Work on abstractions for an ST7789 font and frame buffer #293

savanni · 2025-03-05T14:57:49Z

savanni commented

2025-03-05 14:57:49 +00:00

I'm driving toward libraries for drawing and for fonts on various screens as an abstraction. This introduces a Canvas trait and a Font trait.

The Canvas trait provides some stock drawing functions based on the set_pixel function, which applications need to implement based on the exact hardware they're driving.

The Font trait doesn't require client implementations, it just provides the framework for additional fonts. Clients will generally just import one of the existing fonts, which at this time is just a sixteen-segment display.

I'm driving toward libraries for drawing and for fonts on various screens as an abstraction. This introduces a Canvas trait and a Font trait. The Canvas trait provides some stock drawing functions based on the set_pixel function, which applications need to implement based on the exact hardware they're driving. The Font trait doesn't require client implementations, it just provides the framework for additional fonts. Clients will generally just import one of the existing fonts, which at this time is just a sixteen-segment display.

savanni added 6 commits 2025-03-05 14:57:49 +00:00

Worked out a font and a canvas 85e5d0bb5e

I'm adding a 16-segment-based font here, and have encoded the numbers 0-10.

I've also worked out a way to make a Canvas structure not crash the pico.

Do a static buffer allocation for the Canvas aea858dd17

Fix a bunch of the letters. Add a dot. 132c85e99d

Use bitflags to represent the font 155d2ba18e

Refactor the canvas and font 8288fdbb6b

Add a link to the sixteen-segment font source b444326c1c

savanni added 1 commit 2025-03-05 14:58:53 +00:00

Remove dead code bc9e24c0c9

savanni merged commit bc9e24c0c9 into main

2025-03-05 15:01:03 +00:00

savanni deleted branch st7789-drawing

2025-03-05 15:01:03 +00:00

Sign in to join this conversation.