public void Enqueue(int bandNo, LevelId level)
{
string key = _cacheNameHelper.GetResourceKey(bandNo, level.No);
if (_readFileStreams.ContainsKey(key))
{
return;
}
BandLevelTask task = new BandLevelTask();
task.BandNo = bandNo;
task.Level = level;
_bandLevelQueue.Enqueue(task);
}
private unsafe void DoBandLevelTask(BandLevelTask bandLevelTask)
{
_isDoingLargerTask = true;
try
{
string fname = _cacheNameHelper.GetCacheFilename(_cacheFolder, bandLevelTask.BandNo, bandLevelTask.Level.No);
using (FileStream fs = new FileStream(fname, FileMode.Create, FileAccess.ReadWrite, FileShare.Read))
{
using (BinaryWriter bw = new BinaryWriter(fs))
{
IRasterBand band = _dataProvider.GetRasterBand(bandLevelTask.BandNo);
int tCount = bandLevelTask.Level.Tiles.Length;
TileId[] tiles = bandLevelTask.Level.Tiles;
TileId tile;
LevelId lv = bandLevelTask.Level;
byte[] data = new byte[_tileBufferSize];
fixed(byte *ptr = data)
{
IntPtr buffer = new IntPtr(ptr);
for (int i = 0; i < tCount; i++)
{
tile = tiles[i];
band.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);
bw.Write(data);
//
if (_needPauseLargerTask)
{
Console.WriteLine("需要暂停长任务。");
_needPauseLargerTask = false;
}
}
}
}
}
}
finally
{
_isDoingLargerTask = false;
}
}
void Application_Idle(object sender, EventArgs e)
{
//return;
if (_bandLevelQueue.Count > 0)
{
BandLevelTask task = _bandLevelQueue.Dequeue();
task.FileName = _cacheNameHelper.GetCacheFilename(_cacheFolder, task.BandNo, task.Level.No);
//将任务插入到读取栈
_taskStack.Push(task);
}
else
{
if (_workerIsFinisehd)
{
_isStarted = false;
Start();
}
}
}