BitMiracle.LibTiff.Classic.TiffRgbaImage.putcontig8bitYCbCr42tile C# (CSharp) Method

        private static void putcontig8bitYCbCr42tile(
            TiffRgbaImage img, int[] raster, int rasterOffset, int rasterShift,
            int x, int y, int width, int height, byte[] buffer, int offset, int bufferShift)
        {
            int rasterOffset2 = rasterOffset + width + rasterShift;
            int incr = 2 * rasterShift + width;

            bufferShift = (bufferShift * 10) / 4;
            if ((height & 3) == 0 && (width & 1) == 0)
            {
                for (; height >= 2; height -= 2)
                {
                    x = width >> 2;
                    do
                    {
                        int Cb = buffer[offset + 8];
                        int Cr = buffer[offset + 9];

                        img.YCbCrtoRGB(out raster[rasterOffset + 0], buffer[offset + 0], Cb, Cr);
                        img.YCbCrtoRGB(out raster[rasterOffset + 1], buffer[offset + 1], Cb, Cr);
                        img.YCbCrtoRGB(out raster[rasterOffset + 2], buffer[offset + 2], Cb, Cr);
                        img.YCbCrtoRGB(out raster[rasterOffset + 3], buffer[offset + 3], Cb, Cr);
                        img.YCbCrtoRGB(out raster[rasterOffset2 + 0], buffer[offset + 4], Cb, Cr);
                        img.YCbCrtoRGB(out raster[rasterOffset2 + 1], buffer[offset + 5], Cb, Cr);
                        img.YCbCrtoRGB(out raster[rasterOffset2 + 2], buffer[offset + 6], Cb, Cr);
                        img.YCbCrtoRGB(out raster[rasterOffset2 + 3], buffer[offset + 7], Cb, Cr);

                        rasterOffset += 4;
                        rasterOffset2 += 4;
                        offset += 10;
                    }
                    while (--x != 0);

                    rasterOffset += incr;
                    rasterOffset2 += incr;
                    offset += bufferShift;
                }
            }
            else
            {
                while (height > 0)
                {
                    for (x = width; x > 0; )
                    {
                        int Cb = buffer[offset + 8];
                        int Cr = buffer[offset + 9];

                        bool x_goOn = false;
                        if (x < 1 || x > 3)
                        {
                            if (height != 1)
                                img.YCbCrtoRGB(out raster[rasterOffset2 + 3], buffer[offset + 7], Cb, Cr);

                            img.YCbCrtoRGB(out raster[rasterOffset + 3], buffer[offset + 3], Cb, Cr);
                            x_goOn = true;
                        }

                        if (x == 3 || x_goOn)
                        {
                            if (height != 1)
                                img.YCbCrtoRGB(out raster[rasterOffset2 + 2], buffer[offset + 6], Cb, Cr);

                            img.YCbCrtoRGB(out raster[rasterOffset + 2], buffer[offset + 2], Cb, Cr);
                            x_goOn = true;
                        }

                        if (x == 2 || x_goOn)
                        {
                            if (height != 1)
                                img.YCbCrtoRGB(out raster[rasterOffset2 + 1], buffer[offset + 5], Cb, Cr);

                            img.YCbCrtoRGB(out raster[rasterOffset + 1], buffer[offset + 1], Cb, Cr);
                            x_goOn = true;
                        }

                        if (x == 1 || x_goOn)
                        {
                            if (height != 1)
                                img.YCbCrtoRGB(out raster[rasterOffset2 + 0], buffer[offset + 4], Cb, Cr);

                            img.YCbCrtoRGB(out raster[rasterOffset + 0], buffer[offset + 0], Cb, Cr);
                        }

                        if (x < 4)
                        {
                            rasterOffset += x;
                            rasterOffset2 += x;
                            x = 0;
                        }
                        else
                        {
                            rasterOffset += 4;
                            rasterOffset2 += 4;
                            x -= 4;
                        }

                        offset += 10;
                    }

                    if (height <= 2)
                        break;

                    height -= 2;
                    rasterOffset += incr;
                    rasterOffset2 += incr;
                    offset += bufferShift;
                }
            }
        }