tree 38265e1b99cd801080a162c91c21890bb9907b06
parent af66defab954cb421ca110193eed9477c8541e2a
author Elias Naur <elias.naur@gmail.com> 1529953844 +0200
committer Nigel Tao <nigeltao@golang.org> 1530166838 +0000

font/sfnt,font/opentype: correct font height computation

According to https://www.freetype.org/freetype2/docs/glyphs/glyphs-3.html
the line spacing of a font is computed as

line space = ascent - descent + linegap

Use that formula to compute the Height field of a Font's Metrics.

Change-Id: I1c44eca9f662e0aae68716cd8859670fe0b394d7
Reviewed-on: https://go-review.googlesource.com/120815
Reviewed-by: Nigel Tao <nigeltao@golang.org>