RFR: 8269806: Emoji rendering on Linux [v3]

[Alexey Ushakov]

On Wed, 30 Mar 2022 17:08:37 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 emoji rendering with -Dsun.java2d.xrender=false and AA=OFF

The latest version is working on Xorg
![image](https://user-images.githubusercontent.com/3232337/160914125-eb22c6c0-146e-4938-938d-b688683dd11d.png)

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