Ejemplo n.º 1
0
extern "C" int fbdevws_IsValidDisplay(EGLNativeDisplayType display)
{
	if (__sync_fetch_and_add(&inited,1)==0)
	{
		int err;
		err = hw_get_module(GRALLOC_HARDWARE_MODULE_ID, (const hw_module_t **) &gralloc);
		if (gralloc==NULL) {
			fprintf(stderr, "failed to get gralloc module: (%s)\n",strerror(-err));
			assert(0);
		}

		err = framebuffer_open((hw_module_t *) gralloc, &framebuffer);
		if (err) {
			fprintf(stderr, "ERROR: failed to open framebuffer: (%s)\n",strerror(-err));
			assert(0);
		}
		printf("** framebuffer_open: status=(%s) format=x%x", strerror(-err), framebuffer->format);

		err = gralloc_open((const hw_module_t *) gralloc, &alloc);
		if (err) {
			fprintf(stderr, "ERROR: failed to open gralloc: (%s)\n",strerror(-err));
			assert(0);
		}
		printf("** gralloc_open %p status=%s\n", gralloc, strerror(-err));
		eglplatformcommon_init(gralloc);
	}

	return display == EGL_DEFAULT_DISPLAY;
}
Ejemplo n.º 2
0
// Opens Framebuffer device
static void openFramebufferDevice(hwc_context_t *ctx)
{
    hw_module_t const *module;
    if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module) == 0) {
        framebuffer_open(module, &(ctx->mFbDev));
    }
}
FramebufferNativeWindow::FramebufferNativeWindow() 
    : BASE(), fbDev(0), grDev(0), mUpdateOnDemand(false)
{
    hw_module_t const* module;
    if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module) == 0) {
        int stride;
        int err;
        err = framebuffer_open(module, &fbDev);
        LOGE_IF(err, "couldn't open framebuffer HAL (%s)", strerror(-err));
        
        err = gralloc_open(module, &grDev);
        LOGE_IF(err, "couldn't open gralloc HAL (%s)", strerror(-err));

        // bail out if we can't initialize the modules
        if (!fbDev || !grDev)
            return;
        
        mUpdateOnDemand = (fbDev->setUpdateRect != 0);
        
        // initialize the buffer FIFO
        mNumBuffers = 2;
        mNumFreeBuffers = 2;
        mBufferHead = mNumBuffers-1;
        buffers[0] = new NativeBuffer(
                fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB);
        buffers[1] = new NativeBuffer(
                fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB);
        
        err = grDev->alloc(grDev,
                fbDev->width, fbDev->height, fbDev->format, 
                GRALLOC_USAGE_HW_FB, &buffers[0]->handle, &buffers[0]->stride);

        LOGE_IF(err, "fb buffer 0 allocation failed w=%d, h=%d, err=%s",
                fbDev->width, fbDev->height, strerror(-err));

        err = grDev->alloc(grDev,
                fbDev->width, fbDev->height, fbDev->format, 
                GRALLOC_USAGE_HW_FB, &buffers[1]->handle, &buffers[1]->stride);

        LOGE_IF(err, "fb buffer 1 allocation failed w=%d, h=%d, err=%s",
                fbDev->width, fbDev->height, strerror(-err));

        const_cast<uint32_t&>(android_native_window_t::flags) = fbDev->flags; 
        const_cast<float&>(android_native_window_t::xdpi) = fbDev->xdpi;
        const_cast<float&>(android_native_window_t::ydpi) = fbDev->ydpi;
        const_cast<int&>(android_native_window_t::minSwapInterval) = 
            fbDev->minSwapInterval;
        const_cast<int&>(android_native_window_t::maxSwapInterval) = 
            fbDev->maxSwapInterval;
    } else {
        LOGE("Couldn't get gralloc module");
    }

    android_native_window_t::setSwapInterval = setSwapInterval;
    android_native_window_t::dequeueBuffer = dequeueBuffer;
    android_native_window_t::lockBuffer = lockBuffer;
    android_native_window_t::queueBuffer = queueBuffer;
    android_native_window_t::query = query;
    android_native_window_t::perform = perform;
}
Ejemplo n.º 4
0
FbDevice::FbDevice(){
    hw_module_t const *module;
    if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module) == 0) {
        framebuffer_open(module, &sFb);
    } else {
       ALOGE("FATAL ERROR: framebuffer open failed.");
    }
}
Ejemplo n.º 5
0
bool Hwcomposer::initialize()
{
    int err;
    log.d("initialize");

