[five-or-more/arnaudb/gtk3: 16/24] Revert "Fix background stuff."

[Arnaud B. <arnaudb src gnome org>]

commit 6bbdf03c765f43fe7c5a85d5db6f288c3c0e3805
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Thu Oct 22 17:29:06 2020 +0200

    Revert "Fix background stuff."
    
    This reverts commit 8082e192a224e826194e094db027322584c44607.

 src/view.vala | 28 ++++++++++++++++------------
 1 file changed, 16 insertions(+), 12 deletions(-)
---
diff --git a/src/view.vala b/src/view.vala
index ef9c203..a5ff89d 100644
--- a/src/view.vala
+++ b/src/view.vala
@@ -53,7 +53,6 @@ private class View : DrawingArea
     private EventControllerKey key_controller;          // for keeping in memory
     private GestureClick click_controller;              // for keeping in memory
 
-    private Gdk.RGBA background_color_rgba;
     internal const string default_background_color = "rgb(117,144,174)";
     private string _background_color = default_background_color;
     internal string background_color
@@ -61,11 +60,21 @@ private class View : DrawingArea
         internal get { return _background_color; }
         internal set
         {
-            if (!background_color_rgba.parse (value))
-                if (!background_color_rgba.parse (default_background_color))
-                    assert_not_reached ();
-            _background_color = background_color_rgba.to_string ();
+            Gdk.RGBA color = Gdk.RGBA ();
+            if (!color.parse (value))
+                _background_color = default_background_color;
+            else
+                _background_color = color.to_string ();
 
+            try
+            {
+                provider.load_from_data (".game-view { background-color: %s; }".printf (_background_color));
+            }
+            catch (Error e)
+            {
+                warning ("Failed to load CSS data to provider");
+                return;
+            }
             queue_draw ();
         }
     }
@@ -319,18 +328,13 @@ private class View : DrawingArea
     private void update_sizes (int width, int height)
     {
         piece_size = (width - 1) / game.n_cols;
-        board_rectangle.width  = piece_size * game.n_cols;
+        board_rectangle.width = piece_size * game.n_cols;
         board_rectangle.height = piece_size * game.n_rows;
     }
 
     private void fill_background (Cairo.Context cr)
     {
-        Gdk.cairo_set_source_rgba (cr, background_color_rgba);
-        cr.rectangle (/* x and y */ board_rectangle.x + 1.0,
-                                    board_rectangle.y + 1.0,
-                      /* w and h */ board_rectangle.width,
-                                    board_rectangle.height);
-        cr.fill ();
+        cs.render_background (cr, board_rectangle.x, board_rectangle.y, board_rectangle.width, 
board_rectangle.height);
     }
 
     private void draw_gridlines (Cairo.Context cr)