/// <summary>
/// Reads the <see cref="GifFrameMetaData"/> from a Frame in a GIF File
/// </summary>
/// <param name="frame"></param>
/// <returns>
/// Returns NULL if <see cref="BitmapFrame.InternalMetadata"/> is not from type <see cref="BitmapMetadata"/> or querys "/grctlext" & "/imgdesc" not exist.
/// </returns>
public static GifFrameMetaData GetGifFrameMetaData(BitmapFrame frame)
{
if (frame.Metadata is BitmapMetadata frameMetaData)
{
BitmapMetadata grctlext = (BitmapMetadata)frameMetaData.GetQuery("/grctlext");
BitmapMetadata imgdesc = (BitmapMetadata)frameMetaData.GetQuery("/imgdesc");
if (grctlext != null && imgdesc != null)
{
var test = frameMetaData.GetQuery("/grctlext/Disposal");
return(new GifFrameMetaData(
imgdesc.GetQueryValue("/Left", 0),
imgdesc.GetQueryValue("/Top", 0),
imgdesc.GetQueryValue("/Width", 0),
imgdesc.GetQueryValue("/Height", 0),
TimeSpan.FromMilliseconds(grctlext.GetQueryValue("/Delay", 10) * 10),
(GifFrameDisposalMethod)grctlext.GetQueryValue("/Disposal", 0)));
}
else
{
return(null);
}
}
else
{
return(null);
}
}
/// <summary>
/// Reads the <see cref="GifMetaData"/> for a GIF Image from a <see cref="BitmapDecoder"/>
/// </summary>
/// <param name="decoder"></param>
/// <returns>
/// Returns NULL if <see cref="BitmapDecoder.Metadata"/> is not from type <see cref="BitmapMetadata"/> or querys "/logscrdesc" not exist.
/// </returns>
public static GifMetaData GetGifMetaData(BitmapDecoder decoder)
{
if (decoder.Metadata is BitmapMetadata decoderMetaData)
{
BitmapMetadata logsrcdesc = (BitmapMetadata)decoderMetaData.GetQuery("/logscrdesc");
if (logsrcdesc != null)
{
return(new GifMetaData(
logsrcdesc.GetQueryValue("/Width", 0),
logsrcdesc.GetQueryValue("/Height", 0)));
}
return
(null);
}
else
{
return(null);
}
}
