added support for face filters

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## 0.0.87
+
+- Added basic support for face filters
+
 ## 0.0.86
 
 - Allows to reopen send images (if send without time limit or enabled auth) 

ios/Podfile.lock

@@ -136,6 +136,10 @@ PODS:
   - google_mlkit_commons (0.11.0):
     - Flutter
     - MLKitVision
+  - google_mlkit_face_detection (0.13.1):
+    - Flutter
+    - google_mlkit_commons
+    - GoogleMLKit/FaceDetection (~> 7.0.0)
   - GoogleAdsOnDeviceConversion (3.2.0):
     - GoogleUtilities/Environment (~> 8.1)
     - GoogleUtilities/Logger (~> 8.1)
@@ -169,6 +173,9 @@ PODS:
   - GoogleMLKit/BarcodeScanning (7.0.0):
     - GoogleMLKit/MLKitCore
     - MLKitBarcodeScanning (~> 6.0.0)
+  - GoogleMLKit/FaceDetection (7.0.0):
+    - GoogleMLKit/MLKitCore
+    - MLKitFaceDetection (~> 6.0.0)
   - GoogleMLKit/MLKitCore (7.0.0):
     - MLKitCommon (~> 12.0.0)
   - GoogleToolboxForMac/Defines (4.2.1)
@@ -251,6 +258,9 @@ PODS:
     - GoogleUtilities/Logger (~> 8.0)
     - GoogleUtilities/UserDefaults (~> 8.0)
     - GTMSessionFetcher/Core (< 4.0, >= 3.3.2)
+  - MLKitFaceDetection (6.0.0):
+    - MLKitCommon (~> 12.0)
+    - MLKitVision (~> 8.0)
   - MLKitVision (8.0.0):
     - GoogleToolboxForMac/Logger (< 5.0, >= 4.2.1)
     - "GoogleToolboxForMac/NSData+zlib (< 5.0, >= 4.2.1)"
@@ -357,6 +367,7 @@ DEPENDENCIES:
   - gal (from `.symlinks/plugins/gal/darwin`)
   - google_mlkit_barcode_scanning (from `.symlinks/plugins/google_mlkit_barcode_scanning/ios`)
   - google_mlkit_commons (from `.symlinks/plugins/google_mlkit_commons/ios`)
+  - google_mlkit_face_detection (from `.symlinks/plugins/google_mlkit_face_detection/ios`)
   - GoogleUtilities
   - image_picker_ios (from `.symlinks/plugins/image_picker_ios/ios`)
   - in_app_purchase_storekit (from `.symlinks/plugins/in_app_purchase_storekit/darwin`)
@@ -398,6 +409,7 @@ SPEC REPOS:
     - MLImage
     - MLKitBarcodeScanning
     - MLKitCommon
+    - MLKitFaceDetection
     - MLKitVision
     - nanopb
     - PromisesObjC
@@ -454,6 +466,8 @@ EXTERNAL SOURCES:
     :path: ".symlinks/plugins/google_mlkit_barcode_scanning/ios"
   google_mlkit_commons:
     :path: ".symlinks/plugins/google_mlkit_commons/ios"
+  google_mlkit_face_detection:
+    :path: ".symlinks/plugins/google_mlkit_face_detection/ios"
   image_picker_ios:
     :path: ".symlinks/plugins/image_picker_ios/ios"
   in_app_purchase_storekit:
@@ -518,6 +532,7 @@ SPEC CHECKSUMS:
   gal: baecd024ebfd13c441269ca7404792a7152fde89
   google_mlkit_barcode_scanning: 8f5987f244a43fe1167689c548342a5174108159
   google_mlkit_commons: 2abe6a70e1824e431d16a51085cb475b672c8aab
+  google_mlkit_face_detection: 754da2113a1952f063c7c5dc347ac6ae8934fb77
   GoogleAdsOnDeviceConversion: d68c69dd9581a0f5da02617b6f377e5be483970f
   GoogleAppMeasurement: 3bf40aff49a601af5da1c3345702fcb4991d35ee
   GoogleDataTransport: aae35b7ea0c09004c3797d53c8c41f66f219d6a7
@@ -533,6 +548,7 @@ SPEC CHECKSUMS:
   MLImage: 0ad1c5f50edd027672d8b26b0fee78a8b4a0fc56
   MLKitBarcodeScanning: 0a3064da0a7f49ac24ceb3cb46a5bc67496facd2
   MLKitCommon: 07c2c33ae5640e5380beaaa6e4b9c249a205542d
+  MLKitFaceDetection: 2a593db4837db503ad3426b565e7aab045cefea5
   MLKitVision: 45e79d68845a2de77e2dd4d7f07947f0ed157b0e
   nanopb: fad817b59e0457d11a5dfbde799381cd727c1275
   no_screenshot: 89e778ede9f1e39cc3fb9404d782a42712f2a0b2

