Project import generated by Copybara.

GitOrigin-RevId: 373e3ac1e5839befd95bf7d73ceff3c5f1171969

WORKSPACE

@@ -16,11 +16,11 @@ bazel_skylib_workspace()
 load("@bazel_skylib//lib:versions.bzl", "versions")
 versions.check(minimum_bazel_version = "3.7.2")
 
-# ABSL cpp library lts_2020_09_23
+# ABSL cpp library lts_2021_03_24, patch 2.
 http_archive(
     name = "com_google_absl",
     urls = [
-        "https://github.com/abseil/abseil-cpp/archive/20200923.tar.gz",
+        "https://github.com/abseil/abseil-cpp/archive/refs/tags/20210324.2.tar.gz",
     ],
     # Remove after https://github.com/abseil/abseil-cpp/issues/326 is solved.
     patches = [
@@ -29,8 +29,8 @@ http_archive(
     patch_args = [
         "-p1",
     ],
-    strip_prefix = "abseil-cpp-20200923",
-    sha256 = "b3744a4f7a249d5eaf2309daad597631ce77ea62e0fc6abffbab4b4c3dc0fc08"
+    strip_prefix = "abseil-cpp-20210324.2",
+    sha256 = "59b862f50e710277f8ede96f083a5bb8d7c9595376146838b9580be90374ee1f"
 )
 
 http_archive(
@@ -333,6 +333,7 @@ maven_install(
         "androidx.concurrent:concurrent-futures:1.0.0-alpha03",
         "androidx.lifecycle:lifecycle-common:2.3.1",
         "androidx.activity:activity:1.2.2",
+        "androidx.exifinterface:exifinterface:1.3.3",
         "androidx.fragment:fragment:1.3.4",
         "androidx.annotation:annotation:aar:1.1.0",
         "androidx.appcompat:appcompat:aar:1.1.0-rc01",
@@ -349,8 +350,8 @@ maven_install(
         "com.google.auto.value:auto-value:1.8.1",
         "com.google.auto.value:auto-value-annotations:1.8.1",
         "com.google.code.findbugs:jsr305:latest.release",
-        "com.google.flogger:flogger-system-backend:latest.release",
-        "com.google.flogger:flogger:latest.release",
+        "com.google.flogger:flogger-system-backend:0.6",
+        "com.google.flogger:flogger:0.6",
         "com.google.guava:guava:27.0.1-android",
         "com.google.guava:listenablefuture:1.0",
         "junit:junit:4.12",
@@ -389,6 +390,8 @@ http_archive(
     patches = [
         "@//third_party:org_tensorflow_compatibility_fixes.diff",
         "@//third_party:org_tensorflow_objc_cxx17.diff",
+        # Diff is generated with a script, don't update it manually.
+        "@//third_party:org_tensorflow_custom_ops.diff",
     ],
     patch_args = [
         "-p1",

docs/getting_started/android_solutions.md

@@ -26,15 +26,17 @@ the following into the project's Gradle dependencies:
 
 ```
 dependencies {
-    // MediaPipe solution-core is the foundation of any MediaPipe solutions.
+    // MediaPipe solution-core is the foundation of any MediaPipe Solutions.
     implementation 'com.google.mediapipe:solution-core:latest.release'
-    // Optional: MediaPipe Hands solution.
-    implementation 'com.google.mediapipe:hands:latest.release'
-    // Optional: MediaPipe FaceMesh solution.
+    // Optional: MediaPipe Face Detection Solution.
+    implementation 'com.google.mediapipe:facedetection:latest.release'
+    // Optional: MediaPipe Face Mesh Solution.
     implementation 'com.google.mediapipe:facemesh:latest.release'
+    // Optional: MediaPipe Hands Solution.
+    implementation 'com.google.mediapipe:hands:latest.release'
     // MediaPipe deps
-    implementation 'com.google.flogger:flogger:latest.release'
-    implementation 'com.google.flogger:flogger-system-backend:latest.release'
+    implementation 'com.google.flogger:flogger:0.6'
+    implementation 'com.google.flogger:flogger-system-backend:0.6'
     implementation 'com.google.guava:guava:27.0.1-android'
     implementation 'com.google.protobuf:protobuf-java:3.11.4'
     // CameraX core library
@@ -45,7 +47,7 @@ dependencies {
 }
 ```
 
-See the detailed solutions API usage examples for different use cases in the
+See the detailed solution APIs usage examples for different use cases in the
 solution example apps'
 [source code](https://github.com/google/mediapipe/tree/master/mediapipe/examples/android/solutions).
 If the prebuilt maven packages are not sufficient, building the MediaPipe

docs/getting_started/faq.md

@@ -103,7 +103,7 @@ monotonically increasing timestamps. By convention, realtime calculators and
 graphs use the recording time or the presentation time as the timestamp for each
 packet, with each timestamp representing microseconds since
 `Jan/1/1970:00:00:00`. This allows packets from various sources to be processed
-in a gloablly consistent order.
+in a globally consistent order.
 
 Normally for offline processing, every input packet is processed and processing
 continues as long as necessary. For online processing, it is often necessary to

docs/solutions/face_detection.md

@@ -121,12 +121,10 @@ with mp_face_detection.FaceDetection(
       # If loading a video, use 'break' instead of 'continue'.
       continue
 
-    # Flip the image horizontally for a later selfie-view display, and convert
-    # the BGR image to RGB.
-    image = cv2.cvtColor(cv2.flip(image, 1), cv2.COLOR_BGR2RGB)
     # To improve performance, optionally mark the image as not writeable to
     # pass by reference.
     image.flags.writeable = False
+    image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
     results = face_detection.process(image)
 
