wacom: Add OLED handling for Intuos4

https://bugzilla.gnome.org/show_bug.cgi?id=671072

configure.ac

@@ -53,6 +53,7 @@ UPOWER_GLIB_REQUIRED_VERSION=0.9.1
 PA_REQUIRED_VERSION=2.0
 LIBWACOM_REQUIRED_VERSION=0.7
 LIBRSVG_REQUIRED_VERSION=2.36.2
+PANGO_REQUIRED_VERSION=1.20.0
 UPOWER_REQUIRED_VERSION=0.9.11
 IBUS_REQUIRED_VERSION=1.4.99
 GSETTINGS_DESKTOP_SCHEMAS_REQUIRED_VERSION=3.7.2.1
@@ -253,8 +254,8 @@ case $host_os in
       have_wacom=no
     else
       if test x$enable_gudev != xno; then
-        PKG_CHECK_MODULES(WACOM, [libwacom >= $LIBWACOM_REQUIRED_VERSION x11 xi xtst gudev-1.0 gnome-desktop-3.0 >= $GNOME_DESKTOP_REQUIRED_VERSION xorg-wacom librsvg-2.0 >= $LIBRSVG_REQUIRED_VERSION libnotify >= $LIBNOTIFY_REQUIRED_VERSION
-])
+        PKG_CHECK_MODULES(WACOM, [libwacom >= $LIBWACOM_REQUIRED_VERSION x11 xi xtst gudev-1.0 gnome-desktop-3.0 >= $GNOME_DESKTOP_REQUIRED_VERSION xorg-wacom librsvg-2.0 >= $LIBRSVG_REQUIRED_VERSION libnotify >= $LIBNOTIFY_REQUIRED_VERSION pango >= $PANGO_REQUIRED_VERSION])
+        PKG_CHECK_MODULES(WACOM_OLED, [gudev-1.0])
       else
         AC_MSG_ERROR([GUdev is necessary to compile Wacom support])
       fi

data/org.gnome.settings-daemon.peripherals.wacom.gschema.xml.in.in

@@ -107,5 +107,10 @@
       <_summary>Key combinations for a touchring or touchstrip custom action</_summary>
       <_description>The keyboard shortcuts generated when a touchring or touchstrip is used for custom actions (up followed by down).</_description>
     </key>
+    <key name="oled-label" type="s">
+      <default>''</default>
+      <_summary>Button label for OLED display.</_summary>
+      <_description>Label will be rendered to OLED display belonging to the button</_description>
+    </key>
   </schema>
 </schemalist>

plugins/wacom/Makefile.am

@@ -8,6 +8,8 @@ libgsdwacom_la_SOURCES =	\
 	gsd-wacom-manager.c	\
 	gsd-wacom-osd-window.h	\
 	gsd-wacom-osd-window.c	\
+	gsd-wacom-oled.h	\
+	gsd-wacom-oled.c	\
 	gsd-wacom-device.c	\
 	gsd-wacom-device.h	\
 	gsd-wacom-resources.c
@@ -52,18 +54,27 @@ polkit_policy_DATA = $(polkit_policy_in_files:.policy.in=.policy)
 
 # so it always gets included in the tarball
 gsd_wacom_led_helper_SOURCES =	gsd-wacom-led-helper.c
+gsd_wacom_oled_helper_SOURCES =	gsd-wacom-oled-helper.c
 
-EXTRA_DIST = $(gsd_wacom_led_helper_SOURCES) wacom.gresource.xml tablet-layout.css
+EXTRA_DIST = $(gsd_wacom_led_helper_SOURCES) wacom.gresource.xml tablet-layout.css \
+	     $(gsd_wacom_oled_helper_SOURCES)
 
 if HAVE_GUDEV
-libexec_PROGRAMS = gsd-wacom-led-helper
+libexec_PROGRAMS = gsd-wacom-led-helper gsd-wacom-oled-helper
 
