private static BitmapSource MakeFrame(
ImageBehavior.Int32Size fullSize,
BitmapSource rawFrame,
ImageBehavior.FrameMetadata metadata,
BitmapSource baseFrame)
{
if (baseFrame == null && ImageBehavior.IsFullFrame(metadata, fullSize))
{
return(rawFrame);
}
DrawingVisual drawingVisual = new DrawingVisual();
using (DrawingContext drawingContext = drawingVisual.RenderOpen())
{
if (baseFrame != null)
{
Rect rectangle = new Rect(0.0, 0.0, (double)fullSize.Width, (double)fullSize.Height);
drawingContext.DrawImage((ImageSource)baseFrame, rectangle);
}
Rect rectangle1 = new Rect((double)metadata.Left, (double)metadata.Top, (double)metadata.Width, (double)metadata.Height);
drawingContext.DrawImage((ImageSource)rawFrame, rectangle1);
}
RenderTargetBitmap renderTargetBitmap = new RenderTargetBitmap(fullSize.Width, fullSize.Height, 96.0, 96.0, PixelFormats.Pbgra32);
renderTargetBitmap.Render((Visual)drawingVisual);
if (renderTargetBitmap.CanFreeze && !renderTargetBitmap.IsFrozen)
{
renderTargetBitmap.Freeze();
}
return((BitmapSource)renderTargetBitmap);
}
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);
}
private static bool IsFullFrame(
ImageBehavior.FrameMetadata metadata,
ImageBehavior.Int32Size fullSize)
{
return(metadata.Left == 0 && metadata.Top == 0 && metadata.Width == fullSize.Width && metadata.Height == fullSize.Height);
}