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Commit f1e99946 authored by Rob Carr's avatar Rob Carr Committed by Automerger Merge Worker
Browse files

Merge "SurfaceFlinger: Detect Rel Z loops" into tm-dev am: a8ceadf9 

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/17301625

Change-Id: Ifc383bc9cc12221979a44c4546c13197f1a15330
parents b8718871 a8ceadf9

services/surfaceflinger/Layer.cpp

+31 −0
Original line number Diff line number Diff line
@@ -833,6 +833,14 @@ bool Layer::setRelativeLayer(const sp<IBinder>& relativeToHandle, int32_t relati 
        return false;

    }



    if (CC_UNLIKELY(relative->usingRelativeZ(LayerVector::StateSet::Drawing)) &&

        (relative->mDrawingState.zOrderRelativeOf == this)) {

        ALOGE("Detected relative layer loop between %s and %s",

              mName.c_str(), relative->mName.c_str());

        ALOGE("Ignoring new call to set relative layer");

        return false;

    }



    mFlinger->mSomeChildrenChanged = true;



    mDrawingState.sequence++;
@@ -1990,6 +1998,18 @@ void Layer::prepareShadowClientComposition(LayerFE::LayerSettings& caster, 
    }

}



bool Layer::findInHierarchy(const sp<Layer>& l) {

    if (l == this) {

        return true;

    }

    for (auto& child : mDrawingChildren) {

      if (child->findInHierarchy(l)) {

          return true;

      }

    }

    return false;

}



void Layer::commitChildList() {

    for (size_t i = 0; i < mCurrentChildren.size(); i++) {

        const auto& child = mCurrentChildren[i];
@@ -1997,6 +2017,17 @@ void Layer::commitChildList() { 
    }

    mDrawingChildren = mCurrentChildren;

    mDrawingParent = mCurrentParent;

    if (CC_UNLIKELY(usingRelativeZ(LayerVector::StateSet::Drawing))) {

        auto zOrderRelativeOf = mDrawingState.zOrderRelativeOf.promote();

        if (zOrderRelativeOf == nullptr) return;

        if (findInHierarchy(zOrderRelativeOf)) {

            ALOGE("Detected Z ordering loop between %s and %s", mName.c_str(),

                  zOrderRelativeOf->mName.c_str());

            ALOGE("Severing rel Z loop, potentially dangerous");

            mDrawingState.isRelativeOf = false;

            zOrderRelativeOf->removeZOrderRelative(this);

        }

    }

}

services/surfaceflinger/Layer.h

+1 −0
Original line number Diff line number Diff line
@@ -1138,6 +1138,7 @@ private: 
    bool mIsAtRoot = false;



    uint32_t mLayerCreationFlags;

    bool findInHierarchy(const sp<Layer>&);

};



std::ostream& operator<<(std::ostream& stream, const Layer::FrameRate& rate);