GdkFunction

Determines how the bit values for the source pixels are combined with the bit values for destination pixels to produce the final result. The sixteen values here correspond to the 16 different possible 2x2 truth tables. Only a couple 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. GDK_COPY dst = src GDK_INVERT dst = NOT dst GDK_XOR dst = src XOR dst GDK_CLEAR dst = 0 GDK_AND dst = dst AND src GDK_AND_REVERSE dst = src AND (NOT dst) GDK_AND_INVERT dst = (NOT src) AND dst GDK_NOOP dst = dst GDK_OR dst = src OR dst GDK_EQUIV dst = (NOT src) XOR dst GDK_OR_REVERSE dst = src OR (NOT dst) GDK_COPY_INVERT dst = NOT src GDK_OR_INVERT dst = (NOT src) OR dst GDK_NAND dst = (NOT src) OR (NOT dst) GDK_NOR dst = (NOT src) AND (NOT dst) GDK_SET dst = 1