public bool ReadHeader()
{
this._Codec?.Dispose();
this._DecompressionParameters?.Dispose();
this._Image?.Dispose();
this._Codec = null;
this._DecompressionParameters = null;
this._Image = null;
// ToDo: Support to change format?
this._Codec = OpenJpeg.CreateDecompress(CodecFormat.J2k);
//this._Codec = OpenJpeg.CreateDecompress(CodecFormat.Jp2);
this._DecompressionParameters = new DecompressionParameters();
OpenJpeg.SetDefaultDecoderParameters(this._DecompressionParameters);
if (!OpenJpeg.SetupDecoder(this._Codec, this._DecompressionParameters))
{
return(false);
}
if (!OpenJpeg.ReadHeader(this._Stream, this._Codec, out var image))
{
return(false);
}
this.Width = (int)(image.X1 - image.X0);
this.Height = (int)(image.Y1 - image.Y0);
this._Image = image;
return(true);
}
public void Decode()
{
var targets = new[]
{
//new { Name = "Bretagne1_0.j2k", IsReadStream = true, Format = CodecFormat.Unknown, Result = false },
new { Name = "Bretagne1_0.j2k", IsReadStream = true, Format = CodecFormat.J2k, Result = true },
//new { Name = "Bretagne1_0.j2k", IsReadStream = true, Format = CodecFormat.Jp2, Result = false },
//new { Name = "Bretagne1_0.j2k", IsReadStream = true, Format = CodecFormat.Jpp, Result = false },
//new { Name = "Bretagne1_0.j2k", IsReadStream = true, Format = CodecFormat.Jpt, Result = false },
//new { Name = "Bretagne1_0.j2k", IsReadStream = true, Format = CodecFormat.Jpx, Result = false }
};
foreach (var target in targets)
{
var path = Path.GetFullPath(Path.Combine(TestImageDirectory, target.Name));
var stream = OpenJpeg.StreamCreateDefaultFileStream(path, target.IsReadStream);
var codec = OpenJpeg.CreateDecompress(target.Format);
var decompressionParameters = new DecompressionParameters();
OpenJpeg.SetDefaultDecoderParameters(decompressionParameters);
Assert.True(OpenJpeg.SetupDecoder(codec, decompressionParameters) == target.Result, $"Failed to invoke {nameof(OpenJpeg.SetupDecoder)} for {target.Format} and {target.IsReadStream}");
Assert.True(OpenJpeg.ReadHeader(stream, codec, out var image) == target.Result, $"Failed to invoke {nameof(OpenJpeg.ReadHeader)} for {target.Format} and {target.IsReadStream}");
Assert.True(OpenJpeg.SetDecodeArea(codec, image, 0, 0, 0, 0) == target.Result, $"Failed to invoke {nameof(OpenJpeg.SetDecodeArea)} for {target.Format} and {target.IsReadStream}");
Assert.True(OpenJpeg.Decode(codec, stream, image) == target.Result, $"Failed to invoke {nameof(OpenJpeg.Decode)} for {target.Format} and {target.IsReadStream}");
Assert.True(OpenJpeg.EndDecompress(codec, stream) == target.Result, $"Failed to invoke {nameof(OpenJpeg.EndDecompress)} for {target.Format} and {target.IsReadStream}");
this.DisposeAndCheckDisposedState(image);
this.DisposeAndCheckDisposedState(stream);
this.DisposeAndCheckDisposedState(decompressionParameters);
this.DisposeAndCheckDisposedState(codec);
}
}
private static Image DecodeImageFromFile(string path, CodecFormat format)
{
using var stream = OpenJpeg.StreamCreateDefaultFileStream(path, true);
using var codec = OpenJpeg.CreateDecompress(format);
using var decompressionParameters = new DecompressionParameters();
OpenJpeg.SetDefaultDecoderParameters(decompressionParameters);
OpenJpeg.SetupDecoder(codec, decompressionParameters);
OpenJpeg.ReadHeader(stream, codec, out var image);
OpenJpeg.SetDecodeArea(codec, image, 0, 0, 0, 0);
OpenJpeg.Decode(codec, stream, image);
OpenJpeg.EndDecompress(codec, stream);
return(image);
}