     # Draw the face detection annotations on the image.
@@ -135,7 +133,8 @@ with mp_face_detection.FaceDetection(
     if results.detections:
       for detection in results.detections:
         mp_drawing.draw_detection(image, detection)
-    cv2.imshow('MediaPipe Face Detection', image)
+    # Flip the image horizontally for a selfie-view display.
+    cv2.imshow('MediaPipe Face Detection', cv2.flip(image, 1))
     if cv2.waitKey(5) & 0xFF == 27:
       break
 cap.release()
@@ -200,7 +199,7 @@ const faceDetection = new FaceDetection({locateFile: (file) => {
   return `https://cdn.jsdelivr.net/npm/@mediapipe/face_detection@0.0/${file}`;
 }});
 faceDetection.setOptions({
-  modelSelection: 0
+  modelSelection: 0,
   minDetectionConfidence: 0.5
 });
 faceDetection.onResults(onResults);
@@ -216,6 +215,194 @@ camera.start();
 </script>
 ```
 
+### Android Solution API
+
+Please first follow general
+[instructions](../getting_started/android_solutions.md#integrate-mediapipe-android-solutions-api)
+to add MediaPipe Gradle dependencies, then try the Face Detection Solution API
+in the companion
+[example Android Studio project](https://github.com/google/mediapipe/tree/master/mediapipe/examples/android/solutions/facedetection)
+following
+[these instructions](../getting_started/android_solutions.md#build-solution-example-apps-in-android-studio)
+and learn more in the usage example below.
+
+*   [staticImageMode](#static_image_mode)
+*   [modelSelection](#model_selection)
+
+#### Camera Input
+
+```java
+// For camera input and result rendering with OpenGL.
+FaceDetectionOptions faceDetectionOptions =
+    FaceDetectionOptions.builder()
+        .setStaticImageMode(false)
+        .setModelSelection(0).build();
+FaceDetection faceDetection = new FaceDetection(this, faceDetectionOptions);
+faceDetection.setErrorListener(
+    (message, e) -> Log.e(TAG, "MediaPipe Face Detection error:" + message));
+
+// Initializes a new CameraInput instance and connects it to MediaPipe Face Detection Solution.
+CameraInput cameraInput = new CameraInput(this);
+cameraInput.setNewFrameListener(
+    textureFrame -> faceDetection.send(textureFrame));
+
+// Initializes a new GlSurfaceView with a ResultGlRenderer<FaceDetectionResult> instance
+// that provides the interfaces to run user-defined OpenGL rendering code.
+// See mediapipe/examples/android/solutions/facedetection/src/main/java/com/google/mediapipe/examples/facedetection/FaceDetectionResultGlRenderer.java
+// as an example.
+SolutionGlSurfaceView<FaceDetectionResult> glSurfaceView =
+    new SolutionGlSurfaceView<>(
+        this, faceDetection.getGlContext(), faceDetection.getGlMajorVersion());
+glSurfaceView.setSolutionResultRenderer(new FaceDetectionResultGlRenderer());
+glSurfaceView.setRenderInputImage(true);
+faceDetection.setResultListener(
+    faceDetectionResult -> {
+      RelativeKeypoint noseTip =
+          FaceDetection.getFaceKeypoint(result, 0, FaceKeypoint.NOSE_TIP);
+      Log.i(
+          TAG,
+          String.format(
+              "MediaPipe Face Detection nose tip normalized coordinates (value range: [0, 1]): x=%f, y=%f",
+              noseTip.getX(), noseTip.getY()));
+      // Request GL rendering.
+      glSurfaceView.setRenderData(faceDetectionResult);
+      glSurfaceView.requestRender();
+    });
+
+// The runnable to start camera after the GLSurfaceView is attached.
+glSurfaceView.post(
+    () ->
+        cameraInput.start(
+            this,
+            faceDetection.getGlContext(),
+            CameraInput.CameraFacing.FRONT,
+            glSurfaceView.getWidth(),
+            glSurfaceView.getHeight()));
+```
+
+#### Image Input
+
+```java
+// For reading images from gallery and drawing the output in an ImageView.
+FaceDetectionOptions faceDetectionOptions =
+    FaceDetectionOptions.builder()
+        .setStaticImageMode(true)
+        .setModelSelection(0).build();
+FaceDetection faceDetection = new FaceDetection(this, faceDetectionOptions);
+
+// Connects MediaPipe Face Detection Solution to the user-defined ImageView
+// instance that allows users to have the custom drawing of the output landmarks
+// on it. See mediapipe/examples/android/solutions/facedetection/src/main/java/com/google/mediapipe/examples/facedetection/FaceDetectionResultImageView.java
+// as an example.
+FaceDetectionResultImageView imageView = new FaceDetectionResultImageView(this);
+faceDetection.setResultListener(
+    faceDetectionResult -> {
+      int width = faceDetectionResult.inputBitmap().getWidth();
+      int height = faceDetectionResult.inputBitmap().getHeight();
+      RelativeKeypoint noseTip =
+          FaceDetection.getFaceKeypoint(result, 0, FaceKeypoint.NOSE_TIP);
+      Log.i(
+          TAG,
+          String.format(
+              "MediaPipe Face Detection nose tip coordinates (pixel values): x=%f, y=%f",
+              noseTip.getX() * width, noseTip.getY() * height));
+      // Request canvas drawing.
+      imageView.setFaceDetectionResult(faceDetectionResult);
+      runOnUiThread(() -> imageView.update());
+    });
+faceDetection.setErrorListener(
+    (message, e) -> Log.e(TAG, "MediaPipe Face Detection error:" + message));
+
+// ActivityResultLauncher to get an image from the gallery as Bitmap.
+ActivityResultLauncher<Intent> imageGetter =
+    registerForActivityResult(
+        new ActivityResultContracts.StartActivityForResult(),
+        result -> {
+          Intent resultIntent = result.getData();
+          if (resultIntent != null && result.getResultCode() == RESULT_OK) {
+            Bitmap bitmap = null;
+            try {
+              bitmap =
+                  MediaStore.Images.Media.getBitmap(
+                      this.getContentResolver(), resultIntent.getData());
+              // Please also rotate the Bitmap based on its orientation.
+            } catch (IOException e) {
+              Log.e(TAG, "Bitmap reading error:" + e);
+            }
+            if (bitmap != null) {
+              faceDetection.send(bitmap);
+            }
+          }
+        });
+Intent gallery = new Intent(
+    Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
+imageGetter.launch(gallery);
+```
+
+#### Video Input
+
+```java
+// For video input and result rendering with OpenGL.
+FaceDetectionOptions faceDetectionOptions =
+    FaceDetectionOptions.builder()
+        .setStaticImageMode(false)
+        .setModelSelection(0).build();
+FaceDetection faceDetection = new FaceDetection(this, faceDetectionOptions);
+faceDetection.setErrorListener(
+    (message, e) -> Log.e(TAG, "MediaPipe Face Detection error:" + message));
+
+// Initializes a new VideoInput instance and connects it to MediaPipe Face Detection Solution.
+VideoInput videoInput = new VideoInput(this);
+videoInput.setNewFrameListener(
+    textureFrame -> faceDetection.send(textureFrame));
+
+// Initializes a new GlSurfaceView with a ResultGlRenderer<FaceDetectionResult> instance
+// that provides the interfaces to run user-defined OpenGL rendering code.
+// See mediapipe/examples/android/solutions/facedetection/src/main/java/com/google/mediapipe/examples/facedetection/FaceDetectionResultGlRenderer.java
+// as an example.
+SolutionGlSurfaceView<FaceDetectionResult> glSurfaceView =
+    new SolutionGlSurfaceView<>(
+        this, faceDetection.getGlContext(), faceDetection.getGlMajorVersion());
+glSurfaceView.setSolutionResultRenderer(new FaceDetectionResultGlRenderer());
+glSurfaceView.setRenderInputImage(true);
+
+faceDetection.setResultListener(
+    faceDetectionResult -> {
+      RelativeKeypoint noseTip =
+        FaceDetection.getFaceKeypoint(result, 0, FaceKeypoint.NOSE_TIP);
+      Log.i(
+          TAG,
+          String.format(
+              "MediaPipe Face Detection nose tip normalized coordinates (value range: [0, 1]): x=%f, y=%f",
+              noseTip.getX(), noseTip.getY()));
+      // Request GL rendering.
+      glSurfaceView.setRenderData(faceDetectionResult);
+      glSurfaceView.requestRender();
+    });
+
+ActivityResultLauncher<Intent> videoGetter =
+    registerForActivityResult(
+        new ActivityResultContracts.StartActivityForResult(),
+        result -> {
+          Intent resultIntent = result.getData();
+          if (resultIntent != null) {
+            if (result.getResultCode() == RESULT_OK) {
+              glSurfaceView.post(
+                  () ->
+                      videoInput.start(
+                          this,
+                          resultIntent.getData(),
+                          faceDetection.getGlContext(),
+                          glSurfaceView.getWidth(),
+                          glSurfaceView.getHeight()));
+            }
+          }
+        });
+Intent gallery =
+    new Intent(Intent.ACTION_PICK, MediaStore.Video.Media.INTERNAL_CONTENT_URI);
+videoGetter.launch(gallery);
+```
+
 ## Example Apps
 
 Please first see general instructions for

docs/solutions/face_mesh.md

@@ -111,6 +111,23 @@ You can find more information about the face landmark model in this
 :------------------------------------------------------------------------: |
 *Fig 2. Face landmarks: the red box indicates the cropped area as input to the landmark model, the red dots represent the 468 landmarks in 3D, and the green lines connecting landmarks illustrate the contours around the eyes, eyebrows, lips and the entire face.* |
 
+#### Attention Mesh Model
+
+In addition to the [Face Landmark Model](#face-landmark-model) we provide
+another model that applies
+[attention](https://en.wikipedia.org/wiki/Attention_(machine_learning)) to
+semantically meaningful face regions, and therefore predicting landmarks more
+accurately around lips, eyes and irises, at the expense of more compute. It
+enables applications like AR makeup and AR puppeteering.
+
+The attention mesh model can be selected in the Solution APIs via the
+[refine_landmarks](#refine_landmarks) option. You can also find more information
+about the model in this [paper](https://arxiv.org/abs/2006.10962).
+
+![attention_mesh_architecture.png](../images/attention_mesh_architecture.png) |
+:---------------------------------------------------------------------------: |
+*Fig 3. Attention Mesh: Overview of model architecture.*                      |
+
 ## Face Geometry Module
 
 The [Face Landmark Model](#face-landmark-model) performs a single-camera face landmark
@@ -145,8 +162,8 @@ be set freely, however for better results it is advised to set them as close to
 the *real physical camera parameters* as possible.
 
 ![face_geometry_metric_3d_space.gif](../images/face_geometry_metric_3d_space.gif) |
-:----------------------------------------------------------------------------: |
-*Fig 3. A visualization of multiple key elements in the Metric 3D space.*      |
+:-------------------------------------------------------------------------------: |
+*Fig 4. A visualization of multiple key elements in the Metric 3D space.*         |
 
 #### Canonical Face Model
 
@@ -210,7 +227,7 @@ The effect renderer is implemented as a MediaPipe
 
 | ![face_geometry_renderer.gif](../images/face_geometry_renderer.gif)     |
 | :---------------------------------------------------------------------: |
-| *Fig 4. An example of face effects rendered by the Face Geometry Effect Renderer.* |
+| *Fig 5. An example of face effects rendered by the Face Geometry Effect Renderer.* |
 
 ## Solution APIs
 
@@ -234,6 +251,12 @@ unrelated, images. Default to `false`.
 
 Maximum number of faces to detect. Default to `1`.
 
+#### refine_landmarks
+
+Whether to further refine the landmark coordinates around the eyes and lips, and
+output additional landmarks around the irises by applying the
+[Attention Mesh Model](#attention-mesh-model). Default to `false`.
+
 #### min_detection_confidence
 
 Minimum confidence value (`[0.0, 1.0]`) from the face detection model for the
@@ -271,6 +294,7 @@ Supported configuration options:
 
 *   [static_image_mode](#static_image_mode)
 *   [max_num_faces](#max_num_faces)
+*   [refine_landmarks](#refine_landmarks)
 *   [min_detection_confidence](#min_detection_confidence)
 *   [min_tracking_confidence](#min_tracking_confidence)
 
@@ -287,6 +311,7 @@ drawing_spec = mp_drawing.DrawingSpec(thickness=1, circle_radius=1)
 with mp_face_mesh.FaceMesh(
     static_image_mode=True,
     max_num_faces=1,
+    refine_landmarks=True,
     min_detection_confidence=0.5) as face_mesh:
   for idx, file in enumerate(IMAGE_FILES):
     image = cv2.imread(file)
@@ -313,12 +338,21 @@ with mp_face_mesh.FaceMesh(
           landmark_drawing_spec=None,
           connection_drawing_spec=mp_drawing_styles
           .get_default_face_mesh_contours_style())
+      mp_drawing.draw_landmarks(
+          image=annotated_image,
+          landmark_list=face_landmarks,
+          connections=mp_face_mesh.FACEMESH_IRISES,
+          landmark_drawing_spec=None,
+          connection_drawing_spec=mp_drawing_styles
+          .get_default_face_mesh_iris_connections_style())
     cv2.imwrite('/tmp/annotated_image' + str(idx) + '.png', annotated_image)
 
 # For webcam input:
 drawing_spec = mp_drawing.DrawingSpec(thickness=1, circle_radius=1)
 cap = cv2.VideoCapture(0)
 with mp_face_mesh.FaceMesh(
+    max_num_faces=1,
+    refine_landmarks=True,
     min_detection_confidence=0.5,
     min_tracking_confidence=0.5) as face_mesh:
   while cap.isOpened():
@@ -328,12 +362,10 @@ with mp_face_mesh.FaceMesh(
       # If loading a video, use 'break' instead of 'continue'.
       continue
 
-    # Flip the image horizontally for a later selfie-view display, and convert
-    # the BGR image to RGB.
-    image = cv2.cvtColor(cv2.flip(image, 1), cv2.COLOR_BGR2RGB)
     # To improve performance, optionally mark the image as not writeable to
     # pass by reference.
     image.flags.writeable = False
+    image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
     results = face_mesh.process(image)
 
     # Draw the face mesh annotations on the image.
@@ -355,7 +387,15 @@ with mp_face_mesh.FaceMesh(
             landmark_drawing_spec=None,
             connection_drawing_spec=mp_drawing_styles
             .get_default_face_mesh_contours_style())
-    cv2.imshow('MediaPipe FaceMesh', image)
+        mp_drawing.draw_landmarks(
+            image=image,
+            landmark_list=face_landmarks,
+            connections=mp_face_mesh.FACEMESH_IRISES,
+            landmark_drawing_spec=None,
+            connection_drawing_spec=mp_drawing_styles
+            .get_default_face_mesh_iris_connections_style())
+    # Flip the image horizontally for a selfie-view display.
+    cv2.imshow('MediaPipe Face Mesh', cv2.flip(image, 1))
     if cv2.waitKey(5) & 0xFF == 27:
       break
 cap.release()
@@ -370,6 +410,7 @@ and the following usage example.
 Supported configuration options:
 
 *   [maxNumFaces](#max_num_faces)
+*   [refineLandmarks](#refine_landmarks)
 *   [minDetectionConfidence](#min_detection_confidence)
 *   [minTrackingConfidence](#min_tracking_confidence)
 
@@ -410,8 +451,10 @@ function onResults(results) {
                      {color: '#C0C0C070', lineWidth: 1});
       drawConnectors(canvasCtx, landmarks, FACEMESH_RIGHT_EYE, {color: '#FF3030'});
       drawConnectors(canvasCtx, landmarks, FACEMESH_RIGHT_EYEBROW, {color: '#FF3030'});
+      drawConnectors(canvasCtx, landmarks, FACEMESH_RIGHT_IRIS, {color: '#FF3030'});
       drawConnectors(canvasCtx, landmarks, FACEMESH_LEFT_EYE, {color: '#30FF30'});
       drawConnectors(canvasCtx, landmarks, FACEMESH_LEFT_EYEBROW, {color: '#30FF30'});
+      drawConnectors(canvasCtx, landmarks, FACEMESH_LEFT_IRIS, {color: '#30FF30'});
       drawConnectors(canvasCtx, landmarks, FACEMESH_FACE_OVAL, {color: '#E0E0E0'});
       drawConnectors(canvasCtx, landmarks, FACEMESH_LIPS, {color: '#E0E0E0'});
     }
@@ -424,6 +467,7 @@ const faceMesh = new FaceMesh({locateFile: (file) => {
 }});
 faceMesh.setOptions({
   maxNumFaces: 1,
+  refineLandmarks: true,
   minDetectionConfidence: 0.5,
   minTrackingConfidence: 0.5
 });
@@ -444,7 +488,7 @@ camera.start();
 
 Please first follow general
 [instructions](../getting_started/android_solutions.md#integrate-mediapipe-android-solutions-api)
-to add MediaPipe Gradle dependencies, then try the FaceMash solution API in the
+to add MediaPipe Gradle dependencies, then try the Face Mesh Solution API in the
 companion
 [example Android Studio project](https://github.com/google/mediapipe/tree/master/mediapipe/examples/android/solutions/facemesh)
 following
@@ -455,6 +499,7 @@ Supported configuration options:
 
 *   [staticImageMode](#static_image_mode)
 *   [maxNumFaces](#max_num_faces)
+*   [refineLandmarks](#refine_landmarks)
 *   runOnGpu: Run the pipeline and the model inference on GPU or CPU.
 
 #### Camera Input
@@ -463,17 +508,18 @@ Supported configuration options:
 // For camera input and result rendering with OpenGL.
 FaceMeshOptions faceMeshOptions =
     FaceMeshOptions.builder()
-        .setMode(FaceMeshOptions.STREAMING_MODE)  // API soon to become
-        .setMaxNumFaces(1)                        // setStaticImageMode(false)
+        .setStaticImageMode(false)
+        .setRefineLandmarks(true)
+        .setMaxNumFaces(1)
         .setRunOnGpu(true).build();
-FaceMesh facemesh = new FaceMesh(this, faceMeshOptions);
-facemesh.setErrorListener(
+FaceMesh faceMesh = new FaceMesh(this, faceMeshOptions);
+faceMesh.setErrorListener(
     (message, e) -> Log.e(TAG, "MediaPipe Face Mesh error:" + message));
 
-// Initializes a new CameraInput instance and connects it to MediaPipe FaceMesh.
+// Initializes a new CameraInput instance and connects it to MediaPipe Face Mesh Solution.
 CameraInput cameraInput = new CameraInput(this);
 cameraInput.setNewFrameListener(
-    textureFrame -> facemesh.send(textureFrame));
+    textureFrame -> faceMesh.send(textureFrame));
 
 // Initializes a new GlSurfaceView with a ResultGlRenderer<FaceMeshResult> instance
 // that provides the interfaces to run user-defined OpenGL rendering code.
@@ -481,11 +527,11 @@ cameraInput.setNewFrameListener(
 // as an example.
 SolutionGlSurfaceView<FaceMeshResult> glSurfaceView =
     new SolutionGlSurfaceView<>(
-        this, facemesh.getGlContext(), facemesh.getGlMajorVersion());
+        this, faceMesh.getGlContext(), faceMesh.getGlMajorVersion());
 glSurfaceView.setSolutionResultRenderer(new FaceMeshResultGlRenderer());
 glSurfaceView.setRenderInputImage(true);
 
-facemesh.setResultListener(
+faceMesh.setResultListener(
     faceMeshResult -> {
       NormalizedLandmark noseLandmark =
           result.multiFaceLandmarks().get(0).getLandmarkList().get(1);
@@ -504,7 +550,7 @@ glSurfaceView.post(
     () ->
         cameraInput.start(
             this,
-            facemesh.getGlContext(),
+            faceMesh.getGlContext(),
             CameraInput.CameraFacing.FRONT,
             glSurfaceView.getWidth(),
             glSurfaceView.getHeight()));
@@ -516,17 +562,18 @@ glSurfaceView.post(
 // For reading images from gallery and drawing the output in an ImageView.
 FaceMeshOptions faceMeshOptions =
     FaceMeshOptions.builder()
-        .setMode(FaceMeshOptions.STATIC_IMAGE_MODE)  // API soon to become
-        .setMaxNumFaces(1)                           // setStaticImageMode(true)
+        .setStaticImageMode(true)
+        .setRefineLandmarks(true)
+        .setMaxNumFaces(1)
         .setRunOnGpu(true).build();
-FaceMesh facemesh = new FaceMesh(this, faceMeshOptions);
+FaceMesh faceMesh = new FaceMesh(this, faceMeshOptions);
 
-// Connects MediaPipe FaceMesh to the user-defined ImageView instance that allows
-// users to have the custom drawing of the output landmarks on it.
+// Connects MediaPipe Face Mesh Solution to the user-defined ImageView instance
+// that allows users to have the custom drawing of the output landmarks on it.
 // See mediapipe/examples/android/solutions/facemesh/src/main/java/com/google/mediapipe/examples/facemesh/FaceMeshResultImageView.java
 // as an example.
 FaceMeshResultImageView imageView = new FaceMeshResultImageView(this);
-facemesh.setResultListener(
+faceMesh.setResultListener(
     faceMeshResult -> {
       int width = faceMeshResult.inputBitmap().getWidth();
       int height = faceMeshResult.inputBitmap().getHeight();
@@ -541,7 +588,7 @@ facemesh.setResultListener(
       imageView.setFaceMeshResult(faceMeshResult);
       runOnUiThread(() -> imageView.update());
     });
-facemesh.setErrorListener(
+faceMesh.setErrorListener(
     (message, e) -> Log.e(TAG, "MediaPipe Face Mesh error:" + message));
 
 // ActivityResultLauncher to get an image from the gallery as Bitmap.
@@ -556,11 +603,12 @@ ActivityResultLauncher<Intent> imageGetter =
               bitmap =
                   MediaStore.Images.Media.getBitmap(
                       this.getContentResolver(), resultIntent.getData());
+              // Please also rotate the Bitmap based on its orientation.
             } catch (IOException e) {
               Log.e(TAG, "Bitmap reading error:" + e);
             }
             if (bitmap != null) {
-              facemesh.send(bitmap);
+              faceMesh.send(bitmap);
             }
           }
         });
@@ -575,17 +623,18 @@ imageGetter.launch(gallery);
 // For video input and result rendering with OpenGL.
 FaceMeshOptions faceMeshOptions =
     FaceMeshOptions.builder()
-        .setMode(FaceMeshOptions.STREAMING_MODE)  // API soon to become
-        .setMaxNumFaces(1)                        // setStaticImageMode(false)
+        .setStaticImageMode(false)
+        .setRefineLandmarks(true)
+        .setMaxNumFaces(1)
         .setRunOnGpu(true).build();
-FaceMesh facemesh = new FaceMesh(this, faceMeshOptions);
-facemesh.setErrorListener(
+FaceMesh faceMesh = new FaceMesh(this, faceMeshOptions);
+faceMesh.setErrorListener(
     (message, e) -> Log.e(TAG, "MediaPipe Face Mesh error:" + message));
 
-// Initializes a new VideoInput instance and connects it to MediaPipe FaceMesh.
+// Initializes a new VideoInput instance and connects it to MediaPipe Face Mesh Solution.
 VideoInput videoInput = new VideoInput(this);
 videoInput.setNewFrameListener(
-    textureFrame -> facemesh.send(textureFrame));
+    textureFrame -> faceMesh.send(textureFrame));
 
 // Initializes a new GlSurfaceView with a ResultGlRenderer<FaceMeshResult> instance
 // that provides the interfaces to run user-defined OpenGL rendering code.
@@ -593,11 +642,11 @@ videoInput.setNewFrameListener(
 // as an example.
 SolutionGlSurfaceView<FaceMeshResult> glSurfaceView =
     new SolutionGlSurfaceView<>(
-        this, facemesh.getGlContext(), facemesh.getGlMajorVersion());
+        this, faceMesh.getGlContext(), faceMesh.getGlMajorVersion());
 glSurfaceView.setSolutionResultRenderer(new FaceMeshResultGlRenderer());
 glSurfaceView.setRenderInputImage(true);
 
-facemesh.setResultListener(
+faceMesh.setResultListener(
     faceMeshResult -> {
       NormalizedLandmark noseLandmark =
           result.multiFaceLandmarks().get(0).getLandmarkList().get(1);
@@ -623,7 +672,7 @@ ActivityResultLauncher<Intent> videoGetter =
                       videoInput.start(
                           this,
                           resultIntent.getData(),
-                          facemesh.getGlContext(),
+                          faceMesh.getGlContext(),
                           glSurfaceView.getWidth(),
                           glSurfaceView.getHeight()));
             }

docs/solutions/hands.md

@@ -269,12 +269,10 @@ with mp_hands.Hands(
       # If loading a video, use 'break' instead of 'continue'.
       continue
 
-    # Flip the image horizontally for a later selfie-view display, and convert
-    # the BGR image to RGB.
-    image = cv2.cvtColor(cv2.flip(image, 1), cv2.COLOR_BGR2RGB)
     # To improve performance, optionally mark the image as not writeable to
     # pass by reference.
     image.flags.writeable = False
+    image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
     results = hands.process(image)
 
     # Draw the hand annotations on the image.
@@ -288,7 +286,8 @@ with mp_hands.Hands(
