[libhandy] avatar: Center custom images

[Alexander Mikhaylenko <alexm src gnome org>]

commit 2dacd3e4c1a31c66ef3da3b09ad362cc91f7f439
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Sat Oct 3 04:33:12 2020 +0500

    avatar: Center custom images
    
    Right now it picks top left corner, which isn't really expected for
    avatars.

 src/hdy-avatar.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/src/hdy-avatar.c b/src/hdy-avatar.c
index d330d73f..71b015f0 100644
--- a/src/hdy-avatar.c
+++ b/src/hdy-avatar.c
@@ -100,13 +100,15 @@ round_image (GdkPixbuf *pixbuf,
 {
   g_autoptr (cairo_surface_t) surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, size, size);
   g_autoptr (cairo_t) cr = cairo_create (surface);
+  gint width = gdk_pixbuf_get_width (pixbuf);
+  gint height = gdk_pixbuf_get_height (pixbuf);
 
   /* Clip a circle */
   cairo_arc (cr, size / 2.0, size / 2.0, size / 2.0, 0, 2 * G_PI);
   cairo_clip (cr);
   cairo_new_path (cr);
 
-  gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
+  gdk_cairo_set_source_pixbuf (cr, pixbuf, (size - width) / 2, (size - height) / 2);
   cairo_paint (cr);
 
   return g_steal_pointer (&surface);