Jason Simmons 073d9af904 libtxt: cache fallback fonts found by a Minikin font collection (flutter/engine#14482) ...

If a new fallback font is discovered during paragraph layout, the fallback
font cache in txt::FontCollection will use that font in future layouts.

However, that cache is not available if the new fallback font needs to be
used for other characters within the current layout.  This PR adds a cache
to minikin::FontCollection and checks whether fonts in the cache can handle
a character before calling the fallback font provider.

See https://github.com/flutter/engine/pull/13257

2019-12-13 15:18:37 -08:00

..

src/flutter

libtxt: cache fallback fonts found by a Minikin font collection (flutter/engine#14482)

2019-12-13 15:18:37 -08:00