android屏幕旋转在framework中的修改

Android 竖屏启动 


1）kernel 竖屏
选中：
make menuconfig ---> Device Drivers  ---> Graphics support  ---> Console display driver support  ---> Framebuffer Console Rotation


make menuconfig 
                ---> Boot options  启动参数修改为：console=ttySAC2,115200 init=/linuxrc fbcon=rotate:1


2）Android OS 竖屏
文件：frameworks/base/libs/surfaceflinger/SurfaceFlinger.cpp
重要提示：在不同的android版本中，上面的路径可能有所不同，但都在framework/base这个路径下，可以搜索下，就能找到

void GraphicPlane::setDisplayHardware(DisplayHardware *hw)
{
    mHw = hw;


    // initialize the display orientation transform.
    // it's a constant that should come from the display driver.
    //int displayOrientation = ISurfaceComposer::eOrientationDefault;   // 这行被注释掉
    int displayOrientation = ISurfaceComposer::eOrientation90;          // 加上这行
    char property[PROPERTY_VALUE_MAX];
    if (property_get("ro.sf.hwrotation", property, NULL) > 0) {
        //displayOrientation
        switch (atoi(property)) {
        case 90:
            displayOrientation = ISurfaceComposer::eOrientation90;
            break;
        case 270:
            displayOrientation = ISurfaceComposer::eOrientation270;
            break;
        }
    }


    const float w = hw->getWidth();
    const float h = hw->getHeight();
    GraphicPlane::orientationToTransfrom(displayOrientation, w, h,
            &mDisplayTransform);
    if (displayOrientation & ISurfaceComposer::eOrientationSwapMask) {
        mDisplayWidth = h;
        mDisplayHeight = w;
    } else {
        mDisplayWidth = w;
        mDisplayHeight = h;
    }


    setOrientation(ISurfaceComposer::eOrientationDefault);
}


触摸：这块需要修改你的触摸屏驱动


#else /* !CONFIG_CPU_S5PV210_EVT1 */
ts->yp += S3C_ADCDAT0_XPDATA_MASK_12BIT - (data0 & S3C_ADCDAT0_XPDATA_MASK_12BIT);
#endif /* !CONFIG_CPU_S5PV210_EVT1 */
ts->xp += S3C_ADCDAT1_YPDATA_MASK_12BIT - (data1 & S3C_ADCDAT1_YPDATA_MASK_12BIT);
#endif /* CONFIG_TOUCHSCREEN_NEW */

下面的搞死我了，不知道怎么改，

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平板电脑一般是默认横屏， 竖屏的APP程序， 会自动旋转90°， 由于是顺时针转90°， 需要改为逆时针转90°； 也就是要把portrait改逆时针转90°，修改点如下：

PhoneWindowManager.java(\\192.168.1.4\opt\android_froyo_smdk\frameworks\policies\base\phone\com\android\internal\policy\impl)

public int rotationForOrientationLw(int orientation, int lastRotation,

boolean displayEnabled) {

if (mPortraitRotation < 0) {

// Initialize the rotation angles for each orientation once.

Display d =((WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE))

.getDefaultDisplay();

if (d.getWidth() > d.getHeight()) {

mPortraitRotation = Surface.ROTATION_270;//Surface.ROTATION_90;

mLandscapeRotation =Surface.ROTATION_0;

} else {

mPortraitRotation =Surface.ROTATION_0;

mLandscapeRotation = Surface.ROTATION_270;//Surface.ROTATION_90;

}

}

一下是参考文章------------------------------------------------------------------------------------------------------

本行实现以后才发现，google在1.5到2.2这个过程中改进了很多，1.5修改竖屏比较麻烦，而2.2是相当的容易！
其实基本上google将之前版本的默认为竖屏的做法进行了改进，不需要再花费更多力气在屏幕的默认横竖切换上面。1.还是kernel竖屏，可以显示到屏幕出现"A N D R O I D"字样
  启动参数里加入fbcon=rotate:1    (0:正常屏; 1:顺时钟转90度; 2:转180度; 3:顺时钟转270度;)
最后生成的autoconf.h里有类似项：
#define CONFIG_CMDLINE "console=ttySAC0,115200 fbcon=rotate:1"此项的解析在$(kernel)/drivers/video/console/fbcon.c
static int __init fb_console_setup(char *this_opt);
只是去初始化变量initial_rotation，然后initial_rotation会传递给其他需要的结构。
要选上：Device Drivers -> Graphics support -> Console display driver support ->Framebuffer Console support -> Framebuffer Console Rotation
注意：参考$(kernel)/documentation/fb/fbcon.txt2.android OS旋转屏幕
froyo中已经相当容易，仅修改一处：
frameworks/base/libs/surfaceflinger/SurfaceFlinger.cpp
void GraphicPlane::setDisplayHardware(DisplayHardware *hw)
{
    mHw = hw;    // initialize the display orientation transform.
    // it's a constant that should come from the display driver.
//    int displayOrientation = ISurfaceComposer::eOrientationDefault;
    int displayOrientation = ISurfaceComposer::eOrientation90; //jeff.
    。。。
}
或者只在init.rc中增加一项：
setprop ro.sf.hwrotation 90就这么简单的一修改，就可以全程竖屏显示了！