cocos2dx 2.x 屏幕适配问题

在CCEGLViewProtocol.h中提供方法：

virtual void setDesignResolutionSize(float width,
float height, ResolutionPolicy resolutionPolicy);
其中前面两个参数即为当前解决方案的长宽，第三个参数定义如下：

enum ResolutionPolicy
{
    // The entire application is visible in the specified area without trying to preserve the original aspect ratio.
    // Distortion can occur, and the application may appear stretched or compressed.
    kResolutionExactFit,
    // The entire application fills the specified area, without distortion but possibly with some cropping,
    // while maintaining the original aspect ratio of the application.
    kResolutionNoBorder,
    // The entire application is visible in the specified area without distortion while maintaining the original
    // aspect ratio of the application. Borders can appear on two sides of the application.
    kResolutionShowAll,
    // The application takes the height of the design resolution size and modifies the width of the internal
    // canvas so that it fits the aspect ratio of the device
    // no distortion will occur however you must make sure your application works on different
    // aspect ratios
    kResolutionFixedHeight,
    // The application takes the width of the design resolution size and modifies the height of the internal
    // c
4000
anvas so that it fits the aspect ratio of the device
    // no distortion will occur however you must make sure your application works on different
    // aspect ratios
    kResolutionFixedWidth,

    kResolutionUnKnown,
};
google翻译一下：
1. kResolutionExactFit：整个应用程序在指定区域中可见，而不尝试保留原始长宽比，可能发生失真，可能会显示拉伸或者压缩

2. kResolutionNoBorder：整个应用程序填充指定的区域，没有失真，但可能有一些裁剪，保持原始长宽比

3. kResolutionShowAll：显示所有内容，保持长宽比，会显示黑边

4. kResolutionFixedHeight：保持height的数据适配，width会超出屏幕或者黑边

5. kResolutionFixedWidth：保持width的数据适配，height会超出屏幕或者黑边

6. kResolutionUnKnown：此版本不支持此参数。