    // open frame buffer device
    hw_module_t const* module;
    err = hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module);
    if (err) {
        log.e("Hwcomposer::initialize: failed to load gralloc module, %d", err);
        return false;
    }

    IMG_gralloc_module_public_t *imgGrallocModule;
    imgGrallocModule = (IMG_gralloc_module_public_t*)module;

    // open frame buffer device
    err = framebuffer_open(module, (framebuffer_device_t**)&mFBDev);
    if (err) {
        log.e("Hwcomposer::initialize: failed to open frame buffer device, %d",
              err);
        return false;
    }

    mFBDev->bBypassPost = 1;

    // create display plane manager
    mPlaneManager = createDisplayPlaneManager();
    if (!mPlaneManager || !mPlaneManager->initialize()) {
        log.e("initialize: failed to create display plane manager");
        goto dpm_create_err;
    }

    // create display device
    for (int i = 0; i < IDisplayDevice::DEVICE_COUNT; i++) {
        IDisplayDevice *device = createDisplayDevice(i, *mPlaneManager);
        if (!device || !device->initialize()) {
            log.e("initialize: failed to create device %d", i);
            continue;
        }
        // add this device
        mDisplayDevices.insertAt(device, i, 1);
    }

    mInitialized = true;
    return true;
device_create_err:
    for (size_t i = 0; i < mDisplayDevices.size(); i++) {
        IDisplayDevice *device = mDisplayDevices.itemAt(i);
        delete device;
    }
dpm_create_err:
    framebuffer_close((framebuffer_device_t*)mFBDev);
    mInitialized = false;
    return false;
}
Ejemplo n.º 6
0
void hybris_gralloc_initialize(int framebuffer)
{
    if (version == -1) {
        if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, (const struct hw_module_t **)&gralloc_hardware_module) == 0) {
#if HAS_GRALLOC1_HEADER
            if ((gralloc1_open(gralloc_hardware_module, &gralloc1_device) == 0) && (gralloc1_device != NULL)) {
                // success
                gralloc1_init();
                version = 1;
                atexit(hybris_gralloc_deinitialize);
            } else
#endif
            if (framebuffer) {
                if (framebuffer_open(gralloc_hardware_module, &framebuffer_device) == 0) {
                    if ((gralloc_open(gralloc_hardware_module, &gralloc0_alloc) == 0) && gralloc0_alloc != NULL) {
                        // success
                        gralloc0_module = (struct gralloc_module_t*)gralloc_hardware_module;
                        version = 0;
                        atexit(hybris_gralloc_deinitialize);
                    } else {
                        fprintf(stderr, "failed to open the gralloc 0 module (framebuffer was requested therefore defaulted to version 0)\n");
                        assert(NULL);
                    }
                } else {
                    fprintf(stderr, "failed to open the framebuffer module\n");
                    assert(NULL);
                }
            } else
            if ((gralloc_open(gralloc_hardware_module, &gralloc0_alloc) == 0) && gralloc0_alloc != NULL) {
                // success
                gralloc0_module = (struct gralloc_module_t*)gralloc_hardware_module;
                version = 0;
                atexit(hybris_gralloc_deinitialize);
            } else {
                // fail
                framebuffer_device = NULL;
#if HAS_GRALLOC1_HEADER
                gralloc1_device = NULL;
#endif
                version = -2;
                fprintf(stderr, "failed to open gralloc module with both version 0 and 1 methods\n");
                hybris_gralloc_deinitialize();
                assert(NULL);
            }
        } else {
            fprintf(stderr, "failed to find/load gralloc module\n");
            assert(NULL);
        }
    } else {
        // shouldn't reach here.
        assert(NULL);
    }
}
Ejemplo n.º 7
0
extern "C" int fbdevws_IsValidDisplay(EGLNativeDisplayType display)
{
	if (__sync_fetch_and_add(&inited,1)==0)
	{
		hw_get_module(GRALLOC_HARDWARE_MODULE_ID, (const hw_module_t **) &gralloc);
		int err = framebuffer_open((hw_module_t *) gralloc, &framebuffer);
		printf("** open framebuffer HAL (%s) format x%x\n", strerror(-err), framebuffer->format);
		err = gralloc_open((const hw_module_t *) gralloc, &alloc);
		printf("** got gralloc %p err:%s\n", gralloc, strerror(-err));
		eglplatformcommon_init(gralloc);
	}

