err_if            127 tests/utils.c      err_if(fwrite(lum_tab, 1, w * h, f) != w * h);
err_if            135 tests/utils.c              err_if(fwrite(cb, 1, w2, f) != w2);
err_if            136 tests/utils.c              err_if(fwrite(cr, 1, w2, f) != w2);
err_if            143 tests/utils.c              err_if(fwrite(cb, 1, w2, f) != w2);
err_if            147 tests/utils.c              err_if(fwrite(cr, 1, w2, f) != w2);