 gsd_wacom_led_helper_LDFLAGS =				\
 	$(BACKLIGHT_HELPER_LIBS)			\
 	-lm
 
+gsd_wacom_oled_helper_LDFLAGS =				\
+	$(WACOM_OLED_LIBS)				\
+	-lm
+
 gsd_wacom_led_helper_CFLAGS =				\
 	$(BACKLIGHT_HELPER_CFLAGS)
+
+gsd_wacom_oled_helper_CFLAGS =				\
+	$(WACOM_OLED_CFLAGS)
 else
 libexec_PROGRAMS =
 endif
@@ -78,6 +89,8 @@ gsd_test_wacom_SOURCES =	\
 	gsd-wacom-manager.h	\
 	gsd-wacom-osd-window.h	\
 	gsd-wacom-osd-window.c	\
+	gsd-wacom-oled.h	\
+	gsd-wacom-oled.c	\
 	gsd-wacom-device.c	\
 	gsd-wacom-device.h	\
 	gsd-wacom-resources.c

plugins/wacom/gsd-wacom-device.c

@@ -258,7 +258,8 @@ gsd_wacom_tablet_button_new (const char               *name,
 			     GsdWacomTabletButtonPos   pos,
 			     int                       group_id,
 			     int                       idx,
-			     int                       status_led)
+			     int                       status_led,
+			     int                       has_oled)
 {
 	GsdWacomTabletButton *ret;
 
@@ -277,6 +278,7 @@ gsd_wacom_tablet_button_new (const char               *name,
 	ret->type = type;
 	ret->pos = pos;
 	ret->status_led = status_led;
+	ret->has_oled = has_oled;
 
 	return ret;
 }
@@ -1080,7 +1082,8 @@ gsd_wacom_device_add_ring_modes (WacomDevice      *wacom_device,
 									   WACOM_TABLET_BUTTON_POS_LEFT,
 									   group,
 									   0,
-									   GSD_WACOM_NO_LED));
+									   GSD_WACOM_NO_LED,
+									   0));
 		} else {
 			for (i = 1; i <= num_modes; i++) {
 				name = g_strdup_printf (_("Left Ring Mode #%d"), i);
@@ -1092,7 +1095,8 @@ gsd_wacom_device_add_ring_modes (WacomDevice      *wacom_device,
 										   WACOM_TABLET_BUTTON_POS_LEFT,
 				                                                   group,
 				                                                   i - 1,
-										   GSD_WACOM_NO_LED));
+										   GSD_WACOM_NO_LED,
+										   0));
 				g_free (name);
 				g_free (id);
 			}
@@ -1109,7 +1113,8 @@ gsd_wacom_device_add_ring_modes (WacomDevice      *wacom_device,
 									   WACOM_TABLET_BUTTON_POS_RIGHT,
 									   group,
 									   0,
-									   GSD_WACOM_NO_LED));
+									   GSD_WACOM_NO_LED,
+									   0));
 		} else {
 			for (i = 1; i <= num_modes; i++) {
 				name = g_strdup_printf (_("Right Ring Mode #%d"), i);
@@ -1121,7 +1126,8 @@ gsd_wacom_device_add_ring_modes (WacomDevice      *wacom_device,
 										   WACOM_TABLET_BUTTON_POS_RIGHT,
 				                                                   group,
 				                                                   i - 1,
-										   GSD_WACOM_NO_LED));
+										   GSD_WACOM_NO_LED,
+										   0));
 				g_free (name);
 				g_free (id);
 			}
@@ -1160,7 +1166,8 @@ gsd_wacom_device_add_strip_modes (WacomDevice      *wacom_device,
 									   WACOM_TABLET_BUTTON_POS_LEFT,
 									   group,
 									   0,
-									   GSD_WACOM_NO_LED));
+									   GSD_WACOM_NO_LED,
+									   0));
 		} else {
 			for (i = 1; i <= num_modes; i++) {
 				name = g_strdup_printf (_("Left Touchstrip Mode #%d"), i);
@@ -1172,7 +1179,8 @@ gsd_wacom_device_add_strip_modes (WacomDevice      *wacom_device,
 										   WACOM_TABLET_BUTTON_POS_LEFT,
 				                                                   group,
 				                                                   i - 1,
-										   GSD_WACOM_NO_LED));
+										   GSD_WACOM_NO_LED,
+										   0));
 				g_free (name);
 				g_free (id);
 			}
@@ -1189,7 +1197,8 @@ gsd_wacom_device_add_strip_modes (WacomDevice      *wacom_device,
 									   WACOM_TABLET_BUTTON_POS_RIGHT,
 									   group,
 									   0,
-									   GSD_WACOM_NO_LED));
+									   GSD_WACOM_NO_LED,
+									   0));
 		} else {
 			for (i = 1; i <= num_modes; i++) {
 				name = g_strdup_printf (_("Right Touchstrip Mode #%d"), i);
@@ -1201,7 +1210,8 @@ gsd_wacom_device_add_strip_modes (WacomDevice      *wacom_device,
 										   WACOM_TABLET_BUTTON_POS_RIGHT,
 				                                                   group,
 				                                                   i - 1,
-										   GSD_WACOM_NO_LED));
+										   GSD_WACOM_NO_LED,
+										   0));
 				g_free (name);
 				g_free (id);
 			}
@@ -1259,6 +1269,7 @@ gsd_wacom_device_add_buttons_dir (WacomDevice      *wacom_device,
 	GList *l;
 	guint num_buttons, i, button_num;
 	char *name, *id;
+	gboolean has_oled;
 
