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