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author | Karl Berry <karl@freefriends.org> | 2006-01-17 21:41:51 +0000 |
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committer | Karl Berry <karl@freefriends.org> | 2006-01-17 21:41:51 +0000 |
commit | 487ca4806cc046076293cf6cc5fbba0db282bac7 (patch) | |
tree | 847b412ab5158dd7bdd7ed7e5a4cc3fbca94be32 /Build/source/texk/kpathsea/magstep.h | |
parent | a3d3111bfe26b8e5f5bc6049dfb2a4ca2edc7881 (diff) |
texk 1
git-svn-id: svn://tug.org/texlive/trunk@1485 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/texk/kpathsea/magstep.h')
-rw-r--r-- | Build/source/texk/kpathsea/magstep.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/Build/source/texk/kpathsea/magstep.h b/Build/source/texk/kpathsea/magstep.h new file mode 100644 index 00000000000..78672d8a25f --- /dev/null +++ b/Build/source/texk/kpathsea/magstep.h @@ -0,0 +1,48 @@ +/* magstep.h: declaration for magstep fixing. + + Copyright 1999, 2005 Olaf Weber. + Copyright 1994 Karl Berry. + + 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, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + +*/ + +#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 kpse_magstep_fix P3H(unsigned dpi, unsigned bdpi, int *m_ret); + +#endif /* not KPATHSEA_MAGSTEP_H */ |