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glwindow: Add "window-handle-changed" signal

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This allow other objects to clear any wrapper object that depends
on the previous handle, and properly re-create the new wrappers without
having to resort into doing pointer comparison.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/1231>
This commit is contained in:
Nicolas Dufresne 2021-07-22 17:02:51 -04:00
parent f72b3cf199
commit efa6d1c2f8
1 changed files with 23 additions and 0 deletions
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23
gst-libs/gst/gl/gstglwindow.c
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@ -127,6 +127,7 @@ enum
EVENT_MOUSE_SIGNAL,
EVENT_KEY_SIGNAL,
EVENT_SCROLL_SIGNAL,
WINDOW_HANDLE_CHANGED_SIGNAL,
LAST_SIGNAL
};
@ -253,6 +254,22 @@ gst_gl_window_class_init (GstGLWindowClass * klass)
G_TYPE_NONE, 4, G_TYPE_DOUBLE, G_TYPE_DOUBLE, G_TYPE_DOUBLE,
G_TYPE_DOUBLE);
/**
* GstGLWindow::window-handle-changed:
* @object: the #GstGLWindow
*
* Will be emitted when the window handle has been set into the native
* implementation, but before the context is re-activated. By using this
* signal, elements can refresh associated resource without relying on
* direct handle comparision.
*
* Since: 1.20
*/
gst_gl_window_signals[WINDOW_HANDLE_CHANGED_SIGNAL] =
g_signal_new ("window-handle_changed", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, 0, NULL, NULL, g_cclosure_marshal_generic,
G_TYPE_NONE, 0);
_init_debug ();
}
@ -381,6 +398,12 @@ _set_window_handle_cb (GstSetWindowHandleCb * data)
window_class->set_window_handle (data->window, data->handle);
/* Let's assume users don't call this without a new handle, this is the
* safest since we don't know the nature of the handle and direct
* comparision might not be safe */
g_signal_emit (data->window,
gst_gl_window_signals[WINDOW_HANDLE_CHANGED_SIGNAL], 0, NULL);
/* reactivate */
if (context && thread)
gst_gl_context_activate (context, TRUE);