Unsupportable bitmap format. Byte array to SoftwareBitmap (UWP C#)

Question

Help cant convert byte array to SoftwareBitmap. Error: enter image description here

WriteableBitmap b = new WriteableBitmap(Weight*frame_size,Height*frame_size);
// WriteableBitmap uses BGRA format which is 4 bytes per pixel.
byte[] imageArray = new byte[b.PixelHeight * b.PixelWidth * 4];
for (int i = 0; i < imageArray.Length; i += 4)
{
    imageArray[i] = 0; // Blue
    imageArray[i + 1] = 0;  // Green
    imageArray[i + 2] = 255; // Red
    imageArray[i + 3] = 0;
}
//Open a stream to copy the image contents to the WriteableBitmap's pixel buffer 
using (Stream stream = b.PixelBuffer.AsStream())
{
    await stream.WriteAsync(imageArray, 0, imageArray.Length);
}

SoftwareBitmap outputBitmap = SoftwareBitmap.CreateCopyFromBuffer(b.PixelBuffer,BitmapPixelFormat.Bgra8,b.PixelWidth,b.PixelHeight);

Sunteen Wu · Accepted Answer · 2018-02-20 09:24:30Z

1

CanvasBitmap.CreateFromSoftwareBitmap method supports BitmapPixelFormat.Bgra8 format. The corresponding CanvasBitmap's Format for BitmapPixelFormat.Bgra8 is DirectXPixelFormat.B8G8R8A8UIntNormalized. According to the Pixel formats of Win2D:

If in doubt, pixel format B8G8R8A8UIntNormalized and CanvasAlphaMode Premultiplied are good defaults for most purposes.

You may need to set the BitmapAlphaMode to Premultiplied with method CreateCopyFromBuffer(IBuffer, BitmapPixelFormat, Int32, Int32, BitmapAlphaMode) when create the SoftwareBitmap to make the format compatible.

SoftwareBitmap outputBitmap = SoftwareBitmap.CreateCopyFromBuffer(b.PixelBuffer, BitmapPixelFormat.Bgra8, b.PixelWidth, b.PixelHeight, BitmapAlphaMode.Premultiplied);

answered Feb 20, 2018 at 9:24

Sunteen Wu

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