GdkFunctionGdkFunctionEnums
 Value | Symbolic name | Description |  |   0 | GDK_COPY | 
   |  |   1 | GDK_INVERT | 
   |  |   2 | GDK_XOR | 
   |  |   3 | GDK_CLEAR | 
   |  |   4 | GDK_AND | 
   |  |   5 | GDK_AND_REVERSE | 
   |  |   6 | GDK_AND_INVERT | 
   |  |   7 | GDK_NOOP | 
   |  |   8 | GDK_OR | 
   |  |   9 | GDK_INVERT | 
   |  |   10 | GDK_XOR | 
   |  |   11 | GDK_EQUIV | 
   |  |   12 | GDK_OR_REVERSE | 
   |  |   13 | GDK_COPY_INVERT | 
   |  |   14 | GDK_OR_INVERT | 
   |  |   15 | GDK_NAND | 
   |  |   16 | GDK_SET | 
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