public Bitmap LoadExifThumbnail()
{
CheckDisposedState();
if (_exifThumbnail == null)
{
IFormatReader formatReader = FormatManager.CreateFormatReader(_sourceFileName);
try
{
if (formatReader.MediaFormat == FormatManager.JpegFormat)
{
JpegReader jpgReader = (JpegReader)formatReader;
if (jpgReader.Exif != null && jpgReader.Exif.Contains(ExifDictionary.Thumbnail))
{
_exifThumbnail = (Bitmap)jpgReader.Exif[ExifDictionary.Thumbnail];
if (jpgReader.Exif.Contains(ExifDictionary.Orientation))
{
_exifAngle = ExifOrientationToAngle(jpgReader.Exif[ExifDictionary.Orientation]);
}
if (_exifAngle > 0 && !_exifThumbnail.IsEmpty)
{
_exifThumbnail.Transforms.Rotate(_exifAngle);
}
return(_exifThumbnail);
}
}
else if (formatReader.MediaFormat == FormatManager.TiffFormat)
{
TiffReader tiffReader = (TiffReader)formatReader;
if (tiffReader.Exif != null && tiffReader.Exif.Contains(ExifDictionary.Thumbnail))
{
_exifThumbnail = (Bitmap)tiffReader.Exif[ExifDictionary.Thumbnail];
if (tiffReader.Exif.Contains(ExifDictionary.Orientation))
{
_exifAngle = ExifOrientationToAngle(tiffReader.Exif[ExifDictionary.Orientation]);
}
if (_exifAngle > 0 && !_exifThumbnail.IsEmpty)
{
_exifThumbnail.Transforms.Rotate(_exifAngle);
}
return(_exifThumbnail);
}
}
else if (formatReader.MediaFormat == FormatManager.PsdFormat)
{
PsdReader psdReader = (PsdReader)formatReader;
if (psdReader.Exif != null && psdReader.Exif.Contains(ExifDictionary.Thumbnail))
{
_exifThumbnail = (Bitmap)psdReader.Exif[ExifDictionary.Thumbnail];
if (psdReader.Exif.Contains(ExifDictionary.Orientation))
{
_exifAngle = ExifOrientationToAngle(psdReader.Exif[ExifDictionary.Orientation]);
}
if (_exifAngle > 0 && !_exifThumbnail.IsEmpty)
{
_exifThumbnail.Transforms.Rotate(_exifAngle);
}
return(_exifThumbnail);
}
}
}
finally
{
if (formatReader != null)
{
formatReader.Close();
formatReader.Dispose();
}
}
}
return(_exifThumbnail);
}
