Merge "SurfaceFlinger: calculate expected present once" into qt-r1-dev
diff --git a/libs/gui/Android.bp b/libs/gui/Android.bp
index 34575f5..e3e63ee 100644
--- a/libs/gui/Android.bp
+++ b/libs/gui/Android.bp
@@ -34,6 +34,7 @@
         "BufferItemConsumer.cpp",
         "ConsumerBase.cpp",
         "CpuConsumer.cpp",
+        "DebugEGLImageTracker.cpp",
         "DisplayEventReceiver.cpp",
         "GLConsumer.cpp",
         "GuiConfig.cpp",
diff --git a/libs/gui/DebugEGLImageTracker.cpp b/libs/gui/DebugEGLImageTracker.cpp
new file mode 100644
index 0000000..ab6f364
--- /dev/null
+++ b/libs/gui/DebugEGLImageTracker.cpp
@@ -0,0 +1,98 @@
+/*
+ * Copyright 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <android-base/stringprintf.h>
+#include <cutils/properties.h>
+#include <gui/DebugEGLImageTracker.h>
+
+#include <cinttypes>
+#include <unordered_map>
+
+using android::base::StringAppendF;
+
+std::mutex DebugEGLImageTracker::mInstanceLock;
+std::atomic<DebugEGLImageTracker *> DebugEGLImageTracker::mInstance;
+
+class DebugEGLImageTrackerNoOp : public DebugEGLImageTracker {
+public:
+    DebugEGLImageTrackerNoOp() = default;
+    ~DebugEGLImageTrackerNoOp() override = default;
+    void create(const char * /*from*/) override {}
+    void destroy(const char * /*from*/) override {}
+
+    void dump(std::string & /*result*/) override {}
+};
+
+class DebugEGLImageTrackerImpl : public DebugEGLImageTracker {
+public:
+    DebugEGLImageTrackerImpl() = default;
+    ~DebugEGLImageTrackerImpl() override = default;
+    void create(const char * /*from*/) override;
+    void destroy(const char * /*from*/) override;
+
+    void dump(std::string & /*result*/) override;
+
+private:
+    std::mutex mLock;
+    std::unordered_map<std::string, int64_t> mCreateTracker;
+    std::unordered_map<std::string, int64_t> mDestroyTracker;
+
+    int64_t mTotalCreated = 0;
+    int64_t mTotalDestroyed = 0;
+};
+
+DebugEGLImageTracker *DebugEGLImageTracker::getInstance() {
+    std::lock_guard lock(mInstanceLock);
+    if (mInstance == nullptr) {
+        char value[PROPERTY_VALUE_MAX];
+        property_get("debug.sf.enable_egl_image_tracker", value, "0");
+        const bool enabled = static_cast<bool>(atoi(value));
+
+        if (enabled) {
+            mInstance = new DebugEGLImageTrackerImpl();
+        } else {
+            mInstance = new DebugEGLImageTrackerNoOp();
+        }
+    }
+
+    return mInstance;
+}
+
+void DebugEGLImageTrackerImpl::create(const char *from) {
+    std::lock_guard lock(mLock);
+    mCreateTracker[from]++;
+    mTotalCreated++;
+}
+
+void DebugEGLImageTrackerImpl::destroy(const char *from) {
+    std::lock_guard lock(mLock);
+    mDestroyTracker[from]++;
+    mTotalDestroyed++;
+}
+
+void DebugEGLImageTrackerImpl::dump(std::string &result) {
+    std::lock_guard lock(mLock);
+    StringAppendF(&result, "Live EGL Image objects: %" PRIi64 "\n",
+                  mTotalCreated - mTotalDestroyed);
+    StringAppendF(&result, "Total EGL Image created: %" PRIi64 "\n", mTotalCreated);
+    for (const auto &[from, count] : mCreateTracker) {
+        StringAppendF(&result, "\t%s: %" PRIi64 "\n", from.c_str(), count);
+    }
+    StringAppendF(&result, "Total EGL Image destroyed: %" PRIi64 "\n", mTotalDestroyed);
+    for (const auto &[from, count] : mDestroyTracker) {
+        StringAppendF(&result, "\t%s: %" PRIi64 "\n", from.c_str(), count);
+    }
+}
diff --git a/libs/gui/GLConsumer.cpp b/libs/gui/GLConsumer.cpp
index 8d66154..8199c98 100644
--- a/libs/gui/GLConsumer.cpp
+++ b/libs/gui/GLConsumer.cpp
@@ -34,6 +34,7 @@
 #include <math/mat4.h>
 
