ref: bf02a0915ffa42a3b051ea6e41c9ed1528d04614
dir: /span.c/
#include <u.h>
#include <libc.h>
void
dospan(uchar *pdest, uchar *pbase, int s, int t, int sstep, int tstep, int spancount, int cachewidth)
{
#define P *pdest++ = pbase[(s >> 16) + (t >> 16) * cachewidth]; s += sstep; t += tstep
switch(spancount)
{
case 16: P; case 15: P; case 14: P; case 13: P; case 12: P; case 11: P; case 10: P; case 9: P;
case 8: P; case 7: P; case 6: P; case 5: P; case 4: P; case 3: P; case 2: P; case 1: P;
}
#undef P
USED(pdest, s, t);
}