[gtk/wip/baedert/for-master: 19/23] layoutoverlay: Avoid adding transparent color nodes

[Timm Bäder <baedert src gnome org>]

commit c34f98931e551b64141240820cd1eff218505b13
Author: Timm Bäder <mail baedert org>
Date:   Mon Dec 21 08:34:25 2020 +0100

    layoutoverlay: Avoid adding transparent color nodes
    
    We have a region for the border here, but the color is defined as
    transparent black because we don't want to render anything for it.
    
    This way, the generated .node file for the listbox demo in gtk4-demo
    with enabled layout borders is 3.5MB instead of 3.8MB.

 gtk/inspector/layoutoverlay.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/gtk/inspector/layoutoverlay.c b/gtk/inspector/layoutoverlay.c
index 3924f03bb8..a72a40940e 100644
--- a/gtk/inspector/layoutoverlay.c
+++ b/gtk/inspector/layoutoverlay.c
@@ -107,6 +107,9 @@ recurse_child_widgets (GtkWidget   *widget,
       const GdkRGBA *color = &colors[i];
       const GtkBorder *box = &boxes[i];
 
+      if (gdk_rgba_is_clear (color))
+        goto next;
+
       if (box->top > 0)
         gtk_snapshot_append_color (snapshot, color,
                                    &GRAPHENE_RECT_INIT ( 0, - box->top, width, box->top));
@@ -120,6 +123,7 @@ recurse_child_widgets (GtkWidget   *widget,
         gtk_snapshot_append_color (snapshot, color,
                                    &GRAPHENE_RECT_INIT (- box->left, 0, box->left, height));
 
+next:
       /* Grow box + offset */
       width += box->left + box->right;
       height += box->top + box->bottom;