/// <summary>
/// Decodes the image data from a specified IFD.
/// </summary>
/// <typeparam name="TPixel">The pixel format.</typeparam>
/// <param name="tags">The IFD tags.</param>
/// <param name="cancellationToken">The token to monitor cancellation.</param>
/// <returns> The tiff frame. </returns>
private ImageFrame <TPixel> DecodeFrame <TPixel>(ExifProfile tags, CancellationToken cancellationToken)
where TPixel : unmanaged, IPixel <TPixel>
{
ImageFrameMetadata imageFrameMetaData = this.ignoreMetadata ?
new ImageFrameMetadata() :
new ImageFrameMetadata {
ExifProfile = tags, XmpProfile = tags.GetValue(ExifTag.XMP)?.Value
};
TiffFrameMetadata tiffFrameMetaData = imageFrameMetaData.GetTiffMetadata();
TiffFrameMetadata.Parse(tiffFrameMetaData, tags);
this.VerifyAndParse(tags, tiffFrameMetaData);
int width = GetImageWidth(tags);
int height = GetImageHeight(tags);
var frame = new ImageFrame <TPixel>(this.Configuration, width, height, imageFrameMetaData);
int rowsPerStrip = tags.GetValue(ExifTag.RowsPerStrip) != null ? (int)tags.GetValue(ExifTag.RowsPerStrip).Value : TiffConstants.RowsPerStripInfinity;
Number[] stripOffsets = tags.GetValue(ExifTag.StripOffsets)?.Value;
Number[] stripByteCounts = tags.GetValue(ExifTag.StripByteCounts)?.Value;
if (this.PlanarConfiguration == TiffPlanarConfiguration.Planar)
{
this.DecodeStripsPlanar(frame, rowsPerStrip, stripOffsets, stripByteCounts, cancellationToken);
}
else
{
this.DecodeStripsChunky(frame, rowsPerStrip, stripOffsets, stripByteCounts, cancellationToken);
}
return(frame);
}
/// <summary>
/// Decodes the image data from a specified IFD.
/// </summary>
/// <typeparam name="TPixel">The pixel format.</typeparam>
/// <param name="tags">The IFD tags.</param>
/// <param name="cancellationToken">The token to monitor cancellation.</param>
/// <returns> The tiff frame. </returns>
private ImageFrame <TPixel> DecodeFrame <TPixel>(ExifProfile tags, CancellationToken cancellationToken)
where TPixel : unmanaged, IPixel <TPixel>
{
var imageFrameMetaData = new ImageFrameMetadata();
if (!this.ignoreMetadata)
{
imageFrameMetaData.ExifProfile = tags;
}
TiffFrameMetadata tiffFrameMetaData = imageFrameMetaData.GetTiffMetadata();
TiffFrameMetadata.Parse(tiffFrameMetaData, tags);
this.VerifyAndParse(tags, tiffFrameMetaData);
int width = GetImageWidth(tags);
int height = GetImageHeight(tags);
var frame = new ImageFrame <TPixel>(this.Configuration, width, height, imageFrameMetaData);
int rowsPerStrip = tags.GetValue(ExifTag.RowsPerStrip) != null ? (int)tags.GetValue(ExifTag.RowsPerStrip).Value : TiffConstants.RowsPerStripInfinity;
var stripOffsetsArray = (Array)tags.GetValueInternal(ExifTag.StripOffsets).GetValue();
var stripByteCountsArray = (Array)tags.GetValueInternal(ExifTag.StripByteCounts).GetValue();
IMemoryOwner <ulong> stripOffsetsMemory = this.ConvertNumbers(stripOffsetsArray, out Span <ulong> stripOffsets);
IMemoryOwner <ulong> stripByteCountsMemory = this.ConvertNumbers(stripByteCountsArray, out Span <ulong> stripByteCounts);
if (this.PlanarConfiguration == TiffPlanarConfiguration.Planar)
{
this.DecodeStripsPlanar(
frame,
rowsPerStrip,
stripOffsets,
stripByteCounts,
cancellationToken);
}
else
{
this.DecodeStripsChunky(
frame,
rowsPerStrip,
stripOffsets,
stripByteCounts,
cancellationToken);
}
stripOffsetsMemory?.Dispose();
stripByteCountsMemory?.Dispose();
return(frame);
}
/// <inheritdoc/>
public IImageInfo Identify(BufferedReadStream stream, CancellationToken cancellationToken)
{
this.inputStream = stream;
var reader = new DirectoryReader(stream, this.Configuration.MemoryAllocator);
IEnumerable <ExifProfile> directories = reader.Read();
ExifProfile rootFrameExifProfile = directories.First();
var rootMetadata = TiffFrameMetadata.Parse(rootFrameExifProfile);
ImageMetadata metadata = TiffDecoderMetadataCreator.Create(reader.ByteOrder, reader.IsBigTiff, rootFrameExifProfile);
int width = GetImageWidth(rootFrameExifProfile);
int height = GetImageHeight(rootFrameExifProfile);
return(new ImageInfo(new PixelTypeInfo((int)rootMetadata.BitsPerPixel), width, height, metadata));
}
