Cache ObjectHelper instances

Task-number: QTRD-2792
Change-Id: I90d83bd9b73a0f337fd26f1b92000e72b3ec0607
Reviewed-by: Tomi Korpipää <tomi.korpipaa@digia.com>

16 files changed, 148 insertions, 96 deletions

diff --git a/src/datavisualization/data/customrenderitem.cpp b/src/datavisualization/data/customrenderitem.cpp
index 53db9bd1..a1c70057 100644
--- a/src/datavisualization/data/customrenderitem.cpp
+++ b/src/datavisualization/data/customrenderitem.cpp
@@ -24,29 +24,19 @@ CustomRenderItem::CustomRenderItem()
     : AbstractRenderItem(),
       m_texture(0),
       m_object(0),
-      m_visible(true)
+      m_visible(true),
+      m_renderer(0)
 {
 }
 
-CustomRenderItem::CustomRenderItem(const CustomRenderItem &other)
-    : AbstractRenderItem(other)
-{
-    m_texture = other.m_texture;
-}
-
 CustomRenderItem::~CustomRenderItem()
 {
-    if (m_object)
-        delete m_object;
+    ObjectHelper::releaseObjectHelper(m_renderer, m_object);
 }
 
 void CustomRenderItem::setMesh(const QString &meshFile)
 {
-    if (m_object)
-        delete m_object;
-    // Load mesh and make an object of it
-    m_object = new ObjectHelper(meshFile);
-    m_object->load();
+    ObjectHelper::resetObjectHelper(m_renderer, m_object, meshFile);
 }
 
 QT_END_NAMESPACE_DATAVISUALIZATION
diff --git a/src/datavisualization/data/customrenderitem_p.h b/src/datavisualization/data/customrenderitem_p.h
index f05540d0..17195f7b 100644
--- a/src/datavisualization/data/customrenderitem_p.h
+++ b/src/datavisualization/data/customrenderitem_p.h
@@ -35,12 +35,12 @@
 QT_BEGIN_NAMESPACE_DATAVISUALIZATION
 
 class QCustom3DItem;
+class Abstract3DRenderer;
 
 class CustomRenderItem : public AbstractRenderItem
 {
 public:
     CustomRenderItem();
-    CustomRenderItem(const CustomRenderItem &other);
     virtual ~CustomRenderItem();
 
     inline void setTexture(GLuint texture) { m_texture = texture; }
@@ -65,19 +65,24 @@ public:
     inline int index() const { return m_index; }
     inline void setShadowCasting(bool shadowCasting) { m_shadowCasting = shadowCasting; }
     inline bool isShadowCasting() const { return m_shadowCasting; }
+    inline void setRenderer(Abstract3DRenderer *renderer) { m_renderer = renderer; }
 
 private:
+    Q_DISABLE_COPY(CustomRenderItem)
+
     GLuint m_texture;
     QVector3D m_scaling;
     QVector3D m_position;
     bool m_absolute;
-    ObjectHelper *m_object;
+    ObjectHelper *m_object; // shared reference
     bool m_needBlend;
     bool m_visible;
     bool m_valid;
     int m_index;
     bool m_shadowCasting;
     QCustom3DItem *m_item;
+    Abstract3DRenderer *m_renderer;
+
  };
 typedef QHash<QCustom3DItem *, CustomRenderItem *> CustomRenderItemArray;
 
diff --git a/src/datavisualization/engine/abstract3drenderer.cpp b/src/datavisualization/engine/abstract3drenderer.cpp
index 988ea21e..8c2e9578 100644
--- a/src/datavisualization/engine/abstract3drenderer.cpp
+++ b/src/datavisualization/engine/abstract3drenderer.cpp
@@ -570,6 +570,7 @@ QVector4D Abstract3DRenderer::indexToSelectionColor(GLint index)
 CustomRenderItem *Abstract3DRenderer::addCustomItem(QCustom3DItem *item)
 {
     CustomRenderItem *newItem = new CustomRenderItem();
+    newItem->setRenderer(this);
     newItem->setItemPointer(item); // Store pointer for render item updates
     newItem->setMesh(item->meshFile());
     newItem->setScaling(item->scaling());
diff --git a/src/datavisualization/engine/bars3drenderer.cpp b/src/datavisualization/engine/bars3drenderer.cpp
index 4dcf296f..ec13525b 100644
--- a/src/datavisualization/engine/bars3drenderer.cpp
+++ b/src/datavisualization/engine/bars3drenderer.cpp
@@ -120,9 +120,9 @@ Bars3DRenderer::~Bars3DRenderer()
     delete m_depthShader;
     delete m_selectionShader;
     delete m_backgroundShader;
-    delete m_backgroundObj;
-    delete m_gridLineObj;
-    delete m_labelObj;
+    ObjectHelper::releaseObjectHelper(this, m_backgroundObj);
+    ObjectHelper::releaseObjectHelper(this, m_gridLineObj);
+    ObjectHelper::releaseObjectHelper(this, m_labelObj);
     delete m_labelShader;
 }
 