 #include <gui/BufferItem.h>
+#include <gui/DebugEGLImageTracker.h>
 #include <gui/GLConsumer.h>
 #include <gui/ISurfaceComposer.h>
 #include <gui/SurfaceComposerClient.h>
@@ -944,6 +945,7 @@
         if (!eglDestroyImageKHR(mEglDisplay, mEglImage)) {
            ALOGE("~EglImage: eglDestroyImageKHR failed");
         }
+        DEBUG_EGL_IMAGE_TRACKER_DESTROY();
         eglTerminate(mEglDisplay);
     }
 }
@@ -957,6 +959,7 @@
         if (!eglDestroyImageKHR(mEglDisplay, mEglImage)) {
            ALOGE("createIfNeeded: eglDestroyImageKHR failed");
         }
+        DEBUG_EGL_IMAGE_TRACKER_DESTROY();
         eglTerminate(mEglDisplay);
         mEglImage = EGL_NO_IMAGE_KHR;
         mEglDisplay = EGL_NO_DISPLAY;
@@ -1006,7 +1009,10 @@
         EGLint error = eglGetError();
         ALOGE("error creating EGLImage: %#x", error);
         eglTerminate(dpy);
+    } else {
+        DEBUG_EGL_IMAGE_TRACKER_CREATE();
     }
+
     return image;
 }
 
diff --git a/libs/gui/include/gui/DebugEGLImageTracker.h b/libs/gui/include/gui/DebugEGLImageTracker.h
new file mode 100644
index 0000000..5d369c9
--- /dev/null
+++ b/libs/gui/include/gui/DebugEGLImageTracker.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <atomic>
+#include <mutex>
+#include <string>
+
+class DebugEGLImageTracker {
+public:
+    static DebugEGLImageTracker *getInstance();
+
+    virtual void create(const char *from) = 0;
+    virtual void destroy(const char *from) = 0;
+
+    virtual void dump(std::string &result) = 0;
+
+protected:
+    DebugEGLImageTracker() = default;
+    virtual ~DebugEGLImageTracker() = default;
+    DebugEGLImageTracker(const DebugEGLImageTracker &) = delete;
+
+    static std::mutex mInstanceLock;
+    static std::atomic<DebugEGLImageTracker *> mInstance;
+};
+
+#define DEBUG_EGL_IMAGE_TRACKER_CREATE() \
+    (DebugEGLImageTracker::getInstance()->create(__PRETTY_FUNCTION__))
+#define DEBUG_EGL_IMAGE_TRACKER_DESTROY() \
+    (DebugEGLImageTracker::getInstance()->destroy(__PRETTY_FUNCTION__))
\ No newline at end of file
diff --git a/libs/renderengine/gl/GLESRenderEngine.cpp b/libs/renderengine/gl/GLESRenderEngine.cpp
index dd12b55..7caaef3 100644
--- a/libs/renderengine/gl/GLESRenderEngine.cpp
+++ b/libs/renderengine/gl/GLESRenderEngine.cpp
@@ -31,6 +31,7 @@
 #include <android-base/stringprintf.h>
 #include <cutils/compiler.h>
 #include <cutils/properties.h>
+#include <gui/DebugEGLImageTracker.h>
 #include <renderengine/Mesh.h>
 #include <renderengine/Texture.h>
 #include <renderengine/private/Description.h>
@@ -433,6 +434,7 @@
         EGLImageKHR expired = mFramebufferImageCache.front().second;
         mFramebufferImageCache.pop_front();
         eglDestroyImageKHR(mEGLDisplay, expired);
+        DEBUG_EGL_IMAGE_TRACKER_DESTROY();
     }
     mImageCache.clear();
     eglMakeCurrent(mEGLDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
@@ -846,6 +848,7 @@
                                                              bool useFramebufferCache) {
     sp<GraphicBuffer> graphicBuffer = GraphicBuffer::from(nativeBuffer);
     if (useFramebufferCache) {
+        std::lock_guard<std::mutex> lock(mFramebufferImageCacheMutex);
         for (const auto& image : mFramebufferImageCache) {
             if (image.first == graphicBuffer->getId()) {
                 return image.second;
@@ -861,14 +864,20 @@
                                           nativeBuffer, attributes);
     if (useFramebufferCache) {
         if (image != EGL_NO_IMAGE_KHR) {
+            std::lock_guard<std::mutex> lock(mFramebufferImageCacheMutex);
             if (mFramebufferImageCache.size() >= mFramebufferImageCacheSize) {
                 EGLImageKHR expired = mFramebufferImageCache.front().second;
                 mFramebufferImageCache.pop_front();
                 eglDestroyImageKHR(mEGLDisplay, expired);
+                DEBUG_EGL_IMAGE_TRACKER_DESTROY();
             }
             mFramebufferImageCache.push_back({graphicBuffer->getId(), image});
         }
     }
+
+    if (image != EGL_NO_IMAGE_KHR) {
+        DEBUG_EGL_IMAGE_TRACKER_CREATE();
+    }
     return image;
 }
 
