GD library setting causes an unfixable bug with Cyrillic letters

[u1156]

ISSUE TYPE

• Bug Report

OS / ENVIRONMENT

1. Host operating system and version: MacOS Catalina 10.15.7
2. (Windows) Native Docker or Docker Toolbox:
3. Docker version: 19.03.13
4. Docker Compose version: 1.27.4
5. (Linux) Is SELinux enabled?:
6. What git commit hash are you on?: 4b23dd6

SUMMARY

In the Devilbox PHP GD Library is configured with 'JIS-mapped Japanese Font Support: enable'.
It causes an unfixable bug with char detection and Cyrillic letters used in imagettftext() and imagettfbbox().
Adding double conversion with mb_convert_encoding( $text, "SJIS", "UTF-8" ); is not a valuable option because it's not working as one would expect. It can convert about 85% letters but not all. Also double conversion is not optimal.
I heard that GD devs are a long time aware of this bug but it still exists.

Right now if someone uses Devilbox to run a project which relies on imagettftext() + Cyrillic letters it will not work.

It can be fixed by adding an option to disable this GD setting completely. Probably a special PHP image where PHP/GD will be built with configure --disable-gd-jis-conv?

STEPS TO REPRODUCE

1. Install Devilbox as always.
   Check phpinfo(). Expect to see JIS-mapped Japanese Font Support: enable in GD section.
2. Create and run a php script:
   Use font PtSans (ttf can be downloaded from Google Fonts) as a font with Cyrillics support
   Use https://www.php.net/manual/ru/function.imagettfbbox.php
   $text_box = imagettfbbox( $fontSize, 0, $font, 'текст на русском языке не работает' );

The same steps are valid for imagettftext();

EXPECTED BEHAVIOUR

Be able to use imagettftext();

ACTUAL BEHAVIOUR

Warning: imagettftext() [function.imagettftext]: any2eucjp(): invalid code in input string

[cytopia]

Fixed in #743