private static ImageSource CreateImage(TileSource tileSource, Tile tile)
{
ImageSource image = null;
try
{
image = BitmapFrame.Create(tileSource.GetUri(tile.XIndex, tile.Y, tile.ZoomLevel));
}
catch (Exception ex)
{
Trace.TraceWarning("Creating tile image failed: {0}", ex.Message);
}
return(image);
}
private void LoadPendingTiles(Dispatcher dispatcher, TileSource tileSource, string sourceName, bool animateOpacity)
{
var setImageAction = new Action <Tile, ImageSource>((t, i) => t.SetImageSource(i, animateOpacity));
var imageTileSource = tileSource as ImageTileSource;
Tile tile;
while (pendingTiles.TryDequeue(out tile))
{
byte[] buffer = null;
ImageSource image = null;
if (imageTileSource != null)
{
image = LoadImage(imageTileSource, tile);
}
else
{
var uri = tileSource.GetUri(tile.XIndex, tile.Y, tile.ZoomLevel);
if (uri != null)
{
if (uri.Scheme == "file") // create from FileStream as creating from URI leaves the file open
{
image = CreateImage(uri.AbsolutePath);
}
else
{
buffer = DownloadImage(uri);
image = CreateImage(buffer);
}
}
}
if (image != null || !tile.HasImageSource) // do not set null if tile already has an image (from cache)
{
dispatcher.BeginInvoke(setImageAction, DispatcherPriority.Render, tile, image);
}
if (buffer != null && image != null)
{
Cache.Set(GetCacheKey(sourceName, tile), buffer, new CacheItemPolicy {
SlidingExpiration = CacheExpiration
});
}
}
Interlocked.Decrement(ref threadCount);
}
