tcloadimage.c - plan9port - [fork] Plan 9 from user space
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       ---
       tcloadimage.c (933B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include <draw.h>
            4 
            5 int
            6 cloadimage(Image *i, Rectangle r, uchar *data, int ndata)
            7 {
            8         int m, nb, miny, maxy, ncblock;
            9         uchar *a;
           10 
           11         if(!rectinrect(r, i->r)){
           12                 werrstr("cloadimage: bad rectangle");
           13                 return -1;
           14         }
           15 
           16         miny = r.min.y;
           17         m = 0;
           18         ncblock = _compblocksize(r, i->depth);
           19         while(miny != r.max.y){
           20                 maxy = atoi((char*)data+0*12);
           21                 nb = atoi((char*)data+1*12);
           22                 if(maxy<=miny || r.max.y<maxy){
           23                         werrstr("creadimage: bad maxy %d", maxy);
           24                         return -1;
           25                 }
           26                 data += 2*12;
           27                 ndata -= 2*12;
           28                 m += 2*12;
           29                 if(nb<=0 || ncblock<nb || nb>ndata){
           30                         werrstr("creadimage: bad count %d", nb);
           31                         return -1;
           32                 }
           33                 a = bufimage(i->display, 21+nb);
           34                 if(a == nil)
           35                         return -1;
           36                 a[0] = 'Y';
           37                 BPLONG(a+1, i->id);
           38                 BPLONG(a+5, r.min.x);
           39                 BPLONG(a+9, miny);
           40                 BPLONG(a+13, r.max.x);
           41                 BPLONG(a+17, maxy);
           42                 memmove(a+21, data, nb);
           43                 miny = maxy;
           44                 data += nb;
           45                 ndata += nb;
           46                 m += nb;
           47         }
           48         return m;
           49 }