public override void GetTile(TileId tileId, out TileRenderable tileRenderable, out bool tileWillNeverBeAvailable)
{
if (!relevantTileSet.Contains(tileId))
{
throw new InvalidOperationException("Cannot get a tile that is not currently set as relevant.");
}
tileRenderable = null;
tileWillNeverBeAvailable = false;
var rasterTileCacheValue = rasterTileImageCache.GetValue(tileId);
if (rasterTileCacheValue is null)
{
return;
}
if (rasterTileCacheValue.Image is null)
{
tileWillNeverBeAvailable = true;
}
else
{
if (tileRenderables.TryGetValue(tileId, out tileRenderable))
{
return;
}
var newToCache = DateTime.UtcNow.Subtract(rasterTileCacheValue.TimeAdded).TotalMilliseconds < 500.0;
tileRenderable = CreateTileRenderable(tileId, rasterTileCacheValue.Image, rasterTileCacheValue.TileSubregion, newToCache);
tileRenderables.Add(tileId, tileRenderable);
}
}
public abstract void GetTile(
TileId tileId,
out TileRenderable tileRenderable,
out bool tileWillNeverBeAvailable);
