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Draft: reimplement lv_font_conv as python script lv_font_conv.py #2413

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Draft: reimplement lv_font_conv as python script lv_font_conv.py #2413

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@NeroBurner NeroBurner commented Feb 6, 2026 •
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Recreate the NodeJS script lv_font_conv in Python as lv_font_conv.py using Pillow library

run in InfiniTime directory with:

python3 src/resources/lv_font_conv.py --size 200 --output "build/fonts/jetbrains_mono_bold_20_py.c" --bpp 1 --format lvgl --no-compress --font "src/displayapp/fonts/JetBrainsMono-Bold.ttf" --range "0x20-0x22" --range "0x50-0x55"

Currently not working as the created glyphs don't quite match the originial JS versions

Glyps 21 (!), 22 ", 50 P and 55 U from Python Script:

out_0_21_c out_0_22_m out_0_50_m out_0_55_m

Same glyps from JS:

out_js_u21 out_js_u22 out_js_u50 out_js_u55

@NeroBurner
WIP: generate: show executed lv_xxx_conv commands
a357168
@NeroBurner
[WIP] print calling script before lv_font_conv commands
0e57967
@NeroBurner
lv_font_conv_py: first skeleton with args, no --fonts yet
f6fc11f
@NeroBurner
lv_font_conv: add import for ttl
1cac439
@NeroBurner
lv_font_conv.py: use PIL.ImageFont and ImageDraw for rendering to png
3348615
@NeroBurner
lv_font_conv: support --range parameter, print text to out.png
1b52be2
@NeroBurner
lv_font_conv_py: implement FontArgs propperly
8ea4fbd
@NeroBurner
lv_font_conv_py: fix symbols args appending
f90fe7c
@NeroBurner
lv_font_conv_py: more printing, draw.textlength
8530b1f
@NeroBurner
lv_font_conv_py: use font.getlength instead of draw.textlength
134de24
@NeroBurner
lv_font_conv: first steps implementing lvgl format
b045d5a
@NeroBurner
lv_font_conv: finish all lvgl sections, simple cmaps
1ace785
@NeroBurner
lv_font_conv: adv_w is hard multiplied by 16
edaa35e
@NeroBurner
lv_font_conv: use mask and bbox on mask for bbox
4659c37
@NeroBurner
lv_font_conv: inching closer, dimensions nearly right, ofs_y wrong, p…
b1bd8d8 
…ixel

The rendered glyps-bitmaps are nearly right. Off by one pixel width most
of the time.

Offset-y is a mystery to me. As well as the baseline value at the bottom
@NeroBurner NeroBurner added needs more work This PR needs more work maintenance Background work labels Feb 6, 2026
@NeroBurner NeroBurner marked this pull request as draft February 6, 2026 07:21
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github-actions bot commented Feb 6, 2026

Build size and comparison to main:

Section Size Difference
text 385232B 0B
data 944B 0B
bss 22640B 0B

Run in InfiniEmu

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