Resolve some deprecation warnings

Also, when loading an image with "Limited quality", only take into account
the dimensions of the current monitor, as opposed to the dimensions of the
entire screen which may consist of multiple monitors.

src/image_viewer.c

@@ -75,8 +75,6 @@ struct _RsttoImageViewerPriv
 {
     RsttoFile                   *file;
     RsttoSettings               *settings;
-    GdkVisual                   *visual;
-    //GdkColormap                 *colormap;
 
     GtkIconTheme                *icon_theme;
     GdkPixbuf                   *missing_icon;
@@ -307,9 +305,6 @@ rstto_image_viewer_init (RsttoImageViewer *viewer)
     viewer->priv->settings = rstto_settings_new ();
     viewer->priv->image_width = 0;
     viewer->priv->image_height = 0;
-    viewer->priv->visual = gdk_visual_get_system ();
-    // TODO: comment out for now
-    //viewer->priv->colormap = gdk_colormap_new (viewer->priv->visual, TRUE);
 
     viewer->priv->icon_theme = gtk_icon_theme_get_default ();
     viewer->priv->bg_icon = gtk_icon_theme_load_icon (
@@ -510,11 +505,8 @@ rstto_image_viewer_realize(GtkWidget *widget)
     attributes.window_type = GDK_WINDOW_CHILD;
     attributes.event_mask = gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK;
     attributes.visual = gtk_widget_get_visual (widget);
-    // TODO: comment out for now
-    //attributes.colormap = gtk_widget_get_colormap (widget);
 
-    // TODO: comment out for now
-    attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL /*| GDK_WA_COLORMAP*/;
+    attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL;
     window = gdk_window_new (gtk_widget_get_parent_window(widget), &attributes, attributes_mask);
     gtk_widget_set_window (widget, window);
     gdk_window_set_user_data (window, widget);
@@ -2125,8 +2117,6 @@ cb_rstto_image_loader_image_ready (GdkPixbufLoader *loader, RsttoImageViewerTran
 static void
 cb_rstto_image_loader_size_prepared (GdkPixbufLoader *loader, gint width, gint height, RsttoImageViewerTransaction *transaction)
 {
-    gint s_width = gdk_screen_get_width (default_screen);
-    gint s_height = gdk_screen_get_height (default_screen);
     gboolean limit_quality = transaction->viewer->priv->limit_quality;
 
     /*
@@ -2141,6 +2131,16 @@ cb_rstto_image_loader_size_prepared (GdkPixbufLoader *loader, gint width, gint h
 
     if (limit_quality == TRUE)
     {
+        GdkMonitor *monitor = gdk_display_get_monitor_at_window (
+                gdk_screen_get_display (default_screen),
+                gtk_widget_get_window (GTK_WIDGET (transaction->viewer)));
+        gint s_width, s_height;
+        GdkRectangle monitor_geometry;
+
+        gdk_monitor_get_geometry (monitor, &monitor_geometry);
+        s_width = monitor_geometry.width;
+        s_height = monitor_geometry.height;
+
         /*
          * Set the maximum size of the loaded image to the screen-size.
          * TODO: Add some 'smart-stuff' here