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1 #include <u.h>2 #include <libc.h>3 #include <draw.h>5 static6 int7 unitsperline(Rectangle r, int d, int bitsperunit)8 {9 ulong l, t;11 if(d <= 0 || d > 32) /* being called wrong. d is image depth. */12 abort();14 if(r.min.x >= 0){15 l = (r.max.x*d+bitsperunit-1)/bitsperunit;16 l -= (r.min.x*d)/bitsperunit;17 }else{ /* make positive before divide */18 t = (-r.min.x*d+bitsperunit-1)/bitsperunit;19 l = t+(r.max.x*d+bitsperunit-1)/bitsperunit;20 }21 return l;22 }24 int25 wordsperline(Rectangle r, int d)26 {27 return unitsperline(r, d, 8*sizeof(u32int));28 }30 int31 bytesperline(Rectangle r, int d)32 {33 return unitsperline(r, d, 8);34 }