userboot: provide stub gfx functions

Make sure we have needed functions present, to avoi getting undefined
symbols error(s).

PR: 253088
Reported by: John Kennedy

stand/userboot/userboot/Makefile

@@ -29,13 +29,14 @@ SRCS+=		main.c
 SRCS+=		userboot_cons.c
 SRCS+=		userboot_disk.c
 SRCS+=		vers.c
+SRCS+=		gfx_fb.c
 
 CFLAGS+=	-Wall
 CFLAGS+=	-I${BOOTSRC}/userboot
 CFLAGS.main.c+=	-I${BOOTSRC}/libsa/zfs
 CFLAGS.main.c+=	-I${SYSDIR}/contrib/openzfs/include
 CFLAGS.main.c+=	-I${SYSDIR}/contrib/openzfs/include/os/freebsd/zfs
-CFLAGS.userboot_cons.c+= -I$(SRCTOP)/sys/teken -I${SRCTOP}/contrib/pnglite
+CFLAGS.gfx_fb.c+= -I$(SRCTOP)/sys/teken -I${SRCTOP}/contrib/pnglite
 CWARNFLAGS.main.c += -Wno-implicit-function-declaration
 
 LDFLAGS+=	-nostdlib -Wl,-Bsymbolic

stand/userboot/userboot/gfx_fb.c

@@ -0,0 +1,78 @@
+/*-
+ * Copyright 2021 Toomas Soome <tsoome@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * userboot-specific gfx stubs.
+ */
+
+#include <sys/types.h>
+#include <pnglite.h>
+#include "bootstrap.h"
+#include "gfx_fb.h"
+
+font_list_t fonts = STAILQ_HEAD_INITIALIZER(fonts);
+teken_gfx_t gfx_state = { 0 };
+
+void
+gfx_fb_setpixel(uint32_t x __unused, uint32_t y __unused)
+{
+}
+
+void
+gfx_fb_drawrect(uint32_t x1 __unused, uint32_t y1 __unused,
+    uint32_t x2 __unused, uint32_t y2 __unused, uint32_t fill __unused)
+{
+}
+
+void
+gfx_term_drawrect(uint32_t x1 __unused, uint32_t y1 __unused,
+    uint32_t x2 __unused, uint32_t y2 __unused)
+{
+}
+
+void
+gfx_fb_line(uint32_t x0 __unused, uint32_t y0 __unused,
+    uint32_t x1 __unused, uint32_t y1 __unused, uint32_t w __unused)
+{
+}
+
+void
+gfx_fb_bezier(uint32_t x0 __unused, uint32_t y0 __unused,
+    uint32_t x1 __unused, uint32_t y1 __unused, uint32_t x2 __unused,
+    uint32_t y2 __unused, uint32_t w __unused)
+{
+}
+
+int
+gfx_fb_putimage(png_t *png __unused, uint32_t ux1 __unused,
+    uint32_t uy1 __unused, uint32_t ux2 __unused, uint32_t uy2 __unused,
+    uint32_t flags __unused)
+{
+	return (1);
+}

stand/userboot/userboot/userboot_cons.c

@@ -29,13 +29,9 @@ __FBSDID("$FreeBSD$");
 
 #include <stand.h>
 #include <sys/font.h>
-#include "gfx_fb.h"
 #include "bootstrap.h"
 #include "libuserboot.h"
 
-font_list_t fonts = STAILQ_HEAD_INITIALIZER(fonts);
-teken_gfx_t gfx_state = { 0 };
-
 int console;
 
 static struct console *userboot_comconsp;