Introduce interfaces and classes for built-in thumbnailers.

This commit introduces the TumblerThumbnailer interface which is
supposed to be implemented twice, once for built-in thumbnailers that
run in the same process as tumbler itself, and once for specialized
thumbnailers which talk to tumbler over D-Bus. TumblerThumbnailer
provides a function for creating a thumbnail plus "ready" and "error"
signals. Their signatures may still change though.

TumblerBuiltinThumbnailer is a new class for built-in thumbnailers. It
is a little similar to ExoSimpleJob in that it allows built-in
thumbnailers to be created by defining a create function and a list of
mime types.

Also new is tumbler_pixbuf_thumbnailer_new() which creates a pixbuf
thumbnailer. It's just a skeleton for now.

TumblerRegistry now has a method tumbler_registry_add() for adding a
new TumblerThumbnailer to the registry.

Last but not least, there's tumbler-marshal.list for custom marshallers
now.

1 files changed, 62 insertions, 0 deletions

diff --git a/tumbler/tumbler-thumbnailer.h b/tumbler/tumbler-thumbnailer.h
new file mode 100644
index 0000000..2301471
--- /dev/null
+++ b/tumbler/tumbler-thumbnailer.h
@@ -0,0 +1,62 @@
+/* vi:set et ai sw=2 sts=2 ts=2: */
+/*-
+ * Copyright (c) 2009 Jannis Pohlmann <jannis@xfce.org>
+ *
+ * This program is free software; you can redistribute it and/or 
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of 
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public 
+ * License along with this program; if not, write to the Free 
+ * Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __TUMBLER_THUMBNAILER_H__
+#define __TUMBLER_THUMBNAILER_H__
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define TUMBLER_TYPE_THUMBNAILER           (tumbler_thumbnailer_get_type ())
+#define TUMBLER_THUMBNAILER(obj)           (G_TYPE_CHECK_INSTANCE_CAST ((obj), TUMBLER_TYPE_THUMBNAILER, TumblerThumbnailer))
+#define TUMBLER_IS_THUMBNAILER(obj)        (G_TYPE_CHECK_INSTANCE_TYPE ((obj), TUMBLER_TYPE_THUMBNAILER))
+#define TUMBLER_THUMBNAILER_GET_IFACE(obj) (G_TYPE_INSTANCE_GET_INTERFACE ((obj), TUMBLER_TYPE_THUMBNAILER, TumblerThumbnailerIface))
+
+typedef struct _TumblerThumbnailer      TumblerThumbnailer;
+typedef struct _TumblerThumbnailerIface TumblerThumbnailerIface;
+
+struct _TumblerThumbnailerIface
+{
+  GTypeInterface __parent__;
+
+  /* signals */
+  void (*ready)  (TumblerThumbnailer *thumbnailer,
+                  const gchar        *uri);
+  void (*error)  (TumblerThumbnailer *thumbnailer,
+                  const gchar        *failed_uri,
+                  gint                error_code,
+                  const gchar        *message);
+
+  /* virtual methods */
+  void (*create) (TumblerThumbnailer *thumbnailer,
+                  const gchar        *uri,
+                  const gchar        *mime_hint);
+};
+
+GType tumbler_thumbnailer_get_type (void) G_GNUC_CONST;
+
+void  tumbler_thumbnailer_create   (TumblerThumbnailer *thumbnailer,
+                                    const gchar        *uri,
+                                    const gchar        *mime_hint);
+
+G_END_DECLS
+
+#endif /* !__TUMBLER_THUMBNAILER_H__ */