shithub: qk1

ref: a71e36307ff986c2aef20afb1507de1d74d4508a
dir: /span.c/

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#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);
}