PixelArray<BGRAb> CreateAlphaMask(int width, int height)
{
PixelArray<BGRAb> alphaMask = new PixelArray<BGRAb>(width, height);
for (int row = 0; row < height; row++)
for (int column = 0; column < width; column++)
{
BGRAb pixel = alphaMask.RetrievePixel(column, row);
float fraction = (float)column / copyBuffer.Width;
pixel.Alpha = (byte)(255 - fraction * 255);
alphaMask.AssignPixel(column, row, pixel);
}
return alphaMask;
}
unsafe public static PixelArray<Lumb> Copy(PixelArray<Lumb> dst, GDIDIBSection src)
{
if (dst.Orientation != src.Orientation)
return null;
int imageSize = src.Width * src.Height;
Lumb* dstPointer = (Lumb*)dst.Pixels.ToPointer();
BGRb* srcPointer = (BGRb*)src.Pixels.ToPointer();
for (int y = 0; y < src.Height; y++)
for (int x = 0; x < src.Width; x++)
{
dst.AssignPixel(x, y, new Lumb(NTSCGray.ToLuminance(*srcPointer)));
}
return dst;
}