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/* magstep.h: declaration for magstep fixing.
Copyright 1994, 2008, 2009 Karl Berry.
Copyright 1999, 2005 Olaf Weber.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library; if not, see <http://www.gnu.org/licenses/>. */
#ifndef KPATHSEA_MAGSTEP_H
#define KPATHSEA_MAGSTEP_H
#include <kpathsea/c-proto.h>
#include <kpathsea/types.h>
/* If DPI is close enough to some magstep of BDPI, return the true dpi
value, and the magstep found (or zero) in M_RET (if
non-null). ``Close enough'' means within one pixel.
M_RET is slightly encoded: the least significant bit is on for a
half-magstep, off otherwise. Thus, a returned M_RET of 1 means
\magstephalf, i.e., sqrt(1.2), i.e., 1.09544. Put another way,
return twice the number of magsteps.
In practice, this matters for magstephalf. Floating-point computation
with the fixed-point DVI representation leads to 328 (for BDPI ==
300); specifying `at 11pt' yields 330; the true \magstephalf is 329
(that's what you get if you run Metafont with mag:=magstep(.5)).
The time to call this is after you read the font spec from the DVI
file, but before you look up any files -- do the usual floating-point
computations, and then fix up the result. */
extern KPSEDLL unsigned kpathsea_magstep_fix (kpathsea kpse, unsigned dpi,
unsigned bdpi, int *m_ret);
#if defined (KPSE_COMPAT_API)
extern KPSEDLL unsigned kpse_magstep_fix (unsigned dpi, unsigned bdpi,
int *m_ret);
#endif
#endif /* not KPATHSEA_MAGSTEP_H */
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