Android4.4系统增加LCD 屏幕旋转功能

来源：互联网发布：父母 linux 编辑：程序博客网时间：2024/05/21 19:49

转载自 http://blog.csdn.net/wlwl0071986/article/details/51225087 我以前修改是太后面了，导致开机logo 会部分不旋转，试试这个文章，感觉修改地方比较合理，试试看，感谢原作者。

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;
      }

...

}

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