Michael Tsai
Emoji Fonts Use Undocumented Features: http://mjtsai.com/blog/2016/03/11/emoji-fonts-use-undocumented-features/ … #mjtsaiblog
Rosyna Keller
@mjtsai This is *entirely* by design. Color Emoji uses private features only available for system fonts to prevent a fixed specification.
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@rosyna So are you saying that there can't/shouldn't be alternative fonts? -
@mjtsai correct. It would dramatically increase security attack surface area, it has very special handling, and it's changed multiple times. -
@mjtsai There is also not a SINGLE font creation tool that creates font files without at least one extremely MAJOR error in it. -
@mjtsai which made fixing security bugs in Apple's FontParsers extremely difficult. I often had to guess the intent behind a buggy table! -
@mjtsai If you just bail out with a fatal error, designers complain their precious, expensive but buggy fonts stop working. -
@mjtsai If it sounds like I'm bitter towards buggy fonts and buggy tools, it's because I am! Reading old font docs from 1993 is not fun!
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@mjtsai Because AppleColorEmoji doesn't have to conform to a spec, Apple has been able to improve it greatly from OS to OS release. -
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Ned Holbrook
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