[Bug 461617] modified Sazanami-Gothic font showing vertical text rendering glitches not seen in the original

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https://bugzilla.redhat.com/show_bug.cgi?id=461617





--- Comment #14 from Akira TAGOH <tagoh at redhat.com>  2009-09-29 22:23:02 EDT ---
Thanks for analysing. here is more details in TTF spec:

GDEF Header
0000: 00 01 00 00 : Version of GDEF table
0004: 00 0c       : offset to GlyphClassDef table
0006: 00 00       : offset to AttachList table
0008: 00 16       : offset to LigCaretList table
000A: 00 00       : offset to Mark Attachment Class Definition table

GlyphClassDef table
000C: 00 02       : ClassFormat
000E: 00 01       : ClassRangeCount
                  : ClassRangeRecord[0]
0010: 00 03       : Start
0012: 35 0f       : End
0014: 00 01       : Class, 1 = base glyphs

LigCaretList table
0016: 00 04       : offset to Coverage table
0018: 00 00       : LigGlyphCount

Coverage table
001A: 00 02       : CoverageFormat
001C: 00 00       : GlyphCount


In either case, there are actually no glyph definitions in the coverage table.
I'm really wondering why it affects to this.
Is it freetype or HarfBuzz bug?

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