Respect solid color wallpaper

data/greeter.metainfo.xml.in

@@ -45,6 +45,7 @@
         </ul>
       </description>
       <issues>
+        <issue url="https://github.com/elementary/greeter/issues/3">Login screen does not respect solid color background</issue>
         <issue url="https://github.com/elementary/greeter/issues/25">Mask corners</issue>
         <issue url="https://github.com/elementary/greeter/issues/70">User mouse settings aren't applied</issue>
         <issue url="https://github.com/elementary/greeter/issues/295">Clicking in the card but outside of the wallpaper window does not switch the card</issue>

src/Cards/UserCard.vala

@@ -29,6 +29,8 @@ public class Greeter.UserCard : Greeter.BaseCard {
     private Gtk.Revealer form_revealer;
     private Gtk.Stack login_stack;
     private Greeter.PasswordEntry password_entry;
+    private Gtk.Box main_box;
+
     private SelectionCheck logged_in;
 
     private unowned Gtk.StyleContext logged_in_context;
@@ -153,36 +155,12 @@ public class Greeter.UserCard : Greeter.BaseCard {
             SYNC_CREATE
         );
 
-        var background_path = lightdm_user.background;
-
-        if (background_path == null) {
-            string path = Path.build_filename ("/", "var", "lib", "lightdm-data", lightdm_user.name, "wallpaper");
-            if (FileUtils.test (path, EXISTS)) {
-                var background_directory = File.new_for_path (path);
-                try {
-                    var enumerator = background_directory.enumerate_children (FileAttribute.STANDARD_NAME, NONE);
-
-                    FileInfo file_info;
-                    while ((file_info = enumerator.next_file ()) != null) {
-                        if (file_info.get_file_type () == REGULAR) {
-                            background_path = Path.build_filename (path, file_info.get_name ());
-                            break;
-                        }
-                    }
-                } catch (Error e) {
-                    critical (e.message);
-                }
-            }
-        }
-
-        var background_image = new Greeter.BackgroundImage (background_path);
-
-        var main_box = new Gtk.Box (VERTICAL, 0) {
+        main_box = new Gtk.Box (Gtk.Orientation.VERTICAL, 0) {
             margin_bottom = 48
         };
-        main_box.add (background_image);
-        main_box.add (username_label);
-        main_box.add (form_revealer);
+        // in reverse order because pack_end is used
+        main_box.pack_end (form_revealer);
+        main_box.pack_end (username_label);
 
         main_box_style_context = main_box.get_style_context ();
         main_box_style_context.add_class (Granite.STYLE_CLASS_CARD);
@@ -288,17 +266,39 @@ public class Greeter.UserCard : Greeter.BaseCard {
         });
     }
 
-    private void update_style () {
-        var interface_settings = new GLib.Settings ("org.gnome.desktop.interface");
-        interface_settings.set_value ("gtk-theme", "io.elementary.stylesheet." + accent_to_string (prefers_accent_color));
-    }
-
     private void set_check_style () {
         // Override check's accent_color so that it *always* uses user's preferred color
         var style_provider = Gtk.CssProvider.get_named ("io.elementary.stylesheet." + accent_to_string (prefers_accent_color), null);
         logged_in_context.add_provider (style_provider, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION);
     }
 
+    private void set_background_image () {
+        Greeter.BackgroundImage background_image;
+
+        var background_path = lightdm_user.background;
+        var background_exists = (
+            background_path != null &&
+            FileUtils.test (background_path, EXISTS) &&
+            FileUtils.test (background_path, IS_REGULAR)
+        );
+
+        if (!background_exists) {
+            background_path = Path.build_filename ("/", "var", "lib", "lightdm-data", lightdm_user.name, "wallpaper");
+            background_exists = FileUtils.test (background_path, EXISTS) && FileUtils.test (background_path, IS_REGULAR);
+        }
+
+        if (settings_act.picture_options != 0 && background_exists) {
+            background_image = new Greeter.BackgroundImage.from_path (background_path);
+        } else if (settings_act.picture_options == 0 && settings_act.primary_color != null) {
+            background_image = new Greeter.BackgroundImage.from_color (settings_act.primary_color);
+        } else {
+            background_image = new Greeter.BackgroundImage.from_path (null);
+        }
+
+        main_box.pack_start (background_image);
+        main_box.show_all ();
+    }
+
     private string accent_to_string (int i) {
         switch (i) {
             case 1:
@@ -369,6 +369,7 @@ public class Greeter.UserCard : Greeter.BaseCard {
             }
         }
 
