public async Task <ImageSource> SaveToImageSource(SpiderImage spiderImage)
{
ImageSource imageSource = null;
using (MemoryStream stream = new MemoryStream(spiderImage.Content))
{
var ras = stream.AsRandomAccessStream();
var decoderGuid = BitmapDecoder.JpegDecoderId;
switch (spiderImage.ImageType.ToLower())
{
case "image/png": { decoderGuid = BitmapDecoder.PngDecoderId; break; }
case "image/webp": { decoderGuid = BitmapDecoder.WebpDecoderId; break; }
case "image/gif": { decoderGuid = BitmapDecoder.GifDecoderId; break; }
}
BitmapDecoder decoder = await BitmapDecoder.CreateAsync(decoderGuid, ras);
var provider = await decoder.GetPixelDataAsync();
byte[] buffer = provider.DetachPixelData();
WriteableBitmap bitmap = new WriteableBitmap((int)decoder.PixelWidth, (int)decoder.PixelHeight);
await bitmap.PixelBuffer.AsStream().WriteAsync(buffer, 0, buffer.Length);
imageSource = bitmap;
}
return(imageSource);
}
private async Task LoadImage()
{
if (imgScrollViewer.VerticalScrollBarVisibility != ScrollBarVisibility.Disabled)
{
imgScrollViewer.VerticalScrollBarVisibility = ScrollBarVisibility.Disabled;
}
if (img.RenderTransform is ScaleTransform)
{
var transform = img.RenderTransform as ScaleTransform; transform.ScaleX = 1; transform.ScaleY = 1;
}
CurrentImage = ImageCollection.AsQueryable().Skip(skip).Take(take).FirstOrDefault();
if (CurrentImage == null)
{
skip -= 1; return;
}
await this.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.High, async() =>
{
img.Source = await SaveToImageSource(CurrentImage);
});
}