/// Applies the opactiy weighting for each pixel in a scanline to the target based on the pattern contained in the brush.
/// Applies the opacity weighting for each pixel in a scanline to the target based on the pattern contained in the brush.
/// </summary>
/// <param name="scanline">The a collection of opacity values between 0 and 1 to be merged with the brushed color value before being applied to the target.</param>
/// <param name="x">The x position in the target pixel space that the start of the scanline data corresponds to.</param>