Method DrawImage

Rendering/ContextOpenGL2/vtkOpenGLContextDevice2D.cxx:1750–1798

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//------------------------------------------------------------------------------
void vtkOpenGLContextDevice2D::DrawImage(float p[2], float scale, vtkImageData* image)
{
  vtkOpenGLGL2PSHelper* gl2ps = vtkOpenGLGL2PSHelper::GetInstance();
  if (gl2ps)
  {
    switch (gl2ps->GetActiveState())
    {
      case vtkOpenGLGL2PSHelper::Capture:
        this->DrawImageGL2PS(p, scale, image);
        return;
      case vtkOpenGLGL2PSHelper::Background:
        return; // Do nothing.
      case vtkOpenGLGL2PSHelper::Inactive:
        break; // Draw as normal.
    }
  }

  vtkOpenGLClearErrorMacro();

  this->SetTexture(image);
  this->Storage->Texture->Render(this->Renderer);
  int* extent = image->GetExtent();
  float points[] = { p[0], p[1], p[0] + scale * extent[1] + 1.0f, p[1],
    p[0] + scale * extent[1] + 1.0f, p[1] + scale * extent[3] + 1.0f, p[0], p[1],
    p[0] + scale * extent[1] + 1.0f, p[1] + scale * extent[3] + 1.0f, p[0],
    p[1] + scale * extent[3] + 1.0f };

  float texCoord[] = { 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f };

  vtkOpenGLClearErrorMacro();

  this->ReadyVTBOProgram();
  vtkOpenGLHelper* cbo = this->VTBO;
  if (!cbo->Program)
  {
    return;
  }
  int tunit = vtkOpenGLTexture::SafeDownCast(this->Storage->Texture)->GetTextureUnit();
  cbo->Program->SetUniformi("texture1", tunit);

  this->BuildVBO(cbo, points, 6, nullptr, 0, texCoord);
  this->SetMatrices(cbo->Program);

  glDrawArrays(GL_TRIANGLES, 0, 6);

  this->Storage->Texture->PostRender(this->Renderer);

  vtkOpenGLCheckErrorMacro("failed after DrawImage");
}

//------------------------------------------------------------------------------
void vtkOpenGLContextDevice2D::DrawPolyData(