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#include <u.h>
#include <libc.h>
#include <draw.h>
int
unloadimage(Image *i, Rectangle r, uchar *data, int ndata)
{
int bpl, n, chunk, dx, dy;
uchar *a, *start;
Display *d;
if(!rectinrect(r, i->r)){
werrstr("unloadimage: bad rectangle");
return -1;
}
bpl = bytesperline(r, i->depth);
if(ndata < bpl*Dy(r)){
werrstr("unloadimage: buffer too small");
return -1;
}
start = data;
d = i->display;
chunk = d->bufsize;
flushimage(d, 0); /* make sure subsequent flush is for us only */
while(r.min.y < r.max.y){
dx = Dx(r);
dy = chunk/bpl;
if(dy <= 0){
dy = 1;
dx = ((chunk*dx)/bpl) & ~7;
n = bytesperline(Rect(r.min.x, r.min.y, r.min.x+dx, r.min.y+dy), i->depth);
if(unloadimage(i, Rect(r.min.x+dx, r.min.y, r.max.x, r.min.y+dy), data+n, bpl-n) < 0)
return -1;
} else {
if(dy > Dy(r))
dy = Dy(r);
n = bpl*dy;
}
a = bufimage(d, 1+4+4*4);
if(a == 0){
werrstr("unloadimage: %r");
return -1;
}
a[0] = 'r';
BPLONG(a+1, i->id);
BPLONG(a+5, r.min.x);
BPLONG(a+9, r.min.y);
BPLONG(a+13, r.min.x+dx);
BPLONG(a+17, r.min.y+dy);
if(flushimage(d, 0) < 0)
return -1;
if(read(d->fd, data, n) < 0)
return -1;
data += bpl*dy;
r.min.y += dy;
}
return data - start;
}
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