inspector: Add a switch for fallback rendering

gtk/inspector/visual.c

@@ -36,6 +36,9 @@
 #include "gtkscale.h"
 #include "gtkwindow.h"
 #include "gtklistbox.h"
+#include "gskdebugprivate.h"
+#include "gskrendererprivate.h"
+#include "gtknative.h"
 
 #include "fallback-c89.c"
 
@@ -74,6 +77,7 @@ struct _GtkInspectorVisualPrivate
   GtkWidget *debug_box;
   GtkWidget *fps_switch;
   GtkWidget *updates_switch;
+  GtkWidget *fallback_switch;
   GtkWidget *baselines_switch;
   GtkWidget *layout_switch;
   GtkWidget *resize_switch;
@@ -302,6 +306,48 @@ updates_activate (GtkSwitch          *sw,
   redraw_everything ();
 }
 
+static void
+fallback_activate (GtkSwitch          *sw,
+                   GParamSpec         *pspec,
+                   GtkInspectorVisual *vis)
+{
+  GtkInspectorWindow *iw;
+  gboolean fallback;
+  guint flags;
+  GList *toplevels, *l;
+
+  fallback = gtk_switch_get_active (sw);
+  iw = GTK_INSPECTOR_WINDOW (gtk_widget_get_root (GTK_WIDGET (vis)));
+  if (iw == NULL)
+    return;
+
+  flags = gsk_get_debug_flags ();
+  if (fallback)
+    flags = flags | GSK_DEBUG_FALLBACK;
+  else
+    flags = flags & ~GSK_DEBUG_FALLBACK;
+  gsk_set_debug_flags (flags);
+
+  toplevels = gtk_window_list_toplevels ();
+  for (l = toplevels; l; l = l->next)
+    {
+      GtkWidget *toplevel = l->data;
+      GskRenderer *renderer;
+
+      if ((GtkRoot *)toplevel == gtk_widget_get_root (GTK_WIDGET (sw))) /* skip the inspector */
+        continue;
+
+      renderer = gtk_native_get_renderer (GTK_NATIVE (toplevel));
+      if (!renderer)
+        continue;
+
+      gsk_renderer_set_debug_flags (renderer, flags);
+    }
+  g_list_free (toplevels);
+
+  redraw_everything ();
+}
+
 static void
 baselines_activate (GtkSwitch *sw)
 {
@@ -871,6 +917,11 @@ row_activated (GtkListBox         *box,
       GtkSwitch *sw = GTK_SWITCH (vis->priv->updates_switch);
       gtk_switch_set_active (sw, !gtk_switch_get_active (sw));
     }
+  else if (gtk_widget_is_ancestor (vis->priv->fallback_switch, GTK_WIDGET (row)))
+    {
+      GtkSwitch *sw = GTK_SWITCH (vis->priv->fallback_switch);
+      gtk_switch_set_active (sw, !gtk_switch_get_active (sw));
+    }
   else if (gtk_widget_is_ancestor (vis->priv->baselines_switch, GTK_WIDGET (row)))
     {
       GtkSwitch *sw = GTK_SWITCH (vis->priv->baselines_switch);
@@ -1058,12 +1109,14 @@ gtk_inspector_visual_class_init (GtkInspectorVisualClass *klass)
   gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorVisual, font_scale_adjustment);
   gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorVisual, fps_switch);
   gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorVisual, updates_switch);
+  gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorVisual, fallback_switch);
   gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorVisual, baselines_switch);
   gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorVisual, layout_switch);
   gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorVisual, resize_switch);
 
   gtk_widget_class_bind_template_callback (widget_class, fps_activate);
   gtk_widget_class_bind_template_callback (widget_class, updates_activate);
+  gtk_widget_class_bind_template_callback (widget_class, fallback_activate);
   gtk_widget_class_bind_template_callback (widget_class, direction_changed);
   gtk_widget_class_bind_template_callback (widget_class, baselines_activate);
   gtk_widget_class_bind_template_callback (widget_class, layout_activate);

gtk/inspector/visual.ui

@@ -425,6 +425,32 @@
                         </child>
                       </object>
                     </child>
+                    <child>
+                      <object class="GtkListBoxRow">
+                        <child>
+                          <object class="GtkBox">
+                            <property name="margin">10</property>
+                            <property name="spacing">40</property>
+                            <child>
+                              <object class="GtkLabel" id="fallback_label">
+                                <property name="label" translatable="yes">Show Fallback Rendering</property>
+                                <property name="halign">start</property>
+                                <property name="valign">baseline</property>
+                                <property name="xalign">0.0</property>
+                              </object>
+                            </child>
+                            <child>
+                              <object class="GtkSwitch" id="fallback_switch">
+                                <property name="halign">end</property>
+                                <property name="valign">baseline</property>
+                                <property name="hexpand">1</property>
+                                <signal name="notify::active" handler="fallback_activate"/>
+                              </object>
+                            </child>
+                          </object>
+                        </child>
+                      </object>
+                    </child>
                     <child>
                       <object class="GtkListBoxRow">
                         <child>
@@ -586,6 +612,7 @@
       <widget name="hidpi_label"/>
       <widget name="animation_label"/>
       <widget name="updates_label"/>
+      <widget name="fallback_label"/>
       <widget name="baselines_label"/>
       <widget name="layout_label"/>
       <widget name="resize_label"/>