checkopaque      3146 contrib/libtests/pngstest.c          return checkopaque(image);
checkopaque      3247 contrib/libtests/pngstest.c                if (!checkopaque(image))
checkopaque      3281 contrib/libtests/pngstest.c          if (!checkopaque(image))
checkopaque      3324 contrib/libtests/pngstest.c    checkopaque(image);