[gnome-settings-daemon] common: Add (non-working) orientation calculation

[Bastien Nocera <hadess src gnome org>]

commit bd2ce171ec16db79bebfd742bcd278ebccdf05f0
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Jun 1 18:37:17 2011 +0100

    common: Add (non-working) orientation calculation
    
    The code currently seems to get the orientations the wrong
    way around.

 plugins/orientation/Makefile.am                    |   59 ++++++++++++++
 plugins/orientation/gsd-orientation-calc.c         |   80 ++++++++++++++++++++
 plugins/orientation/gsd-orientation-calc.h         |   44 +++++++++++
 plugins/orientation/test-orientation-calculation.c |   67 ++++++++++++++++
 4 files changed, 250 insertions(+), 0 deletions(-)
---
diff --git a/plugins/orientation/Makefile.am b/plugins/orientation/Makefile.am
new file mode 100644
index 0000000..b79ecc0
--- /dev/null
+++ b/plugins/orientation/Makefile.am
@@ -0,0 +1,59 @@
+plugin_name = orientation
+
+noinst_PROGRAMS = test-orientation-calculation
+
+test_orientation_calculation_SOURCES =	\
+	gsd-orientation-calc.c		\
+	gsd-orientation-calc.h		\
+	test-orientation-calculation.c
+
+test_orientation_calculation_CFLAGS =	\
+	$(PLUGIN_CFLAGS)		\
+	$(SETTINGS_PLUGIN_CFLAGS)	\
+	$(AM_CFLAGS)
+
+test_orientation_calculation_LDADD =	\
+	$(SETTINGS_PLUGIN_LIBS)
+
+plugin_LTLIBRARIES = liborientation.la
+
+liborientation_la_SOURCES = 		\
+	gsd-orientation-plugin.h	\
+	gsd-orientation-plugin.c	\
+	gsd-orientation-manager.h	\
+	gsd-orientation-manager.c	\
+	gsd-orientation-calc.c		\
+	gsd-orientation-calc.h
+
+liborientation_la_CPPFLAGS = \
+	-I$(top_srcdir)/gnome-settings-daemon		\
+	-I$(top_srcdir)/plugins/common/			\
+	-I$(top_srcdir)/data/				\
+	-DGNOME_SETTINGS_LOCALEDIR=\""$(datadir)/locale"\" \
+	-DLIBEXECDIR=\""$(libexecdir)"\" 		\
+	$(AM_CPPFLAGS)
+
+liborientation_la_CFLAGS = \
+	$(PLUGIN_CFLAGS)		\
+	$(GUDEV_CFLAGS)			\
+	$(SETTINGS_PLUGIN_CFLAGS)	\
+	$(AM_CFLAGS)
+
+liborientation_la_LDFLAGS = 		\
+	$(GSD_PLUGIN_LDFLAGS)
+
+liborientation_la_LIBADD  = 							\
+	$(top_builddir)/plugins/common/libcommon.la			\
+	$(SETTINGS_PLUGIN_LIBS)						\
+	$(X11_LIBS)							\
+	$(XINPUT_LIBS)
+
+plugin_in_files = orientation.gnome-settings-plugin.in
+
+plugin_DATA = $(plugin_in_files:.gnome-settings-plugin.in=.gnome-settings-plugin)
+
+EXTRA_DIST = $(plugin_in_files)
+CLEANFILES = $(plugin_DATA)
+DISTCLEANFILES = $(plugin_DATA)
+
+ GSD_INTLTOOL_PLUGIN_RULE@
diff --git a/plugins/orientation/gsd-orientation-calc.c b/plugins/orientation/gsd-orientation-calc.c
new file mode 100644
index 0000000..8bdec79
--- /dev/null
+++ b/plugins/orientation/gsd-orientation-calc.c
@@ -0,0 +1,80 @@
+/**
+   @file orientationinterpreter.cpp
+   @brief OrientationInterpreter
+
+   <p>
+   Copyright (C) 2009-2010 Nokia Corporation
+   Copyright (C) 2011 Red Hat, Inc.
+
+   @author �stün Ergenoglu <ext-ustun ergenoglu nokia com>
+   @author Timo Rongas <ext-timo 2 rongas nokia com>
+   @author Lihan Guo <lihan guo digia com>
+   @author Bastien Nocera <hadess hadess net> (C port)
+
+   This file is part of Sensord.
+
+   Sensord is free software; you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License
+   version 2.1 as published by the Free Software Foundation.
+
+   Sensord 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with Sensord.  If not, see <http://www.gnu.org/licenses/>.
+   </p>
+ */
+#include "config.h"
+
+#include <math.h>
+#include <stdlib.h>
+
+#include "gsd-orientation-calc.h"
+
+#define DEFAULT_THRESHOLD 250
+#define RADIANS_TO_DEGREES 180.0/M_PI
+#define SAME_AXIS_LIMIT 5
+
+#define THRESHOLD_LANDSCAPE  25
+#define THRESHOLD_PORTRAIT  20
+
+OrientationUp gsd_orientation_calc (OrientationUp prev,
+				    int x, int y, int z)
+{
+    int rotation;