 	l = NULL;
 	button_num = 1;
@@ -1275,6 +1286,8 @@ gsd_wacom_device_add_buttons_dir (WacomDevice      *wacom_device,
 
 		name = g_strdup_printf (button_str, button_num++);
 		id = g_strdup_printf ("%s%c", button_str_id, i);
+		if (libwacom_get_button_flag (wacom_device, i) & WACOM_BUTTON_OLED)
+			has_oled = TRUE;
 		l = g_list_append (l, gsd_wacom_tablet_button_new (name,
 		                                                   id,
 		                                                   settings_path,
@@ -1282,7 +1295,8 @@ gsd_wacom_device_add_buttons_dir (WacomDevice      *wacom_device,
 		                                                   gsd_wacom_device_button_pos (flags),
 		                                                   flags_to_group (flags),
 		                                                   -1,
-		                                                   GSD_WACOM_NO_LED));
+								   GSD_WACOM_NO_LED,
+								   has_oled));
 		g_free (name);
 		g_free (id);
 	}
@@ -1310,7 +1324,8 @@ gsd_wacom_device_add_buttons_dir (WacomDevice      *wacom_device,
 		                                                   gsd_wacom_device_button_pos (flags),
 		                                                   flags_to_group (flags),
 		                                                   -1,
-		                                                   status_led));
+		                                                   status_led,
+								   FALSE));
 		g_free (name);
 		g_free (id);
 	}

plugins/wacom/gsd-wacom-device.h

@@ -123,6 +123,7 @@ typedef struct
 	GsdWacomTabletButtonPos   pos;
 	int                       group_id, idx;
 	int                       status_led;
+	int                       has_oled;
 } GsdWacomTabletButton;
 
 void                  gsd_wacom_tablet_button_free (GsdWacomTabletButton *button);

plugins/wacom/gsd-wacom-manager.c

@@ -49,6 +49,7 @@
 #include "gnome-settings-profile.h"
 #include "gsd-wacom-manager.h"
 #include "gsd-wacom-device.h"
+#include "gsd-wacom-oled.h"
 #include "gsd-wacom-osd-window.h"
 
 #define GSD_WACOM_MANAGER_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GSD_TYPE_WACOM_MANAGER, GsdWacomManagerPrivate))
@@ -68,9 +69,10 @@
 #define KEY_PRESSURECURVE       "pressurecurve"
 
 /* Button settings */
-#define KEY_ACTION_TYPE         "action-type"
-#define KEY_CUSTOM_ACTION       "custom-action"
+#define KEY_ACTION_TYPE            "action-type"
+#define KEY_CUSTOM_ACTION          "custom-action"
 #define KEY_CUSTOM_ELEVATOR_ACTION "custom-elevator-action"
+#define OLED_LABEL                 "oled-label"
 
