/// <summary>
/// Parses the given Exif profile to populate the properties of the tiff frame meta data.
/// </summary>
/// <param name="meta">The tiff frame meta data.</param>
/// <param name="profile">The Exif profile containing tiff frame directory tags.</param>
internal static void Parse(TiffFrameMetadata meta, ExifProfile profile)
{
if (profile != null)
{
if (TiffBitsPerSample.TryParse(profile.GetValue(ExifTag.BitsPerSample)?.Value, out TiffBitsPerSample bitsPerSample))
{
meta.BitsPerSample = bitsPerSample;
}
meta.BitsPerPixel = meta.BitsPerSample?.BitsPerPixel();
meta.Compression = (TiffCompression?)profile.GetValue(ExifTag.Compression)?.Value;
meta.PhotometricInterpretation = (TiffPhotometricInterpretation?)profile.GetValue(ExifTag.PhotometricInterpretation)?.Value;
meta.Predictor = (TiffPredictor?)profile.GetValue(ExifTag.Predictor)?.Value;
profile.RemoveValue(ExifTag.BitsPerSample);
profile.RemoveValue(ExifTag.Compression);
profile.RemoveValue(ExifTag.PhotometricInterpretation);
profile.RemoveValue(ExifTag.Predictor);
}
}
private static void ParseColorType(this TiffDecoderCore options, ExifProfile exifProfile)
{
switch (options.PhotometricInterpretation)
{
case TiffPhotometricInterpretation.WhiteIsZero:
{
if (options.BitsPerSample.Channels != 1)
{
TiffThrowHelper.ThrowNotSupported("The number of samples in the TIFF BitsPerSample entry is not supported.");
}
ushort bitsPerChannel = options.BitsPerSample.Channel0;
if (bitsPerChannel > 32)
{
TiffThrowHelper.ThrowNotSupported("Bits per sample is not supported.");
}
switch (bitsPerChannel)
{
case 32:
{
if (options.SampleFormat == TiffSampleFormat.Float)
{
options.ColorType = TiffColorType.WhiteIsZero32Float;
return;
}
options.ColorType = TiffColorType.WhiteIsZero32;
break;
}
case 24:
{
options.ColorType = TiffColorType.WhiteIsZero24;
break;
}
case 16:
{
options.ColorType = TiffColorType.WhiteIsZero16;
break;
}
case 8:
{
options.ColorType = TiffColorType.WhiteIsZero8;
break;
}
case 4:
{
options.ColorType = TiffColorType.WhiteIsZero4;
break;
}
case 1:
{
options.ColorType = TiffColorType.WhiteIsZero1;
break;
}
default:
{
options.ColorType = TiffColorType.WhiteIsZero;
break;
}
}
break;
}
case TiffPhotometricInterpretation.BlackIsZero:
{
if (options.BitsPerSample.Channels != 1)
{
TiffThrowHelper.ThrowNotSupported("The number of samples in the TIFF BitsPerSample entry is not supported.");
}
ushort bitsPerChannel = options.BitsPerSample.Channel0;
if (bitsPerChannel > 32)
{
TiffThrowHelper.ThrowNotSupported("Bits per sample is not supported.");
}
switch (bitsPerChannel)
{
case 32:
{
if (options.SampleFormat == TiffSampleFormat.Float)
{
options.ColorType = TiffColorType.BlackIsZero32Float;
return;
}
options.ColorType = TiffColorType.BlackIsZero32;
break;
}
case 24:
{
options.ColorType = TiffColorType.BlackIsZero24;
break;
}
case 16:
{
options.ColorType = TiffColorType.BlackIsZero16;
break;
}
case 8:
{
options.ColorType = TiffColorType.BlackIsZero8;
break;
}
case 4:
{
options.ColorType = TiffColorType.BlackIsZero4;
break;
}
case 1:
{
options.ColorType = TiffColorType.BlackIsZero1;
break;
}
default:
{
options.ColorType = TiffColorType.BlackIsZero;
break;
}
}
break;
}
case TiffPhotometricInterpretation.Rgb:
{
TiffBitsPerSample bitsPerSample = options.BitsPerSample;
if (bitsPerSample.Channels != 3)
{
TiffThrowHelper.ThrowNotSupported("The number of samples in the TIFF BitsPerSample entry is not supported.");
}
if (!(bitsPerSample.Channel0 == bitsPerSample.Channel1 && bitsPerSample.Channel1 == bitsPerSample.Channel2))
{
TiffThrowHelper.ThrowNotSupported("Only BitsPerSample with equal bits per channel are supported.");
}
if (options.PlanarConfiguration == TiffPlanarConfiguration.Chunky)
{
ushort bitsPerChannel = options.BitsPerSample.Channel0;
switch (bitsPerChannel)
{
case 32:
if (options.SampleFormat == TiffSampleFormat.Float)
{
options.ColorType = TiffColorType.RgbFloat323232;
return;
}
options.ColorType = TiffColorType.Rgb323232;
break;
case 24:
options.ColorType = TiffColorType.Rgb242424;
break;
case 16:
options.ColorType = TiffColorType.Rgb161616;
break;
case 14:
options.ColorType = TiffColorType.Rgb141414;
break;
case 12:
options.ColorType = TiffColorType.Rgb121212;
break;
case 10:
options.ColorType = TiffColorType.Rgb101010;
break;
case 8:
options.ColorType = TiffColorType.Rgb888;
break;
case 4:
options.ColorType = TiffColorType.Rgb444;
break;
case 2:
options.ColorType = TiffColorType.Rgb222;
break;
default:
TiffThrowHelper.ThrowNotSupported("Bits per sample is not supported.");
break;
}
}
else
{
ushort bitsPerChannel = options.BitsPerSample.Channel0;
switch (bitsPerChannel)
{
case 32:
options.ColorType = TiffColorType.Rgb323232Planar;
break;
case 24:
options.ColorType = TiffColorType.Rgb242424Planar;
break;
case 16:
options.ColorType = TiffColorType.Rgb161616Planar;
break;
default:
options.ColorType = TiffColorType.Rgb888Planar;
break;
}
}
break;
}
case TiffPhotometricInterpretation.PaletteColor:
{
options.ColorMap = exifProfile.GetValue(ExifTag.ColorMap)?.Value;
if (options.ColorMap != null)
{
if (options.BitsPerSample.Channels != 1)
{
TiffThrowHelper.ThrowNotSupported("The number of samples in the TIFF BitsPerSample entry is not supported.");
}
options.ColorType = TiffColorType.PaletteColor;
}
else
{
TiffThrowHelper.ThrowNotSupported("The TIFF ColorMap entry is missing for a palette color image.");
}
break;
}
case TiffPhotometricInterpretation.YCbCr:
{
options.ColorMap = exifProfile.GetValue(ExifTag.ColorMap)?.Value;
if (options.BitsPerSample.Channels != 3)
{
TiffThrowHelper.ThrowNotSupported("The number of samples in the TIFF BitsPerSample entry is not supported.");
}
ushort bitsPerChannel = options.BitsPerSample.Channel0;
if (bitsPerChannel != 8)
{
TiffThrowHelper.ThrowNotSupported("Only 8 bits per channel is supported for YCbCr images.");
}
options.ColorType = options.PlanarConfiguration == TiffPlanarConfiguration.Chunky ? TiffColorType.YCbCr : TiffColorType.YCbCrPlanar;
break;
}
default:
{
TiffThrowHelper.ThrowNotSupported($"The specified TIFF photometric interpretation is not supported: {options.PhotometricInterpretation}");
}
break;
}
}