lib/src/views/camera/camera_preview_components/camera_preview.dart

@@ -37,7 +37,18 @@ class MainCameraPreview extends StatelessWidget {
                       .cameraController!.value.previewSize!.width,
                   child: CameraPreview(
                     mainCameraController.cameraController!,
-                    child: mainCameraController.customPaint,
+                    child: Stack(
+                      children: [
+                        if (mainCameraController.customPaint != null)
+                          Positioned.fill(
+                            child: mainCameraController.customPaint!,
+                          ),
+                        if (mainCameraController.facePaint != null)
+                          Positioned.fill(
+                            child: mainCameraController.facePaint!,
+                          ),
+                      ],
+                    ),
                   ),
                 ),
               ),

lib/src/views/camera/camera_preview_components/camera_preview_controller_view.dart

@@ -21,6 +21,7 @@ import 'package:twonly/src/utils/misc.dart';
 import 'package:twonly/src/utils/qr.dart';
 import 'package:twonly/src/utils/screenshot.dart';
 import 'package:twonly/src/utils/storage.dart';
+import 'package:twonly/src/views/camera/camera_preview_components/face_filters.dart';
 import 'package:twonly/src/views/camera/camera_preview_components/main_camera_controller.dart';
 import 'package:twonly/src/views/camera/camera_preview_components/permissions_view.dart';
 import 'package:twonly/src/views/camera/camera_preview_components/send_to.dart';
@@ -506,6 +507,36 @@ class _CameraPreviewViewState extends State<CameraPreviewView> {
     });
   }
 