+        set_background_image ();
         set_check_style ();
 
         if (needs_settings_set) {
@@ -491,6 +492,11 @@ public class Greeter.UserCard : Greeter.BaseCard {
         night_light_settings.set_value ("night-light-temperature", settings_act.night_light_temperature);
     }
 
+    private void update_style () {
+        var interface_settings = new GLib.Settings ("org.gnome.desktop.interface");
+        interface_settings.set_value ("gtk-theme", "io.elementary.stylesheet." + accent_to_string (prefers_accent_color));
+    }
+
     public override void wrong_credentials () {
         unowned var entry_style_context = password_entry.get_style_context ();
         entry_style_context.add_class (Gtk.STYLE_CLASS_ERROR);

src/PantheonAccountsServicePlugin.vala

@@ -52,6 +52,8 @@ interface Pantheon.SettingsDaemon.AccountsService : Object {
     public abstract int cursor_size { get; set; }
     public abstract bool locate_pointer { get; set; }
     public abstract double text_scaling_factor { get; set; }
+    public abstract int picture_options { get; set; }
+    public abstract string primary_color { owned get; set; }
     public abstract string document_font_name { owned get; set; }
     public abstract string font_name { owned get; set; }
     public abstract string monospace_font_name { owned get; set; }

src/Widgets/BackgroundImage.vala

@@ -7,7 +7,7 @@ public class Greeter.BackgroundImage : Gtk.EventBox {
         height_request = 150;
     }
 
-    public BackgroundImage (string? path) {
+    public BackgroundImage.from_path (string? path) {
         if (path == null) {
             path = "/usr/share/backgrounds/elementaryos-default";
         }
@@ -26,6 +26,24 @@ public class Greeter.BackgroundImage : Gtk.EventBox {
         }
     }
 
+    public BackgroundImage.from_color (string color) {
+        full_pixbuf = new Gdk.Pixbuf (Gdk.Colorspace.RGB, false, 8, 1, 1);
+
+        Gdk.RGBA rgba_color = {};
+        rgba_color.parse (color);
+
+        uint32 f = 0x0;
+        f += (uint) Math.round (rgba_color.red * 255);
+        f <<= 8;
+        f += (uint) Math.round (rgba_color.green * 255);
+        f <<= 8;
+        f += (uint) Math.round (rgba_color.blue * 255);
+        f <<= 8;
+        f += 255;
+
+        full_pixbuf.fill (f);
+    }
+
     public override bool draw (Cairo.Context cr) {
         var scale = get_scale_factor ();
         var width = get_allocated_width () * scale;

src/meson.build

@@ -5,6 +5,7 @@ gtk_dep = dependency('gtk+-3.0')
 granite_dep = dependency('granite', version: '>= 5.5.0')
 hdy_dep = dependency('libhandy-1', version: '>= 1.1.90')
 lightdm_dep = dependency('liblightdm-gobject-1')
+m_dep = meson.get_compiler('c').find_library('m')
 
 install_path = join_paths(get_option('prefix'), get_option('sbindir'))
 
@@ -28,7 +29,7 @@ executable(
     'Widgets/PasswordEntry.vala',
     'Widgets/SessionButton.vala',
     config_header,
-    dependencies: [ actservice_dep, gobject_dep, glib_dep, gtk_dep, granite_dep, hdy_dep, lightdm_dep ],
+    dependencies: [ actservice_dep, gobject_dep, glib_dep, gtk_dep, granite_dep, hdy_dep, lightdm_dep, m_dep ],
     install : true,
     install_dir: install_path
 )