Comments (10)
rougier
commented on June 6, 2024
Do you know if Fira has actual kerning information ?
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tayloraswift
commented on June 6, 2024
Yes, it does
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rougier
commented on June 6, 2024
Ok, I will try to investigate using same method as the bbox
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rougier
commented on June 6, 2024
From the script below, I get some flags but none for the kerning. Maybe kerning is present but freetype does not advertise it (and in this case, there is not much we can do).
import freetype
face = freetype.Face('FiraSans-Book.ttf')
print("Scalable: ", bool(face.face_flags & freetype.FT_FACE_FLAG_SCALABLE))
print("Fixed sizes: ", bool(face.face_flags & freetype.FT_FACE_FLAG_FIXED_SIZES))
print("Fixed width: ", bool(face.face_flags & freetype.FT_FACE_FLAG_FIXED_WIDTH))
print("SFNT: ", bool(face.face_flags & freetype.FT_FACE_FLAG_SFNT))
print("Horizontal: ", bool(face.face_flags & freetype.FT_FACE_FLAG_HORIZONTAL))
print("Vertical: ", bool(face.face_flags & freetype.FT_FACE_FLAG_VERTICAL))
print("Kerning: ", bool(face.face_flags & freetype.FT_FACE_FLAG_KERNING))
print("Fast glyphs: ", bool(face.face_flags & freetype.FT_FACE_FLAG_FAST_GLYPHS))
print("Multiple masters: ", bool(face.face_flags & freetype.FT_FACE_FLAG_MULTIPLE_MASTERS))
print("Glyph names: ", bool(face.face_flags & freetype.FT_FACE_FLAG_GLYPH_NAMES))
print("External stream: ", bool(face.face_flags & freetype.FT_FACE_FLAG_EXTERNAL_STREAM))
print("Hinter: ", bool(face.face_flags & freetype.FT_FACE_FLAG_HINTER))
print("CID Keyed: ", bool(face.face_flags & freetype.FT_FACE_FLAG_CID_KEYED))
print("Tricky: ", bool(face.face_flags & freetype.FT_FACE_FLAG_TRICKY))
Scalable: True
Fixed sizes: False
Fixed width: False
SFNT: True
Horizontal: True
Vertical: False
Kerning: False
Fast glyphs: False
Multiple masters: False
Glyph names: True
External stream: False
Hinter: True
CID Keyed: False
Tricky: False
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rougier
commented on June 6, 2024
Also, from freetype documentation:
Not all font formats contain kerning information, and not all kerning formats are supported by FreeType; in particular, for TrueType fonts, the API can only access kerning via the ‘kern’ table. OpenType kerning via the ‘GPOS’ table is not supported! You need a higher-level library like HarfBuzz, Pango, or ICU, since GPOS kerning requires contextual string handling.
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tayloraswift
commented on June 6, 2024
Fira, like the vast majority of modern fonts only has GPOS kerning and no ttf “kern” table. So that would explain it. But how can freetype lack such a thing? It sounds pretty essential
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rougier
commented on June 6, 2024
It is essential and can become pretty complex for some languages . I imagine this is the reason why freetype doesn't handle it outside the kern table. You'll have to use HarfBuzz or pango.
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tayloraswift
commented on June 6, 2024
is it possible for freetype to just return the opentype kerning table itself so I can read latin kern pairs off of it?
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rougier
commented on June 6, 2024
I don't know. You should ask on the freetype mailing list.
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tayloraswift
commented on June 6, 2024
ugh so the FAQ says Well, the engine already reads OpenType/CFF files perfectly. What it doesn't do is handling ‘OpenType Layout’ tables.
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Related Issues (20)
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