public GifFrame(GifInfoCache info, ImageStorage image, int frameIndex)
{
BitmapImage imageSource = new BitmapImage();
Stream bitmapStream = new MemoryStream();
image.Save(bitmapStream, ImageFormat.Png);
bitmapStream.Seek(0, SeekOrigin.Begin);
imageSource.BeginInit();
imageSource.StreamSource = bitmapStream;
imageSource.EndInit();
if (imageSource.CanFreeze)
{
imageSource.Freeze();
}
this.ImageSource = imageSource;
this.DelayToNextMS = BitConverter.ToInt32(image.GetPropertyItem(kFrameDelayProperty).Value, frameIndex) * 10;
if (this.DelayToNextMS == 0 && info.Frames.Count > 0)
{
this.DelayToNextMS = info.Frames[0].DelayToNextMS;
}
else
{
this.DelayToNextMS = 100;
}
this.FrameIndex = frameIndex;
}
private static void HandleCurrentFrameIndexChanged(DependencyObject d, DependencyPropertyChangedEventArgs <int> e)
{
GifInfoCache info = GetInfo(d);
if (info == null)
{
return;
}
if (e.NewValue >= info.Frames.Count)
{
if (IsLooping(d, info))
{
SetCurrentFrameIndex(d, 0);
return;
}
else
{
SetCurrentFrameIndex(d, info.Frames.Count - 1);
SetIsPlaying(d, false);
return;
}
}
if (e.NewValue >= 0 && d is ImageControl imageControl)
{
imageControl.Source = info.Frames[e.NewValue].ImageSource;
}
}
internal static void SetInfo(DependencyObject obj, GifInfoCache value) => obj.SetValue(InfoPropertyKey, value);
// ==================[ Utilities ]======================== private static bool IsLooping(DependencyObject d, GifInfoCache info) => d.IsSetLocally(OverrideIsLoopingProperty) ? GetOverrideIsLooping(d) : info.IsLooping;