tree bc4f96703836efb4d962ebac83e6e770fd19ca1c
parent d9c2484c482e024a5de5ea73d456fb873fb7e8ac
author Denys Smirnov <denis.smirnov.91@gmail.com> 1540933530 +0200
committer Nigel Tao <nigeltao@golang.org> 1542336369 +0000

font/sfnt: support fonts with "true" apple version tag

OpenType specification mentions that fonts might contain Apple
version tag that is equal to "true" (see note in [1]). Currently,
the library returns a parsing error for those fonts.

CL adds Apple this version tag to the validation code and allows
fonts to omit OS/2 table, as mentioned in the TrueType spec [2].

[1] https://docs.microsoft.com/en-us/typography/opentype/spec/otff#organization-of-an-opentype-font

[2] https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6OS2.html

Change-Id: I13406fe97b091f24aaabf9b477df9c8fc8df883c
Reviewed-on: https://go-review.googlesource.com/c/146078
Reviewed-by: Nigel Tao <nigeltao@golang.org>