Added support for foreign windows to the Win32 backend.

* clutter/win32/clutter-stage-win32.c
	(clutter_stage_win32_request_coords): Don't resize foreign
	windows.
	(clutter_stage_win32_unrealize): Don't destroy foreign windows.
	(clutter_stage_win32_init): Added initialiser for is_foreign_win.
	(clutter_win32_get_stage_from_window): Resort to looking in the
	stage list if the window isn't the right window class so that it
	can still find stages with foreign windows.
	(clutter_win32_set_stage_foreign): New public function to set a
	foreign window for a stage.

	* clutter/win32/clutter-event-win32.c
	(clutter_win32_disable_event_retrieval): New public function to
	disable event retrieval.
	(message_translate): Don't handle WM_SIZE or WM_MOVE for foreign
	windows.

	* clutter/win32/clutter-backend-win32.h (struct
	_ClutterBackendWin32): Added a flag to disable event retrieval

	* clutter/win32/clutter-backend-win32.c
	(clutter_backend_win32_ensure_context): Update debug note to
	include whether the stage is foreign or not.

ChangeLog

@@ -1,3 +1,31 @@
+2008-04-15  Neil Roberts  <neil@o-hand.com>
+
+	Added support for foreign windows to the Win32 backend.
+
+	* clutter/win32/clutter-stage-win32.c
+	(clutter_stage_win32_request_coords): Don't resize foreign
+	windows.
+	(clutter_stage_win32_unrealize): Don't destroy foreign windows.
+	(clutter_stage_win32_init): Added initialiser for is_foreign_win.
+	(clutter_win32_get_stage_from_window): Resort to looking in the
+	stage list if the window isn't the right window class so that it
+	can still find stages with foreign windows.
+	(clutter_win32_set_stage_foreign): New public function to set a
+	foreign window for a stage.
+
+	* clutter/win32/clutter-event-win32.c
+	(clutter_win32_disable_event_retrieval): New public function to
+	disable event retrieval.
+	(message_translate): Don't handle WM_SIZE or WM_MOVE for foreign
+	windows.
+
+	* clutter/win32/clutter-backend-win32.h (struct
+	_ClutterBackendWin32): Added a flag to disable event retrieval
+
+	* clutter/win32/clutter-backend-win32.c
+	(clutter_backend_win32_ensure_context): Update debug note to
+	include whether the stage is foreign or not.
+
 2008-04-15  Øyvind Kolås  <pippin@o-hand.com>
 
 	* clutter/clutter-actor.c: (clutter_actor_set_shader_param): queue a

clutter/win32/clutter-backend-win32.c

@@ -269,8 +269,9 @@ clutter_backend_win32_ensure_context (ClutterBackend *backend,
       else
 	{
 	  CLUTTER_NOTE (BACKEND,
-			"MakeCurrent window %p, context %p",
+			"MakeCurrent window %p (%s), context %p",
 			stage_win32->hwnd,
+			stage_win32->is_foreign_win ? "foreign" : "native",
 			backend_win32->gl_context);
 	  wglMakeCurrent (stage_win32->client_dc,
 			  backend_win32->gl_context);
@@ -367,6 +368,7 @@ clutter_backend_win32_init (ClutterBackendWin32 *backend_win32)
   ClutterBackend *backend = CLUTTER_BACKEND (backend_win32);
 
   backend_win32->gl_context         = NULL;
+  backend_win32->no_event_retrieval = FALSE;
 
   /* FIXME: get from GetSystemMetric? */
   clutter_backend_set_double_click_time (backend, 250);

clutter/win32/clutter-backend-win32.h

@@ -46,6 +46,7 @@ struct _ClutterBackendWin32
   ClutterBackend parent_instance;
 
   HGLRC          gl_context;
+  gboolean       no_event_retrieval;
 
   GSource       *event_source;
 };

clutter/win32/clutter-event-win32.c

@@ -212,6 +212,28 @@ make_button_event (const MSG *msg, ClutterEvent *event,
   event->button.click_count = click_count;
 }
 
+/**
+ * clutter_win32_disable_event_retrieval
+ *
+ * Disables retrieval of Windows messages in the main loop. Use to
+ * create event-less canvas.
+ *
+ * This function can only be called before calling clutter_init().
+ *
+ * Since: 0.8
+ */
+void
+clutter_win32_disable_event_retrieval (void)
+{
+  ClutterBackendWin32 *backend;
+  ClutterMainContext  *clutter_context;
+
+  clutter_context = clutter_context_get_default ();
+  backend = CLUTTER_BACKEND_WIN32 (clutter_context->backend);
+
+  backend->no_event_retrieval = TRUE;
+}
+
 static gboolean
 clutter_event_prepare (GSource *source,
                        gint    *timeout)
@@ -327,6 +349,7 @@ message_translate (ClutterBackend *backend,
   switch (msg->message)
     {
     case WM_SIZE:
+      if (!stage_win32->is_foreign_win)
 	{
 	  WORD new_width = LOWORD (msg->lParam);
 	  WORD new_height = HIWORD (msg->lParam);
@@ -343,6 +366,7 @@ message_translate (ClutterBackend *backend,
       break;
 
     case WM_MOVE:
+      if (!stage_win32->is_foreign_win)
 	{
 	  WORD new_xpos = GET_X_LPARAM (msg->lParam);
 	  WORD new_ypos = GET_Y_LPARAM (msg->lParam);

clutter/win32/clutter-stage-win32.c

@@ -206,7 +206,7 @@ clutter_stage_win32_request_coords (ClutterActor        *self,
       stage_win32->win_width = new_width;
       stage_win32->win_height = new_height;
 
