public APNGAnimationProvider(string path, Dispatcher uiDispatcher) : base(path, uiDispatcher)
{
var decoder = new APNGBitmap(path);
if (decoder.IsSimplePNG)
{
_imageMagickProvider = new ImageMagickProvider(path, uiDispatcher);
return;
}
_frames = new List <FrameInfo>(decoder.Frames.Length);
_renderedFrames = new List <BitmapSource>(decoder.Frames.Length);
Enumerable.Repeat(0, decoder.Frames.Length).ForEach(_ => _renderedFrames.Add(null));
Animator = new Int32AnimationUsingKeyFrames {
RepeatBehavior = RepeatBehavior.Forever
};
var wallclock = TimeSpan.Zero;
for (var i = 0; i < decoder.Frames.Length; i++)
{
var frame = decoder.Frames[i];
_frames.Add(new FrameInfo(decoder.IHDRChunk, frame));
Animator.KeyFrames.Add(new DiscreteInt32KeyFrame(i, KeyTime.FromTimeSpan(wallclock)));
wallclock += _frames[i].Delay;
}
}
private static AnimationProvider LoadFullImageCore(Uri path, Dispatcher uiDispatcher)
{
byte[] sign;
using (var reader =
new BinaryReader(new FileStream(path.LocalPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)))
{
sign = reader.BaseStream.Length < 4 ? new byte[] { 0, 0, 0, 0 } : reader.ReadBytes(4);
}
AnimationProvider provider;
if (sign[0] == 'G' && sign[1] == 'I' && sign[2] == 'F' && sign[3] == '8')
{
provider = new GifAnimationProvider(path.LocalPath, uiDispatcher);
}
else if (sign[0] == 0x89 && sign[1] == 'P' && sign[2] == 'N' && sign[3] == 'G')
{
provider = new APNGAnimationProvider(path.LocalPath, uiDispatcher);
}
else
{
provider = new ImageMagickProvider(path.LocalPath, uiDispatcher);
}
return(provider);
}
public override void Dispose()
{
if (_imageMagickProvider != null)
{
_imageMagickProvider.Dispose();
_imageMagickProvider = null;
return;
}
_frames.Clear();
_renderedFrames.Clear();
}