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<TITLE>fontlint -- A program for checking the validity of fonts</TITLE>
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<H1 ALIGN=Center>
fontlint<BR>
<SMALL>A program for checking the validity of fonts</SMALL>
</H1>
<P>
<CODE>fontlint fontfile1 ...</CODE>
<P>
<EM>fontlint</EM> checks a font for certain standard problems
<P>
It will notice:
<UL>
<LI>
Any glyphs with intersecting (or self-intersecting) contours.
<LI>
Any contours drawn in the wrong orientation
<LI>
Any glyphs with a flipped reference
<LI>
Missing points at extrema.
</UL>
<P>
For sfd fonts it will also notice:
<UL>
<LI>
Any open contours (more an issue in sfd files than in released fonts)
<LI>
Adjacent points too far apart in a glyph
<LI>
Unknown glyph referenced in GSUB/GPOS/MATH
</UL>
<P>
For PostScript fonts it will also notice:
<UL>
<LI>
More points in a glyph than allowed by PostScript.
<LI>
Too many hints in a glyph.
<LI>
Invalid glyph name.
<LI>
Missing BlueValues entry in PostScript Private dictionary
<LI>
Odd number of elements in either the BlueValues or OtherBlues entries in
the PostScript Private dictionary.
<LI>
Disordered elements in either the BlueValues or OtherBlues entries in the
PostScript Private dictionary.
<LI>
Too many elements in either the BlueValues or OtherBlues entries in the
PostScript Private dictionary.
<LI>
Elements too close in either the BlueValues or OtherBlues entries in the
PostScript Private dictionary (must be at least 2*BlueFuzz+1 apart).
<LI>
Non-integral elements in either the BlueValues or OtherBlues entries in the
PostScript Private dictionary.
<LI>
Alignment zone height in either the BlueValues or OtherBlues is too big for
the BlueScale in the PostScript Private dictionary.
<LI>
Odd number of elements in either the FamilyBlues or FamilyOtherBlues entries
in the PostScript Private dictionary.
<LI>
Disordered elements in either the FamilyBlues or FamilyOtherBlues entries
in the PostScript Private dictionary.
<LI>
Too many elements in either the FamilyBlues or FamilyOtherBlues entries in
the PostScript Private dictionary.
<LI>
Elements too close in either the FamilyBlues or FamilyOtherBlues entries
in the PostScript Private dictionary (must be at least 2*BlueFuzz+1 apart).
<LI>
Non-integral elements in either the FamilyBlues or FamilyOtherBlues entries
in the PostScript Private dictionary.
<LI>
Alignment zone height in either the FamilyBlues or FamilyOtherBlues is too
big for the BlueScale in the PostScript Private dictionary.
<LI>
Bad BlueFuzz entry in PostScript Private dictionary.
<LI>
Bad BlueScale entry in PostScript Private dictionary.
<LI>
Bad StdHW entry in PostScript Private dictionary.
<LI>
Bad StdVW entry in PostScript Private dictionary.
<LI>
Bad StemSnapH entry in PostScript Private dictionary.
<LI>
Bad StemSnapV entry in PostScript Private dictionary.
<LI>
StemSnapH does not contain StdHW value in PostScript Private dictionary.
<LI>
StemSnapV does not contain StdVW value in PostScript Private dictionary.
<LI>
Bad BlueShift entry in PostScript Private dictionary.
<LI>
Bad 'CFF ' table.
</UL>
<P>
For TrueType fonts it will also notice:
<UL>
<LI>
More points in a glyph than specified in 'maxp'
<LI>
More paths in a glyph than specified in 'maxp'
<LI>
More points in a composite glyph than specified in 'maxp'
<LI>
More paths in a composite glyph than specified in 'maxp'
<LI>
Instructions longer than allowed in 'maxp'
<LI>
More references in a glyph than specified in 'maxp'
<LI>
References nested more deeply than specified in 'maxp'
<LI>
Bad 'glyf' or 'loca' table
</UL>
<P>
In any sfnt (True or OpenType font):
<UL>
<LI>
Bad sfnt table header, bad file/table checksums, overlapping tables, standard
tables with incorrect lengths, etc.
<LI>
Bad PostScript fontname entry in the 'name' table
<LI>
Bad 'hhea', 'hmtx', 'vhea' or 'vmtx' table
<LI>
Bad 'cmap' table
<LI>
Bad 'EBDT', 'bdat', 'EBLC' or 'bloc' (embedded bitmap) table
<LI>
Bad Apple GX advanced typography table
<LI>
Bad OpenType advanced typography table
<LI>
Bad version number in OS/2 table (must be >0, and must be >1 for OT-CFF
fonts)
</UL>
<H3>
See Also
</H3>
<P>
<A HREF="overview.html">FontForge</A>
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