Renders one tile from the page's cached display list and presents it to surface on the awaiting context. A
render cancelled by its token or by closing the session never reaches the surface.
public Task RenderTileAsync(Tile tile, IRenderSurface surface, CancellationToken cancellationToken = default(CancellationToken))
The tile.
Where the finished pixels go.
Stops the render.
ISO 32000-2 §8.3.2.2 and §10.7.1. Spec #33 viewer capabilities 1 and 2.