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bors-servo de898c8ee9 Auto merge of #103 - pcwalton:units-per-em, r=emilio

Add a binding to `CGFontGetUnitsPerEm()`

Pathfinder 2 is using this. It saves a little bit of time and memory by avoiding creation of `CTFont` objects just to do this simple query.

r? @jdm

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2017-11-13 22:41:22 -06:00