             mp_hands.HAND_CONNECTIONS,
             mp_drawing_styles.get_default_hand_landmarks_style(),
             mp_drawing_styles.get_default_hand_connections_style())
-    cv2.imshow('MediaPipe Hands', image)
+    # Flip the image horizontally for a selfie-view display.
+    cv2.imshow('MediaPipe Hands', cv2.flip(image, 1))
     if cv2.waitKey(5) & 0xFF == 27:
       break
 cap.release()
@@ -372,7 +371,7 @@ camera.start();
 
 Please first follow general
 [instructions](../getting_started/android_solutions.md#integrate-mediapipe-android-solutions-api)
-to add MediaPipe Gradle dependencies, then try the Hands solution API in the
+to add MediaPipe Gradle dependencies, then try the Hands Solution API in the
 companion
 [example Android Studio project](https://github.com/google/mediapipe/tree/master/mediapipe/examples/android/solutions/hands)
 following
@@ -391,14 +390,14 @@ Supported configuration options:
 // For camera input and result rendering with OpenGL.
 HandsOptions handsOptions =
     HandsOptions.builder()
-        .setMode(HandsOptions.STREAMING_MODE)  // API soon to become
-        .setMaxNumHands(1)                     // setStaticImageMode(false)
+        .setStaticImageMode(false)
+        .setMaxNumHands(1)
         .setRunOnGpu(true).build();
 Hands hands = new Hands(this, handsOptions);
 hands.setErrorListener(
     (message, e) -> Log.e(TAG, "MediaPipe Hands error:" + message));
 
-// Initializes a new CameraInput instance and connects it to MediaPipe Hands.
+// Initializes a new CameraInput instance and connects it to MediaPipe Hands Solution.
 CameraInput cameraInput = new CameraInput(this);
 cameraInput.setNewFrameListener(
     textureFrame -> hands.send(textureFrame));
@@ -444,13 +443,13 @@ glSurfaceView.post(
 // For reading images from gallery and drawing the output in an ImageView.
 HandsOptions handsOptions =
     HandsOptions.builder()
-        .setMode(HandsOptions.STATIC_IMAGE_MODE)  // API soon to become
-        .setMaxNumHands(1)                        // setStaticImageMode(true)
+        .setStaticImageMode(true)
+        .setMaxNumHands(1)
         .setRunOnGpu(true).build();
 Hands hands = new Hands(this, handsOptions);
 
-// Connects MediaPipe Hands to the user-defined ImageView instance that allows
-// users to have the custom drawing of the output landmarks on it.
+// Connects MediaPipe Hands Solution to the user-defined ImageView instance that
+// allows users to have the custom drawing of the output landmarks on it.
 // See mediapipe/examples/android/solutions/hands/src/main/java/com/google/mediapipe/examples/hands/HandsResultImageView.java
 // as an example.
 HandsResultImageView imageView = new HandsResultImageView(this);
@@ -484,6 +483,7 @@ ActivityResultLauncher<Intent> imageGetter =
               bitmap =
                   MediaStore.Images.Media.getBitmap(
                       this.getContentResolver(), resultIntent.getData());
+              // Please also rotate the Bitmap based on its orientation.
             } catch (IOException e) {
               Log.e(TAG, "Bitmap reading error:" + e);
             }
@@ -503,14 +503,14 @@ imageGetter.launch(gallery);
 // For video input and result rendering with OpenGL.
 HandsOptions handsOptions =
     HandsOptions.builder()
-        .setMode(HandsOptions.STREAMING_MODE)  // API soon to become
-        .setMaxNumHands(1)                     // setStaticImageMode(false)
+        .setStaticImageMode(false)
+        .setMaxNumHands(1)
         .setRunOnGpu(true).build();
 Hands hands = new Hands(this, handsOptions);
 hands.setErrorListener(
     (message, e) -> Log.e(TAG, "MediaPipe Hands error:" + message));
 
-// Initializes a new VideoInput instance and connects it to MediaPipe Hands.
+// Initializes a new VideoInput instance and connects it to MediaPipe Hands Solution.
 VideoInput videoInput = new VideoInput(this);
 videoInput.setNewFrameListener(
     textureFrame -> hands.send(textureFrame));

docs/solutions/holistic.md

@@ -147,6 +147,18 @@ If set to `true`, the solution filters pose landmarks across different input
 images to reduce jitter, but ignored if [static_image_mode](#static_image_mode)
 is also set to `true`. Default to `true`.
 
+#### enable_segmentation
+
+If set to `true`, in addition to the pose, face and hand landmarks the solution
+also generates the segmentation mask. Default to `false`.
+
+#### smooth_segmentation
+
+If set to `true`, the solution filters segmentation masks across different input
+images to reduce jitter. Ignored if [enable_segmentation](#enable_segmentation)
+is `false` or [static_image_mode](#static_image_mode) is `true`. Default to
+`true`.
+
 #### min_detection_confidence
 
 Minimum confidence value (`[0.0, 1.0]`) from the person-detection model for the
@@ -207,6 +219,15 @@ the camera. The magnitude of `z` uses roughly the same scale as `x`.
 A list of 21 hand landmarks on the right hand, in the same representation as
 [left_hand_landmarks](#left_hand_landmarks).
 
+#### segmentation_mask
+
+The output segmentation mask, predicted only when
+[enable_segmentation](#enable_segmentation) is set to `true`. The mask has the
+same width and height as the input image, and contains values in `[0.0, 1.0]`
+where `1.0` and `0.0` indicate high certainty of a "human" and "background"
+pixel respectively. Please refer to the platform-specific usage examples below
+for usage details.
+
 ### Python Solution API
 
 Please first follow general [instructions](../getting_started/python.md) to
@@ -218,6 +239,8 @@ Supported configuration options:
 *   [static_image_mode](#static_image_mode)
 *   [model_complexity](#model_complexity)
 *   [smooth_landmarks](#smooth_landmarks)
+*   [enable_segmentation](#enable_segmentation)
+*   [smooth_segmentation](#smooth_segmentation)
 *   [min_detection_confidence](#min_detection_confidence)
 *   [min_tracking_confidence](#min_tracking_confidence)
 
@@ -232,7 +255,8 @@ mp_holistic = mp.solutions.holistic
 IMAGE_FILES = []
 with mp_holistic.Holistic(
     static_image_mode=True,
-    model_complexity=2) as holistic:
+    model_complexity=2,
+    enable_segmentation=True) as holistic:
   for idx, file in enumerate(IMAGE_FILES):
     image = cv2.imread(file)
     image_height, image_width, _ = image.shape
@@ -245,8 +269,16 @@ with mp_holistic.Holistic(
           f'{results.pose_landmarks.landmark[mp_holistic.PoseLandmark.NOSE].x * image_width}, '
           f'{results.pose_landmarks.landmark[mp_holistic.PoseLandmark.NOSE].y * image_height})'
       )
-    # Draw pose, left and right hands, and face landmarks on the image.
+
     annotated_image = image.copy()
+    # Draw segmentation on the image.
+    # To improve segmentation around boundaries, consider applying a joint
+    # bilateral filter to "results.segmentation_mask" with "image".
+    condition = np.stack((results.segmentation_mask,) * 3, axis=-1) > 0.1
+    bg_image = np.zeros(image.shape, dtype=np.uint8)
+    bg_image[:] = BG_COLOR
+    annotated_image = np.where(condition, annotated_image, bg_image)
+    # Draw pose, left and right hands, and face landmarks on the image.
     mp_drawing.draw_landmarks(
         annotated_image,
         results.face_landmarks,
@@ -277,12 +309,10 @@ with mp_holistic.Holistic(
       # If loading a video, use 'break' instead of 'continue'.
       continue
 
-    # Flip the image horizontally for a later selfie-view display, and convert
-    # the BGR image to RGB.
-    image = cv2.cvtColor(cv2.flip(image, 1), cv2.COLOR_BGR2RGB)
     # To improve performance, optionally mark the image as not writeable to
     # pass by reference.
     image.flags.writeable = False
+    image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
     results = holistic.process(image)
 
     # Draw landmark annotation on the image.
@@ -301,7 +331,8 @@ with mp_holistic.Holistic(
         mp_holistic.POSE_CONNECTIONS,
         landmark_drawing_spec=mp_drawing_styles
         .get_default_pose_landmarks_style())
-    cv2.imshow('MediaPipe Holistic', image)
+    # Flip the image horizontally for a selfie-view display.
+    cv2.imshow('MediaPipe Holistic', cv2.flip(image, 1))
     if cv2.waitKey(5) & 0xFF == 27:
       break
 cap.release()
@@ -317,6 +348,8 @@ Supported configuration options:
 
 *   [modelComplexity](#model_complexity)
 *   [smoothLandmarks](#smooth_landmarks)
+*   [enableSegmentation](#enable_segmentation)
+*   [smoothSegmentation](#smooth_segmentation)
 *   [minDetectionConfidence](#min_detection_confidence)
 *   [minTrackingConfidence](#min_tracking_confidence)
 
@@ -349,8 +382,20 @@ const canvasCtx = canvasElement.getContext('2d');
 function onResults(results) {
   canvasCtx.save();
   canvasCtx.clearRect(0, 0, canvasElement.width, canvasElement.height);
+  canvasCtx.drawImage(results.segmentationMask, 0, 0,
+                      canvasElement.width, canvasElement.height);
+
+  // Only overwrite existing pixels.
+  canvasCtx.globalCompositeOperation = 'source-in';
+  canvasCtx.fillStyle = '#00FF00';
+  canvasCtx.fillRect(0, 0, canvasElement.width, canvasElement.height);
+
+  // Only overwrite missing pixels.
+  canvasCtx.globalCompositeOperation = 'destination-atop';
   canvasCtx.drawImage(
       results.image, 0, 0, canvasElement.width, canvasElement.height);
+
+  canvasCtx.globalCompositeOperation = 'source-over';
   drawConnectors(canvasCtx, results.poseLandmarks, POSE_CONNECTIONS,
                  {color: '#00FF00', lineWidth: 4});
   drawLandmarks(canvasCtx, results.poseLandmarks,
@@ -374,6 +419,8 @@ const holistic = new Holistic({locateFile: (file) => {
 holistic.setOptions({
   modelComplexity: 1,
   smoothLandmarks: true,
+  enableSegmentation: true,
+  smoothSegmentation: true,
   minDetectionConfidence: 0.5,
   minTrackingConfidence: 0.5
 });

docs/solutions/models.md

@@ -41,7 +41,10 @@ one over the other.
 *   Face landmark model:
     [TFLite model](https://github.com/google/mediapipe/tree/master/mediapipe/modules/face_landmark/face_landmark.tflite),
     [TF.js model](https://tfhub.dev/mediapipe/facemesh/1)
-*   [Model card](https://mediapipe.page.link/facemesh-mc)
+*   Face landmark model w/ attention (aka Attention Mesh):
+    [TFLite model](https://github.com/google/mediapipe/tree/master/mediapipe/modules/face_landmark/face_landmark_with_attention.tflite)
+*   [Model card](https://mediapipe.page.link/facemesh-mc),
+    [Model card (w/ attention)](https://mediapipe.page.link/attentionmesh-mc)
 
 ### [Iris](https://google.github.io/mediapipe/solutions/iris)
 

docs/solutions/objectron.md

@@ -338,11 +338,10 @@ with mp_objectron.Objectron(static_image_mode=False,
       # If loading a video, use 'break' instead of 'continue'.
       continue
 
-    # Convert the BGR image to RGB.
-    image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
     # To improve performance, optionally mark the image as not writeable to
     # pass by reference.
     image.flags.writeable = False
+    image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
     results = objectron.process(image)
 
     # Draw the box landmarks on the image.
@@ -354,7 +353,8 @@ with mp_objectron.Objectron(static_image_mode=False,
               image, detected_object.landmarks_2d, mp_objectron.BOX_CONNECTIONS)
             mp_drawing.draw_axis(image, detected_object.rotation,
                                  detected_object.translation)
-    cv2.imshow('MediaPipe Objectron', image)
+    # Flip the image horizontally for a selfie-view display.
+    cv2.imshow('MediaPipe Objectron', cv2.flip(image, 1))
     if cv2.waitKey(5) & 0xFF == 27:
       break
 cap.release()

docs/solutions/pose.md

@@ -316,12 +316,10 @@ with mp_pose.Pose(
       # If loading a video, use 'break' instead of 'continue'.
       continue
 
-    # Flip the image horizontally for a later selfie-view display, and convert
-    # the BGR image to RGB.
-    image = cv2.cvtColor(cv2.flip(image, 1), cv2.COLOR_BGR2RGB)
     # To improve performance, optionally mark the image as not writeable to
     # pass by reference.
     image.flags.writeable = False
+    image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
     results = pose.process(image)
 
     # Draw the pose annotation on the image.
@@ -332,7 +330,8 @@ with mp_pose.Pose(
         results.pose_landmarks,
         mp_pose.POSE_CONNECTIONS,
         landmark_drawing_spec=mp_drawing_styles.get_default_pose_landmarks_style())
-    cv2.imshow('MediaPipe Pose', image)
+    # Flip the image horizontally for a selfie-view display.
+    cv2.imshow('MediaPipe Pose', cv2.flip(image, 1))
     if cv2.waitKey(5) & 0xFF == 27:
       break
 cap.release()

mediapipe/calculators/core/flow_limiter_calculator.proto

@@ -30,7 +30,7 @@ message FlowLimiterCalculatorOptions {
   optional int32 max_in_flight = 1 [default = 1];
 
   // The maximum number of frames queued waiting for processing.
-  // The default value limits to 1 frame awaiting processing.
+  // The default value limits to 0 frames awaiting processing.
   optional int32 max_in_queue = 2 [default = 0];
 
   // The maximum time in microseconds to wait for a frame to finish processing.

mediapipe/calculators/core/split_vector_calculator.cc

@@ -80,4 +80,7 @@ typedef SplitVectorCalculator<mediapipe::ClassificationList, false>
     SplitClassificationListVectorCalculator;
 REGISTER_CALCULATOR(SplitClassificationListVectorCalculator);
 
+typedef SplitVectorCalculator<uint64_t, false> SplitUint64tVectorCalculator;
+REGISTER_CALCULATOR(SplitUint64tVectorCalculator);
+
 }  // namespace mediapipe

mediapipe/calculators/image/image_cropping_calculator.cc

@@ -480,8 +480,7 @@ RectSpec ImageCroppingCalculator::GetCropSpecs(const CalculatorContext* cc,
   if (cc->Inputs().HasTag(kRectTag)) {
     const auto& rect = cc->Inputs().Tag(kRectTag).Get<Rect>();
     // Only use the rect if it is valid.
-    if (rect.width() > 0 && rect.height() > 0 && rect.x_center() >= 0 &&
-        rect.y_center() >= 0) {
+    if (rect.width() > 0 && rect.height() > 0) {
       x_center = rect.x_center();
       y_center = rect.y_center();
       crop_width = rect.width();

mediapipe/calculators/image/image_transformation_calculator.cc

@@ -337,13 +337,16 @@ absl::Status ImageTransformationCalculator::Process(CalculatorContext* cc) {
       !cc->Inputs().Tag("FLIP_VERTICALLY").IsEmpty()) {
     flip_vertically_ = cc->Inputs().Tag("FLIP_VERTICALLY").Get<bool>();
   }
-  if (cc->Inputs().HasTag("OUTPUT_DIMENSIONS") &&
-      !cc->Inputs().Tag("OUTPUT_DIMENSIONS").IsEmpty()) {
+  if (cc->Inputs().HasTag("OUTPUT_DIMENSIONS")) {
+    if (cc->Inputs().Tag("OUTPUT_DIMENSIONS").IsEmpty()) {
+      return absl::OkStatus();
+    } else {
       const auto& image_size =
           cc->Inputs().Tag("OUTPUT_DIMENSIONS").Get<std::pair<int, int>>();
       output_width_ = image_size.first;
       output_height_ = image_size.second;
     }
+  }
 
   if (use_gpu_) {
 #if !MEDIAPIPE_DISABLE_GPU
@@ -506,6 +509,14 @@ absl::Status ImageTransformationCalculator::RenderGpu(CalculatorContext* cc) {
   ComputeOutputDimensions(input_width, input_height, &output_width,
                           &output_height);
 
+  if (scale_mode_ == mediapipe::ScaleMode_Mode_FILL_AND_CROP) {
+    const float scale =
+        std::min(static_cast<float>(output_width_) / input_width,
+                 static_cast<float>(output_height_) / input_height);
+    output_width = std::round(input_width * scale);
+    output_height = std::round(input_height * scale);
+  }
+
   if (cc->Outputs().HasTag("LETTERBOX_PADDING")) {
     auto padding = absl::make_unique<std::array<float, 4>>();
     ComputeOutputLetterboxPadding(input_width, input_height, output_width,

mediapipe/calculators/image/set_alpha_calculator.cc

@@ -53,7 +53,7 @@ enum { ATTRIB_VERTEX, ATTRIB_TEXTURE_POSITION, NUM_ATTRIBUTES };
 // The alpha channel can be set to a single value, or come from an image mask.
 // If the input image has an alpha channel, it will be updated.
 // If the input image doesn't have an alpha channel, one will be added.
-// Adding alpha channel to a Grayscale (single channel) input is not suported.
+// Adding alpha channel to a Grayscale (single channel) input is not supported.
 //
 // Inputs:
 //   One of the following two IMAGE tags:

mediapipe/calculators/util/BUILD

@@ -1384,6 +1384,32 @@ cc_library(
     alwayslink = 1,
 )
 
+mediapipe_proto_library(
+    name = "landmarks_refinement_calculator_proto",
+    srcs = ["landmarks_refinement_calculator.proto"],
+    deps = [
+        "//mediapipe/framework:calculator_options_proto",
+        "//mediapipe/framework:calculator_proto",
+    ],
+)
+
+cc_library(
+    name = "landmarks_refinement_calculator",
+    srcs = ["landmarks_refinement_calculator.cc"],
+    hdrs = ["landmarks_refinement_calculator.h"],
+    deps = [
+        ":landmarks_refinement_calculator_cc_proto",
+        "//mediapipe/framework:calculator_framework",
+        "//mediapipe/framework/api2:node",
+        "//mediapipe/framework/api2:port",
+        "//mediapipe/framework/formats:landmark_cc_proto",
+        "//mediapipe/framework/port:core_proto",
+        "//mediapipe/framework/port:ret_check",
+        "@com_google_absl//absl/memory",
+    ],
+    alwayslink = 1,
+)
+
 cc_test(
     name = "refine_landmarks_from_heatmap_calculator_test",
     srcs = ["refine_landmarks_from_heatmap_calculator_test.cc"],

mediapipe/calculators/util/landmarks_refinement_calculator.cc

@@ -0,0 +1,197 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "mediapipe/calculators/util/landmarks_refinement_calculator.h"
+
+#include <algorithm>
+#include <set>
+#include <utility>
+
+#include "absl/memory/memory.h"
+#include "mediapipe/calculators/util/landmarks_refinement_calculator.pb.h"
+#include "mediapipe/framework/api2/node.h"
+#include "mediapipe/framework/api2/port.h"
+#include "mediapipe/framework/calculator_framework.h"
+#include "mediapipe/framework/port/proto_ns.h"
+#include "mediapipe/framework/port/ret_check.h"
+
+namespace mediapipe {
+
+namespace api2 {
+
+namespace {
+
+absl::StatusOr<int> GetNumberOfRefinedLandmarks(
+    const proto_ns::RepeatedPtrField<
+        LandmarksRefinementCalculatorOptions::Refinement>& refinements) {
+  // Gather all used indexes.
+  std::set<int> idxs;
+  for (int i = 0; i < refinements.size(); ++i) {
+    const auto& refinement = refinements.Get(i);
+    for (int i = 0; i < refinement.indexes_mapping_size(); ++i) {
+      idxs.insert(refinement.indexes_mapping(i));
+    }
+  }
+
+  // Check that indxes start with 0 and there is no gaps between min and max
+  // indexes.
+  RET_CHECK(!idxs.empty())
+      << "There should be at least one landmark in indexes mapping";
+  int idxs_min = *idxs.begin();
+  int idxs_max = *idxs.rbegin();
+  int n_idxs = idxs.size();
+  RET_CHECK_EQ(idxs_min, 0)
+      << "Indexes are expected to start with 0 instead of " << idxs_min;
+  RET_CHECK_EQ(idxs_max, n_idxs - 1)
+      << "Indexes should have no gaps but " << idxs_max - n_idxs + 1
+      << " indexes are missing";
+
+  return n_idxs;
+}
+
+void RefineXY(const proto_ns::RepeatedField<int>& indexes_mapping,
+              const NormalizedLandmarkList& landmarks,
+              NormalizedLandmarkList* refined_landmarks) {
+  for (int i = 0; i < landmarks.landmark_size(); ++i) {
+    const auto& landmark = landmarks.landmark(i);
+    auto* refined_landmark =
+        refined_landmarks->mutable_landmark(indexes_mapping.Get(i));
+    refined_landmark->set_x(landmark.x());
+    refined_landmark->set_y(landmark.y());
+  }
+}
+
+float GetZAverage(const NormalizedLandmarkList& landmarks,
+                  const proto_ns::RepeatedField<int>& indexes) {
+  double z_sum = 0;
+  for (int i = 0; i < indexes.size(); ++i) {
+    z_sum += landmarks.landmark(indexes.Get(i)).z();
+  }
+  return z_sum / indexes.size();
+}
+
+void RefineZ(
+    const proto_ns::RepeatedField<int>& indexes_mapping,
+    const LandmarksRefinementCalculatorOptions::ZRefinement& z_refinement,
+    const NormalizedLandmarkList& landmarks,
+    NormalizedLandmarkList* refined_landmarks) {
+  if (z_refinement.has_none()) {
+    // Do nothing and keep Z that is already in refined landmarks.
+  } else if (z_refinement.has_copy()) {
+    for (int i = 0; i < landmarks.landmark_size(); ++i) {
+      refined_landmarks->mutable_landmark(indexes_mapping.Get(i))
+          ->set_z(landmarks.landmark(i).z());
+    }
+  } else if (z_refinement.has_assign_average()) {
+    const float z_average =
+        GetZAverage(*refined_landmarks,
+                    z_refinement.assign_average().indexes_for_average());
+    for (int i = 0; i < indexes_mapping.size(); ++i) {
+      refined_landmarks->mutable_landmark(indexes_mapping.Get(i))
+          ->set_z(z_average);
+    }
+  } else {
+    CHECK(false) << "Z refinement is either not specified or not supported";
+  }
+}
+
+}  // namespace
+
+class LandmarksRefinementCalculatorImpl
+    : public NodeImpl<LandmarksRefinementCalculator> {
+  absl::Status Open(CalculatorContext* cc) override {
+    options_ = cc->Options<LandmarksRefinementCalculatorOptions>();
+
+    // Validate refinements.
+    for (int i = 0; i < options_.refinement_size(); ++i) {
+      const auto& refinement = options_.refinement(i);
+      RET_CHECK_GT(refinement.indexes_mapping_size(), 0)
+          << "Refinement " << i << " has no indexes mapping";
+      RET_CHECK(refinement.has_z_refinement())
+          << "Refinement " << i << " has no Z refinement specified";
+      RET_CHECK(refinement.z_refinement().has_none() ^
+                refinement.z_refinement().has_copy() ^
+                refinement.z_refinement().has_assign_average())
+          << "Exactly one Z refinement should be specified";
+
+      const auto z_refinement = refinement.z_refinement();
+      if (z_refinement.has_assign_average()) {
+        RET_CHECK_GT(z_refinement.assign_average().indexes_for_average_size(),
+                     0)
+            << "When using assign average Z refinement at least one index for "
+               "averagin should be specified";
+      }
+    }
+
+    // Validate indexes mapping and get total number of refined landmarks.
+    ASSIGN_OR_RETURN(n_refined_landmarks_,
+                     GetNumberOfRefinedLandmarks(options_.refinement()));
+
+    // Validate that number of refinements and landmark streams is the same.
+    RET_CHECK_EQ(kLandmarks(cc).Count(), options_.refinement_size())
+        << "There are " << options_.refinement_size() << " refinements while "
+        << kLandmarks(cc).Count() << " landmark streams";
+
+    return absl::OkStatus();
+  }
+
+  absl::Status Process(CalculatorContext* cc) override {
+    // If any of the refinement landmarks is missing - refinement won't happen.
+    for (const auto& landmarks_stream : kLandmarks(cc)) {
+      if (landmarks_stream.IsEmpty()) {
+        return absl::OkStatus();
+      }
+    }
+
+    // Initialize refined landmarks list.
+    auto refined_landmarks = absl::make_unique<NormalizedLandmarkList>();
+    for (int i = 0; i < n_refined_landmarks_; ++i) {
+      refined_landmarks->add_landmark();
+    }
+
+    // Apply input landmarks to outpu refined landmarks in provided order.
+    for (int i = 0; i < kLandmarks(cc).Count(); ++i) {
+      const auto& landmarks = kLandmarks(cc)[i].Get();
+      const auto& refinement = options_.refinement(i);
+
+      // Check number of landmarks in mapping and stream are the same.
+      RET_CHECK_EQ(landmarks.landmark_size(), refinement.indexes_mapping_size())
+          << "There are " << landmarks.landmark_size()
+          << " refinement landmarks while mapping has "
+          << refinement.indexes_mapping_size();
+
+      // Refine X and Y.
+      RefineXY(refinement.indexes_mapping(), landmarks,
+               refined_landmarks.get());
+
+      // Refine Z.
+      RefineZ(refinement.indexes_mapping(), refinement.z_refinement(),
+              landmarks, refined_landmarks.get());
+
+      // Visibility and presence are not currently refined and are left as `0`.
+    }
+
+    kRefinedLandmarks(cc).Send(std::move(refined_landmarks));
