am 4d4e6bc8: Caching for layouts and harfbuzz faces

* commit '4d4e6bc8118d15542f1f2a9218f0f7a91a29474f':
  Caching for layouts and harfbuzz faces
tree: cdfd772d61a6eb71d7268f5d278e82202a247769
  1. include/
  2. libs/
  3. sample/