+    OrientationUp ret = ORIENTATION_UNDEFINED;
+
+    /* Portrait check */
+    rotation = round (atan ((double) x / sqrt (y * y + z * z)) * RADIANS_TO_DEGREES);
+
+    if (abs (rotation) > THRESHOLD_PORTRAIT) {
+        ret = (rotation >= 0) ? ORIENTATION_LEFT_UP : ORIENTATION_RIGHT_UP;
+
+        /* Some threshold to switching between portrait modes */
+        if (prev == ORIENTATION_LEFT_UP || prev == ORIENTATION_RIGHT_UP) {
+            if (abs (rotation) < SAME_AXIS_LIMIT) {
+                ret = prev;
+            }
+        }
+
+    } else {
+        /* Landscape check */
+        rotation = round (atan ((double) y / sqrt (x * x + z * z)) * RADIANS_TO_DEGREES);
+
+        if (abs (rotation) > THRESHOLD_LANDSCAPE) {
+            ret = (rotation >= 0) ? ORIENTATION_BOTTOM_UP : ORIENTATION_NORMAL;
+
+            /* Some threshold to switching between landscape modes */
+            if (prev == ORIENTATION_BOTTOM_UP || prev == ORIENTATION_NORMAL) {
+                if (abs (rotation) < SAME_AXIS_LIMIT) {
+                    ret = prev;
+                }
+            }
+        }
+    }
+
+    return ret;
+}
+
diff --git a/plugins/orientation/gsd-orientation-calc.h b/plugins/orientation/gsd-orientation-calc.h
new file mode 100644
index 0000000..ef7446e
--- /dev/null
+++ b/plugins/orientation/gsd-orientation-calc.h
@@ -0,0 +1,44 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2007 William Jon McCann <mccann jhu edu>
+ * Copyright (C) 2010 Red Hat, Inc.
+ *
+ * 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.
+ *
+ */
+
+#ifndef __GSD_ORIENTATION_CALC_H
+#define __GSD_ORIENTATION_CALC_H
+
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+typedef enum {
+	ORIENTATION_UNDEFINED,
+	ORIENTATION_NORMAL,
+	ORIENTATION_BOTTOM_UP,
+	ORIENTATION_LEFT_UP,
+	ORIENTATION_RIGHT_UP
+} OrientationUp;
+
+#define ORIENTATION_UP_UP ORIENTATION_NORMAL
+
+OrientationUp gsd_orientation_calc (OrientationUp prev,
+				    int x, int y, int z);
+
+G_END_DECLS
+
+#endif /* __GSD_ORIENTATION_CALC_H */
diff --git a/plugins/orientation/test-orientation-calculation.c b/plugins/orientation/test-orientation-calculation.c
new file mode 100644
index 0000000..0c46d64
--- /dev/null
+++ b/plugins/orientation/test-orientation-calculation.c
@@ -0,0 +1,67 @@
+/* Adapted from
+ * http://gitorious.org/sensorfw/sensorfw/blobs/master/tests/contextfw/orientation/testorientation.py
+ */
+
+#include "config.h"
+
+#include <glib-object.h>
+
+#include "gsd-orientation-calc.h"
+
+struct {
+	int x;
+	int y;
+	int z;
+	OrientationUp o;
+} tests[] = {
+	{ 60, 960, 18, ORIENTATION_NORMAL },
+	{ 936, 162, 180, ORIENTATION_RIGHT_UP },
+	{ 72, -990, -162, ORIENTATION_BOTTOM_UP },
+	{ -954, -90, -36, ORIENTATION_LEFT_UP }
+};
+
+static const char *
+orientation_to_string (OrientationUp o)
+{
+	switch (o) {
+	case ORIENTATION_UNDEFINED:
+		return "undefined";
+	case ORIENTATION_NORMAL:
+		return "normal";
+	case ORIENTATION_BOTTOM_UP:
+		return "bottom up";
+	case ORIENTATION_LEFT_UP:
+		return "left up";
+	case ORIENTATION_RIGHT_UP:
+		return "right up";
+	default:
+		g_assert_not_reached ();
+	}
+}
+
+static void
+test_no_prev (void)
+{
+	guint i;
+
+	for (i = 0 ; i < G_N_ELEMENTS (tests); i++) {
+		OrientationUp calculated;
+		const char *got, *expected;
+
+		calculated = gsd_orientation_calc (ORIENTATION_UNDEFINED, tests[i].x, tests[i].y, tests[i].z);
+		got = orientation_to_string (calculated);
+		expected = orientation_to_string (tests[i].o);
+
+		g_assert_cmpstr (got, ==, expected);
+	}
+}
+
+int main (int argc, char **argv)
+{
+	g_type_init ();
+	g_test_init (&argc, &argv, NULL);
+	g_test_bug_base ("http://bugzilla.gnome.org/show_bug.cgi?id=";);
+
+	g_test_add_func ("/orientation/no-prev", test_no_prev);
+	return g_test_run ();
+}