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olikraus / U8g2_for_Adafruit_GFX

Add U8g2 fonts to any Adafruit GFX based graphics library.
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Error compiling when included alongside U8g2lib.h #31

Closed Spirik closed 2 years ago

Spirik commented 2 years ago

Hello, @olikraus!

I'm having a rather edge case issue, when trying to compile a sketch, libraries in which can be simultaneously dependent on both U8g2lib and U8g2_for_Adafruit_GFX: I get a lot of multiple definition errors.

image

To reproduce, just include both libraries in your sketch:

#include <U8g2lib.h>
#include <U8g2_for_Adafruit_GFX.h>

I am writing GEM library for managing graphic multi-level menus. It currently supports AltSerialGraphicLCD and U8g2 libraries. And I am in a process of adding support for Adafruit GFX library. And I'd like to implement fonts via U8g2_for_Adafruit_GFX, so that visually (and partially code-wise and feature-wise) menu look similar to what user would get from U8g2 version.

So I include all of the above libraries in corresponding .h files of the GEM (GEM.h, GEM_u8g2.h, GEM_adafruit_gfx.h). While user is expected to include only one of them in their sketch, at a compilation step compiler would require all of the libraries above (unless they explicitly excluded from config.h file). It won't affect compiled sketch size (as only needed version of library will be linked), however the compiler will throw the above error.

And again, I understand, that this is very narrow issue and unlikely to be relevant for many other users. So my plan B solution to the problem will be to just stick with the default font engine that Adafruit GFX library provides.

Either way, thank you for the great libraries you've created 🙏

olikraus commented 2 years ago

You are right, u8g2 and this lib will not work together 😟

Spirik commented 2 years ago

Ok, understood!

The followup (and slightly offtopic) question: can you suggest any possible way to convert some of the U8g2 fonts to Adafruit GFX format? I am using u8g2_font_6x12_tr and u8g2_font_tom_thumb_4x6_tr for menu items and titles. That way I at least could maintain similar visual appearance of the menu.

olikraus commented 2 years ago

The followup (and slightly offtopic) question: can you suggest any possible way to convert some of the U8g2 fonts to Adafruit GFX format? I am using u8g2_font_6x12_tr and u8g2_font_tom_thumb_4x6_tr for menu items and titles. That way I at least could maintain similar visual appearance of the menu.

I am not aware of any conversion method here. At least the bdf sources of the mentioned fonts are available in the u8g2 repo. Not sure if this helps.

Spirik commented 2 years ago

@olikraus Thanks! That's pretty much exactly what I ended up doing - converting original bdf files to Adafruit GFX format via Python script (and then tweaked resulted code manually).