/// <summary>
/// Converts the EXIF meta data to JPEG format.
/// </summary>
/// <param name="metaData">The meta data to convert.</param>
/// <returns>The converted meta data or null.</returns>
private static BitmapMetadata ConvertEXIFMetaData(BitmapMetadata metaData)
{
BitmapMetadata exifData = null;
try
{
exifData = metaData.GetQuery("/ifd/exif") as BitmapMetadata;
}
catch (IOException)
{
// WINCODEC_ERR_INVALIDQUERYREQUEST
}
// Return null if the EXIF block does not contain any data.
if ((exifData == null) || !exifData.Any())
{
return(null);
}
BitmapMetadata jpegMetaData = new BitmapMetadata("jpg");
jpegMetaData.SetQuery("/app1/ifd/exif", new BitmapMetadata("exif"));
foreach (var tag in exifData)
{
object value = exifData.GetQuery(tag);
BitmapMetadata exifSub = value as BitmapMetadata;
if (exifSub != null)
{
CopySubBlockRecursive(ref jpegMetaData, exifSub, "/app1/ifd/exif" + tag);
}
else
{
jpegMetaData.SetQuery("/app1/ifd/exif" + tag, value);
}
}
// Set the fields that are relevant for EXIF.
try
{
if (!string.IsNullOrEmpty(metaData.ApplicationName))
{
jpegMetaData.ApplicationName = metaData.ApplicationName;
}
if (!string.IsNullOrEmpty(metaData.CameraManufacturer))
{
jpegMetaData.CameraManufacturer = metaData.CameraManufacturer;
}
if (!string.IsNullOrEmpty(metaData.CameraModel))
{
jpegMetaData.CameraModel = metaData.CameraModel;
}
}
catch (NotSupportedException)
{
}
return(jpegMetaData);
}
/// <summary>
/// Converts the XMP meta data to TIFF format.
/// </summary>
/// <param name="metaData">The meta data to convert.</param>
/// <param name="format">The format of the meta data.</param>
/// <returns>The converted meta data or null.</returns>
private static BitmapMetadata ConvertXMPMetaData(BitmapMetadata metaData, string format)
{
BitmapMetadata xmpData = null;
try
{
if (format == "png")
{
BitmapMetadata textChunk = metaData.GetQuery("/iTXt") as BitmapMetadata;
if (textChunk != null)
{
string keyWord = textChunk.GetQuery("/Keyword") as string;
if (keyWord == "XML:com.adobe.xmp")
{
string textEntry = textChunk.GetQuery("/TextEntry") as string;
if (!string.IsNullOrEmpty(textEntry))
{
xmpData = LoadPNGMetaData(textEntry);
}
}
}
}
else if (format == "jpg")
{
xmpData = metaData.GetQuery("/xmp") as BitmapMetadata;
}
else
{
try
{
xmpData = metaData.GetQuery("/ifd/xmp") as BitmapMetadata;
}
catch (IOException)
{
// WINCODEC_ERR_INVALIDQUERYREQUEST
}
if (xmpData == null)
{
// Some codecs may store the XMP data outside of the IFD block.
xmpData = metaData.GetQuery("/xmp") as BitmapMetadata;
}
}
}
catch (IOException)
{
// WINCODEC_ERR_INVALIDQUERYREQUEST
}
// Return null if the XMP block does not contain any data.
if ((xmpData == null) || !xmpData.Any())
{
return(null);
}
BitmapMetadata tiffMetaData = new BitmapMetadata("tiff");
tiffMetaData.SetQuery("/ifd/xmp", new BitmapMetadata("xmp"));
foreach (var tag in xmpData)
{
object value = xmpData.GetQuery(tag);
BitmapMetadata xmpSub = value as BitmapMetadata;
if (xmpSub != null)
{
CopySubBlockRecursive(ref tiffMetaData, xmpSub, "/ifd/xmp" + tag);
}
else
{
tiffMetaData.SetQuery("/ifd/xmp" + tag, value);
}
}
return(tiffMetaData);
}