	return display == EGL_DEFAULT_DISPLAY;
}
Ejemplo n.º 8
0
extern "C" int ws_fbdev_IsValidDisplay(EGLNativeDisplayType display)
{
	if (inited == 0)
	{	
  	    hw_get_module(GRALLOC_HARDWARE_MODULE_ID, (const hw_module_t **) &gralloc);
	    int err = framebuffer_open((hw_module_t *) gralloc, &framebuffer);
    	    printf("open framebuffer HAL (%s) format %i", strerror(-err), framebuffer->format);
 
	    err = gralloc_open((const hw_module_t *) gralloc, &alloc);
            printf("got gralloc %p err:%s\n", gralloc, strerror(-err));
	    inited = 1;	
	}
	return display == EGL_DEFAULT_DISPLAY; 
}
Ejemplo n.º 9
0
// Opens Framebuffer device
static void openFramebufferDevice(hwc_context_t *ctx)
{
    hw_module_t const *module;
    if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module) == 0) {
        framebuffer_open(module, &(ctx->mFbDev));
        private_module_t* m = reinterpret_cast<private_module_t*>(
                ctx->mFbDev->common.module);
        //xres, yres may not be 32 aligned
        ctx->dpyAttr[HWC_DISPLAY_PRIMARY].xres = m->info.xres;
        ctx->dpyAttr[HWC_DISPLAY_PRIMARY].yres = m->info.yres;
        ctx->dpyAttr[HWC_DISPLAY_PRIMARY].xdpi = ctx->mFbDev->xdpi;
        ctx->dpyAttr[HWC_DISPLAY_PRIMARY].ydpi = ctx->mFbDev->ydpi;
        ctx->dpyAttr[HWC_DISPLAY_PRIMARY].vsync_period =
                1000000000l / ctx->mFbDev->fps;
        ctx->dpyAttr[HWC_DISPLAY_PRIMARY].fd = openFb(HWC_DISPLAY_PRIMARY);
    }
}
Ejemplo n.º 10
0
std::shared_ptr<framebuffer_device_t> mga::ResourceFactory::create_fb_native_device() const
{
    hw_module_t const* module;
    framebuffer_device_t* fbdev_raw;

    auto rc = hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module);
    if ((rc != 0) || (module == nullptr) || (framebuffer_open(module, &fbdev_raw) != 0) )
    {
        BOOST_THROW_EXCEPTION(std::runtime_error("display factory cannot create fb display"));
    }

    return std::shared_ptr<framebuffer_device_t>(fbdev_raw,
                      [](struct framebuffer_device_t* fbdevice)
                      {
                         fbdevice->common.close((hw_device_t*) fbdevice);
                      });
}
Ejemplo n.º 11
0
int 
main (int argc, char **argv)
{
  int i;

  for (i = 1; i < argc; i++) {
    if (!strcmp ("--verbose", argv[i]) || !strcmp ("-v", argv[i])) {
      Verbose = 1;
      continue;
    }
    if (!strcmp ("--multiblit", argv[i])) {
      WantMultiBlit = 1;
      continue;
    }

    if (!strcmp ("--cycles", argv[i])) {
      if (++i>=argc) usage ();
      TotalCycles = atoi(argv[i]);
      if (TotalCycles < 1) usage();
      continue;
    }

    usage();
  }

  if (framebuffer_open(NULL, NULL) == -1)
    {
      perror("framebuffer_open failed.");
      exit(0);
    }


  framebuffer_blit();

  framebuffer_close();

  return 0;
}
Ejemplo n.º 12
0
FramebufferNativeWindow::FramebufferNativeWindow() 
    : BASE(), fbDev(0), grDev(0), mUpdateOnDemand(false)
{
    hw_module_t const* module;
    if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module) == 0) {
        int stride;
        int err;
        int i;
        err = framebuffer_open(module, &fbDev);
        ALOGE_IF(err, "couldn't open framebuffer HAL (%s)", strerror(-err));
        
        err = gralloc_open(module, &grDev);
        ALOGE_IF(err, "couldn't open gralloc HAL (%s)", strerror(-err));

