LINEINFO Field - usBackROP

 usBackROP (USHORT) 
    Line Background mix. 

    The following flags apply to ulForeROP and ulBackROP: 

    LR_ZERO        
    LR_INVERTMERGEPAT   
    LR_MASKINVERTPAT   
    LR_INVERTCOPYPAT   
    LR_MASKPATINVERT   
    LR_INVERT      
    LR_XORPAT      
    LR_INVERTMASKPAT   
    LR_MASKPAT     
    LR_INVERTXORPAT   
    LR_LEAVEALONE   
    LR_MERGEINVERTPAT   
    LR_PATCOPY     
    LR_MERGEPATINVERT   
    LR_MERGEPAT    
    LR_ONE