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#include <u.h>
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#include <libc.h>
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#include <draw.h>
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static
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int
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unitsperline(Rectangle r, int d, int bitsperunit)
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{
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	ulong l, t;
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	if(d <= 0 || d > 32)	/* being called wrong.  d is image depth. */
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		abort();
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	if(r.min.x >= 0){
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		l = (r.max.x*d+bitsperunit-1)/bitsperunit;
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		l -= (r.min.x*d)/bitsperunit;
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	}else{			/* make positive before divide */
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		t = (-r.min.x*d+bitsperunit-1)/bitsperunit;
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		l = t+(r.max.x*d+bitsperunit-1)/bitsperunit;
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	}
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	return l;
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}
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int
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wordsperline(Rectangle r, int d)
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{
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	return unitsperline(r, d, 8*sizeof(ulong));
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}
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int
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bytesperline(Rectangle r, int d)
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{
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	return unitsperline(r, d, 8);
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}