@@ -2336,26 +2336,20 @@ void Bars3DRenderer::updateShadowQuality(QAbstract3DGraph::ShadowQuality quality
 
 void Bars3DRenderer::loadBackgroundMesh()
 {
-    if (m_backgroundObj)
-        delete m_backgroundObj;
-    m_backgroundObj = new ObjectHelper(QStringLiteral(":/defaultMeshes/negativeBackground"));
-    m_backgroundObj->load();
+    ObjectHelper::resetObjectHelper(this, m_backgroundObj,
+                                    QStringLiteral(":/defaultMeshes/negativeBackground"));
 }
 
 void Bars3DRenderer::loadGridLineMesh()
 {
-    if (m_gridLineObj)
-        delete m_gridLineObj;
-    m_gridLineObj = new ObjectHelper(QStringLiteral(":/defaultMeshes/plane"));
-    m_gridLineObj->load();
+    ObjectHelper::resetObjectHelper(this, m_gridLineObj,
+                                    QStringLiteral(":/defaultMeshes/plane"));
 }
 
 void Bars3DRenderer::loadLabelMesh()
 {
-    if (m_labelObj)
-        delete m_labelObj;
-    m_labelObj = new ObjectHelper(QStringLiteral(":/defaultMeshes/plane"));
-    m_labelObj->load();
+    ObjectHelper::resetObjectHelper(this, m_labelObj,
+                                    QStringLiteral(":/defaultMeshes/plane"));
 }
 
 void Bars3DRenderer::updateTextures()
diff --git a/src/datavisualization/engine/bars3drenderer_p.h b/src/datavisualization/engine/bars3drenderer_p.h
index 2e9ec0de..d62171eb 100644
--- a/src/datavisualization/engine/bars3drenderer_p.h
+++ b/src/datavisualization/engine/bars3drenderer_p.h
@@ -73,9 +73,9 @@ private:
     ShaderHelper *m_selectionShader;
     ShaderHelper *m_backgroundShader;
     ShaderHelper *m_labelShader;
-    ObjectHelper *m_backgroundObj;
-    ObjectHelper *m_gridLineObj;
-    ObjectHelper *m_labelObj;
+    ObjectHelper *m_backgroundObj; // Shared reference
+    ObjectHelper *m_gridLineObj; // Shared reference
+    ObjectHelper *m_labelObj; // Shared reference
     GLuint m_bgrTexture;
     GLuint m_depthTexture;
     GLuint m_selectionTexture;
diff --git a/src/datavisualization/engine/scatter3drenderer.cpp b/src/datavisualization/engine/scatter3drenderer.cpp
index acdd3cb8..3c1adfa0 100644
--- a/src/datavisualization/engine/scatter3drenderer.cpp
+++ b/src/datavisualization/engine/scatter3drenderer.cpp
@@ -118,11 +118,11 @@ Scatter3DRenderer::~Scatter3DRenderer()
     delete m_selectionShader;
     delete m_backgroundShader;
     delete m_labelShader;
-    delete m_backgroundObj;
+    ObjectHelper::releaseObjectHelper(this, m_backgroundObj);
 #if !defined(QT_OPENGL_ES_2)
-    delete m_gridLineObj;
+    ObjectHelper::releaseObjectHelper(this, m_gridLineObj);
 #endif
-    delete m_labelObj;
+    ObjectHelper::releaseObjectHelper(this, m_labelObj);
 }
 
 void Scatter3DRenderer::initializeOpenGL()
@@ -1731,28 +1731,22 @@ void Scatter3DRenderer::updateShadowQuality(QAbstract3DGraph::ShadowQuality qual
 
 void Scatter3DRenderer::loadBackgroundMesh()
 {
-    if (m_backgroundObj)
-        delete m_backgroundObj;
-    m_backgroundObj = new ObjectHelper(QStringLiteral(":/defaultMeshes/background"));
-    m_backgroundObj->load();
+    ObjectHelper::resetObjectHelper(this, m_backgroundObj,
+                                    QStringLiteral(":/defaultMeshes/background"));
 }
 
