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-rw-r--r--libs/gui/BLASTBufferQueue.cpp42
-rw-r--r--libs/gui/include/gui/BLASTBufferQueue.h3
-rw-r--r--libs/gui/tests/BLASTBufferQueue_test.cpp37
3 files changed, 63 insertions, 19 deletions
diff --git a/libs/gui/BLASTBufferQueue.cpp b/libs/gui/BLASTBufferQueue.cpp
index f34061492a..453bdae9cc 100644
--- a/libs/gui/BLASTBufferQueue.cpp
+++ b/libs/gui/BLASTBufferQueue.cpp
@@ -288,18 +288,17 @@ void BLASTBufferQueue::transactionCommittedCallback(nsecs_t /*latchTime*/,
// We need to check if we were waiting for a transaction callback in order to
// process any pending buffers and unblock. It's possible to get transaction
- // callbacks for previous requests so we need to ensure the frame from this
- // transaction callback matches the last acquired buffer. Since acquireNextBuffer
- // will stop processing buffers when mWaitForTransactionCallback is set, we know
- // that mLastAcquiredFrameNumber is the frame we're waiting on.
- // We also want to check if mNextTransaction is null because it's possible another
+ // callbacks for previous requests so we need to ensure that there are no pending
+ // frame numbers that were in a sync. We remove the frame from mSyncedFrameNumbers
+ // set and then check if it's empty. If there are no more pending syncs, we can
+ // proceed with flushing the shadow queue.
+ // We also want to check if mSyncTransaction is null because it's possible another
// sync request came in while waiting, but it hasn't started processing yet. In that
// case, we don't actually want to flush the frames in between since they will get
// processed and merged with the sync transaction and released earlier than if they
// were sent to SF
- if (mWaitForTransactionCallback && mSyncTransaction == nullptr &&
- currFrameNumber >= mLastAcquiredFrameNumber) {
- mWaitForTransactionCallback = false;
+ mSyncedFrameNumbers.erase(currFrameNumber);
+ if (mSyncedFrameNumbers.empty() && mSyncTransaction == nullptr) {
flushShadowQueue();
}
} else {
@@ -417,9 +416,11 @@ void BLASTBufferQueue::releaseBufferCallback(
const auto releasedBuffer = mPendingRelease.front();
mPendingRelease.pop_front();
releaseBuffer(releasedBuffer.callbackId, releasedBuffer.releaseFence);
- // Don't process the transactions here if mWaitForTransactionCallback is set. Instead, let
- // onFrameAvailable handle processing them since it will merge with the syncTransaction.
- if (!mWaitForTransactionCallback) {
+ // Don't process the transactions here if mSyncedFrameNumbers is not empty. That means
+ // are still transactions that have sync buffers in them that have not been applied or
+ // dropped. Instead, let onFrameAvailable handle processing them since it will merge with
+ // the syncTransaction.
+ if (mSyncedFrameNumbers.empty()) {
acquireNextBufferLocked(std::nullopt);
}
}
@@ -443,6 +444,9 @@ void BLASTBufferQueue::releaseBuffer(const ReleaseCallbackId& callbackId,
BQA_LOGV("released %s", callbackId.to_string().c_str());
mBufferItemConsumer->releaseBuffer(it->second, releaseFence);
mSubmitted.erase(it);
+ // Remove the frame number from mSyncedFrameNumbers since we can get a release callback
+ // without getting a transaction committed if the buffer was dropped.
+ mSyncedFrameNumbers.erase(callbackId.framenumber);
}
void BLASTBufferQueue::acquireNextBufferLocked(
@@ -609,7 +613,7 @@ void BLASTBufferQueue::acquireAndReleaseBuffer() {
}
void BLASTBufferQueue::flushAndWaitForFreeBuffer(std::unique_lock<std::mutex>& lock) {
- if (mWaitForTransactionCallback && mNumFrameAvailable > 0) {
+ if (!mSyncedFrameNumbers.empty() && mNumFrameAvailable > 0) {
// We are waiting on a previous sync's transaction callback so allow another sync
// transaction to proceed.
