image: Optimize non-resize changes

When the image content is changed, only queue a resize
if the size is actually changing, otherwise just a
redraw. Suggested by Owen in

https://bugzilla.gnome.org/show_bug.cgi?id=613833

gtk/gtkimage.c

@@ -155,6 +155,9 @@ static void gtk_image_size_allocate        (GtkWidget    *widget,
 static void gtk_image_unmap                (GtkWidget    *widget);
 static void gtk_image_realize              (GtkWidget    *widget);
 static void gtk_image_unrealize            (GtkWidget    *widget);
+static void gtk_image_get_preferred_size   (GtkImage     *image,
+                                            gint         *width_out,
+                                            gint         *height_out);
 static void gtk_image_get_preferred_width  (GtkWidget    *widget,
                                             gint         *minimum,
                                             gint         *natural);
@@ -934,8 +937,8 @@ gtk_image_set_from_file   (GtkImage    *image,
   priv = image->priv;
 
   g_object_freeze_notify (G_OBJECT (image));
-  
+
-  gtk_image_clear (image);
+  gtk_image_reset (image);
 
   if (filename == NULL)
     {
@@ -948,9 +951,7 @@ gtk_image_set_from_file   (GtkImage    *image,
 
   if (anim == NULL)
     {
-      gtk_image_set_from_icon_name (image,
+      gtk_image_set_from_icon_name (image, "image-missing", DEFAULT_ICON_SIZE);
-                                    "image-missing",
-                                    DEFAULT_ICON_SIZE);
       g_object_thaw_notify (G_OBJECT (image));
       return;
     }
@@ -971,7 +972,21 @@ gtk_image_set_from_file   (GtkImage    *image,
   g_object_unref (anim);
 
   priv->filename = g_strdup (filename);
-  
+
+  if (gtk_widget_get_visible (GTK_WIDGET (image)))
+    {
+      gint width, height;
+
+      gtk_image_get_preferred_size (image, &width, &height);
+      if (width != gtk_widget_get_allocated_width (GTK_WIDGET (image)) ||
+          height != gtk_widget_get_allocated_height (GTK_WIDGET (image)))
+        gtk_widget_queue_resize (GTK_WIDGET (image));
+      else
+        gtk_widget_queue_draw (GTK_WIDGET (image));
+    }
+
+  g_object_notify (G_OBJECT (image), "file");
+
   g_object_thaw_notify (G_OBJECT (image));
 }
 
@@ -1008,9 +1023,7 @@ gtk_image_set_from_resource (GtkImage    *image,
 
   if (animation == NULL)
     {
-      gtk_image_set_from_icon_name (image,
+      gtk_image_set_from_icon_name (image, "image-missing", DEFAULT_ICON_SIZE);
-                                    "image-missing",
-                                    DEFAULT_ICON_SIZE);
       g_object_thaw_notify (G_OBJECT (image));
       return;
     }
@@ -1046,18 +1059,29 @@ gtk_image_set_from_pixbuf (GtkImage  *image,
   GtkImagePrivate *priv;
 
   g_return_if_fail (GTK_IS_IMAGE (image));
-  g_return_if_fail (pixbuf == NULL ||
+  g_return_if_fail (pixbuf == NULL || GDK_IS_PIXBUF (pixbuf));
-                    GDK_IS_PIXBUF (pixbuf));
 
   priv = image->priv;
 
   g_object_freeze_notify (G_OBJECT (image));
-  
+
-  gtk_image_clear (image);
+  gtk_image_reset (image);
 
   if (pixbuf != NULL)
     _gtk_icon_helper_set_pixbuf (priv->icon_helper, pixbuf);
 
+  if (gtk_widget_get_visible (GTK_WIDGET (image)))
+    {
+      gint width, height;
+
+      gtk_image_get_preferred_size (image, &width, &height);
+      if (width != gtk_widget_get_allocated_width (GTK_WIDGET (image)) ||
+          height != gtk_widget_get_allocated_height (GTK_WIDGET (image)))
+        gtk_widget_queue_resize (GTK_WIDGET (image));
+      else
+        gtk_widget_queue_draw (GTK_WIDGET (image));
+    }
+
   g_object_notify (G_OBJECT (image), "pixbuf");
   
   g_object_thaw_notify (G_OBJECT (image));
@@ -1171,7 +1195,7 @@ gtk_image_set_from_animation (GtkImage           *image,
   if (animation)
     g_object_ref (animation);
 
