APP_ERROR         646 contrib/libtests/pngimage.c          case APP_ERROR:      lp = "error(pngimage)"; break;
APP_ERROR         722 contrib/libtests/pngimage.c       display_log(dp, APP_ERROR, "read failed: %s", strerror(ret));
APP_ERROR         941 contrib/libtests/pngimage.c       display_log(dp, APP_ERROR, "IHDR changed (%s)", e);
APP_ERROR         962 contrib/libtests/pngimage.c       display_log(dp, APP_ERROR, "PNG rowbytes changed from %lu to %lu",
APP_ERROR        1205 contrib/libtests/pngimage.c                display_log(dp, APP_ERROR, "out of memory saving file");
APP_ERROR        1247 contrib/libtests/pngimage.c       display_log(dp, APP_ERROR, "failed to create write png_struct");