57 lines
1.1 KiB
C
57 lines
1.1 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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loadimage(Image *i, Rectangle r, uchar *data, int ndata)
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{
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long dx, dy;
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int n, bpl;
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uchar *a;
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int chunk;
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chunk = i->display->bufsize - 64;
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if(!rectinrect(r, i->r)){
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werrstr("loadimage: 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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n = bpl*Dy(r);
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if(n > ndata){
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werrstr("loadimage: insufficient data");
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return -1;
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}
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ndata = 0;
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while(r.max.y > r.min.y){
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dy = Dy(r);
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dx = Dx(r);
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if(dy*bpl > chunk)
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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(loadimage(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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n = dy*bpl;
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a = bufimage(i->display, 21+n);
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if(a == nil){
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werrstr("loadimage: %r");
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return -1;
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}
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a[0] = 'y';
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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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memmove(a+21, data, n);
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ndata += dy*bpl;
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data += dy*bpl;
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r.min.y += dy;
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}
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return ndata;
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}
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