all: implement output transforms

src/compositor.rs

@@ -204,6 +204,7 @@ fn start_compositor2(
         dma_buf_ids: Default::default(),
         drm_feedback_ids: Default::default(),
         direct_scanout_enabled: Cell::new(true),
+        output_transforms: Default::default(),
     });
     state.tracker.register(ClientId::from_raw(0));
     create_dummy_output(&state);