DO NOT MERGE Revert "DO NOT MERGE Extend mPreviousPresentFences for high refresh rate"

This reverts commit 73e9ae3.

Reason for revert: http://b/361358860

Change-Id: I7d38f19a5514ff70ea43a3533b45f3c6bf4e83c9

Author: adyabr

services/surfaceflinger/Scheduler/include/scheduler/FrameTargeter.h

@@ -106,8 +106,7 @@ class FrameTarget {
         FenceTimePtr fenceTime = FenceTime::NO_FENCE;
         TimePoint expectedPresentTime = TimePoint();
     };
-    // size should be longest sf-duration / shortest vsync period and round up
-    std::array<FenceWithFenceTime, 5> mPresentFences; // currently consider 166hz.
+    std::array<FenceWithFenceTime, 2> mPresentFences;
     utils::RingBuffer<FenceWithFenceTime, 5> mFenceWithFenceTimes;
 
     TimePoint mLastSignaledFrameTime;

services/surfaceflinger/Scheduler/src/FrameTargeter.cpp

@@ -20,20 +20,6 @@
 #include <scheduler/FrameTargeter.h>
 #include <scheduler/IVsyncSource.h>
 
-namespace {
-size_t getPresentFenceShift(Period minFramePeriod) {
-    const bool isTwoVsyncsAhead = targetsVsyncsAhead<2>(minFramePeriod);
-    size_t shift = 0;
-    if (isTwoVsyncsAhead) {
-        shift = static_cast<size_t>(expectedFrameDuration.ns() / minFramePeriod.ns());
-        if (shift >= mPresentFences.size()) {
-            shift = mPresentFences.size() - 1;
-        }
-    }
-    return shift;
-}
-} // namespace
-
 namespace android::scheduler {
 
 FrameTarget::FrameTarget(const std::string& displayLabel)
@@ -44,18 +30,16 @@ FrameTarget::FrameTarget(const std::string& displayLabel)
 
 TimePoint FrameTarget::pastVsyncTime(Period minFramePeriod) const {
     // TODO(b/267315508): Generalize to N VSYNCs.
-    const size_t shift = getPresentFenceShift(minFramePeriod);
+    const int shift = static_cast<int>(targetsVsyncsAhead<2>(minFramePeriod));
     return mExpectedPresentTime - Period::fromNs(minFramePeriod.ns() << shift);
 }
 
 FenceTimePtr FrameTarget::presentFenceForPastVsync(Period minFramePeriod) const {
     if (FlagManager::getInstance().allow_n_vsyncs_in_targeter()) {
         return pastVsyncTimePtr();
     }
-
-    const size_t shift = getPresentFenceShift(minFramePeriod);
-    ATRACE_FORMAT("mPresentFences shift=%zu", shift);
-    return mPresentFences[shift].fenceTime;
+    const size_t i = static_cast<size_t>(targetsVsyncsAhead<2>(minFramePeriod));
+    return mPresentFences[i].fenceTime;
 }
 
 bool FrameTarget::wouldPresentEarly(Period minFramePeriod) const {
@@ -167,9 +151,7 @@ FenceTimePtr FrameTargeter::setPresentFence(sp<Fence> presentFence, FenceTimePtr
     if (FlagManager::getInstance().allow_n_vsyncs_in_targeter()) {
         addFence(std::move(presentFence), presentFenceTime, mExpectedPresentTime);
     } else {
-        for (size_t i = mPreviousPresentFences.size()-1; i >= 1; i--) {
-            mPresentFences[i] = mPresentFences[i-1];
-        }
+        mPresentFences[1] = mPresentFences[0];
         mPresentFences[0] = {std::move(presentFence), presentFenceTime, mExpectedPresentTime};
     }
     return presentFenceTime;