[gtk+/wip/hires-icons: 4/11] widget: Add _scaled() variants for icon rendering

[Carlos Garnacho <carlosg src gnome org>]

commit fad5a1d69bf835df4f4d8489db91f6d43ce113e6
Author: Carlos Garnacho <carlosg gnome org>
Date:   Tue Feb 12 14:01:15 2013 +0100

    widget: Add _scaled() variants for icon rendering
    
    Likewise to the iconfactory changes, this API allows to
    deal with stock icons at sizes that are suitable for
    gdk_window_get_scale_factor()

 gtk/gtkwidget.c |   23 +++++++++++++++++++++++
 gtk/gtkwidget.h |    4 ++++
 2 files changed, 27 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 123f396..f9411ce 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -9681,6 +9681,29 @@ gtk_widget_render_icon_pixbuf (GtkWidget   *widget,
   return gtk_icon_set_render_icon_pixbuf (icon_set, context, size);
 }
 
+GdkPixbuf*
+gtk_widget_render_icon_pixbuf_scaled (GtkWidget      *widget,
+                                      const gchar    *stock_id,
+                                      GtkIconSize     size,
+                                      gdouble        *scale)
+{
+  GtkStyleContext *context;
+  GtkIconSet *icon_set;
+
+  g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
+  g_return_val_if_fail (stock_id != NULL, NULL);
+  g_return_val_if_fail (size > GTK_ICON_SIZE_INVALID || size == -1, NULL);
+
+  context = gtk_widget_get_style_context (widget);
+  icon_set = gtk_style_context_lookup_icon_set (context, stock_id);
+
+  if (icon_set == NULL)
+    return NULL;
+
+  return gtk_icon_set_render_icon_pixbuf_scaled (icon_set, context,
+                                                 size, scale);
+}
+
 /**
  * gtk_widget_set_parent_window:
  * @widget: a #GtkWidget.
diff --git a/gtk/gtkwidget.h b/gtk/gtkwidget.h
index 1033716..751a9eb 100644
--- a/gtk/gtkwidget.h
+++ b/gtk/gtkwidget.h
@@ -1006,6 +1006,10 @@ GDK_AVAILABLE_IN_ALL
 GdkPixbuf    *gtk_widget_render_icon_pixbuf   (GtkWidget   *widget,
                                                const gchar *stock_id,
                                                GtkIconSize  size);
+GdkPixbuf    *gtk_widget_render_icon_scaled   (GtkWidget      *widget,
+                                               const gchar    *stock_id,
+                                               GtkIconSize     size,
+                                               gdouble        *scale);
 
 /* handle composite names for GTK_COMPOSITE_CHILD widgets,
  * the returned name is newly allocated.