        // bail out if we can't initialize the modules
        if (!fbDev || !grDev)
            return;
        
        mUpdateOnDemand = (fbDev->setUpdateRect != 0);
        
        // initialize the buffer FIFO
        if(fbDev->numFramebuffers >= MIN_NUM_FRAME_BUFFERS &&
           fbDev->numFramebuffers <= MAX_NUM_FRAME_BUFFERS){
            mNumBuffers = fbDev->numFramebuffers;
        } else {
            mNumBuffers = MIN_NUM_FRAME_BUFFERS;
        }
        mNumFreeBuffers = mNumBuffers;
        mBufferHead = mNumBuffers-1;

        /*
         * This does not actually change the framebuffer format. It merely
         * fakes this format to surfaceflinger so that when it creates
         * framebuffer surfaces it will use this format. It's really a giant
         * HACK to allow interworking with buggy gralloc+GPU driver
         * implementations. You should *NEVER* need to set this for shipping
         * devices.
         */
#ifdef FRAMEBUFFER_FORCE_FORMAT
        *((uint32_t *)&fbDev->format) = FRAMEBUFFER_FORCE_FORMAT;
#endif

        for (i = 0; i < mNumBuffers; i++)
        {
                buffers[i] = new NativeBuffer(
                        fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB);
        }

        for (i = 0; i < mNumBuffers; i++)
        {
                err = grDev->alloc(grDev,
                        fbDev->width, fbDev->height, fbDev->format,
                        GRALLOC_USAGE_HW_FB, &buffers[i]->handle, &buffers[i]->stride);

                ALOGE_IF(err, "fb buffer %d allocation failed w=%d, h=%d, err=%s",
                        i, fbDev->width, fbDev->height, strerror(-err));

                if (err)
                {
                        mNumBuffers = i;
                        mNumFreeBuffers = i;
                        mBufferHead = mNumBuffers-1;
                        break;
                }
        }

        const_cast<uint32_t&>(ANativeWindow::flags) = fbDev->flags; 
        const_cast<float&>(ANativeWindow::xdpi) = fbDev->xdpi;
        const_cast<float&>(ANativeWindow::ydpi) = fbDev->ydpi;
        const_cast<int&>(ANativeWindow::minSwapInterval) = 
            fbDev->minSwapInterval;
        const_cast<int&>(ANativeWindow::maxSwapInterval) = 
            fbDev->maxSwapInterval;
    } else {
        ALOGE("Couldn't get gralloc module");
    }

    ANativeWindow::setSwapInterval = setSwapInterval;
    ANativeWindow::dequeueBuffer = dequeueBuffer;
    ANativeWindow::lockBuffer = lockBuffer;
    ANativeWindow::queueBuffer = queueBuffer;
    ANativeWindow::query = query;
    ANativeWindow::perform = perform;
    ANativeWindow::cancelBuffer = NULL;
}
FramebufferNativeWindow::FramebufferNativeWindow()
    : BASE(), fbDev(0), grDev(0), mUpdateOnDemand(false)
{
    hw_module_t const* module;
    if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module) == 0) {
        int stride;
        int err;
#ifdef OMAP_ENHANCEMENT
        int i;
#endif
        err = framebuffer_open(module, &fbDev);
        LOGE_IF(err, "couldn't open framebuffer HAL (%s)", strerror(-err));
        
        err = gralloc_open(module, &grDev);
        LOGE_IF(err, "couldn't open gralloc HAL (%s)", strerror(-err));

        // bail out if we can't initialize the modules
        if (!fbDev || !grDev)
            return;
        
        mUpdateOnDemand = (fbDev->setUpdateRect != 0);
        
        // initialize the buffer FIFO
#ifdef OMAP_ENHANCEMENT
        mNumBuffers = NUM_FRAME_BUFFERS;
        mNumFreeBuffers = NUM_FRAME_BUFFERS;
#else
        mNumBuffers = 2;
        mNumFreeBuffers = 2;
#endif
        mBufferHead = mNumBuffers-1;
#ifdef OMAP_ENHANCEMENT
        for(i = 0; i < NUM_FRAME_BUFFERS; i++){
            buffers[i] = new NativeBuffer(
                    fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB);
        }

        for(i = 0; i < NUM_FRAME_BUFFERS; i++){
            err = grDev->alloc(grDev,
                    fbDev->width, fbDev->height, fbDev->format,
                    GRALLOC_USAGE_HW_FB, &buffers[i]->handle, &buffers[i]->stride);

