[Mirror Layers] Added functions to update mirrored layers info (2/4)

Added updateMirrorInfo and updateBufferInfoFromClone to ensure the state
and buffer of the clones are updated properly. updateMirrorInfo is
called when commitTransaction is called to update the drawing state,
children, and relatives. updateBufferInfoFromClone is called in
handlePageFlip after the real layer calls latchBuffer to ensure the
cloned layer gets the updated buffer and buffer info.

Test: No mirror request yet so everything runs normally
Bug: 131622422
Change-Id: Ic2b1f66cab98175dbdccf90f2f8310c7f19d8cff

1 files changed, 32 insertions, 3 deletions

diff --git a/services/surfaceflinger/BufferLayer.cpp b/services/surfaceflinger/BufferLayer.cpp
index d189846dd5..b500ad3eee 100644
--- a/services/surfaceflinger/BufferLayer.cpp
+++ b/services/surfaceflinger/BufferLayer.cpp
@@ -295,7 +295,7 @@ bool BufferLayer::onPostComposition(const std::optional<DisplayId>& displayId,
                                     const CompositorTiming& compositorTiming) {
     // mFrameLatencyNeeded is true when a new frame was latched for the
     // composition.
-    if (!mFrameLatencyNeeded) return false;
+    if (!mBufferInfo.mFrameLatencyNeeded) return false;
 
     // Update mFrameEventHistory.
     {
@@ -337,7 +337,7 @@ bool BufferLayer::onPostComposition(const std::optional<DisplayId>& displayId,
     }
 
     mFrameTracker.advanceFrame();
-    mFrameLatencyNeeded = false;
+    mBufferInfo.mFrameLatencyNeeded = false;
     return true;
 }
 
@@ -401,7 +401,7 @@ bool BufferLayer::latchBuffer(bool& recomputeVisibleRegions, nsecs_t latchTime,
     gatherBufferInfo();
 
     mRefreshPending = true;
-    mFrameLatencyNeeded = true;
+    mBufferInfo.mFrameLatencyNeeded = true;
     if (oldBufferInfo.mBuffer == nullptr) {
         // the first time we receive a buffer, we need to trigger a
         // geometry invalidation.
@@ -735,6 +735,35 @@ void BufferLayer::setInitialValuesForClone(const sp<Layer>& clonedFrom) {
     mPremultipliedAlpha = bufferClonedFrom->mPremultipliedAlpha;
     mPotentialCursor = bufferClonedFrom->mPotentialCursor;
     mProtectedByApp = bufferClonedFrom->mProtectedByApp;
+
+    updateCloneBufferInfo();
+}
+
+void BufferLayer::updateCloneBufferInfo() {
+    if (!isClone() || !isClonedFromAlive()) {
+        return;
+    }
+
+    sp<BufferLayer> clonedFrom = static_cast<BufferLayer*>(getClonedFrom().get());
+    mBufferInfo = clonedFrom->mBufferInfo;
+    mSidebandStream = clonedFrom->mSidebandStream;
+    surfaceDamageRegion = clonedFrom->surfaceDamageRegion;
+    mCurrentFrameNumber = clonedFrom->mCurrentFrameNumber.load();
+    mPreviousFrameNumber = clonedFrom->mPreviousFrameNumber;
+
+    // After buffer info is updated, the drawingState from the real layer needs to be copied into
+    // the cloned. This is because some properties of drawingState can change when latchBuffer is
+    // called. However, copying the drawingState would also overwrite the cloned layer's relatives.
+    // Therefore, temporarily store the relatives so they can be set in the cloned drawingState
+    // again.
+    wp<Layer> tmpZOrderRelativeOf = mDrawingState.zOrderRelativeOf;
+    SortedVector<wp<Layer>> tmpZOrderRelatives = mDrawingState.zOrderRelatives;
+    mDrawingState = clonedFrom->mDrawingState;
+    // TODO: (b/140756730) Ignore input for now since InputDispatcher doesn't support multiple
+    // InputWindows per client token yet.
+    mDrawingState.inputInfo.token = nullptr;
+    mDrawingState.zOrderRelativeOf = tmpZOrderRelativeOf;
+    mDrawingState.zOrderRelatives = tmpZOrderRelatives;
 }
 
 } // namespace android