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examples: playback-test: Fix for UI resize scenario on Windows

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Application needs to notify videosink element of video widget resize
via gst_video_overlay_set_render_rectangle() since WM_SIZE event
wouldn't be notified.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1115>
This commit is contained in:
Seungha Yang 2021-08-02 17:46:37 +09:00 committed by GStreamer Marge Bot
parent 4d3a200358
commit 0a94da9611
1 changed files with 44 additions and 0 deletions
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44
subprojects/gst-plugins-base/tests/examples/playback/playback-test.c
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@ -2227,6 +2227,13 @@ draw_cb (GtkWidget * widget, cairo_t * cr, PlaybackApp * app)
return TRUE;
}
/* "prepare-window-handle" message might not be posted yet depending on
* videosink implementation */
if (!app->overlay_element) {
app->overlay_element = gst_bin_get_by_interface (GST_BIN (app->pipeline),
GST_TYPE_VIDEO_OVERLAY);
}
if (app->overlay_element)
gst_video_overlay_expose (GST_VIDEO_OVERLAY (app->overlay_element));
@ -2311,6 +2318,39 @@ motion_notify_cb (GtkWidget * widget, GdkEventMotion * event, PlaybackApp * app)
return FALSE;
}
#ifdef G_OS_WIN32
/* On Windows, videosink elements expect full-size overlay window handle.
* And an expectation for window resize scenario is that WM_SIZE event of
* parent HWND is forwarded to child window.
* But some GUI applications like GTK might handle WM_SIZE event by themselves
* and therefore child HWND wouldn't be able to understand any resize event.
*
* In this example, we will watch "configure-event" of GTK widget and
* GstVideoOverlay::set_render_rectangle() will be used to notify videosink
* elements of resized render area.
*/
static gboolean
configure_event_cb (GtkWidget * widget, GdkEventConfigure * event,
PlaybackApp * app)
{
/* GdkEventConfigure::x and GdkEventConfigure::y are positions of this
* video widget relative to parent. So, we should not forward it to videosink.
* From videosink point of view, its parent window is this video widget */
if (!app->overlay_element) {
app->overlay_element = gst_bin_get_by_interface (GST_BIN (app->pipeline),
GST_TYPE_VIDEO_OVERLAY);
}
if (app->overlay_element) {
gst_video_overlay_set_render_rectangle (GST_VIDEO_OVERLAY
(app->overlay_element), 0, 0, event->width, event->height);
}
return FALSE;
}
#endif
static void
msg_eos (GstBus * bus, GstMessage * message, PlaybackApp * app)
{
@ -2682,6 +2722,10 @@ create_ui (PlaybackApp * app)
G_CALLBACK (key_release_cb), app);
g_signal_connect (app->video_window, "motion-notify-event",
G_CALLBACK (motion_notify_cb), app);
#ifdef G_OS_WIN32
g_signal_connect (app->video_window, "configure-event",
G_CALLBACK (configure_event_cb), app);
#endif
gtk_widget_set_can_focus (app->video_window, TRUE);
gtk_widget_add_events (app->video_window,
GDK_POINTER_MOTION_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK