Add GfxCanvas as buildroot package

Config.in

@@ -2,5 +2,6 @@ menu "RPI Common packages"
 
 source "$BR2_EXTERNAL_RPI_COMMON_PATH/package/my-shared-lib/Config.in"
 source "$BR2_EXTERNAL_RPI_COMMON_PATH/package/my-common-tool/Config.in"
+source "$BR2_EXTERNAL_RPI_COMMON_PATH/package/gfxcanvas/Config.in"
 
 endmenu

configs/raspberrypi_common_defconfig

@@ -56,3 +56,4 @@ BR2_PACKAGE_HOST_DOSFSTOOLS=y
 BR2_PACKAGE_HOST_GENIMAGE=y
 BR2_PACKAGE_HOST_KMOD_XZ=y
 BR2_PACKAGE_HOST_MTOOLS=y
+BR2_PACKAGE_GFXCANVAS=y

package/gfxcanvas/Config.in

@@ -0,0 +1,14 @@
+config BR2_PACKAGE_GFXCANVAS
+	bool "gfxcanvas"
+	depends on BR2_INSTALL_LIBSTDCPP
+	depends on BR2_TOOLCHAIN_GCC_AT_LEAST_13
+	help
+	  Small C++ framebuffer graphics application that draws an
+	  info screen (date/time, hostname, network addresses) on a
+	  Linux framebuffer device. Intended for SSD1306-class OLEDs
+	  exposed as /dev/fbN via fbtft.
+
+	  https://git.gmlima.com/Gabriel/GfxCanvas
+
+comment "gfxcanvas needs a toolchain w/ C++, gcc >= 13"
+	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_GCC_AT_LEAST_13

package/gfxcanvas/S99gfxcanvas

@@ -0,0 +1,60 @@
+#!/bin/sh
+#
+# Start gfxcanvas info display
+#
+
+DAEMON="gfxcanvas"
+DAEMON_PATH="/usr/bin/$DAEMON"
+DAEMON_ARGS="/dev/fb1"
+PIDFILE="/var/run/$DAEMON.pid"
+
+start() {
+	printf 'Starting %s: ' "$DAEMON"
+	# shellcheck disable=SC2086
+	start-stop-daemon -S -q -m -b -p "$PIDFILE" \
+		-x "$DAEMON_PATH" -- $DAEMON_ARGS
+	status=$?
+	if [ "$status" -eq 0 ]; then
+		echo "OK"
+	else
+		echo "FAIL"
+	fi
+	return "$status"
+}
+
+stop() {
+	printf 'Stopping %s: ' "$DAEMON"
+	start-stop-daemon -K -q -p "$PIDFILE"
+	status=$?
+	if [ "$status" -eq 0 ]; then
+		rm -f "$PIDFILE"
+		echo "OK"
+	else
+		echo "FAIL"
+	fi
+	return "$status"
+}
+
+restart() {
+	stop
+	sleep 1
+	start
+}
+
+case "$1" in
+	start)
+		start
+		;;
+	stop)
+		stop
+		;;
+	restart|reload)
+		restart
+		;;
+	*)
+		echo "Usage: $0 {start|stop|restart}"
+		exit 1
+		;;
+esac
+
+exit $?

package/gfxcanvas/gfxcanvas.mk

@@ -0,0 +1,20 @@
+################################################################################
+#
+# gfxcanvas
+#
+################################################################################
+
+GFXCANVAS_VERSION = 0.1
+GFXCANVAS_SITE = https://git.gmlima.com/Gabriel/GfxCanvas.git
+GFXCANVAS_SITE_METHOD = git
+GFXCANVAS_LICENSE = GPL-3.0
+GFXCANVAS_LICENSE_FILES = LICENSE
+
+GFXCANVAS_CONF_OPTS = -DPROJECT_NAME=gfxcanvas
+
+define GFXCANVAS_INSTALL_INIT_SYSV
+	$(INSTALL) -D -m 0755 $(GFXCANVAS_PKGDIR)/S99gfxcanvas \
+		$(TARGET_DIR)/etc/init.d/S99gfxcanvas
+endef
+
+$(eval $(cmake-package))