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justvanrossum avatar justvanrossum commented on August 12, 2024 1

After trying a few things, I think it's a PyObjC bug with CTFontGetGlyphsForCharacters. I suspect it has to encode the string as UTF-16, but doesn't.

https://developer.apple.com/documentation/coretext/1510813-ctfontgetglyphsforcharacters?language=objc, and UniChar is a 16bit type.

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justvanrossum avatar justvanrossum commented on August 12, 2024

Can reproduce. The relevant code is here:

drawbot/drawBot/context/baseContext.py

Lines 1796 to 1805 in 100dbdf

def fontContainsCharacters(self, characters):
"""
Return a bool if the current font contains the provided `characters`.
Characters is a string containing one or more characters.
"""
font = self._getNSFontWithFallback()
if font is None:
return False
result, glyphs = CoreText.CTFontGetGlyphsForCharacters(font, characters, None, len(characters))
return result

It looks pretty innocent.

I wonder if somehow PyObjC does something wrong when converting the characters argument.

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josh-hadley avatar josh-hadley commented on August 12, 2024

Thanks @justvanrossum and @typemytype for the quick fix!

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