Account for release callbacks when determing if sync is finished
The current code only considers sync complete when BBQ receives a commit
callback for a frame that's >= to the last acquired buffer. This is
because syncs always blocked anything that wasn't a sync so it was
guaranteed that the last acquired buffer was for a sync.
However, this doesn't work if we want to handle sync buffers that are
dropped. Those transactions may never get applied and therefore the
commit callback may never occur. In those cases, we still want to
consider the sync complete if the buffer is released since it's never
going to get applied.
Test: BLASTBufferQueueTest
Bug: 233625646
Change-Id: I43be3f8bfb41ef5d57e64ca118604fbbc7a81514
diff --git a/libs/gui/tests/BLASTBufferQueue_test.cpp b/libs/gui/tests/BLASTBufferQueue_test.cpp
index cb7e94c..b993289 100644
--- a/libs/gui/tests/BLASTBufferQueue_test.cpp
+++ b/libs/gui/tests/BLASTBufferQueue_test.cpp
@@ -161,6 +161,10 @@
ASSERT_EQ(numFramesSubmitted, mBlastBufferQueueAdapter->mSubmitted.size());
}
+ void mergeWithNextTransaction(Transaction* merge, uint64_t frameNumber) {
+ mBlastBufferQueueAdapter->mergeWithNextTransaction(merge, frameNumber);
+ }
+
private:
sp<TestBLASTBufferQueue> mBlastBufferQueueAdapter;
};
@@ -1111,6 +1115,39 @@
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