CCSize CCDirector::getVisibleSize()
{
    if (m_pobOpenGLView)
    {
        return m_pobOpenGLView->getVisibleSize();
    }
    else 
    {
        return CCSizeZero;
    }
}

CCPoint CCDirector::getVisibleOrigin()
{
    if (m_pobOpenGLView)
    {
        return m_pobOpenGLView->getVisibleOrigin();
    }
    else 
    {
        return CCPointZero;
    }
}

-->>
kResolutionNoBorder只有这种适配模式，需要特殊对待， 其他情况都一样。
而我们现在只关注 kResolutionFixedHeight：高度固定  这种适配，所以
VisibleSize和winSize是一样的。
CCSize  CCEGLViewProtocol::getVisibleSize() const
{
    if (m_eResolutionPolicy == kResolutionNoBorder)
    {
        return CCSizeMake(m_obScreenSize.width/m_fScaleX,m_obScreenSize.height/m_fScaleY);
    }
    else 
    {
        return m_obDesignResolutionSize;
    }
}

CCPoint CCEGLViewProtocol::getVisibleOrigin() const
{
    if (m_eResolutionPolicy == kResolutionNoBorder)
    {
        return CCPointMake((m_obDesignResolutionSize.width - m_obScreenSize.width/m_fScaleX)/2,(m_obDesignResolutionSize.height - m_obScreenSize.height/m_fScaleY)/2);
    }
    else 
    {
        return CCPointZero;
    }
}