-      if (stage_win32->hwnd != NULL)
+      if (stage_win32->hwnd != NULL && !stage_win32->is_foreign_win)
 	{
 	  int full_xpos, full_ypos, full_width, full_height;
 
@@ -576,7 +576,7 @@ clutter_stage_win32_unrealize (ClutterActor *actor)
       stage_win32->client_dc = NULL;
     }
 
-  if (stage_win32->hwnd)
+  if (!stage_win32->is_foreign_win && stage_win32->hwnd)
     {
       /* Drop the pointer to this stage in the window so that any
 	 further messages won't be processed. The stage might be being
@@ -626,6 +626,7 @@ clutter_stage_win32_init (ClutterStageWin32 *stage)
   stage->win_height = 480;
   stage->backend = NULL;
   stage->scroll_pos = 0;
+  stage->is_foreign_win = FALSE;
 
   stage->wrapper = NULL;
   	 
@@ -687,9 +688,86 @@ clutter_win32_get_stage_from_window (HWND hwnd)
        extra data */
     return CLUTTER_STAGE_WIN32 (GetWindowLongPtrW (hwnd, 0))->wrapper;
   else
+    {
+      /* Otherwise it might be a foreign window so we should check the
+	 stage list */
+      ClutterMainContext  *context = clutter_context_get_default ();
+      ClutterStageManager *stage_manager = context->stage_manager;
+      GSList              *l;
+
+      for (l = stage_manager->stages; l; l = l->next)
+	{
+	  ClutterStage *stage = l->data;
+	  ClutterStageWindow *impl;
+
+	  impl = _clutter_stage_get_window (stage);
+	  g_assert (CLUTTER_IS_STAGE_WIN32 (impl));
+
+	  if (CLUTTER_STAGE_WIN32 (impl)->hwnd == hwnd)
+	    return stage;
+	}
+    }
+
   return NULL;
 }
   	 
+/**
+ * clutter_win32_set_stage_foreign:
+ * @stage: a #ClutterStage
+ * @hwnd: an existing window handle
+ *
+ * Target the #ClutterStage to use an existing external window handle.
+ *
+ * Return value: %TRUE if foreign window is valid
+ *
+ * Since: 0.8
+ */
+gboolean
+clutter_win32_set_stage_foreign (ClutterStage *stage,
+				 HWND          hwnd)
+{
+  ClutterStageWin32 *stage_win32;
+  ClutterStageWindow *impl;
+  ClutterActor *actor;
+  RECT client_rect;
+  POINT window_pos;
+  ClutterGeometry geom;
+
+  g_return_val_if_fail (CLUTTER_IS_STAGE (stage), FALSE);
+  g_return_val_if_fail (hwnd != NULL, FALSE);
+
+  actor = CLUTTER_ACTOR (stage);
+
+  impl = _clutter_stage_get_window (stage);
+  stage_win32 = CLUTTER_STAGE_WIN32 (impl);
+
+  clutter_actor_unrealize (actor);
+
+  if (!GetClientRect (hwnd, &client_rect))
+    {
+      g_warning ("Unable to retrieve the new window geometry");
+      return FALSE;
+    }
+  window_pos.x = client_rect.left;
+  window_pos.y = client_rect.right;
+  ClientToScreen (hwnd, &window_pos);
+
+  CLUTTER_NOTE (BACKEND, "Setting foreign window (0x%x)", (int) hwnd);
+
+  stage_win32->hwnd = hwnd;
+  stage_win32->is_foreign_win = TRUE;
+
+  geom.x = window_pos.x;
+  geom.y = window_pos.y;
+  geom.width = client_rect.right - client_rect.left;
+  geom.height = client_rect.bottom - client_rect.top;
+
+  clutter_actor_set_geometry (actor, &geom);
+  clutter_actor_realize (actor);
+
+  return TRUE;
+}
+
 void
 clutter_stage_win32_map (ClutterStageWin32 *stage_win32)
 {

clutter/win32/clutter-stage-win32.h

@@ -52,6 +52,7 @@ struct _ClutterStageWin32
   gint         win_height;
   gint         scroll_pos;
   RECT         fullscreen_rect;
+  gboolean     is_foreign_win;
 
   ClutterBackendWin32 *backend;
   ClutterStageState   state;

clutter/win32/clutter-win32.h

@@ -46,6 +46,11 @@ G_BEGIN_DECLS
 HWND          clutter_win32_get_stage_window        (ClutterStage *stage);
 ClutterStage *clutter_win32_get_stage_from_window   (HWND          hwnd);
 
+gboolean      clutter_win32_set_stage_foreign       (ClutterStage *stage,
+                                                     HWND          hwnd);
+
+void          clutter_win32_disable_event_retrieval (void);
+
 G_END_DECLS
 
 #endif /* __CLUTTER_WIN32_H__ */