private unsafe void ChangeRandomBgColorPixel()
{
using (BitmapBuffer buffer = randomBgSoftwareBitmap.LockBuffer(BitmapBufferAccessMode.Write))
{
using (var reference = buffer.CreateReference())
{
byte *dataInBytes;
uint capacity;
((IMemoryBufferByteAccess)reference).GetBuffer(out dataInBytes, out capacity);
// Fill-in the BGRA plane
BitmapPlaneDescription bufferLayout = buffer.GetPlaneDescription(0);
double imgWidth = bufferLayout.Width;
double imgHeight = bufferLayout.Height;
for (int row = 0; row < imgHeight; row++)
{
for (int col = 0; col < imgWidth; col++)
{
double hue = col * (360 / imgWidth);
HSVColor hsv = new HSVColor(hue, 1.0, 1.0);
Color color = hsv.GetRGB();
int pixelIndex = bufferLayout.Stride * row + 4 * col;
if (dataInBytes[pixelIndex + 3] != 0)
{
dataInBytes[pixelIndex + 0] = (byte)color.B;
dataInBytes[pixelIndex + 1] = (byte)color.G;
dataInBytes[pixelIndex + 2] = (byte)color.R;
}
}
}
}
}
}