+    return absl::OkStatus();
+  }
+
+ private:
+  LandmarksRefinementCalculatorOptions options_;
+  int n_refined_landmarks_ = 0;
+};
+
+MEDIAPIPE_NODE_IMPLEMENTATION(LandmarksRefinementCalculatorImpl);
+
+}  // namespace api2
+}  // namespace mediapipe

mediapipe/calculators/util/landmarks_refinement_calculator.h

@@ -0,0 +1,85 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef MEDIAPIPE_CALCULATORS_UTIL_LANDMARKS_REFINEMENT_CALCULATOR_H_
+#define MEDIAPIPE_CALCULATORS_UTIL_LANDMARKS_REFINEMENT_CALCULATOR_H_
+
+#include "mediapipe/framework/api2/node.h"
+#include "mediapipe/framework/api2/port.h"
+#include "mediapipe/framework/formats/landmark.pb.h"
+
+namespace mediapipe {
+
+namespace api2 {
+
+// A calculator to refine one set of landmarks with another.
+//
+// Inputs:
+//   LANDMARKS: Multiple NormalizedLandmarkList to use for
+//     refinement. They will be applied to the resulting REFINED_LANDMARKS in
+//     the provided order. Each list should be non empty and contain the same
+//     amount of landmarks as indexes in mapping. Number of lists should be the
+//     same as number of refinements in options.
+//
+// Outputs:
+//   REFINED_LANDMARKS: A NormalizedLandmarkList with refined landmarks. Number
+//     of produced landmarks is equal to to the maximum index mapping number in
+//     calculator options (calculator verifies that there are no gaps in the
+//     mapping).
+//
+// Examples config:
+//   node {
+//     calculator: "LandmarksRefinementCalculator"
+//     input_stream: "LANDMARKS:0:mesh_landmarks"
+//     input_stream: "LANDMARKS:1:lips_landmarks"
+//     input_stream: "LANDMARKS:2:left_eye_landmarks"
+//     input_stream: "LANDMARKS:3:right_eye_landmarks"
+//     output_stream: "REFINED_LANDMARKS:landmarks"
+//     options: {
+//       [mediapipe.LandmarksRefinementCalculatorOptions.ext] {
+//         refinement: {
+//           indexes_mapping: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
+//           z_refinement: { copy {} }
+//         }
+//         refinement: {
+//           indexes_mapping: [0, 1, 2, 3]
+//           z_refinement: { none {} }
+//         }
+//         refinement: {
+//           indexes_mapping: [4, 5]
+//           z_refinement: { none {} }
+//         }
+//         refinement: {
+//           indexes_mapping: [6, 7]
+//           z_refinement: { none {} }
+//         }
+//       }
+//     }
+//   }
+//
+class LandmarksRefinementCalculator : public NodeIntf {
+ public:
+  static constexpr Input<::mediapipe::NormalizedLandmarkList>::Multiple
+      kLandmarks{"LANDMARKS"};
+  static constexpr Output<::mediapipe::NormalizedLandmarkList>
+      kRefinedLandmarks{"REFINED_LANDMARKS"};
+
+  MEDIAPIPE_NODE_INTERFACE(LandmarksRefinementCalculator, kLandmarks,
+                           kRefinedLandmarks);
+};
+
+}  // namespace api2
+}  // namespace mediapipe
+
+#endif  // MEDIAPIPE_CALCULATORS_UTIL_LANDMARKS_REFINEMENT_CALCULATOR_H_

mediapipe/calculators/util/landmarks_refinement_calculator.proto

@@ -0,0 +1,71 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto2";
+
+package mediapipe;
+
+import "mediapipe/framework/calculator.proto";
+
+message LandmarksRefinementCalculatorOptions {
+  extend CalculatorOptions {
+    optional LandmarksRefinementCalculatorOptions ext = 381914658;
+  }
+
+  // Do nothing and keep those Z that are already present in the resulting set
+  // of landmarks.
+  message ZRefinementNone {}
+
+  // Simply copy Z values from the given set of landmarks to the resulting set
+  // of landmarks.
+  message ZRefinementCopy {}
+
+  // Calculate average of the specified set of landmarks in the resulting set
+  // and use it as Z for all given landmarks when assigning their values to the
+  // resulting set of landmarks.
+  message ZRefinementAssignAverage {
+    // Indexes of the resulting landmarks to use for average. Should be non
+    // empty.
+    repeated int32 indexes_for_average = 1;
+  }
+
+  // Specifies the set of instructions on assigning z value from the given set
+  // of landmarks to the resulting set of landmarks.
+  message ZRefinement {
+    // Exactly one Z refinement option should be specified.
+    oneof z_refinement_options {
+      ZRefinementNone none = 1;
+      ZRefinementCopy copy = 2;
+      ZRefinementAssignAverage assign_average = 3;
+    }
+  }
+
+  // Specifies the set of instructions of assigning values to the resulting set
+  // of landmarks.
+  message Refinement {
+    // Maps indexes of the given set of landmarks to indexes of the resulting
+    // set of landmarks. Should be non empty and contain the same amount of
+    // indexes as landmarks in the corresponding input stream.
+    repeated int32 indexes_mapping = 1;
+
+    // Z refinement instructions.
+    optional ZRefinement z_refinement = 2;
+  }
+
+  // Refinement instructions for every landmarks input stream. Applied in the
+  // same order as defined. Should be the same amount of refinements as landmark
+  // input streams in the calculator. Union of index mappings should start with
+  // 0 and cover a contineous range.
+  repeated Refinement refinement = 1;
+}

mediapipe/calculators/util/landmarks_to_render_data_calculator.cc

@@ -86,7 +86,7 @@ inline void GetMinMaxZ(const LandmarkListType& landmarks, float* z_min,
 }
 
 template <class LandmarkType>
-bool IsLandmarkVisibileAndPresent(const LandmarkType& landmark,
+bool IsLandmarkVisibleAndPresent(const LandmarkType& landmark,
                                  bool utilize_visibility,
                                  float visibility_threshold,
                                  bool utilize_presence,
@@ -153,12 +153,16 @@ void AddConnectionsWithDepth(const LandmarkListType& landmarks,
                              const Color& max_depth_line_color,
                              RenderData* render_data) {
   for (int i = 0; i < landmark_connections.size(); i += 2) {
+    if (landmark_connections[i] >= landmarks.landmark_size() ||
+        landmark_connections[i + 1] >= landmarks.landmark_size()) {
+      continue;
+    }
     const auto& ld0 = landmarks.landmark(landmark_connections[i]);
     const auto& ld1 = landmarks.landmark(landmark_connections[i + 1]);
-    if (!IsLandmarkVisibileAndPresent<LandmarkType>(
+    if (!IsLandmarkVisibleAndPresent<LandmarkType>(
             ld0, utilize_visibility, visibility_threshold, utilize_presence,
             presence_threshold) ||
-        !IsLandmarkVisibileAndPresent<LandmarkType>(
+        !IsLandmarkVisibleAndPresent<LandmarkType>(
             ld1, utilize_visibility, visibility_threshold, utilize_presence,
             presence_threshold)) {
       continue;
@@ -196,12 +200,16 @@ void AddConnections(const LandmarkListType& landmarks,
                     const Color& connection_color, float thickness,
                     bool normalized, RenderData* render_data) {
   for (int i = 0; i < landmark_connections.size(); i += 2) {
+    if (landmark_connections[i] >= landmarks.landmark_size() ||
+        landmark_connections[i + 1] >= landmarks.landmark_size()) {
+      continue;
+    }
     const auto& ld0 = landmarks.landmark(landmark_connections[i]);
     const auto& ld1 = landmarks.landmark(landmark_connections[i + 1]);
-    if (!IsLandmarkVisibileAndPresent<LandmarkType>(
+    if (!IsLandmarkVisibleAndPresent<LandmarkType>(
             ld0, utilize_visibility, visibility_threshold, utilize_presence,
             presence_threshold) ||
-        !IsLandmarkVisibileAndPresent<LandmarkType>(
+        !IsLandmarkVisibleAndPresent<LandmarkType>(
             ld1, utilize_visibility, visibility_threshold, utilize_presence,
             presence_threshold)) {
       continue;
@@ -317,7 +325,7 @@ absl::Status LandmarksToRenderDataCalculator::Process(CalculatorContext* cc) {
     for (int i = 0; i < landmarks.landmark_size(); ++i) {
       const Landmark& landmark = landmarks.landmark(i);
 
-      if (!IsLandmarkVisibileAndPresent<Landmark>(
+      if (!IsLandmarkVisibleAndPresent<Landmark>(
               landmark, options_.utilize_visibility(),
               options_.visibility_threshold(), options_.utilize_presence(),
               options_.presence_threshold())) {
@@ -363,7 +371,7 @@ absl::Status LandmarksToRenderDataCalculator::Process(CalculatorContext* cc) {
     for (int i = 0; i < landmarks.landmark_size(); ++i) {
       const NormalizedLandmark& landmark = landmarks.landmark(i);
 
-      if (!IsLandmarkVisibileAndPresent<NormalizedLandmark>(
+      if (!IsLandmarkVisibleAndPresent<NormalizedLandmark>(
               landmark, options_.utilize_visibility(),
               options_.visibility_threshold(), options_.utilize_presence(),
               options_.presence_threshold())) {

mediapipe/calculators/util/rect_transformation_calculator.cc

@@ -36,7 +36,7 @@ inline float NormalizeRadians(float angle) {
 }  // namespace
 
 // Performs geometric transformation to the input Rect or NormalizedRect,
-// correpsonding to input stream RECT or NORM_RECT respectively. When the input
+// corresponding to input stream RECT or NORM_RECT respectively. When the input
 // is NORM_RECT, an addition input stream IMAGE_SIZE is required, which is a
 // std::pair<int, int> representing the image width and height.
 //

mediapipe/examples/android/solutions/create_win_symlinks.bat

@@ -12,5 +12,12 @@ cd /d %~dp0
 cd facemesh\src\main
 rm res
 mklink /d res ..\..\..\res
+
+@rem for face detection example app.
+cd /d %~dp0
+cd facedetection\src\main
+rm res
+mklink /d res ..\..\..\res
+
 dir
 pause

mediapipe/examples/android/solutions/facedetection/build.gradle

@@ -0,0 +1,51 @@
+plugins {
+    id 'com.android.application'
+}
+
+android {
+    compileSdkVersion 30
+    buildToolsVersion "30.0.3"
+
+    defaultConfig {
+        applicationId "com.google.mediapipe.apps.facedetection"
+        minSdkVersion 21
+        targetSdkVersion 30
+        versionCode 1
+        versionName "1.0"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar', '*.aar'])
+    implementation 'androidx.appcompat:appcompat:1.3.0'
+    implementation 'com.google.android.material:material:1.3.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
+    implementation 'androidx.exifinterface:exifinterface:1.3.3'
+    testImplementation 'junit:junit:4.+'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
+    // MediaPipe Face Detection Solution components.
+    implementation 'com.google.mediapipe:solution-core:latest.release'
+    implementation 'com.google.mediapipe:facedetection:latest.release'
+    // MediaPipe deps
+    implementation 'com.google.flogger:flogger:0.6'
+    implementation 'com.google.flogger:flogger-system-backend:0.6'
+    implementation 'com.google.guava:guava:27.0.1-android'
+    implementation 'com.google.protobuf:protobuf-java:3.11.4'
+    // CameraX core library
+    def camerax_version = "1.0.0-beta10"
+    implementation "androidx.camera:camera-core:$camerax_version"
+    implementation "androidx.camera:camera-camera2:$camerax_version"
+    implementation "androidx.camera:camera-lifecycle:$camerax_version"
+}

mediapipe/examples/android/solutions/facedetection/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

mediapipe/examples/android/solutions/facedetection/src/main/AndroidManifest.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.google.mediapipe.examples.facedetection">
+
+  <uses-sdk
+      android:minSdkVersion="21"
+      android:targetSdkVersion="30" />
+
+  <!-- For loading images from gallery -->
+  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+  <!-- For using the camera -->
+  <uses-permission android:name="android.permission.CAMERA" />
+  <uses-feature android:name="android.hardware.camera" />
+
+  <application
+      android:allowBackup="true"
+      android:icon="@mipmap/ic_launcher"
+      android:label="MediaPipe Face Detection"
+      android:roundIcon="@mipmap/ic_launcher_round"
+      android:supportsRtl="true"
+      android:theme="@style/AppTheme">
+    <activity android:name=".MainActivity"
+              android:screenOrientation="portrait">
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN" />
+
+        <category android:name="android.intent.category.LAUNCHER" />
+      </intent-filter>
+    </activity>
+  </application>
+
+</manifest>

mediapipe/examples/android/solutions/facedetection/src/main/BUILD

@@ -0,0 +1,46 @@
+# Copyright 2021 The MediaPipe Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+licenses(["notice"])
+
+package(default_visibility = ["//visibility:private"])
+
+android_binary(
+    name = "facedetection",
+    srcs = glob(["**/*.java"]),
+    custom_package = "com.google.mediapipe.examples.facedetection",
+    manifest = "AndroidManifest.xml",
+    manifest_values = {
+        "applicationId": "com.google.mediapipe.examples.facedetection",
+    },
+    multidex = "native",
+    resource_files = ["//mediapipe/examples/android/solutions:resource_files"],
+    deps = [
+        "//mediapipe/framework/formats:detection_java_proto_lite",
+        "//mediapipe/framework/formats:location_data_java_proto_lite",
+        "//mediapipe/java/com/google/mediapipe/solutioncore:camera_input",
+        "//mediapipe/java/com/google/mediapipe/solutioncore:mediapipe_jni_lib",
+        "//mediapipe/java/com/google/mediapipe/solutioncore:solution_rendering",
+        "//mediapipe/java/com/google/mediapipe/solutioncore:video_input",
+        "//mediapipe/java/com/google/mediapipe/solutions/facedetection",
+        "//third_party:androidx_appcompat",
+        "//third_party:androidx_constraint_layout",
+        "//third_party:opencv",
+        "@maven//:androidx_activity_activity",
+        "@maven//:androidx_concurrent_concurrent_futures",
+        "@maven//:androidx_exifinterface_exifinterface",
+        "@maven//:androidx_fragment_fragment",
+        "@maven//:com_google_guava_guava",
+    ],
+)

mediapipe/examples/android/solutions/facedetection/src/main/java/com/google/mediapipe/examples/facedetection/FaceDetectionResultGlRenderer.java

@@ -0,0 +1,146 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.mediapipe.examples.facedetection;
+
+import android.opengl.GLES20;
+import com.google.mediapipe.formats.proto.DetectionProto.Detection;
+import com.google.mediapipe.solutioncore.ResultGlRenderer;
+import com.google.mediapipe.solutions.facedetection.FaceDetectionResult;
+import com.google.mediapipe.solutions.facedetection.FaceKeypoint;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.FloatBuffer;
+
+/** A custom implementation of {@link ResultGlRenderer} to render {@link FaceDetectionResult}. */
+public class FaceDetectionResultGlRenderer implements ResultGlRenderer<FaceDetectionResult> {
+  private static final String TAG = "FaceDetectionResultGlRenderer";
+
+  private static final float[] KEYPOINT_COLOR = new float[] {1f, 0f, 0f, 1f};
+  private static final float KEYPOINT_SIZE = 16f;
+  private static final float[] BBOX_COLOR = new float[] {0f, 1f, 0f, 1f};
+  private static final int BBOX_THICKNESS = 8;
+  private static final String VERTEX_SHADER =
+      "uniform mat4 uProjectionMatrix;\n"
+          + "uniform float uPointSize;\n"
+          + "attribute vec4 vPosition;\n"
+          + "void main() {\n"
+          + "  gl_Position = uProjectionMatrix * vPosition;\n"
+          + "  gl_PointSize = uPointSize;"
+          + "}";
+  private static final String FRAGMENT_SHADER =
+      "precision mediump float;\n"
+          + "uniform vec4 uColor;\n"
+          + "void main() {\n"
+          + "  gl_FragColor = uColor;\n"
+          + "}";
+  private int program;
+  private int positionHandle;
+  private int pointSizeHandle;
+  private int projectionMatrixHandle;
+  private int colorHandle;
+
+  private int loadShader(int type, String shaderCode) {
+    int shader = GLES20.glCreateShader(type);
+    GLES20.glShaderSource(shader, shaderCode);
+    GLES20.glCompileShader(shader);
+    return shader;
+  }
+
+  @Override
+  public void setupRendering() {
+    program = GLES20.glCreateProgram();
+    int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, VERTEX_SHADER);
+    int fragmentShader = loadShader(GLES20.GL_FRAGMENT_SHADER, FRAGMENT_SHADER);
+    GLES20.glAttachShader(program, vertexShader);
+    GLES20.glAttachShader(program, fragmentShader);
+    GLES20.glLinkProgram(program);
+    positionHandle = GLES20.glGetAttribLocation(program, "vPosition");
+    pointSizeHandle = GLES20.glGetUniformLocation(program, "uPointSize");
+    projectionMatrixHandle = GLES20.glGetUniformLocation(program, "uProjectionMatrix");
+    colorHandle = GLES20.glGetUniformLocation(program, "uColor");
+  }
+
+  @Override
+  public void renderResult(FaceDetectionResult result, float[] projectionMatrix) {
+    if (result == null) {
+      return;
+    }
+    GLES20.glUseProgram(program);
+    GLES20.glUniformMatrix4fv(projectionMatrixHandle, 1, false, projectionMatrix, 0);
+    GLES20.glUniform1f(pointSizeHandle, KEYPOINT_SIZE);
+    int numDetectedFaces = result.multiFaceDetections().size();
+    for (int i = 0; i < numDetectedFaces; ++i) {
+      drawDetection(result.multiFaceDetections().get(i));
+    }
+  }
+
+  /**
+   * Deletes the shader program.
+   *
+   * <p>This is only necessary if one wants to release the program while keeping the context around.
+   */
+  public void release() {
+    GLES20.glDeleteProgram(program);
+  }
+
+  private void drawDetection(Detection detection) {
+    if (!detection.hasLocationData()) {
+      return;
+    }
+    // Draw keypoints.
+    float[] points = new float[FaceKeypoint.NUM_KEY_POINTS * 2];
+    for (int i = 0; i < FaceKeypoint.NUM_KEY_POINTS; ++i) {
+      points[2 * i] = detection.getLocationData().getRelativeKeypoints(i).getX();
+      points[2 * i + 1] = detection.getLocationData().getRelativeKeypoints(i).getY();
+    }
+    GLES20.glUniform4fv(colorHandle, 1, KEYPOINT_COLOR, 0);
+    FloatBuffer vertexBuffer =
+        ByteBuffer.allocateDirect(points.length * 4)
+            .order(ByteOrder.nativeOrder())
+            .asFloatBuffer()
+            .put(points);
+    vertexBuffer.position(0);
+    GLES20.glEnableVertexAttribArray(positionHandle);
+    GLES20.glVertexAttribPointer(positionHandle, 2, GLES20.GL_FLOAT, false, 0, vertexBuffer);
+    GLES20.glDrawArrays(GLES20.GL_POINTS, 0, FaceKeypoint.NUM_KEY_POINTS);
+    if (!detection.getLocationData().hasRelativeBoundingBox()) {
+      return;
+    }
+    // Draw bounding box.
+    float left = detection.getLocationData().getRelativeBoundingBox().getXmin();
+    float top = detection.getLocationData().getRelativeBoundingBox().getYmin();
+    float right = left + detection.getLocationData().getRelativeBoundingBox().getWidth();
+    float bottom = top + detection.getLocationData().getRelativeBoundingBox().getHeight();
+    drawLine(top, left, top, right);
+    drawLine(bottom, left, bottom, right);
+    drawLine(top, left, bottom, left);
+    drawLine(top, right, bottom, right);
+  }
+
+  private void drawLine(float y1, float x1, float y2, float x2) {
+    GLES20.glUniform4fv(colorHandle, 1, BBOX_COLOR, 0);
+    GLES20.glLineWidth(BBOX_THICKNESS);
+    float[] vertex = {x1, y1, x2, y2};
+    FloatBuffer vertexBuffer =
+        ByteBuffer.allocateDirect(vertex.length * 4)
+            .order(ByteOrder.nativeOrder())
+            .asFloatBuffer()
+            .put(vertex);
+    vertexBuffer.position(0);
+    GLES20.glEnableVertexAttribArray(positionHandle);
+    GLES20.glVertexAttribPointer(positionHandle, 2, GLES20.GL_FLOAT, false, 0, vertexBuffer);
+    GLES20.glDrawArrays(GLES20.GL_LINES, 0, 2);
+  }
+}

mediapipe/examples/android/solutions/facedetection/src/main/java/com/google/mediapipe/examples/facedetection/FaceDetectionResultImageView.java

@@ -0,0 +1,108 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.mediapipe.examples.facedetection;
+
+import static java.lang.Math.min;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Matrix;
+import android.graphics.Paint;
+import androidx.appcompat.widget.AppCompatImageView;
+import com.google.mediapipe.formats.proto.DetectionProto.Detection;
+import com.google.mediapipe.solutions.facedetection.FaceDetectionResult;
+import com.google.mediapipe.solutions.facedetection.FaceKeypoint;
+
+/** An ImageView implementation for displaying {@link FaceDetectionResult}. */
+public class FaceDetectionResultImageView extends AppCompatImageView {
+  private static final String TAG = "FaceDetectionResultImageView";
+
+  private static final int KEYPOINT_COLOR = Color.RED;
+  private static final int KEYPOINT_RADIUS = 15;
+  private static final int BBOX_COLOR = Color.GREEN;
+  private static final int BBOX_THICKNESS = 10;
+  private Bitmap latest;
+
+  public FaceDetectionResultImageView(Context context) {
+    super(context);
+    setScaleType(AppCompatImageView.ScaleType.FIT_CENTER);
+  }
+
+  /**
+   * Sets a {@link FaceDetectionResult} to render.
+   *
+   * @param result a {@link FaceDetectionResult} object that contains the solution outputs and the
+   *     input {@link Bitmap}.
+   */
+  public void setFaceDetectionResult(FaceDetectionResult result) {
+    if (result == null) {
+      return;
+    }
+    Bitmap bmInput = result.inputBitmap();
+    int width = bmInput.getWidth();
+    int height = bmInput.getHeight();
+    latest = Bitmap.createBitmap(width, height, bmInput.getConfig());
+    Canvas canvas = new Canvas(latest);
+
+    canvas.drawBitmap(bmInput, new Matrix(), null);
+    int numDetectedFaces = result.multiFaceDetections().size();
+    for (int i = 0; i < numDetectedFaces; ++i) {
+      drawDetectionOnCanvas(result.multiFaceDetections().get(i), canvas, width, height);
+    }
+  }
+
+  /** Updates the image view with the latest {@link FaceDetectionResult}. */
+  public void update() {
+    postInvalidate();
+    if (latest != null) {
+      setImageBitmap(latest);
+    }
+  }
+
+  private void drawDetectionOnCanvas(Detection detection, Canvas canvas, int width, int height) {
+    if (!detection.hasLocationData()) {
+      return;
+    }
+    // Draw keypoints.
+    Paint keypointPaint = new Paint();
+    keypointPaint.setColor(KEYPOINT_COLOR);
+    for (int i = 0; i < FaceKeypoint.NUM_KEY_POINTS; ++i) {
+      int xPixel =
+          min(
+              (int) (detection.getLocationData().getRelativeKeypoints(i).getX() * width),
+              width - 1);
+      int yPixel =
+          min(
+              (int) (detection.getLocationData().getRelativeKeypoints(i).getY() * height),
+              height - 1);
+      canvas.drawCircle(xPixel, yPixel, KEYPOINT_RADIUS, keypointPaint);
+    }
+    if (!detection.getLocationData().hasRelativeBoundingBox()) {
+      return;
+    }
+    // Draw bounding box.
+    Paint bboxPaint = new Paint();
+    bboxPaint.setColor(BBOX_COLOR);
+    bboxPaint.setStyle(Paint.Style.STROKE);
+    bboxPaint.setStrokeWidth(BBOX_THICKNESS);
+    float left = detection.getLocationData().getRelativeBoundingBox().getXmin() * width;
+    float top = detection.getLocationData().getRelativeBoundingBox().getYmin() * height;
+    float right = left + detection.getLocationData().getRelativeBoundingBox().getWidth() * width;
+    float bottom = top + detection.getLocationData().getRelativeBoundingBox().getHeight() * height;
+    canvas.drawRect(left, top, right, bottom, bboxPaint);
+  }
+}

mediapipe/examples/android/solutions/facedetection/src/main/java/com/google/mediapipe/examples/facedetection/MainActivity.java

@@ -0,0 +1,341 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.mediapipe.examples.facedetection;
+
+import android.content.Intent;
+import android.graphics.Bitmap;
+import android.graphics.Matrix;
+import android.os.Bundle;
+import android.provider.MediaStore;
+import androidx.appcompat.app.AppCompatActivity;
+import android.util.Log;
+import android.view.View;
+import android.widget.Button;
+import android.widget.FrameLayout;
+import androidx.activity.result.ActivityResultLauncher;
+import androidx.activity.result.contract.ActivityResultContracts;
+import androidx.exifinterface.media.ExifInterface;
+// ContentResolver dependency