@@ -1306,6 +1315,23 @@
     StringAppendF(&result, "RenderEngine last dataspace conversion: (%s) to (%s)\n",
                   dataspaceDetails(static_cast<android_dataspace>(mDataSpace)).c_str(),
                   dataspaceDetails(static_cast<android_dataspace>(mOutputDataSpace)).c_str());
+    {
+        std::lock_guard<std::mutex> lock(mRenderingMutex);
+        StringAppendF(&result, "RenderEngine image cache size: %zu\n", mImageCache.size());
+        StringAppendF(&result, "Dumping buffer ids...\n");
+        for (const auto& [id, unused] : mImageCache) {
+            StringAppendF(&result, "0x%" PRIx64 "\n", id);
+        }
+    }
+    {
+        std::lock_guard<std::mutex> lock(mFramebufferImageCacheMutex);
+        StringAppendF(&result, "RenderEngine framebuffer image cache size: %zu\n",
+                      mFramebufferImageCache.size());
+        StringAppendF(&result, "Dumping buffer ids...\n");
+        for (const auto& [id, unused] : mFramebufferImageCache) {
+            StringAppendF(&result, "0x%" PRIx64 "\n", id);
+        }
+    }
 }
 
 GLESRenderEngine::GlesVersion GLESRenderEngine::parseGlesVersion(const char* str) {
@@ -1432,7 +1458,7 @@
 }
 
 bool GLESRenderEngine::isFramebufferImageCachedForTesting(uint64_t bufferId) {
-    std::lock_guard<std::mutex> lock(mRenderingMutex);
+    std::lock_guard<std::mutex> lock(mFramebufferImageCacheMutex);
     return std::any_of(mFramebufferImageCache.cbegin(), mFramebufferImageCache.cend(),
                        [=](std::pair<uint64_t, EGLImageKHR> image) {
                            return image.first == bufferId;
diff --git a/libs/renderengine/gl/GLESRenderEngine.h b/libs/renderengine/gl/GLESRenderEngine.h
index d6eab6c..a011620 100644
--- a/libs/renderengine/gl/GLESRenderEngine.h
+++ b/libs/renderengine/gl/GLESRenderEngine.h
@@ -92,17 +92,20 @@
     EGLConfig getEGLConfig() const { return mEGLConfig; }
     // Creates an output image for rendering to
     EGLImageKHR createFramebufferImageIfNeeded(ANativeWindowBuffer* nativeBuffer, bool isProtected,
-                                               bool useFramebufferCache);
+                                               bool useFramebufferCache)
+            EXCLUDES(mFramebufferImageCacheMutex);
 
