CODEWITHSUNDEEP
c#.netwindowsuwpbyte
moh67
moh67

Reputation: 43

Convert byte to BitmapImage uwp c#

I try to convert a white bitmapImage to black. So i have a byte[] PixelArray, which is good but when i try to use this array to create my black image it doesn't work. Here is my code :

var stream = new InMemoryRandomAccessStream();
await stream.WriteAsync(byteArray.AsBuffer());
stream.Seek(0);
await image.SetSourceAsync(stream);

Thanks guys

Upvotes: 1

Views: 3282

Answers (1)

Jayden
Jayden

Reputation: 3286

As @Clemens said, we should be able to use WriteableBitmap. We can get the Width and the Height by BitmapDecoder.PixelWidth and BitmapDecoder.PixelHeight property. Then we can use WriteableBitmap.PixelBuffer to set the bytes Array to the WriteableBitmap.

PixelBuffer cannot be written to directly, however, you can use language-specific techniques to access the buffer and change its contents. To access the pixel content from C# or Microsoft Visual Basic, you can use the AsStream extension method to access the underlying buffer as a stream.

For more info, see Remarks of the WriteableBitmap.PixelBuffer.

For example:

IRandomAccessStream random = await RandomAccessStreamReference.CreateFromUri(ImageWhite.UriSour‌​ce).OpenReadAsync();
BitmapDecoder decoder = await BitmapDecoder.CreateAsync(random);
PixelDataProvider pixelData = await decoder.GetPixelDataAsync();
var PixelArray = pixelData.DetachPixelData();
WriteableBitmap bitmap = new WriteableBitmap((int)decoder.PixelWidth, (int)decoder.PixelHeight);
await bitmap.PixelBuffer.AsStream().WriteAsync(PixelArray, 0, PixelArray.Length);
MyImage.Source = bitmap;

Update:

To Convert the WriteableBitmap to BitmapImage, we should be able to encode the stream from WriteableBitmap.

For example:

InMemoryRandomAccessStream inMemoryRandomAccessStream = new InMemoryRandomAccessStream();
BitmapEncoder encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, inMemoryRandomAccessStream);
Stream pixelStream = bitmap.PixelBuffer.AsStream();
byte[] pixels = new byte[pixelStream.Length];
await pixelStream.ReadAsync(pixels, 0, pixels.Length);
encoder.SetPixelData(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Ignore, (uint)bitmap.PixelWidth, (uint)bitmap.PixelHeight, 96.0, 96.0, pixels);
await encoder.FlushAsync();
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.SetSource(inMemoryRandomAccessStream);
MyImage.Source = bitmapImage;

Upvotes: 2

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