search

ThingPulse / esp8266-oled-ssd1306

Driver for the SSD1306 and SH1106 based 128x64, 128x32, 64x48 pixel OLED display running on ESP8266/ESP32
https://thingpulse.com
Other
2.01k stars 638 forks source link

How to draw curillic or utf 8 #343

Closed lancer-1 closed 3 years ago

lancer-1 commented 3 years ago

is there support for utf-8 text printing and where i can take cyrillic fonts?

marcelstoer commented 3 years ago

@lorol didn't you play with Cyrillic fonts in your fork?

marcelstoer commented 3 years ago

In #341 @Shdwdrgn presented a new font editor. Maybe a way forward would be to start supporting Cyrillic fonts in the various font editors.

Shdwdrgn commented 3 years ago

From what I've seen, the format of the font files do support more than the base 255 characters so we could technically build a file with as many characters as desired. I think the real issue is that there's no way to compress the unused characters, so each character will always use a minimum of 4 bytes. If you're trying to support a full 16-bit character range then you'll be using a minimum of 256k of storage just for a single font (not including the font definitions themselves). Any efforts to use the upper range need to begin with a way to reduce this to a manageable size.

On the other hand if you can work within the 255 characters of the ANSI set then there shouldn't be any problem. Since I'm not really clear on what constitutes Cyrillic fonts outside of the ANSI set I don't know if this helps.

lancer-1 commented 3 years ago

@Shdwdrgn thanks a lot! But needed cyrillic symbols are in range 1 to 1111 and its not a problem to use all this, so i think i can rewrite draw function to get more, or not?

lorol commented 3 years ago

@lorol didn't you play with Cyrillic fonts in your fork?

Yes I did. Let me check if what I can retrieve. I was long ago.

lorol commented 3 years ago

https://github.com/lorol/esp8266-oled-ssd1306 It is basically a font header w/ non-ascii letters added, small tweak in OLEDDisplay.cpp code, on the sketch - call utf8ascii() and use UTF-8 on your C source code files so you can write directly the non-ascii strings in it. https://github.com/lorol/esp8266-oled-ssd1306/blob/master/resources/Cyr.jpg

lancer-1 commented 3 years ago

@lorol Thanks a lot!

marcelstoer commented 3 years ago

@lorol thanks, a PR would be cool we I totally understand if you do not get around to it.