     // Test-only methods
     // Returns true iff mImageCache contains an image keyed by bufferId
     bool isImageCachedForTesting(uint64_t bufferId) EXCLUDES(mRenderingMutex);
     // Returns true iff mFramebufferImageCache contains an image keyed by bufferId
-    bool isFramebufferImageCachedForTesting(uint64_t bufferId) EXCLUDES(mRenderingMutex);
+    bool isFramebufferImageCachedForTesting(uint64_t bufferId)
+            EXCLUDES(mFramebufferImageCacheMutex);
 
 protected:
     Framebuffer* getFramebufferForDrawing() override;
-    void dump(std::string& result) override;
+    void dump(std::string& result) override EXCLUDES(mRenderingMutex)
+            EXCLUDES(mFramebufferImageCacheMutex);
     void setViewportAndProjection(size_t vpw, size_t vph, Rect sourceCrop,
                                   ui::Transform::orientation_flags rotation) override;
     void setupLayerBlending(bool premultipliedAlpha, bool opaque, bool disableTexture,
@@ -199,7 +202,11 @@
     uint32_t mFramebufferImageCacheSize = 0;
 
     // Cache of output images, keyed by corresponding GraphicBuffer ID.
-    std::deque<std::pair<uint64_t, EGLImageKHR>> mFramebufferImageCache;
+    std::deque<std::pair<uint64_t, EGLImageKHR>> mFramebufferImageCache
+            GUARDED_BY(mFramebufferImageCacheMutex);
+    // The only reason why we have this mutex is so that we don't segfault when
+    // dumping info.
+    std::mutex mFramebufferImageCacheMutex;
 
     // Current dataspace of layer being rendered
     ui::Dataspace mDataSpace = ui::Dataspace::UNKNOWN;
diff --git a/libs/renderengine/gl/GLFramebuffer.cpp b/libs/renderengine/gl/GLFramebuffer.cpp
index dacf8d3..5fbb5ba 100644
--- a/libs/renderengine/gl/GLFramebuffer.cpp
+++ b/libs/renderengine/gl/GLFramebuffer.cpp
@@ -22,6 +22,7 @@
 #include <GLES/glext.h>
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
+#include <gui/DebugEGLImageTracker.h>
 #include <nativebase/nativebase.h>
 #include <utils/Trace.h>
 #include "GLESRenderEngine.h"
@@ -47,6 +48,7 @@
     if (mEGLImage != EGL_NO_IMAGE_KHR) {
         if (!usingFramebufferCache) {
             eglDestroyImageKHR(mEGLDisplay, mEGLImage);
+            DEBUG_EGL_IMAGE_TRACKER_DESTROY();
         }
         mEGLImage = EGL_NO_IMAGE_KHR;
         mBufferWidth = 0;
diff --git a/libs/renderengine/gl/GLImage.cpp b/libs/renderengine/gl/GLImage.cpp
index 77e648e..8497721 100644
--- a/libs/renderengine/gl/GLImage.cpp
+++ b/libs/renderengine/gl/GLImage.cpp
@@ -20,6 +20,7 @@
 
 #include <vector>
 
+#include <gui/DebugEGLImageTracker.h>
 #include <log/log.h>
 #include <utils/Trace.h>
 #include "GLESRenderEngine.h"
@@ -58,6 +59,7 @@
         if (!eglDestroyImageKHR(mEGLDisplay, mEGLImage)) {
             ALOGE("failed to destroy image: %#x", eglGetError());
         }
+        DEBUG_EGL_IMAGE_TRACKER_DESTROY();
         mEGLImage = EGL_NO_IMAGE_KHR;
     }
 
@@ -69,6 +71,7 @@
             ALOGE("failed to create EGLImage: %#x", eglGetError());
             return false;
         }
+        DEBUG_EGL_IMAGE_TRACKER_CREATE();
         mProtected = isProtected;
     }
 
diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index 1318bc0..d6e86eb 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -2037,6 +2037,13 @@
     return mRemovedFromCurrentState;
 }
 
+// Debug helper for b/137560795
+#define INT32_MIGHT_OVERFLOW(n) (((n) >= INT32_MAX / 2) || ((n) <= INT32_MIN / 2))
+
+#define RECT_BOUNDS_INVALID(rect)                                               \
+    (INT32_MIGHT_OVERFLOW((rect).left) || INT32_MIGHT_OVERFLOW((rect).right) || \
+     INT32_MIGHT_OVERFLOW((rect).bottom) || INT32_MIGHT_OVERFLOW((rect).top))
+
 InputWindowInfo Layer::fillInputInfo() {
     InputWindowInfo info = mDrawingState.inputInfo;
 
