[349/906] can switch xoverlays while playing

Fixes bug #584877

Before this commit calling "gst_x_overlay_set_xwindow_id" more
than one time, had no effect.
It mainly affects the glimagesink implementation.
But on win32 (and CE), some stuff has to be done to
release the old parent.

And add a switchxoverlay example where the user
can click on left/right part of the main window to
switch the xoverlay.

gst-libs/gst/gl/gstglwindow_win32.c

@@ -197,10 +197,37 @@ void
 gst_gl_window_set_external_window_id (GstGLWindow * window, gulong id)
 {
   GstGLWindowPrivate *priv = window->priv;
+
+  //retrieve parent if previously set
+  HWND parent_id = GetProp (priv->internal_win_id, "gl_window_parent_id");
+
+  if (priv->visible) {
+      ShowWindow (priv->internal_win_id, SW_HIDE);
+      priv->visible = FALSE;
+   }
+  
+  if (parent_id) {
+    WNDPROC parent_proc = GetProp (parent_id, "gl_window_parent_proc");
+
+    g_debug ("release parent %lud\n", (gulong) parent_id);
+
+    g_assert (parent_proc);
+
+    SetWindowLongPtr (parent_id, GWL_WNDPROC, (LONG) parent_proc);
+    SetParent (priv->internal_win_id, NULL);
+
+    RemoveProp (parent_id, "gl_window_parent_proc");
+    RemoveProp (priv->internal_win_id, "gl_window_parent_id");
+  }
+
+  //not 0
+  if (id) {
     WNDPROC window_parent_proc =
         (WNDPROC) GetWindowLongPtr ((HWND) id, GWL_WNDPROC);
     RECT rect;
 
+    g_debug ("set parent %lud\n", (gulong) id);
+
     SetProp (priv->internal_win_id, "gl_window_parent_id", (HWND) id);
     SetProp ((HWND) id, "gl_window_id", priv->internal_win_id);
     SetProp ((HWND) id, "gl_window_parent_proc", (WNDPROC) window_parent_proc);
@@ -217,6 +244,11 @@ gst_gl_window_set_external_window_id (GstGLWindow * window, gulong id)
         SWP_FRAMECHANGED | SWP_NOACTIVATE);
     MoveWindow (priv->internal_win_id, rect.left, rect.top, rect.right,
         rect.bottom, FALSE);
+  } else {
+    //no parent so the internal window needs borders and system menu
+    SetWindowLongPtr (priv->internal_win_id, GWL_STYLE,
+      WS_CLIPSIBLINGS | WS_CLIPCHILDREN | WS_OVERLAPPEDWINDOW);
+  }
 }
 
 /* Must be called in the gl thread */

gst-libs/gst/gl/gstglwindow_winCE.c

@@ -204,14 +204,41 @@ void
 gst_gl_window_set_external_window_id (GstGLWindow * window, gulong id)
 {
   GstGLWindowPrivate *priv = window->priv;
+
+  //retrieve parent if previously set
+  HWND parent_id = GetProp (priv->internal_win_id, "gl_window_parent_id");
+
+  if (priv->visible) {
+      ShowWindow (priv->internal_win_id, SW_HIDE);
+      priv->visible = FALSE;
+   }
+  
+  if (parent_id) {
+    WNDPROC parent_proc = GetProp (parent_id, "gl_window_parent_proc");
+
+    g_debug ("release parent %lud\n", (gulong) parent_id);
+
+    g_assert (parent_proc);
+
+    SetWindowLongPtr (parent_id, GWL_WNDPROC, (LONG) parent_proc);
+    SetParent (priv->internal_win_id, NULL);
+
+    RemoveProp (parent_id, "gl_window_parent_proc");
+    RemoveProp (priv->internal_win_id, "gl_window_parent_id");
+  }
+
+  //not 0
+  if (id) {
     WNDPROC window_parent_proc =
-      (WNDPROC) (guint64) GetWindowLongPtr ((HWND) id, GWL_WNDPROC);
+        (WNDPROC) GetWindowLongPtr ((HWND) id, GWL_WNDPROC);
     RECT rect;
 
+    g_debug ("set parent %lud\n", (gulong) id);
+
     SetProp (priv->internal_win_id, "gl_window_parent_id", (HWND) id);
     SetProp ((HWND) id, "gl_window_id", priv->internal_win_id);
     SetProp ((HWND) id, "gl_window_parent_proc", (WNDPROC) window_parent_proc);
-  SetWindowLongPtr ((HWND) id, GWL_WNDPROC, (DWORD) (guint64) sub_class_proc);
+    SetWindowLongPtr ((HWND) id, GWL_WNDPROC, (LONG_PTR) sub_class_proc);
 
