private static ObjectAnimationUsingKeyFrames GetAnimation(
Image imageControl,
BitmapSource source)
{
ObjectAnimationUsingKeyFrames animation1 = AnimationCache.GetAnimation((ImageSource)source, ImageBehavior.GetRepeatBehavior(imageControl));
if (animation1 != null)
{
return(animation1);
}
GifFile gifFile;
if (!(ImageBehavior.GetDecoder(source, out gifFile) is GifBitmapDecoder decoder) || decoder.Frames.Count <= 1)
{
return((ObjectAnimationUsingKeyFrames)null);
}
ImageBehavior.Int32Size fullSize = ImageBehavior.GetFullSize((BitmapDecoder)decoder, gifFile);
int frameIndex = 0;
ObjectAnimationUsingKeyFrames animation2 = new ObjectAnimationUsingKeyFrames();
TimeSpan zero = TimeSpan.Zero;
BitmapSource baseFrame = (BitmapSource)null;
foreach (BitmapFrame frame1 in decoder.Frames)
{
ImageBehavior.FrameMetadata frameMetadata = ImageBehavior.GetFrameMetadata((BitmapDecoder)decoder, gifFile, frameIndex);
BitmapSource frame2 = ImageBehavior.MakeFrame(fullSize, (BitmapSource)frame1, frameMetadata, baseFrame);
DiscreteObjectKeyFrame discreteObjectKeyFrame = new DiscreteObjectKeyFrame((object)frame2, (KeyTime)zero);
animation2.KeyFrames.Add((ObjectKeyFrame)discreteObjectKeyFrame);
zero += frameMetadata.Delay;
switch (frameMetadata.DisposalMethod)
{
case ImageBehavior.FrameDisposalMethod.None:
case ImageBehavior.FrameDisposalMethod.DoNotDispose:
baseFrame = frame2;
break;
case ImageBehavior.FrameDisposalMethod.RestoreBackground:
baseFrame = !ImageBehavior.IsFullFrame(frameMetadata, fullSize) ? ImageBehavior.ClearArea(frame2, frameMetadata) : (BitmapSource)null;
break;
}
++frameIndex;
}
animation2.Duration = (Duration)zero;
animation2.RepeatBehavior = ImageBehavior.GetActualRepeatBehavior(imageControl, (BitmapDecoder)decoder, gifFile);
AnimationCache.AddAnimation((ImageSource)source, ImageBehavior.GetRepeatBehavior(imageControl), animation2);
AnimationCache.IncrementReferenceCount((ImageSource)source, ImageBehavior.GetRepeatBehavior(imageControl));
return(animation2);
}