Jason Simmons ea84dd9118 libtxt: extend Minikin to find a fallback font if its font collection can not match a given character (flutter/engine#4595) ...

Minikin layout uses a FontCollection containing a list of pre-selected fonts
for a particular font family.  This patch extends the FontCollection to invoke
a hook provided by libtxt if layout sees a character that can not be rendered
by any font in the collection.

* Change the Minikin lock to a recursive mutex.  This is required because the
  fallback font provider may create new fonts during a layout operation that
  already holds the lock.
* Implement a fallback font provider hook that queries Skia for fonts matching
  an unrecognized character.
* Maintain a cache of fallback fonts.  Prepopulate the cache with fonts
  covering some commonly used character classes.
* Add a last resort font list for cases where Skia's font manager can not
  find any font for a character (similar to Blink's FontCache::getLastResortFallbackFont)

2018-01-29 12:06:48 -08:00

engine/src/flutter

libtxt: extend Minikin to find a fallback font if its font collection can not match a given character (flutter/engine#4595)

2018-01-29 12:06:48 -08:00

DEPS

Roll Dart to da1f52592ef73fe3afa485385cb995b9aec0181a (flutter/engine#4585)

2018-01-24 15:21:50 -08:00

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