}
dx = Dx(m->r);
dy = Dy(m->r);
if((w = allocmemimage(Rect(m->r.min.x, m->r.min.y,
m->r.min.x+dy, m->r.min.y+dx), m->chan)) == nil)
sysfatal("allocmemimage: %r");
line = w->width*sizeof(ulong);
for(y=0; y<dy; y++){
s = byteaddr(m, addpt(m->r.min, Pt(0, y)));
d = byteaddr(w, addpt(w->r.min, Pt(dy-y-1, 0)));
for(x=0; x<dx; x++){
switch(bpp){
case 4:
d[3] = s[3];
case 3:
d[2] = s[2];
case 2:
d[1] = s[1];
case 1:
d[0] = s[0];
}
s += bpp;
d += line;
}
}
freememimage(m);
if(w->chan != chan){
if((m = allocmemimage(w->r, chan)) == nil)
sysfatal("allocmemimage: %r");
memimagedraw(m, m->r, w, w->r.min, nil, ZP, S);
freememimage(w);
w = m;
}
return w;
}
Memimage*
upsidedown(Memimage *m)
{
uchar *s, *d, *t;
int w, y, dy;
dy = Dy(m->r);
w = m->width * sizeof(ulong);
if((t = malloc(w)) == nil)
sysfatal("malloc: %r");
for(y=0; y<dy/2; y++){
s = byteaddr(m, addpt(m->r.min, Pt(0, y)));
d = byteaddr(m, addpt(m->r.min, Pt(0, dy-y-1)));
memmove(t, d, w);
memmove(d, s, w);
memmove(s, t, w);
}
free(t);
return m;
}
void
usage(void)
{
fprint(2, "usage: %s [ -r degree ] [ -u | -l ] [ file ]\n", argv0);
exits("usage");
}
void
main(int argc, char *argv[])
{
Memimage *m;
int fd, r;
char f;
f = 0;
r = 0;
fd = 0;
ARGBEGIN {
case 'u':
f = 'u';
break;
case 'l':
f = 'l';
break;
case 'r':
r = atoi(EARGF(usage()));
break;
default:
usage();
} ARGEND;
if(*argv){
fd = open(*argv, OREAD);
if(fd < 0)
sysfatal("open: %r");
}
memimageinit();
if((m = readmemimage(fd)) == nil)
sysfatal("readmemimage: %r");
if(f == 'u' || f == 'l'){
m = upsidedown(m);
if(f == 'l')
r = 180;
}
switch(r % 360){
case 270:
m = rot90(m);
case 180:
m = rot90(m);
case 90:
m = rot90(m);
break;
}
if(writememimage(1, m) < 0)
sysfatal("writememimage: %r");
exits(0);
}
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