AForge.Imaging.Filters.PointedColorFloodFill.ProcessFilter C# (CSharp) Method

        protected unsafe override void ProcessFilter( UnmanagedImage image, Rectangle rect )
        {
            // skip, if there is nothing to fill
            if ( !rect.Contains( startingPoint.X, startingPoint.Y ) )
                return;

            // save bounding rectangle
            startX = rect.Left;
            startY = rect.Top;
            stopX  = rect.Right - 1;
            stopY  = rect.Bottom - 1;

            // save image properties
            scan0 = image.ImageData.ToInt32( );
            stride = image.Stride;

            // create map visited pixels
            checkedPixels = new bool[image.Height, image.Width];

            if ( image.PixelFormat == PixelFormat.Format8bppIndexed )
            {
                byte startColor = *( (byte*) CoordsToPointerGray( startingPoint.X, startingPoint.Y ) );
                minG = (byte) ( Math.Max(   0, startColor - tolerance.G ) );
                maxG = (byte) ( Math.Min( 255, startColor + tolerance.G ) );

                LinearFloodFill4Gray( startingPoint );
            }
            else
            {
                byte* startColor = (byte*) CoordsToPointerRGB( startingPoint.X, startingPoint.Y );

                minR = (byte) ( Math.Max(   0, startColor[RGB.R] - tolerance.R ) );
                maxR = (byte) ( Math.Min( 255, startColor[RGB.R] + tolerance.R ) );
                minG = (byte) ( Math.Max(   0, startColor[RGB.G] - tolerance.G ) );
                maxG = (byte) ( Math.Min( 255, startColor[RGB.G] + tolerance.G ) );
                minB = (byte) ( Math.Max(   0, startColor[RGB.B] - tolerance.B ) );
                maxB = (byte) ( Math.Min( 255, startColor[RGB.B] + tolerance.B ) );

                LinearFloodFill4RGB( startingPoint );
            }
        }