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vfig/gist:41f25867fc7af6555110

Created July 7, 2014 09:47
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Calculate the line height of a CGFontRef
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gistfile1.m
CGFloat CGFontGetLineHeight(CGFontRef font, CGFloat fontSize)
{
if (!font) return 0.0f;
int lineHeightGlyphUnits = CGFontGetAscent(font) - CGFontGetDescent(font) + CGFontGetLeading(font);
CGFloat lineHeightEms = (CGFloat)lineHeightGlyphUnits / CGFontGetUnitsPerEm(font);
return lineHeightEms * fontSize;
}
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