+import com.google.mediapipe.formats.proto.LocationDataProto.LocationData.RelativeKeypoint;
+import com.google.mediapipe.solutioncore.CameraInput;
+import com.google.mediapipe.solutioncore.SolutionGlSurfaceView;
+import com.google.mediapipe.solutioncore.VideoInput;
+import com.google.mediapipe.solutions.facedetection.FaceDetection;
+import com.google.mediapipe.solutions.facedetection.FaceDetectionOptions;
+import com.google.mediapipe.solutions.facedetection.FaceDetectionResult;
+import com.google.mediapipe.solutions.facedetection.FaceKeypoint;
+import java.io.IOException;
+import java.io.InputStream;
+
+/** Main activity of MediaPipe Face Detection app. */
+public class MainActivity extends AppCompatActivity {
+  private static final String TAG = "MainActivity";
+
+  private FaceDetection faceDetection;
+
+  private enum InputSource {
+    UNKNOWN,
+    IMAGE,
+    VIDEO,
+    CAMERA,
+  }
+  private InputSource inputSource = InputSource.UNKNOWN;
+
+  // Image demo UI and image loader components.
+  private ActivityResultLauncher<Intent> imageGetter;
+  private FaceDetectionResultImageView imageView;
+  // Video demo UI and video loader components.
+  private VideoInput videoInput;
+  private ActivityResultLauncher<Intent> videoGetter;
+  // Live camera demo UI and camera components.
+  private CameraInput cameraInput;
+
+  private SolutionGlSurfaceView<FaceDetectionResult> glSurfaceView;
+
+  @Override
+  protected void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    setContentView(R.layout.activity_main);
+    setupStaticImageDemoUiComponents();
+    setupVideoDemoUiComponents();
+    setupLiveDemoUiComponents();
+  }
+
+  @Override
+  protected void onResume() {
+    super.onResume();
+    if (inputSource == InputSource.CAMERA) {
+      // Restarts the camera and the opengl surface rendering.
+      cameraInput = new CameraInput(this);
+      cameraInput.setNewFrameListener(textureFrame -> faceDetection.send(textureFrame));
+      glSurfaceView.post(this::startCamera);
+      glSurfaceView.setVisibility(View.VISIBLE);
+    } else if (inputSource == InputSource.VIDEO) {
+      videoInput.resume();
+    }
+  }
+
+  @Override
+  protected void onPause() {
+    super.onPause();
+    if (inputSource == InputSource.CAMERA) {
+      glSurfaceView.setVisibility(View.GONE);
+      cameraInput.close();
+    } else if (inputSource == InputSource.VIDEO) {
+      videoInput.pause();
+    }
+  }
+
+  /** Sets up the UI components for the static image demo. */
+  private void setupStaticImageDemoUiComponents() {
+    // The Intent to access gallery and read images as bitmap.
+    imageGetter =
+        registerForActivityResult(
+            new ActivityResultContracts.StartActivityForResult(),
+            result -> {
+              Intent resultIntent = result.getData();
+              if (resultIntent != null) {
+                if (result.getResultCode() == RESULT_OK) {
+                  Bitmap bitmap = null;
+                  try {
+                    bitmap =
+                        MediaStore.Images.Media.getBitmap(
+                            this.getContentResolver(), resultIntent.getData());
+                  } catch (IOException e) {
+                    Log.e(TAG, "Bitmap reading error:" + e);
+                  }
+                  try {
+                    InputStream imageData =
+                        this.getContentResolver().openInputStream(resultIntent.getData());
+                    int orientation =
+                        new ExifInterface(imageData)
+                            .getAttributeInt(
+                                ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
+                    if (orientation != ExifInterface.ORIENTATION_NORMAL) {
+                      Matrix matrix = new Matrix();
+                      switch (orientation) {
+                        case ExifInterface.ORIENTATION_ROTATE_90:
+                          matrix.postRotate(90);
+                          break;
+                        case ExifInterface.ORIENTATION_ROTATE_180:
+                          matrix.postRotate(180);
+                          break;
+                        case ExifInterface.ORIENTATION_ROTATE_270:
+                          matrix.postRotate(270);
+                          break;
+                        default:
+                          matrix.postRotate(0);
+                      }
+                      bitmap =
+                          Bitmap.createBitmap(
+                              bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
+                    }
+                  } catch (IOException e) {
+                    Log.e(TAG, "Bitmap rotation error:" + e);
+                  }
+                  if (bitmap != null) {
+                    faceDetection.send(bitmap);
+                  }
+                }
+              }
+            });
+    Button loadImageButton = findViewById(R.id.button_load_picture);
+    loadImageButton.setOnClickListener(
+        v -> {
+          if (inputSource != InputSource.IMAGE) {
+            stopCurrentPipeline();
+            setupStaticImageModePipeline();
+          }
+          // Reads images from gallery.
+          Intent gallery =
+              new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);
+          imageGetter.launch(gallery);
+        });
+    imageView = new FaceDetectionResultImageView(this);
+  }
+
+  /** Sets up core workflow for static image mode. */
+  private void setupStaticImageModePipeline() {
+    this.inputSource = InputSource.IMAGE;
+    // Initializes a new MediaPipe Face Detection solution instance in the static image mode.
+    faceDetection =
+        new FaceDetection(
+            this,
+            FaceDetectionOptions.builder()
+                .setStaticImageMode(true)
+                .setModelSelection(0)
+                .setMinDetectionConfidence(0.5f)
+                .build());
+
+    // Connects MediaPipe Face Detection solution to the user-defined FaceDetectionResultImageView.
+    faceDetection.setResultListener(
+        faceDetectionResult -> {
+          logNoseTipKeypoint(faceDetectionResult, /*faceIndex=*/ 0, /*showPixelValues=*/ true);
+          imageView.setFaceDetectionResult(faceDetectionResult);
+          runOnUiThread(() -> imageView.update());
+        });
+    faceDetection.setErrorListener(
+        (message, e) -> Log.e(TAG, "MediaPipe Face Detection error:" + message));
+
+    // Updates the preview layout.
+    FrameLayout frameLayout = findViewById(R.id.preview_display_layout);
+    frameLayout.removeAllViewsInLayout();
+    imageView.setImageDrawable(null);
+    frameLayout.addView(imageView);
+    imageView.setVisibility(View.VISIBLE);
+  }
+
+  /** Sets up the UI components for the video demo. */
+  private void setupVideoDemoUiComponents() {
+    // The Intent to access gallery and read a video file.
+    videoGetter =
+        registerForActivityResult(
+            new ActivityResultContracts.StartActivityForResult(),
+            result -> {
+              Intent resultIntent = result.getData();
+              if (resultIntent != null) {
+                if (result.getResultCode() == RESULT_OK) {
+                  glSurfaceView.post(
+                      () ->
+                          videoInput.start(
+                              this,
+                              resultIntent.getData(),
+                              faceDetection.getGlContext(),
+                              glSurfaceView.getWidth(),
+                              glSurfaceView.getHeight()));
+                }
+              }
+            });
+    Button loadVideoButton = findViewById(R.id.button_load_video);
+    loadVideoButton.setOnClickListener(
+        v -> {
+          stopCurrentPipeline();
+          setupStreamingModePipeline(InputSource.VIDEO);
+          // Reads video from gallery.
+          Intent gallery =
+              new Intent(Intent.ACTION_PICK, MediaStore.Video.Media.INTERNAL_CONTENT_URI);
+          videoGetter.launch(gallery);
+        });
+  }
+
+  /** Sets up the UI components for the live demo with camera input. */
+  private void setupLiveDemoUiComponents() {
+    Button startCameraButton = findViewById(R.id.button_start_camera);
+    startCameraButton.setOnClickListener(
+        v -> {
+          if (inputSource == InputSource.CAMERA) {
+            return;
+          }
+          stopCurrentPipeline();
+          setupStreamingModePipeline(InputSource.CAMERA);
+        });
+  }
+
+  /** Sets up core workflow for streaming mode. */
+  private void setupStreamingModePipeline(InputSource inputSource) {
+    this.inputSource = inputSource;
+    // Initializes a new MediaPipe Face Detection solution instance in the streaming mode.
+    faceDetection =
+        new FaceDetection(
+            this,
+            FaceDetectionOptions.builder().setStaticImageMode(false).setModelSelection(0).build());
+    faceDetection.setErrorListener(
+        (message, e) -> Log.e(TAG, "MediaPipe Face Detection error:" + message));
+
+    if (inputSource == InputSource.CAMERA) {
+      cameraInput = new CameraInput(this);
+      cameraInput.setNewFrameListener(textureFrame -> faceDetection.send(textureFrame));
+    } else if (inputSource == InputSource.VIDEO) {
+      videoInput = new VideoInput(this);
+      videoInput.setNewFrameListener(textureFrame -> faceDetection.send(textureFrame));
+    }
+
+    // Initializes a new Gl surface view with a user-defined FaceDetectionResultGlRenderer.
+    glSurfaceView =
+        new SolutionGlSurfaceView<>(
+            this, faceDetection.getGlContext(), faceDetection.getGlMajorVersion());
+    glSurfaceView.setSolutionResultRenderer(new FaceDetectionResultGlRenderer());
+    glSurfaceView.setRenderInputImage(true);
+    faceDetection.setResultListener(
+        faceDetectionResult -> {
+          logNoseTipKeypoint(faceDetectionResult, /*faceIndex=*/ 0, /*showPixelValues=*/ false);
+          glSurfaceView.setRenderData(faceDetectionResult);
+          glSurfaceView.requestRender();
+        });
+
+    // The runnable to start camera after the gl surface view is attached.
+    // For video input source, videoInput.start() will be called when the video uri is available.
+    if (inputSource == InputSource.CAMERA) {
+      glSurfaceView.post(this::startCamera);
+    }
+
+    // Updates the preview layout.
+    FrameLayout frameLayout = findViewById(R.id.preview_display_layout);
+    imageView.setVisibility(View.GONE);
+    frameLayout.removeAllViewsInLayout();
+    frameLayout.addView(glSurfaceView);
+    glSurfaceView.setVisibility(View.VISIBLE);
+    frameLayout.requestLayout();
+  }
+
+  private void startCamera() {
+    cameraInput.start(
+        this,
+        faceDetection.getGlContext(),
+        CameraInput.CameraFacing.FRONT,
+        glSurfaceView.getWidth(),
+        glSurfaceView.getHeight());
+  }
+
+  private void stopCurrentPipeline() {
+    if (cameraInput != null) {
+      cameraInput.setNewFrameListener(null);
+      cameraInput.close();
+    }
+    if (videoInput != null) {
+      videoInput.setNewFrameListener(null);
+      videoInput.close();
+    }
+    if (glSurfaceView != null) {
+      glSurfaceView.setVisibility(View.GONE);
+    }
+    if (faceDetection != null) {
+      faceDetection.close();
+    }
+  }
+
+  private void logNoseTipKeypoint(
+      FaceDetectionResult result, int faceIndex, boolean showPixelValues) {
+    RelativeKeypoint noseTip =
+        FaceDetection.getFaceKeypoint(result, faceIndex, FaceKeypoint.NOSE_TIP);
+    // For Bitmaps, show the pixel values. For texture inputs, show the normalized coordinates.
+    if (showPixelValues) {
+      int width = result.inputBitmap().getWidth();
+      int height = result.inputBitmap().getHeight();
+      Log.i(
+          TAG,
+          String.format(
+              "MediaPipe Face Detection nose tip coordinates (pixel values): x=%f, y=%f",
+              noseTip.getX() * width, noseTip.getY() * height));
+    } else {
+      Log.i(
+          TAG,
+          String.format(
+              "MediaPipe Face Detection nose tip normalized coordinates (value range: [0, 1]):"
+                  + " x=%f, y=%f",
+              noseTip.getX(), noseTip.getY()));
+    }
+  }
+}

mediapipe/examples/android/solutions/facedetection/src/main/res

@@ -0,0 +1 @@
+../../../res

mediapipe/examples/android/solutions/facemesh/build.gradle

@@ -31,15 +31,16 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.3.0'
     implementation 'com.google.android.material:material:1.3.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
+    implementation 'androidx.exifinterface:exifinterface:1.3.3'
     testImplementation 'junit:junit:4.+'
     androidTestImplementation 'androidx.test.ext:junit:1.1.2'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
-    // MediaPipe hands solution API and solution-core.
+    // MediaPipe Face Mesh Solution components.
     implementation 'com.google.mediapipe:solution-core:latest.release'
     implementation 'com.google.mediapipe:facemesh:latest.release'
     // MediaPipe deps
-    implementation 'com.google.flogger:flogger:latest.release'
-    implementation 'com.google.flogger:flogger-system-backend:latest.release'
+    implementation 'com.google.flogger:flogger:0.6'
+    implementation 'com.google.flogger:flogger-system-backend:0.6'
     implementation 'com.google.guava:guava:27.0.1-android'
     implementation 'com.google.protobuf:protobuf-java:3.11.4'
     // CameraX core library

mediapipe/examples/android/solutions/facemesh/src/main/BUILD

@@ -38,6 +38,7 @@ android_binary(
         "//third_party:opencv",
         "@maven//:androidx_activity_activity",
         "@maven//:androidx_concurrent_concurrent_futures",
+        "@maven//:androidx_exifinterface_exifinterface",
         "@maven//:androidx_fragment_fragment",
         "@maven//:com_google_guava_guava",
     ],

mediapipe/examples/android/solutions/facemesh/src/main/java/com/google/mediapipe/examples/facemesh/FaceMeshResultGlRenderer.java

@@ -15,11 +15,10 @@
 package com.google.mediapipe.examples.facemesh;
 
 import android.opengl.GLES20;
-import android.opengl.Matrix;
 import com.google.common.collect.ImmutableSet;
 import com.google.mediapipe.formats.proto.LandmarkProto.NormalizedLandmark;
-import com.google.mediapipe.solutioncore.ResultGlBoundary;
 import com.google.mediapipe.solutioncore.ResultGlRenderer;
+import com.google.mediapipe.solutions.facemesh.FaceMesh;
 import com.google.mediapipe.solutions.facemesh.FaceMeshConnections;
 import com.google.mediapipe.solutions.facemesh.FaceMeshResult;
 import java.nio.ByteBuffer;
@@ -27,7 +26,7 @@ import java.nio.ByteOrder;
 import java.nio.FloatBuffer;
 import java.util.List;
 
-/** A custom implementation of {@link ResultGlRenderer} to render MediaPope FaceMesh results. */
+/** A custom implementation of {@link ResultGlRenderer} to render {@link FaceMeshResult}. */
 public class FaceMeshResultGlRenderer implements ResultGlRenderer<FaceMeshResult> {
   private static final String TAG = "FaceMeshResultGlRenderer";
 
@@ -46,10 +45,10 @@ public class FaceMeshResultGlRenderer implements ResultGlRenderer<FaceMeshResult
   private static final float[] LIPS_COLOR = new float[] {0.9f, 0.9f, 0.9f, 1f};
   private static final int LIPS_THICKNESS = 8;
   private static final String VERTEX_SHADER =
-      "uniform mat4 uTransformMatrix;\n"
+      "uniform mat4 uProjectionMatrix;\n"
           + "attribute vec4 vPosition;\n"
           + "void main() {\n"
-          + "  gl_Position = uTransformMatrix * vPosition;\n"
+          + "  gl_Position = uProjectionMatrix * vPosition;\n"
           + "}";
   private static final String FRAGMENT_SHADER =
       "precision mediump float;\n"
@@ -59,9 +58,8 @@ public class FaceMeshResultGlRenderer implements ResultGlRenderer<FaceMeshResult
           + "}";
   private int program;
   private int positionHandle;
-  private int transformMatrixHandle;
+  private int projectionMatrixHandle;
   private int colorHandle;
-  private final float[] transformMatrix = new float[16];
 
   private int loadShader(int type, String shaderCode) {
     int shader = GLES20.glCreateShader(type);
@@ -79,28 +77,17 @@ public class FaceMeshResultGlRenderer implements ResultGlRenderer<FaceMeshResult
     GLES20.glAttachShader(program, fragmentShader);
     GLES20.glLinkProgram(program);
     positionHandle = GLES20.glGetAttribLocation(program, "vPosition");
-    transformMatrixHandle = GLES20.glGetUniformLocation(program, "uTransformMatrix");
+    projectionMatrixHandle = GLES20.glGetUniformLocation(program, "uProjectionMatrix");
     colorHandle = GLES20.glGetUniformLocation(program, "uColor");
   }
 
   @Override
-  public void renderResult(FaceMeshResult result, ResultGlBoundary boundary) {
+  public void renderResult(FaceMeshResult result, float[] projectionMatrix) {
     if (result == null) {
       return;
     }
     GLES20.glUseProgram(program);
-    // Sets the transform matrix to align the result rendering with the scaled output texture.
-    // Also flips the rendering vertically since OpenGL assumes the coordinate origin is at the
-    // bottom-left corner, whereas MediaPipe landmark data assumes the coordinate origin is at the
-    // top-left corner.
-    Matrix.setIdentityM(transformMatrix, 0);
-    Matrix.scaleM(
-        transformMatrix,
-        0,
-        2 / (boundary.right() - boundary.left()),
-        -2 / (boundary.top() - boundary.bottom()),
-        1.0f);
-    GLES20.glUniformMatrix4fv(transformMatrixHandle, 1, false, transformMatrix, 0);
+    GLES20.glUniformMatrix4fv(projectionMatrixHandle, 1, false, projectionMatrix, 0);
 
     int numFaces = result.multiFaceLandmarks().size();
     for (int i = 0; i < numFaces; ++i) {
@@ -126,7 +113,7 @@ public class FaceMeshResultGlRenderer implements ResultGlRenderer<FaceMeshResult
           LEFT_EYE_THICKNESS);
       drawLandmarks(
           result.multiFaceLandmarks().get(i).getLandmarkList(),
-          FaceMeshConnections.FACEMESH_LEFT_EYEBR0W,
+          FaceMeshConnections.FACEMESH_LEFT_EYEBROW,
           LEFT_EYEBROW_COLOR,
           LEFT_EYEBROW_THICKNESS);
       drawLandmarks(
@@ -139,11 +126,24 @@ public class FaceMeshResultGlRenderer implements ResultGlRenderer<FaceMeshResult
           FaceMeshConnections.FACEMESH_LIPS,
           LIPS_COLOR,
           LIPS_THICKNESS);
+      if (result.multiFaceLandmarks().get(i).getLandmarkCount()
+          == FaceMesh.FACEMESH_NUM_LANDMARKS_WITH_IRISES) {
+        drawLandmarks(
+            result.multiFaceLandmarks().get(i).getLandmarkList(),
+            FaceMeshConnections.FACEMESH_RIGHT_IRIS,
+            RIGHT_EYE_COLOR,
+            RIGHT_EYE_THICKNESS);
+        drawLandmarks(
+            result.multiFaceLandmarks().get(i).getLandmarkList(),
+            FaceMeshConnections.FACEMESH_LEFT_IRIS,
+            LEFT_EYE_COLOR,
+            LEFT_EYE_THICKNESS);
+      }
     }
   }
 
   /**
-   * Calls this to delete the shader program.
+   * Deletes the shader program.
    *
    * <p>This is only necessary if one wants to release the program while keeping the context around.
    */
@@ -159,13 +159,9 @@ public class FaceMeshResultGlRenderer implements ResultGlRenderer<FaceMeshResult
     GLES20.glUniform4fv(colorHandle, 1, colorArray, 0);
     GLES20.glLineWidth(thickness);
     for (FaceMeshConnections.Connection c : connections) {
-      float[] vertex = new float[4];
       NormalizedLandmark start = faceLandmarkList.get(c.start());
-      vertex[0] = normalizedLandmarkValue(start.getX());
-      vertex[1] = normalizedLandmarkValue(start.getY());
       NormalizedLandmark end = faceLandmarkList.get(c.end());
-      vertex[2] = normalizedLandmarkValue(end.getX());
-      vertex[3] = normalizedLandmarkValue(end.getY());
+      float[] vertex = {start.getX(), start.getY(), end.getX(), end.getY()};
       FloatBuffer vertexBuffer =
           ByteBuffer.allocateDirect(vertex.length * 4)
               .order(ByteOrder.nativeOrder())
@@ -177,10 +173,4 @@ public class FaceMeshResultGlRenderer implements ResultGlRenderer<FaceMeshResult
       GLES20.glDrawArrays(GLES20.GL_LINES, 0, 2);
     }
   }
-
-  // Normalizes the value from the landmark value range:[0, 1] to the standard OpenGL coordinate
-  // value range: [-1, 1].
-  private float normalizedLandmarkValue(float value) {
-    return value * 2 - 1;
-  }
 }

mediapipe/examples/android/solutions/facemesh/src/main/java/com/google/mediapipe/examples/facemesh/FaceMeshResultImageView.java

@@ -24,11 +24,12 @@ import androidx.appcompat.widget.AppCompatImageView;
 import android.util.Size;
 import com.google.common.collect.ImmutableSet;
 import com.google.mediapipe.formats.proto.LandmarkProto.NormalizedLandmark;
+import com.google.mediapipe.solutions.facemesh.FaceMesh;
 import com.google.mediapipe.solutions.facemesh.FaceMeshConnections;
 import com.google.mediapipe.solutions.facemesh.FaceMeshResult;
 import java.util.List;
 
-/** An ImageView implementation for displaying MediaPipe FaceMesh results. */
+/** An ImageView implementation for displaying {@link FaceMeshResult}. */
 public class FaceMeshResultImageView extends AppCompatImageView {
   private static final String TAG = "FaceMeshResultImageView";
 
@@ -103,7 +104,7 @@ public class FaceMeshResultImageView extends AppCompatImageView {
       drawLandmarksOnCanvas(
           canvas,
           result.multiFaceLandmarks().get(i).getLandmarkList(),
-          FaceMeshConnections.FACEMESH_LEFT_EYEBR0W,
+          FaceMeshConnections.FACEMESH_LEFT_EYEBROW,
           imageSize,
           LEFT_EYEBROW_COLOR,
           LEFT_EYEBROW_THICKNESS);
@@ -121,10 +122,27 @@ public class FaceMeshResultImageView extends AppCompatImageView {
           imageSize,
           LIPS_COLOR,
           LIPS_THICKNESS);
+      if (result.multiFaceLandmarks().get(i).getLandmarkCount()
+          == FaceMesh.FACEMESH_NUM_LANDMARKS_WITH_IRISES) {
+        drawLandmarksOnCanvas(
+            canvas,
+            result.multiFaceLandmarks().get(i).getLandmarkList(),
+            FaceMeshConnections.FACEMESH_RIGHT_IRIS,
+            imageSize,
+            RIGHT_EYE_COLOR,
+            RIGHT_EYE_THICKNESS);
+        drawLandmarksOnCanvas(
+            canvas,
+            result.multiFaceLandmarks().get(i).getLandmarkList(),
+            FaceMeshConnections.FACEMESH_LEFT_IRIS,
+            imageSize,
+            LEFT_EYE_COLOR,
+            LEFT_EYE_THICKNESS);
+      }
     }
   }
 
-  /** Updates the image view with the latest facemesh result. */
+  /** Updates the image view with the latest {@link FaceMeshResult}. */
   public void update() {
     postInvalidate();
     if (latest != null) {
@@ -132,7 +150,6 @@ public class FaceMeshResultImageView extends AppCompatImageView {
     }
   }
 
-  // TODO: Better hand landmark and hand connection drawing.
   private void drawLandmarksOnCanvas(
       Canvas canvas,
       List<NormalizedLandmark> faceLandmarkList,

mediapipe/examples/android/solutions/facemesh/src/main/java/com/google/mediapipe/examples/facemesh/MainActivity.java

@@ -16,6 +16,7 @@ package com.google.mediapipe.examples.facemesh;
 
 import android.content.Intent;
 import android.graphics.Bitmap;
+import android.graphics.Matrix;
 import android.os.Bundle;
 import android.provider.MediaStore;
 import androidx.appcompat.app.AppCompatActivity;
@@ -25,6 +26,8 @@ import android.widget.Button;
 import android.widget.FrameLayout;
 import androidx.activity.result.ActivityResultLauncher;
 import androidx.activity.result.contract.ActivityResultContracts;
+import androidx.exifinterface.media.ExifInterface;
+// ContentResolver dependency
 import com.google.mediapipe.formats.proto.LandmarkProto.NormalizedLandmark;
 import com.google.mediapipe.solutioncore.CameraInput;
 import com.google.mediapipe.solutioncore.SolutionGlSurfaceView;
@@ -33,6 +36,7 @@ import com.google.mediapipe.solutions.facemesh.FaceMesh;
 import com.google.mediapipe.solutions.facemesh.FaceMeshOptions;
 import com.google.mediapipe.solutions.facemesh.FaceMeshResult;