            LOGE_IF(err, "fb buffer %d allocation failed w=%d, h=%d, err=%s",
                    i, fbDev->width, fbDev->height, strerror(-err));

            if(err){
                mNumBuffers = i;
                mNumFreeBuffers = i;
                mBufferHead = mNumBuffers-1;
                break;
            }
       }
#else
        buffers[0] = new NativeBuffer(
                fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB);
        buffers[1] = new NativeBuffer(
                fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB);
        
        err = grDev->alloc(grDev,
                fbDev->width, fbDev->height, fbDev->format, 
                GRALLOC_USAGE_HW_FB, &buffers[0]->handle, &buffers[0]->stride);

        LOGE_IF(err, "fb buffer 0 allocation failed w=%d, h=%d, err=%s",
                fbDev->width, fbDev->height, strerror(-err));

        err = grDev->alloc(grDev,
                fbDev->width, fbDev->height, fbDev->format, 
                GRALLOC_USAGE_HW_FB, &buffers[1]->handle, &buffers[1]->stride);

        LOGE_IF(err, "fb buffer 1 allocation failed w=%d, h=%d, err=%s",
                fbDev->width, fbDev->height, strerror(-err));
#endif
        const_cast<uint32_t&>(ANativeWindow::flags) = fbDev->flags; 
        const_cast<float&>(ANativeWindow::xdpi) = fbDev->xdpi;
        const_cast<float&>(ANativeWindow::ydpi) = fbDev->ydpi;
        const_cast<int&>(ANativeWindow::minSwapInterval) = 
            fbDev->minSwapInterval;
        const_cast<int&>(ANativeWindow::maxSwapInterval) = 
            fbDev->maxSwapInterval;
    } else {
        LOGE("Couldn't get gralloc module");
    }

    ANativeWindow::setSwapInterval = setSwapInterval;
    ANativeWindow::dequeueBuffer = dequeueBuffer;
    ANativeWindow::lockBuffer = lockBuffer;
    ANativeWindow::queueBuffer = queueBuffer;
    ANativeWindow::cancelBuffer = NULL;
    ANativeWindow::query = query;
    ANativeWindow::perform = perform;
    ANativeWindow::cancelBuffer = 0;
#ifdef OMAP_ENHANCEMENT
    LOGE("%d buffers flip-chain implementation enabled\n", mNumBuffers);
#endif
}
FramebufferNativeWindow::FramebufferNativeWindow() 
    : BASE(), fbDev(0), grDev(0), mUpdateOnDemand(false)
{
    hw_module_t const* module;
    if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module) == 0) {
        int stride;
        int err;
        err = framebuffer_open(module, &fbDev);
        LOGE_IF(err, "couldn't open framebuffer HAL (%s)", strerror(-err));
        
        err = gralloc_open(module, &grDev);
        LOGE_IF(err, "couldn't open gralloc HAL (%s)", strerror(-err));

        // bail out if we can't initialize the modules
        if (!fbDev || !grDev)
            return;
        
        mUpdateOnDemand = (fbDev->setUpdateRect != 0);
        
        // initialize the buffer FIFO
        mNumBuffers = 2;
        mNumFreeBuffers = 2;
        mBufferHead = mNumBuffers-1;
        buffers[0] = new NativeBuffer(
                fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB);
        buffers[1] = new NativeBuffer(
                fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB);
        
        err = grDev->alloc(grDev,
                fbDev->width, fbDev->height, fbDev->format, 
                GRALLOC_USAGE_HW_FB, &buffers[0]->handle, &buffers[0]->stride);

        LOGE_IF(err, "fb buffer 0 allocation failed w=%d, h=%d, err=%s",
                fbDev->width, fbDev->height, strerror(-err));

        err = grDev->alloc(grDev,
                fbDev->width, fbDev->height, fbDev->format, 
                GRALLOC_USAGE_HW_FB, &buffers[1]->handle, &buffers[1]->stride);

