Method DrawImageGL2PS

Rendering/ContextOpenGL2/vtkOpenGLContextDevice2D.cxx:2745–2776

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//------------------------------------------------------------------------------
void vtkOpenGLContextDevice2D::DrawImageGL2PS(float p[2], vtkImageData* input)
{
  // Must be unsigned char -- otherwise OpenGL rendering behaves badly anyway.
  if (!vtkDataTypesCompare(input->GetScalarType(), VTK_UNSIGNED_CHAR))
  {
    vtkErrorMacro("Invalid image format: Expected unsigned char scalars.");
    return;
  }

  // Convert to float for GL2PS
  vtkNew<vtkImageData> image;
  image->ShallowCopy(input);
  vtkDataArray* s = image->GetPointData()->GetScalars();
  size_t numVals = (s->GetNumberOfComponents() * s->GetNumberOfTuples());
  unsigned char* vals = vtkAOSDataArrayTemplate<unsigned char>::FastDownCast(s)->GetPointer(0);
  vtkNew<vtkFloatArray> scalars;
  scalars->SetNumberOfComponents(s->GetNumberOfComponents());
  scalars->SetNumberOfTuples(s->GetNumberOfTuples());
  for (size_t i = 0; i < numVals; ++i)
  {
    scalars->SetValue(static_cast<vtkIdType>(i), vals[i] / 255.f);
  }
  image->GetPointData()->SetScalars(scalars);

  // Instance always exists when this method is called:
  vtkOpenGLGL2PSHelper* gl2ps = vtkOpenGLGL2PSHelper::GetInstance();

  float tp[2] = { p[0], p[1] };
  this->TransformPoint(tp[0], tp[1]);
  double pos[3] = { static_cast<double>(tp[0]), static_cast<double>(tp[1]), 0. };
  gl2ps->DrawImage(image, pos);
}

//------------------------------------------------------------------------------
void vtkOpenGLContextDevice2D::DrawImageGL2PS(float p[2], float scale, vtkImageData* image)