Support WallPaper DynamicColor on O_MR1 above

app/src/main/kotlin/com/hippo/ehviewer/ui/theme/Theme.kt

@@ -1,6 +1,10 @@
 package com.hippo.ehviewer.ui.theme
 
+import android.app.WallpaperManager
+import android.os.Build
+import androidx.annotation.RequiresApi
 import androidx.compose.foundation.scrollbar.LocalScrollbarStyle
+import androidx.compose.material3.ColorScheme
 import androidx.compose.material3.LocalContentColor
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.MotionScheme
@@ -16,34 +20,47 @@ import androidx.compose.ui.platform.LocalContext
 import com.hippo.ehviewer.Settings
 import com.hippo.ehviewer.collectAsState
 import com.hippo.ehviewer.ui.tools.scrollbarStyle
+import com.hippo.ehviewer.util.isAtLeastOMR1
 import com.hippo.ehviewer.util.isAtLeastS
+import com.materialkolor.dynamicColorScheme
+
+fun ColorScheme.amoled(amoled: Boolean) = if (amoled) {
+    copy(
+        surface = Color.Black,
+        onSurface = Color.White,
+        background = Color.Black,
+        onBackground = Color.White,
+    )
+} else {
+    this
+}
 
 @Composable
 fun EhTheme(useDarkTheme: Boolean, content: @Composable () -> Unit) {
     val amoled by Settings.blackDarkTheme.collectAsState()
     val context = LocalContext.current
-    val colors = if (useDarkTheme) {
-        if (isAtLeastS) {
-            dynamicDarkColorScheme(context)
+    val colors = if (isAtLeastS) {
+        if (useDarkTheme) {
+            dynamicDarkColorScheme(context).amoled(amoled)
         } else {
-            darkColorScheme()
-        }.let {
-            if (amoled) {
-                it.copy(
-                    surface = Color.Black,
-                    onSurface = Color.White,
-                    background = Color.Black,
-                    onBackground = Color.White,
-                )
-            } else {
-                it
-            }
+            dynamicLightColorScheme(context)
         }
     } else {
-        if (isAtLeastS) {
-            dynamicLightColorScheme(context)
+        val color = if (isAtLeastOMR1) extractWallPaperPalette() else null
+        if (color != null) {
+            dynamicColorScheme(
+                primary = color.first,
+                isDark = useDarkTheme,
+                isAmoled = amoled,
+                secondary = color.second,
+                tertiary = color.third,
+            )
         } else {
-            expressiveLightColorScheme()
+            if (useDarkTheme) {
+                darkColorScheme().amoled(amoled)
+            } else {
+                expressiveLightColorScheme()
+            }
         }
     }
 
@@ -57,6 +74,18 @@ fun EhTheme(useDarkTheme: Boolean, content: @Composable () -> Unit) {
     }
 }
 
+typealias WallPaperPalette = Triple<Color, Color?, Color?>
+
+@Composable
+@RequiresApi(Build.VERSION_CODES.O_MR1)
+fun extractWallPaperPalette(): WallPaperPalette? {
+    val colors = WallpaperManager.getInstance(LocalContext.current).getWallpaperColors(WallpaperManager.FLAG_SYSTEM) ?: return null
+    val primary = colors.primaryColor.toArgb().let { Color(it) }
+    val secondary = colors.secondaryColor?.toArgb()?.let { Color(it) }
+    val tertiary = colors.tertiaryColor?.toArgb()?.let { Color(it) }
+    return WallPaperPalette(primary, secondary, tertiary)
+}
+
 // https://issuetracker.google.com/363892346
 object CustomMotionScheme : MotionScheme by MotionScheme.expressive() {
     override fun <T> defaultSpatialSpec() = defaultEffectsSpec<T>()