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  postscript
26       fonts, or when comparing a font with references to one without.
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28       3)     The postscript hints or truetype instructions are different.
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30       4)     The font names (the truetype 'name' table) differ.
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32       5)     The kerning (and other gpos information) differs.
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34       6)     The ligatures (and other gsub information) differ.
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36       7)     Any bitmap strikes present in one font but not in the other.
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38       8)     Any  bitmap  characters present in one strike of one font but in
39              the equivalent strike of the other.
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41       9)     Any bitmap characters which differ.
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OPTIONS

44       --help Provide a description with a list of the available options.
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46       --ignorehints
47              Suppress the reporting of hint/instruction differences.
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49       --ignoregpos
50              Suppress the reporting of kerning (and other gpos) differences.
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52       --ignoregsub
53              Suppress the reporting of ligature (and other gsub) differences.
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55       --ignorenames
56              Suppress the reporting of name string differences.
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58       --ignorebitmaps
59              Suppress the reporting of bitmap differences.
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61       --exact
62              Require outlines to match exactly.
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64       --warn Warn if the outlines/references are slightly different.
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66       -merge outfile
67              Store a merged version of the two fonts into the specified  out‐
68              put file.  The merged data will be based on sfdfile1, as well as
69              any characters present in  sfdfile2  but  not  in  sfdfile1will‐
70              beadded,andtheoutlinesof  sfdfile2  will  be placed in the back‐
71              ground.  Finally, for any characters with different outlines  or
72              references  the background of the the character will contain the
73              outlines from sfdfile2 (references will be  unlinked  into  out‐
74              lines and those outlines also will be added)
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76       --usage
77              Display the usage description.
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79       --version
80              Display the current version
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SEE ALSO

83       fontforge(1)
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85       The HTML version of the fontforge manual at:
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87       http://fontforge.sourceforge.net/
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AUTHOR

90       Copyright  (C)  2000-2006  by George Williams (gww@silcom.com).  Manual
91       page heavily rewritten and modified to use standard -man(5)  macros  by
92       R.P.C. Rodgers (rodgers@nlm.nih.gov), 23 October 2002.
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96                                 8 April 2006                       SFDDIFF(1)