| Value | Meaning | 
|---|---|
| DEFAULT0 | serialize glyph names, clusters and positions. | 
| NO_CLUSTERS1 | do not serialize glyph cluster. | 
| NO_POSITIONS2 | do not serialize glyph position information. | 
| NO_GLYPH_NAMES4 | do no serialize glyph name. | 
| GLYPH_EXTENTS8 | serialize glyph extents. | 
| GLYPH_FLAGS16 | serialize glyph flags. Since: 1.5.0 | 
| NO_ADVANCES32 | do not serialize glyph advances, glyph offsets will reflect absolute glyph positions. Since: 1.8.0 | 
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Flags that control what glyph information are serialized in hb_buffer_serialize_glyphs().