cocos2dx android winSize 由来

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//float width, float height 设计分辨率

//resolutionPolicy 适配策略  这里用kResolutionFixedHeight：高度固定

void CCEGLViewProtocol::setDesignResolutionSize(float width, float height, ResolutionPolicy resolutionPolicy)
{CCAssert(resolutionPolicy != kResolutionUnKnown, "should set resolutionPolicy");if (width == 0.0f || height == 0.0f){return;}//设置设计分辨率m_obDesignResolutionSize.setSize(width, height);//计算缩放比率  m_obScreenSize(屏幕大小)m_fScaleX = (float)m_obScreenSize.width / m_obDesignResolutionSize.width;m_fScaleY = (float)m_obScreenSize.height / m_obDesignResolutionSize.height;if (resolutionPolicy == kResolutionNoBorder){m_fScaleX = m_fScaleY = MAX(m_fScaleX, m_fScaleY);}if (resolutionPolicy == kResolutionShowAll){m_fScaleX = m_fScaleY = MIN(m_fScaleX, m_fScaleY);}//我们这里使用的，高度固定的意思，就是高度的缩放比例固定，根据高度缩放比率计算宽度//这里会根据我们设置的设计分辨率，然后根据适配策略，调整设计分辨率if ( resolutionPolicy == kResolutionFixedHeight) {m_fScaleX = m_fScaleY;m_obDesignResolutionSize.width = ceilf(m_obScreenSize.width/m_fScaleX);}if ( resolutionPolicy == kResolutionFixedWidth) {m_fScaleY = m_fScaleX;m_obDesignResolutionSize.height = ceilf(m_obScreenSize.height/m_fScaleY);}// calculate the rect of viewport    float viewPortW = m_obDesignResolutionSize.width * m_fScaleX;float viewPortH = m_obDesignResolutionSize.height * m_fScaleY;m_obViewPortRect.setRect((m_obScreenSize.width - viewPortW) / 2, (m_obScreenSize.height - viewPortH) / 2, viewPortW, viewPortH);m_eResolutionPolicy = resolutionPolicy;// reset director's member variables to fit visible rect//下面说明：CCDirector::sharedDirector()->m_obWinSizeInPoints = getDesignResolutionSize();CCDirector::sharedDirector()->createStatsLabel();CCDirector::sharedDirector()->setGLDefaultValues();
}

通过这句赋值：

 m_obWinSizeInPoints = m_pobOpenGLView->getDesignResolutionSize();

我们平时使用的接口，获取winSize:

 CCSize CCDirector::getWinSize(void)
{return m_obWinSizeInPoints;
}

举例：

小米2s 720*1280

设计分辨率 640*960

固定高度,缩放比率：

720/640 = 1.125

计算宽度为：1280/1.125 = 1138

由此得到我们的winSize为：640*1138

通过打印信息得到：

03-16 20:49:22.579: D/cocos2d-x debug info(8833): [LUA-print] =====winSize  width=====1138
03-16 20:49:22.579: D/cocos2d-x debug info(8833): [LUA-print] =====winSize  height=====640

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