[Webkit-unassigned] [Bug 215259] [WinCairo] Use Cairo DirectWrite font backend

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215259

--- Comment #8 from Fujii Hironori <Hironori.Fujii at sony.com> ---
I found some minor issues.

Because WinCairo is using Uniscribe for shaping, I need to use
DirectWrite GDI compatible mode at the moment. Unfortunately,
DirectWrite GDI compatible mode looks jaggier than GDI. Even
though GDI is rendering text with subpixel antialiasing both
vertically and horizontally, DirectWrite GDI compatible mode
seems to do it only horizontally.

Uniscribe doesn't combine some emoji sequences.
https://getemoji.com/

Both issues are related to Uniscribe. WinCairo should use
DirectWrite or HarfBuzz DirectWrite backend for shaping.

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