PNG_FLAG_MNG_EMPTY_PLTE  526 pngset.c                   && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0
PNG_FLAG_MNG_EMPTY_PLTE  934 pngwutil.c            !(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) &&
PNG_FLAG_MNG_EMPTY_PLTE 1502 pngwutil.c               (!(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE))) &&