for(ulIdx1 = 0; ulIdx1 < 6; ulIdx1 += 2)                       
        {

            for(ulIdx2 = 0; ulIdx2 < 8; ulIdx2++)                     
            {
                g_pucBuffer[ulIdx2] = 0;                              
                if(g_pucFont[ucTemp][ulIdx1] & (1 << ulIdx2))            
                {                                                        
                    g_pucBuffer[ulIdx2] = (ucLevel << 4) & 0xf0;        
                }
                if((ulIdx1 < 4) &&                                       
                   (g_pucFont[ucTemp][ulIdx1 + 1] & (1 << ulIdx2)))        
                {
                    g_pucBuffer[ulIdx2] |= (ucLevel << 0) & 0x0f;        
                }                                                        
            }
                                                                        

            RITWriteData(g_pucBuffer, 8);
            ulX += 2;


            if(ulX == 128)
            {
                return;
            }
        }

这个是一个液晶显示函数中的一段代码，g_pucFont数组中的值g_pucFont[40][]={0xef,0x08,0x08,0x08,0xef}赋给 g_pucBuffer ,
这段代码是如何通过两个if语句做到的呢?