1SFDDIFF(1)                  General Commands Manual                 SFDDIFF(1)
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NAME

6       sfddiff - compare two font files
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SYNOPSIS

9       sfddiff   [--help]   [--ignorehints]   [--ignorenames]   [--ignoregpos]
10       [--ignoregsub] [--ignorebitmaps] [--exact] [--warn]  [--merge  outfile]
11       [--usage] [--version] fontfile1 fontfile2
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DESCRIPTION

14       The program sfddiff compares two font files, which may be in any format
15       fontforge(1) can read.  It will notice the following differences:
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17       1)     Characters are present in one font but not in the other.
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19       2)     Characters are present in both fonts but have different sets  of
20              outlines  or  references.   The outlines may be compared so that
21              only exact matches are accepted, or so that a fuzzier  match  is
22              used.  Similarly references may need to match exactly, or may be
23              matched after an unlink.
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25              This fuzzy comparison is  useful  when  comparing  truetype  and
26              postscript  fonts,  or  when comparing a font with references to
27              one without.
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29       3)     The postscript hints or truetype instructions are different.
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31       4)     The font names (the truetype `name' table) differ.
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33       5)     The kerning (and other `gpos' information) differs.
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35       6)     The ligatures (and other `gsub' information) differ.
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37       7)     Any bitmap strikes present in one font but not in the other.
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39       8)     Any bitmap characters present in one strike of one font  but  in
40              the equivalent strike of the other.
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42       9)     Any bitmap characters which differ.
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OPTIONS

45       --help Provide a description with a list of the available options.
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47       --ignorehints
48              Suppress the reporting of hint/instruction differences.
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50       --ignoregpos
51              Suppress  the  reporting  of  kerning (and other `gpos') differ‐
52              ences.
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54       --ignoregsub
55              Suppress the reporting of ligature (and  other  `gsub')  differ‐
56              ences.
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58       --ignorenames
59              Suppress the reporting of name string differences.
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61       --ignorebitmaps
62              Suppress the reporting of bitmap differences.
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64       --exact
65              Require outlines to match exactly.
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67       --warn Warn if the outlines/references are slightly different.
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69       --merge outfile
70              Store  a merged version of the two fonts into the specified out‐
71              put file.  The merged data will be based on sfdfile1, as well as
72              any  characters  present in sfdfile2 but not in sfdfile1 will be
73              added, and the outlines of sfdfile2 will be placed in the  back‐
74              ground.   Finally, for any characters with different outlines or
75              references the background of the the character will contain  the
76              outlines  from  sfdfile2  (references will be unlinked into out‐
77              lines and those outlines also will be added).
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79       --usage
80              Display the usage description.
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82       --version
83              Display the current version.
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SEE ALSO

86       fontforge(1)
87
88       The HTML version of the fontforge manual at:
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90              http://fontforge.sourceforge.net/
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AUTHOR

93       Copyright (C) 2000-2006 by George  Williams  (gww@silcom.com).   Manual
94       page  heavily  rewritten and modified to use standard -man(5) macros by
95       R.P.C. Rodgers (rodgers@nlm.nih.gov), 23 October 2002.
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99                                 8 April 2006                       SFDDIFF(1)