0.2.85

HOME_PERFORMANCE.md

@@ -0,0 +1,70 @@
+# Home performance baseline
+
+This is the repeatable performance check for Home. The source baseline is the current
+good-performing release line at commit `5467fba` (0.2.84). Numbers are only comparable on
+the same television, Android build, server, network and signed-in profile, so benchmark
+results belong with the test run or release notes rather than as universal targets here.
+
+## What is measured
+
+- `coldStartToHomeNoCompilation`: cold launch without ahead-of-time compilation, used as
+  the control for the baseline profile.
+- `coldStartToHomeWithProfile`: cold launch as a release is shipped. `timeToFullDisplayMs`
+  ends when Home reports its first D-pad-ready, settled frame.
+- `warmStartToHomeWithProfile`: returning to a resident process.
+- `homeDpadAndRows`: frame timing during rapid travel across cards, down four rows, and back
+  through already displayed artwork. The route deliberately does not idle between presses.
+- Debug milestones in `MembyStartup`: process start to `home_visible`,
+  `first_row_visible`, and `home_interactive`.
+- Debug frame windows in `EmbyClientPerf`: jank percentage, p50/p95/p99 UI frame time,
+  frames over 16 ms and 33 ms, and the maximum frame time.
+
+Compose Layout Inspector supplies card and row recomposition counts. Capture a system trace
+at the same time when a frame regression needs attribution; the trace shows Compose work,
+Coil fetch/decode activity and main-thread scheduling together.
+
+## Run protocol
+
+Use a physical TV with a signed-in profile and a populated Home cache. Keep the TV's display
+mode, server, network and Home row preferences unchanged between the reference and candidate
+runs.
+
+```powershell
+$env:JAVA_HOME = "C:\Program Files\Android\Android Studio\jbr"
+.\gradlew.bat :benchmark:connectedBenchmarkReleaseAndroidTest `
+  -P android.testInstrumentationRunnerArguments.class=com.ponzischeme89.memby.benchmark.HomeBenchmark
+```
+
+For an interactive debug capture, clear logcat, cold-start Memby, wait for Home, then rapidly
+hold Right and move through at least four rows. Record:
+
+```powershell
+adb logcat -s MembyStartup EmbyClientPerf
+```
+
+In Layout Inspector, enable recomposition counts and repeat the same route. Unchanged cards
+outside the old and new focus targets should normally be skipped; focus animation should not
+cause per-frame card recomposition. In Android Studio's system trace, inspect the slowest
+frames for main-thread Compose work and Coil image fetch/decode slices.
+
+## Regression gates
+
+Use the median of at least five iterations. Investigate before release when, against a fresh
+reference run on the same setup:
+
+- profiled cold-start `timeToFullDisplayMs` or warm start regresses by more than 10%;
+- `frameDurationCpuMs` p95 regresses by more than 10%, or p99 crosses 33 ms;
+- a previously displayed card causes a network fetch or another decode on the return pass;
+- focus animation recomposes a card on every animation frame or invalidates unaffected cards;
+- adding a Home row materially changes first-row visibility time. Below-the-fold rows may
+  affect `home_interactive`, but must not delay `first_row_visible`.
+
+Regenerate the baseline profile after changing the startup or first-browse path:
+
+```powershell
+.\gradlew.bat :app:generateReleaseBaselineProfile
+```
+
+Keep the reference and candidate benchmark result directories together. Hardware variance
+makes the paired result the baseline; a number copied from a different TV is not evidence of
+a regression or an improvement.

app/build.gradle.kts

@@ -1,3 +1,4 @@
+import com.android.build.api.dsl.ApplicationExtension
 import java.util.Properties
 
 plugins {
@@ -63,7 +64,7 @@ val projectNoticeText =
 
 // A release workflow can derive the app version from its Git tag without editing the
 // source tree. Local builds keep using the checked-in default.
-val defaultVersionName = "0.2.84"
+val defaultVersionName = "0.2.85"
 val membyVersionName: String =
     (project.findProperty("memby.versionName") as String?)
         ?.trim()
@@ -95,7 +96,7 @@ fun environmentSecret(key: String): String? {
     return System.getenv(key)?.trim()?.takeIf { it.isNotEmpty() }
 }
 
-android {
+extensions.configure<ApplicationExtension> {
     namespace = "com.ponzischeme89.memby"
     // Raised to 37 by the Lifecycle 2.11 / Activity 1.13 upgrade, which refuse to be
     // consumed by a project compiled against anything older. This is a *compile* target

app/src/main/java/com/ponzischeme89/memby/ui/HomeComponents.kt

@@ -1687,7 +1687,7 @@ internal fun MediaRow(
     onVerticalFocusRequestConsumed: (Int) -> Unit,
     onMoveVertical: (itemIndex: Int, direction: RowFocusDirection) -> Boolean,
     onContentFocused: () -> Unit,
-    onItemFocused: (BaseItem) -> Unit,
+    onItemFocused: (item: BaseItem, itemIndex: Int) -> Unit,
     onItemSelected: (BaseItem) -> Unit,
     onItemLongPressed: (BaseItem) -> Unit,
     density: String = "standard",
@@ -1840,7 +1840,9 @@ internal fun MediaRow(
                         }
                         val focused: () -> Unit = {
                             onContentFocused()
-                            onItemFocused(item)
+                            // LazyRow already knows the semantic position. Passing it on
+                            // avoids searching the row again on every D-pad focus move.
+                            onItemFocused(item, index)
                         }
                         val format = cardFormat(row.kind, item, artworkStyle)
                         if (row.kind == MediaRowKind.CONTINUE) {

