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Annotation of researchv10dc/630/man/src/p_man/man3/addr.3r, revision 1.1.1.1

1.1       root        1: .TH ADDR 3R "630 MTG"
                      2: .XE "addr()"
                      3: .SH NAME
                      4: addr \- return the Word address of a Point in a Bitmap
                      5: .SH SYNOPSIS
                      6: \f3#include <dmd.h>\f1
                      7: .sp
                      8: \f3Word \(**addr (b, p)\f1
                      9: .br
                     10: .B Bitmap \(**b;
                     11: .br
                     12: .B Point p;\fR
                     13: .SH DESCRIPTION
                     14: The
                     15: .I addr 
                     16: function
                     17: returns the address of the Word containing the bit
                     18: corresponding to the Point
                     19: .I p
                     20: in the Bitmap
                     21: .I b.
                     22: .SH EXAMPLE
                     23: The following subroutine can be used to determine whether a Point
                     24: .I p
                     25: in a Bitmap
                     26: .I b
                     27: is on or off (returning 1 or 0, respectively).
                     28: .PP
                     29: .RS 3
                     30: .nf
                     31: .ft CM
                     32: #include <dmd.h>
                     33: Word *addr();
                     34: 
                     35: pixel (b, p)
                     36: Bitmap *b;
                     37: Point  p;
                     38: {
                     39:        Word *w;
                     40:        UWord bit;
                     41: 
                     42:        w = addr (b, p);
                     43:        bit = FIRSTBIT >> (p.x%WORDSIZE);
                     44:        return (*w&bit)==bit;
                     45: }
                     46: .fi
                     47: .ft R
                     48: .RE
                     49: .PP
                     50: This routine is implemented differently in \f2rol\f1(3L).
                     51: .SH SEE ALSO
                     52: rol(3L), structure(3R).

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