Constantly in the process of rendering a function is called?

Question

C++ / C#

bool__ keyboard::IsMouseButtonUp(byte key, bool__ bonus)
{
  if(keyboard__->msg_->message==WM_RBUTTONUP || keyboard__->msg_->message==WM_LBUTTONUP &&!bonus)
  {
    GetButtonDownCoords();
    if(point.y >607 && point.y<683)
    {
      if(point.x >245 && point.x<345)
        setF(false, 0);
      if(point.x >352 && point.x<455)
        setF(false, 1);
      if(point.x >461 && point.x<561)
        setF(false, 2);
      if(point.x >569 && point.x<668)
      {
        if(getF(3))
          SetBet_(GetBet_() + 1);
        setF(false, 3);	
      }
      if(point.x >677 && point.x<777)
      {
        setF(false, 4);
        setdone(true);
      }
    }
    return true;
  }
  else
    if (keyboard__->msg_->message == WM_RBUTTONUP || keyboard__->msg_->message == WM_LBUTTONUP && bonus)
    {
      int__ j = 0;
      for (int__ i = 0; i < countF; i++)
      {
        if (getF(i))
        {
          j++;
          break;
        }
      }
      if (j)
      {
        GetButtonDownCoords();
        if (point.y > 286 && point.y < 417)
        {
          if (point.x > 65 && point.x < 190)
            setF(false, 1);
          if (point.x > 261 && point.x < 381)
          {
            setF(false, 0);
            GetRandom();
          }
          if (point.x > 436 && point.x < 582)
          {
            setF(false, 2);
            GetRandom();
          }
          if (point.x > 632 && point.x < 774)
          {
            setF(false, 3);
            GetRandom();
          }

          if (point.x > 820 && point.x < 961)
          {
            setF(false, 4);
            GetRandom();
          }
        }
      }
      return true;
    }
  if(VK_RBUTTON==key)
  {
    return true;
  }
  return false;
}
bool__ keyboard::IsKeyUp(byte key, bool__ bonus)
{
  if (keyboard__->msg_->message == WM_KEYUP && !bonus)
  {
    switch (key)
    {
    case VK_F1:
    {
      setF(false, 0);
      //setF(true, 0);
      break;
    }
    case VK_F2:
    {
      setF(false, 1);
      //setF(true, 1);
      break;
    }
    case VK_F3:
    {
      setF(false, 2);
      //setF(true, 2);
      break;
    }
    case VK_F4:
    {
      if (getF(3))
        SetBet_(GetBet_() + 1);
      setF(false, 3);
      //setF(true, 3);
      break;
    }
    case VK_F5:
    {
      setF(false, 4);
      //setF(true, 4);
      setdone(true);
      break;
    }
    }
  }
  else if (keyboard__->msg_->message == WM_KEYUP && bonus)
  {
    int__ j = 0;
    for (int__ i = 0; i < countF; i++)
    {
      if (getF(i))
      {
        j++;
        break;
      }
    }
    if (j)
    {
      switch (key)
      {
      case VK_F1:
      {
        setF(false, 1);
        break;
      }
      case VK_F2:
      {
        setF(false, 0);
        GetRandom();
        break;
      }
      case VK_F3:
      {
        setF(false, 2);
        GetRandom();
        break;
      }
      case VK_F4:
      {
        setF(false, 3);
        GetRandom();
        break;
      }
      case VK_F5:
      {
        setF(false, 4);
        GetRandom();
        break;
      }
      }
    }
  }
  return(true);
}

Where bonus==true, the GetRandom() generator is called, I tried to get rid of it by entering the j variable, but the code is still called all the time while the bonus one is working