[gnome-shell] loginDialog: Load logo file texture given resource scale

[Jonas Ådahl <jadahl src gnome org>]

commit 26e3ccda496cb62f0b4e3b6e1edbfbb0f738eac2
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Thu Nov 30 02:34:42 2017 +0100

    loginDialog: Load logo file texture given resource scale
    
    And reload the logo if the resource scale changes.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=765011

 js/gdm/loginDialog.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/js/gdm/loginDialog.js b/js/gdm/loginDialog.js
index bf7577c36..6c4d1357d 100644
--- a/js/gdm/loginDialog.js
+++ b/js/gdm/loginDialog.js
@@ -481,6 +481,9 @@ var LoginDialog = GObject.registerClass({
         this._logoBin = new St.Widget({ style_class: 'login-dialog-logo-bin',
                                         x_align: Clutter.ActorAlign.CENTER,
                                         y_align: Clutter.ActorAlign.END });
+        this._logoBin.connect('resource-scale-changed', () => {
+            this._updateLogoTexture(this._textureCache, this._logoFile);
+        });
         this.add_child(this._logoBin);
         this._updateLogo();
 
@@ -778,12 +781,12 @@ var LoginDialog = GObject.registerClass({
             return;
 
         this._logoBin.destroy_all_children();
-        if (this._logoFile) {
+        if (this._logoFile && this._logoBin.resource_scale > 0) {
             let scaleFactor = St.ThemeContext.get_for_stage(global.stage).scale_factor;
             this._logoBin.add_child(this._textureCache.load_file_async(this._logoFile,
                                                                        -1, _LOGO_ICON_HEIGHT,
                                                                        scaleFactor,
-                                                                       1));
+                                                                       this._logoBin.resource_scale));
         }
     }