 /* See "Wacom Pressure Threshold" */
 #define DEFAULT_PRESSURE_THRESHOLD 27
@@ -701,7 +703,7 @@ reset_pad_buttons (GsdWacomDevice *device)
 
 	XCloseDevice (GDK_DISPLAY_XDISPLAY (gdk_display_get_default ()), xdev);
 
-	/* Reset all the LEDs */
+	/* Reset all the LEDs and OLEDs*/
 	buttons = gsd_wacom_device_get_buttons (device);
 	for (l = buttons; l != NULL; l = l->next) {
 		GsdWacomTabletButton *button = l->data;
@@ -709,16 +711,36 @@ reset_pad_buttons (GsdWacomDevice *device)
                     button->status_led != GSD_WACOM_NO_LED) {
                         set_led (device, button, 1);
                 }
-        }
+		if (button->has_oled) {
+			char *label;
+			label = g_settings_get_string (button->settings, OLED_LABEL);
+			set_oled (device, button->id, label);
+			g_free (label);
+		}
+	}
         g_list_free (buttons);
 }
 
+static void
+gsettings_oled_changed (GSettings *settings,
+			gchar *key,
+			GsdWacomTabletButton *button)
+{
+	GsdWacomDevice *device;
+	char *label;
+
+	label = g_settings_get_string (settings, OLED_LABEL);
+	device = g_object_get_data (G_OBJECT (button->settings), "parent-device");
+	set_oled (device, button->id, label);
+}
+
 static void
 set_wacom_settings (GsdWacomManager *manager,
 		    GsdWacomDevice  *device)
 {
 	GsdWacomDeviceType type;
 	GSettings *settings;
+	GList *buttons, *l;
 
 	g_debug ("Applying settings for device '%s' (type: %s)",
 		 gsd_wacom_device_get_tool_name (device),
@@ -756,6 +778,18 @@ set_wacom_settings (GsdWacomManager *manager,
 		id = get_device_id (device);
 		reset_pad_buttons (device);
 		grab_button (id, TRUE, manager->priv->screen);
+
+		buttons = gsd_wacom_device_get_buttons (device);
+		for (l = buttons; l != NULL; l = l->next) {
+			GsdWacomTabletButton *button = l->data;
+			if (button->has_oled) {
+				g_signal_connect (G_OBJECT (button->settings), "changed::oled-label",
+						  G_CALLBACK (gsettings_oled_changed), button);
+				g_object_set_data (G_OBJECT (button->settings), "parent-device", device);
+			}
+		}
+		g_list_free (buttons);
+
 		return;
 	}
 