 #if !(defined QT_OPENGL_ES_2)
 void Scatter3DRenderer::loadGridLineMesh()
 {
-    if (m_gridLineObj)
-        delete m_gridLineObj;
-    m_gridLineObj = new ObjectHelper(QStringLiteral(":/defaultMeshes/plane"));
-    m_gridLineObj->load();
+    ObjectHelper::resetObjectHelper(this, m_gridLineObj,
+                                    QStringLiteral(":/defaultMeshes/plane"));
 }
 #endif
 
 void Scatter3DRenderer::loadLabelMesh()
 {
-    if (m_labelObj)
-        delete m_labelObj;
-    m_labelObj = new ObjectHelper(QStringLiteral(":/defaultMeshes/plane"));
-    m_labelObj->load();
+    ObjectHelper::resetObjectHelper(this, m_labelObj,
+                                    QStringLiteral(":/defaultMeshes/plane"));
 }
 
 void Scatter3DRenderer::updateTextures()
diff --git a/src/datavisualization/engine/scatter3drenderer_p.h b/src/datavisualization/engine/scatter3drenderer_p.h
index 0b58102b..b6a110ff 100644
--- a/src/datavisualization/engine/scatter3drenderer_p.h
+++ b/src/datavisualization/engine/scatter3drenderer_p.h
@@ -68,11 +68,11 @@ private:
     ShaderHelper *m_selectionShader;
     ShaderHelper *m_backgroundShader;
     ShaderHelper *m_labelShader;
-    ObjectHelper *m_backgroundObj;
+    ObjectHelper *m_backgroundObj; // Shared reference
 #if !(defined QT_OPENGL_ES_2)
-    ObjectHelper *m_gridLineObj;
+    ObjectHelper *m_gridLineObj; // Shared reference
 #endif
-    ObjectHelper *m_labelObj;
+    ObjectHelper *m_labelObj; // Shared reference
     GLuint m_bgrTexture;
     GLuint m_depthTexture;
     GLuint m_selectionTexture;
diff --git a/src/datavisualization/engine/selectionpointer.cpp b/src/datavisualization/engine/selectionpointer.cpp
index 646212f0..fe9325cf 100644
--- a/src/datavisualization/engine/selectionpointer.cpp
+++ b/src/datavisualization/engine/selectionpointer.cpp
@@ -54,7 +54,6 @@ SelectionPointer::~SelectionPointer()
 {
     delete m_labelShader;
     delete m_pointShader;
-    delete m_labelObj;
     delete m_textureHelper;
 }
 
@@ -66,7 +65,6 @@ void SelectionPointer::initializeOpenGL()
     m_drawer->initializeOpenGL();
 
     initShaders();
-    loadLabelMesh();
 }
 
 void SelectionPointer::updateScene(Q3DScene *scene)
@@ -235,6 +233,11 @@ void SelectionPointer::setPointerObject(ObjectHelper *object)
     m_pointObj = object;
 }
 
+void SelectionPointer::setLabelObject(ObjectHelper *object)
+{
+    m_labelObj = object;
+}
+
 void SelectionPointer::handleDrawerChange()
 {
     m_cachedTheme = m_drawer->theme();
@@ -269,12 +272,4 @@ void SelectionPointer::initShaders()
 
