fontconvert upgrades

[ftlpilot]

Can I put in a request to include the degree character 0xB0 (176 dec) glyph when fontconvert converts a TTF file.

Also, is it possible to fix the main algorithm, so odd dots don't sometimes appear at the edges of large fonts.

[BillyDonahue]

Can you run fontconvert yourself with a range that includes the 0xB0 code point?

The problem is that the GFXfont struct has no way to represent a noncontiguous range of code points, and takes the reasonable default of only encoding the ASCII printable characters for the built-in fonts, but you aren't constrained to that range as a user of the library. You can generate and use your own GFXfont.

PS: What odd dots? I have been working with GFXfont a lot and haven't noticed this problem.
I have a visualizer I use to check the generated fonts, and it produces reasonable output as far as I can tell. Example: https://gist.github.com/BillyDonahue/fb9cc1fa11bb3a790e37036985d00203

[virxkane]

The problem is that the GFXfont struct has no way to represent a noncontiguous range of code points

This can be changed, for examples, like this: https://github.com/virxkane/nucleo-f446re-st7735spi-shield/blob/main/Inc/gfxfont.h
But, unfortunatly, this is out of roadmap.

[ftlpilot]

Thankx – useful info, I’ve setup a spare computer with Linux Mint, so I’ll see what I can get working with a modified fontconvert. I need LARGE (80pt) fonts for clocks, but only 0-9 and colon, to minimise progmem usage – if possible. From: Aleksey Chernov ***@***.*** Sent: Friday, 26 November 2021 01:16 To: adafruit/Adafruit-GFX-Library ***@***.***> Cc: ftlpilot ***@***.***>; Author ***@***.***> Subject: Re: [adafruit/Adafruit-GFX-Library] fontconvert upgrades (Issue #373) The problem is that the GFXfont struct has no way to represent a noncontiguous range of code points This can be changed, for examples, like this: https://github.com/virxkane/nucleo-f446re-st7735spi-shield/blob/main/Inc/gfxfont.h But, unfortunatly, this is out of roadmap <https://github.com/adafruit/Adafruit-GFX-Library#roadmap> . — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#373 (comment)> , or unsubscribe <https://github.com/notifications/unsubscribe-auth/AB53UK2XNQTOKOJY25Z42X3UNZAJ7ANCNFSM5IQPJCJA> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub> . <https://github.com/notifications/beacon/AB53UK5TXGOEE75OTGR6SV3UNZAJ7A5CNFSM5IQPJCJKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOHJPCXEI.gif>

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[BillyDonahue]

Happy hacking. If you're more handy with Python than C, I've ported fontconvert to Python. It also includes a gfxfont_preview tool to annotate a font header with C++ comments showing each glyph in ASCII art, which I find really useful for seeing what you're doing.

https://github.com/BillyDonahue/Adafruit-GFX-Library/tree/fontconvert_py

[nilclass]

@ftlpilot I was also looking for a way to include the degree character (°) into my font, and ended up hacking fontconvert to allow me to do it. Instead of adding support for multiple ranges (which complicates things not only on fontconvert's side, but also requires changes to the library code that uses the font), I decided to instead include the glyphs I needed in place of characters I did not need.
For more details, see this PR: #395