RFR: 8269806: Emoji rendering on Linux [v2]

[Hiroshi Miura]

On Thu, 24 Mar 2022 22:36:28 GMT, Nikita Gubarkov <duke at openjdk.java.net> 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 incrementally with one additional commit since the last revision:
> 
>   8269806: Fix builds with old Freetype (before 2.5)

I can reproduce, but also cannot reproduce with same JVM option ` -Dsun.java2d.xrender=false -Dsun.java2d.opengl=false` on Mint Linux 20.03.

![repro](https://user-images.githubusercontent.com/123720/160788680-96da21f3-6436-48c4-bf48-7ea83adc0dcf.png)

Upper launched from shell, lower run from IDE. Interestingly when click broken glyph, it show a good  image.

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PR: https://git.openjdk.java.net/jdk/pull/4798