/// <inheritdoc />
public override async Task InvokeAsync(ILoadingContext <ImageSource> context, LoadingPipeDelegate <ImageSource> next, CancellationToken cancellationToken = default)
{
if (context.Current is Stream stream)
{
if (!stream.CanSeek)
{
var memoryStream = new MemoryStream();
await stream.CopyToAsync(memoryStream);
if (!ReferenceEquals(stream, context.OriginSource))
{
// if the stream generated by the pipe then dispose it.
stream.Dispose();
}
memoryStream.Seek(0, SeekOrigin.Begin);
stream = memoryStream;
}
var isSvg = IsSvg(stream);
var tcs = new TaskCompletionSource <object?>();
context.InvokeOnUIThread(async() =>
{
try
{
if (isSvg)
{
var bitmap = new SvgImageSource();
context.AttachSource(bitmap);
var svgImageLoadStatus = await bitmap.SetSourceAsync(stream.AsRandomAccessStream());
if (svgImageLoadStatus != SvgImageSourceLoadStatus.Success)
{
throw new SvgImageFailedStatusException(svgImageLoadStatus);
}
cancellationToken.ThrowIfCancellationRequested();
context.Current = bitmap;
}
else
{
// https://docs.microsoft.com/en-us/windows/uwp/debug-test-perf/optimize-animations-and-media?redirectedfrom=MSDN#right-sized-decoding
// Set source after attached to the XAML tree
var bitmap = new BitmapImage();
context.AttachSource(bitmap);
await bitmap.SetSourceAsync(stream.AsRandomAccessStream());
cancellationToken.ThrowIfCancellationRequested();
context.Current = bitmap;
}
tcs.SetResult(null);
}
catch (Exception ex)
{
tcs.SetException(ex);
}
});
await tcs.Task;
}
await next(context, cancellationToken);
}
/// <inheritdoc />
public override async Task InvokeAsync(ILoadingContext <ICompositionSurface> context, LoadingPipeDelegate <ICompositionSurface> next, CancellationToken cancellationToken = default)
{
if (context.Current is Stream stream)
{
var tcs = new TaskCompletionSource <LoadedImageSurface>();
var imageSurface = LoadedImageSurface.StartLoadFromStream(stream.AsRandomAccessStream());
context.AttachSource(imageSurface);
TypedEventHandler <LoadedImageSurface, LoadedImageSourceLoadCompletedEventArgs> handler = null !;
handler = (sender, args) =>
{
imageSurface.LoadCompleted -= handler;
switch (args.Status)
{
case LoadedImageSourceLoadStatus.Success:
tcs.SetResult(sender);
break;
default:
tcs.SetException(new ImageSurfaceFailedStatusException(args.Status));
break;
}
};
imageSurface.LoadCompleted += handler;
context.Current = await tcs.Task;
}
await next(context, cancellationToken);
}
/// <inheritdoc />
public override async Task InvokeAsync(ILoadingContext <TSource> context, LoadingPipeDelegate <TSource> next, CancellationToken cancellationToken = default)
{
if (IsInDesignMode)
{
await next(context, cancellationToken);
return;
}
var cacheKey = context.Current;
if (cacheKey is string || cacheKey is Uri)
{
if (MemoryCache.TryGetValue(cacheKey, out var cacheValue))
{
context.Current = cacheValue;
context.AttachSource(cacheValue);
return;
}
await next(context, cancellationToken);
if (context.Current is TSource finalValue)
{
MemoryCache[cacheKey] = finalValue;
}
return;
}
await next(context, cancellationToken);
}
/// <inheritdoc />
public override async Task InvokeAsync(ILoadingContext <ImageSource> context, LoadingPipeDelegate <ImageSource> next, CancellationToken cancellationToken = default)
{
if (context.Current is Stream stream)
{
if (!stream.CanSeek)
{
var memoryStream = new MemoryStream();
await stream.CopyToAsync(memoryStream);
memoryStream.Seek(0, SeekOrigin.Begin);
stream = memoryStream;
}
var isWebP = IsWebP(stream);
var tcs = new TaskCompletionSource <ImageSource>();
await Task.Run(() =>
{
Image webPImage = null;
if (isWebP)
{
var webPFormat = new WebPFormat();
webPImage = webPFormat.Load(stream);
}
if (webPImage != null)
{
var webPMemoryStream = new MemoryStream();
webPImage.Save(webPMemoryStream, ImageFormat.Png);
stream = webPMemoryStream;
}
stream.Seek(0, SeekOrigin.Begin);
try
{
var bitmap = new BitmapImage();
bitmap.BeginInit();
bitmap.StreamSource = stream;
bitmap.EndInit();
bitmap.Freeze();
context.UIContext.Send(state =>
{
context.AttachSource(bitmap);
}, null);
tcs.SetResult(bitmap);
}
catch (Exception ex)
{
tcs.SetException(ex);
}
}, cancellationToken);
context.Current = await tcs.Task;
}
await next(context, cancellationToken);
}
/// <inheritdoc />
public override async Task InvokeAsync(ILoadingContext <ImageSource> context, LoadingPipeDelegate <ImageSource> next, CancellationToken cancellationToken = default)
{
if (context.Current is Stream stream)
{
if (!stream.CanSeek)
{
var memoryStream = new MemoryStream();
#if NETCOREAPP3_1
await stream.CopyToAsync(memoryStream, cancellationToken);
if (!ReferenceEquals(stream, context.OriginSource))
{
// if the stream generated by the pipe then dispose it.
