Method ExecuteInformation

IO/Image/vtkHDRReader.cxx:56–101

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
void vtkHDRReader::ExecuteInformation()
{
  // if the user has not set the extent, but has set the VOI
  // set the zaxis extent to the VOI z axis
  if (this->DataExtent[4] == 0 && this->DataExtent[5] == 0 &&
    (this->DataVOI[4] || this->DataVOI[5]))
  {
    this->DataExtent[4] = this->DataVOI[4];
    this->DataExtent[5] = this->DataVOI[5];
  }

  // Setup filename to read the header
  this->ComputeInternalFileName(this->DataExtent[4]);
  if (this->InternalFileName == nullptr || this->InternalFileName[0] == '\0')
  {
    return;
  }

  // Fill headers data, HeaderSize and DataExtent
  // VTK errors are handled in ReadHeaderData.
  if (!this->ReadHeaderData())
  {
    return;
  }
  this->CloseFile();

  // if the user has set the VOI, just make sure its valid
  if (this->DataVOI[0] || this->DataVOI[1] || this->DataVOI[2] || this->DataVOI[3] ||
    this->DataVOI[4] || this->DataVOI[5])
  {
    if ((this->DataVOI[0] < 0) || (this->DataVOI[1] >= this->GetWidth()) ||
      (this->DataVOI[2] < 0) || (this->DataVOI[3] >= this->GetHeight()))
    {
      vtkWarningMacro(
        "The requested VOI is larger than the file's (" << this->InternalFileName << ") extent ");
      this->DataVOI[0] = this->DataExtent[0];
      this->DataVOI[1] = this->DataExtent[1];
      this->DataVOI[2] = this->DataExtent[2];
      this->DataVOI[3] = this->DataExtent[3];
    }
  }

  this->SetDataScalarTypeToFloat();
  this->SetNumberOfScalarComponents(3);
  this->vtkImageReader::ExecuteInformation();
}

//------------------------------------------------------------------------------
int vtkHDRReader::CanReadFile(const char* fname)