@@ -2066,6 +2073,26 @@
         layerBounds = getCroppedBufferSize(getDrawingState());
     }
     layerBounds = t.transform(layerBounds);
+
+    // debug check for b/137560795
+    {
+        if (RECT_BOUNDS_INVALID(layerBounds)) {
+            ALOGE("layer %s bounds are invalid (%" PRIi32 ", %" PRIi32 ", %" PRIi32 ", %" PRIi32
+                  ")",
+                  mName.c_str(), layerBounds.left, layerBounds.top, layerBounds.right,
+                  layerBounds.bottom);
+            std::string out;
+            getTransform().dump(out, "Transform");
+            ALOGE("%s", out.c_str());
+            layerBounds.left = layerBounds.top = layerBounds.right = layerBounds.bottom = 0;
+        }
+
+        if (INT32_MIGHT_OVERFLOW(xSurfaceInset) || INT32_MIGHT_OVERFLOW(ySurfaceInset)) {
+            ALOGE("layer %s surface inset are invalid (%" PRIi32 ", %" PRIi32 ")", mName.c_str(),
+                  int32_t(xSurfaceInset), int32_t(ySurfaceInset));
+            xSurfaceInset = ySurfaceInset = 0;
+        }
+    }
     layerBounds.inset(xSurfaceInset, ySurfaceInset, xSurfaceInset, ySurfaceInset);
 
     // Input coordinate should match the layer bounds.
diff --git a/services/surfaceflinger/Scheduler/DispSync.cpp b/services/surfaceflinger/Scheduler/DispSync.cpp
index 83fd42b..0c94052 100644
--- a/services/surfaceflinger/Scheduler/DispSync.cpp
+++ b/services/surfaceflinger/Scheduler/DispSync.cpp
@@ -668,7 +668,13 @@
         nsecs_t durationSum = 0;
         nsecs_t minDuration = INT64_MAX;
         nsecs_t maxDuration = 0;
-        for (size_t i = 1; i < mNumResyncSamples; i++) {
+        // We skip the first 2 samples because the first vsync duration on some
+        // devices may be much more inaccurate than on other devices, e.g. due
+        // to delays in ramping up from a power collapse. By doing so this
+        // actually increases the accuracy of the DispSync model even though
+        // we're effectively relying on fewer sample points.
+        static constexpr size_t numSamplesSkipped = 2;
+        for (size_t i = numSamplesSkipped; i < mNumResyncSamples; i++) {
             size_t idx = (mFirstResyncSample + i) % MAX_RESYNC_SAMPLES;
             size_t prev = (idx + MAX_RESYNC_SAMPLES - 1) % MAX_RESYNC_SAMPLES;
             nsecs_t duration = mResyncSamples[idx] - mResyncSamples[prev];
@@ -679,15 +685,14 @@
 
         // Exclude the min and max from the average
         durationSum -= minDuration + maxDuration;
-        mPeriod = durationSum / (mNumResyncSamples - 3);
+        mPeriod = durationSum / (mNumResyncSamples - numSamplesSkipped - 2);
 
         ALOGV("[%s] mPeriod = %" PRId64, mName, ns2us(mPeriod));
 
         double sampleAvgX = 0;
         double sampleAvgY = 0;
         double scale = 2.0 * M_PI / double(mPeriod);
-        // Intentionally skip the first sample
-        for (size_t i = 1; i < mNumResyncSamples; i++) {
+        for (size_t i = numSamplesSkipped; i < mNumResyncSamples; i++) {
             size_t idx = (mFirstResyncSample + i) % MAX_RESYNC_SAMPLES;
             nsecs_t sample = mResyncSamples[idx] - mReferenceTime;
             double samplePhase = double(sample % mPeriod) * scale;
@@ -695,8 +700,8 @@
             sampleAvgY += sin(samplePhase);
         }
 