        LOGE_IF(err, "fb buffer 1 allocation failed w=%d, h=%d, err=%s",
                fbDev->width, fbDev->height, strerror(-err));

        const_cast<uint32_t&>(android_native_window_t::flags) = fbDev->flags; 
        const_cast<float&>(android_native_window_t::xdpi) = fbDev->xdpi;
        const_cast<float&>(android_native_window_t::ydpi) = fbDev->ydpi;
        const_cast<int&>(android_native_window_t::minSwapInterval) = 
            fbDev->minSwapInterval;
        const_cast<int&>(android_native_window_t::maxSwapInterval) = 
            fbDev->maxSwapInterval;
    } else {
        LOGE("Couldn't get gralloc module");
    }

    android_native_window_t::setSwapInterval = setSwapInterval;
    android_native_window_t::dequeueBuffer = dequeueBuffer;
    android_native_window_t::lockBuffer = lockBuffer;
    android_native_window_t::queueBuffer = queueBuffer;
    android_native_window_t::query = query;
    android_native_window_t::perform = perform;
    //[BEGIN] add by ethaen
     android_native_window_t::fd = getDeviceFD();
    //END

    //[END]

// [BEGIN] skyviia modify: fix lock display issue if framework reboot without unlock display.
// fix me!
#ifdef SV886X
//        if (ioctl(android_native_window_t::fd, SKYFB_UNLOCK_DISPLAY) == -1) {
//            LOGE("unlock display failed !\n");
//        } else {
//            LOGI("unlock display OK !\n");
//        }
#endif
// [END]

}
Ejemplo n.º 15
0
FramebufferNativeWindow::FramebufferNativeWindow() 
    : BASE(), fbDev(0), grDev(0), mUpdateOnDemand(false)
{
    hw_module_t const* module;
    if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module) == 0) {
        int stride;
        int err;
        err = framebuffer_open(module, &fbDev);
        LOGE_IF(err, "couldn't open framebuffer HAL (%s)", strerror(-err));
        
        err = gralloc_open(module, &grDev);
        LOGE_IF(err, "couldn't open gralloc HAL (%s)", strerror(-err));

        // bail out if we can't initialize the modules
        if (!fbDev || !grDev) {
            if (grDev) {
                gralloc_close(grDev);
                grDev = 0;
            }
            if (fbDev) {
                framebuffer_close(fbDev);
                fbDev = 0;
            }
            return;
        }
        
        mUpdateOnDemand = (fbDev->setUpdateRect != 0);
        
        // initialize the buffer FIFO
        mNumBuffers = fbDev->numFramebuffers;
        mNumFreeBuffers = mNumBuffers;
        mBufferHead = 0;
        LOGD("mNumBuffers = %d", mNumBuffers);
        for(int i = 0; i < mNumBuffers; i++) {
            buffers[i] = new NativeBuffer(
                fbDev->width, fbDev->height, fbDev->format, GRALLOC_USAGE_HW_FB);

            err = grDev->alloc(grDev,
                fbDev->width, fbDev->height, fbDev->format, 
                GRALLOC_USAGE_HW_FB, &buffers[i]->handle, &buffers[i]->stride);

            LOGE_IF(err, "fb buffer %d allocation failed w=%d, h=%d, err=%s",
                i, fbDev->width, fbDev->height, strerror(-err));
        }

        const_cast<uint32_t&>(ANativeWindow::flags) = fbDev->flags; 
        const_cast<float&>(ANativeWindow::xdpi) = fbDev->xdpi;
        const_cast<float&>(ANativeWindow::ydpi) = fbDev->ydpi;
        const_cast<int&>(ANativeWindow::minSwapInterval) = 
            fbDev->minSwapInterval;
        const_cast<int&>(ANativeWindow::maxSwapInterval) = 
            fbDev->maxSwapInterval;
    } else {
        LOGE("Couldn't get gralloc module");
    }

    ANativeWindow::setSwapInterval = setSwapInterval;
    ANativeWindow::dequeueBuffer = dequeueBuffer;
    ANativeWindow::lockBuffer = lockBuffer;
    ANativeWindow::queueBuffer = queueBuffer;
    ANativeWindow::cancelBuffer = NULL;
    ANativeWindow::query = query;
    ANativeWindow::perform = perform;
}