Method CheckRenderingEnabled

libs/drape_frontend/base_renderer.cpp:144–205

}

void BaseRenderer::CheckRenderingEnabled()
{
  if (!m_isEnabled)
  {
    dp::GraphicsContext * context = nullptr;

    if (m_wasContextReset)
    {
      using namespace std::placeholders;
      EnableMessageFiltering(std::bind(&BaseRenderer::FilterContextDependentMessage, this, _1));
      OnContextDestroy();
      CHECK(m_contextCounter > 0, ());
      m_contextCounter--;
    }
    else
    {
      bool const isDrawContext = m_threadName == ThreadsCommutator::RenderThread;
      context = isDrawContext ? m_contextFactory->GetDrawContext() : m_contextFactory->GetResourcesUploadContext();
      context->SetRenderingEnabled(false);
    }

    OnRenderingDisabled();

    // notify initiator-thread about rendering disabling
    Notify();

    // wait for signal
    std::unique_lock<std::mutex> lock(m_renderingEnablingMutex);
    m_renderingEnablingCondition.wait(lock, [this] { return m_wasNotified; });

    m_wasNotified = false;

    bool needCreateContext = false;
    if (!m_selfThread.GetRoutine()->IsCancelled())
    {
      // here rendering is enabled again
      m_isEnabled = true;

      if (m_wasContextReset)
      {
        m_wasContextReset = false;
        needCreateContext = true;
      }
      else
      {
        context->SetRenderingEnabled(true);
      }
    }

    if (needCreateContext)
      DisableMessageFiltering();

    // notify initiator-thread about rendering enabling
    // m_renderingEnablingCompletionHandler will be setup before awakening of this thread
    Notify();

    OnRenderingEnabled();