[gtk+] css: Implement animations for font-weight property

[Benjamin Otte <otte src gnome org>]

commit 295b8aab0c1be8bf4437637f9b69ed1c368df489
Author: Benjamin Otte <otte redhat com>
Date:   Sun Feb 15 05:37:19 2015 +0100

    css: Implement animations for font-weight property

 gtk/gtkcssenumvalue.c         |   18 +++++++++++++++++-
 gtk/gtkcssstylepropertyimpl.c |    2 +-
 2 files changed, 18 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkcssenumvalue.c b/gtk/gtkcssenumvalue.c
index 502df3e..e9ee788 100644
--- a/gtk/gtkcssenumvalue.c
+++ b/gtk/gtkcssenumvalue.c
@@ -419,11 +419,27 @@ gtk_css_value_font_weight_compute (GtkCssValue             *value,
   return _gtk_css_font_weight_value_new (new_weight);
 }
 
+static GtkCssValue *
+gtk_css_value_font_weight_transition (GtkCssValue *start,
+                                      GtkCssValue *end,
+                                      guint        property_id,
+                                      double       progress)
+{
+  PangoWeight new_weight;
+
+  if (start->value < 0 || end->value < 0)
+    return NULL;
+
+  new_weight = (start->value + end->value + 50) / 200 * 100;
+
+  return _gtk_css_font_weight_value_new (new_weight);
+}
+
 static const GtkCssValueClass GTK_CSS_VALUE_FONT_WEIGHT = {
   gtk_css_value_enum_free,
   gtk_css_value_font_weight_compute,
   gtk_css_value_enum_equal,
-  gtk_css_value_enum_transition,
+  gtk_css_value_font_weight_transition,
   gtk_css_value_enum_print
 };
 
diff --git a/gtk/gtkcssstylepropertyimpl.c b/gtk/gtkcssstylepropertyimpl.c
index 056c54f..45fa695 100644
--- a/gtk/gtkcssstylepropertyimpl.c
+++ b/gtk/gtkcssstylepropertyimpl.c
@@ -1049,7 +1049,7 @@ _gtk_css_style_property_init_properties (void)
   gtk_css_style_property_register        ("font-weight",
                                           GTK_CSS_PROPERTY_FONT_WEIGHT,
                                           PANGO_TYPE_WEIGHT,
-                                          GTK_STYLE_PROPERTY_INHERIT,
+                                          GTK_STYLE_PROPERTY_INHERIT | GTK_STYLE_PROPERTY_ANIMATED,
                                           GTK_CSS_AFFECTS_FONT | GTK_CSS_AFFECTS_TEXT,
                                           parse_pango_weight,
                                           query_pango_weight,