Surface is responsible for managing the pixels that a canvas draws into. The pixels can be
allocated either in CPU memory (a raster surface) or on the GPU (a
RenderTarget surface).
Surface takes care of allocating a
Canvas that will draw into the surface. Call
surface_get_canvas() to use that canvas (but don’t delete it, it is owned by the surface).
Surface always has non-zero dimensions. If there is a request for a new surface, and either
of the requested dimensions are zero, then
None will be returned.