[nautilus/wip/antoniof/hidpi-and-icons-cleanup: 31/32] icon-info: Add HiDPI support for custom icons too

[António Fernandes <antoniof src gnome org>]

commit 6f56e15cff3a71bc99bbab27cfb8e61ba3bc3888
Author: António Fernandes <antoniof gnome org>
Date:   Mon Aug 8 00:38:58 2022 +0100

    icon-info: Add HiDPI support for custom icons too
    
    The properties dialog provides the ability to set a custom icon.
    
    These are not icon paintables, but rather loadable icons, just
    like thumbnails are. Therefore, they need to be snapshot into
    the real area too, otherwise they are going to be too large.

 src/nautilus-icon-info.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)
---
diff --git a/src/nautilus-icon-info.c b/src/nautilus-icon-info.c
index b5754518c..c6b1e9a92 100644
--- a/src/nautilus-icon-info.c
+++ b/src/nautilus-icon-info.c
@@ -337,7 +337,7 @@ nautilus_icon_info_lookup (GIcon *icon,
     if (G_IS_LOADABLE_ICON (icon))
     {
         g_autoptr (GdkPixbuf) pixbuf = NULL;
-        g_autoptr (GdkTexture) texture = NULL;
+        g_autoptr (GdkPaintable) paintable = NULL;
         LoadableIconKey lookup_key;
         LoadableIconKey *key;
         GInputStream *stream;
@@ -376,10 +376,18 @@ nautilus_icon_info_lookup (GIcon *icon,
 
         if (pixbuf != NULL)
         {
-            texture = gdk_texture_new_for_pixbuf (pixbuf);
+            double width = gdk_pixbuf_get_width (pixbuf) / scale;
+            double height = gdk_pixbuf_get_height (pixbuf) / scale;
+            g_autoptr (GdkTexture) texture = gdk_texture_new_for_pixbuf (pixbuf);
+            g_autoptr (GtkSnapshot) snapshot = gtk_snapshot_new ();
+
+            gdk_paintable_snapshot (GDK_PAINTABLE (texture),
+                                    GDK_SNAPSHOT (snapshot),
+                                    width, height);
+            paintable = gtk_snapshot_to_paintable (snapshot, NULL);
         }
 
-        icon_info = nautilus_icon_info_new_for_paintable (GDK_PAINTABLE (texture), scale);
+        icon_info = nautilus_icon_info_new_for_paintable (paintable, scale);
 
         key = loadable_icon_key_new (icon, scale, size);
         g_hash_table_insert (loadable_icon_cache, key, icon_info);