/// <summary>
/// Set the raw image data to solid white
/// </summary>
public void AllocateEmptyImage()
{
RawImageData = RawDataPool.Capture();
for (int i = 0; i < ByteSize; i++)
{
RawImageData[i] = 255;
}
State = TileState.Empty;
}
private void WriteTileToBackingStoreSync(PositionKey key, CachedTile tile)
{
if (key == null)
{
return;
}
if (tile == null)
{
return;
}
if (tile.State == TileState.Locked)
{
return;
}
var red = RawDataPool.Capture();
var green = RawDataPool.Capture();
var blue = RawDataPool.Capture();
try
{
var name = key.ToString();
if (tile.ImageIsBlank())
{
_tileStore.Delete(name, "img");
tile.SetState(TileState.Empty);
}
else
{
var packed = tile.GetTileData();
if (packed == null)
{
return;
}
var end = TileImageSize * TileImageSize;
for (int i = 0; i < end; i++)
{
blue[i] = packed[4 * i + 0];
green[i] = packed[4 * i + 1];
red[i] = packed[4 * i + 2];
}
using (var ms = new MemoryStream())
{
WaveletCompress.Compress(red, green, blue, tile.Width, tile.Height).WriteToStream(ms);
ms.Seek(0, SeekOrigin.Begin);
var ok = _tileStore.Store(name, "img", ms);
if (ok.IsFailure)
{
throw new Exception("Storage error: DB might be corrupt.", ok.FailureCause);
}
}
}
}
finally
{
RawDataPool.Release(red);
RawDataPool.Release(green);
RawDataPool.Release(blue);
}
}
private void LoadTileDataSync(PositionKey key, ICachedTile tile)
{
var red = RawDataPool.Capture();
var green = RawDataPool.Capture();
var blue = RawDataPool.Capture();
try
{
if (key == null || tile == null)
{
return;
}
var name = key.ToString();
var res = _tileStore.Exists(name);
if (res.IsFailure)
{
tile.SetState(TileState.Empty);
return;
}
var version = res.ResultData?.CurrentVersion ?? 1;
var img = _tileStore.Read(name, "img", version);
if (img.IsFailure || img.ResultData == null)
{
tile.SetState(TileState.Empty);
return;
}
var fileData = InterleavedFile.ReadFromStream(img.ResultData);
if (fileData != null)
{
WaveletCompress.Decompress(fileData, red, green, blue, 1);
}
tile.EnsureDataReady();
var packed = tile.GetTileData() ?? throw new Exception("Byte pool allocation failed");
var end = TileImageSize * TileImageSize;
for (int i = 0; i < end; i++)
{
packed[4 * i + 0] = blue[i];
packed[4 * i + 1] = green[i];
packed[4 * i + 2] = red[i];
if (blue[i] >= 254 && green[i] >= 254 && red[i] >= 254)
{
packed[4 * i + 3] = 0;
}
else
{
packed[4 * i + 3] = 255;
}
}
tile.SetState(TileState.Ready);
}
catch (Exception ex)
{
Logging.WriteLogMessage("Failed to load tile data\r\n" + ex);
tile?.MarkCorrupted();
}
finally {
RawDataPool.Release(red);
RawDataPool.Release(green);
RawDataPool.Release(blue);
}
}
/// <summary>
/// Remove the cache, and set state to empty
/// </summary>
public void Deallocate()
{
State = TileState.Empty;
RawDataPool.Release(RawImageData);
RawImageData = null;
}