Use FenceTime to share fence times and reduce open fds.
FenceTimes are created and shared for each Fence that
FrameTimestampHistory and FrameTracker care about.
On the consumer side, the FenceTimes are also added to
shared timelines that are owned by SurfaceFlinger or
unshared timelines owned by Layer. The timelines are
checked at the end of every frame to minimize the number
of file descriptors open.
On the producer side, the FenceTimes are added to
the ConsumerFrameEventHistory instead, since the timelines
that would be tracked by SurfaceFlinger are not shared
with anyone else in the consumer's process. The timelines
are checked just after a frame is queued to minimize
the number of file descriptors open.
Test: adb shell /data/nativetest/libgui_test/libgui_test
--gtest_filter=*GetFrameTimestamps*
Change-Id: Ifd4301affe1b24705b2bee7608c5a2c09dfb4041
diff --git a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h
index b435bf5..d37dc0a 100644
--- a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h
+++ b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h
@@ -136,7 +136,7 @@
static Source fbSourceForCompositionType(CompositionType type);
status_t dequeueBuffer(Source source, PixelFormat format, uint32_t usage,
int* sslot, sp<Fence>* fence);
- void updateQueueBufferOutput(const QueueBufferOutput& qbo);
+ void updateQueueBufferOutput(QueueBufferOutput&& qbo);
void resetPerFrameState();
status_t refreshOutputBuffer();
@@ -181,6 +181,8 @@
// The QueueBufferOutput with the latest info from the sink, and with the
// transform hint cleared. Since we defer queueBuffer from the GLES driver
// to the sink, we have to return the previous version.
+ // Moves instead of copies are performed to avoid duplicate
+ // FrameEventHistoryDeltas.
QueueBufferOutput mQueueBufferOutput;
// Details of the current sink buffer. These become valid when a buffer is