uint32_t blue = 0, red = 0 , green = 0, alpha = 0, factor = 0 , shift = 0;

    // some initial calculation to calculate factor shift and R G B init values all are expected to be initilized with 16 bit unsigned

    //pSRC is 32 bbp flat pixel array and count is total pixels count

     for( int i = 0; i < count; i++ )
     {
        blue  += *psrc++;
        green += *psrc++;
        green += *psrc++;
        alpha += *psrc++;

        *pDest++ = static_cast< uint_8 >( ( blue * factor ) >> shift );
        *pDest++ = static_cast< uint_8 >( ( green * factor ) >> shift );
        *pDest++ = static_cast< uint_8 >( ( red * factor ) >> shift );
        *pDest++ = static_cast< uint_8 >( ( alpha * factor ) >> shift );
     }