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Determines how the bit values for the source pixels are combined with the bit values for destination pixels to produce the final result. Only a few of these values are usually useful: for colored images, only GDK_COPY, GDK_XOR and GDK_INVERT are generally useful. For bitmaps, GDK_AND and GDK_OR are also useful. Supported modes: GDK_COPY, GDK_INVERT, GDK_XOR, GDK_CLEAR, GDK_AND, GDK_AND_REVERSE, GDK_AND_INVERT, GDK_NOOP, GDK_OR, GDK_EQUIV, GDK_OR_REVERSE, GDK_COPY_INVERT, GDK_OR_INVERT, GDK_NAND, GDK_NOR, GDK_SET |