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FIXPOS.H
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1988-05-30
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/* -*-C-*- fixpos.h */
/*-->fixpos*/
/**********************************************************************/
/******************************* fixpos *******************************/
/**********************************************************************/
COORDINATE
fixpos(cc,c,cnvfac)
register COORDINATE cc; /* coordinates in device pixels */
register INT32 c; /* coordinates in DVI units */
register float cnvfac; /* converts DVI units to pixels */
{
register COORDINATE ccc;
/*
A sequence of consecutive rules, or consecutive characters in a
fixed-width font whose width is not an integer number of pixels, can
cause |cc| to drift far away from a correctly rounded value. We
follow DVITYPE Version 2.6 to ensure that the amount of drift will
never exceed MAXDRIFT pixels. DVITYPE Version 2.0 did not do this,
and the results could be visibly AWFUL!!
*/
ccc = PIXROUND(c,cnvfac);
if (ABS(ccc-cc) > MAXDRIFT)
{ /* drag cc toward the correctly rounded value ccc */
if (ccc > cc)
{
cc = ccc - MAXDRIFT;
}
else
{
cc = ccc + MAXDRIFT;
}
}
return (cc);
}