gnome-desktop r5179 - in trunk/libgnome-desktop: . libgnomeui

[federico svn gnome org]

Author: federico
Date: Sat Aug 16 01:45:46 2008
New Revision: 5179
URL: http://svn.gnome.org/viewvc/gnome-desktop?rev=5179&view=rev

Log:
Create a palette to label the outputs

Signed-off-by: Federico Mena Quintero <federico novell com>


Modified:
   trunk/libgnome-desktop/gnome-rr-labeler.c
   trunk/libgnome-desktop/libgnomeui/gnome-rr-labeler.h

Modified: trunk/libgnome-desktop/gnome-rr-labeler.c
==============================================================================
--- trunk/libgnome-desktop/gnome-rr-labeler.c	(original)
+++ trunk/libgnome-desktop/gnome-rr-labeler.c	Sat Aug 16 01:45:46 2008
@@ -2,9 +2,9 @@
  * while they are being configured.
  *
  * Copyright 2008, Novell, Inc.
- * 
+ *
  * This file is part of the Gnome Library.
- * 
+ *
  * The Gnome Library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public License as
  * published by the Free Software Foundation; either version 2 of the
@@ -14,12 +14,12 @@
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
- * 
+ *
  * You should have received a copy of the GNU Library General Public
  * License along with the Gnome Library; see the file COPYING.LIB.  If not,
  * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  * Boston, MA 02111-1307, USA.
- * 
+ *
  * Author: Federico Mena-Quintero <federico novell com>
  */
 
@@ -32,6 +32,11 @@
 	GObject parent;
 
 	GnomeRRScreen *screen;
+	GnomeRRConfig *config;
+
+	int num_outputs;
+
+	GdkColor *palette;
 };
 
 struct _GnomeRRLabelerClass {
@@ -72,6 +77,139 @@
 	G_OBJECT_CLASS (gnome_rr_labeler_parent_class)->finalize (object);
 }
 
+static int
+count_outputs (GnomeRRConfig *config)
+{
+	int i;
+
+	for (i = 0; config->outputs[i] != NULL; i++)
+		;
+
+	return i;
+}
+
+/* hsv_to_rgb() stolen from gtk+/gtk/gtkhsv.c, sigh. */
+
+#define INTENSITY(r, g, b) ((r) * 0.30 + (g) * 0.59 + (b) * 0.11)
+
+/* Converts from HSV to RGB */
+static void
+hsv_to_rgb (gdouble *h,
+	    gdouble *s,
+	    gdouble *v)
+{
+  gdouble hue, saturation, value;
+  gdouble f, p, q, t;
+
+  if (*s == 0.0)
+    {
+      *h = *v;
+      *s = *v;
+      *v = *v; /* heh */
+    }
+  else
+    {
+      hue = *h * 6.0;
+      saturation = *s;
+      value = *v;
+
+      if (hue == 6.0)
+	hue = 0.0;
+
+      f = hue - (int) hue;
+      p = value * (1.0 - saturation);
+      q = value * (1.0 - saturation * f);
+      t = value * (1.0 - saturation * (1.0 - f));
+
+      switch ((int) hue)
+	{
+	case 0:
+	  *h = value;
+	  *s = t;
+	  *v = p;
+	  break;
+
+	case 1:
+	  *h = q;
+	  *s = value;
+	  *v = p;
+	  break;
+
+	case 2:
+	  *h = p;
+	  *s = value;
+	  *v = t;
+	  break;
+
+	case 3:
+	  *h = p;
+	  *s = q;
+	  *v = value;
+	  break;
+
+	case 4:
+	  *h = t;
+	  *s = p;
+	  *v = value;
+	  break;
+
+	case 5:
+	  *h = value;
+	  *s = p;
+	  *v = q;
+	  break;
+
+	default:
+	  g_assert_not_reached ();
+	}
+    }
+}
+
+static void
+make_palette (GnomeRRLabeler *labeler)
+{
+	/* The idea is that we go around an hue color wheel.  We want to start
+	 * at red, go around to green/etc. and stop at blue --- because magenta
+	 * is evil.  Eeeeek, no magenta, please!
+	 *
+	 * Purple would be nice, though.  Remember that we are watered down
+	 * (i.e. low saturation), so that would be like Like berries with cream.
+	 * Mmmmm, berries.
+	 */
+	double start_hue;
+	double end_hue;
+	int i;
+
+	g_assert (labeler->num_outputs > 0);
+
+	labeler->palette = g_new (GdkColor, labeler->num_outputs);
+
+	start_hue = 0.0; /* red */
+	end_hue   = 2.0/3; /* blue */
+
+	for (i = 0; i < labeler->num_outputs; i++) {
+		double h, s, v;
+
+		h = start_hue + (end_hue - start_hue) / labeler->num_outputs * i;
+		s = 1.0 / 3;
+		v = 1.0;
+
+		hsv_to_rgb (&h, &s, &v);
+
+		labeler->palette[i].red   = (int) (65535 * h + 0.5);
+		labeler->palette[i].green = (int) (65535 * s + 0.5);
+		labeler->palette[i].blue  = (int) (65535 * v + 0.5);
+	}
+}
+
+static void
+setup_from_rr_screen (GnomeRRLabeler *labeler)
+{
+	labeler->config = gnome_rr_config_new_current (labeler->screen);
+	labeler->num_outputs = count_outputs (labeler->config);
+	make_palette (labeler);
+}
+
 GnomeRRLabeler *
 gnome_rr_labeler_new (GnomeRRScreen *screen)
 {
@@ -82,6 +220,8 @@
 	labeler = g_object_new (GNOME_TYPE_RR_LABELER, NULL);
 	labeler->screen = screen;
 
