public static FrameMetadata GetFrameMetadata(BitmapDecoder decoder, GifFile gifMetadata, int frameIndex)
{
if (gifMetadata != null && gifMetadata.Frames.Count > frameIndex)
{
return(GetFrameMetadata(gifMetadata.Frames[frameIndex]));
}
return(GetFrameMetadata(decoder.Frames[frameIndex]));
}
public static System.Drawing.Size GetFullSize(BitmapDecoder decoder, GifFile gifMetadata)
{
if (gifMetadata != null)
{
var lsd = gifMetadata.Header.LogicalScreenDescriptor;
return(new System.Drawing.Size(lsd.Width, lsd.Height));
}
var width = decoder.Metadata.GetQueryOrDefault("/logscrdesc/Width", 0);
var height = decoder.Metadata.GetQueryOrDefault("/logscrdesc/Height", 0);
return(new System.Drawing.Size(width, height));
}
public static BitmapDecoder GetDecoder(string fileName, out GifFile gifFile)
{
gifFile = null;
BitmapDecoder decoder = null;
using (var stream = new FileStream(fileName, FileMode.Open))
{
stream.Position = 0;
decoder = BitmapDecoder.Create(stream, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
if (decoder is GifBitmapDecoder)// && !CanReadNativeMetadata(decoder))
{
stream.Position = 0;
gifFile = GifFile.ReadGifFile(stream, true);
}
//if (decoder == null)
// throw new InvalidOperationException("Can't get a decoder from the source.");
}
return(decoder);
}