+  Future<void> pressSideButtonLeft() async {
+    if (!mc.isSelectingFaceFilters) {
+      return pickImageFromGallery();
+    }
+    if (mc.currentFilterType.index == 1) {
+      mc.setFilter(FaceFilterType.none);
+      setState(() {
+        mc.isSelectingFaceFilters = false;
+      });
+      return;
+    }
+    mc.setFilter(mc.currentFilterType.goLeft());
+  }
+
+  Future<void> pressSideButtonRight() async {
+    if (!mc.isSelectingFaceFilters) {
+      setState(() {
+        mc.isSelectingFaceFilters = true;
+      });
+    }
+    if (mc.currentFilterType.index == FaceFilterType.values.length - 1) {
+      mc.setFilter(FaceFilterType.none);
+      setState(() {
+        mc.isSelectingFaceFilters = false;
+      });
+      return;
+    }
+    mc.setFilter(mc.currentFilterType.goRight());
+  }
+
   Future<void> startVideoRecording() async {
     if (mc.cameraController != null &&
         mc.cameraController!.value.isRecordingVideo) {
@@ -736,15 +767,19 @@ class _CameraPreviewViewState extends State<CameraPreviewView> {
                         children: [
                           if (!_isVideoRecording)
                             GestureDetector(
-                              onTap: pickImageFromGallery,
+                              onTap: pressSideButtonLeft,
                               child: Align(
                                 child: Container(
                                   height: 50,
                                   width: 80,
                                   padding: const EdgeInsets.all(2),
-                                  child: const Center(
+                                  child: Center(
                                     child: FaIcon(
-                                      FontAwesomeIcons.photoFilm,
+                                      mc.isSelectingFaceFilters
+                                          ? mc.currentFilterType.index == 1
+                                              ? FontAwesomeIcons.xmark
+                                              : FontAwesomeIcons.arrowLeft
+                                          : FontAwesomeIcons.photoFilm,
                                       color: Colors.white,
                                       size: 25,
                                     ),
@@ -771,10 +806,39 @@ class _CameraPreviewViewState extends State<CameraPreviewView> {
                                         : Colors.white,
                                   ),
                                 ),
+                                child: mc.currentFilterType.preview,
                               ),
                             ),
                           ),
-                          if (!_isVideoRecording) const SizedBox(width: 80),
+                          if (!_isVideoRecording)
+                            if (isFront)
+                              GestureDetector(
+                                onTap: pressSideButtonRight,
+                                child: Align(
+                                  child: Container(
+                                    height: 50,
+                                    width: 80,
+                                    padding: const EdgeInsets.all(2),
+                                    child: Center(
+                                      child: FaIcon(
+                                        mc.isSelectingFaceFilters
+                                            ? mc.currentFilterType.index ==
+                                                    FaceFilterType
+                                                            .values.length -
+                                                        1
+                                                ? FontAwesomeIcons.xmark
+                                                : FontAwesomeIcons.arrowRight
+                                            : FontAwesomeIcons
+                                                .faceGrinTongueSquint,
+                                        color: Colors.white,
+                                        size: 25,
+                                      ),
+                                    ),
+                                  ),
+                                ),
+                              )
+                            else
+                              const SizedBox(width: 80),
                         ],
                       ),
                     ],

lib/src/views/camera/camera_preview_components/face_filters.dart

@@ -0,0 +1,33 @@
+import 'package:flutter/material.dart';
+import 'package:twonly/src/views/camera/painters/face_filters/beard_filter_painter.dart';
+import 'package:twonly/src/views/camera/painters/face_filters/dog_filter_painter.dart';
+
+enum FaceFilterType {
+  none,
+  dogBrown,
+  beardUpperLip,
+}
+
+extension FaceFilterTypeExtension on FaceFilterType {
+  FaceFilterType goRight() {
+    final nextIndex = (index + 1) % FaceFilterType.values.length;
+    return FaceFilterType.values[nextIndex];
+  }
+
+  FaceFilterType goLeft() {
+    final prevIndex = (index - 1 + FaceFilterType.values.length) %
+        FaceFilterType.values.length;
+    return FaceFilterType.values[prevIndex];
+  }
+
+  Widget get preview {
+    switch (this) {
+      case FaceFilterType.none:
+        return Container();
+      case FaceFilterType.dogBrown:
+        return DogFilterPainter.getPreview();
+      case FaceFilterType.beardUpperLip:
+        return BeardFilterPainter.getPreview();
+    }
+  }
+}

lib/src/views/camera/camera_preview_components/main_camera_controller.dart

@@ -5,6 +5,7 @@ import 'package:drift/drift.dart' show Value;
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:google_mlkit_barcode_scanning/google_mlkit_barcode_scanning.dart';
+import 'package:google_mlkit_face_detection/google_mlkit_face_detection.dart';
 import 'package:twonly/globals.dart';
 import 'package:twonly/src/database/daos/contacts.dao.dart';
 import 'package:twonly/src/database/twonly.db.dart';
@@ -15,7 +16,11 @@ import 'package:twonly/src/utils/misc.dart';
 import 'package:twonly/src/utils/qr.dart';
 import 'package:twonly/src/utils/screenshot.dart';
 import 'package:twonly/src/views/camera/camera_preview_components/camera_preview_controller_view.dart';
+import 'package:twonly/src/views/camera/camera_preview_components/face_filters.dart';
 import 'package:twonly/src/views/camera/painters/barcode_detector_painter.dart';
+import 'package:twonly/src/views/camera/painters/face_filters/beard_filter_painter.dart';
+import 'package:twonly/src/views/camera/painters/face_filters/dog_filter_painter.dart';
+import 'package:twonly/src/views/camera/painters/face_filters/face_filter_painter.dart';
 
