LEVEL_MASK        633 contrib/libtests/pngimage.c    if (level > (error_level)(dp->options & LEVEL_MASK))
LEVEL_MASK       1504 contrib/libtests/pngimage.c          d.options = (d.options & ~LEVEL_MASK) | VERBOSE;
LEVEL_MASK       1507 contrib/libtests/pngimage.c          d.options = (d.options & ~LEVEL_MASK) | WARNINGS;
LEVEL_MASK       1510 contrib/libtests/pngimage.c          d.options = (d.options & ~LEVEL_MASK) | ERRORS;
LEVEL_MASK       1513 contrib/libtests/pngimage.c          d.options = (d.options & ~LEVEL_MASK) | QUIET;