Method WriteFile

IO/Image/vtkBMPWriter.cxx:85–175

}

void vtkBMPWriter::WriteFile(ostream* file, vtkImageData* data, int extent[6], int wExtent[6])
{
  int idx1, idx2;
  int rowLength, rowAdder, i; // in bytes
  unsigned char* ptr;
  int bpp;
  unsigned long count = 0;
  unsigned long target;
  float progress = this->Progress;
  float area;

  bpp = data->GetNumberOfScalarComponents();

  // Make sure we actually have data.
  if (!data->GetPointData()->GetScalars())
  {
    vtkErrorMacro(<< "Could not get data from input.");
    return;
  }

  // take into consideration the scalar type
  if (data->GetScalarType() != VTK_UNSIGNED_CHAR)
  {
    vtkErrorMacro("BMPWriter only accepts unsigned char scalars!");
    return;
  }

  // Row length of x axis
  rowLength = extent[1] - extent[0] + 1;
  rowAdder = (4 - ((extent[1] - extent[0] + 1) * 3) % 4) % 4;

  area = ((extent[5] - extent[4] + 1) * (extent[3] - extent[2] + 1) * (extent[1] - extent[0] + 1)) /
    ((wExtent[5] - wExtent[4] + 1) * (wExtent[3] - wExtent[2] + 1) * (wExtent[1] - wExtent[0] + 1));

  target =
    (unsigned long)((extent[5] - extent[4] + 1) * (extent[3] - extent[2] + 1) / (50.0 * area));
  target++;

  for (idx2 = extent[4]; idx2 <= extent[5]; ++idx2)
  {
    for (idx1 = extent[2]; idx1 <= extent[3]; idx1++)
    {
      if (!(count % target))
      {
        this->UpdateProgress(progress + count / (50.0 * target));
      }
      count++;
      ptr = (unsigned char*)data->GetScalarPointer(extent[0], idx1, idx2);
      if (bpp == 1)
      {
        for (i = 0; i < rowLength; i++)
        {
          file->put(ptr[i]);
          file->put(ptr[i]);
          file->put(ptr[i]);
        }
      }
      if (bpp == 2)