plugins/wacom/gsd-wacom-oled-helper.c

+/*
+ * Copyright (C) 2012      Przemo Firszt <przemo@firszt.eu>
+ *
+ * The code is derived from gsd-wacom-led-helper.c
+ * written by:
+ * Copyright (C) 2010-2011 Richard Hughes <richard@hughsie.com>
+ * Copyright (C) 2012      Bastien Nocera <hadess@hadess.net>
+ *
+ * Licensed under the GNU General Public License Version 2
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#include <unistd.h>
+
+#include <stdlib.h>
+#include "config.h"
+
+#include <glib.h>
+#include <locale.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <gudev/gudev.h>
+
+static gboolean
+gsd_wacom_oled_helper_write (const gchar *filename, gchar *buffer, GError **error)
+{
+	guchar *image;
+	gint retval;
+	gsize length;
+	gint fd = -1;
+	gboolean ret = TRUE;
+
+	fd = open (filename, O_WRONLY);
+	if (fd < 0) {
+		ret = FALSE;
+		g_set_error (error, 1, 0, "failed to open filename: %s", filename);
+		goto out;
+	}
+
+	image = g_base64_decode (buffer, &length);
+	if (!image)
+		goto out;
+
+	/* write to device file */
+	retval = write (fd, image, length);
+	if (retval != length) {
+		ret = FALSE;
+		g_set_error (error, 1, 0, "writing to %s failed", filename);
+		goto out;
+	}
+out:
+	if (fd >= 0)
+		close (fd);
+	g_free (image);
+	return ret;
+}
+
+static char *
+get_oled_sysfs_path (GUdevDevice *device,
+		    int          button_num)
+{
+	char *status;
+	char *filename;
+
+	status = g_strdup_printf ("button%d_rawimg", button_num);
+	filename = g_build_filename (g_udev_device_get_sysfs_path (device), "wacom_led", status, NULL);
+	g_free (status);
+
+	return filename;
+}
+
+static char *path = NULL;
+static char *buffer = "";
+static int button_num = -1;
+
+const GOptionEntry options[] = {
+	{ "path", '\0', 0, G_OPTION_ARG_FILENAME, &path, "Device path for the Wacom device", NULL },
+	{ "buffer", '\0', 0, G_OPTION_ARG_STRING, &buffer, "Image to set base64 encoded", NULL },
+	{ "button", '\0', 0, G_OPTION_ARG_INT, &button_num, "Which button icon to set", NULL },
+	{ NULL}
+};
+
+
+int main (int argc, char **argv)
+{
+	GOptionContext *context;
+	GUdevClient *client;
+	GUdevDevice *device, *parent;
+	int uid, euid;
+	char *filename;
+	GError *error = NULL;
+	const char * const subsystems[] = { "input", NULL };
+
+	/* get calling process */
+	uid = getuid ();
+	euid = geteuid ();
+	if (uid != 0 || euid != 0) {
+		g_print ("This program can only be used by the root user\n");
+		return 1;
+	}
+
+	context = g_option_context_new (NULL);
+	g_option_context_set_summary (context, "GNOME Settings Daemon Wacom OLED Icon Helper");
+	g_option_context_add_main_entries (context, options, NULL);
+	g_option_context_parse (context, &argc, &argv, NULL);
+
+	if (path == NULL ||
+	    button_num < 0) {
+		char *txt;
+
+		txt = g_option_context_get_help (context, FALSE, NULL);
+		g_print ("%s", txt);
+		g_free (txt);
+
+		g_option_context_free (context);
+
+		return 1;
+	}
+	g_option_context_free (context);
+
+	client = g_udev_client_new (subsystems);
+	device = g_udev_client_query_by_device_file (client, path);
+	if (device == NULL) {
+		g_debug ("Could not find device '%s' in udev database", path);
+		goto bail;
+	}
+
+	if (g_udev_device_get_property_as_boolean (device, "ID_INPUT_TABLET") == FALSE &&
+	    g_udev_device_get_property_as_boolean (device, "ID_INPUT_TOUCHPAD") == FALSE) {
+		g_debug ("Device '%s' is not a Wacom tablet", path);
+		goto bail;
+	}
+
+	if (g_strcmp0 (g_udev_device_get_property (device, "ID_BUS"), "usb") != 0) {
+		/* FIXME handle Bluetooth OLEDs too */
+		g_debug ("Non-USB OLEDs setting is not (yet) supported");
+		goto bail;
+	}
+
+	parent = g_udev_device_get_parent_with_subsystem (device, "usb", "usb_interface");
+	if (parent == NULL) {
+		g_debug ("Could not find parent USB device for '%s'", path);
+		goto bail;
+	}
+	g_object_unref (device);
+	device = parent;
+
+	filename = get_oled_sysfs_path (device, button_num);
+	if (gsd_wacom_oled_helper_write (filename, buffer, &error) == FALSE) {
+		g_debug ("Could not set OLED icon for '%s': %s", path, error->message);
+		g_error_free (error);
+		g_free (filename);
+		goto bail;
+	}
+	g_free (filename);
+
+	g_debug ("Successfully set OLED icon for '%s', button %d", path, button_num);
+
+	g_object_unref (device);
+	g_object_unref (client);
+
+	return 0;
+
+bail:
+	if (device != NULL)
+		g_object_unref (device);
+	if (client != NULL)
+		g_object_unref (client);
+	return 1;
+}

