feat: improve image viewer render performance

src/src/Rendering/Viewer/DICOMImageViewer.cxx

@@ -466,7 +466,7 @@ void DICOMImageViewer::SetSlice(int slice) {
     if (Fusion && FusionMapper) {
         FusionMapper->SetClippingPlanes(ImageMapper->GetClippingPlanes());
     }
-    this->Render();
+    // this->Render();
     UpdateTopLeftCornerInfo();
     if (InteractorStyle){
         double direction = (double)(slice - lastSliceNumber);
@@ -1186,7 +1186,6 @@ void DICOMImageViewer::UpdateCornerInfo(int index) {
             cornerAnnotation->SetText(index, m_cornerInfo.ConstAnno[index].c_str());
         }
     }
-    this->Render();
 }
 
 void DICOMImageViewer::UpdateCornerInfoAll() {
@@ -1200,6 +1199,7 @@ void DICOMImageViewer::UpdateCornerInfoAll() {
         UpdateCornerInfo(RIGHT_MIDDLE);
         UpdateCornerInfo(LEFT_MIDDLE);
         UpdateCornerInfo(TOP_MIDDLE);
+        this->Render();
     } else {
         cornerAnnotation->ClearAllTexts();
         this->Render();

src/src/UI/Widget/ImageView/dicomimageview.cpp

@@ -254,8 +254,10 @@ void DicomImageView::fusionWindowChanged(double level, double width) {
 }
 
 void DicomImageView::imageTransformed() {
+    if (hasSeries()){
     mImageViewer->UpdateOrientationInfo();
     mImageViewer->Render();
+    }
 }
 
 void DicomImageView::clicked() {
@@ -430,6 +432,7 @@ void DicomImageView::clearFusionContext() {
 //Callbacks------------------------------------------------------------------------------------
 void DicomImageView::windowLevelHandle() {
     mImageViewer->UpdateCornerInfo(BOTTOM_RIGHT);
+    mImageViewer->Render();
     emit onFusionWindowChange(mImageViewer->GetColorLevel(), mImageViewer->GetColorWindow());
 }
 
@@ -490,7 +493,6 @@ void DicomImageView::render() {
     if (hasSeries()) {
         mImageViewer->Render();
     }
-
 }
 
 int DicomImageView::getReconPlane() {
@@ -576,6 +578,7 @@ void DicomImageView::setWindowLevel(double level, double width) {
         //You have to call updateConerInfo manually
         //only mouse event can rely on callback
         mImageViewer->UpdateCornerInfo(BOTTOM_RIGHT);
+        mImageViewer->Render();
         emit onFusionWindowChange(level, width);
 
     }
@@ -677,6 +680,7 @@ void DicomImageView::updateCornerInfoAll() {
 void DicomImageView::updateCornerInfoPrivacy() {
     if (hasSeries()) {
         mImageViewer->UpdateCornerInfo(TOP_RIGHT);
+        mImageViewer->Render();
     }
 }