/// <summary>
/// Create image from stream. Pfim will try to detect the format based on several leading bytes
/// </summary>
public static IImage FromStream(Stream stream, PfimConfig config)
{
byte[] magic = new byte[4];
if (stream.Read(magic, 0, 4) != 4)
{
throw new ArgumentException("stream must contain magic header", nameof(stream));
}
if (magic[0] == 0x44 && magic[1] == 0x44 && magic[2] == 0x53 && magic[3] == 0x20)
{
return(Dds.CreateSkipMagic(stream, config));
}
return(Targa.CreateWithPartialHeader(stream, config, magic));
}
private static Targa DecodeTarga(Stream str, PfimConfig config, TargaHeader header)
{
var targa = (header.IsCompressed)
? (IDecodeTarga)(new CompressedTarga())
: new UncompressedTarga();
byte[] data;
switch (header.Orientation)
{
case TargaHeader.TargaOrientation.BottomLeft:
data = targa.BottomLeft(str, header, config);
break;
case TargaHeader.TargaOrientation.BottomRight:
data = targa.BottomRight(str, header, config);
break;
case TargaHeader.TargaOrientation.TopRight:
data = targa.TopRight(str, header, config);
break;
case TargaHeader.TargaOrientation.TopLeft:
data = targa.TopLeft(str, header, config);
break;
default:
throw new Exception("Targa orientation not recognized");
}
var stride = Util.Stride(header.Width, header.PixelDepthBits);
var len = header.Height * stride;
var result = new Targa(header, config, data, len);
if (config.ApplyColorMap)
{
result.ApplyColorMap();
}
return(result);
}