Add radial mode, UI controls, front camera, update to API 35

- Add radial/elliptical blur mode with aspect ratio control
- Add UI sliders for blur intensity, falloff, and shape
- Add front camera support with flip button
- Update minimum SDK to API 35 (Android 15)
- Enable landscape orientation (fullSensor)
- Rename app to "Naiv Tilt Shift Camera"
- Set APK output name to naiv-tilt-shift
- Add project specification document

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/src/main/java/no/naiv/tiltshift/camera/CameraManager.kt

@@ -41,8 +41,12 @@ class CameraManager(private val context: Context) {
     private val _maxZoomRatio = MutableStateFlow(1.0f)
     val maxZoomRatio: StateFlow<Float> = _maxZoomRatio.asStateFlow()
 
+    private val _isFrontCamera = MutableStateFlow(false)
+    val isFrontCamera: StateFlow<Boolean> = _isFrontCamera.asStateFlow()
+
     private var surfaceTextureProvider: (() -> SurfaceTexture?)? = null
     private var surfaceSize: Size = Size(1920, 1080)
+    private var lifecycleOwnerRef: LifecycleOwner? = null
 
     /**
      * Starts the camera with the given lifecycle owner.
@@ -53,6 +57,7 @@ class CameraManager(private val context: Context) {
         surfaceTextureProvider: () -> SurfaceTexture?
     ) {
         this.surfaceTextureProvider = surfaceTextureProvider
+        this.lifecycleOwnerRef = lifecycleOwner
 
         val cameraProviderFuture = ProcessCameraProvider.getInstance(context)
         cameraProviderFuture.addListener({
@@ -82,9 +87,13 @@ class CameraManager(private val context: Context) {
             .setCaptureMode(ImageCapture.CAPTURE_MODE_MAXIMIZE_QUALITY)
             .build()
 
-        // Get camera selector from lens controller
-        val cameraSelector = lensController.getCurrentLens()?.selector
-            ?: CameraSelector.DEFAULT_BACK_CAMERA
+        // Select camera based on front/back preference
+        val cameraSelector = if (_isFrontCamera.value) {
+            CameraSelector.DEFAULT_FRONT_CAMERA
+        } else {
+            // Use lens controller for back camera lens selection
+            lensController.getCurrentLens()?.selector ?: CameraSelector.DEFAULT_BACK_CAMERA
+        }
 
         try {
             // Bind use cases to camera
@@ -146,10 +155,19 @@ class CameraManager(private val context: Context) {
     }
 
     /**
-     * Switches to a different lens.
+     * Switches between front and back camera.
+     */
+    fun switchCamera() {
+        _isFrontCamera.value = !_isFrontCamera.value
+        _zoomRatio.value = 1.0f  // Reset zoom when switching
+        lifecycleOwnerRef?.let { bindCameraUseCases(it) }
+    }
+
+    /**
+     * Switches to a different lens (back camera only).
      */
     fun switchLens(lensId: String, lifecycleOwner: LifecycleOwner) {
-        if (lensController.selectLens(lensId)) {
+        if (!_isFrontCamera.value && lensController.selectLens(lensId)) {
             bindCameraUseCases(lifecycleOwner)
         }
     }
@@ -169,5 +187,6 @@ class CameraManager(private val context: Context) {
         camera = null
         preview = null
         imageCapture = null
+        lifecycleOwnerRef = null
     }
 }