 class ScannedVerifiedContact {
   ScannedVerifiedContact({
@@ -45,6 +50,22 @@ class MainCameraController {
   Map<int, ScannedNewProfile> scannedNewProfiles = {};
   String? scannedUrl;
   GlobalKey zoomButtonKey = GlobalKey();
+  bool isSelectingFaceFilters = false;
+
+  final BarcodeScanner _barcodeScanner = BarcodeScanner();
+  final FaceDetector _faceDetector = FaceDetector(
+    options: FaceDetectorOptions(
+      enableContours: true,
+      enableLandmarks: true,
+    ),
+  );
+  bool _isBusy = false;
+  bool _isBusyFaces = false;
+  CustomPaint? customPaint;
+  CustomPaint? facePaint;
+
+  FaceFilterType _currentFilterType = FaceFilterType.beardUpperLip;
+  FaceFilterType get currentFilterType => _currentFilterType;
 
   Future<void> closeCamera() async {
     contactsVerified = {};
@@ -73,10 +94,9 @@ class MainCameraController {
       selectedCameraDetails = opts.$1;
       cameraController = opts.$2;
     }
-    if (cameraController?.description.lensDirection ==
-        CameraLensDirection.back) {
-      await cameraController?.startImageStream(_processCameraImage);
-    }
+    isSelectingFaceFilters = false;
+    setFilter(FaceFilterType.none);
+    await cameraController?.startImageStream(_processCameraImage);
     zoomButtonKey = GlobalKey();
     setState();
     return cameraController;
@@ -95,13 +115,23 @@ class MainCameraController {
     }
     final tmp = cameraController;
     cameraController = null;
+    facePaint = null;
+    customPaint = null;
     await tmp!.dispose();
     await selectCamera((selectedCameraDetails.cameraId + 1) % 2, false);
   }
 
-  final BarcodeScanner _barcodeScanner = BarcodeScanner();
-  bool _isBusy = false;
-  CustomPaint? customPaint;
+  void setFilter(FaceFilterType type) {
+    _currentFilterType = type;
+    if (_currentFilterType == FaceFilterType.none) {
+      faceFilterPainter = null;
+      facePaint = null;
+      _isBusyFaces = false;
+    }
+    setState();
+  }
+
+  FaceFilterPainter? faceFilterPainter;
 
   final Map<DeviceOrientation, int> _orientations = {
     DeviceOrientation.portraitUp: 0,
@@ -113,7 +143,16 @@ class MainCameraController {
   void _processCameraImage(CameraImage image) {
     final inputImage = _inputImageFromCameraImage(image);
     if (inputImage == null) return;
-    _processImage(inputImage);
+    _processBarcode(inputImage);
+    // check if front camera is selected
+    if (cameraController?.description.lensDirection ==
+        CameraLensDirection.front) {
+      if (_currentFilterType != FaceFilterType.none) {
+        _processFaces(inputImage);
+      }
+    } else {
+      _processBarcode(inputImage);
+    }
   }
 
   InputImage? _inputImageFromCameraImage(CameraImage image) {
@@ -175,7 +214,7 @@ class MainCameraController {
     );
   }
 
