Method DrawPixels

Rendering/OpenGL2/vtkOpenGLImageMapper.cxx:630–679

}

void vtkOpenGLImageMapper::DrawPixels(
  vtkViewport* viewport, int width, int height, int numComponents, void* data)
{
  int* actorPos = this->Actor->GetActualPositionCoordinate()->GetComputedViewportValue(viewport);
  int* actorPos2 = this->Actor->GetActualPosition2Coordinate()->GetComputedViewportValue(viewport);

  float xscale = 1.0;
  float yscale = 1.0;
  if (this->GetRenderToRectangle())
  {
    int rectwidth = (actorPos2[0] - actorPos[0]) + 1;
    int rectheight = (actorPos2[1] - actorPos[1]) + 1;
    xscale = static_cast<float>(rectwidth) / width;
    yscale = static_cast<float>(rectheight) / height;
  }

  vtkPolyData* pd = vtkPolyDataMapper2D::SafeDownCast(this->Actor->GetMapper())->GetInput();
  vtkPoints* points = pd->GetPoints();
  points->SetPoint(0, 0.0, 0.0, 0);
  points->SetPoint(1, width * xscale, 0.0, 0);
  points->SetPoint(2, width * xscale, height * yscale, 0);
  points->SetPoint(3, 0.0, height * yscale, 0);
  points->GetData()->Modified();

  vtkDataArray* tcoords = pd->GetPointData()->GetTCoords();
  float tmp[2];
  tmp[0] = 0;
  tmp[1] = 0;
  tcoords->SetTuple(0, tmp);
  tmp[0] = 1.0;
  tcoords->SetTuple(1, tmp);
  tmp[1] = 1.0;
  tcoords->SetTuple(2, tmp);
  tmp[0] = 0.0;
  tcoords->SetTuple(3, tmp);
  tcoords->Modified();

  vtkImageData* id = vtkImageData::New();
  id->SetExtent(0, width - 1, 0, height - 1, 0, 0);
  vtkUnsignedCharArray* uca = vtkUnsignedCharArray::New();
  uca->SetNumberOfComponents(numComponents);
  uca->SetArray((unsigned char*)data, width * height * numComponents, true);
  id->GetPointData()->SetScalars(uca);
  uca->Delete();

  this->Actor->GetTexture()->SetInputData(id);

  this->Actor->RenderOverlay(viewport);
  id->Delete();
}

void vtkOpenGLImageMapper::PrintSelf(ostream& os, vtkIndent indent)
{