[gtk+/wip/baedert/drawing] widget: Bring resize and baseline debug rendering back

[Timm Bäder <baedert src gnome org>]

commit 7a091c7e069b60ca654bb1a05372e29e4fa7ba53
Author: Timm Bäder <mail baedert org>
Date:   Sat May 20 19:32:16 2017 +0200

    widget: Bring resize and baseline debug rendering back

 gtk/gtkwidget.c |   45 +++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 45 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 4ee2b58..d446a6d 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -15576,6 +15576,46 @@ gtk_widget_reset_controllers (GtkWidget *widget)
     }
 }
 
+static inline void
+gtk_widget_maybe_add_debug_render_nodes (GtkWidget             *widget,
+                                         GtkSnapshot           *snapshot,
+                                         const graphene_rect_t *bounds)
+{
+  GtkWidgetPrivate *priv = gtk_widget_get_instance_private (widget);
+  GdkDisplay *display = gtk_widget_get_display (widget);
+
+  if (GTK_DISPLAY_DEBUG_CHECK (display, BASELINES))
+    {
+      int baseline = gtk_widget_get_allocated_baseline (widget);
+
+      if (baseline != -1)
+        {
+          cairo_t *ct = gtk_snapshot_append_cairo (snapshot, bounds, "Baseline Debug");
+          cairo_new_path (ct);
+          cairo_move_to (ct, 0, baseline+0.5);
+          cairo_line_to (ct, bounds->size.width, baseline+0.5);
+          cairo_set_line_width (ct, 1.0);
+          cairo_set_source_rgba (ct, 1.0, 0, 0, 0.25);
+          cairo_stroke (ct);
+
+          cairo_destroy (ct);
+        }
+    }
+
+  if (GTK_DISPLAY_DEBUG_CHECK (display, RESIZE) &&
+      priv->highlight_resize)
+    {
+      cairo_t *ct = gtk_snapshot_append_cairo (snapshot, bounds, "Resize Debug");
+      cairo_rectangle (ct, 0, 0, bounds->size.width, bounds->size.height);
+      cairo_set_source_rgba (ct, 1, 0, 0, 0.2);
+      cairo_fill (ct);
+      cairo_destroy (ct);
+
+      priv->highlight_resize = FALSE;
+      gtk_widget_queue_draw (widget);
+    }
+}
+
 void
 gtk_widget_snapshot (GtkWidget   *widget,
                      GtkSnapshot *snapshot)
@@ -15702,6 +15742,11 @@ gtk_widget_snapshot (GtkWidget   *widget,
 
   gtk_css_filter_value_pop_snapshot (filter_value, snapshot);
 
+#ifdef G_ENABLE_DEBUG
+  gtk_widget_maybe_add_debug_render_nodes (widget, snapshot, &bounds);
+#endif
+
+
   if (GTK_DEBUG_CHECK (SNAPSHOT))
     gtk_snapshot_pop (snapshot);
 }