ProjectLoader: Add renderFps property

Author: adazem009

src/projectloader.cpp

@@ -35,6 +35,7 @@ ProjectLoader::ProjectLoader(QObject *parent) :
     connect(qApp, &QCoreApplication::aboutToQuit, this, &ProjectLoader::clear);
 
     initTimer();
+    m_renderTimer.start();
 
     // Register pen blocks
     ScratchConfiguration::registerExtension(std::make_shared<PenBlocks>());
@@ -97,6 +98,11 @@ bool ProjectLoader::running() const
     return m_running;
 }
 
+int ProjectLoader::renderFps() const
+{
+    return m_renderFps;
+}
+
 IEngine *ProjectLoader::engine() const
 {
     if (m_loadThread.isRunning())
@@ -202,6 +208,15 @@ void ProjectLoader::timerEvent(QTimerEvent *event)
             m_running = !m_running;
             emit runningChanged();
         }
+
+        // FPS counter
+        if (m_renderTimer.elapsed() >= 1000) {
+            m_renderFps = m_renderFpsCounter;
+            m_renderFpsCounter = 0;
+            emit renderFpsChanged();
+            m_renderTimer.restart();
+        } else
+            m_renderFpsCounter++;
     }
 
     event->accept();

src/projectloader.h

@@ -25,6 +25,7 @@ class ProjectLoader : public QObject
         Q_PROPERTY(QString fileName READ fileName WRITE setFileName NOTIFY fileNameChanged)
         Q_PROPERTY(bool loadStatus READ loadStatus NOTIFY loadStatusChanged)
         Q_PROPERTY(bool running READ running NOTIFY runningChanged)
+        Q_PROPERTY(int renderFps READ renderFps NOTIFY renderFpsChanged FINAL)
         Q_PROPERTY(libscratchcpp::IEngine *engine READ engine NOTIFY engineChanged)
         Q_PROPERTY(StageModel *stage READ stage NOTIFY stageChanged)
         Q_PROPERTY(QQmlListProperty<SpriteModel> sprites READ sprites NOTIFY spritesChanged)
@@ -98,11 +99,14 @@ class ProjectLoader : public QObject
 
         unsigned int assetCount() const;
 
+        int renderFps() const;
+
     signals:
         void fileNameChanged();
         void loadStatusChanged();
         void loadingFinished();
         void runningChanged();
+        void renderFpsChanged();
         void engineChanged();
         void stageChanged();
         void spritesChanged();
@@ -145,6 +149,9 @@ class ProjectLoader : public QObject
         QFuture<void> m_loadThread;
         libscratchcpp::Project m_project;
         bool m_running = false;
+        QElapsedTimer m_renderTimer;
+        int m_renderFps = 0;
+        int m_renderFpsCounter = 0;
         libscratchcpp::IEngine *m_engine = nullptr;
         libscratchcpp::IEngine *m_oldEngine = nullptr;
         QMutex m_engineMutex;