backend: Port to gtkglsink

Replace the clutter-gtk based video widget with a native GL GStreamer
widget, "gtkglsink".

- Display aspect-ratio support for non-square pixels was removed. While
  it still worked correctly (you can try setting your display's resolution
  to a different aspect ratio), things like text and icons, and everything
  else in every application and the shell chrome would have been looked
  broken, including the video player. Except the video in the video player.
- Video aspect ratio, pillar-boxing, letter-boxing and automatic rotation
  is now handled in the GStreamer widget
- The placeholder logos, when playing files with unsupported video, or
  no video tracks have been changed.
- Handling of mouse events has been simplified

Some functionality could not be brought forward at this time:
- Crop-zooming (available using the R/T keys) isn't implemented yet
- Gestures support, which never worked properly anyway, wasn't
  reimplemented

1 files changed, 0 insertions, 1 deletions

diff --git a/meson.build b/meson.build
index f6e7a3cfe..b13b1cfa2 100644
--- a/meson.build
+++ b/meson.build
@@ -152,7 +152,6 @@ gst_pbutils_dep = dependency('gstreamer-pbutils-1.0')
 peas_dep = dependency('libpeas-1.0', version: peas_req_version)
 peas_gtk_dep = dependency('libpeas-gtk-1.0', version: peas_req_version)
 totem_plparser_dep = dependency('totem-plparser', version: totem_plparser_req_version)
-clutter_gtk_dep = dependency('clutter-gtk-1.0', version: '>= 1.8.1')
 m_dep = cc.find_library('m', required: true)
 
 libgd = subproject(