SF: give a higher score to frame rates which exact matches
To avoid cases where devices with very close refresh rates
(such as 53Hz and 55Hz) gives the same score for these,
assign a small (0.99) factor to frame rate that are
not exact match of a multiple of the refresh rate
Test: atest FrameRateCtsActivity
Test: atest RefreshRateConfigsTest
Bug: 190578904
Change-Id: Idd32600ccacc0cad8f44c9d9373e50a333663717
diff --git a/services/surfaceflinger/Scheduler/RefreshRateConfigs.cpp b/services/surfaceflinger/Scheduler/RefreshRateConfigs.cpp
index e922d46..f72fb15 100644
--- a/services/surfaceflinger/Scheduler/RefreshRateConfigs.cpp
+++ b/services/surfaceflinger/Scheduler/RefreshRateConfigs.cpp
@@ -133,27 +133,10 @@
return true;
}
-float RefreshRateConfigs::calculateLayerScoreLocked(const LayerRequirement& layer,
- const RefreshRate& refreshRate,
- bool isSeamlessSwitch) const {
- if (!isVoteAllowed(layer, refreshRate)) {
- return 0;
- }
-
+float RefreshRateConfigs::calculateNonExactMatchingLayerScoreLocked(
+ const LayerRequirement& layer, const RefreshRate& refreshRate) const {
constexpr float kScoreForFractionalPairs = .8f;
- // Slightly prefer seamless switches.
- constexpr float kSeamedSwitchPenalty = 0.95f;
- const float seamlessness = isSeamlessSwitch ? 1.0f : kSeamedSwitchPenalty;
-
- // If the layer wants Max, give higher score to the higher refresh rate
- if (layer.vote == LayerVoteType::Max) {
- const auto ratio = refreshRate.getFps().getValue() /
- mAppRequestRefreshRates.back()->getFps().getValue();
- // use ratio^2 to get a lower score the more we get further from peak
- return ratio * ratio;
- }
-
const auto displayPeriod = refreshRate.getVsyncPeriod();
const auto layerPeriod = layer.desiredRefreshRate.getPeriodNsecs();
if (layer.vote == LayerVoteType::ExplicitDefault) {
@@ -178,7 +161,7 @@
if (layer.vote == LayerVoteType::ExplicitExactOrMultiple ||
layer.vote == LayerVoteType::Heuristic) {
if (isFractionalPairOrMultiple(refreshRate.getFps(), layer.desiredRefreshRate)) {
- return kScoreForFractionalPairs * seamlessness;
+ return kScoreForFractionalPairs;
}
// Calculate how many display vsyncs we need to present a single frame for this
@@ -188,7 +171,7 @@
static constexpr size_t MAX_FRAMES_TO_FIT = 10; // Stop calculating when score < 0.1
if (displayFramesRemainder == 0) {
// Layer desired refresh rate matches the display rate.
- return 1.0f * seamlessness;
+ return 1.0f;
}
if (displayFramesQuotient == 0) {
@@ -206,7 +189,29 @@
iter++;
}
- return (1.0f / iter) * seamlessness;
+ return (1.0f / iter);
+ }
+
+ return 0;
+}
+
+float RefreshRateConfigs::calculateLayerScoreLocked(const LayerRequirement& layer,
+ const RefreshRate& refreshRate,
+ bool isSeamlessSwitch) const {
+ if (!isVoteAllowed(layer, refreshRate)) {
+ return 0;
+ }
+
+ // Slightly prefer seamless switches.
+ constexpr float kSeamedSwitchPenalty = 0.95f;
+ const float seamlessness = isSeamlessSwitch ? 1.0f : kSeamedSwitchPenalty;
+
+ // If the layer wants Max, give higher score to the higher refresh rate
+ if (layer.vote == LayerVoteType::Max) {
+ const auto ratio = refreshRate.getFps().getValue() /
+ mAppRequestRefreshRates.back()->getFps().getValue();
+ // use ratio^2 to get a lower score the more we get further from peak
+ return ratio * ratio;
}
if (layer.vote == LayerVoteType::ExplicitExact) {
@@ -221,7 +226,18 @@
return divider == 1;
}
- return 0;
+ // If the layer frame rate is a divider of the refresh rate it should score
+ // the highest score.
+ if (getFrameRateDivider(refreshRate.getFps(), layer.desiredRefreshRate) > 0) {
+ return 1.0f * seamlessness;
+ }
+
+ // The layer frame rate is not a divider of the refresh rate,
+ // there is a small penalty attached to the score to favor the frame rates
+ // the exactly matches the display refresh rate or a multiple.