//
@@ -636,6 +640,8 @@ void BLASTBufferQueue::flushAndWaitForFreeBuffer(std::unique_lock<std::mutex>& l
void BLASTBufferQueue::onFrameAvailable(const BufferItem& item) {
std::function<void(SurfaceComposerClient::Transaction*)> prevCallback = nullptr;
SurfaceComposerClient::Transaction* prevTransaction = nullptr;
+ bool waitForTransactionCallback = !mSyncedFrameNumbers.empty();
+
{
BBQ_TRACE();
std::unique_lock _lock{mMutex};
@@ -667,7 +673,7 @@ void BLASTBufferQueue::onFrameAvailable(const BufferItem& item) {
// add to shadow queue
mNumFrameAvailable++;
- if (mWaitForTransactionCallback && mNumFrameAvailable >= 2) {
+ if (waitForTransactionCallback && mNumFrameAvailable >= 2) {
acquireAndReleaseBuffer();
}
ATRACE_INT(mQueuedBufferTrace.c_str(),
@@ -684,14 +690,14 @@ void BLASTBufferQueue::onFrameAvailable(const BufferItem& item) {
incStrong((void*)transactionCommittedCallbackThunk);
mSyncTransaction->addTransactionCommittedCallback(transactionCommittedCallbackThunk,
static_cast<void*>(this));
- mWaitForTransactionCallback = true;
+ mSyncedFrameNumbers.emplace(item.mFrameNumber);
if (mAcquireSingleBuffer) {
prevCallback = mTransactionReadyCallback;
prevTransaction = mSyncTransaction;
mTransactionReadyCallback = nullptr;
mSyncTransaction = nullptr;
}
- } else if (!mWaitForTransactionCallback) {
+ } else if (!waitForTransactionCallback) {
acquireNextBufferLocked(std::nullopt);
}
}
@@ -1098,9 +1104,9 @@ void BLASTBufferQueue::abandon() {
}
// Clear sync states
- if (mWaitForTransactionCallback) {
- BQA_LOGD("mWaitForTransactionCallback cleared");
- mWaitForTransactionCallback = false;
+ if (!mSyncedFrameNumbers.empty()) {
+ BQA_LOGD("mSyncedFrameNumbers cleared");
+ mSyncedFrameNumbers.clear();
}
if (mSyncTransaction != nullptr) {
diff --git a/libs/gui/include/gui/BLASTBufferQueue.h b/libs/gui/include/gui/BLASTBufferQueue.h
index 9328a54184..9d287910a5 100644
--- a/libs/gui/include/gui/BLASTBufferQueue.h
+++ b/libs/gui/include/gui/BLASTBufferQueue.h
@@ -251,7 +251,6 @@ private:
std::queue<sp<SurfaceControl>> mSurfaceControlsWithPendingCallback GUARDED_BY(mMutex);
uint32_t mCurrentMaxAcquiredBufferCount;
- bool mWaitForTransactionCallback GUARDED_BY(mMutex) = false;
// Flag to determine if syncTransaction should only acquire a single buffer and then clear or
// continue to acquire buffers until explicitly cleared
@@ -279,6 +278,8 @@ private:
uint64_t mLastAppliedFrameNumber = 0;
std::function<void(bool)> mTransactionHangCallback;
+
+ std::unordered_set<uint64_t> mSyncedFrameNumbers GUARDED_BY(mMutex);
};
} // namespace android
diff --git a/libs/gui/tests/BLASTBufferQueue_test.cpp b/libs/gui/tests/BLASTBufferQueue_test.cpp
index 3a9b2b8dcd..a071eb994d 100644
--- a/libs/gui/tests/BLASTBufferQueue_test.cpp
+++ b/libs/gui/tests/BLASTBufferQueue_test.cpp
@@ -162,6 +162,10 @@ public:
ASSERT_EQ(numFramesSubmitted, mBlastBufferQueueAdapter->mSubmitted.size());
}
+ void mergeWithNextTransaction(Transaction* merge, uint64_t frameNumber) {
+ mBlastBufferQueueAdapter->mergeWithNextTransaction(merge, frameNumber);
+ }
+
private:
sp<TestBLASTBufferQueue> mBlastBufferQueueAdapter;
};
@@ -1113,6 +1117,39 @@ TEST_F(BLASTBufferQueueTest, SyncNextTransactionOverwrite) {
ASSERT_TRUE(receivedCallback);
}
+TEST_F(BLASTBufferQueueTest, SyncNextTransactionDropBuffer) {
+ uint8_t r = 255;
+ uint8_t g = 0;
+ uint8_t b = 0;
+
+ BLASTBufferQueueHelper adapter(mSurfaceControl, mDisplayWidth, mDisplayHeight);
+
+ sp<IGraphicBufferProducer> igbProducer;
+ setUpProducer(adapter, igbProducer);
+
+ Transaction sync;
+ adapter.setSyncTransaction(sync);
+ queueBuffer(igbProducer, 0, 255, 0, 0);
+
+ // Merge a transaction that has a complete callback into the next frame so we can get notified
+ // when to take a screenshot
+ CallbackHelper transactionCallback;
+ Transaction t;
+ t.addTransactionCompletedCallback(transactionCallback.function,
+ transactionCallback.getContext());
+ adapter.mergeWithNextTransaction(&t, 2);
+ queueBuffer(igbProducer, r, g, b, 0);
+
+ // Drop the buffer, but ensure the next one continues to get processed.
+ sync.setBuffer(mSurfaceControl, nullptr);
+
+ CallbackData callbackData;
+ transactionCallback.getCallbackData(&callbackData);
+ ASSERT_EQ(NO_ERROR, captureDisplay(mCaptureArgs, mCaptureResults));
+ ASSERT_NO_FATAL_FAILURE(
+ checkScreenCapture(r, g, b, {0, 0, (int32_t)mDisplayWidth, (int32_t)mDisplayHeight}));
+}
+
// This test will currently fail because the old surfacecontrol will steal the last presented buffer
// until the old surface control is destroyed. This is not necessarily a bug but to document a
// limitation with the update API and to test any changes to make the api more robust. The current
generated by cgit v1.2.3-59-g8ed1b (git 2.39.0) at 2025-12-11 14:31:26 +0000