protected override MediaTransformResult TransformStream(Stream stream, out Stream transformedStream)
{
var bitmap = BitmapFrame.Create(stream);
var exifData = _exifParser.Parse(bitmap);
transformedStream = new MemoryStream();
Serialize(transformedStream, exifData);
transformedStream.Seek(0, SeekOrigin.Begin);
return(MediaTransformResult.Success);
}
private static Surface GetOrientedSurface(byte[] bytes, out ExifValueCollection exifMetadata)
{
exifMetadata = null;
Surface surface = WebPFile.Load(bytes);
byte[] exifBytes = WebPFile.GetExifBytes(bytes);
if (exifBytes != null)
{
exifMetadata = ExifParser.Parse(exifBytes);
if (exifMetadata != null)
{
ExifValue orientationProperty = exifMetadata.GetAndRemoveValue(ExifPropertyKeys.Image.Orientation.Path);
if (orientationProperty != null)
{
MetadataHelpers.ApplyOrientationTransform(orientationProperty, ref surface);
}
}
}
return(surface);
}
private static Document GetOrientedDocument(byte[] bytes, out ExifValueCollection exifMetadata)
{
exifMetadata = null;
Document doc = null;
// Load the image into a Bitmap so the EXIF orientation transform can be applied.
using (Bitmap image = WebPFile.Load(bytes))
{
byte[] exifBytes = WebPFile.GetExifBytes(bytes);
if (exifBytes != null)
{
exifMetadata = ExifParser.Parse(exifBytes);
if (exifMetadata.Count > 0)
{
MetadataEntry orientationProperty = exifMetadata.GetAndRemoveValue(MetadataKeys.Image.Orientation);
if (orientationProperty != null)
{
RotateFlipType transform = MetadataHelpers.GetOrientationTransform(orientationProperty);
if (transform != RotateFlipType.RotateNoneFlipNone)
{
image.RotateFlip(transform);
}
}
MetadataEntry xResProperty = exifMetadata.GetAndRemoveValue(MetadataKeys.Image.XResolution);
MetadataEntry yResProperty = exifMetadata.GetAndRemoveValue(MetadataKeys.Image.YResolution);
MetadataEntry resUnitProperty = exifMetadata.GetAndRemoveValue(MetadataKeys.Image.ResolutionUnit);
if (xResProperty != null && yResProperty != null && resUnitProperty != null)
{
if (MetadataHelpers.TryDecodeRational(xResProperty, out double xRes) &&
MetadataHelpers.TryDecodeRational(yResProperty, out double yRes) &&
MetadataHelpers.TryDecodeShort(resUnitProperty, out ushort resUnit))
{
if (xRes > 0.0 && yRes > 0.0)
{
double dpiX, dpiY;
switch ((MeasurementUnit)resUnit)
{
case MeasurementUnit.Centimeter:
dpiX = Document.DotsPerCmToDotsPerInch(xRes);
dpiY = Document.DotsPerCmToDotsPerInch(yRes);
break;
case MeasurementUnit.Inch:
dpiX = xRes;
dpiY = yRes;
break;
default:
// Unknown ResolutionUnit value.
dpiX = 0.0;
dpiY = 0.0;
break;
}
if (dpiX > 0.0 && dpiY > 0.0)
{
try
{
image.SetResolution((float)dpiX, (float)dpiY);
}
catch
{
// Ignore any errors when setting the resolution.
}
}
}
}
}
}
}
doc = Document.FromGdipImage(image);
}
return(doc);
}
private static void AddAvifMetadataToDocument(Document doc, AvifReader reader, IByteArrayPool arrayPool)
{
byte[] exifBytes = reader.GetExifData();
if (exifBytes != null)
{
ExifValueCollection exifValues = ExifParser.Parse(exifBytes, arrayPool);
if (exifValues != null)
{
exifValues.Remove(MetadataKeys.Image.InterColorProfile);
// The HEIF specification states that the EXIF orientation tag is only
// informational and should not be used to rotate the image.
// See https://github.com/strukturag/libheif/issues/227#issuecomment-642165942
exifValues.Remove(MetadataKeys.Image.Orientation);
foreach (MetadataEntry entry in exifValues)
{
doc.Metadata.AddExifPropertyItem(entry.CreateExifPropertyItem());
}
}
}
CICPColorData?imageColorData = reader.ImageColorData;
if (imageColorData.HasValue)
{
string serializedValue = CICPSerializer.TrySerialize(imageColorData.Value);
if (serializedValue != null)
{
doc.Metadata.SetUserValue(CICPMetadataName, serializedValue);
}
}
ImageGridMetadata imageGridMetadata = reader.ImageGridMetadata;
if (imageGridMetadata != null)
{
string serializedValue = imageGridMetadata.SerializeToString();
if (serializedValue != null)
{
doc.Metadata.SetUserValue(ImageGridName, serializedValue);
}
}
byte[] iccProfileBytes = reader.GetICCProfile();
if (iccProfileBytes != null)
{
doc.Metadata.AddExifPropertyItem(ExifSection.Image,
unchecked ((ushort)ExifTagID.IccProfileData),
new ExifValue(ExifValueType.Undefined,
iccProfileBytes));
}
byte[] xmpBytes = reader.GetXmpData();
if (xmpBytes != null)
{
XmpPacket xmpPacket = XmpPacket.TryParse(xmpBytes);
if (xmpPacket != null)
{
doc.Metadata.SetXmpPacket(xmpPacket);
}
}
}