+ constexpr float kNonExactMatchingPenalty = 0.99f;
+ return calculateNonExactMatchingLayerScoreLocked(layer, refreshRate) * seamlessness *
+ kNonExactMatchingPenalty;
}
struct RefreshRateScore {
diff --git a/services/surfaceflinger/Scheduler/RefreshRateConfigs.h b/services/surfaceflinger/Scheduler/RefreshRateConfigs.h
index 0d75689..8b895f5 100644
--- a/services/surfaceflinger/Scheduler/RefreshRateConfigs.h
+++ b/services/surfaceflinger/Scheduler/RefreshRateConfigs.h
@@ -405,6 +405,9 @@
float calculateLayerScoreLocked(const LayerRequirement&, const RefreshRate&,
bool isSeamlessSwitch) const REQUIRES(mLock);
+ float calculateNonExactMatchingLayerScoreLocked(const LayerRequirement&,
+ const RefreshRate&) const REQUIRES(mLock);
+
void updateDisplayModes(const DisplayModes& mode, DisplayModeId currentModeId) EXCLUDES(mLock);
// The list of refresh rates, indexed by display modes ID. This may change after this
diff --git a/services/surfaceflinger/tests/unittests/RefreshRateConfigsTest.cpp b/services/surfaceflinger/tests/unittests/RefreshRateConfigsTest.cpp
index a6bfde7..4681c37 100644
--- a/services/surfaceflinger/tests/unittests/RefreshRateConfigsTest.cpp
+++ b/services/surfaceflinger/tests/unittests/RefreshRateConfigsTest.cpp
@@ -175,7 +175,6 @@
RefreshRate mExpected30Config = {mConfig30, RefreshRate::ConstructorTag(0)};
RefreshRate mExpected120Config = {mConfig120, RefreshRate::ConstructorTag(0)};
-private:
DisplayModePtr createDisplayMode(DisplayModeId modeId, int32_t group, int64_t vsyncPeriod,
ui::Size resolution = ui::Size());
};
@@ -2170,6 +2169,44 @@
refreshRateConfigs->getBestRefreshRate(layers, {.touch = false, .idle = false}));
}
+// b/190578904
+TEST_F(RefreshRateConfigsTest, getBestRefreshRate_deviceWithCloseRefreshRates) {
+ constexpr int kMinRefreshRate = 10;
+ constexpr int kMaxRefreshRate = 240;
+
+ DisplayModes displayModes;
+ for (int fps = kMinRefreshRate; fps < kMaxRefreshRate; fps++) {
+ constexpr int32_t kGroup = 0;
+ const auto refreshRate = Fps(static_cast<float>(fps));
+ displayModes.push_back(
+ createDisplayMode(DisplayModeId(fps), kGroup, refreshRate.getPeriodNsecs()));
+ }
+
+ const RefreshRateConfigs::GlobalSignals globalSignals = {.touch = false, .idle = false};
+ auto refreshRateConfigs =
+ std::make_unique<RefreshRateConfigs>(displayModes,
+ /*currentConfigId=*/displayModes[0]->getId());
+
+ auto layers = std::vector<LayerRequirement>{LayerRequirement{.weight = 1.0f}};
+ const auto testRefreshRate = [&](Fps fps, LayerVoteType vote) {
+ layers[0].desiredRefreshRate = fps;
+ layers[0].vote = vote;
+ EXPECT_EQ(fps.getIntValue(),
+ refreshRateConfigs->getBestRefreshRate(layers, globalSignals)
+ .getFps()
+ .getIntValue())
+ << "Failed for " << RefreshRateConfigs::layerVoteTypeString(vote);
+ };
+
+ for (int fps = kMinRefreshRate; fps < kMaxRefreshRate; fps++) {
+ const auto refreshRate = Fps(static_cast<float>(fps));
+ testRefreshRate(refreshRate, LayerVoteType::Heuristic);
+ testRefreshRate(refreshRate, LayerVoteType::ExplicitDefault);
+ testRefreshRate(refreshRate, LayerVoteType::ExplicitExactOrMultiple);
+ testRefreshRate(refreshRate, LayerVoteType::ExplicitExact);
+ }
+}
+
TEST_F(RefreshRateConfigsTest, testComparisonOperator) {
EXPECT_TRUE(mExpected60Config < mExpected90Config);
EXPECT_FALSE(mExpected60Config < mExpected60Config);