tree b36a37bf08f2461dbed16a03989368a72aa597c7
parent b92ca22a43e31fc249cae9c697c8a237927e3ae2
author Sylvain Becker <sylvain.becker@gmail.com> 1599497430 +0200
committer Sylvain Becker <sylvain.becker@gmail.com> 1599497430 +0200

SDL_Surface refcount: destination surface keep track of surfaces
that are mapped to it and automatically invalidate them when it is freed

- refcount is kept so that an external application can still create a reference
to SDL_Surface.

- lock_data was un-used and is now renamed and used as a list keep track of the blitmap