Hi to all! I am trying to make a OpenStreetMap client, OSM servers allow to download a png images of 256 x 256 px, well I want to concatenate a at least 9 of this images in a big png only in memory, only for the view, I dont want to save, and then make zoom and move in the view.

I have two questions:

How to concatenate in memory a collection of png in 2 dimensions?

For show a part of the image witch tecnology use, Canvas?

Thanks to all!