[LVGL] Performance issue while use large font file

[aleccy]

Describe the bug
When select a large font file, such as Chinese font file (as below image). The studio will be very slow while loading a poject file or copy-paste(may need to wait for more than 5 minutes).

To Reproduce
Steps to reproduce the behavior:

1. Add a large font file, you may get it from https://fontmeme.com/fonts/alibaba-puhuiti-font/
2. Set font size to 16 and ranges 0-99999
3. Create any object with the added font.
4. Very slow while build project or copy-paste or load project

Environment and version

• OS: Windows
• Version 0.23.2

**Project type

• LVGL
  ** LVGL version (if used)**
• 9.x

[MOC-Q]

I also encountered a similar problem here. Adding only some unicode encoded characters would also get stuck for a while, about a minute.eg. 32-127,0x4E00-0x9FFF

[rayene01]

I get the same issues here. I hope they fix that soon.

[mvladic]

The reason for this is when loading project we load all the font glyphs and when font is selected it shows those glyphs automatically. This is now optimized, glyphs are not loaded by default and to view them you need to press View Glyphs button:

[aleccy]

Thanks a lot for the fix. But this fix takes in another issue, when a design uses several fonts, how can I load these fonts together with one button, currently should I click view glyphs on every font?

[mvladic]

Thanks a lot for the fix. But this fix takes in another issue, when a design uses several fonts, how can I load these fonts together with one button, currently should I click view glyphs on every font?

All the fonts will be loaded into LVGL and used inside Edit and Run mode, you don't need to take any special action. But, to view glyphs, for whatever reason, you need to explicitly press View Glyphs button (you can view glyphs for multiple fonts at the same time, each in its own tab).