public WsaTile(Stream s, Size size, ISpriteFrame prev)
{
Size = size;
var dataLen = s.Length - s.Position;
Console.WriteLine("dataLen = {0}", dataLen);
var tempData = StreamExts.ReadBytes(s, (int)dataLen);
byte[] srcData = new byte[size.Width * size.Height];
// format80 decompression
LCWCompression.DecodeInto(tempData, srcData);
// and format40 decmporession
Data = new byte[size.Width * size.Height];
if (prev == null)
{
Array.Clear(Data, 0, Data.Length);
}
else
{
Array.Copy(prev.Data, Data, Data.Length);
}
XORDeltaCompression.DecodeInto(srcData, Data, 0);
}
/// <summary>
///
/// </summary>
/// <param name="h"></param>
void Decompress(ImageHeader h)
{
if (h.Size.Width == 0 || h.Size.Height == 0)
{
return;
}
if (recurseDepth > imageCount)
{
throw new InvalidOperationException("Format20/40 headers contain infinite loop");
}
switch (h.Format)
{
case Format.XORPrev:
case Format.XORLCW:
if (h.RefImage.Data == null)
{
++recurseDepth;
Decompress(h.RefImage);
--recurseDepth;
}
h.Data = CopyImageData(h.RefImage.Data);
XORDeltaCompression.DecodeInto(shpBytes, h.Data, (int)(h.FileOffset - shpBytesFileOffset));
break;
case Format.LCW:
var imageBytes = new byte[Size.Width * Size.Height];
LCWCompression.DecodeInto(shpBytes, imageBytes, (int)(h.FileOffset - shpBytesFileOffset));
h.Data = imageBytes;
break;
default:
throw new InvalidDataException();
}
}
void Decompress(ImageHeader h)
{
// No extra work is required for empty frames
if (h.Size.Width == 0 || h.Size.Height == 0)
return;
if (recurseDepth > imageCount)
throw new InvalidDataException("Format20/40 headers contain infinite loop");
switch (h.Format)
{
case Format.XORPrev:
case Format.XORLCW:
{
if (h.RefImage.Data == null)
{
++recurseDepth;
Decompress(h.RefImage);
--recurseDepth;
}
h.Data = CopyImageData(h.RefImage.Data);
XORDeltaCompression.DecodeInto(shpBytes, h.Data, (int)(h.FileOffset - shpBytesFileOffset));
break;
}
case Format.LCW:
{
var imageBytes = new byte[Size.Width * Size.Height];
LCWCompression.DecodeInto(shpBytes, imageBytes, (int)(h.FileOffset - shpBytesFileOffset));
h.Data = imageBytes;
break;
}
default:
throw new InvalidDataException();
}
}