 import java.io.IOException;
+import java.io.InputStream;
 
 /** Main activity of MediaPipe Face Mesh app. */
 public class MainActivity extends AppCompatActivity {
@@ -57,12 +61,14 @@ public class MainActivity extends AppCompatActivity {
   private ActivityResultLauncher<Intent> videoGetter;
   // Live camera demo UI and camera components.
   private CameraInput cameraInput;
+
   private SolutionGlSurfaceView<FaceMeshResult> glSurfaceView;
 
   @Override
   protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_main);
+    // TODO: Add a toggle to switch between the original face mesh and attention mesh.
     setupStaticImageDemoUiComponents();
     setupVideoDemoUiComponents();
     setupLiveDemoUiComponents();
@@ -111,6 +117,35 @@ public class MainActivity extends AppCompatActivity {
                   } catch (IOException e) {
                     Log.e(TAG, "Bitmap reading error:" + e);
                   }
+                  try {
+                    InputStream imageData =
+                        this.getContentResolver().openInputStream(resultIntent.getData());
+                    int orientation =
+                        new ExifInterface(imageData)
+                            .getAttributeInt(
+                                ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
+                    if (orientation != ExifInterface.ORIENTATION_NORMAL) {
+                      Matrix matrix = new Matrix();
+                      switch (orientation) {
+                        case ExifInterface.ORIENTATION_ROTATE_90:
+                          matrix.postRotate(90);
+                          break;
+                        case ExifInterface.ORIENTATION_ROTATE_180:
+                          matrix.postRotate(180);
+                          break;
+                        case ExifInterface.ORIENTATION_ROTATE_270:
+                          matrix.postRotate(270);
+                          break;
+                        default:
+                          matrix.postRotate(0);
+                      }
+                      bitmap =
+                          Bitmap.createBitmap(
+                              bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
+                    }
+                  } catch (IOException e) {
+                    Log.e(TAG, "Bitmap rotation error:" + e);
+                  }
                   if (bitmap != null) {
                     facemesh.send(bitmap);
                   }
@@ -132,19 +167,20 @@ public class MainActivity extends AppCompatActivity {
     imageView = new FaceMeshResultImageView(this);
   }
 
-  /** The core MediaPipe FaceMesh setup workflow for its static image mode. */
+  /** Sets up core workflow for static image mode. */
   private void setupStaticImageModePipeline() {
     this.inputSource = InputSource.IMAGE;
-    // Initializes a new MediaPipe FaceMesh instance in the static image mode.
+    // Initializes a new MediaPipe Face Mesh solution instance in the static image mode.
     facemesh =
         new FaceMesh(
             this,
             FaceMeshOptions.builder()
-                .setMode(FaceMeshOptions.STATIC_IMAGE_MODE)
+                .setStaticImageMode(true)
+                .setRefineLandmarks(true)
                 .setRunOnGpu(RUN_ON_GPU)
                 .build());
 
-    // Connects MediaPipe FaceMesh to the user-defined FaceMeshResultImageView.
+    // Connects MediaPipe Face Mesh solution to the user-defined FaceMeshResultImageView.
     facemesh.setResultListener(
         faceMeshResult -> {
           logNoseLandmark(faceMeshResult, /*showPixelValues=*/ true);
@@ -207,25 +243,24 @@ public class MainActivity extends AppCompatActivity {
         });
   }
 
-  /** The core MediaPipe FaceMesh setup workflow for its streaming mode. */
+  /** Sets up core workflow for streaming mode. */
   private void setupStreamingModePipeline(InputSource inputSource) {
     this.inputSource = inputSource;
-    // Initializes a new MediaPipe FaceMesh instance in the streaming mode.
+    // Initializes a new MediaPipe Face Mesh solution instance in the streaming mode.
     facemesh =
         new FaceMesh(
             this,
             FaceMeshOptions.builder()
-                .setMode(FaceMeshOptions.STREAMING_MODE)
+                .setStaticImageMode(false)
+                .setRefineLandmarks(true)
                 .setRunOnGpu(RUN_ON_GPU)
                 .build());
     facemesh.setErrorListener((message, e) -> Log.e(TAG, "MediaPipe Face Mesh error:" + message));
 
     if (inputSource == InputSource.CAMERA) {
-      // Initializes a new CameraInput instance and connects it to MediaPipe FaceMesh.
       cameraInput = new CameraInput(this);
       cameraInput.setNewFrameListener(textureFrame -> facemesh.send(textureFrame));
     } else if (inputSource == InputSource.VIDEO) {
-      // Initializes a new VideoInput instance and connects it to MediaPipe FaceMesh.
       videoInput = new VideoInput(this);
       videoInput.setNewFrameListener(textureFrame -> facemesh.send(textureFrame));
     }

mediapipe/examples/android/solutions/hands/build.gradle

@@ -31,15 +31,16 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.3.0'
     implementation 'com.google.android.material:material:1.3.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
+    implementation 'androidx.exifinterface:exifinterface:1.3.3'
     testImplementation 'junit:junit:4.+'
     androidTestImplementation 'androidx.test.ext:junit:1.1.2'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
-    // MediaPipe hands solution API and solution-core.
+    // MediaPipe Hands Solution components.
     implementation 'com.google.mediapipe:solution-core:latest.release'
     implementation 'com.google.mediapipe:hands:latest.release'
     // MediaPipe deps
-    implementation 'com.google.flogger:flogger:latest.release'
-    implementation 'com.google.flogger:flogger-system-backend:latest.release'
+    implementation 'com.google.flogger:flogger:0.6'
+    implementation 'com.google.flogger:flogger-system-backend:0.6'
     implementation 'com.google.guava:guava:27.0.1-android'
     implementation 'com.google.protobuf:protobuf-java:3.11.4'
     // CameraX core library

mediapipe/examples/android/solutions/hands/src/main/BUILD

@@ -38,6 +38,7 @@ android_binary(
         "//third_party:opencv",
         "@maven//:androidx_activity_activity",
         "@maven//:androidx_concurrent_concurrent_futures",
+        "@maven//:androidx_exifinterface_exifinterface",
         "@maven//:androidx_fragment_fragment",
         "@maven//:com_google_guava_guava",
     ],

mediapipe/examples/android/solutions/hands/src/main/java/com/google/mediapipe/examples/hands/HandsResultGlRenderer.java

@@ -15,9 +15,7 @@
 package com.google.mediapipe.examples.hands;
 
 import android.opengl.GLES20;
-import android.opengl.Matrix;
 import com.google.mediapipe.formats.proto.LandmarkProto.NormalizedLandmark;
-import com.google.mediapipe.solutioncore.ResultGlBoundary;
 import com.google.mediapipe.solutioncore.ResultGlRenderer;
 import com.google.mediapipe.solutions.hands.Hands;
 import com.google.mediapipe.solutions.hands.HandsResult;
@@ -26,16 +24,16 @@ import java.nio.ByteOrder;
 import java.nio.FloatBuffer;
 import java.util.List;
 
-/** A custom implementation of {@link ResultGlRenderer} to render MediaPope Hands results. */
+/** A custom implementation of {@link ResultGlRenderer} to render {@link HandsResult}. */
 public class HandsResultGlRenderer implements ResultGlRenderer<HandsResult> {
   private static final String TAG = "HandsResultGlRenderer";
 
   private static final float CONNECTION_THICKNESS = 20.0f;
   private static final String VERTEX_SHADER =
-      "uniform mat4 uTransformMatrix;\n"
+      "uniform mat4 uProjectionMatrix;\n"
           + "attribute vec4 vPosition;\n"
           + "void main() {\n"
-          + "  gl_Position = uTransformMatrix * vPosition;\n"
+          + "  gl_Position = uProjectionMatrix * vPosition;\n"
           + "}";
   private static final String FRAGMENT_SHADER =
       "precision mediump float;\n"
@@ -44,8 +42,7 @@ public class HandsResultGlRenderer implements ResultGlRenderer<HandsResult> {
           + "}";
   private int program;
   private int positionHandle;
-  private int transformMatrixHandle;
-  private final float[] transformMatrix = new float[16];
+  private int projectionMatrixHandle;
 
   private int loadShader(int type, String shaderCode) {
     int shader = GLES20.glCreateShader(type);
@@ -63,27 +60,16 @@ public class HandsResultGlRenderer implements ResultGlRenderer<HandsResult> {
     GLES20.glAttachShader(program, fragmentShader);
     GLES20.glLinkProgram(program);
     positionHandle = GLES20.glGetAttribLocation(program, "vPosition");
-    transformMatrixHandle = GLES20.glGetUniformLocation(program, "uTransformMatrix");
+    projectionMatrixHandle = GLES20.glGetUniformLocation(program, "uProjectionMatrix");
   }
 
   @Override
-  public void renderResult(HandsResult result, ResultGlBoundary boundary) {
+  public void renderResult(HandsResult result, float[] projectionMatrix) {
     if (result == null) {
       return;
     }
     GLES20.glUseProgram(program);
-    // Sets the transform matrix to align the result rendering with the scaled output texture.
-    // Also flips the rendering vertically since OpenGL assumes the coordinate origin is at the
-    // bottom-left corner, whereas MediaPipe landmark data assumes the coordinate origin is at the
-    // top-left corner.
-    Matrix.setIdentityM(transformMatrix, 0);
-    Matrix.scaleM(
-        transformMatrix,
-        0,
-        2 / (boundary.right() - boundary.left()),
-        -2 / (boundary.top() - boundary.bottom()),
-        1.0f);
-    GLES20.glUniformMatrix4fv(transformMatrixHandle, 1, false, transformMatrix, 0);
+    GLES20.glUniformMatrix4fv(projectionMatrixHandle, 1, false, projectionMatrix, 0);
     GLES20.glLineWidth(CONNECTION_THICKNESS);
 
     int numHands = result.multiHandLandmarks().size();
@@ -93,7 +79,7 @@ public class HandsResultGlRenderer implements ResultGlRenderer<HandsResult> {
   }
 
   /**
-   * Calls this to delete the shader program.
+   * Deletes the shader program.
    *
    * <p>This is only necessary if one wants to release the program while keeping the context around.
    */
@@ -101,16 +87,11 @@ public class HandsResultGlRenderer implements ResultGlRenderer<HandsResult> {
     GLES20.glDeleteProgram(program);
   }
 
-  // TODO: Better hand landmark and hand connection drawing.
   private void drawLandmarks(List<NormalizedLandmark> handLandmarkList) {
     for (Hands.Connection c : Hands.HAND_CONNECTIONS) {
-      float[] vertex = new float[4];
       NormalizedLandmark start = handLandmarkList.get(c.start());
-      vertex[0] = normalizedLandmarkValue(start.getX());
-      vertex[1] = normalizedLandmarkValue(start.getY());
       NormalizedLandmark end = handLandmarkList.get(c.end());
-      vertex[2] = normalizedLandmarkValue(end.getX());
-      vertex[3] = normalizedLandmarkValue(end.getY());
+      float[] vertex = {start.getX(), start.getY(), end.getX(), end.getY()};
       FloatBuffer vertexBuffer =
           ByteBuffer.allocateDirect(vertex.length * 4)
               .order(ByteOrder.nativeOrder())
@@ -122,10 +103,4 @@ public class HandsResultGlRenderer implements ResultGlRenderer<HandsResult> {
       GLES20.glDrawArrays(GLES20.GL_LINES, 0, 2);
     }
   }
-
-  // Normalizes the value from the landmark value range:[0, 1] to the standard OpenGL coordinate
-  // value range: [-1, 1].
-  private float normalizedLandmarkValue(float value) {
-    return value * 2 - 1;
-  }
 }

mediapipe/examples/android/solutions/hands/src/main/java/com/google/mediapipe/examples/hands/HandsResultImageView.java

@@ -27,7 +27,7 @@ import com.google.mediapipe.solutions.hands.Hands;
 import com.google.mediapipe.solutions.hands.HandsResult;
 import java.util.List;
 
-/** An ImageView implementation for displaying MediaPipe Hands results. */
+/** An ImageView implementation for displaying {@link HandsResult}. */
 public class HandsResultImageView extends AppCompatImageView {
   private static final String TAG = "HandsResultImageView";
 
@@ -66,7 +66,7 @@ public class HandsResultImageView extends AppCompatImageView {
     }
   }
 
-  /** Updates the image view with the latest hands result. */
+  /** Updates the image view with the latest {@link HandsResult}. */
   public void update() {
     postInvalidate();
     if (latest != null) {
@@ -74,7 +74,6 @@ public class HandsResultImageView extends AppCompatImageView {
     }
   }
 
-  // TODO: Better hand landmark and hand connection drawing.
   private void drawLandmarksOnCanvas(
       List<NormalizedLandmark> handLandmarkList, Canvas canvas, int width, int height) {
     // Draw connections.

mediapipe/examples/android/solutions/hands/src/main/java/com/google/mediapipe/examples/hands/MainActivity.java

@@ -16,6 +16,7 @@ package com.google.mediapipe.examples.hands;
 
 import android.content.Intent;
 import android.graphics.Bitmap;
+import android.graphics.Matrix;
 import android.os.Bundle;
 import android.provider.MediaStore;
 import androidx.appcompat.app.AppCompatActivity;
@@ -25,6 +26,8 @@ import android.widget.Button;
 import android.widget.FrameLayout;
 import androidx.activity.result.ActivityResultLauncher;
 import androidx.activity.result.contract.ActivityResultContracts;
+import androidx.exifinterface.media.ExifInterface;
+// ContentResolver dependency
 import com.google.mediapipe.formats.proto.LandmarkProto.NormalizedLandmark;
 import com.google.mediapipe.solutioncore.CameraInput;
 import com.google.mediapipe.solutioncore.SolutionGlSurfaceView;
@@ -34,6 +37,7 @@ import com.google.mediapipe.solutions.hands.Hands;
 import com.google.mediapipe.solutions.hands.HandsOptions;
 import com.google.mediapipe.solutions.hands.HandsResult;
 import java.io.IOException;
+import java.io.InputStream;
 
 /** Main activity of MediaPipe Hands app. */
 public class MainActivity extends AppCompatActivity {
@@ -59,6 +63,7 @@ public class MainActivity extends AppCompatActivity {
   private ActivityResultLauncher<Intent> videoGetter;
   // Live camera demo UI and camera components.
   private CameraInput cameraInput;
+
   private SolutionGlSurfaceView<HandsResult> glSurfaceView;
 
   @Override
@@ -113,6 +118,35 @@ public class MainActivity extends AppCompatActivity {
                   } catch (IOException e) {
                     Log.e(TAG, "Bitmap reading error:" + e);
                   }
+                  try {
+                    InputStream imageData =
+                        this.getContentResolver().openInputStream(resultIntent.getData());
+                    int orientation =
+                        new ExifInterface(imageData)
+                            .getAttributeInt(
+                                ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
+                    if (orientation != ExifInterface.ORIENTATION_NORMAL) {
+                      Matrix matrix = new Matrix();
+                      switch (orientation) {
+                        case ExifInterface.ORIENTATION_ROTATE_90:
+                          matrix.postRotate(90);
+                          break;
+                        case ExifInterface.ORIENTATION_ROTATE_180:
+                          matrix.postRotate(180);
+                          break;
+                        case ExifInterface.ORIENTATION_ROTATE_270:
+                          matrix.postRotate(270);
+                          break;
+                        default:
+                          matrix.postRotate(0);
+                      }
+                      bitmap =
+                          Bitmap.createBitmap(
+                              bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
+                    }
+                  } catch (IOException e) {
+                    Log.e(TAG, "Bitmap rotation error:" + e);
+                  }
                   if (bitmap != null) {
                     hands.send(bitmap);
                   }
@@ -134,20 +168,20 @@ public class MainActivity extends AppCompatActivity {
     imageView = new HandsResultImageView(this);
   }
 
-  /** The core MediaPipe Hands setup workflow for its static image mode. */
+  /** Sets up core workflow for static image mode. */
   private void setupStaticImageModePipeline() {
     this.inputSource = InputSource.IMAGE;
-    // Initializes a new MediaPipe Hands instance in the static image mode.
+    // Initializes a new MediaPipe Hands solution instance in the static image mode.
     hands =
         new Hands(
             this,
             HandsOptions.builder()
-                .setMode(HandsOptions.STATIC_IMAGE_MODE)
+                .setStaticImageMode(true)
                 .setMaxNumHands(1)
                 .setRunOnGpu(RUN_ON_GPU)
                 .build());
 
-    // Connects MediaPipe Hands to the user-defined HandsResultImageView.
+    // Connects MediaPipe Hands solution to the user-defined HandsResultImageView.
     hands.setResultListener(
         handsResult -> {
           logWristLandmark(handsResult, /*showPixelValues=*/ true);
@@ -210,26 +244,24 @@ public class MainActivity extends AppCompatActivity {
         });
   }
 
-  /** The core MediaPipe Hands setup workflow for its streaming mode. */
+  /** Sets up core workflow for streaming mode. */
   private void setupStreamingModePipeline(InputSource inputSource) {
     this.inputSource = inputSource;
-    // Initializes a new MediaPipe Hands instance in the streaming mode.
+    // Initializes a new MediaPipe Hands solution instance in the streaming mode.
     hands =
         new Hands(
             this,
             HandsOptions.builder()
-                .setMode(HandsOptions.STREAMING_MODE)
+                .setStaticImageMode(false)
                 .setMaxNumHands(1)
                 .setRunOnGpu(RUN_ON_GPU)
                 .build());
     hands.setErrorListener((message, e) -> Log.e(TAG, "MediaPipe Hands error:" + message));
 
     if (inputSource == InputSource.CAMERA) {
-      // Initializes a new CameraInput instance and connects it to MediaPipe Hands.
       cameraInput = new CameraInput(this);
       cameraInput.setNewFrameListener(textureFrame -> hands.send(textureFrame));
     } else if (inputSource == InputSource.VIDEO) {
-      // Initializes a new VideoInput instance and connects it to MediaPipe Hands.
       videoInput = new VideoInput(this);
       videoInput.setNewFrameListener(textureFrame -> hands.send(textureFrame));
     }

mediapipe/examples/android/solutions/settings.gradle

@@ -1,3 +1,4 @@
 rootProject.name = "mediapipe-solutions-examples"
-include ':hands'
+include ':facedetection'
 include ':facemesh'
+include ':hands'

mediapipe/examples/android/src/java/com/google/mediapipe/apps/facemeshgpu/BUILD

@@ -37,7 +37,7 @@ android_binary(
     srcs = glob(["*.java"]),
     assets = [
         "//mediapipe/graphs/face_mesh:face_mesh_mobile_gpu.binarypb",
-        "//mediapipe/modules/face_landmark:face_landmark.tflite",
+        "//mediapipe/modules/face_landmark:face_landmark_with_attention.tflite",
         "//mediapipe/modules/face_detection:face_detection_short_range.tflite",
     ],
     assets_dir = "",

mediapipe/examples/ios/facemeshgpu/BUILD

@@ -63,7 +63,7 @@ objc_library(
     data = [
         "//mediapipe/graphs/face_mesh:face_mesh_mobile_gpu.binarypb",
         "//mediapipe/modules/face_detection:face_detection_short_range.tflite",
-        "//mediapipe/modules/face_landmark:face_landmark.tflite",
+        "//mediapipe/modules/face_landmark:face_landmark_with_attention.tflite",
     ],
     deps = [
         "//mediapipe/examples/ios/common:CommonMediaPipeAppLibrary",

mediapipe/framework/formats/image_multi_pool.cc

@@ -23,6 +23,7 @@
 #if !MEDIAPIPE_DISABLE_GPU
 #ifdef __APPLE__
 #include "mediapipe/objc/CFHolder.h"
+#include "mediapipe/objc/util.h"
 #endif  // __APPLE__
 #endif  // !MEDIAPIPE_DISABLE_GPU
 

mediapipe/framework/port/BUILD

@@ -89,6 +89,18 @@ cc_library(
     ],
 )
 
+cc_library(
+    name = "commandlineflags",
+    hdrs = [
+        "commandlineflags.h",
+    ],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//third_party:glog",
+        "@com_google_absl//absl/flags:flag",
+    ],
+)
+
 cc_library(
     name = "core_proto",
     hdrs = [

mediapipe/framework/port/commandlineflags.h

@@ -0,0 +1,30 @@
+// Copyright 2019 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef MEDIAPIPE_PORT_COMMANDLINEFLAGS_H_
+#define MEDIAPIPE_PORT_COMMANDLINEFLAGS_H_
+
+#include "gflags/gflags.h"
+namespace absl {
+template <typename T>
+T GetFlag(const T& f) {
+  return f;
+}
+template <typename T, typename U>
+void SetFlag(T* f, const U& u) {
+  *f = u;
+}
+}  // namespace absl
+
+#endif  // MEDIAPIPE_PORT_COMMANDLINEFLAGS_H_

mediapipe/framework/tool/BUILD

@@ -202,6 +202,7 @@ cc_library(
         "//mediapipe/framework:packet_type",
         "//mediapipe/framework/port:advanced_proto",
         "//mediapipe/framework/port:any_proto",
+        "//mediapipe/framework/port:ret_check",
         "//mediapipe/framework/port:status",
         "@com_google_absl//absl/status",
         "@com_google_absl//absl/strings",
@@ -291,7 +292,9 @@ mediapipe_cc_test(
     data = [":node_chain_subgraph.proto"],
     requires_full_emulation = False,
     deps = [
+        ":options_field_util",
         ":options_registry",
+        ":options_syntax_util",
         ":options_util",
         "//mediapipe/calculators/core:flow_limiter_calculator",
         "//mediapipe/calculators/core:flow_limiter_calculator_cc_proto",
@@ -305,8 +308,8 @@ mediapipe_cc_test(
         "//mediapipe/framework/port:status",
         "//mediapipe/framework/testdata:night_light_calculator_options_lib",
         "//mediapipe/framework/tool:node_chain_subgraph_options_lib",
-        "//mediapipe/framework/tool:options_syntax_util",
         "//mediapipe/util:header_util",
+        "@com_google_absl//absl/strings",
     ],
 )
 

mediapipe/framework/tool/options_field_util.cc

@@ -8,11 +8,13 @@
 
 #include "absl/status/status.h"
 #include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
 #include "mediapipe/framework/packet.h"
 #include "mediapipe/framework/packet_type.h"
 #include "mediapipe/framework/port/advanced_proto_inc.h"
 #include "mediapipe/framework/port/any_proto.h"
 #include "mediapipe/framework/port/canonical_errors.h"
+#include "mediapipe/framework/port/ret_check.h"
 #include "mediapipe/framework/port/status.h"
 #include "mediapipe/framework/tool/name_util.h"
 #include "mediapipe/framework/tool/proto_util_lite.h"
@@ -31,6 +33,9 @@ using ::mediapipe::proto_ns::io::StringOutputStream;
 // Utility functions for OptionsFieldUtil.
 namespace {
 
+// The type name for the proto3 "Any" type.
+constexpr absl::string_view kGoogleProtobufAny = "google.protobuf.Any";
+
 // Converts a FieldDescriptor::Type to the corresponding FieldType.
 FieldType AsFieldType(proto_ns::FieldDescriptorProto::Type type) {
   return static_cast<FieldType>(type);
@@ -81,7 +86,7 @@ absl::Status WriteValue(const FieldData& value, FieldType field_type,
       return absl::UnimplementedError(
           absl::StrCat("Cannot write type: ", field_type));
   }
-  return mediapipe::OkStatus();
+  return absl::OkStatus();
 }
 
 // Serializes a packet value.
@@ -167,6 +172,7 @@ absl::Status ReadValue(absl::string_view field_bytes, FieldType field_type,
 // Deserializes a packet from a protobuf field.
 absl::Status ReadField(absl::string_view bytes, const FieldDescriptor* field,
                        FieldData* result) {
+  RET_CHECK_NE(field, nullptr);
   FieldType field_type = AsFieldType(field->type());
   std::string message_type = (field_type == WireFormatLite::TYPE_MESSAGE)
                                  ? field->message_type()->full_name()
@@ -174,47 +180,137 @@ absl::Status ReadField(absl::string_view bytes, const FieldDescriptor* field,
   return ReadValue(bytes, field_type, message_type, result);
 }
 
-// Converts a chain of fields and indexes into field-numbers and indexes.
