From 126f69936cad13e96cddb3480a1ed061ab5e3a1c Mon Sep 17 00:00:00 2001
From: wheaney <42350981+wheaney@users.noreply.github.com>
Date: Thu, 17 Jul 2025 14:22:31 -0700
Subject: [PATCH] Shared mem file monitoring

---
 kwin/src/breezydesktopeffect.cpp | 10 ++++++----
 kwin/src/breezydesktopeffect.h   |  3 ++-
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/kwin/src/breezydesktopeffect.cpp b/kwin/src/breezydesktopeffect.cpp
index 5568547..f56afa1 100644
--- a/kwin/src/breezydesktopeffect.cpp
+++ b/kwin/src/breezydesktopeffect.cpp
@@ -7,6 +7,7 @@
 
 #include <QAction>
 #include <QFile>
+#include <QFileSystemWatcher>
 #include <QLoggingCategory>
 #include <QQuickItem>
 #include <QTimer>
@@ -53,10 +54,11 @@ BreezyDesktopEffect::BreezyDesktopEffect()
 
     setSource(QUrl::fromLocalFile(QStandardPaths::locate(QStandardPaths::GenericDataLocation, QStringLiteral("kwin/effects/breezy_desktop/qml/main.qml"))));
 
-    m_xrRotationTimer = new QTimer(this);
-    m_xrRotationTimer->setInterval(16); // ~60Hz
-    connect(m_xrRotationTimer, &QTimer::timeout, this, &BreezyDesktopEffect::updateXrRotation);
-    m_xrRotationTimer->start();
+    // Monitor the IMU file for changes
+    const QString shmPath = QStringLiteral("/dev/shm/breezy_desktop_imu");
+    m_xrRotationFileWatcher = new QFileSystemWatcher(this);
+    m_xrRotationFileWatcher->addPath(shmPath);
+    connect(m_xrRotationFileWatcher, &QFileSystemWatcher::fileChanged, this, &BreezyDesktopEffect::updateXrRotation);
 
     m_cursorUpdateTimer = new QTimer(this);
     connect(m_cursorUpdateTimer, &QTimer::timeout, this, &BreezyDesktopEffect::updateCursorPos);
diff --git a/kwin/src/breezydesktopeffect.h b/kwin/src/breezydesktopeffect.h
index 3f56426..e357876 100644
--- a/kwin/src/breezydesktopeffect.h
+++ b/kwin/src/breezydesktopeffect.h
@@ -3,6 +3,7 @@
 #include <effect/quickeffect.h>
 
 #include <QAction>
+#include <QFileSystemWatcher>
 #include <QImage>
 #include <QKeySequence>
 #include <QQuaternion>
@@ -86,7 +87,7 @@ namespace KWin
         bool m_isMouseHidden = false;
 
         QQuaternion m_xrRotation;
-        QTimer *m_xrRotationTimer = nullptr;
+        QFileSystemWatcher *m_xrRotationFileWatcher = nullptr;
         QPointF m_cursorPos;
         QTimer *m_cursorUpdateTimer = nullptr;
     };