Android4.4 增加屏幕旋转功能

由于Android4.4系统上去掉了ro.sf.hwrotation属性的支持，因为不能使用之前的方法进行屏幕旋转了。暂时没有找到相应的属性和后门，于是自己写了一个屏幕旋转的临时代码，后面找到更好的方法后再替换。具体代码如下：

 

~/framework/native/services/surfaceflinger/DisplayDevice.cpp

uint32_t DisplayDevice::getOrientationTransform() const {

    ...

    if (property_get("persist.sys.hwrotation", property, NULL) > 0) { 

        switch (atoi(property)) {

            case 90:

                transform = Transform::ROT_90;

                break;

            case 270:

                transform = Transform::ROT_270;

                break;

         }

     }

     return transform;

}

 

status_t DisplayDevice::orientationToTransfrom(

        int orientation, int w, int h, Transform* tr)

{

    ...

    if (property_get("persist.sys.hwrotation", property, NULL) > 0) { 

        switch (atoi(property)) {

            case 90:

                flags = Transform::ROT_90;

                break;

            case 270:

                flags = Transform::ROT_270;

                break;

         }

    }

    tr->set(flags, w, h);

    return NO_ERROR;

}

void DisplayDevice::setProjection(int orientation,

        const Rect& newViewport, const Rect& newFrame) {

    ...

    if (!frame.isValid()) {

        if (property_get("persist.sys.hwrotation", property, NULL) > 0) { 

            switch (atoi(property)) {

                case 90:

                case 270:

                    frame = Rect(h, w);

                    break;

                default:

                    frame = Rect(w, h);

                    break;

            }

        } else

            frame = Rect(w, h);

    } else {

        ...

    }

}

 

~/framework/base/services/input/InputReader.cpp

void TouchInputMapper::configureSurface(nsecs_t when, bool* outResetNeeded) {

    ...

    if (property_get("persist.sys.hwrotation", property, NULL) > 0) { 

        switch (atoi(property)) {

            case 90:

                mSurfaceOrientation = DISPLAY_ORIENTATION_90;

                break;

            case 270:

                mSurfaceOrientation = DISPLAY_ORIENTATION_270;

                break;

         }

    }

        switch (mSurfaceOrientation) {

        case DISPLAY_ORIENTATION_90:

        case DISPLAY_ORIENTATION_270:

}

 

~/framework/native/services/surfaceflinger/SurfaceFlinger.cpp

status_t SurfaceFlinger::getDisplayInfo(const sp<IBinder>& display, DisplayInfo* info) {

    ...

    info->w = hwc.getWidth(type);

    info->h = hwc.getHeight(type);

    

    if (property_get("persist.sys.hwrotation", property, NULL) > 0) {

        switch (atoi(property)) {

            case 90:

            case 270:

                if (type != DisplayDevice::DISPLAY_EXTERNAL) {

                    info->w = hwc.getHeight(type);

                    info->h = hwc.getWidth(type);

                }

                break;

            default:

                break;

        }

    }

    info->xdpi = xdpi;

    info->ydpi = ydpi;

    info->fps = float(1e9 / hwc.getRefreshPeriod(type));

    ...

}

 

void SurfaceFlinger::onInitializeDisplays() {

    ...

    d.orientation = DisplayState::eOrientationDefault;

 

    char property[PROPERTY_VALUE_MAX];

    if (property_get("persist.sys.hwrotation", property, NULL) > 0){

        switch (atoi(property)) {

            case 0:

                d.orientation = DisplayState::eOrientationDefault;

                break;

            case 90:

                d.orientation = DisplayState::eOrientation90;

                break;

            case 180:

                d.orientation = DisplayState::eOrientation180;

                break;

            case 270:

                d.orientation = DisplayState::eOrientation270;

                break;

            default:

                d.orientation = DisplayState::eOrientationDefault;

                break;

         }

    } else {

         d.orientation = DisplayState::eOrientationDefault;

    }

 

    d.frame.makeInvalid();

    d.viewport.makeInvalid();

}

 

~/framework/base/services/java/com/android/server/wm/WindowManagerService.java

boolean updateOrientationFromAppTokensLocked(boolean inTransaction) {

    ...

    if (req != mForcedAppOrientation) {

          if ("0".equals(SystemProperties.get("persist.sys.hwrotation", "0")))

              req = ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT;

          else if ("90".equals(SystemProperties.get("persist.sys.hwrotation", "0")))

              req = ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;

          else if ("180".equals(SystemProperties.get("persist.sys.hwrotation", "0")))

              req = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;

          else if ("270".equals(SystemProperties.get("persist.sys.hwrotation", "0")))

              req = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;

          else

              req = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;

      }

    ...

}