[gtk+] Add a function to get a font from a css style

[Matthias Clasen <matthiasc src gnome org>]

commit db50849d7918cc4337042e22b29ce13377e3d454
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Jun 3 00:29:05 2016 -0400

    Add a function to get a font from a css style
    
    Similar in spirit to
    gtk_style_context_get (ctx, state, "font", ...)
    but avoids the need for a style context.
    This will be used to for css-styled text rendering
    from css subnodes.

 gtk/gtkcssstyle.c        |   19 +++++++++++++++++++
 gtk/gtkcssstyleprivate.h |    1 +
 2 files changed, 20 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkcssstyle.c b/gtk/gtkcssstyle.c
index f4a84a1..1d607d8 100644
--- a/gtk/gtkcssstyle.c
+++ b/gtk/gtkcssstyle.c
@@ -264,3 +264,22 @@ gtk_css_style_get_pango_attributes (GtkCssStyle *style)
 
   return attrs;
 }
+
+static GtkCssValue *
+query_func (guint    id,
+            gpointer values)
+{
+  return gtk_css_style_get_value (values, id);
+}
+
+PangoFontDescription *
+gtk_css_style_get_pango_font (GtkCssStyle *style)
+{
+  GtkStyleProperty *prop;
+  GValue value = { 0, };
+
+  prop = _gtk_style_property_lookup ("font");
+  _gtk_style_property_query (prop, &value, query_func, style);
+
+  return (PangoFontDescription *)g_value_get_boxed (&value);
+}
diff --git a/gtk/gtkcssstyleprivate.h b/gtk/gtkcssstyleprivate.h
index 049574a..536b4b8 100644
--- a/gtk/gtkcssstyleprivate.h
+++ b/gtk/gtkcssstyleprivate.h
@@ -76,6 +76,7 @@ gboolean                gtk_css_style_print                     (GtkCssStyle
                                                                  gboolean                skip_initial);
 PangoAttrList *         gtk_css_style_get_pango_attributes      (GtkCssStyle            *style);
 
+PangoFontDescription *  gtk_css_style_get_pango_font            (GtkCssStyle            *style);
 
 G_END_DECLS