     SetWindowLongPtr (priv->internal_win_id, GWL_STYLE, WS_CHILD | WS_MAXIMIZE);
     SetParent (priv->internal_win_id, (HWND) id);
@@ -224,6 +251,11 @@ gst_gl_window_set_external_window_id (GstGLWindow * window, gulong id)
         SWP_FRAMECHANGED | SWP_NOACTIVATE);
     MoveWindow (priv->internal_win_id, rect.left, rect.top, rect.right,
         rect.bottom, FALSE);
+  } else {
+    //no parent so the internal window needs borders and system menu
+    SetWindowLongPtr (priv->internal_win_id, GWL_STYLE,
+      WS_CLIPSIBLINGS | WS_CLIPCHILDREN | WS_OVERLAPPEDWINDOW);
+  }
 }
 
 /* Must be called in the gl thread */

gst/gl/gstglimagesink.c

@@ -251,6 +251,7 @@ gst_glimage_sink_init (GstGLImageSink * glimage_sink,
 {
   glimage_sink->display_name = NULL;
   glimage_sink->window_id = 0;
+  glimage_sink->new_window_id = 0;
   glimage_sink->display = NULL;
   glimage_sink->stored_buffer = NULL;
   glimage_sink->clientReshapeCallback = NULL;
@@ -416,6 +417,9 @@ gst_glimage_sink_stop (GstBaseSink * bsink)
     glimage_sink->display = NULL;
   }
 
+  glimage_sink->window_id = 0;
+  //but do not reset glimage_sink->new_window_id
+
   return TRUE;
 }
 
@@ -485,7 +489,7 @@ gst_glimage_sink_set_caps (GstBaseSink * bsink, GstCaps * caps)
   glimage_sink->par_n = par_n;
   glimage_sink->par_d = par_d;
 
-  if (!glimage_sink->window_id)
+  if (!glimage_sink->window_id && !glimage_sink->new_window_id)
     gst_x_overlay_prepare_xwindow_id (GST_X_OVERLAY (glimage_sink));
 
   return TRUE;
@@ -510,10 +514,6 @@ gst_glimage_sink_render (GstBaseSink * bsink, GstBuffer * buf)
     if (glimage_sink->display == NULL) {
       glimage_sink->display = g_object_ref (gl_buffer->display);
 
-      if (glimage_sink->window_id)
-        gst_gl_display_set_window_id (glimage_sink->display,
-            glimage_sink->window_id);
-
       gst_gl_display_set_client_reshape_callback (glimage_sink->display,
           glimage_sink->clientReshapeCallback);
 
@@ -532,10 +532,6 @@ gst_glimage_sink_render (GstBaseSink * bsink, GstBuffer * buf)
       gst_gl_display_create_context (glimage_sink->display,
           glimage_sink->width, glimage_sink->height, 0);
 
-      if (glimage_sink->window_id)
-        gst_gl_display_set_window_id (glimage_sink->display,
-            glimage_sink->window_id);
-
       //init colorspace conversion if needed
       gst_gl_display_init_upload (glimage_sink->display, glimage_sink->format,
           glimage_sink->width, glimage_sink->height,
@@ -558,6 +554,12 @@ gst_glimage_sink_render (GstBaseSink * bsink, GstBuffer * buf)
     //gl_buffer is created in this block, so the gl buffer is already referenced
   }
 
+  if (glimage_sink->window_id != glimage_sink->new_window_id) {
+    glimage_sink->window_id = glimage_sink->new_window_id;
+    gst_gl_display_set_window_id (glimage_sink->display,
+        glimage_sink->window_id);
+  }
+
   //the buffer is cleared when an other comes in
   if (glimage_sink->stored_buffer) {
     gst_buffer_unref (GST_BUFFER_CAST (glimage_sink->stored_buffer));
@@ -594,11 +596,7 @@ gst_glimage_sink_set_xwindow_id (GstXOverlay * overlay, gulong window_id)
 
   GST_DEBUG ("set_xwindow_id %ld", window_id);
 
-  if (glimage_sink->window_id == window_id)
-    return;
-
-  if (window_id)
-    glimage_sink->window_id = window_id;
+  glimage_sink->new_window_id = window_id;
 }
 
 

gst/gl/gstglimagesink.h

@@ -53,6 +53,7 @@ struct _GstGLImageSink
     gchar *display_name;
 
     gulong window_id;
+    gulong new_window_id;
 
     //caps
     GstCaps *caps;