public static bool CanAnimate(Image image)
{
if (image == null)
{
return(false);
}
int n = image.FrameDimensionsList.Length;
if (n < 1)
{
return(false);
}
for (int i = 0; i < n; i++)
{
if (image.FrameDimensionsList [i].Equals(FrameDimension.Time.Guid))
{
return(image.GetFrameCount(FrameDimension.Time) > 1);
}
}
return(false);
}
public AnimateEventArgs(Image image)
{
frameCount = image.GetFrameCount(FrameDimension.Time);
}
/// <summary>
/// 验证保存 TODO 2019-08
/// </summary>
/// <param name="image"></param>
/// <param name="filename"></param>
/// <param name="dataStream"></param>
internal static void EnsureSave(Image image, string filename, Stream dataStream)
{
if (image.RawFormat.Equals(ImageFormat.Gif))
{
bool animatedGif = false;
Guid[] dimensions = image.FrameDimensionsList;
foreach (Guid guid in dimensions)
{
FrameDimension dimension = new FrameDimension(guid);
if (dimension.Equals(FrameDimension.Time))
{
animatedGif = image.GetFrameCount(FrameDimension.Time) > 1;
break;
}
}
if (animatedGif)
{
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
{
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)
{
}
}
}
}
