Support standard names for freetype hinting flags. #17380
Merged
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We have a custom mapping of FreeType hinting flags (FT_LOAD_DEFAULT,
FT_LOAD_NO_AUTOHINT, FT_LOAD_FORCE_AUTOHINT, FT_LOAD_NO_HINTING) to our
own string names ("either", "native", "auto", "default") which is
basically not documented anywhere and makes searching the docs tricky,
even when one knows where to look for FreeType flags. Add support for
synonyms which map directly to the standard flag names ("default",
"no_autohint", "force_autohint", "no_hinting") which should at least
make the correspondence more transparent.
There's not much benefit in killing the old synonyms, so I left them in
place.
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