[vtkusers] vtkImageImport memory not freed

[kenichiro yoshimi]

Hi,

I am not sure, but it looks like vtkImageReader2 can read a raw volume
directly from a file without using a temporary variable. Would the
vtkImageReader2 reader solve your problem?

Thanks,

2017-06-04 7:16 GMT+09:00 Mike Withascarf via vtkusers <vtkusers at vtk.org>:
> Hi, I'm attempting to use vtkImageImport on an array in a function to return
> a vtkImageData. It works, but once the vtkImageData is deleted the memory is
> not freed unless I do a DeepCopy in the function for loading it.
> Unfortunately if I do a DeepCopy it momentarily doubles the amount of memory
> needed which is really bad for the large data sizes we are using. Here is a
> stripped down version of the function I'm using. Any help would be very
> appreciated!
>
> vtkSmartPointer<vtkImageData> load_image(const std::string &fn)
> {
> unsigned long long size = 6144000000;
> int dims[3]{ 800, 600, 6400 };
>
> // load data
> ifstream fs(fn, ifstream::binary);
> char* data = new char[size];
> fs.read(data, size);
> fs.close();
>
> // vtk import
> vtkSmartPointer<vtkImageImport> image_import =
> vtkSmartPointer<vtkImageImport>::New();
> image_import->SetDataSpacing(1, 1, 1);
> image_import->SetDataOrigin(0, 0, 0);
> image_import->SetWholeExtent(0, dims[0] - 1, 0, dims[1] - 1, 0, dims[2] -
> 1);
> image_import->SetDataExtentToWholeExtent();
> image_import->SetDataScalarTypeToUnsignedShort();
> image_import->SetNumberOfScalarComponents(1);
> image_import->SetImportVoidPointer(data);
> image_import->Update();
>
> // This works, but the memory will never be released even when the
> vtkImageData is deleted
> return image_import->GetOutput();
> // This prevents memory leaks, but means that I need twice the memory
> available for a brief moment
> vtkSmartPointer<vtkImageData> im = vtkSmartPointer<vtkImageData>::New();
> im->DeepCopy(image_import->GetOutput());
> delete[] data;
> return im;
> }
>
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