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[core] Use ICU for bidirectional text layout and Arabic text shaping #6984

Merged
merged 3 commits into from
Nov 17, 2016
Merged

[core] Use ICU for bidirectional text layout and Arabic text shaping #6984

merged 3 commits into from
Nov 17, 2016

Commits on Nov 17, 2016

  1. [core] Use UTF-16 instead of UTF-32 for label features to avoid extra… 

    … conversions and reduce in-memory size.

Continue to use uint32 as glyph ID to maintain Glyph PBF, even though we're only using 16 bits of that uint32.
Use std::codecvt instead of boost::unicode_iterator for UTF8->UTF16 conversions.
    @ChrisLoer
    ChrisLoer committed Nov 17, 2016
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  2. [core] Add ICU package for Bidirectional text support and arabic text… 

    … shaping.

Apply bidi and shaping in symbol_layout.
Add utility functions for converting to and from UTF-16.
    @ChrisLoer
    ChrisLoer committed Nov 17, 2016
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  3. [core] Add minimal line breaking support for RTL text.

    @ChrisLoer
    ChrisLoer committed Nov 17, 2016
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