修改横屏显示

zangcf

最终方法：修改文件frameworks/native/services/surfaceflinger/DisplayDevice.cpp
DisplayDevice:isplayDevice(
        const sp<SurfaceFlinger>& flinger,
        DisplayType type,
        int32_t hwcId,
        int format,
        bool isSecure,
        const wp<IBinder>& displayToken,
        const sp<DisplaySurface>& displaySurface,
        const sp<IGraphicBufferProducer>& producer,
        EGLConfig config)
    : lastCompositionHadVisibleLayers(false),
      mFlinger(flinger),
      mType(type), mHwcDisplayId(hwcId),
      mDisplayToken(displayToken),
      mDisplaySurface(displaySurface),
      mDisplay(EGL_NO_DISPLAY),
      mSurface(EGL_NO_SURFACE),
      mDisplayWidth(), mDisplayHeight(), mFormat(),
      mFlags(),
      mPageFlipCount(),
      mIsSecure(isSecure),
      mSecureLayerVisible(false),
      mLayerStack(NO_LAYER_STACK),
      mOrientation(),
      mPowerMode(HWC_POWER_MODE_OFF),
      mActiveConfig(0)
{
    mNativeWindow = new Surface(producer, false);
    ANativeWindow* const window = mNativeWindow.get();

    /*
     * Create our display's surface
     */

    EGLSurface surface;
    EGLint w, h;
    EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
    if (config == EGL_NO_CONFIG) {
        config = RenderEngine::chooseEglConfig(display, format);
    }
    surface = eglCreateWindowSurface(display, config, window, NULL);
    eglQuerySurface(display, surface, EGL_WIDTH,  &mDisplayWidth);
    eglQuerySurface(display, surface, EGL_HEIGHT, &mDisplayHeight);

    // Make sure that composition can never be stalled by a virtual display
    // consumer that isn't processing buffers fast enough. We have to do this
    // in two places:
    // * Here, in case the display is composed entirely by HWC.
    // * In makeCurrent(), using eglSwapInterval. Some EGL drivers set the
    //   window's swap interval in eglMakeCurrent, so they'll override the
    //   interval we set here.
    if (mType >= DisplayDevice:ISPLAY_VIRTUAL)
        window->setSwapInterval(window, 0);

    mConfig = config;
    mDisplay = display;
    mSurface = surface;
    mFormat  = format;
    mPageFlipCount = 0;
    mViewport.makeInvalid();
    mFrame.makeInvalid();

    // virtual displays are always considered enabled
    mPowerMode = (mType >= DisplayDevice:ISPLAY_VIRTUAL) ?
                  HWC_POWER_MODE_NORMAL : HWC_POWER_MODE_OFF;
#ifdef MTK_AOSP_ENHANCEMENT
    mHwOrientation = DisplayState::eOrientation90;
    mHwcMirrorId = -1;
#endif

    // Name the display.  The name will be replaced shortly if the display
    // was created with createDisplay().
    switch (mType) {
        case DISPLAY_PRIMARY:
            mDisplayName = "Built-in Screen";
#ifdef MTK_AOSP_ENHANCEMENT
            switch (mFlinger->sPropertiesState.mHwRotation) {
                case 90:
                    mHwOrientation = DisplayState::eOrientation90;
                    break;
                case 180:
                    mHwOrientation = DisplayState::eOrientation180;
                    break;
                case 270:
                    mHwOrientation = DisplayState::eOrientation270;
                    break;
            }
#endif
            break;
        case DISPLAY_EXTERNAL:
            mDisplayName = "HDMI Screen";
            break;
        default:
            mDisplayName = "Virtual Screen";    // e.g. Overlay #n
            break;
    }

    // initialize the display orientation transform.
    setProjection(DisplayState::eOrientation90, mViewport, mFrame);
}
好了