app/src/main/java/com/ponzischeme89/memby/ui/HomeScreen.kt

@@ -1593,9 +1593,8 @@ internal fun HomeScreen(
                                     true
                                 },
                                 onContentFocused = { navigationExpanded = false },
-                                onItemFocused = { item ->
+                                onItemFocused = { item, itemIndex ->
-                                    val itemIndex = row.items.indexOfFirst { it.id == item.id }
+                                    rowFocusPositions[row.id] = itemIndex
-                                    if (itemIndex >= 0) rowFocusPositions[row.id] = itemIndex
                                     rowFocusedBelowHero = true
                                     if (selectedDestination == BrowseDestination.HOME) {
                                         focusedHomeRowId = row.id

app/src/main/java/com/ponzischeme89/memby/ui/LaunchPreroll.kt

@@ -77,7 +77,7 @@ internal object LaunchIntro {
  * - **The player is returned, not released.** It goes back to the process cache on dispose,
  *   which is what lets the very next playback still open on a prepared instance.
  */
-@OptIn(UnstableApi::class)
+@androidx.annotation.OptIn(markerClass = [UnstableApi::class])
 @Composable
 internal fun LaunchPrerollVideo(
     modifier: Modifier = Modifier,

app/src/main/java/com/ponzischeme89/memby/ui/player/PrerollPreloader.kt

@@ -19,7 +19,7 @@ import com.ponzischeme89.memby.R
  * sought back to the beginning and prepared again after use rather than reconstructed for
  * every title.
  */
-@OptIn(UnstableApi::class)
+@androidx.annotation.OptIn(markerClass = [UnstableApi::class])
 internal object PrerollPreloader {
     private val mainHandler = Handler(Looper.getMainLooper())
     private var applicationContext: Context? = null

app/src/test/java/com/ponzischeme89/memby/ui/HomeUiStateTest.kt

@@ -1,6 +1,7 @@
 package com.ponzischeme89.memby.ui
 
 import com.ponzischeme89.memby.data.HomeCache
+import com.ponzischeme89.memby.data.PlaybackPosition
 import com.ponzischeme89.memby.data.model.BaseItem
 import com.ponzischeme89.memby.data.model.HomeRow
 import com.ponzischeme89.memby.data.model.UserItemData

app/src/test/java/com/ponzischeme89/memby/ui/ResumableMediaCardTest.kt

@@ -36,8 +36,8 @@ class ResumableMediaCardTest {
     @Test
     fun finishTimeUsesRemainingRuntime() {
         val now = 1_000_000L
-        val runtime = 60L * 60L * TICKS_PER_MILLISECOND_FOR_TEST
+        val runtime = 60L * 60L * MILLIS_PER_SECOND * TICKS_PER_MILLISECOND_FOR_TEST
-        val position = 15L * 60L * TICKS_PER_MILLISECOND_FOR_TEST
+        val position = 15L * 60L * MILLIS_PER_SECOND * TICKS_PER_MILLISECOND_FOR_TEST
 
         assertEquals(
             now + 45L * 60L * 1_000L,
@@ -61,6 +61,7 @@ class ResumableMediaCardTest {
     }
 
     private companion object {
+        const val MILLIS_PER_SECOND = 1_000L
         const val TICKS_PER_MILLISECOND_FOR_TEST = 10_000L
     }
 }

benchmark/src/main/java/com/ponzischeme89/memby/benchmark/HomeBenchmark.kt

@@ -64,14 +64,32 @@ class HomeBenchmark {
     )
 
     private fun MacrobenchmarkScope.exerciseHome() {
+        // Do not wait between presses: a real performance problem is most visible while a
+        // viewer holds the remote and focus animations, lazy composition and image decode
+        // overlap. Travelling both ways also covers cached artwork and item reuse rather
+        // than measuring only the first decode of each card.
+        repeat(HORIZONTAL_PRESSES) {
             device.pressKeyCode(android.view.KeyEvent.KEYCODE_DPAD_RIGHT)
-        device.pressKeyCode(android.view.KeyEvent.KEYCODE_DPAD_RIGHT)
+        }
+        repeat(VERTICAL_PRESSES) {
             device.pressKeyCode(android.view.KeyEvent.KEYCODE_DPAD_DOWN)
+            repeat(HORIZONTAL_PRESSES_PER_ROW) {
                 device.pressKeyCode(android.view.KeyEvent.KEYCODE_DPAD_RIGHT)
+            }
+        }
+        repeat(VERTICAL_PRESSES) {
+            device.pressKeyCode(android.view.KeyEvent.KEYCODE_DPAD_UP)
+            repeat(HORIZONTAL_PRESSES_PER_ROW) {
+                device.pressKeyCode(android.view.KeyEvent.KEYCODE_DPAD_LEFT)
+            }
+        }
         device.waitForIdle()
     }
 
     private companion object {
         const val PACKAGE_NAME = "com.ponzischeme89.memby"
+        const val HORIZONTAL_PRESSES = 12
+        const val HORIZONTAL_PRESSES_PER_ROW = 6
+        const val VERTICAL_PRESSES = 4
     }
 }