-  Future<void> _processImage(InputImage inputImage) async {
+  Future<void> _processBarcode(InputImage inputImage) async {
     if (_isBusy) return;
     _isBusy = true;
     final barcodes = await _barcodeScanner.processImage(inputImage);
@@ -255,4 +294,48 @@ class MainCameraController {
     _isBusy = false;
     setState();
   }
+
+  Future<void> _processFaces(InputImage inputImage) async {
+    if (_isBusyFaces) return;
+    _isBusyFaces = true;
+    final faces = await _faceDetector.processImage(inputImage);
+    if (inputImage.metadata?.size != null &&
+        inputImage.metadata?.rotation != null &&
+        cameraController != null) {
+      if (faces.isNotEmpty) {
+        CustomPainter? painter;
+        if (_currentFilterType == FaceFilterType.dogBrown) {
+          painter = DogFilterPainter(
+            faces,
+            inputImage.metadata!.size,
+            inputImage.metadata!.rotation,
+            cameraController!.description.lensDirection,
+          );
+        } else if (_currentFilterType == FaceFilterType.beardUpperLip) {
+          painter = BeardFilterPainter(
+            faces,
+            inputImage.metadata!.size,
+            inputImage.metadata!.rotation,
+            cameraController!.description.lensDirection,
+          );
+        }
+
+        if (painter != null) {
+          facePaint = CustomPaint(painter: painter);
+          // Also set the correct FaceFilterPainter reference if needed for other logic,
+          // though currently facePaint is what's used for display.
+          if (painter is FaceFilterPainter) {
+            faceFilterPainter = painter;
+          }
+        } else {
+          facePaint = null;
+          faceFilterPainter = null;
+        }
+      } else {
+        facePaint = null;
+      }
+    }
+    _isBusyFaces = false;
+    setState();
+  }
 }

