Displaying Emoji in custom font is very slow

[edwin0cheng]

Tested versions

• Reproducible in 4.4 dev [cf038de]

System information

Godot v4.4.dev (cf038de) - Arch Linux #1 SMP PREEMPT_DYNAMIC Fri, 22 Nov 2024 16:04:27 +0000 on X11 - X11 display driver, Multi-window, 2 monitors - OpenGL 3 (Compatibility) - NVIDIA GeForce RTX 4060 Ti (nvidia; 565.57.01) - 13th Gen Intel(R) Core(TM) i7-13700 (24 threads)

Issue description

I found that using a custom font with emoji is very slow. It basically halt the editor.
It seem to relate to #88809 (I tried module_text_server_adv_enabled=no and module_text_server_fb_enabled=yes, but no luck)

And when I try to debug, it seem to spend all the time in XML Parsing for SVG.

I would like to help to debug and fix it but I am very new to Godot code base.

Steps to reproduce

1. Add a custom font in project (I use https://fonts.google.com/noto/specimen/Noto+Color+Emoji)
2. Go to Pre-render Configuration / Glyphs from Text :

3. Paste this text to the TextEdit Field:

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Minimal reproduction project (MRP)

debug-text-bug.zip

[Calinou]

cc @bruvzg

[AThousandShips]

Sounds like:

• Setting a text that contains emojis to a textedit is slow #88809

[edwin0cheng]

Maybe I found where is the problem :

godot/modules/text_server_adv/thorvg_svg_in_ot.cpp

Lines 89 to 91 in c2e4ae7

	Ref<XMLParser> parser;
	parser.instantiate();
	parser->_open_buffer((const uint8_t *)document->svg_document, document->svg_document_length);

We parse the full SVG XML for every glyph slot, but we only use part of it. Normally, glyph slots share a few XML files that we could cache.

I would implement a PR for that if that is what we should do.