gtk: Translate navigation events coordinates

If the application passed down some pointer coordinates, translate those
from display coordinates to stream coordinates, so things work as
expected even if the video is resized.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/974>

diff --git a/ext/gtk/gstgtkbasesink.c b/ext/gtk/gstgtkbasesink.c
index 0c48f54..b690c44 100644 (file)
--- a/ext/gtk/gstgtkbasesink.c
+++ b/ext/gtk/gstgtkbasesink.c
@@ -283,6 +283,19 @@ gst_gtk_base_sink_navigation_send_event (GstNavigation * navigation,
   GstGtkBaseSink *sink = GST_GTK_BASE_SINK (navigation);
   GstEvent *event;
   GstPad *pad;
+  gdouble x, y;
+
+  if (gst_structure_get_double (structure, "pointer_x", &x) &&
+      gst_structure_get_double (structure, "pointer_y", &y)) {
+    GtkGstBaseWidget *widget = gst_gtk_base_sink_get_widget (sink);
+    gdouble stream_x, stream_y;
+
+    gtk_gst_base_widget_display_size_to_stream_size (widget,
+        x, y, &stream_x, &stream_y);
+    gst_structure_set (structure,
+        "pointer_x", G_TYPE_DOUBLE, (gdouble) stream_x,
+        "pointer_y", G_TYPE_DOUBLE, (gdouble) stream_y, NULL);
+  }
 
   event = gst_event_new_navigation (structure);
   pad = gst_pad_get_peer (GST_VIDEO_SINK_PAD (sink));