[gnome-boxes/use-better-drawing-for-thumbnails: 8/8] thumbnail: Use our custom logic to draw thumbnails

[Felipe Borges <felipeborges src gnome org>]

commit b5b4d8a8280690ce35d4dc11b7ad972ae0b30b5f
Author: Felipe Borges <felipeborges gnome org>
Date:   Tue Mar 29 16:21:27 2022 +0200

    thumbnail: Use our custom logic to draw thumbnails
    
    Our Machine.set_screenshot method already implements some nice
    heuristic to polish the display screenshot for thumbnails.

 src/machine.vala      |  2 +-
 src/ui/thumbnail.vala | 19 ++++++++++++-------
 2 files changed, 13 insertions(+), 8 deletions(-)
---
diff --git a/src/machine.vala b/src/machine.vala
index de495b88..c23cc24c 100644
--- a/src/machine.vala
+++ b/src/machine.vala
@@ -340,7 +340,7 @@ protected virtual async void save_real () throws GLib.Error {
     // just before going back to the collection view. Taking regular
     // screenshots can have its use in case of an abnormal gnome-boxes
     // termination.
-    protected async virtual Gdk.Pixbuf? take_screenshot () throws GLib.Error {
+    public async virtual Gdk.Pixbuf? take_screenshot () throws GLib.Error {
         if (display == null)
             return null;
 
diff --git a/src/ui/thumbnail.vala b/src/ui/thumbnail.vala
index 7105c690..8ed313f2 100644
--- a/src/ui/thumbnail.vala
+++ b/src/ui/thumbnail.vala
@@ -31,13 +31,18 @@ public void update (Machine machine) {
         }
 
         if (machine.pixbuf != null && !machine.is_stopped) {
-            live_thumbnail.set_from_pixbuf (
-                machine.pixbuf.scale_simple (width_request,
-                                             height_request,
-                                             Gdk.InterpType.BILINEAR));
-            stack.visible_child = live_thumbnail;
-
-            return;
+            machine.take_screenshot.begin ((source, result) => {
+                try {
+                    var screenshot = machine.take_screenshot.end (result);
+                    var scaled = screenshot.scale_simple (width_request,
+                                                          height_request,
+                                                          Gdk.InterpType.BILINEAR);
+                    live_thumbnail.set_from_pixbuf (scaled);
+                    stack.visible_child = live_thumbnail;
+                } catch (GLib.Error error) {
+                    debug (error.message);
+                }
+            });
         }
 
         stack.visible_child = blank_thumbnail;