[vtk-developers] Two memory leaks in rendering

[Jonathan Morra]

Thanks for looking into this, I appreciate it, I'll let you know how it
goes.
On Apr 25, 2012 9:45 PM, "Clinton Stimpson" <clinton at elemtech.com> wrote:

>
> Here's a fix for the leaks from the mousePressEvent.
> http://review.source.kitware.com/#/c/5360/
> Its based off the release branch in case there is time to merge it.
>
> I'm still unable to reproduce leaks from your mouseMoveEvent() code, but
> you could try again after applying the patch to fix the other one.
> Or maybe someone else can report whether they see that leak.
>
> Clint
>
> On Apr 25, 2012, at 7:44 PM, Jonathan Morra wrote:
>
> I have posted a version of this program to the users mailing list before
> but got minimal response.  Since I have discovered a different memory leak
> in rendering.  These two memory leaks are making my program extremely
> unstable, as they get magnified when rendering large objects.  I'm stuck in
> my development cycle until these rendering issues get resolved, as a result
> I am very motivated to provide any extra comments, data, work that I can to
> help fix this problem.
>
> Reproduced below is a test program that causes 2 memory issues in Windows
> 7 (both x86 and x64).  Please let me know if you can reproduce these
> problems or not, and if you can fix them.  Currently I'm hooking in GDCM as
> well (although not in this test program), so I cannot easily move to VTK 6
> as GDCM currently does not compile for VTK 6, so if these bugs can be fixed
> on the release branch, that would be amazing.
>
> Again, please contact me if you have any questions or would like more
> information.
>
> Thanks
>
> #include <QtGui/QApplication>
>
> #include <QMainWindow>
>
> #include <QVTKWidget2.h>
>
> #include <vtkImageViewer2.h>
>
> #include <vtkImageData.h>
>
> #include <vtkPointData.h>
>
> #include <vtkGenericOpenGLRenderWindow.h>
>
> #include <vtkSphereSource.h>
>
> #include <vtkPolyDataMapper.h>
>
> #include <vtkActor.h>
>
> #include <vtkRenderer.h>
>
> #include <vtkRenderWindow.h>
>
> // This program shows 2 separate bugs with rendering.
>
> /**
>
>   First, if you run the program as provided, and either move the mouse over the image
>
>   or press the mouse, notice that the memory stays constant.  The first bug involves consuming memory
>
>   on a render command when we're just rendering an image.  In order to see this, comment in the
>
>   commented out line in the mouseMoveEvent method.  Notice that as you mouse around the memory now increases.
>
>   The second bug involves rendering after an actor has been added.  If you comment in the one
>
>   commented out line in mousePressEvent, you now see the memory jump significantly after each
>
>   mouse press.
>
>     I'm testing these on Qt 4.8.0 x64 Windows VS 2008, VTK pulled from git release branch, tag
>
>   5.10.0-rc1.  I'm monitoring the memory using the Windows Task Manager.
>
>   */
>
> class MyQVTKWidget2 : public QVTKWidget2 {
>
>     vtkSmartPointer<vtkRenderer> renderer;
>
> public:
>
>     MyQVTKWidget2 (vtkSmartPointer<vtkImageViewer2> imageViewer, QWidget *parent = 0) : QVTKWidget2(parent) {
>
>         this->imageViewer = imageViewer;
>
>         renderer = vtkSmartPointer<vtkRenderer>::New();
>
>         GetRenderWindow()->AddRenderer(renderer);
>
>     }
>
>     virtual ~MyQVTKWidget2() {
>
>     }
>
>     void mouseMoveEvent(QMouseEvent *) {
>
>         for (int i=0; i<1000; ++i) {
>
>             //imageViewer->Render();
>
>         }
>
>     }
>
>     void mousePressEvent(QMouseEvent *) {
>
>         vtkSmartPointer<vtkSphereSource> sphereSource = vtkSmartPointer<vtkSphereSource>::New();
>
>         sphereSource->Update();
>
>         for (int i=0; i<1000; ++i) {
>
>             vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
>
>             mapper->SetInput(sphereSource->GetOutput());
>
>             mapper->Update();
>
>             vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
>
>             actor->SetMapper(mapper);
>
>             renderer->AddActor(actor);
>
>             //renderer->Render();
>
>             renderer->RemoveActor(actor);
>
>         }
>
>     }
>
> private:
>
>     vtkSmartPointer<vtkImageViewer2> imageViewer;
>
> };
>
> int main(int argc, char *argv[]) {
>
>     QApplication a(argc, argv);
>
>     vtkSmartPointer<vtkImageData> imageData = vtkSmartPointer<vtkImageData>::New();
>
>     imageData->SetExtent(0, 100, 0, 100, 0, 100);
>
>     imageData->SetOrigin(0, 0, 0);
>
>     imageData->SetSpacing(1, 1, 1);
>
>     imageData->AllocateScalars();
>
>     imageData->GetPointData()->GetScalars()->FillComponent(0, 0);
>
>     vtkSmartPointer<vtkImageViewer2> imageViewer = vtkSmartPointer<vtkImageViewer2>::New();
>
>     imageViewer->SetInput(imageData);
>
>     MyQVTKWidget2 *widget = new MyQVTKWidget2(imageViewer);
>
>     imageViewer->SetRenderWindow(widget->GetRenderWindow());
>
>     QMainWindow mainWindow;
>
>     mainWindow.setGeometry(200, 200, 300, 300);
>
>     mainWindow.setCentralWidget(widget);
>
>     mainWindow.show();
>
>     return a.exec();
>
> }
>
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