-        sampleAvgX /= double(mNumResyncSamples - 1);
-        sampleAvgY /= double(mNumResyncSamples - 1);
+        sampleAvgX /= double(mNumResyncSamples - numSamplesSkipped);
+        sampleAvgY /= double(mNumResyncSamples - numSamplesSkipped);
 
         mPhase = nsecs_t(atan2(sampleAvgY, sampleAvgX) / scale);
 
diff --git a/services/surfaceflinger/Scheduler/LayerInfo.h b/services/surfaceflinger/Scheduler/LayerInfo.h
index 66df9dc..a733781 100644
--- a/services/surfaceflinger/Scheduler/LayerInfo.h
+++ b/services/surfaceflinger/Scheduler/LayerInfo.h
@@ -129,8 +129,8 @@
 
     private:
         std::deque<nsecs_t> mElements;
-        static constexpr size_t HISTORY_SIZE = 10;
-        static constexpr std::chrono::nanoseconds HISTORY_TIME = 500ms;
+        static constexpr size_t HISTORY_SIZE = 90;
+        static constexpr std::chrono::nanoseconds HISTORY_TIME = 1s;
     };
 
 public:
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 56cccfb..f4e1ec8 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -48,6 +48,8 @@
 #include <compositionengine/impl/OutputLayerCompositionState.h>
 #include <dvr/vr_flinger.h>
 #include <gui/BufferQueue.h>
+#include <gui/DebugEGLImageTracker.h>
+
 #include <gui/GuiConfig.h>
 #include <gui/IDisplayEventConnection.h>
 #include <gui/IProducerListener.h>
@@ -5026,6 +5028,8 @@
 
     getRenderEngine().dump(result);
 
+    DebugEGLImageTracker::getInstance()->dump(result);
+
     if (const auto display = getDefaultDisplayDeviceLocked()) {
         display->getCompositionDisplay()->getState().undefinedRegion.dump(result,
                                                                           "undefinedRegion");
diff --git a/services/surfaceflinger/tests/unittests/LayerHistoryTest.cpp b/services/surfaceflinger/tests/unittests/LayerHistoryTest.cpp
index 7ec9066..8e7440c 100644
--- a/services/surfaceflinger/tests/unittests/LayerHistoryTest.cpp
+++ b/services/surfaceflinger/tests/unittests/LayerHistoryTest.cpp
@@ -27,6 +27,15 @@
 
     static constexpr float MIN_REFRESH_RATE = 30.f;
     static constexpr float MAX_REFRESH_RATE = 90.f;
+    static constexpr auto RELEVANT_FRAME_THRESHOLD = 90u;
+    static constexpr uint64_t THIRTY_FPS_INTERVAL = 33'333'333;
+
+    void forceRelevancy(const std::unique_ptr<LayerHistory::LayerHandle>& testLayer) {
+        mLayerHistory->setVisibility(testLayer, true);
+        for (auto i = 0u; i < RELEVANT_FRAME_THRESHOLD; i++) {
+            mLayerHistory->insert(testLayer, 0, false /*isHDR*/);
+        }
+    };
 };
 
 LayerHistoryTest::LayerHistoryTest() {
@@ -39,24 +48,18 @@
     std::unique_ptr<LayerHistory::LayerHandle> testLayer =
             mLayerHistory->createLayer("TestLayer", MIN_REFRESH_RATE, MAX_REFRESH_RATE);
     mLayerHistory->setVisibility(testLayer, true);
+    for (auto i = 0u; i < RELEVANT_FRAME_THRESHOLD; i++) {
+        EXPECT_FLOAT_EQ(0.f, mLayerHistory->getDesiredRefreshRateAndHDR().first);
+        mLayerHistory->insert(testLayer, 0, false /*isHDR*/);
+    }
 
