Blocking Display till android boot

[Kiran Kumar]

Hello All,

My requirement is the following,

1. Show bootloader logo, till android home screen comes up,

2. Disable bootnaimation in android,

3. Block displaying any frames to primary display till android home screen comes up.

Bootanimation is commented out in init.rc

Disabling keyguard is done in the frameworks/base/core/res/res/value

<!-- Whether to enable KeyguardService or not -->

<bool name="config_enableKeyguardService">true</bool>

To block the frames rendering to the primary display surfaceflinger is modified as below,

void SurfaceFlinger::onMessageReceived(int32_t what) {
    ATRACE_CALL();
    switch (what) {
        case MessageQueue::TRANSACTION: {
            handleMessageTransaction();
            break;
        }
        case MessageQueue::INVALIDATE: {
            bool refreshNeeded = handleMessageTransaction();
            refreshNeeded |= handleMessageInvalidate();
            refreshNeeded |= mRepaintEverything;
            if (refreshNeeded) {
                // Signal a refresh if a transaction modified the window state,
                // a new buffer was latched, or if HWC has requested a full
                // repaint
                signalRefresh();
            }
            break;
        }
        case MessageQueue::REFRESH: {
                 if (isToBeDisplayEnabled) //Condition to check when to start rendering
                handleMessageRefresh();
                  }
            break;
        }
    }
}

I am setting the flag isTobeDisplayEnabled, in the function 
void SurfaceFlinger::bootFinished()
{
    const nsecs_t now = systemTime();
    const nsecs_t duration = now - mBootTime;
    ALOGI("Boot is finished (%ld ms)", long(ns2ms(duration)) );
    mBootFinished = true;

    // wait patiently for the window manager death
    const String16 name("window");
    sp<IBinder> window(defaultServiceManager()->getService(name));
    if (window != 0) {
        window->linkToDeath(static_cast<IBinder::DeathRecipient*>(this));
    }

    // stop boot animation
    // formerly we would just kill the process, but we now ask it to exit so it
    // can choose where to stop the animation.
    property_set("service.bootanim.exit", "1");

          isToBeDisplayEnabled = true;
}


But what i am seeing is when transition happens from Bootloader to android homescreen, 
there is rotated screen or there is a blank screen displayed before the android homescreen is visible. 

What may be the problem here how to correct the problems,