PIXEL_MASK       2915 3rdparty/libpng/pngrutil.c #        define S_MASKx(p,x,d,s) (S_COPY(p,x)?PIXEL_MASK(p,x,d,s):0)
PIXEL_MASK       2916 3rdparty/libpng/pngrutil.c #        define B_MASKx(p,x,d,s) (B_COPY(p,x)?PIXEL_MASK(p,x,d,s):0)