Announcing a OSM map downloader based on LovyanGFX

[CelliesProjects]

@lovyan03 @tobozo Thanks for the excellent library!

Just came here to plug and get feedback on my OpenStreetMap map dowload library, based on lovyanGFX sprites.
You can find it at https://github.com/CelliesProjects/OpenStreetMap-esp32.

Working quite nicely already and I would like some feedback on what people think of it and if it is a bit useable in its current state.

[tobozo]

hi,

The code is very well written and surprisingly small, well done!

I'm too far from my gizmos to do any hardware test, but I was wondering how this would run on an esp32-wroom (e.g. M5Stack classic without psram).

⚠ the mapsprite creation isn't checked for success.

Idea: fallback to rbg332 when sprite creation fails with rgb565.

    mapSprite.setColorDepth(lgfx::rgb565_2Byte);

    if( !mapSprite.createSprite(mapWidth, mapHeight) ) {

        mapSprite.setColorDepth(lgfx::rgb332);

        if( !mapSprite.createSprite(mapWidth, mapHeight) ) 
            return false;

    }

[CelliesProjects]

Running this on a esp32 without psram would be a real challenge. Could probably be done.

A single tile is 128kB decoded and around 35kB to download.

The current code just allocates that 35kB which by itself could already be a challenge on real world code without psram.

[CelliesProjects]

⚠ the mapsprite creation isn't checked for success.

It is now