Add plymouth splash screen theme

debian/postinst

@@ -27,6 +27,12 @@ case "$1" in
 	    cp /boot/cmdline.txt /boot/cmdline.bak
 	    sed -i 's/console=ttyAMA0,[0-9]* kgdboc=ttyAMA0,[0-9]* //g' /boot/cmdline.txt
         fi
+	#
+	# Make sure UART is enabled
+	#
+	if [ "$(grep enable_uart /boot/config.txt)" = "" ] ; then
+		echo "enable_uart=1" >> /etc/apt/sources.list
+	fi
         #
         # Disable getty on built-in serial port.
         #

share/plymouth/themes/a2pi/a2pi.plymouth

@@ -0,0 +1,8 @@
+[Plymouth Theme]
+Name=a2pi
+Description=Apple II Pi Splash
+ModuleName=script
+
+[script]
+ImageDir=/usr/share/plymouth/themes/a2pi
+ScriptFile=/usr/share/plymouth/themes/a2pi/a2pi.script

share/plymouth/themes/a2pi/a2pi.script

@@ -0,0 +1,50 @@
+screen_width = Window.GetWidth();
+screen_height = Window.GetHeight();
+
+theme_image = Image("splash.png");
+image_width = theme_image.GetWidth();
+image_height = theme_image.GetHeight();
+
+scale_x = image_width / screen_width;
+scale_y = image_height / screen_height;
+
+flag = 1;
+
+if (scale_x > 1 || scale_y > 1)
+{
+	if (scale_x > scale_y)
+	{
+		resized_image = theme_image.Scale (screen_width, image_height / scale_x);
+		image_x = 0;
+		image_y = (screen_height - ((image_height  * screen_width) / image_width)) / 2;
+	}
+	else
+	{
+		resized_image = theme_image.Scale (image_width / scale_y, screen_height);
+		image_x = (screen_width - ((image_width  * screen_height) / image_height)) / 2;
+		image_y = 0;
+	}
+}
+else
+{
+	resized_image = theme_image.Scale (image_width, image_height);
+	image_x = (screen_width - image_width) / 2;
+	image_y = (screen_height - image_height) / 2;
+}
+
+if (Plymouth.GetMode() != "shutdown")
+{
+	sprite = Sprite (resized_image);
+	sprite.SetPosition (image_x, image_y, -100);
+}
+
+message_sprite = Sprite();
+message_sprite.SetPosition(screen_width * 0.1, screen_height * 0.9, 10000);
+
+fun message_callback (text) {
+	my_image = Image.Text(text, 1, 1, 1);
+	message_sprite.SetImage(my_image);
+	sprite.SetImage (resized_image);
+}
+
+Plymouth.SetUpdateStatusFunction(message_callback);