From 658fe9da7eb00a1f830e606dae8894578de53c72 Mon Sep 17 00:00:00 2001
From: itsmattkc <34096995+itsmattkc@users.noreply.github.com>
Date: Fri, 23 Sep 2022 17:54:46 -0700
Subject: [PATCH] playbackcache: keep track of cache file time to prevent
 unnecessary loads

---
 app/render/playbackcache.cpp | 11 +++++++++--
 app/render/playbackcache.h   |  2 ++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/app/render/playbackcache.cpp b/app/render/playbackcache.cpp
index 0f179dab8..487eac2de 100644
--- a/app/render/playbackcache.cpp
+++ b/app/render/playbackcache.cpp
@@ -68,7 +68,9 @@ void PlaybackCache::LoadState()
 {
   QDir cache_dir = GetThisCacheDirectory();
   QFile f(cache_dir.filePath(QStringLiteral("state")));
-  if (f.open(QFile::ReadOnly)) {
+
+  qint64 file_time = f.fileTime(QFileDevice::FileModificationTime).toMSecsSinceEpoch();
+  if (file_time > last_loaded_state_ && f.open(QFile::ReadOnly)) {
     QDataStream s(&f);
 
     uint32_t version;
@@ -116,6 +118,8 @@ void PlaybackCache::LoadState()
     }
 
     f.close();
+
+    last_loaded_state_ = file_time;
   }
 }
 
@@ -161,6 +165,8 @@ void PlaybackCache::SaveState()
         }
 
         f.close();
+
+        last_loaded_state_ = f.fileTime(QFileDevice::FileModificationTime).toMSecsSinceEpoch();
       }
     }
   }
@@ -236,7 +242,8 @@ Project *PlaybackCache::GetProject() const
 
 PlaybackCache::PlaybackCache(QObject *parent) :
   QObject(parent),
-  saving_enabled_(true)
+  saving_enabled_(true),
+  last_loaded_state_(0)
 {
   uuid_ = QUuid::createUuid();
 }
diff --git a/app/render/playbackcache.h b/app/render/playbackcache.h
index d96709355..3485fdcb4 100644
--- a/app/render/playbackcache.h
+++ b/app/render/playbackcache.h
@@ -132,6 +132,8 @@ private:
 
   QVector<Passthrough> passthroughs_;
 
+  qint64 last_loaded_state_;
+
 };
 
 }