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/*
* dpicheck of dvips.c. Checks the dots per inch to make sure
* it exists. The fonts which exist are DPI at the appropriate
* magnifications.
*/
#include "dvips.h" /* The copyright notice in that file is included too! */
/*
* The external declarations:
*/
#include "protos.h"
static integer existsizes[30] = { 0 , 99999999 };
static int checkdpi;
/*
* This routine adds some sizes to `existsizes'.
*/
static void
addsiz(int rhsize)
{
register integer *p;
long t, hsize;
hsize = rhsize;
for (p=existsizes; *p < hsize; p++);
if (*p == hsize)
return;
do {
t = *p;
*p++ = hsize;
hsize = t;
} while (hsize);
}
static void
adddpi(int hsize)
{
long a, b, c;
int i;
addsiz(hsize);
addsiz((int)((hsize * 116161L + 53020L) / 106040L));
a = hsize;
b = 0;
c = 1;
for (i=0; i<9; i++) {
b = 6 * b + (a % 5) * c;
a = a + a / 5;
c = c * 5;
if (b > c) {
b -= c;
a++;
}
if (b + b >= c)
addsiz((int)(a+1));
else
addsiz((int)a);
}
}
/*
* Finally, the routine that checks a size for match.
*/
halfword
dpicheck(halfword dpi)
{
integer i;
integer margin = 1 + dpi / 500;
if (! checkdpi) {
adddpi(DPI);
checkdpi = 1;
}
for (i=0; existsizes[i] < dpi; i++);
if (existsizes[i]-dpi <= margin)
return(existsizes[i]);
else if (dpi-existsizes[i-1] <= margin)
return(existsizes[i-1]);
else
return(dpi);
}
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