private ImageData ReadJpeg(Stream file, SpdMetaData info)
{
file.Position = 0x18;
var header = new byte[0x3C];
if (header.Length != file.Read(header, 0, header.Length))
{
throw new EndOfStreamException();
}
unsafe
{
fixed(byte *raw = header)
{
uint *dw = (uint *)raw;
for (int i = 0; i < 0xF; ++i)
{
dw[i] += 0xA8961EF1;
}
}
}
using (var rest = new StreamRegion(file, file.Position, true))
using (var jpeg = new PrefixStream(header, rest))
{
var decoder = new JpegBitmapDecoder(jpeg,
BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
var frame = decoder.Frames[0];
frame.Freeze();
return(new ImageData(frame, info));
}
}
public SpdReader(Stream input, SpdMetaData info)
{
m_input = input;
m_output = new byte[info.UnpackedSize];
m_info = info;
if (24 == info.BPP)
{
Format = PixelFormats.Bgr24;
}
else if (32 == info.BPP)
{
Format = PixelFormats.Bgra32;
}
else
{
throw new NotSupportedException("Not supported SPD image bitdepth");
}
}