Capturing the visible framebuffer

canonical · Oct 17, 2023 · 6e1de44 · 6e1de44
1 parent e32d07e
commit 6e1de44
Showing 1 changed file with 7 additions and 2 deletions.
diff --git a/src/platforms/eglstream-kms/server/display.cpp b/src/platforms/eglstream-kms/server/display.cpp
@@ -213,11 +213,15 @@ class DisplayBuffer
 
         if (next_swap) // This is the KMS route
         {
-            visible_fb = std::move(next_swap);
+            visible_fb = std::move(scheduled_fb);
+            scheduled_fb = nullptr;
+
+            scheduled_fb = std::move(next_swap);
             next_swap = nullptr;
             auto const predicted_render_time = 50ms; // Predicted worst case render time for the next frame...
 
-            output->queue_atomic_flip(*visible_fb, event_handler->drm_event_data());
+            output->queue_atomic_flip(*scheduled_fb, event_handler->drm_event_data());
+
             auto const min_frame_interval = 1000ms / output->max_refresh_rate();
             if (predicted_render_time < min_frame_interval)
                 recommend_sleep = min_frame_interval - predicted_render_time;
@@ -337,6 +341,7 @@ class DisplayBuffer
 
     /// Used only for the KMS case
     std::shared_ptr<mg::FBHandle const> next_swap{nullptr};
+    std::shared_ptr<mg::FBHandle const> scheduled_fb{nullptr};
     std::shared_ptr<mg::FBHandle const> visible_fb{nullptr};
     std::chrono::milliseconds recommend_sleep{0};
 };