 }
 
-void SelectionPointer::loadLabelMesh()
-{
-    if (m_labelObj)
-        delete m_labelObj;
-    m_labelObj = new ObjectHelper(QStringLiteral(":/defaultMeshes/plane"));
-    m_labelObj->load();
-}
-
 QT_END_NAMESPACE_DATAVISUALIZATION
diff --git a/src/datavisualization/engine/selectionpointer_p.h b/src/datavisualization/engine/selectionpointer_p.h
index 03e09cca..f33cd6cd 100644
--- a/src/datavisualization/engine/selectionpointer_p.h
+++ b/src/datavisualization/engine/selectionpointer_p.h
@@ -53,6 +53,7 @@ public:
     void setPosition(const QVector3D &position);
     void setLabel(const QString &label);
     void setPointerObject(ObjectHelper *object);
+    void setLabelObject(ObjectHelper *object);
     void handleDrawerChange();
     void updateBoundingRect(const QRect &rect);
     void updateScene(Q3DScene *scene);
@@ -63,12 +64,11 @@ public:
 private:
     void initializeOpenGL();
     void initShaders();
-    void loadLabelMesh();
 
 private:
     ShaderHelper *m_labelShader;
     ShaderHelper *m_pointShader;
-    ObjectHelper *m_labelObj;
+    ObjectHelper *m_labelObj; // Not owned
     ObjectHelper *m_pointObj; // Not owned
     TextureHelper *m_textureHelper;
     Q3DTheme *m_cachedTheme;
diff --git a/src/datavisualization/engine/seriesrendercache.cpp b/src/datavisualization/engine/seriesrendercache.cpp
index e674ae43..e4f221f8 100644
--- a/src/datavisualization/engine/seriesrendercache.cpp
+++ b/src/datavisualization/engine/seriesrendercache.cpp
@@ -109,13 +109,7 @@ void SeriesRenderCache::populate(bool newSeries)
             m_renderer->fixMeshFileName(meshFileName, m_mesh);
         }
 
-        delete m_object;
-        if (meshFileName.isEmpty()) {
-            m_object = 0;
-        } else {
-            m_object = new ObjectHelper(meshFileName);
-            m_object->load();
-        }
+        ObjectHelper::resetObjectHelper(m_renderer, m_object, meshFileName);
     }
 
     if (newSeries || changeTracker.meshRotationChanged) {
@@ -193,7 +187,7 @@ void SeriesRenderCache::populate(bool newSeries)
 
 void SeriesRenderCache::cleanup(TextureHelper *texHelper)
 {
-    delete m_object;
+    ObjectHelper::releaseObjectHelper(m_renderer, m_object);
     if (QOpenGLContext::currentContext()) {
         texHelper->deleteTexture(&m_baseUniformTexture);
         texHelper->deleteTexture(&m_baseGradientTexture);
diff --git a/src/datavisualization/engine/seriesrendercache_p.h b/src/datavisualization/engine/seriesrendercache_p.h
index 3cd94487..96b61b87 100644
--- a/src/datavisualization/engine/seriesrendercache_p.h
+++ b/src/datavisualization/engine/seriesrendercache_p.h
@@ -74,7 +74,7 @@ public:
 
 protected:
     QAbstract3DSeries *m_series;
-    ObjectHelper *m_object;
+    ObjectHelper *m_object; // Shared reference
     QAbstract3DSeries::Mesh m_mesh;
     QQuaternion m_meshRotation;
 
diff --git a/src/datavisualization/engine/surface3drenderer.cpp b/src/datavisualization/engine/surface3drenderer.cpp
index 4b5464d5..1f3a6932 100644
--- a/src/datavisualization/engine/surface3drenderer.cpp
+++ b/src/datavisualization/engine/surface3drenderer.cpp
@@ -142,11 +142,11 @@ Surface3DRenderer::~Surface3DRenderer()
     delete m_surfaceSliceSmoothShader;
     delete m_labelShader;
 
-    delete m_backgroundObj;
+    ObjectHelper::releaseObjectHelper(this, m_backgroundObj);
 #if !defined(QT_OPENGL_ES_2)
-    delete m_gridLineObj;
+    ObjectHelper::releaseObjectHelper(this, m_gridLineObj);
 #endif
-    delete m_labelObj;
+    ObjectHelper::releaseObjectHelper(this, m_labelObj);
 }
 
 void Surface3DRenderer::initializeOpenGL()
@@ -2311,19 +2311,15 @@ void Surface3DRenderer::resetClickedStatus()
 
 void Surface3DRenderer::loadBackgroundMesh()
 {
-    if (m_backgroundObj)
-        delete m_backgroundObj;
-    m_backgroundObj = new ObjectHelper(QStringLiteral(":/defaultMeshes/background"));
-    m_backgroundObj->load();
+    ObjectHelper::resetObjectHelper(this, m_backgroundObj,
+                                    QStringLiteral(":/defaultMeshes/background"));
 }
 
