gdImageXbmCtx    2718 gd.c           	_php_image_output_ctx(INTERNAL_FUNCTION_PARAM_PASSTHRU, PHP_GDIMG_TYPE_XBM, "XBM", gdImageXbmCtx);
gdImageXbmCtx     403 libgd/gd.h     void gdImageXbmCtx(gdImagePtr image, char* file_name, int fg, gdIOCtx * out);