tunload.c - plan9port - [fork] Plan 9 from user space
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       ---
       tunload.c (437B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include <draw.h>
            4 #include <memdraw.h>
            5 
            6 int
            7 _unloadmemimage(Memimage *i, Rectangle r, uchar *data, int ndata)
            8 {
            9         int y, l;
           10         uchar *q;
           11 
           12         if(!rectinrect(r, i->r))
           13                 return -1;
           14         l = bytesperline(r, i->depth);
           15         if(ndata < l*Dy(r))
           16                 return -1;
           17         ndata = l*Dy(r);
           18         q = byteaddr(i, r.min);
           19         for(y=r.min.y; y<r.max.y; y++){
           20                 memmove(data, q, l);
           21                 q += i->width*sizeof(u32int);
           22                 data += l;
           23         }
           24         return ndata;
           25 }