-ProtoUtilLite::ProtoPath AsProtoPath(const FieldPath& field_path) {
-  ProtoUtilLite::ProtoPath result;
-  for (auto field : field_path) {
-    result.push_back({field.first->number(), field.second});
+// Reads all values from a repeated field.
+absl::Status GetFieldValues(const FieldData& message_data,
+                            const FieldDescriptor& field,
+                            std::vector<FieldData>* result) {
+  const std::string& message_bytes = message_data.message_value().value();
+  FieldType field_type = AsFieldType(field.type());
+  ProtoUtilLite proto_util;
+  ProtoUtilLite::ProtoPath proto_path = {{field.number(), 0}};
+  int count;
+  MP_RETURN_IF_ERROR(
+      proto_util.GetFieldCount(message_bytes, proto_path, field_type, &count));
+  std::vector<std::string> field_values;
+  MP_RETURN_IF_ERROR(proto_util.GetFieldRange(message_bytes, proto_path, count,
+                                              field_type, &field_values));
+  for (int i = 0; i < count; ++i) {
+    FieldData r;
+    MP_RETURN_IF_ERROR(ReadField(field_values[i], &field, &r));
+    result->push_back(std::move(r));
   }
+  return absl::OkStatus();
+}
+
+// Reads one value from a field.
+absl::Status GetFieldValue(const FieldData& message_data,
+                           const FieldPathEntry& entry, FieldData* result) {
+  RET_CHECK_NE(entry.field, nullptr);
+  const std::string& message_bytes = message_data.message_value().value();
+  FieldType field_type = AsFieldType(entry.field->type());
+  ProtoUtilLite proto_util;
+  ProtoUtilLite::ProtoPath proto_path = {{entry.field->number(), entry.index}};
+  std::vector<std::string> field_values;
+  MP_RETURN_IF_ERROR(proto_util.GetFieldRange(message_bytes, proto_path, 1,
+                                              field_type, &field_values));
+  MP_RETURN_IF_ERROR(ReadField(field_values[0], entry.field, result));
+  return absl::OkStatus();
+}
+
+// Writes one value to a field.
+absl::Status SetFieldValue(const FieldPathEntry& entry, const FieldData& value,
+                           FieldData* result) {
+  std::vector<FieldData> field_values;
+  ProtoUtilLite proto_util;
+  FieldType field_type = AsFieldType(entry.field->type());
+  ProtoUtilLite::ProtoPath proto_path = {{entry.field->number(), entry.index}};
+  std::string* message_bytes = result->mutable_message_value()->mutable_value();
+  int field_count;
+  MP_RETURN_IF_ERROR(proto_util.GetFieldCount(*message_bytes, proto_path,
+                                              field_type, &field_count));
+  if (entry.index > field_count) {
+    return absl::OutOfRangeError(
+        absl::StrCat("Option field index out of range: ", entry.index));
+  }
+  int replace_length = entry.index < field_count ? 1 : 0;
+  std::string field_value;
+  MP_RETURN_IF_ERROR(WriteField(value, entry.field, &field_value));
+  MP_RETURN_IF_ERROR(proto_util.ReplaceFieldRange(
+      message_bytes, proto_path, replace_length, field_type, {field_value}));
+  return absl::OkStatus();
+}
+
+// Returns true for a field of type "google.protobuf.Any".
+bool IsProtobufAny(const FieldDescriptor* field) {
+  return AsFieldType(field->type()) == FieldType::TYPE_MESSAGE &&
+         field->message_type()->full_name() == kGoogleProtobufAny;
+}
+
+// Returns the message FieldData from a serialized protobuf.Any.
+FieldData ParseProtobufAny(const FieldData& data) {
+  protobuf::Any any;
+  any.ParseFromString(data.message_value().value());
+  FieldData result;
+  result.mutable_message_value()->set_value(std::string(any.value()));
+  result.mutable_message_value()->set_type_url(any.type_url());
   return result;
 }
 
-// Returns the options protobuf for a subgraph.
-// TODO: Ensure that this works with multiple options protobufs.
-absl::Status GetOptionsMessage(
-    const proto_ns::RepeatedPtrField<mediapipe::protobuf::Any>& options_any,
-    const proto_ns::MessageLite& options_ext, FieldData* result) {
-  // Read the "graph_options" or "node_options" field.
-  for (const auto& options : options_any) {
-    if (options.type_url().empty()) {
-      continue;
-    }
-    result->mutable_message_value()->set_type_url(options.type_url());
-    result->mutable_message_value()->set_value(std::string(options.value()));
-    return mediapipe::OkStatus();
+// Returns the serialized protobuf.Any containing a message FieldData.
+FieldData SerializeProtobufAny(const FieldData& data) {
+  protobuf::Any any;
+  any.set_value(data.message_value().value());
+  any.set_type_url(data.message_value().type_url());
+  FieldData result;
+  result.mutable_message_value()->set_value(any.SerializeAsString());
+  result.mutable_message_value()->set_type_url(TypeUrl(kGoogleProtobufAny));
+  return result;
 }
 
-  // Read the "options" field.
-  FieldData message_data;
-  *message_data.mutable_message_value()->mutable_value() =
-      options_ext.SerializeAsString();
-  message_data.mutable_message_value()->set_type_url(options_ext.GetTypeName());
-  std::vector<const FieldDescriptor*> ext_fields;
-  OptionsRegistry::FindAllExtensions(options_ext.GetTypeName(), &ext_fields);
-  for (auto ext_field : ext_fields) {
-    absl::Status status = GetField({{ext_field, 0}}, message_data, result);
-    if (!status.ok()) {
-      return status;
+// Returns the field index of an extension type in a repeated field.
+StatusOr<int> FindExtensionIndex(const FieldData& message_data,
+                                 FieldPathEntry* entry) {
+  if (entry->field == nullptr || !IsProtobufAny(entry->field)) {
+    return -1;
   }
-    if (result->has_message_value()) {
-      return status;
+  std::string& extension_type = entry->extension_type;
+  std::vector<FieldData> field_values;
+  RET_CHECK_NE(entry->field, nullptr);
+  MP_RETURN_IF_ERROR(
+      GetFieldValues(message_data, *entry->field, &field_values));
+  for (int i = 0; i < field_values.size(); ++i) {
+    FieldData extension = ParseProtobufAny(field_values[i]);
+    if (extension_type == "*" ||
+        ParseTypeUrl(extension.message_value().type_url()) == extension_type) {
+      return i;
     }
   }
-  return mediapipe::OkStatus();
+  return -1;
+}
+
+// Returns true if the value of a field is available.
+bool HasField(const FieldPath& field_path, const FieldData& message_data) {
+  FieldData value;
+  return GetField(field_path, message_data, &value).ok() &&
+         value.value_case() != mediapipe::FieldData::VALUE_NOT_SET;
+}
+
+// Returns the extension field containing the specified extension-type.
+const FieldDescriptor* FindExtensionField(const FieldData& message_data,
+                                          absl::string_view extension_type) {
+  std::string message_type =
+      ParseTypeUrl(message_data.message_value().type_url());
+  std::vector<const FieldDescriptor*> extensions;
+  OptionsRegistry::FindAllExtensions(message_type, &extensions);
+  for (const FieldDescriptor* extension : extensions) {
+    if (extension->message_type()->full_name() == extension_type) {
+      return extension;
+    }
+    if (extension_type == "*" && HasField({{extension, 0}}, message_data)) {
+      return extension;
+    }
+  }
+  return nullptr;
 }
 
 // Sets a protobuf in a repeated protobuf::Any field.
@@ -234,6 +330,20 @@ void SetOptionsMessage(
   *options_any->mutable_value() = node_options.message_value().value();
 }
 
+// Returns the count of values in a repeated field.
+int FieldCount(const FieldData& message_data, const FieldDescriptor* field) {
+  const std::string& message_bytes = message_data.message_value().value();
+  FieldType field_type = AsFieldType(field->type());
+  ProtoUtilLite proto_util;
+  ProtoUtilLite::ProtoPath proto_path = {{field->number(), 0}};
+  int count;
+  if (proto_util.GetFieldCount(message_bytes, proto_path, field_type, &count)
+          .ok()) {
+    return count;
+  }
+  return 0;
+}
+
 }  // anonymous namespace
 
 // Deserializes a packet containing a MessageLite value.
@@ -247,7 +357,7 @@ absl::Status ReadMessage(const std::string& value, const std::string& type_name,
 }
 
 // Merge two options FieldData values.
-absl::Status MergeOptionsMessages(const FieldData& base, const FieldData& over,
+absl::Status MergeMessages(const FieldData& base, const FieldData& over,
                            FieldData* result) {
   absl::Status status;
   if (over.value_case() == FieldData::VALUE_NOT_SET) {
@@ -278,28 +388,148 @@ absl::Status MergeOptionsMessages(const FieldData& base, const FieldData& over,
   return status;
 }
 
+// Returns either the extension field or the repeated protobuf.Any field index
+// holding the specified extension-type.
+absl::Status FindExtension(const FieldData& message_data,
+                           FieldPathEntry* entry) {
+  if (entry->extension_type.empty()) {
+    return absl::OkStatus();
+  }
+
+  // For repeated protobuf::Any, find the index for the extension_type.
+  ASSIGN_OR_RETURN(int index, FindExtensionIndex(message_data, entry));
+  if (index != -1) {
+    entry->index = index;
+    return absl::OkStatus();
+  }
+
+  // Returns the extension field containing the specified extension-type.
+  std::string& extension_type = entry->extension_type;
+  const FieldDescriptor* field =
+      FindExtensionField(message_data, extension_type);
+  if (field != nullptr) {
+    entry->field = field;
+    entry->index = 0;
+    return absl::OkStatus();
+  }
+  return absl::NotFoundError(
+      absl::StrCat("Option extension not found: ", extension_type));
+}
+
+// Return the FieldPath referencing an extension message.
+FieldPath GetExtensionPath(const std::string& parent_type,
+                           const std::string& extension_type,
+                           const std::string& field_name,
+                           bool is_protobuf_any) {
+  FieldPath result;
+  const tool::Descriptor* parent_descriptor =
+      tool::OptionsRegistry::GetProtobufDescriptor(parent_type);
+  FieldPathEntry field_entry;
+  field_entry.field = parent_descriptor->FindFieldByName(field_name);
+  if (is_protobuf_any) {
+    field_entry.extension_type = extension_type;
+    result = {std::move(field_entry)};
+  } else {
+    field_entry.index = 0;
+    FieldPathEntry extension_entry;
+    extension_entry.extension_type = extension_type;
+    result = {std::move(field_entry), std::move(extension_entry)};
+  }
+  return result;
+}
+
+// Returns the requested options protobuf for a graph node.
+absl::Status GetNodeOptions(const FieldData& message_data,
+                            const std::string& extension_type,
+                            FieldData* result) {
+  constexpr char kOptionsName[] = "options";
+  constexpr char kNodeOptionsName[] = "node_options";
+  std::string parent_type = options_field_util::ParseTypeUrl(
+      std::string(message_data.message_value().type_url()));
+  FieldPath path;
+  Status status;
+  path = GetExtensionPath(parent_type, extension_type, kOptionsName, false);
+  status = GetField(path, message_data, result);
+  if (status.ok()) {
+    return status;
+  }
+  path = GetExtensionPath(parent_type, extension_type, kNodeOptionsName, true);
+  status = GetField(path, message_data, result);
+  return status;
+}
+
+// Returns the requested options protobuf for a graph.
+absl::Status GetGraphOptions(const FieldData& message_data,
+                             const std::string& extension_type,
+                             FieldData* result) {
+  constexpr char kOptionsName[] = "options";
+  constexpr char kGraphOptionsName[] = "graph_options";
+  std::string parent_type = options_field_util::ParseTypeUrl(
+      std::string(message_data.message_value().type_url()));
+  FieldPath path;
+  Status status;
+  path = GetExtensionPath(parent_type, extension_type, kOptionsName, false);
+  status = GetField(path, message_data, result);
+  if (status.ok()) {
+    return status;
+  }
+  path = GetExtensionPath(parent_type, extension_type, kGraphOptionsName, true);
+  status = GetField(path, message_data, result);
+  return status;
+}
+
+// Reads a FieldData value from a protobuf field.
+absl::Status GetField(const FieldPath& field_path,
+                      const FieldData& message_data, FieldData* result) {
+  if (field_path.empty()) {
+    *result->mutable_message_value() = message_data.message_value();
+    return absl::OkStatus();
+  }
+  FieldPathEntry head = field_path.front();
+  FieldPath tail = field_path;
+  tail.erase(tail.begin());
+  if (!head.extension_type.empty()) {
+    MP_RETURN_IF_ERROR(FindExtension(message_data, &head));
+  }
+  if (tail.empty() && FieldCount(message_data, head.field) == 0) {
+    return absl::OkStatus();
+  }
+  MP_RETURN_IF_ERROR(GetFieldValue(message_data, head, result));
+  if (IsProtobufAny(head.field)) {
+    *result = ParseProtobufAny(*result);
+  }
+  if (!tail.empty()) {
+    FieldData child = *result;
+    MP_RETURN_IF_ERROR(GetField(tail, child, result));
+  }
+  return absl::OkStatus();
+}
+
 // Writes a FieldData value into protobuf field.
 absl::Status SetField(const FieldPath& field_path, const FieldData& value,
                       FieldData* message_data) {
   if (field_path.empty()) {
     *message_data->mutable_message_value() = value.message_value();
-    return mediapipe::OkStatus();
+    return absl::OkStatus();
   }
-  ProtoUtilLite proto_util;
-  const FieldDescriptor* field = field_path.back().first;
-  FieldType field_type = AsFieldType(field->type());
-  std::string field_value;
-  MP_RETURN_IF_ERROR(WriteField(value, field, &field_value));
-  ProtoUtilLite::ProtoPath proto_path = AsProtoPath(field_path);
-  std::string* message_bytes =
-      message_data->mutable_message_value()->mutable_value();
-  int field_count;
-  MP_RETURN_IF_ERROR(proto_util.GetFieldCount(*message_bytes, proto_path,
-                                              field_type, &field_count));
-  MP_RETURN_IF_ERROR(
-      proto_util.ReplaceFieldRange(message_bytes, AsProtoPath(field_path),
-                                   field_count, field_type, {field_value}));
-  return mediapipe::OkStatus();
+  FieldPathEntry head = field_path.front();
+  FieldPath tail = field_path;
+  tail.erase(tail.begin());
+  if (!head.extension_type.empty()) {
+    MP_RETURN_IF_ERROR(FindExtension(*message_data, &head));
+  }
+  if (tail.empty()) {
+    MP_RETURN_IF_ERROR(SetFieldValue(head, value, message_data));
+  } else {
+    FieldData child;
+    MP_RETURN_IF_ERROR(GetFieldValue(*message_data, head, &child));
+    MP_RETURN_IF_ERROR(SetField(tail, value, &child));
+    if (IsProtobufAny(head.field)) {
+      child = SerializeProtobufAny(child);
+    }
+    MP_RETURN_IF_ERROR(SetFieldValue(head, child, message_data));
+  }
+  return absl::OkStatus();
 }
 
 // Merges a packet value into nested protobuf Message.
@@ -308,7 +538,7 @@ absl::Status MergeField(const FieldPath& field_path, const FieldData& value,
   absl::Status status;
   FieldType field_type = field_path.empty()
                              ? FieldType::TYPE_MESSAGE
-                             : AsFieldType(field_path.back().first->type());
+                             : AsFieldType(field_path.back().field->type());
   std::string message_type =
       (value.has_message_value())
           ? ParseTypeUrl(std::string(value.message_value().type_url()))
@@ -317,49 +547,12 @@ absl::Status MergeField(const FieldPath& field_path, const FieldData& value,
   if (field_type == FieldType::TYPE_MESSAGE) {
     FieldData b;
     status.Update(GetField(field_path, *message_data, &b));
-    status.Update(MergeOptionsMessages(b, v, &v));
+    status.Update(MergeMessages(b, v, &v));
   }
   status.Update(SetField(field_path, v, message_data));
   return status;
 }
 
-// Reads a packet value from a protobuf field.
-absl::Status GetField(const FieldPath& field_path,
-                      const FieldData& message_data, FieldData* result) {
-  if (field_path.empty()) {
-    *result->mutable_message_value() = message_data.message_value();
-    return mediapipe::OkStatus();
-  }
-  ProtoUtilLite proto_util;
-  const FieldDescriptor* field = field_path.back().first;
-  FieldType field_type = AsFieldType(field->type());
-  std::vector<std::string> field_values;
-  ProtoUtilLite::ProtoPath proto_path = AsProtoPath(field_path);
-  const std::string& message_bytes = message_data.message_value().value();
-  int field_count;
-  MP_RETURN_IF_ERROR(proto_util.GetFieldCount(message_bytes, proto_path,
-                                              field_type, &field_count));
-  if (field_count == 0) {
-    return mediapipe::OkStatus();
-  }
-  MP_RETURN_IF_ERROR(proto_util.GetFieldRange(message_bytes, proto_path, 1,
-                                              field_type, &field_values));
-  MP_RETURN_IF_ERROR(ReadField(field_values.front(), field, result));
-  return mediapipe::OkStatus();
-}
-
-// Returns the options protobuf for a graph.
-absl::Status GetOptionsMessage(const CalculatorGraphConfig& config,
-                               FieldData* result) {
-  return GetOptionsMessage(config.graph_options(), config.options(), result);
-}
-
-// Returns the options protobuf for a node.
-absl::Status GetOptionsMessage(const CalculatorGraphConfig::Node& node,
-                               FieldData* result) {
-  return GetOptionsMessage(node.node_options(), node.options(), result);
-}
-
 // Sets the node_options field in a Node, and clears the options field.
 void SetOptionsMessage(const FieldData& node_options,
                        CalculatorGraphConfig::Node* node) {
@@ -367,6 +560,16 @@ void SetOptionsMessage(const FieldData& node_options,
   node->clear_options();
 }
 
+// Serialize a MessageLite to a FieldData.
+FieldData AsFieldData(const proto_ns::MessageLite& message) {
+  FieldData result;
+  *result.mutable_message_value()->mutable_value() =
+      message.SerializePartialAsString();
+  *result.mutable_message_value()->mutable_type_url() =
+      TypeUrl(message.GetTypeName());
+  return result;
+}
+
 // Represents a protobuf enum value stored in a Packet.
 struct ProtoEnum {
   ProtoEnum(int32 v) : value(v) {}
@@ -415,7 +618,7 @@ absl::Status AsPacket(const FieldData& data, Packet* result) {
     case FieldData::VALUE_NOT_SET:
       *result = Packet();
   }
-  return mediapipe::OkStatus();
+  return absl::OkStatus();
 }
 
 absl::Status AsFieldData(Packet packet, FieldData* result) {
@@ -436,7 +639,7 @@ absl::Status AsFieldData(Packet packet, FieldData* result) {
         packet.GetProtoMessageLite().SerializeAsString());
     result->mutable_message_value()->set_type_url(
         TypeUrl(packet.GetProtoMessageLite().GetTypeName()));
-    return mediapipe::OkStatus();
+    return absl::OkStatus();
   }
 
   if (kTypeIds->count(packet.GetTypeId()) == 0) {
@@ -473,7 +676,7 @@ absl::Status AsFieldData(Packet packet, FieldData* result) {
       result->set_string_value(packet.Get<std::string>());
       break;
   }
-  return mediapipe::OkStatus();
+  return absl::OkStatus();
 }
 
 std::string TypeUrl(absl::string_view type_name) {

mediapipe/framework/tool/options_field_util.h

@@ -19,8 +19,15 @@ namespace tool {
 // Utility to read and write Packet data from protobuf fields.
 namespace options_field_util {
 
-// A chain of nested fields and indexes.
-using FieldPath = std::vector<std::pair<const FieldDescriptor*, int>>;
+// A protobuf field and index description.
+struct FieldPathEntry {
+  const FieldDescriptor* field = nullptr;
+  int index = -1;
+  std::string extension_type;
+};
+
+// A chain of nested protobuf fields and indexes.
+using FieldPath = std::vector<FieldPathEntry>;
 
 // Writes a field value into protobuf field.
 absl::Status SetField(const FieldPath& field_path, const FieldData& value,
@@ -39,21 +46,26 @@ absl::Status ReadMessage(const std::string& value, const std::string& type_name,
                          Packet* result);
 
 // Merge two options protobuf field values.
-absl::Status MergeOptionsMessages(const FieldData& base, const FieldData& over,
+absl::Status MergeMessages(const FieldData& base, const FieldData& over,
                            FieldData* result);
 
-// Returns the options protobuf for a graph.
-absl::Status GetOptionsMessage(const CalculatorGraphConfig& config,
+// Returns the requested options protobuf for a graph.
+absl::Status GetNodeOptions(const FieldData& message_data,
+                            const std::string& extension_type,
                             FieldData* result);
 
-// Returns the options protobuf for a node.
-absl::Status GetOptionsMessage(const CalculatorGraphConfig::Node& node,
+// Returns the requested options protobuf for a graph node.
+absl::Status GetGraphOptions(const FieldData& message_data,
+                             const std::string& extension_type,
                              FieldData* result);
 
 // Sets the node_options field in a Node, and clears the options field.
 void SetOptionsMessage(const FieldData& node_options,
                        CalculatorGraphConfig::Node* node);
 
+// Serialize a MessageLite to a FieldData.
+FieldData AsFieldData(const proto_ns::MessageLite& message);
+
 // Constructs a Packet for a FieldData proto.
 absl::Status AsPacket(const FieldData& data, Packet* result);
 

mediapipe/framework/tool/options_syntax_util.cc

@@ -5,17 +5,42 @@
 #include <tuple>
 #include <vector>
 
+#include "absl/strings/match.h"
 #include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
 #include "mediapipe/framework/packet.h"
 #include "mediapipe/framework/packet_type.h"
 #include "mediapipe/framework/port/advanced_proto_inc.h"
 #include "mediapipe/framework/port/any_proto.h"
 #include "mediapipe/framework/port/status.h"
 #include "mediapipe/framework/tool/name_util.h"
+#include "mediapipe/framework/tool/options_registry.h"
 
 namespace mediapipe {
 namespace tool {
 
+namespace {
+
+// StrSplit Delimiter to split strings at single colon tokens, ignoring
+// double-colon tokens.
+class SingleColonDelimiter {
+ public:
+  SingleColonDelimiter() {}
+  absl::string_view Find(absl::string_view text, size_t pos) const {
+    while (pos < text.length()) {
+      size_t p = text.find(':', pos);
+      p = (p == absl::string_view::npos) ? text.length() : p;
+      if (p >= text.length() - 1 || text[p + 1] != ':') {
+        return text.substr(p, 1);
+      }
+      pos = p + 2;
+    }
+    return text.substr(text.length(), 0);
+  }
+};
+
+}  // namespace
+
 // Helper functions for parsing the graph options syntax.
 class OptionsSyntaxUtil::OptionsSyntaxHelper {
  public:
@@ -31,13 +56,32 @@ class OptionsSyntaxUtil::OptionsSyntaxHelper {
   // Returns the option protobuf field name for a tag or packet name.
   absl::string_view OptionFieldName(absl::string_view name) { return name; }
 
+  // Return the extension-type specified for an option field.
+  absl::string_view ExtensionType(absl::string_view option_name) {
+    constexpr absl::string_view kExt = "Ext::";
+    if (absl::StartsWithIgnoreCase(option_name, kExt)) {
+      return option_name.substr(kExt.size());
+    }
+    return "";
+  }
+
+  // Returns the field names encoded in an options tag.
+  std::vector<absl::string_view> OptionTagNames(absl::string_view tag) {
+    if (absl::StartsWith(tag, syntax_.tag_name)) {
+      tag = tag.substr(syntax_.tag_name.length());
+    } else if (absl::StartsWith(tag, syntax_.packet_name)) {
+      tag = tag.substr(syntax_.packet_name.length());
+    }
+    if (absl::StartsWith(tag, syntax_.separator)) {
+      tag = tag.substr(syntax_.separator.length());
+    }
+    return absl::StrSplit(tag, syntax_.separator);
+  }
+
   // Returns the field-path for an option stream-tag.
-  FieldPath OptionFieldPath(const std::string& tag,
+  FieldPath OptionFieldPath(absl::string_view tag,
                             const Descriptor* descriptor) {
-    int prefix = syntax_.tag_name.length() + syntax_.separator.length();
-    std::string suffix = tag.substr(prefix);
-    std::vector<absl::string_view> name_tags =
-        absl::StrSplit(suffix, syntax_.separator);
+    std::vector<absl::string_view> name_tags = OptionTagNames(tag);
