tree a59ef2c1d34020f61bf182e416f9de6ba23e2f42
parent 309de7904d3f1f39e465bfdb492eb30fa93c5b48
author Mike Reed <reed@google.com> 1555682530 -0400
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1555684528 +0000

use char-to-glyph cache in freetype typeface

Note: most of the slow-down (before this CL) is due to trashing freetype
objects (FTLibrary and FTFace), since these are ref-counted, but they
only persist long-term if there is an active scalercontext of the same
typeface.

A longer-term fix is to rethink the lifetimes of these freetype objects.
After that, we should remeasure onCharsToGlyphs(), and see if the
cache is still needed.

Bug: 935198
Bug: skia:8997
Change-Id: I1ba4adc57319d620ba4ac0fe0f2877ee62052cbd
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/209178
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>