From 4a879379b3e3d177754298cae45b5058d71fa6d1 Mon Sep 17 00:00:00 2001
From: Vlad Zahorodnii <vlad.zahorodnii@kde.org>
Date: Sat, 28 Nov 2020 22:01:45 +0200
Subject: [PATCH] scene: Schedule a repaint only if the output is affected by
 workspace repaint

If an output is not affected by a workspace repaint, then we don't have
to schedule a repaint on that output. This improves the overall performance.
---
 scene.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/scene.cpp b/scene.cpp
index 8c1f91804c..695e5af7a1 100644
--- a/scene.cpp
+++ b/scene.cpp
@@ -66,6 +66,7 @@
 #include "deleted.h"
 #include "effects.h"
 #include "overlaywindow.h"
+#include "renderloop.h"
 #include "screens.h"
 #include "shadow.h"
 #include "subsurfacemonitor.h"
@@ -109,13 +110,13 @@ void Scene::addRepaint(const QRegion &region)
             const QRegion dirtyRegion = region & output->geometry();
             if (!dirtyRegion.isEmpty()) {
                 m_repaints[screenId] += dirtyRegion;
+                output->renderLoop()->scheduleRepaint();
             }
         }
     } else {
         m_repaints[0] += region;
+        kwinApp()->platform()->renderLoop()->scheduleRepaint();
     }
-
-    Compositor::self()->scheduleRepaint();
 }
 
 QRegion Scene::repaints(int screenId) const