 #if !(defined QT_OPENGL_ES_2)
 void Surface3DRenderer::loadGridLineMesh()
 {
-    if (m_gridLineObj)
-        delete m_gridLineObj;
-    m_gridLineObj = new ObjectHelper(QStringLiteral(":/defaultMeshes/plane"));
-    m_gridLineObj->load();
+    ObjectHelper::resetObjectHelper(this, m_gridLineObj,
+                                    QStringLiteral(":/defaultMeshes/plane"));
 }
 #endif
 
@@ -2407,6 +2403,7 @@ void Surface3DRenderer::updateSelectionPoint(SurfaceSeriesRenderCache *cache, co
         slicePointer->setPosition((subPosFront + subPosBack) / 2.0f);
         slicePointer->setLabel(selectionLabel);
         slicePointer->setPointerObject(cache->object());
+        slicePointer->setLabelObject(m_labelObj);
         slicePointer->setHighlightColor(cache->singleHighlightColor());
         slicePointer->updateScene(m_cachedScene);
         slicePointer->setRotation(cache->meshRotation());
@@ -2420,6 +2417,7 @@ void Surface3DRenderer::updateSelectionPoint(SurfaceSeriesRenderCache *cache, co
     mainPointer->setPosition(mainPos);
     mainPointer->setLabel(selectionLabel);
     mainPointer->setPointerObject(cache->object());
+    mainPointer->setLabelObject(m_labelObj);
     mainPointer->setHighlightColor(cache->singleHighlightColor());
     mainPointer->updateScene(m_cachedScene);
     mainPointer->setRotation(cache->meshRotation());
@@ -2548,10 +2546,8 @@ void Surface3DRenderer::updateSlicingActive(bool isSlicing)
 
 void Surface3DRenderer::loadLabelMesh()
 {
-    if (m_labelObj)
-        delete m_labelObj;
-    m_labelObj = new ObjectHelper(QStringLiteral(":/defaultMeshes/plane"));
-    m_labelObj->load();
+    ObjectHelper::resetObjectHelper(this, m_labelObj,
+                                    QStringLiteral(":/defaultMeshes/plane"));
 }
 
 void Surface3DRenderer::initShaders(const QString &vertexShader, const QString &fragmentShader)
diff --git a/src/datavisualization/engine/surface3drenderer_p.h b/src/datavisualization/engine/surface3drenderer_p.h
index 7c3e461d..e6c66a90 100644
--- a/src/datavisualization/engine/surface3drenderer_p.h
+++ b/src/datavisualization/engine/surface3drenderer_p.h
@@ -73,11 +73,11 @@ private:
     GLfloat m_maxVisibleRowValue;
     GLfloat m_visibleColumnRange;
     GLfloat m_visibleRowRange;
-    ObjectHelper *m_backgroundObj;
+    ObjectHelper *m_backgroundObj; // Shared reference
 #if !(defined QT_OPENGL_ES_2)
-    ObjectHelper *m_gridLineObj;
+    ObjectHelper *m_gridLineObj; // Shared reference
 #endif
-    ObjectHelper *m_labelObj;
+    ObjectHelper *m_labelObj; // Shared reference
     GLuint m_depthTexture;
     GLuint m_depthModelTexture;
     GLuint m_depthFrameBuffer;
diff --git a/src/datavisualization/utils/objecthelper.cpp b/src/datavisualization/utils/objecthelper.cpp
index 97695193..8cbf2aa2 100644
--- a/src/datavisualization/utils/objecthelper.cpp
+++ b/src/datavisualization/utils/objecthelper.cpp
@@ -27,15 +27,87 @@ ObjectHelper::ObjectHelper(const QString &objectFile)
     : m_objectFile(objectFile)
 {
     m_indicesType = GL_UNSIGNED_SHORT;
+    load();
 }
 
+struct ObjectHelperRef {
+    int refCount;
+    ObjectHelper *obj;
+};
+
+// The "Abstract3DRenderer *" key identifies the renderer
+static QHash<const Abstract3DRenderer *, QHash<QString, ObjectHelperRef *> *> cacheTable;
+
 ObjectHelper::~ObjectHelper()
 {
 }
 
