BootAnimation: Fix boot animation with hidden cutout

We do this by storing the masking inset in a persistent property.
The boot animation then animates itself to where it would be if that
masking inset were applied, then changes the viewport.

For this to work, we also need to make sure the DisplayManagerService
has the right overlay right at the start.

Bug: 112876936
Test: Hide cutout, then reboot. Verify boot animation is smooth.
Change-Id: I3e988b2340b2e0d2be3939bdc6878704c234ccc8

1 files changed, 48 insertions, 1 deletions

diff --git a/cmds/bootanimation/BootAnimation.cpp b/cmds/bootanimation/BootAnimation.cpp
index 8ffe5bf59315..ed6c25dc49c3 100644
--- a/cmds/bootanimation/BootAnimation.cpp
+++ b/cmds/bootanimation/BootAnimation.cpp
@@ -302,6 +302,7 @@ status_t BootAnimation::readyToRun() {
     mHeight = h;
     mFlingerSurfaceControl = control;
     mFlingerSurface = s;
+    mTargetInset = -1;
 
     // If the device has encryption turned on or is in process
     // of being encrypted we show the encrypted boot animation.
@@ -942,6 +943,7 @@ bool BootAnimation::playAnimation(const Animation& animation)
                 if (mClockEnabled && mTimeIsAccurate && validClock(part)) {
                     drawClock(animation.clockFont, part.clockPosX, part.clockPosY);
                 }
+                handleViewport(frameDuration);
 
                 eglSwapBuffers(mDisplay, mSurface);
 
@@ -966,7 +968,7 @@ bool BootAnimation::playAnimation(const Animation& animation)
             usleep(part.pause * ns2us(frameDuration));
 
             // For infinite parts, we've now played them at least once, so perhaps exit
-            if(exitPending() && !part.count)
+            if(exitPending() && !part.count && mCurrentInset >= mTargetInset)
                 break;
         }
 
@@ -986,6 +988,51 @@ bool BootAnimation::playAnimation(const Animation& animation)
     return true;
 }
 
+void BootAnimation::handleViewport(nsecs_t timestep) {
+    if (mShuttingDown || !mFlingerSurfaceControl || mTargetInset == 0) {
+        return;
+    }
+    if (mTargetInset < 0) {
+        // Poll the amount for the top display inset. This will return -1 until persistent properties
+        // have been loaded.
+        mTargetInset = android::base::GetIntProperty("persist.sys.displayinset.top",
+                -1 /* default */, -1 /* min */, mHeight / 2 /* max */);
+    }
+    if (mTargetInset <= 0) {
+        return;
+    }
+
+    if (mCurrentInset < mTargetInset) {
+        // After the device boots, the inset will effectively be cropped away. We animate this here.
+        float fraction = static_cast<float>(mCurrentInset) / mTargetInset;
+        int interpolatedInset = (cosf((fraction + 1) * M_PI) / 2.0f + 0.5f) * mTargetInset;
+
+        SurfaceComposerClient::Transaction()
+                .setCrop(mFlingerSurfaceControl, Rect(0, interpolatedInset, mWidth, mHeight))
+                .apply();
+    } else {
+        // At the end of the animation, we switch to the viewport that DisplayManager will apply
+        // later. This changes the coordinate system, and means we must move the surface up by
+        // the inset amount.
+        sp<IBinder> dtoken(SurfaceComposerClient::getBuiltInDisplay(
+                ISurfaceComposer::eDisplayIdMain));
+
+        Rect layerStackRect(0, 0, mWidth, mHeight - mTargetInset);
+        Rect displayRect(0, mTargetInset, mWidth, mHeight);
+
+        SurfaceComposerClient::Transaction t;
+        t.setPosition(mFlingerSurfaceControl, 0, -mTargetInset)
+                .setCrop(mFlingerSurfaceControl, Rect(0, mTargetInset, mWidth, mHeight));
+        t.setDisplayProjection(dtoken, 0 /* orientation */, layerStackRect, displayRect);
+        t.apply();
+
+        mTargetInset = mCurrentInset = 0;
+    }
+
+    int delta = timestep * mTargetInset / ms2ns(200);
+    mCurrentInset += delta;
+}
+
 void BootAnimation::releaseAnimation(Animation* animation) const
 {
     for (Vector<Animation::Part>::iterator it = animation->parts.begin(),