[gtk+] stylecontext: Store the scale value in the cascade

[Benjamin Otte <otte src gnome org>]

commit 9209c4ea411efc08a59eba12ff7898bd7be1aa05
Author: Benjamin Otte <otte redhat com>
Date:   Sat Jan 31 11:01:25 2015 +0100

    stylecontext: Store the scale value in the cascade
    
    This is in preparation for the next commits.

 gtk/gtkstylecascade.c        |   23 +++++++++++++++++++++++
 gtk/gtkstylecascadeprivate.h |    4 ++++
 gtk/gtkstylecontext.c        |   29 ++++++++++++++++++++---------
 3 files changed, 47 insertions(+), 9 deletions(-)
---
diff --git a/gtk/gtkstylecascade.c b/gtk/gtkstylecascade.c
index dd34aa1..9219d61 100644
--- a/gtk/gtkstylecascade.c
+++ b/gtk/gtkstylecascade.c
@@ -276,6 +276,8 @@ style_provider_data_clear (gpointer data_)
 static void
 _gtk_style_cascade_init (GtkStyleCascade *cascade)
 {
+  cascade->scale = 1;
+
   cascade->providers = g_array_new (FALSE, FALSE, sizeof (GtkStyleProviderData));
   g_array_set_clear_func (cascade->providers, style_provider_data_clear);
 }
@@ -373,3 +375,24 @@ _gtk_style_cascade_remove_provider (GtkStyleCascade  *cascade,
     }
 }
 
+void
+_gtk_style_cascade_set_scale (GtkStyleCascade *cascade,
+                              int              scale)
+{
+  g_return_if_fail (GTK_IS_STYLE_CASCADE (cascade));
+
+  if (cascade->scale == scale)
+    return;
+
+  cascade->scale = scale;
+
+  _gtk_style_provider_private_changed (GTK_STYLE_PROVIDER_PRIVATE (cascade));
+}
+
+int
+_gtk_style_cascade_get_scale (GtkStyleCascade *cascade)
+{
+  g_return_val_if_fail (GTK_IS_STYLE_CASCADE (cascade), 1);
+
+  return cascade->scale;
+}
diff --git a/gtk/gtkstylecascadeprivate.h b/gtk/gtkstylecascadeprivate.h
index 0bd0cb2..ad2f7e6 100644
--- a/gtk/gtkstylecascadeprivate.h
+++ b/gtk/gtkstylecascadeprivate.h
@@ -39,6 +39,7 @@ struct _GtkStyleCascade
 
   GtkStyleCascade *parent;
   GArray *providers;
+  int scale;
 };
 
 struct _GtkStyleCascadeClass
@@ -52,6 +53,9 @@ GtkStyleCascade *     _gtk_style_cascade_new                    (void);
 
 void                  _gtk_style_cascade_set_parent             (GtkStyleCascade     *cascade,
                                                                  GtkStyleCascade     *parent);
+void                  _gtk_style_cascade_set_scale              (GtkStyleCascade     *cascade,
+                                                                 int                  scale);
+int                   _gtk_style_cascade_get_scale              (GtkStyleCascade     *cascade);
 
 void                  _gtk_style_cascade_add_provider           (GtkStyleCascade     *cascade,
                                                                  GtkStyleProvider    *provider,
diff --git a/gtk/gtkstylecontext.c b/gtk/gtkstylecontext.c
index 959857d..a7f700a 100644
--- a/gtk/gtkstylecontext.c
+++ b/gtk/gtkstylecontext.c
@@ -165,7 +165,6 @@ struct _GtkStyleContextPrivate
   GtkCssNode *cssnode;
   GSList *saved_nodes;
   GArray *property_cache;
-  gint scale;
 
   guint frame_clock_update_id;
   GdkFrameClock *frame_clock;
@@ -819,7 +818,7 @@ update_properties (GtkStyleContext             *context,
                                             parent_changes,
                                             GTK_STYLE_PROVIDER_PRIVATE (priv->cascade),
                                             &matcher,
-                                            priv->scale,
+                                            _gtk_style_cascade_get_scale (priv->cascade),
                                             parent);
 
   gtk_widget_path_free (path);
@@ -851,12 +850,12 @@ build_properties (GtkStyleContext             *context,
   if (_gtk_css_matcher_init (&matcher, path))
     style = gtk_css_static_style_new_compute (GTK_STYLE_PROVIDER_PRIVATE (priv->cascade),
                                               &matcher,
-                                              priv->scale,
+                                              _gtk_style_cascade_get_scale (priv->cascade),
                                               parent);
   else
     style = gtk_css_static_style_new_compute (GTK_STYLE_PROVIDER_PRIVATE (priv->cascade),
                                               NULL,
-                                              priv->scale,
+                                              _gtk_style_cascade_get_scale (priv->cascade),
                                               parent);
 
   gtk_widget_path_free (path);
@@ -1432,14 +1431,26 @@ void
 gtk_style_context_set_scale (GtkStyleContext *context,
                              gint             scale)
 {
+  GtkStyleContextPrivate *priv;
+
   g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
 
-  if (context->priv->scale == scale)
+  priv = context->priv;
+
+  if (scale == _gtk_style_cascade_get_scale (priv->cascade))
     return;
 
-  context->priv->scale = scale;
+  if (priv->cascade == _gtk_settings_get_style_cascade (gtk_settings_get_for_screen (priv->screen)))
+    {
+      GtkStyleCascade *new_cascade;
+      
+      new_cascade = _gtk_style_cascade_new ();
+      _gtk_style_cascade_set_parent (new_cascade, priv->cascade);
+      gtk_style_context_set_cascade (context, new_cascade);
+      g_object_unref (new_cascade);
+    }
 
-  _gtk_style_context_queue_invalidate (context, GTK_CSS_CHANGE_SOURCE);
+  _gtk_style_cascade_set_scale (priv->cascade, scale);
 }
 
 /**
@@ -1457,7 +1468,7 @@ gtk_style_context_get_scale (GtkStyleContext *context)
 {
   g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), 0);
 
-  return context->priv->scale;
+  return _gtk_style_cascade_get_scale (context->priv->cascade);
 }
 
 /**
@@ -2990,7 +3001,7 @@ _gtk_style_context_validate (GtkStyleContext  *context,
                                           priv->parent ? gtk_style_context_lookup_style (priv->parent) : 
NULL,
                                           timestamp,
                                           GTK_STYLE_PROVIDER_PRIVATE (priv->cascade),
-                                          priv->scale,
+                                          _gtk_style_cascade_get_scale (priv->cascade),
                                           gtk_style_context_should_create_transitions (context, current) ? 
current : NULL);
   
       gtk_style_context_clear_cache (context);