-void ObjectHelper::setObjectFile(const QString &objectFile)
+void ObjectHelper::resetObjectHelper(const Abstract3DRenderer *cacheId, ObjectHelper *&obj,
+                                     const QString &meshFile)
+{
+    Q_ASSERT(cacheId);
+
+    if (obj) {
+        const QString &oldFile = obj->objectFile();
+        if (meshFile == oldFile)
+            return; // same file, do nothing
+        releaseObjectHelper(cacheId, obj);
+    }
+    obj = getObjectHelper(cacheId, meshFile);
+}
+
+void ObjectHelper::releaseObjectHelper(const Abstract3DRenderer *cacheId, ObjectHelper *&obj)
+{
+    Q_ASSERT(cacheId);
+
+    if (obj) {
+        QHash<QString, ObjectHelperRef *> *objectTable = cacheTable.value(cacheId, 0);
+        if (objectTable) {
+            // Delete object if last reference is released
+            ObjectHelperRef *objRef = objectTable->value(obj->m_objectFile, 0);
+            if (objRef) {
+                objRef->refCount--;
+                if (objRef->refCount <= 0) {
+                    objectTable->remove(obj->m_objectFile);
+                    delete objRef->obj;
+                    delete objRef;
+                }
+            }
+            if (objectTable->isEmpty()) {
+                // Remove the entire cache if last object was removed
+                cacheTable.remove(cacheId);
+                delete objectTable;
+            }
+        } else {
+            // Just delete the object if unknown cache
+            delete obj;
+        }
+        obj = 0;
+    }
+}
+
+ObjectHelper *ObjectHelper::getObjectHelper(const Abstract3DRenderer *cacheId,
+                                            const QString &objectFile)
 {
-    m_objectFile = objectFile;
+    if (objectFile.isEmpty())
+        return 0;
+
+    QHash<QString, ObjectHelperRef *> *objectTable = cacheTable.value(cacheId, 0);
+    if (!objectTable) {
+        objectTable = new QHash<QString, ObjectHelperRef *>;
+        cacheTable.insert(cacheId, objectTable);
+    }
+
+    // Check if object helper for this mesh already exists
+    ObjectHelperRef *objRef = objectTable->value(objectFile, 0);
+    if (!objRef) {
+        objRef = new ObjectHelperRef;
+        objRef->refCount = 0;
+        objRef->obj = new ObjectHelper(objectFile);
+        objectTable->insert(objectFile, objRef);
+    }
+    objRef->refCount++;
+    return objRef->obj;
 }
 
 void ObjectHelper::load()
diff --git a/src/datavisualization/utils/objecthelper_p.h b/src/datavisualization/utils/objecthelper_p.h
index 0260dd05..93dc6c94 100644
--- a/src/datavisualization/utils/objecthelper_p.h
+++ b/src/datavisualization/utils/objecthelper_p.h
@@ -35,17 +35,26 @@
 
 QT_BEGIN_NAMESPACE_DATAVISUALIZATION
 
+class Abstract3DRenderer;
+
 class ObjectHelper : public AbstractObjectHelper
 {
+private:
+    ObjectHelper(const QString &objectFile);
 public:
-    ObjectHelper(const QString &objectFile = QString());
     ~ObjectHelper();
 
-    void setObjectFile(const QString &objectFile);
+    static void resetObjectHelper(const Abstract3DRenderer *cacheId, ObjectHelper *&obj,
+                                  const QString &meshFile);
+    static void releaseObjectHelper(const Abstract3DRenderer *cacheId, ObjectHelper *&obj);
 
-    void load();
+    inline const QString &objectFile() { return m_objectFile; }
 
 private:
+    static ObjectHelper *getObjectHelper(const Abstract3DRenderer *cacheId,
+                                         const QString &objectFile);
+    void load();
+
     QString m_objectFile;
 };
 
diff --git a/tests/multigraphs/data.cpp b/tests/multigraphs/data.cpp
index dc736d46..c1e7b409 100644
--- a/tests/multigraphs/data.cpp
+++ b/tests/multigraphs/data.cpp
@@ -268,6 +268,8 @@ void Data::changeMode(int mode)
 void Data::start()
 {
     m_started = true;
+    // Reset resolution before starting (otherwise restart will crash due to empty data)
+    setResolution(m_resolutionLevel);
     updateData();
     m_statusArea->append(QStringLiteral("<b>Started<\b>"));
 }