private unsafe void CheckIsNeedAsyncNotify(int bandNo, TileId tile, byte[] data)
{
string key = GetTileTaskKey(bandNo, tile);
if (_needAsyncNotifyTasks.Contains(key))
{
TileData tileData = new TileData();
tileData.BandNo = bandNo;
tileData.Tile = tile;
tileData.Data = new byte[data.Length];
fixed(byte *srcptr = data, dstptr = (byte[])tileData.Data)
{
IntPtr src = new IntPtr(srcptr);
IntPtr dst = new IntPtr(dstptr);
WinAPI.MemoryCopy(src, dst, data.Length);
}
if (_tileReadedCallback != null)
{
_tileReadedCallback.BeginInvoke(tileData, null, null);
}
_needAsyncNotifyTasks.Remove(key);
}
}
private bool TileIsEixst(TileId tile)
{
Dictionary <int, TileData> levelCache = null;
if (!_cache.ContainsKey(tile.LevelNo))
{
levelCache = new Dictionary <int, TileData>();
_cache.Add(tile.LevelNo, levelCache);
}
return(_cache[tile.LevelNo].ContainsKey(tile.Index));
}
public TileData[] GetTiles(int levelNo, Rectangle rasterEnvelope)
{
if (levelNo > _tileComputer.Levels.Length - 1)
{
return(null);
}
TileId[] visibleTiles = GetVisibileTiles(levelNo, rasterEnvelope);
//如果本级没有缓存,则向上找分辨率较粗的一级代替
if (!_cache.ContainsKey(levelNo))
{
//通知异步读取线程优先读取
for (int i = 0; i < visibleTiles.Length; i++)
{
TileId tile = visibleTiles[i];
_requestAgent.DoRequest(_bandNo, tile);
}
//找分辨率较粗的一级代替
GetTiles(levelNo++, rasterEnvelope);
}
LevelId lv = _tileComputer.Levels[levelNo];
Dictionary <int, TileData> lvTiles = _cache[levelNo];
List <TileData> retTiles = new List <TileData>();
int idx = 0;
for (int i = 0; i < visibleTiles.Length; i++)
{
TileId tile = visibleTiles[i];
if (lvTiles.ContainsKey(tile.Index))
{
retTiles.Add(lvTiles[tile.Index]);
}
else//如果该块不在内存,则通知异步获取,向上查找较粗分辨率的一层代替
{
TileData data = ToUpperLevel(lv.No, tile.Row, tile.Col);
if (data != null)
{
retTiles.Add(data);
}
_requestAgent.DoRequest(_bandNo, _tileComputer.Levels[lv.No].Tiles[idx]);
}
}
return(retTiles.Count > 0 ? retTiles.ToArray() : null);
}
private int GetTileCount(ref LevelId lv, out TileId[] tiles)
{
int rows = (int)Math.Ceiling(lv.Height / (float)_tileSize);
int cols = (int)Math.Ceiling(lv.Width / (float)_tileSize);
tiles = new TileId[rows * cols];
lv.Rows = rows;
lv.Cols = cols;
for (int r = 0; r < rows; r++)
{
for (int c = 0; c < cols; c++)
{
TileId tile = new TileId();
tile.LevelNo = lv.No;
if (c == cols - 1)
{
tile.Width = Math.Min(_tileSize, lv.Width - (cols - 1) * _tileSize);
}
else
{
tile.Width = _tileSize;
}
if (r == rows - 1)
{
tile.Height = Math.Min(_tileSize, lv.Height - (rows - 1) * _tileSize);
}
else
{
tile.Height = _tileSize;
}
tile.Row = r;
tile.Col = c;
tile.Index = r * cols + c;
tiles[tile.Index] = tile;
}
}
return(rows * cols);
}
public void Update(int levelNo, Rectangle rasterEnvelopeOfWnd, Rectangle rasterEnvelopeOfVirtualWnd)
{
LevelId lv = _tileComputer.Levels[levelNo];
TileId[] visibleTiles = GetVisibileTiles(levelNo, rasterEnvelopeOfVirtualWnd);
//通知异步读取线程优先读取(这里还可以优化)
Console.WriteLine("---------------- bandNo " + _bandNo.ToString() + "--------------------");
if (visibleTiles != null)
{
for (int i = 0; i < visibleTiles.Length; i++)
{
TileId tile = visibleTiles[i];
if (!TileIsEixst(tile))
{
_requestAgent.DoRequest(_bandNo, tile);
Console.WriteLine("Request: " + tile.ToString());
}
else
{
Console.WriteLine("In Memeory: " + tile.ToString());
}
}
}
}
private unsafe void DirectTileFromDataProvider(TileTask tileTask)
{
byte[] data = new byte[_tileBufferSize];
fixed(byte *ptr = data)
{
IntPtr buffer = new IntPtr(ptr);
TileId tile = tileTask.Tile;
LevelId lv = _tileComputer.Levels[tile.LevelNo];
_dataProvider.GetRasterBand(tileTask.BandNo).Read(
(int)(_tileSize * tile.Col / lv.Scale),
(int)(_tileSize * tile.Row / lv.Scale),
(int)(tile.Width / lv.Scale),
(int)(tile.Height / lv.Scale),
buffer, _dataProvider.DataType, tile.Width, tile.Height);
//
TileData tileData = new TileData();
tileData.BandNo = tileTask.BandNo;
tileData.Tile = tile;
tileData.Data = data;
_tileReadedCallback(tileData);
}
}
private void RequestTileHandlerFuc(int bandNo, TileId tile)
{
_diskCacheManager.Request(bandNo, new TileId[] { tile });
}
public void DoRequest(int bandNo, TileId tile)
{
_requestTileHandler.BeginInvoke(bandNo, tile, null, null);
}
private string GetTileTaskKey(int bandNo, TileId tile)
{
return(string.Format("{0}_{1}_{2}_{3}", bandNo, tile.LevelNo, tile.Row, tile.Col));
}