await stream.DisposeAsync();
}
#else
await stream.CopyToAsync(memoryStream);
if (!ReferenceEquals(stream, context.OriginSource))
{
// if the stream generated by the pipe then dispose it.
stream.Dispose();
}
#endif
memoryStream.Seek(0, SeekOrigin.Begin);
stream = memoryStream;
}
var tcs = new TaskCompletionSource <ImageSource>();
await Task.Run(() =>
{
stream.Seek(0, SeekOrigin.Begin);
try
{
var bitmap = new BitmapImage();
bitmap.BeginInit();
bitmap.StreamSource = stream;
bitmap.EndInit();
bitmap.Freeze();
context.InvokeOnUIThread(() =>
{
context.AttachSource(bitmap);
});
tcs.SetResult(bitmap);
}
catch (Exception ex)
{
tcs.SetException(ex);
}
}, cancellationToken);
context.Current = await tcs.Task;
}
await next(context, cancellationToken);
}
/// <inheritdoc />
public override async Task InvokeAsync(ILoadingContext <ImageExSource> context, LoadingPipeDelegate <ImageExSource> next, CancellationToken cancellationToken = default)
{
if (context.Current is Stream stream)
{
if (!stream.CanSeek)
{
var memoryStream = new MemoryStream();
#if NETCOREAPP3_1
await stream.CopyToAsync(memoryStream, cancellationToken);
if (!ReferenceEquals(stream, context.OriginSource))
{
// if the stream generated by the pipe then dispose it.
await stream.DisposeAsync();
}
#else
await stream.CopyToAsync(memoryStream);
if (!ReferenceEquals(stream, context.OriginSource))
{
// if the stream generated by the pipe then dispose it.
stream.Dispose();
}
#endif
memoryStream.Seek(0, SeekOrigin.Begin);
stream = memoryStream;
}
var tcs = new TaskCompletionSource <ImageExSource>();
await Task.Run(() =>
{
using var codec = SKCodec.Create(stream, out var codecResult);
if (codecResult != SKCodecResult.Success)
{
tcs.SetException(new Exception(codecResult.ToString()));
return;
}
var codecInfo = codec.Info;
var frameCount = codec.FrameCount;
if (frameCount <= 0)
{
var source = new ImageExSource
{
Frames = new ImageExFrame[1],
RepetitionCount = codec.RepetitionCount,
Width = codecInfo.Width,
Height = codecInfo.Height
};
var bitmap = new SKBitmap(codecInfo);
var pointer = bitmap.GetPixels();
codec.GetPixels(bitmap.Info, pointer);
source.Frames[0] = new ImageExFrame
{
Bitmap = bitmap
};
context.InvokeOnUIThread(() =>
{
context.AttachSource(source);
});
tcs.SetResult(source);
}
else
{
var source = new ImageExSource
{
Frames = new ImageExFrame[frameCount],
RepetitionCount = codec.RepetitionCount,
Width = codecInfo.Width,
Height = codecInfo.Height
};
for (var frameIndex = 0; frameIndex < frameCount; frameIndex++)
{
var bitmap = new SKBitmap(codecInfo);
var pointer = bitmap.GetPixels();
var codecOptions = new SKCodecOptions(frameIndex);
codec.GetPixels(bitmap.Info, pointer, codecOptions);
var frameInfo = codec.FrameInfo[frameIndex];
var duration = frameInfo.Duration;
source.Frames[frameIndex] = new ImageExFrame
{
Bitmap = bitmap,
Duration = duration
};
}
context.InvokeOnUIThread(() =>
{
context.AttachSource(source);
});
tcs.SetResult(source);
}
}, cancellationToken);
context.Current = await tcs.Task;
#if NETCOREAPP3_1
if (!ReferenceEquals(stream, context.OriginSource))
{
// if the stream generated by the pipe then dispose it.
await stream.DisposeAsync();
}
#else
if (!ReferenceEquals(stream, context.OriginSource))
{
// if the stream generated by the pipe then dispose it.
stream.Dispose();
}
#endif
}
await next(context, cancellationToken);
}