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45 lines
1.8 KiB
45 lines
1.8 KiB
/* magstep.h: declaration for magstep fixing. |
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Copyright (C) 1994 Karl Berry. |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2, or (at your option) |
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any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
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#ifndef KPATHSEA_MAGSTEP_H |
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#define KPATHSEA_MAGSTEP_H |
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#include <kpathsea/c-proto.h> |
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#include <kpathsea/types.h> |
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/* If DPI is close enough to some magstep of BDPI, return the true dpi |
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value, and the magstep found (or zero) in M_RET (if |
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non-null). ``Close enough'' means within one pixel. |
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M_RET is slightly encoded: the least significant bit is on for a |
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half-magstep, off otherwise. Thus, a returned M_RET of 1 means |
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\magstephalf, i.e., sqrt(1.2), i.e., 1.09544. Put another way, |
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return twice the number of magsteps. |
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In practice, this matters for magstephalf. Floating-point computation |
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with the fixed-point DVI representation leads to 328 (for BDPI == |
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300); specifying `at 11pt' yields 330; the true \magstephalf is 329 |
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(that's what you get if you run Metafont with mag:=magstep(.5)). |
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The time to call this is after you read the font spec from the DVI |
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file, but before you look up any files -- do the usual floating-point |
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computations, and then fix up the result. */ |
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extern unsigned kpse_magstep_fix P3H(unsigned dpi, unsigned bdpi, int *m_ret); |
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#endif /* not KPATHSEA_MAGSTEP_H */
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