Plan 9 from Bell Labs’s /usr/web/sources/contrib/fgb/root/sys/src/ape/X11/cmd/X/mfb/mfbpgbinv.c
#define OPEQ MFB_OPEQ_INVERT #define MFBPOLYGLYPHBLT mfbPolyGlyphBltInvert #include "./mfbplygblt.c"