/// <summary> /// gets image from tile server /// </summary> /// <param name="provider"></param> /// <param name="pos"></param> /// <param name="zoom"></param> /// <returns></returns> public PureImage GetImageFrom(IMapProvider provider, GPoint pos, int zoom, out Exception result) { PureImage ret = null; result = null; try { var rtile = new RawTile(provider.MapId, pos, zoom); // let't check memmory first if (UseMemoryCache) { var m = MemoryCache.GetTileFromMemoryCache(rtile); if (m != null) { if (IMapProvider.TileImageProxy != null) { ret = IMapProvider.TileImageProxy.FromArray(m); if (ret == null) { #if DEBUG Debug.WriteLine("Image disposed in MemoryCache o.O, should never happen ;} " + new RawTile(provider.MapId, pos, zoom)); if (Debugger.IsAttached) { Debugger.Break(); } #endif m = null; } } } } if (ret == null) { if (Mode != AccessMode.ServerOnly) { if (PrimaryCache != null) { // hold writer for 5s if (CacheOnIdleRead) { Interlocked.Exchange(ref readingCache, 5); } ret = PrimaryCache.GetImageFromCache(provider.MapId, pos, zoom); if (ret != null) { if (UseMemoryCache) { MemoryCache.AddTileToMemoryCache(rtile, ret.Data.GetBuffer()); } return(ret); } } } if (Mode != AccessMode.CacheOnly) { ret = provider.GetTileImage(pos, zoom); { // Enqueue Cache if (ret != null) { if (UseMemoryCache) { MemoryCache.AddTileToMemoryCache(rtile, ret.Data.GetBuffer()); } if (Mode != AccessMode.ServerOnly) { EnqueueCacheTask(new CacheQueueItem(rtile, ret.Data.GetBuffer(), CacheUsage.Both)); } } } } else { result = noDataException; } } } catch (Exception ex) { result = ex; ret = null; Debug.WriteLine("GetImageFrom: " + ex.ToString()); } return(ret); }
abstract public bool Save(Stream stream, PureImage image);