public static bool CanAnimate(GifImage image)
{
if (image == null)
{
return(false);
}
lock (image)
{
var dimensions = image.FrameDimensionsList;
if (dimensions.Select(guid => new GifFrameDimension(guid)).Contains(GifFrameDimension.Time))
{
return(image.GetFrameCount(GifFrameDimension.Time) > 1);
}
}
return(false);
}
internal static void EnsureSave(GifImage image, string filename, Stream dataStream)
{
if (!image.RawGuid.Equals(GifGuid))
{
return;
}
var animatedGif = false;
var dimensions = image.FrameDimensionsList;
if (dimensions.Select(guid => new GifFrameDimension(guid)).Contains(GifFrameDimension.Time))
{
animatedGif = image.GetFrameCount(GifFrameDimension.Time) > 1;
}
if (!animatedGif)
{
return;
}
try
{
Stream created = null;
long lastPos = 0;
if (dataStream != null)
{
lastPos = dataStream.Position;
dataStream.Position = 0;
}
try
{
if (dataStream == null)
{
created = dataStream = File.OpenRead(filename);
}
image._rawData = new byte[(int)dataStream.Length];
dataStream.Read(image._rawData, 0, (int)dataStream.Length);
}
finally
{
if (created != null)
{
created.Close();
}
else
{
// ReSharper disable once PossibleNullReferenceException
dataStream.Position = lastPos;
}
}
}
// possible exceptions for reading the filename
catch (UnauthorizedAccessException)
{
}
catch (DirectoryNotFoundException)
{
}
catch (IOException)
{
}
// possible exceptions for setting/getting the position inside dataStream
catch (NotSupportedException)
{
}
catch (ObjectDisposedException)
{
}
// possible exception when reading stuff into dataStream
catch (ArgumentException)
{
}
}