[gtk/matthiasc/gl-media-stream] fishbowl: Add a "video view" for comparison

[Matthias Clasen <matthiasc src gnome org>]

commit bc9bc96049d479c9815d83cbf14142bd9e948a3f
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Jan 2 10:01:50 2021 -0500

    fishbowl: Add a "video view" for comparison
    
    This is like the Video case, but uses a single
    media stream with multiple views.

 demos/gtk-demo/fishbowl.c | 52 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
---
diff --git a/demos/gtk-demo/fishbowl.c b/demos/gtk-demo/fishbowl.c
index 4c596b9e48..96254029e7 100644
--- a/demos/gtk-demo/fishbowl.c
+++ b/demos/gtk-demo/fishbowl.c
@@ -146,6 +146,57 @@ create_video (void)
   return w;
 }
 
+static GtkMediaStream *view_stream;
+static int n_views;
+
+static void
+on_map_view (GtkWidget *w)
+{
+  if (n_views == 0)
+    {
+      GdkSurface *surface;
+
+      surface = gtk_native_get_surface (gtk_widget_get_native (w));
+
+      view_stream = gtk_media_file_new ();
+
+      gtk_media_stream_realize (view_stream, surface);
+      gtk_media_stream_set_loop (view_stream, TRUE);
+
+      gtk_media_file_set_resource (GTK_MEDIA_FILE (view_stream), "/images/gtk-logo.webm");
+
+      gtk_media_stream_play (view_stream);
+    }
+
+  gtk_picture_set_paintable (GTK_PICTURE (w), GDK_PAINTABLE (view_stream));
+  n_views++;
+}
+
+static void
+on_unrealize_view (GtkWidget *w)
+{
+  n_views--;
+
+  if (n_views == 0)
+    {
+      gtk_media_stream_pause (view_stream);
+      g_clear_object (&view_stream);
+    }
+}
+
+static GtkWidget *
+create_video_view (void)
+{
+  GtkWidget *w = gtk_picture_new ();
+
+  gtk_widget_set_size_request (w, 128, 128);
+
+  g_signal_connect_after (w, "map", G_CALLBACK (on_map_view), NULL);
+  g_signal_connect_after (w, "unrealize", G_CALLBACK (on_unrealize_view), NULL);
+
+  return w;
+}
+
 static GtkWidget *
 create_gears (void)
 {
@@ -231,6 +282,7 @@ static const struct {
   { "Spinner",    create_spinner        },
   { "Spinbutton", create_spinbutton     },
   { "Video",      create_video          },
+  { "Video View", create_video_view     },
   { "Gears",      create_gears          },
   { "Switch",     create_switch         },
   { "Menubutton", create_menu_button    },