Migrate reader low brightness overlay to Compose

app/src/main/java/eu/kanade/presentation/reader/BrightnessOverlay.kt

@@ -0,0 +1,26 @@
+package eu.kanade.presentation.reader
+
+import androidx.compose.foundation.Canvas
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.graphicsLayer
+import kotlin.math.abs
+
+@Composable
+fun BrightnessOverlay(
+    value: Int,
+) {
+    if (value >= 0) return
+
+    Canvas(
+        modifier = Modifier
+            .fillMaxSize()
+            .graphicsLayer {
+                alpha = abs(value) / 100f
+            }
+    ) {
+        drawRect(Color.Black)
+    }
+}

app/src/main/java/eu/kanade/presentation/reader/appbars/ReaderAppBars.kt

@@ -9,10 +9,8 @@ import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Spacer
-import androidx.compose.foundation.layout.WindowInsets
 import androidx.compose.foundation.layout.fillMaxHeight
-import androidx.compose.foundation.layout.systemBars
-import androidx.compose.foundation.layout.windowInsetsPadding
+import androidx.compose.foundation.layout.systemBarsPadding
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.outlined.Bookmark
 import androidx.compose.material.icons.outlined.BookmarkBorder
@@ -70,7 +68,7 @@ fun ReaderAppBars(
         .copy(alpha = if (isSystemInDarkTheme()) 0.9f else 0.95f)
 
     val appBarModifier = if (fullscreen) {
-        Modifier.windowInsetsPadding(WindowInsets.systemBars)
+        Modifier.systemBarsPadding()
     } else {
         Modifier
     }

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt

@@ -42,6 +42,7 @@ import com.google.android.material.elevation.SurfaceColors
 import com.google.android.material.transition.platform.MaterialContainerTransform
 import dev.chrisbanes.insetter.applyInsetter
 import eu.kanade.domain.base.BasePreferences
+import eu.kanade.presentation.reader.BrightnessOverlay
 import eu.kanade.presentation.reader.OrientationModeSelectDialog
 import eu.kanade.presentation.reader.PageIndicatorText
 import eu.kanade.presentation.reader.ReaderPageActionsDialog
@@ -377,6 +378,10 @@ class ReaderActivity : BaseActivity() {
                 onClickSettings = viewModel::openSettingsDialog,
             )
 
+            BrightnessOverlay(
+                value = state.brightnessOverlayValue,
+            )
+
             val onDismissRequest = viewModel::closeDialog
             when (state.dialog) {
                 is ReaderViewModel.Dialog.Loading -> {
@@ -903,17 +908,9 @@ class ReaderActivity : BaseActivity() {
                 }
                 else -> WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_NONE
             }
-
             window.attributes = window.attributes.apply { screenBrightness = readerBrightness }
 
-            // Set black overlay visibility.
-            if (value < 0) {
-                binding.brightnessOverlay.isVisible = true
-                val alpha = (abs(value) * 2.56).toInt()
-                binding.brightnessOverlay.setBackgroundColor(Color.argb(alpha, 0, 0, 0))
-            } else {
-                binding.brightnessOverlay.isVisible = false
-            }
+            viewModel.setBrightnessOverlayValue(value)
         }
 
         /**

app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderViewModel.kt

@@ -736,6 +736,10 @@ class ReaderViewModel @JvmOverloads constructor(
         mutableState.update { it.copy(dialog = null) }
     }
 
+    fun setBrightnessOverlayValue(value: Int) {
+        mutableState.update { it.copy(brightnessOverlayValue = value) }
+    }
+
     /**
      * Saves the image of the selected page on the pictures directory and notifies the UI of the result.
      * There's also a notification to allow sharing the image somewhere else or deleting it.
@@ -894,6 +898,7 @@ class ReaderViewModel @JvmOverloads constructor(
         val viewer: Viewer? = null,
         val dialog: Dialog? = null,
         val menuVisible: Boolean = false,
+        val brightnessOverlayValue: Int = 0,
     ) {
         val currentChapter: ReaderChapter?
             get() = viewerChapters?.currChapter

app/src/main/res/layout/reader_activity.xml

@@ -35,12 +35,6 @@
         android:focusable="false"
         android:visibility="gone" />
 
-    <View
-        android:id="@+id/brightness_overlay"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:visibility="gone" />
-
     <androidx.compose.ui.platform.ComposeView
         android:id="@+id/dialog_root"
         android:layout_width="match_parent"