Method RenderData

Rendering/OpenGL2/vtkOpenGLImageMapper.cxx:579–628

// Expects data to be X, Y, components

void vtkOpenGLImageMapper::RenderData(vtkViewport* viewport, vtkImageData* data, vtkActor2D* actor)
{
  void* ptr0;
  double shift, scale;

  vtkWindow* window = viewport->GetVTKWindow();
  if (!window)
  {
    vtkErrorMacro(<< "vtkOpenGLImageMapper::RenderData - no window set for viewport");
    return;
  }

  if (!data->GetPointData()->GetScalars())
  {
    return;
  }

  this->Actor->SetProperty(actor->GetProperty());

  // Make this window current. May have become not current due to
  // data updates since the render started.
  window->MakeCurrent();

  vtkOpenGLClearErrorMacro();

  shift = this->GetColorShift();
  scale = this->GetColorScale();

  ptr0 =
    data->GetScalarPointer(this->DisplayExtent[0], this->DisplayExtent[2], this->DisplayExtent[4]);

  // Get the position of the image actor
  int* actorPos = actor->GetActualPositionCoordinate()->GetComputedViewportValue(viewport);
  // negative positions will already be clipped to viewport
  actorPos[0] += this->PositionAdjustment[0];
  actorPos[1] += this->PositionAdjustment[1];

  this->Actor->SetPosition(actorPos[0], actorPos[1]);
  this->Actor->SetPosition2(actor->GetPosition2());

  switch (data->GetPointData()->GetScalars()->GetDataType())
  {
    vtkTemplateMacro(
      vtkOpenGLImageMapperRender(this, data, static_cast<VTK_TT*>(ptr0), shift, scale, viewport));
    default:
      vtkErrorMacro(<< "Unsupported image type: " << data->GetScalarType());
  }

  vtkOpenGLCheckErrorMacro("failed after RenderData");
}

void vtkOpenGLImageMapper::DrawPixels(
  vtkViewport* viewport, int width, int height, int numComponents, void* data)