private static Task LoadTile(Tile tile, TileSource tileSource, string cacheName)
{
if (string.IsNullOrEmpty(cacheName))
{
return(LoadTile(tile, tileSource));
}
var uri = tileSource.GetUri(tile.XIndex, tile.Y, tile.ZoomLevel);
if (uri != null)
{
var extension = Path.GetExtension(uri.LocalPath);
if (string.IsNullOrEmpty(extension) || extension == ".jpeg")
{
extension = ".jpg";
}
var cacheKey = string.Format(CultureInfo.InvariantCulture,
"{0}/{1}/{2}/{3}{4}", cacheName, tile.ZoomLevel, tile.XIndex, tile.Y, extension);
return(LoadCachedTile(tile, uri, cacheKey));
}
return(Task.CompletedTask);
}
private async Task LoadPendingTilesAsync(TileSource tileSource, string sourceName)
{
Tile tile;
while (pendingTiles.TryPop(out tile))
{
tile.Pending = false;
try
{
var uri = tileSource.GetUri(tile.XIndex, tile.Y, tile.ZoomLevel);
if (uri != null)
{
var extension = Path.GetExtension(uri.LocalPath);
if (string.IsNullOrEmpty(extension) || extension == ".jpeg")
{
extension = ".jpg";
}
var cacheKey = string.Format(CacheKeyFormat, sourceName, tile.ZoomLevel, tile.XIndex, tile.Y, extension);
await LoadTileImageAsync(tile, uri, cacheKey);
}
}
catch (Exception ex)
{
Debug.WriteLine("TileImageLoader: {0}/{1}/{2}: {3}", tile.ZoomLevel, tile.XIndex, tile.Y, ex.Message);
}
}
}
private async Task LoadTileImageAsync(Tile tile, TileSource tileSource, string sourceName)
{
if (tileSource != null)
{
if (Cache != null &&
tileSource.UriFormat != null &&
tileSource.UriFormat.StartsWith("http") &&
!string.IsNullOrEmpty(sourceName))
{
var uri = tileSource.GetUri(tile.XIndex, tile.Y, tile.ZoomLevel);
if (uri != null)
{
var extension = Path.GetExtension(uri.LocalPath);
if (string.IsNullOrEmpty(extension) || extension == ".jpeg")
{
extension = ".jpg";
}
var cacheKey = string.Format(CacheKeyFormat, sourceName, tile.ZoomLevel, tile.XIndex, tile.Y, extension);
await LoadCachedTileImageAsync(tile, uri, cacheKey).ConfigureAwait(false);
}
}
else
{
await LoadTileImageAsync(tile, tileSource).ConfigureAwait(false);
}
}
}
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 because creating from URI leaves the file open
{
image = CreateImage(uri.LocalPath);
}
else
{
buffer = DownloadImage(uri);
image = CreateImage(buffer);
}
}
}
if (image != null || !tile.HasImageSource) // set null image if tile does not yet have an ImageSource
{
dispatcher.BeginInvoke(setImageAction, tile, image);
}
if (image != null && buffer != null && Cache != null && !string.IsNullOrWhiteSpace(sourceName))
{
Cache.Set(TileCache.Key(sourceName, tile), buffer, new CacheItemPolicy {
SlidingExpiration = CacheExpiration
});
}
}
Interlocked.Decrement(ref threadCount);
}
private void LoadPendingTiles(Dispatcher dispatcher, TileSource tileSource, string sourceName)
{
var imageTileSource = tileSource as ImageTileSource;
PendingTile pendingTile;
while (pendingTiles.TryDequeue(out pendingTile))
{
var tile = pendingTile.Tile;
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.IsAbsoluteUri)
{
image = LoadImage(uri.OriginalString);
}
else if (uri.Scheme == "file")
{
image = LoadImage(uri.LocalPath);
}
else
{
image = DownloadImage(uri, CacheKey(sourceName, tile))
?? pendingTile.CachedImage; // use possibly cached image if download failed
}
}
}
if (image != null)
{
dispatcher.BeginInvoke(new Action <Tile, ImageSource>((t, i) => t.SetImage(i)), tile, image);
}
else
{
tile.SetImage(null);
}
}
Interlocked.Decrement(ref taskCount);
}
private async Task LoadCachedTileImageAsync(Tile tile, TileSource tileSource, string sourceName)
{
var uri = tileSource.GetUri(tile.XIndex, tile.Y, tile.ZoomLevel);
if (uri != null)
{
var extension = Path.GetExtension(uri.LocalPath);
if (string.IsNullOrEmpty(extension) || extension == ".jpeg")
{
extension = ".jpg";
}
var cacheKey = string.Format(CacheKeyFormat, sourceName, tile.ZoomLevel, tile.XIndex, tile.Y, extension);
await LoadCachedTileImageAsync(tile, uri, cacheKey);
}
}
private static async Task LoadCachedTileAsync(Tile tile, TileSource tileSource, string cacheName)
{
var uri = tileSource.GetUri(tile.XIndex, tile.Y, tile.ZoomLevel);
if (uri != null)
{
var extension = Path.GetExtension(uri.LocalPath);
if (string.IsNullOrEmpty(extension) || extension == ".jpeg")
{
extension = ".jpg";
}
var cacheKey = string.Format("{0}/{1}/{2}/{3}{4}", cacheName, tile.ZoomLevel, tile.XIndex, tile.Y, extension);
await LoadCachedTileAsync(tile, uri, cacheKey).ConfigureAwait(false);
}
}
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, tile.Rotation);
if (uri != null)
{
if (uri.Scheme == "file") // create from FileStream because creating from URI leaves the file open
{
image = CreateImage(uri.LocalPath);
}
else
{
buffer = DownloadImage(uri);
image = CreateImage(buffer);
}
}
}
if (image != null || !tile.HasImageSource) // set null image if tile does not yet have an ImageSource
{
dispatcher.BeginInvoke(setImageAction, tile, image);
}
if (image != null && buffer != null && Cache != null && !string.IsNullOrWhiteSpace(sourceName))
{
Cache.Set(TileCache.Key(sourceName, tile), buffer, new CacheItemPolicy { SlidingExpiration = CacheExpiration });
}
}
Interlocked.Decrement(ref threadCount);
}
private void LoadPendingTiles(Dispatcher dispatcher, TileSource tileSource, string sourceName)
{
var imageTileSource = tileSource as ImageTileSource;
PendingTile pendingTile;
while (pendingTiles.TryDequeue(out pendingTile))
{
var tile = pendingTile.Tile;
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.IsAbsoluteUri)
{
image = LoadImage(uri.OriginalString);
}
else if (uri.Scheme == "file")
{
image = LoadImage(uri.LocalPath);
}
else
{
image = DownloadImage(uri, CacheKey(sourceName, tile))
?? pendingTile.CachedImage; // use possibly cached image if download failed
}
}
}
if (image != null)
{
dispatcher.BeginInvoke(new Action<Tile, ImageSource>((t, i) => t.SetImage(i)), tile, image);
}
else
{
tile.SetImage(null);
}
}
Interlocked.Decrement(ref taskCount);
}