lib/src/views/camera/painters/face_filters/beard_filter_painter.dart

@@ -0,0 +1,174 @@
+import 'dart:async';
+import 'dart:math';
+import 'dart:ui' as ui;
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:google_mlkit_face_detection/google_mlkit_face_detection.dart';
+import 'package:twonly/src/utils/log.dart';
+import 'package:twonly/src/views/camera/painters/coordinates_translator.dart';
+import 'package:twonly/src/views/camera/painters/face_filters/face_filter_painter.dart';
+
+class BeardFilterPainter extends FaceFilterPainter {
+  BeardFilterPainter(
+    super.faces,
+    super.imageSize,
+    super.rotation,
+    super.cameraLensDirection,
+  ) {
+    _loadAssets();
+  }
+
+  static ui.Image? _beardImage;
+  static bool _loading = false;
+
+  static Future<void> _loadAssets() async {
+    if (_loading || _beardImage != null) return;
+    _loading = true;
+    try {
+      _beardImage = await _loadImage('assets/filters/beard_upper_lip.webp');
+    } catch (e) {
+      Log.error('Failed to load filter assets: $e');
+    } finally {
+      _loading = false;
+    }
+  }
+
+  static Future<ui.Image> _loadImage(String assetPath) async {
+    final data = await rootBundle.load(assetPath);
+    final list = Uint8List.view(data.buffer);
+    final completer = Completer<ui.Image>();
+    ui.decodeImageFromList(list, completer.complete);
+    return completer.future;
+  }
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    if (_beardImage == null) return;
+
+    for (final face in faces) {
+      final noseBase = face.landmarks[FaceLandmarkType.noseBase];
+      final mouthLeft = face.landmarks[FaceLandmarkType.leftMouth];
+      final mouthRight = face.landmarks[FaceLandmarkType.rightMouth];
+      final bottomMouth = face.landmarks[FaceLandmarkType.bottomMouth];
+
+      if (noseBase != null &&
+          mouthLeft != null &&
+          mouthRight != null &&
+          bottomMouth != null) {
+        final noseX = translateX(
+          noseBase.position.x.toDouble(),
+          size,
+          imageSize,
+          rotation,
+          cameraLensDirection,
+        );
+        final noseY = translateY(
+          noseBase.position.y.toDouble(),
+          size,
+          imageSize,
+          rotation,
+          cameraLensDirection,
+        );
+
+        final mouthLeftX = translateX(
+          mouthLeft.position.x.toDouble(),
+          size,
+          imageSize,
+          rotation,
+          cameraLensDirection,
+        );
+        final mouthLeftY = translateY(
+          mouthLeft.position.y.toDouble(),
+          size,
+          imageSize,
+          rotation,
+          cameraLensDirection,
+        );
+
+        final mouthRightX = translateX(
+          mouthRight.position.x.toDouble(),
+          size,
+          imageSize,
+          rotation,
+          cameraLensDirection,
+        );
+        final mouthRightY = translateY(
+          mouthRight.position.y.toDouble(),
+          size,
+          imageSize,
+          rotation,
+          cameraLensDirection,
+        );
+
+        final mouthCenterX = (mouthLeftX + mouthRightX) / 2;
+        final mouthCenterY = (mouthLeftY + mouthRightY) / 2;
+
+        final beardCenterX = (noseX + mouthCenterX) / 2;
+        final beardCenterY = (noseY + mouthCenterY) / 2;
+
+        final dx = mouthRightX - mouthLeftX;
+        final dy = mouthRightY - mouthLeftY;
+        final angle = atan2(dy, dx);
+
+        final mouthWidth = sqrt(dx * dx + dy * dy);
+        final beardWidth = mouthWidth * 1.5;
+
+        final yaw = face.headEulerAngleY ?? 0;
+        final scaleX = cos(yaw * pi / 180).abs();
+
+        _drawImage(
+          canvas,
+          _beardImage!,
+          Offset(beardCenterX, beardCenterY),
+          beardWidth,
+          angle,
+          scaleX,
+        );
+      }
+    }
+  }
+
+  void _drawImage(
+    Canvas canvas,
+    ui.Image image,
+    Offset position,
+    double width,
+    double rotation,
+    double scaleX,
+  ) {
+    canvas
+      ..save()
+      ..translate(position.dx, position.dy)
+      ..rotate(rotation)
+      ..scale(scaleX, -1);
+
+    final srcRect =
+        Rect.fromLTWH(0, 0, image.width.toDouble(), image.height.toDouble());
+
+    final aspectRatio = image.width / image.height;
+    final dstWidth = width;
+    final dstHeight = width / aspectRatio;
+
+    final dstRect = Rect.fromCenter(
+      center: Offset.zero,
+      width: dstWidth,
+      height: dstHeight,
+    );
+
+    canvas
+      ..drawImageRect(image, srcRect, dstRect, Paint())
+      ..restore();
+  }
+
+  static Widget getPreview() {
+    return Preview(
+      child: Padding(
+        padding: const EdgeInsets.all(8),
+        child: Image.asset(
+          'assets/filters/beard_upper_lip.webp',
+          fit: BoxFit.contain,
+        ),
+      ),
+    );
+  }
+}

