public async static Task <Action <byte[], PixelAccessor <Rgb888>, Rectangle> > GetImageDecoderAsync(TiffIfd ifd, Stream stream, ByteOrder byteOrder)
{
var photometricInterpretation = ifd.GetPhotometricInterpretation(byteOrder);
switch (photometricInterpretation)
{
case TiffPhotometricInterpretation.WhiteIsZero:
{
var bitsPerSample = await ifd.ReadBitsPerSampleAsync(stream, byteOrder);
if (bitsPerSample.Length >= 1 && bitsPerSample[0] == 8)
{
return((imageData, pixels, destination) => DecodeImageData_Grayscale_8(imageData, pixels, destination, true));
}
}
break;
case TiffPhotometricInterpretation.BlackIsZero:
{
var bitsPerSample = await ifd.ReadBitsPerSampleAsync(stream, byteOrder);
if (bitsPerSample.Length >= 1 && bitsPerSample[0] == 8)
{
return((imageData, pixels, destination) => DecodeImageData_Grayscale_8(imageData, pixels, destination, false));
}
}
break;
case TiffPhotometricInterpretation.Rgb:
{
var samplesPerPixel = (int)ifd.GetSamplesPerPixel(byteOrder);
var bitsPerSample = await ifd.ReadBitsPerSampleAsync(stream, byteOrder);
if (bitsPerSample.Length >= 3 && bitsPerSample[0] == 8 && bitsPerSample[1] == 8 && bitsPerSample[2] == 8)
{
if (samplesPerPixel == 3)
{
return((imageData, pixels, destination) => DecodeImageData_Rgb_888(imageData, pixels, destination));
}
else
{
return((imageData, pixels, destination) => DecodeImageData_Rgb_888_ExtraSamples(imageData, pixels, destination, samplesPerPixel));
}
}
}
break;
default:
throw new System.NotImplementedException();
}
throw new System.NotImplementedException();
}
