void LoadThread()
{
using (var pool = new MonoTouch.Foundation.NSAutoreleasePool()) {
while (_continueWorkingInBackground)
{
TileCollectionItem q = null;
lock (_loadingTiles) {
q = _loadingTiles.GetHighestPriority();
}
if (q == null)
{
_wakeupLoader.WaitOne(TimeSpan.FromSeconds(5));
}
else
{
var req = q.Name;
try {
var filename = GetTilePath(req);
using (var image = UIImage.FromFileUncached(filename)) {
if (image != null)
{
var data = TextureData.FromUIImage(image);
lock (_loadedTiles) {
_loadedTiles[req] = data;
}
}
else
{
Console.WriteLine("! Failed to load " + req);
throw new Exception();
}
}
}
catch (Exception) {
//
// If there was an error loading the tile, then it
// must be bad. Redownload it.
//
lock (_onDiskTiles) {
_onDiskTiles.Remove(req);
}
}
finally {
lock (_loadingTiles) {
_loadingTiles.Remove(req);
}
}
}
}
}
}
public TileCollectionItem GetHighestPriority()
{
TileCollectionItem tile = null;
foreach (var t in _tiles.Values)
{
if (tile == null || t.Priority < tile.Priority)
{
tile = t;
}
}
return(tile);
}
public T this[TileName name] {
get {
TileCollectionItem t = null;
if (_tiles.TryGetValue(GetId(name), out t))
{
t.Priority = _nextPriority++;
return((T)t.Value);
}
else
{
return(default(T));
}
}
set {
var t = new TileCollectionItem()
{
Priority = _nextPriority++,
Name = name.Clone(),
Value = value
};
_tiles[GetId(name)] = t;
}
}