lib/src/views/camera/painters/face_filters/dog_filter_painter.dart

@@ -0,0 +1,242 @@
+import 'dart:async';
+import 'dart:math';
+import 'dart:ui' as ui;
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:google_mlkit_face_detection/google_mlkit_face_detection.dart';
+import 'package:twonly/src/utils/log.dart';
+import 'package:twonly/src/views/camera/painters/coordinates_translator.dart';
+import 'package:twonly/src/views/camera/painters/face_filters/face_filter_painter.dart';
+
+class DogFilterPainter extends FaceFilterPainter {
+  DogFilterPainter(
+    super.faces,
+    super.imageSize,
+    super.rotation,
+    super.cameraLensDirection,
+  ) {
+    _loadAssets();
+  }
+
+  static ui.Image? _earImage;
+  static ui.Image? _noseImage;
+  static bool _loading = false;
+
+  static Future<void> _loadAssets() async {
+    if (_loading || (_earImage != null && _noseImage != null)) return;
+    _loading = true;
+    try {
+      _earImage = await _loadImage('assets/filters/dog_brown_ear.webp');
+      _noseImage = await _loadImage('assets/filters/dog_brown_nose.webp');
+    } catch (e) {
+      Log.error('Failed to load filter assets: $e');
+    } finally {
+      _loading = false;
+    }
+  }
+
+  static Future<ui.Image> _loadImage(String assetPath) async {
+    final data = await rootBundle.load(assetPath);
+    final list = Uint8List.view(data.buffer);
+    final completer = Completer<ui.Image>();
+    ui.decodeImageFromList(list, completer.complete);
+    return completer.future;
+  }
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    if (_earImage == null || _noseImage == null) return;
+
+    for (final face in faces) {
+      final faceContour = face.contours[FaceContourType.face];
+      final noseBase = face.landmarks[FaceLandmarkType.noseBase];
+
+      if (faceContour != null && noseBase != null) {
+        final points = faceContour.points;
+        if (points.isEmpty) continue;
+
+        final upperPoints =
+            points.where((p) => p.y < noseBase.position.y).toList();
+
+        if (upperPoints.isEmpty) continue;
+
+        Point<int>? leftMost;
+        Point<int>? rightMost;
+        Point<int>? topMost;
+
+        for (final point in upperPoints) {
+          if (leftMost == null || point.x < leftMost.x) {
+            leftMost = point;
+          }
+          if (rightMost == null || point.x > rightMost.x) {
+            rightMost = point;
+          }
+          if (topMost == null || point.y < topMost.y) {
+            topMost = point;
+          }
+        }
+
+        if (leftMost == null || rightMost == null || topMost == null) continue;
+
+        final leftEarX = translateX(
+          leftMost.x.toDouble(),
+          size,
+          imageSize,
+          rotation,
+          cameraLensDirection,
+        );
+        final leftEarY = translateY(
+          topMost.y.toDouble(),
+          size,
+          imageSize,
+          rotation,
+          cameraLensDirection,
+        );
+
+        final rightEarX = translateX(
+          rightMost.x.toDouble(),
+          size,
+          imageSize,
+          rotation,
+          cameraLensDirection,
+        );
+        final rightEarY = translateY(
+          topMost.y.toDouble(),
+          size,
+          imageSize,
+          rotation,
+          cameraLensDirection,
+        );
+
+        final noseX = translateX(
+          noseBase.position.x.toDouble(),
+          size,
+          imageSize,
+          rotation,
+          cameraLensDirection,
+        );
+        final noseY = translateY(
+          noseBase.position.y.toDouble(),
+          size,
+          imageSize,
+          rotation,
+          cameraLensDirection,
+        );
+
+        final dx = rightEarX - leftEarX;
+        final dy = rightEarY - leftEarY;
+
+        final faceWidth = sqrt(dx * dx + dy * dy) * 1.5;
+        final angle = atan2(dy, dx);
+
+        final yaw = face.headEulerAngleY ?? 0;
+        final scaleX = cos(yaw * pi / 180).abs();
+
+        final earSize = faceWidth / 2.5;
+
+        _drawImage(
+          canvas,
+          _earImage!,
+          Offset(leftEarX, leftEarY + earSize * 0.3),
+          earSize,
+          angle,
+          scaleX,
+        );
+
+        _drawImage(
+          canvas,
+          _earImage!,
+          Offset(rightEarX, rightEarY + earSize * 0.3),
+          earSize,
+          angle,
+          scaleX,
+          isFlipped: true,
+        );
+
+        final noseSize = faceWidth * 0.4;
+        _drawImage(
+          canvas,
+          _noseImage!,
+          Offset(noseX, noseY + noseSize * 0.1),
+          noseSize,
+          angle,
+          scaleX,
+        );
+      }
+    }
+  }
+
+  void _drawImage(
+    Canvas canvas,
+    ui.Image image,
+    Offset position,
+    double size,
+    double rotation,
+    double scaleX, {
+    bool isFlipped = false,
+  }) {
+    canvas
+      ..save()
+      ..translate(position.dx, position.dy)
+      ..rotate(rotation);
+    if (isFlipped) {
+      canvas.scale(-scaleX, -1);
+    } else {
+      canvas.scale(scaleX, -1);
+    }
+
+    final srcRect =
+        Rect.fromLTWH(0, 0, image.width.toDouble(), image.height.toDouble());
+    final aspectRatio = image.width / image.height;
+    final dstWidth = size;
+    final dstHeight = size / aspectRatio;
+
+    final dstRect = Rect.fromCenter(
+      center: Offset.zero,
+      width: dstWidth,
+      height: dstHeight,
+    );
+
+    canvas
+      ..drawImageRect(image, srcRect, dstRect, Paint())
+      ..restore();
+  }
+
+  static Widget getPreview() {
+    return Preview(
+      child: Stack(
+        alignment: Alignment.center,
+        children: [
+          Padding(
+            padding: const EdgeInsets.only(top: 25),
+            child: Image.asset(
+              'assets/filters/dog_brown_nose.webp',
+              width: 25,
+            ),
+          ),
+          Padding(
+            padding: const EdgeInsets.only(bottom: 10),
+            child: Row(
+              mainAxisSize: MainAxisSize.min,
+              mainAxisAlignment: MainAxisAlignment.center,
+              children: [
+                Image.asset(
+                  'assets/filters/dog_brown_ear.webp',
+                  width: 20,
+                ),
+                const SizedBox(width: 15),
+                Transform.scale(
+                  scaleX: -1,
+                  child: Image.asset(
+                    'assets/filters/dog_brown_ear.webp',
+                    width: 20,
+                  ),
+                ),
+              ],
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}

