UWP 从 BitmapImage 获取字节或像素

Question

I have to make parallel work (of course async Task) that blur images selected from folder, so I have found this (BitmapImage), but the problem is what i do not know how to access bytes or pixels of this object, so that I can change them, blur or something else:

var folderPicker = new Windows.Storage.Pickers.FolderPicker();
            folderPicker.FileTypeFilter.Add(".jpg");
            folderPicker.FileTypeFilter.Add(".jpeg");
            folderPicker.FileTypeFilter.Add(".png");

            var folder = await folderPicker.PickSingleFolderAsync();
            var filesList = await folder.GetFilesAsync();



            for (int i = 0; i < filesList.Count; i++)
            {
                using (var stream = await filesList[i].OpenAsync(Windows.Storage.FileAccessMode.Read))
                {
//Here I will use some array of BitmapImage 
                    var bitmapImage = new Windows.UI.Xaml.Media.Imaging.BitmapImage();
                    await bitmapImage.SetSourceAsync(stream);

                    //show Image on Form
                    imageSourceForm.Source = bitmapImage;
                }

            }

So is there any way to get pixels or bytes of this object, or maybe do you know what to use that I can do work, but with async Task. The most important part is that UI Thread has to be responsive, while the images are blurring. Thanks in advance.

Answer 1

You could use the following code to get bytes of an image:

var random = await Windows.Storage.Streams.RandomAccessStreamReference.CreateFromFile(filesList[i]).OpenReadAsync();
Windows.Graphics.Imaging.BitmapDecoder decoder = await Windows.Graphics.Imaging.BitmapDecoder.CreateAsync(random);
Windows.Graphics.Imaging.PixelDataProvider pixelData = await decoder.GetPixelDataAsync();

//Access pixel buffer in such a way
byte[] bytes = pixelData.DetachPixelData();