+	setup_from_rr_screen (labeler);
+
 	return labeler;
 }
 
@@ -92,3 +232,25 @@
 
 	/* FIXME */
 }
+
+void
+gnome_rr_labeler_get_color_for_output (GnomeRRLabeler *labeler, GnomeOutputInfo *output, GdkColor *color_out)
+{
+	int i;
+
+	g_return_if_fail (GNOME_IS_RR_LABELER (labeler));
+	g_return_if_fail (output != NULL);
+	g_return_if_fail (color_out != NULL);
+
+	for (i = 0; i < labeler->num_outputs; i++)
+		if (labeler->config->outputs[i] == output) {
+			*color_out = labeler->palette[i];
+			return;
+		}
+
+	g_warning ("trying to get the color for unknown GnomeOutputInfo %p; returning magenta!", output);
+
+	color_out->red   = 0xffff;
+	color_out->green = 0;
+	color_out->blue  = 0xffff;
+}

Modified: trunk/libgnome-desktop/libgnomeui/gnome-rr-labeler.h
==============================================================================
--- trunk/libgnome-desktop/libgnomeui/gnome-rr-labeler.h	(original)
+++ trunk/libgnome-desktop/libgnomeui/gnome-rr-labeler.h	Sat Aug 16 01:45:46 2008
@@ -2,9 +2,9 @@
  * while they are being configured.
  *
  * Copyright 2008, Novell, Inc.
- * 
+ *
  * This file is part of the Gnome Library.
- * 
+ *
  * The Gnome Library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public License as
  * published by the Free Software Foundation; either version 2 of the
@@ -14,12 +14,12 @@
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
- * 
+ *
  * You should have received a copy of the GNU Library General Public
  * License along with the Gnome Library; see the file COPYING.LIB.  If not,
  * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  * Boston, MA 02111-1307, USA.
- * 
+ *
  * Author: Federico Mena-Quintero <federico novell com>
  */
 
@@ -48,4 +48,6 @@
 
 void gnome_rr_labeler_hide (GnomeRRLabeler *labeler);
 
+void gnome_rr_labeler_get_color_for_output (GnomeRRLabeler *labeler, GnomeOutputInfo *output, GdkColor *color_out);
+
 #endif