protected IBinaryStream OpenAsBitmap(IBinaryStream input)
{
var header = new byte[2] {
(byte)'B', (byte)'M'
};
Stream stream = new StreamRegion(input.AsStream, 2, true);
stream = new PrefixStream(header, stream);
return(new BinaryStream(stream, input.Name));
}
public override ImageData Read(IBinaryStream file, ImageMetaData info)
{
var meta = (MngMetaData)info;
var body = new StreamRegion(file.AsStream, meta.PngOffset, true);
using (var png = new PrefixStream(PngFormat.HeaderBytes, body))
{
var decoder = new PngBitmapDecoder(png, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
var frame = decoder.Frames[0];
frame.Freeze();
return(new ImageData(frame, info));
}
}
public MngFrameDecoder(IBinaryStream input)
{
var png = new PrefixStream(PngFormat.HeaderBytes, input.AsStream);
m_input = new BinaryStream(png, input.Name);
try
{
Info = ImageFormat.Png.ReadMetaData(m_input);
if (null == Info)
{
throw new InvalidFormatException();
}
}
catch
{
m_input.Dispose();
throw;
}
}
