[dia/dia-0-97] Bug 694025 - GLib drop support for adding interfaces after class_init

[Hans Breuer <hans src gnome org>]

commit 7ac3e9ffac09f99a1aa2fe97a4dc0a688c9746b0
Author: Hans Breuer <hans breuer org>
Date:   Sat Mar 16 17:56:58 2013 +0100

    Bug 694025 - GLib drop support for adding interfaces after class_init
    
    Without this Dia crashes at startup with new GLib version and the
    DiaGdkRenderer being default. Make a new DiaGdkInteractiveRenderer which
    follows the pattern also used for DiaCairoInteraciveRenderer. This should
    be functional equivalent to what was there before and should work for all
    current GLib versions.
    
    (cherry picked from commit 213bdfe956bf8fe57c86316f68a09408fef1647e)

 app/render_gdk.c |   60 +++++++++++++++++++++++++++++++++--------------------
 1 files changed, 37 insertions(+), 23 deletions(-)
---
diff --git a/app/render_gdk.c b/app/render_gdk.c
index 60ccb7a..b1e7ba4 100644
--- a/app/render_gdk.c
+++ b/app/render_gdk.c
@@ -50,7 +50,21 @@ static void copy_to_window (DiaRenderer *renderer,
                 gpointer window,
                 int x, int y, int width, int height);
 
-static void dia_gdk_renderer_iface_init (DiaInteractiveRendererInterface* iface)
+typedef struct _DiaGdkInteractiveRenderer DiaGdkInteractiveRenderer;
+struct _DiaGdkInteractiveRenderer
+{
+  DiaGdkRenderer parent_instance; /*!< inheritance in object oriented C */
+};
+typedef struct _DiaGdkInteractiveRendererClass DiaGdkInteractiveRendererClass;
+struct _DiaGdkInteractiveRendererClass
+{
+  DiaGdkRendererClass parent_class; /*!< the base class */
+};
+#define DIA_TYPE_GDK_INTERACTIVE_RENDERER           (dia_gdk_interactive_renderer_get_type ())
+#define DIA_GDK_INTERACTIVE_RENDERER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), 
DIA_TYPE_GDK_INTERACTIVE_RENDERER, DiaGdkInteractiveRenderer))
+
+static void
+dia_gdk_renderer_iface_init (DiaInteractiveRendererInterface* iface)
 {
   iface->clip_region_clear = clip_region_clear;
   iface->clip_region_add_rect = clip_region_add_rect;
@@ -61,35 +75,35 @@ static void dia_gdk_renderer_iface_init (DiaInteractiveRendererInterface* iface)
   iface->set_size = set_size;
 }
 
+G_DEFINE_TYPE_WITH_CODE (DiaGdkInteractiveRenderer, dia_gdk_interactive_renderer, DIA_TYPE_GDK_RENDERER,
+                        G_IMPLEMENT_INTERFACE (DIA_TYPE_INTERACTIVE_RENDERER_INTERFACE, 
dia_gdk_renderer_iface_init));
+
+static void
+dia_gdk_interactive_renderer_class_init(DiaGdkInteractiveRendererClass *klass)
+{
+}
+static void
+dia_gdk_interactive_renderer_init(DiaGdkInteractiveRenderer *object)
+{
+  DiaGdkInteractiveRenderer *ia_renderer = DIA_GDK_INTERACTIVE_RENDERER (object);
+  DiaGdkRenderer *renderer = DIA_GDK_RENDERER(object);
+  DiaRenderer *dia_renderer = DIA_RENDERER(object);
+  
+  dia_renderer->is_interactive = 1;
+
+  renderer->gc = NULL;
+  renderer->pixmap = NULL;
+  renderer->clip_region = NULL;
+}
+
 DiaRenderer *
 new_gdk_renderer(DDisplay *ddisp)
 {
   DiaGdkRenderer *renderer;
   GType renderer_type = 0;
 
-  renderer = g_object_new (DIA_TYPE_GDK_RENDERER, NULL);
+  renderer = g_object_new (DIA_TYPE_GDK_INTERACTIVE_RENDERER, NULL);
   renderer->transform = dia_transform_new (&ddisp->visible, &ddisp->zoom_factor);
-  if (!DIA_GET_INTERACTIVE_RENDERER_INTERFACE (renderer))
-    {
-      static const GInterfaceInfo irenderer_iface_info = 
-      {
-        (GInterfaceInitFunc) dia_gdk_renderer_iface_init,
-        NULL,           /* iface_finalize */
-        NULL            /* iface_data     */
-      };
-
-      renderer_type = DIA_TYPE_GDK_RENDERER;
-      /* register the interactive renderer interface */
-      g_type_add_interface_static (renderer_type,
-                                   DIA_TYPE_INTERACTIVE_RENDERER_INTERFACE,
-                                   &irenderer_iface_info);
-
-    }
-  renderer->parent_instance.is_interactive = 1;
-  renderer->gc = NULL;
-
-  renderer->pixmap = NULL;
-  renderer->clip_region = NULL;
 
   return DIA_RENDERER(renderer);
 }