jamesgk e94071a2d8 Specify max error in em instead of font units
This should be more compatible between fonts with different UPM. In
fact, it should work within a single call with such fonts.

The default max error is now 0.0025 em, which is about 5 units for a
2048 UPM font.
2015-11-20 12:04:48 -08:00
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