-    mLayerHistory->insert(testLayer, 0, false /*isHDR*/);
-    EXPECT_FLOAT_EQ(0.f, mLayerHistory->getDesiredRefreshRateAndHDR().first);
-
-    mLayerHistory->insert(testLayer, 0, false /*isHDR*/);
-    mLayerHistory->insert(testLayer, 0, false /*isHDR*/);
-    mLayerHistory->insert(testLayer, 0, false /*isHDR*/);
-    // This is still 0, because the layer is not considered recently active if it
-    // has been present in less than 10 frames.
-    EXPECT_FLOAT_EQ(0.f, mLayerHistory->getDesiredRefreshRateAndHDR().first);
-    mLayerHistory->insert(testLayer, 0, false /*isHDR*/);
-    mLayerHistory->insert(testLayer, 0, false /*isHDR*/);
-    mLayerHistory->insert(testLayer, 0, false /*isHDR*/);
-    mLayerHistory->insert(testLayer, 0, false /*isHDR*/);
-    mLayerHistory->insert(testLayer, 0, false /*isHDR*/);
-    mLayerHistory->insert(testLayer, 0, false /*isHDR*/);
-    // This should be MAX_REFRESH_RATE as we have more than 10 samples
-    EXPECT_FLOAT_EQ(MAX_REFRESH_RATE, mLayerHistory->getDesiredRefreshRateAndHDR().first);
+    // Add a few more. This time we should get MAX refresh rate as the layer
+    // becomes relevant
+    static constexpr auto A_FEW = 10;
+    for (auto i = 0u; i < A_FEW; i++) {
+        EXPECT_FLOAT_EQ(MAX_REFRESH_RATE, mLayerHistory->getDesiredRefreshRateAndHDR().first);
+        mLayerHistory->insert(testLayer, 0, false /*isHDR*/);
+    }
 }
 
 TEST_F(LayerHistoryTest, oneHDRLayer) {
@@ -79,8 +82,9 @@
     mLayerHistory->setVisibility(test30FpsLayer, true);
 
     nsecs_t startTime = systemTime();
-    for (int i = 0; i < 31; i++) {
-        mLayerHistory->insert(test30FpsLayer, startTime + (i * 33333333), false /*isHDR*/);
+    for (int i = 0; i < RELEVANT_FRAME_THRESHOLD; i++) {
+        mLayerHistory->insert(test30FpsLayer, startTime + (i * THIRTY_FPS_INTERVAL),
+                              false /*isHDR*/);
     }
 
     EXPECT_FLOAT_EQ(30.f, mLayerHistory->getDesiredRefreshRateAndHDR().first);
@@ -98,19 +102,21 @@
     mLayerHistory->setVisibility(testLayer2, true);
 
     nsecs_t startTime = systemTime();
-    for (int i = 0; i < 10; i++) {
+    for (int i = 0; i < RELEVANT_FRAME_THRESHOLD; i++) {
         mLayerHistory->insert(testLayer, 0, false /*isHDR*/);
     }
     EXPECT_FLOAT_EQ(MAX_REFRESH_RATE, mLayerHistory->getDesiredRefreshRateAndHDR().first);
 
     startTime = systemTime();
-    for (int i = 0; i < 10; i++) {
-        mLayerHistory->insert(test30FpsLayer, startTime + (i * 33333333), false /*isHDR*/);
+    for (int i = 0; i < RELEVANT_FRAME_THRESHOLD; i++) {
+        mLayerHistory->insert(test30FpsLayer, startTime + (i * THIRTY_FPS_INTERVAL),
+                              false /*isHDR*/);
     }
     EXPECT_FLOAT_EQ(MAX_REFRESH_RATE, mLayerHistory->getDesiredRefreshRateAndHDR().first);
 
-    for (int i = 10; i < 30; i++) {
-        mLayerHistory->insert(test30FpsLayer, startTime + (i * 33333333), false /*isHDR*/);
+    for (int i = 10; i < RELEVANT_FRAME_THRESHOLD; i++) {
+        mLayerHistory->insert(test30FpsLayer, startTime + (i * THIRTY_FPS_INTERVAL),
+                              false /*isHDR*/);
     }
     EXPECT_FLOAT_EQ(MAX_REFRESH_RATE, mLayerHistory->getDesiredRefreshRateAndHDR().first);
 
@@ -122,8 +128,10 @@
     EXPECT_FLOAT_EQ(MAX_REFRESH_RATE, mLayerHistory->getDesiredRefreshRateAndHDR().first);
     // After 1200 ms frames become obsolete.
     std::this_thread::sleep_for(std::chrono::milliseconds(1500));
-    // Insert the 31st frame.
-    mLayerHistory->insert(test30FpsLayer, startTime + (30 * 33333333), false /*isHDR*/);
+
+    mLayerHistory->insert(test30FpsLayer,
+                          startTime + (RELEVANT_FRAME_THRESHOLD * THIRTY_FPS_INTERVAL),
+                          false /*isHDR*/);
     EXPECT_FLOAT_EQ(30.f, mLayerHistory->getDesiredRefreshRateAndHDR().first);
 }