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- /*
- * This file is part of the UCB release of Plan 9. It is subject to the license
- * terms in the LICENSE file found in the top-level directory of this
- * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
- * part of the UCB release of Plan 9, including this file, may be copied,
- * modified, propagated, or distributed except according to the terms contained
- * in the LICENSE file.
- */
- #include <u.h>
- #include <libc.h>
- #include <draw.h>
- static
- int
- unitsperline(Rectangle r, int d, int bitsperunit)
- {
- uint32_t l, t;
- if(d <= 0 || d > 32) /* being called wrong. d is image depth. */
- abort();
- if(r.min.x >= 0){
- l = (r.max.x*d+bitsperunit-1)/bitsperunit;
- l -= (r.min.x*d)/bitsperunit;
- }else{ /* make positive before divide */
- t = (-r.min.x*d+bitsperunit-1)/bitsperunit;
- l = t+(r.max.x*d+bitsperunit-1)/bitsperunit;
- }
- return l;
- }
- int
- wordsperline(Rectangle r, int d)
- {
- return unitsperline(r, d, 8*sizeof(uint32_t));
- }
- int
- bytesperline(Rectangle r, int d)
- {
- return unitsperline(r, d, 8);
- }
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