lib/src/views/camera/painters/face_filters/face_filter_painter.dart

@@ -0,0 +1,44 @@
+import 'package:camera/camera.dart';
+import 'package:flutter/material.dart';
+import 'package:google_mlkit_face_detection/google_mlkit_face_detection.dart';
+
+abstract class FaceFilterPainter extends CustomPainter {
+  FaceFilterPainter(
+    this.faces,
+    this.imageSize,
+    this.rotation,
+    this.cameraLensDirection,
+  );
+
+  final List<Face> faces;
+  final Size imageSize;
+  final InputImageRotation rotation;
+  final CameraLensDirection cameraLensDirection;
+
+  @override
+  bool shouldRepaint(covariant FaceFilterPainter oldDelegate) {
+    return oldDelegate.imageSize != imageSize ||
+        oldDelegate.faces != faces ||
+        oldDelegate.rotation != rotation ||
+        oldDelegate.cameraLensDirection != cameraLensDirection;
+  }
+}
+
+class Preview extends StatelessWidget {
+  const Preview({required this.child, super.key});
+
+  final Widget child;
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      decoration: BoxDecoration(
+        shape: BoxShape.circle,
+        color: Colors.grey.withValues(alpha: 0.2),
+      ),
+      child: Center(
+        child: child,
+      ),
+    );
+  }
+}

pubspec.lock

@@ -868,6 +868,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.11.0"
+  google_mlkit_face_detection:
+    dependency: "direct main"
+    description:
+      name: google_mlkit_face_detection
+      sha256: f336737d5b8a86797fd4368f42a5c26aeaa9c6dcc5243f0a16b5f6f663cfb70a
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.13.1"
   graphs:
     dependency: transitive
     description:

pubspec.yaml

@@ -3,7 +3,7 @@ description: "twonly, a privacy-friendly way to connect with friends through sec
 
 publish_to: 'none'
 
-version: 0.0.85+85
+version: 0.0.86+86
 
 environment:
   sdk: ^3.6.0
@@ -110,6 +110,7 @@ dependencies:
   hand_signature: ^3.0.3
   flutter_sharing_intent: ^2.0.4
   no_screenshot: ^0.3.1
+  google_mlkit_face_detection: ^0.13.1
 
 dependency_overrides:
   dots_indicator:
@@ -203,5 +204,6 @@ flutter:
     - assets/animated_icons/
     - assets/animations/
     - assets/passwords/
+    - assets/filters/
     - CHANGELOG.md