LIBPNG_ERROR      644 contrib/libtests/pngimage.c          case LIBPNG_ERROR:   lp = "error(libpng)"; break;
LIBPNG_ERROR      695 contrib/libtests/pngimage.c    display_log(dp, LIBPNG_ERROR, "%s", error);
LIBPNG_ERROR      801 contrib/libtests/pngimage.c       display_log(dp, LIBPNG_ERROR, "failed to create read struct");
LIBPNG_ERROR      808 contrib/libtests/pngimage.c       display_log(dp, LIBPNG_ERROR, "failed to create info struct");
LIBPNG_ERROR     1056 contrib/libtests/pngimage.c                display_log(dp, LIBPNG_ERROR, "invalid colour type %d",