fix: fit output after pip resize

app/src/main/java/com/droiddeck/launcher/SessionActivity.kt

@@ -2220,7 +2220,9 @@ class SessionActivity : ComponentActivity(), SurfaceHolder.Callback {
     }
 
     private fun windowOutputSize(width: Int, height: Int): Pair<Int, Int>? {
-        if (isInPictureInPictureMode || width <= 0 || height <= 0) return null
+        if (width <= 0 || height <= 0) return null
+        if (isInPictureInPictureMode) return com.droiddeck.launcher.session.PipPolicy.outputSize(
+            width, height, SessionState.outputSize.first, SessionState.outputSize.second)
         if (bottomGame != null) return when {
             SessionState.followScreen ->
                 com.droiddeck.launcher.session.SessionDisplay.followSize(width, height, false, SessionState.followScale)

app/src/main/java/com/droiddeck/launcher/session/PipPolicy.kt

@@ -11,4 +11,12 @@ object PipPolicy {
         height.toDouble() / width > 2.39 -> 100 to 239
         else -> width to height
     }
+
+    fun outputSize(width: Int, height: Int, outputWidth: Int, outputHeight: Int): Pair<Int, Int>? {
+        if (width <= 0 || height <= 0 || outputWidth <= 0 || outputHeight <= 0) return null
+        val scale = minOf(width.toFloat() / outputWidth, height.toFloat() / outputHeight)
+        val fittedWidth = ((outputWidth * scale).toInt() and 1.inv()).coerceAtLeast(2)
+        val fittedHeight = ((outputHeight * scale).toInt() and 1.inv()).coerceAtLeast(2)
+        return fittedWidth to fittedHeight
+    }
 }

app/src/test/java/com/droiddeck/launcher/session/PipPolicyTest.kt

@@ -24,4 +24,10 @@ class PipPolicyTest {
         assertEquals(100 to 239, PipPolicy.aspect(1080, 5760))
         assertEquals(16 to 9, PipPolicy.aspect(0, 0))
     }
+
+    @Test fun pipOutputFitsTheResizedSurfaceWithoutChangingAspectRatio() {
+        assertEquals(640 to 360, PipPolicy.outputSize(640, 480, 1920, 1080))
+        assertEquals(480 to 270, PipPolicy.outputSize(480, 270, 1920, 1080))
+        assertNull(PipPolicy.outputSize(0, 270, 1920, 1080))
+    }
 }