internal void AddTag(ImageTag tag)
{
if ((tag.TagTypes & AllowedTypes) != tag.TagTypes)
{
throw new Exception(String.Format("Attempted to add {0} to an image, but the only allowed types are {1}", tag.TagTypes, AllowedTypes));
}
if (tag is IFDTag)
{
Exif = tag as IFDTag;
}
else if (tag is XmpTag)
{
// we treat a IPTC-IIM tag as a XMP tag. However, we prefer the real XMP tag.
// See comments in Jpeg/File.cs for what we should do to deal with this properly.
if (Xmp != null && (tag is IIM.IIMTag || Xmp is IIM.IIMTag))
{
var iimTag = tag as IIM.IIMTag;
if (iimTag == null)
{
iimTag = Xmp as IIM.IIMTag;
Xmp = tag as XmpTag;
}
if (string.IsNullOrEmpty(Xmp.Title))
{
Xmp.Title = iimTag.Title;
}
if (string.IsNullOrEmpty(Xmp.Creator))
{
Xmp.Creator = iimTag.Creator;
}
if (string.IsNullOrEmpty(Xmp.Copyright))
{
Xmp.Copyright = iimTag.Copyright;
}
if (string.IsNullOrEmpty(Xmp.Comment))
{
Xmp.Comment = iimTag.Comment;
}
if (Xmp.Keywords == null)
{
Xmp.Keywords = iimTag.Keywords;
}
}
else
{
Xmp = tag as XmpTag;
}
}
else
{
OtherTags.Add(tag);
}
all_tags = null;
}
/// <summary>
/// Gets a tag of a specified type from the current instance,
/// optionally creating a new tag if possible.
/// </summary>
/// <param name="type">
/// A <see cref="TagLib.TagTypes" /> value indicating the
/// type of tag to read.
/// </param>
/// <param name="create">
/// A <see cref="bool" /> value specifying whether or not to
/// try and create the tag if one is not found.
/// </param>
/// <returns>
/// A <see cref="Tag" /> object containing the tag that was
/// found in or added to the current instance. If no
/// matching tag was found and none was created, <see
/// langword="null" /> is returned.
/// </returns>
public override TagLib.Tag GetTag(TagLib.TagTypes type,
bool create)
{
foreach (Tag tag in ImageTag.AllTags)
{
if ((tag.TagTypes & type) == type)
{
return(tag);
}
}
if (!create || (type & ImageTag.AllowedTypes) == 0)
{
return(null);
}
ImageTag new_tag = null;
switch (type)
{
case TagTypes.JpegComment:
new_tag = new JpegCommentTag();
break;
case TagTypes.GifComment:
new_tag = new GifCommentTag();
break;
case TagTypes.Png:
new_tag = new PngTag();
break;
case TagTypes.TiffIFD:
new_tag = new IFDTag();
break;
case TagTypes.XMP:
new_tag = new XmpTag();
break;
}
if (new_tag != null)
{
ImageTag.AddTag(new_tag);
return(new_tag);
}
throw new NotImplementedException(String.Format("Adding tag of type {0} not supported!", type));
}
internal void RemoveTag(ImageTag tag)
{
if (tag is IFDTag)
{
Exif = null;
}
else if (tag is XmpTag)
{
Xmp = null;
}
else
{
OtherTags.Remove(tag);
}
all_tags = null;
}