From b8b8b155c45e54e8c2bd4d7e161a28b55a5088e1 Mon Sep 17 00:00:00 2001
From: Emmanuele Bassi <ebassi@linux.intel.com>
Date: Tue, 23 Dec 2008 13:55:51 +0000
Subject: [PATCH] Add signals for Backend options

The ClutterBackend instance at the moment lacks the ability to
notify runtime changes of the font options and the resolution.

For this reason, this commit adds a ::resolution-changed and a
::font-changed signals to the Backend class.

The ::resolution-changed signal is emitted when set_resolution()
is called with a different DPI; ::font-changed is emitted when the
cairo_font_options_t* changes from the default.
---
 clutter/clutter-backend.c | 36 ++++++++++++++++++++++++++++++++++--
 clutter/clutter-backend.h |  4 ++++
 2 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/clutter/clutter-backend.c b/clutter/clutter-backend.c
index 9a599c16b..086f27494 100644
--- a/clutter/clutter-backend.c
+++ b/clutter/clutter-backend.c
@@ -44,6 +44,7 @@
 #include "clutter-backend.h"
 #include "clutter-debug.h"
 #include "clutter-fixed.h"
+#include "clutter-marshal.h"
 #include "clutter-private.h"
 
 G_DEFINE_ABSTRACT_TYPE (ClutterBackend, clutter_backend, G_TYPE_OBJECT);
@@ -62,6 +63,16 @@ struct _ClutterBackendPrivate
   cairo_font_options_t *font_options;
 };
 
+enum
+{
+  RESOLUTION_CHANGED,
+  FONT_CHANGED,
+
+  LAST_SIGNAL
+};
+
+static guint backend_signals[LAST_SIGNAL] = { 0, };
+
 static void
 clutter_backend_dispose (GObject *gobject)
 {
@@ -89,6 +100,24 @@ clutter_backend_class_init (ClutterBackendClass *klass)
   gobject_class->dispose = clutter_backend_dispose;
 
   g_type_class_add_private (gobject_class, sizeof (ClutterBackendPrivate));
+
+  backend_signals[RESOLUTION_CHANGED] =
+    g_signal_new (I_("resolution-changed"),
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  G_STRUCT_OFFSET (ClutterBackendClass, resolution_changed),
+                  NULL, NULL,
+                  clutter_marshal_VOID__VOID,
+                  G_TYPE_NONE, 0);
+
+  backend_signals[FONT_CHANGED] =
+    g_signal_new (I_("font-changed"),
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_LAST,
+                  G_STRUCT_OFFSET (ClutterBackendClass, font_changed),
+                  NULL, NULL,
+                  clutter_marshal_VOID__VOID,
+                  G_TYPE_NONE, 0);
 }
 
 static void
@@ -388,8 +417,9 @@ clutter_backend_set_resolution (ClutterBackend *backend,
     priv->resolution = fixed_dpi;
 
   if (CLUTTER_CONTEXT ()->font_map)
-    cogl_pango_font_map_set_resolution (CLUTTER_CONTEXT ()->font_map,
-					COGL_FIXED_TO_FLOAT (fixed_dpi));
+    cogl_pango_font_map_set_resolution (CLUTTER_CONTEXT ()->font_map, dpi);
+
+  g_signal_emit (backend, backend_signals[RESOLUTION_CHANGED], 0);
 }
 
 /**
@@ -445,6 +475,8 @@ clutter_backend_set_font_options (ClutterBackend       *backend,
         priv->font_options = cairo_font_options_copy (options);
       else
         priv->font_options = NULL;
+
+      g_signal_emit (backend, backend_signals[FONT_CHANGED], 0);
     }
 }
 
diff --git a/clutter/clutter-backend.h b/clutter/clutter-backend.h
index 27f49c46f..0669d4faa 100644
--- a/clutter/clutter-backend.h
+++ b/clutter/clutter-backend.h
@@ -77,6 +77,10 @@ struct _ClutterBackendClass
                                             ClutterStage    *stage);
   void                (* ensure_context)   (ClutterBackend  *backend,
                                             ClutterStage    *stage);
+
+  /* signals */
+  void (* resolution_changed) (ClutterBackend *backend);
+  void (* font_changed)       (ClutterBackend *backend);
 };
 
 GType clutter_backend_get_type    (void) G_GNUC_CONST;