Windows.UI.Xaml.Media.Imaging.WriteableBitmap.Invalidate C# (CSharp) Méthode

		public extern void Invalidate();
	}

        public unsafe async static Task<WriteableBitmap> ToBitmapImageAsync(this BitmapHolder holder)
        {
            if (holder == null || holder.Pixels == null)
                return null;

            var writeableBitmap = new WriteableBitmap(holder.Width, holder.Height);

            using (var stream = writeableBitmap.PixelBuffer.AsStream())
            {
                int length = holder.Pixels.Length;

                var buffer = new byte[length * 4];
                fixed (int* srcPtr = holder.Pixels)
                {
                    var b = 0;
                    for (var i = 0; i < length; i++, b += 4)
                    {
                        var p = srcPtr[i];
                        buffer[b + 3] = (byte)((p >> 24) & 0xff);
                        buffer[b + 2] = (byte)((p >> 16) & 0xff);
                        buffer[b + 1] = (byte)((p >> 8) & 0xff);
                        buffer[b + 0] = (byte)(p & 0xff);
                    }
                    stream.Write(buffer, 0, length * 4);
                }

            }
            writeableBitmap.Invalidate();

            return writeableBitmap;
        }