public static async Task <BitmapHolder> ToBitmapHolderAsync(this Stream imageStream, Tuple <int, int> downscale, bool downscaleDipUnits, InterpolationMode mode, bool allowUpscale, ImageInformation imageInformation = null)
{
if (imageStream == null)
{
return(null);
}
using (imageStream)
{
if (downscale != null && (downscale.Item1 > 0 || downscale.Item2 > 0))
{
WriteableBitmap downscaledImage = imageStream.ResizeImage(downscale.Item1, downscale.Item2, mode, downscaleDipUnits, allowUpscale, imageInformation);
return(new BitmapHolder(await downscaledImage.ToBytesAsync(), downscaledImage.PixelWidth, downscaledImage.PixelHeight));
}
BitmapDecoder decoder = NewDecoder(imageStream);
BitmapFrame firstFrame = decoder.Frames.First();
firstFrame.Freeze();
if (imageInformation != null)
{
imageInformation.SetCurrentSize(firstFrame.PixelWidth, firstFrame.PixelHeight);
imageInformation.SetOriginalSize(firstFrame.PixelWidth, firstFrame.PixelHeight);
}
return(new BitmapHolder(await firstFrame.ToBytesAsync(), firstFrame.PixelWidth, firstFrame.PixelHeight));
}
}