64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <lib9.h>
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#include <draw.h>
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int
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loadimage(Image *i, Rectangle r, uint8_t *data, int ndata)
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{
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int32_t dy;
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int n, bpl;
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uint8_t *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 = r.max.y - r.min.y;
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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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werrstr("loadimage: image too wide for buffer");
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return -1;
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}
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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("bufimage failed");
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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.max.x);
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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 += n;
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data += n;
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r.min.y += dy;
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}
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if(flushimage(i->display, 0) < 0)
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return -1;
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return ndata;
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}
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