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| const byte | CLEAR = 0 | 
|  | Clear the destination. 
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| const byte | SOURCE = 1 | 
|  | Copy source as-is to the destination. 
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| const byte | DESTINATION = 2 | 
|  | Leave the destination as-is. 
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| const byte | OVER = 3 | 
|  | Copy the source over the destination. 
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| const byte | UNDER = 4 | 
|  | Copy the source under the destination. 
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| const byte | INSIDE = 5 | 
|  | Copy the source to the destination. 
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| const byte | INSIDE_REVERSE = 6 | 
|  | Leave the destination as is. 
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| const byte | OUTSIDE = 7 | 
|  | Copy the source to the destination. 
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| const byte | OUTSIDE_REVERSE = 8 | 
|  | Leave the destination as is. 
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| const byte | ATOP = 9 | 
|  | Copy the source over the destination. 
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| const byte | ATOP_REVERSE = 10 | 
|  | Copy the destination over the source. 
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| const byte | XOR = 11 | 
|  | Combine source and destination by exclusive or. 
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| const byte | ADD = 12 | 
|  | Add source and destination values. 
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| const byte | SATURATE = 13 | 
|  | Saturate source and destination. 
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