-  gtk_image_clear (image);
+  gtk_image_reset (image);
 
   if (animation != NULL)
     {
@@ -1179,6 +1203,18 @@ gtk_image_set_from_animation (GtkImage           *image,
       g_object_unref (animation);
     }
 
+  if (gtk_widget_get_visible (GTK_WIDGET (image)))
+    {
+      gint width, height;
+
+      gtk_image_get_preferred_size (image, &width, &height);
+      if (width != gtk_widget_get_allocated_width (GTK_WIDGET (image)) ||
+          height != gtk_widget_get_allocated_height (GTK_WIDGET (image)))
+        gtk_widget_queue_resize (GTK_WIDGET (image));
+      else
+        gtk_widget_queue_draw (GTK_WIDGET (image));
+    }
+
   g_object_notify (G_OBJECT (image), "pixbuf-animation");
   
   g_object_thaw_notify (G_OBJECT (image));
@@ -1209,7 +1245,8 @@ gtk_image_set_from_icon_name  (GtkImage       *image,
   g_object_freeze_notify (G_OBJECT (image));
 
   new_name = g_strdup (icon_name);
-  gtk_image_clear (image);
+
+  gtk_image_reset (image);
 
   if (new_name)
     {
@@ -1217,6 +1254,18 @@ gtk_image_set_from_icon_name  (GtkImage       *image,
       g_free (new_name);
     }
 
+  if (gtk_widget_get_visible (GTK_WIDGET (image)))
+    {
+      gint width, height;
+
+      gtk_image_get_preferred_size (image, &width, &height);
+      if (width != gtk_widget_get_allocated_width (GTK_WIDGET (image)) ||
+          height != gtk_widget_get_allocated_height (GTK_WIDGET (image)))
+        gtk_widget_queue_resize (GTK_WIDGET (image));
+      else
+        gtk_widget_queue_draw (GTK_WIDGET (image));
+    }
+
   g_object_notify (G_OBJECT (image), "icon-name");
   g_object_notify (G_OBJECT (image), "icon-size");
   
@@ -1249,7 +1298,7 @@ gtk_image_set_from_gicon  (GtkImage       *image,
   if (icon)
     g_object_ref (icon);
 
-  gtk_image_clear (image);
+  gtk_image_reset (image);
 
   if (icon)
     {
@@ -1257,6 +1306,18 @@ gtk_image_set_from_gicon  (GtkImage       *image,
       g_object_unref (icon);
     }
 
+  if (gtk_widget_get_visible (GTK_WIDGET (image)))
+    {
+      gint width, height;
+
+      gtk_image_get_preferred_size (image, &width, &height);
+      if (width != gtk_widget_get_allocated_width (GTK_WIDGET (image)) ||
+          height != gtk_widget_get_allocated_height (GTK_WIDGET (image)))
+        gtk_widget_queue_resize (GTK_WIDGET (image));
+      else
+        gtk_widget_queue_draw (GTK_WIDGET (image));
+    }
+
   g_object_notify (G_OBJECT (image), "gicon");
   g_object_notify (G_OBJECT (image), "icon-size");
   
@@ -1287,7 +1348,7 @@ gtk_image_set_from_surface (GtkImage       *image,
   if (surface)
     cairo_surface_reference (surface);
 
-  gtk_image_clear (image);
+  gtk_image_reset (image);
 
   if (surface)
     {
@@ -1295,6 +1356,18 @@ gtk_image_set_from_surface (GtkImage       *image,
       cairo_surface_destroy (surface);
     }
 
+  if (gtk_widget_get_visible (GTK_WIDGET (image)))
+    {
+      gint width, height;
+
+      gtk_image_get_preferred_size (image, &width, &height);
+      if (width != gtk_widget_get_allocated_width (GTK_WIDGET (image)) ||
+          height != gtk_widget_get_allocated_height (GTK_WIDGET (image)))
+        gtk_widget_queue_resize (GTK_WIDGET (image));
+      else
+        gtk_widget_queue_draw (GTK_WIDGET (image));
+    }
+
   g_object_notify (G_OBJECT (image), "surface");
   
   g_object_thaw_notify (G_OBJECT (image));