RFR: 8269806: Emoji rendering on Linux [v18]

[Nikita Gubarkov]

On Wed, 1 Feb 2023 16:10:51 GMT, Nikita Gubarkov <duke at openjdk.org> wrote:

>> It was implemented in JetBrains Runtime a year ago and was ported & refactored for this PR
>> It includes:
>> - Bitmap glyph loading via Freetype
>> - Manual scaling & transformation of bitmap glyphs with nearest-neighbor or bilinear-mipmap style algorithms depending on the text antialiasing hint
>> - Storing BGRA glyphs in glyph cache & rendering them as plain images, as currently used XRender text drawing functions doesn't support colored glyphs
>> - Small fixes in related code like null-checks which could cause NPE & comment typos
>
> Nikita Gubarkov has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 26 commits:
> 
>  - Dynamic loading of ftcolor.h symbols on Linux.
>  - Replace unicodeToUnits with Character.toChars in CCharToGlyphMapper
>  - Add braces to ifs.
>  - Make tests headful.
>  - Merge branch 'master' into JDK-8269806
>  - Remove ftcolor.c
>  - Skip tests if required font is absent
>  - Fix pointer to jlong conversion on x86
>  - Merge branch 'master' into JDK-8269806
>  - Merge branch 'master' into JDK-8269806
>  - ... and 16 more: https://git.openjdk.org/jdk/compare/60c535de...57c0b57d

Yes, the reason for moving it was that exclusion ranges don't work with fallbacks 🫠

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PR: https://git.openjdk.org/jdk/pull/4798