png_create_write_struct  482 ext/gd/libgd/gd_png.c 	png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, &jbw, gdPngErrorHandler, NULL);
png_create_write_struct  484 ext/gd/libgd/gd_png.c 	png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);