Feature Request: Printing images to maps

[Techokami]

Quite simply, having a means of taking a blank map, sticking it into the paper tray of a printer, and using a computer to print a 128x128 pixel-sized color image to said blank map would be amazing. We can then hang the picture on a wall with an Item Frame! This is something the original printer mod for ComputerCraft did, before dan200 added official printers.

[CaitlynMainer]

Sure, PR that and I'd love to add it. :p
Really though I've wanted to do this, I just have no idea where to start..

[Techokami]

I got no idea where to start, either, hence why I put this here XD

[AfterLifeLochie]

As far as I'm aware with this, you have to give the player a filled_map item with a map ID. In the world's data directory you'll have to check the idcounts.dat for the next map unique number. idcounts.dat is an uncompressed NBT file which only contains a map tag which has the latest Map ID.

The map_[id].dat format is relatively simple and is a compressed NBT blob. It contains a data tag which has the scale, the dimension the map belongs to, the width and height, the x and z centre coordinates and the color array which represents the actual pixels (ie, 16384 if it's a 128x128 map).

It's also worth noting that, as far as I'm aware, the color data array isn't an rgb(a) array, it's actually a custom color palette with a set of limited colors, so you'll either have to shed image quality or limit the colors which can be printed in the first place.