plugins/wacom/gsd-wacom-oled.c

+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2013 Przemo Firszt <przemo@firszt.eu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ */
+
+#include <unistd.h>
+#include <math.h>
+#include <pango/pango.h>
+#include <pango/pangocairo.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <libwacom/libwacom.h>
+
+#include <gtk/gtk.h>
+#include "gsd-wacom-device.h"
+#include "gsd-wacom-oled.h"
+
+static void
+oled_scramble_icon (guchar* image)
+{
+	unsigned char buf[MAX_IMAGE_SIZE];
+	int x, y, i;
+	unsigned char l1, l2, h1, h2;
+
+	for (i = 0; i < MAX_IMAGE_SIZE; i++)
+		buf[i] = image[i];
+
+	for (y = 0; y < (OLED_HEIGHT / 2); y++) {
+		for (x = 0; x < (OLED_WIDTH / 2); x++) {
+			l1 = (0x0F & (buf[OLED_HEIGHT - 1 - x + OLED_WIDTH * y]));
+			l2 = (0x0F & (buf[OLED_HEIGHT - 1 - x + OLED_WIDTH * y] >> 4));
+			h1 = (0xF0 & (buf[OLED_WIDTH - 1 - x + OLED_WIDTH * y] << 4));
+			h2 = (0xF0 & (buf[OLED_WIDTH - 1 - x + OLED_WIDTH * y]));
+
+			image[2 * x + OLED_WIDTH * y] = h1 | l1;
+			image[2 * x + 1 + OLED_WIDTH * y] = h2 | l2;
+		}
+	}
+}
+
+static void
+oled_surface_to_image (guchar          *image,
+		       cairo_surface_t *surface)
+{
+	unsigned char *csurf;
+	int i, x, y;
+	unsigned char lo, hi;
+
+	cairo_surface_flush (surface);
+	csurf = cairo_image_surface_get_data (surface);
+	i = 0;
+	for (y = 0; y < OLED_HEIGHT; y++) {
+		for (x = 0; x < (OLED_WIDTH / 2); x++) {
+			hi = 0xf0 & csurf[4 * OLED_WIDTH * y + 8 * x + 1];
+			lo = 0x0f & (csurf[4 * OLED_WIDTH * y + 8 * x + 5] >> 4);
+			image[i] = hi | lo;
+			i++;
+		}
+	}
+}
+
+static void
+oled_split_text (char *label,
+		 char *line1,
+		 char *line2)
+{
+	char delimiters[5] = "+-_ ";
+	char **token;
+	int token_len[MAX_TOKEN];
+	gsize length;
+	int i;
+
+	if (g_utf8_strlen (label, LABEL_SIZE) <= MAX_1ST_LINE_LEN) {
+		g_utf8_strncpy (line1, label, MAX_1ST_LINE_LEN);
+		return;
+	}
+
+	token = g_strsplit_set (label, delimiters, -1);
+
+	if (g_utf8_strlen (token[0], LABEL_SIZE) > MAX_1ST_LINE_LEN) {
+		g_utf8_strncpy (line1, label, MAX_1ST_LINE_LEN);
+		g_utf8_strncpy (line2, label + MAX_1ST_LINE_LEN, LABEL_SIZE - MAX_1ST_LINE_LEN);
+		return;
+	}
+
+	for (i = 0; token[i] != NULL; i++)
+		token_len[i] = g_utf8_strlen (token[i], LABEL_SIZE);
+
+	length = token_len[0];
+	i = 0;
+	while ((length + token_len[i + 1] + 1) <= MAX_1ST_LINE_LEN) {
+		i++;
+		length = length + token_len[i] + 1;
+	}
+
+	g_utf8_strncpy (line1, label, length);
+	g_utf8_strncpy (line2, label + length + 1, LABEL_SIZE - length);
+
+	return;
+}
+
+static void
+oled_render_text (char   *label,
+		  guchar *image)
+{
+	cairo_t *cr;
+	cairo_surface_t *surface;
+	PangoFontDescription *desc;
+	PangoLayout *layout;
+	int width, height;
+	double dx, dy;
+	char line1[LABEL_SIZE + 1] = "";
+	char line2[LABEL_SIZE + 1] = "";
+	char *buf;
+
+	oled_split_text (label ,line1, line2);
+
+	buf = g_strdup_printf ("%s\n%s", line1, line2);