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Drawing (BITBLT) functions. 
 
 - Enumeration values: 
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| BLT_CLR  | 
D := 0.  |  
| BLT_SRC_AND_DST  | 
D := S & D.  |  
| BLT_SRC_AND_NOT_DST  | 
D := S & ~D.  |  
| BLT_SRC  | 
D := S.  |  
| BLT_NOT_SRC_AND_DST  | 
D := ~S & D.  |  
| BLT_DST  | 
D := D.  |  
| BLT_SRC_XOR_DST  | 
D := S ^ D.  |  
| BLT_SRC_OR_DST  | 
D := S | D.  |  
| BLT_NOT_SRC_AND_NOT_DST  | 
D := ~S & ~D == D := ~(S | D).  |  
| BLT_NOT_SRC_XOR_DST  | 
D := ~S ^ D.  |  
| BLT_NOT_DST  | 
D := ~D.  |  
| BLT_SRC_OR_NOT_DST  | 
D := S | ~D.  |  
| BLT_NOT_SRC  | 
D := ~S.  |  
| BLT_NOT_SRC_OR_DST  | 
D := ~S | D.  |  
| BLT_NOT_SRC_OR_NOT_DST  | 
D := ~S | ~D == ~(S & D).  |  
| BLT_SET  | 
D := 1.  |  
 
  
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