Seigo Nonaka 109b667554 Improve Paint.hasGlyph performance by caching hb_font_t ...

It turned out that hb_font_t creation is not a lightweight operation.
Especially, Paint.hasGlyph creates hb_font_t for all existing fonts
every time. To improve the performance, cache hb_font_t instead
of hb_face_t.

Note that to calculate horizontal advance, MinikinPaint needs to be
associated with hb_font_t by calling hb_font_set_funcs. With this patch,
hb_font_set_funcs may be called multiple times for the same hb_font_t
object. However this is not an issue since MinikinPaint is unique
during layout.

Bug: 26784699

Change-Id: I516498ae9f0127d700fc9829327e9789845a1416

2016-02-04 12:26:10 +09:00

engine/src/flutter

Improve Paint.hasGlyph performance by caching hb_font_t

2016-02-04 12:26:10 +09:00

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