diff --git a/gdk-pixbuf/ChangeLog b/gdk-pixbuf/ChangeLog
index d6eef083cb..f83c61cc2d 100644
--- a/gdk-pixbuf/ChangeLog
+++ b/gdk-pixbuf/ChangeLog
@@ -1,3 +1,8 @@
+1999-10-26  Jonathan Blandford  <jrb@redhat.com>
+
+	* src/gdk-pixbuf-loader.h: New Class.  Beginning of progrssive
+	loading.
+
 1999-10-25  Federico Mena Quintero  <federico@redhat.com>
 
 	* configure.in (CFLAGS): Patch from Uwe Koloska
diff --git a/gdk-pixbuf/gdk-pixbuf-loader.h b/gdk-pixbuf/gdk-pixbuf-loader.h
index 81ba0f58b7..90b481fda9 100644
--- a/gdk-pixbuf/gdk-pixbuf-loader.h
+++ b/gdk-pixbuf/gdk-pixbuf-loader.h
@@ -56,11 +56,12 @@ struct _GdkPixbufLoader
 typedef struct _GdkPixbufLoaderClass GdkPixbufLoaderClass;
 struct _GdkPixbufLoaderClass {
 	GtkObjectClass parent_class;
-#if 0
-	/* If it get's implemented */
+
 	void (* area_updated) (GdkPixbufLoader *loader,
 			       int x, int y, int width, int height);
-#endif
+	void (* area_prepared) (GdkPixbufLoader *loader,
+				GdkPixbuf *image,
+				int x, int y, int width, int height);
 };
 
 
diff --git a/gdk-pixbuf/io-png.c b/gdk-pixbuf/io-png.c
index 5b07a4feed..b9caaf7db8 100644
--- a/gdk-pixbuf/io-png.c
+++ b/gdk-pixbuf/io-png.c
@@ -134,3 +134,9 @@ image_load (FILE *f)
 						 w, h, w * 3,
 						 free_buffer, NULL);
 }
+
+GdkImage *
+image_load_by_data (void *data, size_t count)
+{
+	return NULL;
+}
diff --git a/gtk/gdk-pixbuf-loader.h b/gtk/gdk-pixbuf-loader.h
index 81ba0f58b7..90b481fda9 100644
--- a/gtk/gdk-pixbuf-loader.h
+++ b/gtk/gdk-pixbuf-loader.h
@@ -56,11 +56,12 @@ struct _GdkPixbufLoader
 typedef struct _GdkPixbufLoaderClass GdkPixbufLoaderClass;
 struct _GdkPixbufLoaderClass {
 	GtkObjectClass parent_class;
-#if 0
-	/* If it get's implemented */
+
 	void (* area_updated) (GdkPixbufLoader *loader,
 			       int x, int y, int width, int height);
-#endif
+	void (* area_prepared) (GdkPixbufLoader *loader,
+				GdkPixbuf *image,
+				int x, int y, int width, int height);
 };