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annotate kpathsea/magstep.h @ 1315:611d403c7f3d

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[project @ 1995-06-25 19:56:32 by jwe]
author jwe
date Sun, 25 Jun 1995 19:56:32 +0000
parents 69501f98669d
children
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1 /* magstep.h: declaration for magstep fixing.
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2
69501f98669d [project @ 1995-04-20 19:10:05 by jwe]
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3 Copyright (C) 1994 Karl Berry.
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4
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5 This program is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
69501f98669d [project @ 1995-04-20 19:10:05 by jwe]
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7 the Free Software Foundation; either version 2, or (at your option)
69501f98669d [project @ 1995-04-20 19:10:05 by jwe]
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8 any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software
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17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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18
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19 #ifndef KPATHSEA_MAGSTEP_H
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20 #define KPATHSEA_MAGSTEP_H
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21
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22 #include <kpathsea/c-proto.h>
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23 #include <kpathsea/types.h>
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24
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25 /* If DPI is close enough to some magstep of BDPI, return the true dpi
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26 value, and the magstep found (or zero) in M_RET (if
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27 non-null). ``Close enough'' means within one pixel.
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28
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29 M_RET is slightly encoded: the least significant bit is on for a
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30 half-magstep, off otherwise. Thus, a returned M_RET of 1 means
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31 \magstephalf, i.e., sqrt(1.2), i.e., 1.09544. Put another way,
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32 return twice the number of magsteps.
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33
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34 In practice, this matters for magstephalf. Floating-point computation
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35 with the fixed-point DVI representation leads to 328 (for BDPI ==
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36 300); specifying `at 11pt' yields 330; the true \magstephalf is 329
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37 (that's what you get if you run Metafont with mag:=magstep(.5)).
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38
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39 The time to call this is after you read the font spec from the DVI
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40 file, but before you look up any files -- do the usual floating-point
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41 computations, and then fix up the result. */
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42
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43 extern unsigned kpse_magstep_fix P3H(unsigned dpi, unsigned bdpi, int *m_ret);
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44
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45 #endif /* not KPATHSEA_MAGSTEP_H */