     FieldPath result;
     for (absl::string_view name_tag : name_tags) {
       if (name_tag.empty()) {
@@ -46,8 +90,16 @@ class OptionsSyntaxUtil::OptionsSyntaxHelper {
       absl::string_view option_name = OptionFieldName(name_tag);
       int index;
       if (absl::SimpleAtoi(option_name, &index)) {
-        result.back().second = index;
+        result.back().index = index;
+      }
+      if (!ExtensionType(option_name).empty()) {
+        std::string extension_type = std::string(ExtensionType(option_name));
+        result.push_back({nullptr, 0, extension_type});
+        descriptor = OptionsRegistry::GetProtobufDescriptor(extension_type);
       } else {
+        if (descriptor == nullptr) {
+          break;
+        }
         auto field = descriptor->FindFieldByName(std::string(option_name));
         descriptor = field ? field->message_type() : nullptr;
         result.push_back({std::move(field), 0});
@@ -78,7 +130,7 @@ class OptionsSyntaxUtil::OptionsSyntaxHelper {
   }
 
   // Converts slash-separated field names into a tag name.
-  std::string OptionFieldsTag(const std::string& option_names) {
+  std::string OptionFieldsTag(absl::string_view option_names) {
     std::string tag_prefix = syntax_.tag_name + syntax_.separator;
     std::vector<absl::string_view> names = absl::StrSplit(option_names, '/');
     if (!names.empty() && names[0] == syntax_.tag_name) {
@@ -129,15 +181,18 @@ OptionsSyntaxUtil::OptionsSyntaxUtil(const std::string& tag_name,
 
 OptionsSyntaxUtil::~OptionsSyntaxUtil() {}
 
-std::string OptionsSyntaxUtil::OptionFieldsTag(
-    const std::string& option_names) {
+std::string OptionsSyntaxUtil::OptionFieldsTag(absl::string_view option_names) {
   return syntax_helper_->OptionFieldsTag(option_names);
 }
 
 OptionsSyntaxUtil::FieldPath OptionsSyntaxUtil::OptionFieldPath(
-    const std::string& tag, const Descriptor* descriptor) {
+    absl::string_view tag, const Descriptor* descriptor) {
   return syntax_helper_->OptionFieldPath(tag, descriptor);
 }
+std::vector<absl::string_view> OptionsSyntaxUtil::StrSplitTags(
+    absl::string_view tag_and_name) {
+  return absl::StrSplit(tag_and_name, SingleColonDelimiter());
+}
 
 }  // namespace tool
 }  // namespace mediapipe

mediapipe/framework/tool/options_syntax_util.h

@@ -28,12 +28,15 @@ class OptionsSyntaxUtil {
   ~OptionsSyntaxUtil();
 
   // Converts slash-separated field names into a tag name.
-  std::string OptionFieldsTag(const std::string& option_names);
+  std::string OptionFieldsTag(absl::string_view option_names);
 
   // Returns the field-path for an option stream-tag.
-  FieldPath OptionFieldPath(const std::string& tag,
+  FieldPath OptionFieldPath(absl::string_view tag,
                             const Descriptor* descriptor);
 
+  // Splits a std::string into "tag" and "name" delimited by a single colon.
+  std::vector<absl::string_view> StrSplitTags(absl::string_view tag_and_name);
+
  private:
   class OptionsSyntaxHelper;
   std::unique_ptr<OptionsSyntaxHelper> syntax_helper_;

mediapipe/framework/tool/options_util.cc

@@ -7,6 +7,7 @@
 
 #include "absl/strings/ascii.h"
 #include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
 #include "mediapipe/framework/calculator_context.h"
 #include "mediapipe/framework/input_stream_shard.h"
 #include "mediapipe/framework/output_side_packet.h"
@@ -24,50 +25,77 @@
 namespace mediapipe {
 namespace tool {
 
+using options_field_util::FieldPath;
+using options_field_util::GetField;
+using options_field_util::GetGraphOptions;
+using options_field_util::GetNodeOptions;
+using options_field_util::MergeField;
+using options_field_util::MergeMessages;
+
+// Returns the type for the root options message if specified.
+std::string ExtensionType(const std::string& option_fields_tag) {
+  OptionsSyntaxUtil syntax_util;
+  options_field_util::FieldPath field_path =
+      syntax_util.OptionFieldPath(option_fields_tag, nullptr);
+  std::string result = !field_path.empty() ? field_path[0].extension_type : "";
+  return !result.empty() ? result : "*";
+}
+
+// Constructs a FieldPath for field names starting at a message type.
+FieldPath GetPath(const std::string& path_tag,
+                  const std::string& message_type) {
+  OptionsSyntaxUtil syntax_util;
+  const Descriptor* descriptor =
+      OptionsRegistry::GetProtobufDescriptor(message_type);
+  return syntax_util.OptionFieldPath(path_tag, descriptor);
+}
+
+// Returns the message type for a FieldData.
+std::string MessageType(FieldData message) {
+  return options_field_util::ParseTypeUrl(
+      std::string(message.message_value().type_url()));
+}
+
 // Copy literal options from graph_options to node_options.
 absl::Status CopyLiteralOptions(CalculatorGraphConfig::Node parent_node,
                                 CalculatorGraphConfig* config) {
   Status status;
-  FieldData config_options, parent_node_options, graph_options;
-  status.Update(
-      options_field_util::GetOptionsMessage(*config, &config_options));
-  status.Update(
-      options_field_util::GetOptionsMessage(parent_node, &parent_node_options));
-  status.Update(options_field_util::MergeOptionsMessages(
-      config_options, parent_node_options, &graph_options));
-  const Descriptor* options_descriptor =
-      OptionsRegistry::GetProtobufDescriptor(options_field_util::ParseTypeUrl(
-          std::string(graph_options.message_value().type_url())));
-  if (!options_descriptor) {
-    return status;
-  }
+  FieldData graph_data = options_field_util::AsFieldData(*config);
+  FieldData parent_data = options_field_util::AsFieldData(parent_node);
 
   OptionsSyntaxUtil syntax_util;
   for (auto& node : *config->mutable_node()) {
-    FieldData node_data;
-    status.Update(options_field_util::GetOptionsMessage(node, &node_data));
-    if (!node_data.has_message_value() || node.option_value_size() == 0) {
-      continue;
-    }
-    const Descriptor* node_options_descriptor =
-        OptionsRegistry::GetProtobufDescriptor(options_field_util::ParseTypeUrl(
-            std::string(node_data.message_value().type_url())));
-    if (!node_options_descriptor) {
-      continue;
-    }
+    FieldData node_data = options_field_util::AsFieldData(node);
+
     for (const std::string& option_def : node.option_value()) {
-      std::vector<std::string> tag_and_name = absl::StrSplit(option_def, ':');
+      std::vector<absl::string_view> tag_and_name =
+          syntax_util.StrSplitTags(option_def);
       std::string graph_tag = syntax_util.OptionFieldsTag(tag_and_name[1]);
+      std::string graph_extension_type = ExtensionType(graph_tag);
       std::string node_tag = syntax_util.OptionFieldsTag(tag_and_name[0]);
-      FieldData packet_data;
-      status.Update(options_field_util::GetField(
-          syntax_util.OptionFieldPath(graph_tag, options_descriptor),
-          graph_options, &packet_data));
-      status.Update(options_field_util::MergeField(
-          syntax_util.OptionFieldPath(node_tag, node_options_descriptor),
-          packet_data, &node_data));
+      std::string node_extension_type = ExtensionType(node_tag);
+      FieldData graph_options;
+      GetGraphOptions(graph_data, graph_extension_type, &graph_options)
+          .IgnoreError();
+      FieldData parent_options;
+      GetNodeOptions(parent_data, graph_extension_type, &parent_options)
+          .IgnoreError();
+      status.Update(
+          MergeMessages(graph_options, parent_options, &graph_options));
+      FieldData node_options;
+      status.Update(
+          GetNodeOptions(node_data, node_extension_type, &node_options));
+      if (!node_options.has_message_value() ||
+          !graph_options.has_message_value()) {
+        continue;
+      }
+      FieldPath graph_path = GetPath(graph_tag, MessageType(graph_options));
+      FieldPath node_path = GetPath(node_tag, MessageType(node_options));
+      FieldData packet_data;
+      status.Update(GetField(graph_path, graph_options, &packet_data));
+      status.Update(MergeField(node_path, packet_data, &node_options));
+      options_field_util::SetOptionsMessage(node_options, &node);
     }
-    options_field_util::SetOptionsMessage(node_data, &node);
   }
   return status;
 }

mediapipe/framework/tool/options_util_test.cc

@@ -15,6 +15,7 @@
 #include <memory>
 #include <vector>
 
+#include "absl/strings/string_view.h"
 #include "mediapipe/framework/calculator_framework.h"
 #include "mediapipe/framework/deps/message_matchers.h"
 #include "mediapipe/framework/port/gtest.h"
@@ -22,6 +23,7 @@
 #include "mediapipe/framework/port/status_matchers.h"
 #include "mediapipe/framework/testdata/night_light_calculator.pb.h"
 #include "mediapipe/framework/tool/node_chain_subgraph.pb.h"
+#include "mediapipe/framework/tool/options_field_util.h"
 #include "mediapipe/framework/tool/options_registry.h"
 #include "mediapipe/framework/tool/options_syntax_util.h"
 
@@ -51,6 +53,35 @@ class NightLightCalculator : public CalculatorBase {
 };
 REGISTER_CALCULATOR(NightLightCalculator);
 
+using tool::options_field_util::FieldPath;
+
+// Validates FieldPathEntry contents.
+bool Equals(const tool::options_field_util::FieldPathEntry& entry,
+            const std::string& field_name, int index,
+            const std::string& extension_type) {
+  const std::string& name = entry.field ? entry.field->name() : "";
+  return name == field_name && entry.index == index &&
+         entry.extension_type == extension_type;
+}
+
+// Serializes a MessageLite into FieldData.message_value.
+FieldData AsFieldData(const proto_ns::MessageLite& message) {
+  FieldData result;
+  *result.mutable_message_value()->mutable_value() =
+      message.SerializeAsString();
+  result.mutable_message_value()->set_type_url(message.GetTypeName());
+  return result;
+}
+
+// Returns the type for the root options message if specified.
+std::string ExtensionType(const std::string& option_fields_tag) {
+  tool::OptionsSyntaxUtil syntax_util;
+  tool::options_field_util::FieldPath field_path =
+      syntax_util.OptionFieldPath(option_fields_tag, nullptr);
+  std::string result = !field_path.empty() ? field_path[0].extension_type : "";
+  return !result.empty() ? result : "*";
+}
+
 // Tests for calculator and graph options.
 //
 class OptionsUtilTest : public ::testing::Test {
@@ -150,8 +181,8 @@ TEST_F(OptionsUtilTest, OptionsSyntaxUtil) {
     EXPECT_EQ(tag, "OPTIONS/sub_options/num_lights");
     field_path = syntax_util.OptionFieldPath(tag, descriptor);
     EXPECT_EQ(field_path.size(), 2);
-    EXPECT_EQ(field_path[0].first->name(), "sub_options");
-    EXPECT_EQ(field_path[1].first->name(), "num_lights");
+    EXPECT_EQ(field_path[0].field->name(), "sub_options");
+    EXPECT_EQ(field_path[1].field->name(), "num_lights");
   }
   {
     // A tag syntax with a text-coded separator.
@@ -160,10 +191,100 @@ TEST_F(OptionsUtilTest, OptionsSyntaxUtil) {
     EXPECT_EQ(tag, "OPTIONS_Z0Z_sub_options_Z0Z_num_lights");
     field_path = syntax_util.OptionFieldPath(tag, descriptor);
     EXPECT_EQ(field_path.size(), 2);
-    EXPECT_EQ(field_path[0].first->name(), "sub_options");
-    EXPECT_EQ(field_path[1].first->name(), "num_lights");
+    EXPECT_EQ(field_path[0].field->name(), "sub_options");
+    EXPECT_EQ(field_path[1].field->name(), "num_lights");
   }
 }
 
+TEST_F(OptionsUtilTest, OptionFieldPath) {
+  tool::OptionsSyntaxUtil syntax_util;
+  std::vector<absl::string_view> split;
+  split = syntax_util.StrSplitTags("a/graph/option:a/node/option");
+  EXPECT_EQ(2, split.size());
+  EXPECT_EQ(split[0], "a/graph/option");
+  EXPECT_EQ(split[1], "a/node/option");
+  split = syntax_util.StrSplitTags("Ext::a/graph/option:Ext::a/node/option");
+  EXPECT_EQ(2, split.size());
+  EXPECT_EQ(split[0], "Ext::a/graph/option");
+  EXPECT_EQ(split[1], "Ext::a/node/option");
+
+  split =
+      syntax_util.StrSplitTags("chain_length:options/sub_options/num_lights");
+  EXPECT_EQ(2, split.size());
+  EXPECT_EQ(split[0], "chain_length");
+  EXPECT_EQ(split[1], "options/sub_options/num_lights");
+  const tool::Descriptor* descriptor =
+      tool::OptionsRegistry::GetProtobufDescriptor(
+          "mediapipe.NightLightCalculatorOptions");
+  tool::options_field_util::FieldPath field_path =
+      syntax_util.OptionFieldPath(split[1], descriptor);
+  EXPECT_EQ(field_path.size(), 2);
+  EXPECT_EQ(field_path[0].field->name(), "sub_options");
+  EXPECT_EQ(field_path[1].field->name(), "num_lights");
+}
+
+TEST_F(OptionsUtilTest, FindOptionsMessage) {
+  tool::OptionsSyntaxUtil syntax_util;
+  std::vector<absl::string_view> split;
+  split =
+      syntax_util.StrSplitTags("chain_length:options/sub_options/num_lights");
+  EXPECT_EQ(2, split.size());
+  EXPECT_EQ(split[0], "chain_length");
+  EXPECT_EQ(split[1], "options/sub_options/num_lights");
+  const tool::Descriptor* descriptor =
+      tool::OptionsRegistry::GetProtobufDescriptor(
+          "mediapipe.NightLightCalculatorOptions");
+  tool::options_field_util::FieldPath field_path =
+      syntax_util.OptionFieldPath(split[1], descriptor);
+  EXPECT_EQ(field_path.size(), 2);
+  EXPECT_TRUE(Equals(field_path[0], "sub_options", 0, ""));
+  EXPECT_TRUE(Equals(field_path[1], "num_lights", 0, ""));
+
+  {
+    // NightLightCalculatorOptions in Node.options.
+    CalculatorGraphConfig::Node node;
+    NightLightCalculatorOptions* options =
+        node.mutable_options()->MutableExtension(
+            NightLightCalculatorOptions::ext);
+    options->mutable_sub_options()->add_num_lights(33);
+
+    // Retrieve the specified option.
+    FieldData node_data = AsFieldData(node);
+    auto path = field_path;
+    std::string node_extension_type = ExtensionType(std::string(split[1]));
+    FieldData node_options;
+    MP_EXPECT_OK(tool::options_field_util::GetNodeOptions(
+        node_data, node_extension_type, &node_options));
+    FieldData packet_data;
+    MP_EXPECT_OK(tool::options_field_util::GetField(field_path, node_options,
+                                                    &packet_data));
+    EXPECT_EQ(packet_data.value_case(), FieldData::kInt32Value);
+    EXPECT_EQ(packet_data.int32_value(), 33);
+  }
+
+  {
+    // NightLightCalculatorOptions in Node.node_options.
+    CalculatorGraphConfig::Node node;
+    NightLightCalculatorOptions options;
+    options.mutable_sub_options()->add_num_lights(33);
+    node.add_node_options()->PackFrom(options);
+
+    // Retrieve the specified option.
+    FieldData node_data = AsFieldData(node);
+    auto path = field_path;
+    std::string node_extension_type = ExtensionType(std::string(split[1]));
+    FieldData node_options;
+    MP_EXPECT_OK(tool::options_field_util::GetNodeOptions(
+        node_data, node_extension_type, &node_options));
+    FieldData packet_data;
+    MP_EXPECT_OK(tool::options_field_util::GetField(field_path, node_options,
+                                                    &packet_data));
+    EXPECT_EQ(packet_data.value_case(), FieldData::kInt32Value);
+    EXPECT_EQ(packet_data.int32_value(), 33);
+  }
+
+  // TODO: Test with specified extension_type.
+}
+
 }  // namespace
 }  // namespace mediapipe

mediapipe/gpu/BUILD

@@ -207,16 +207,20 @@ cc_library(
 
 cc_library(
     name = "gpu_buffer",
+    srcs = ["gpu_buffer.cc"],
     hdrs = ["gpu_buffer.h"],
     visibility = ["//visibility:public"],
     deps = [
         ":gl_base",
+        ":gl_context",
         ":gpu_buffer_format",
+        "//mediapipe/framework/formats:image_frame",
     ] + select({
         "//conditions:default": [
             ":gl_texture_buffer",
         ],
         "//mediapipe:ios": [
+            "//mediapipe/objc:util",
             "//mediapipe/objc:CFHolder",
         ],
         "//mediapipe:macos": [
@@ -478,6 +482,7 @@ cc_library(
         "//mediapipe:ios": [
             ":pixel_buffer_pool_util",
             "//mediapipe/objc:CFHolder",
+            "//mediapipe/objc:util",
         ],
         "//mediapipe:macos": [
             ":pixel_buffer_pool_util",
@@ -498,55 +503,40 @@ cc_library(
     ],
 )
 
-HELPER_ANDROID_SRCS = [
-    "gl_calculator_helper_impl_android.cc",
-    "gl_calculator_helper_impl_common.cc",
-]
-
-HELPER_ANDROID_HDRS = [
-    "egl_surface_holder.h",
-]
-
-HELPER_COMMON_SRCS = [
-    "gl_calculator_helper.cc",
-]
-
-HELPER_COMMON_HDRS = [
-    "gl_calculator_helper.h",
-    "gl_calculator_helper_impl.h",
-]
-
-HELPER_IOS_SRCS = [
-    "gl_calculator_helper_impl_ios.mm",
-    "gl_calculator_helper_impl_common.cc",
-]
-
-HELPER_IOS_FRAMEWORKS = [
-    "AVFoundation",
-    "CoreVideo",
-    "CoreGraphics",
-    "CoreMedia",
-    "GLKit",
-    "QuartzCore",
-] + select({
-    "//conditions:default": [
-        "OpenGLES",
+cc_library(
+    name = "egl_surface_holder",
+    hdrs = ["egl_surface_holder.h"],
+    deps = [
+        ":gl_base",
+        "@com_google_absl//absl/synchronization",
     ],
-    "//mediapipe:macos": [
-        "OpenGL",
-        "AppKit",
-    ],
-})
+)
 
 cc_library(
     name = "gl_calculator_helper",
-    srcs = select({
-        "//conditions:default": HELPER_COMMON_SRCS + HELPER_ANDROID_SRCS,
-        "//mediapipe:apple": [],
-    }),
-    hdrs = HELPER_COMMON_HDRS + select({
-        "//conditions:default": HELPER_ANDROID_HDRS,
-        "//mediapipe:apple": [],
+    srcs = [
+        "gl_calculator_helper.cc",
+        "gl_calculator_helper_impl_common.cc",
+    ],
+    hdrs = [
+        "gl_calculator_helper.h",
+        "gl_calculator_helper_impl.h",
+    ],
+    linkopts = select({
+        "//conditions:default": [],
+        "//mediapipe:apple": [
+            "-framework AVFoundation",
+            "-framework CoreVideo",
+            "-framework CoreGraphics",
+            "-framework CoreMedia",
+            "-framework GLKit",
+            "-framework QuartzCore",
+        ],
+    }) + select({
+        "//conditions:default": [],
+        "//mediapipe:macos": [
+            "-framework AppKit",
+        ],
     }),
     visibility = ["//visibility:public"],
     deps = [
@@ -582,34 +572,20 @@ cc_library(
     ] + select({
         "//conditions:default": [
         ],
-        "//mediapipe:apple": [
-            ":gl_calculator_helper_ios",
-            "//mediapipe/objc:util",
-            "//mediapipe/objc:CFHolder",
-        ],
+        "//mediapipe:apple": [],
     }),
 )
 
+# TODO: remove
 objc_library(
     name = "gl_calculator_helper_ios",
-    srcs = HELPER_COMMON_SRCS + HELPER_IOS_SRCS,
-    hdrs = HELPER_COMMON_HDRS,
     copts = [
         "-Wno-shorten-64-to-32",
         "-std=c++17",
     ],
-    sdk_frameworks = HELPER_IOS_FRAMEWORKS,
     visibility = ["//visibility:public"],
     deps = [
-        ":gl_base",
-        ":gl_context",
-        ":gpu_buffer",
-        ":gpu_buffer_multi_pool",
-        ":gpu_service",
-        ":gpu_shared_data_internal",
-        ":shader_util",
-        "//mediapipe/framework:calculator_framework",
-        "//mediapipe/framework/formats:image",
+        ":gl_calculator_helper",
         "//mediapipe/objc:mediapipe_framework_ios",
         "//mediapipe/objc:util",
     ],
@@ -769,6 +745,7 @@ cc_library(
     srcs = ["gl_surface_sink_calculator.cc"],
     visibility = ["//visibility:public"],
     deps = [
+        ":egl_surface_holder",
         ":gl_calculator_helper",
         ":gl_quad_renderer",
         ":gpu_buffer",

mediapipe/gpu/gl_calculator_helper.cc

@@ -24,15 +24,8 @@
 #include "mediapipe/gpu/gpu_buffer.h"
 #include "mediapipe/gpu/gpu_service.h"
 
-#ifdef __APPLE__
-#include "mediapipe/objc/util.h"
-#endif
-
 namespace mediapipe {
 
-GlTexture::GlTexture(GLuint name, int width, int height)
-    : name_(name), width_(width), height_(height), target_(GL_TEXTURE_2D) {}
-
 // The constructor and destructor need to be defined here so that
 // std::unique_ptr can see the full definition of GlCalculatorHelperImpl.
 // In the header, it is an incomplete type.

mediapipe/gpu/gl_calculator_helper.h

@@ -31,8 +31,6 @@
 
 #ifdef __APPLE__
 #include <CoreVideo/CoreVideo.h>
-
-#include "mediapipe/objc/CFHolder.h"
 #endif  // __APPLE__
 
 namespace mediapipe {
@@ -42,14 +40,6 @@ class GlTexture;
 class GpuResources;
 struct GpuSharedData;
 
-#ifdef __APPLE__
-#if TARGET_OS_OSX
-typedef CVOpenGLTextureRef CVTextureType;
-#else
-typedef CVOpenGLESTextureRef CVTextureType;
-#endif  // TARGET_OS_OSX
-#endif  // __APPLE__
-
 using ImageFrameSharedPtr = std::shared_ptr<ImageFrame>;
 
 // TODO: remove this and Process below, or make Process available
@@ -174,14 +164,12 @@ class GlCalculatorHelper {
 class GlTexture {
  public:
   GlTexture() {}
-  GlTexture(GLuint name, int width, int height);
-
   ~GlTexture() { Release(); }
 
-  int width() const { return width_; }
-  int height() const { return height_; }
-  GLenum target() const { return target_; }
-  GLuint name() const { return name_; }
+  int width() const { return view_.width(); }
+  int height() const { return view_.height(); }
+  GLenum target() const { return view_.target(); }
+  GLuint name() const { return view_.name(); }
 
   // Returns a buffer that can be sent to another calculator.
   // & manages sync token
@@ -190,26 +178,12 @@ class GlTexture {
   std::unique_ptr<T> GetFrame() const;
 
   // Releases texture memory & manages sync token
-  void Release();
+  void Release() { view_.Release(); }
 
  private:
+  explicit GlTexture(GlTextureView view) : view_(std::move(view)) {}
   friend class GlCalculatorHelperImpl;
-  GlCalculatorHelperImpl* helper_impl_ = nullptr;
-  GLuint name_ = 0;
-  int width_ = 0;
-  int height_ = 0;
-  GLenum target_ = GL_TEXTURE_2D;
-
-#ifdef MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
-  // For CVPixelBufferRef-based rendering
-  CFHolder<CVTextureType> cv_texture_;
-#else
-  // Keeps track of whether this texture mapping is for read access, so that
-  // we can create a consumer sync point when releasing it.
-  bool for_reading_ = false;
-#endif
-  GpuBuffer gpu_buffer_;
-  int plane_ = 0;
+  GlTextureView view_;
 };
 
 // Returns the entry with the given tag if the collection uses tags, with the

mediapipe/gpu/gl_calculator_helper_impl.h

@@ -58,19 +58,14 @@ class GlCalculatorHelperImpl {
   GlContext& GetGlContext() const;
 
   // For internal use.
-  void ReadTexture(const GlTexture& texture, void* output, size_t size);
+  static void ReadTexture(const GlTextureView& view, void* output, size_t size);
 
  private:
   // Makes a GpuBuffer accessible as a texture in the GL context.
-  GlTexture MapGpuBuffer(const GpuBuffer& gpu_buffer, int plane);
-
-#if !MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
-  GlTexture MapGlTextureBuffer(const GlTextureBufferSharedPtr& texture_buffer);
-  GlTextureBufferSharedPtr MakeGlTextureBuffer(const ImageFrame& image_frame);
-#endif  // !MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
-
-  // Sets default texture filtering parameters.
-  void SetStandardTextureParams(GLenum target, GLint internal_format);
+  GlTexture MapGpuBuffer(const GpuBuffer& gpu_buffer, int plane,
+                         bool for_reading);
+  void AttachGlTexture(GlTexture& texture, const GpuBuffer& gpu_buffer,
+                       int plane, bool for_reading);
 
   // Create the framebuffer for rendering.
   void CreateFramebuffer();
@@ -80,10 +75,6 @@ class GlCalculatorHelperImpl {
   GLuint framebuffer_ = 0;
 
   GpuResources& gpu_resources_;
-
-  // Necessary to compute for a given GlContext in order to properly enforce the
-  // SetStandardTextureParams.
-  bool can_linear_filter_float_textures_;
 };
 
 }  // namespace mediapipe

mediapipe/gpu/gl_calculator_helper_impl_android.cc

@@ -1,102 +0,0 @@
-// Copyright 2019 The MediaPipe Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include <memory>
-
-#include "mediapipe/gpu/gl_calculator_helper_impl.h"
-#include "mediapipe/gpu/gpu_shared_data_internal.h"
-
-namespace mediapipe {
-
-// TODO: move this method to GlCalculatorHelper, then we can
-// access its framebuffer instead of requiring that one is already set.
-template <>
-std::unique_ptr<ImageFrame> GlTexture::GetFrame<ImageFrame>() const {
-  auto output =
-      absl::make_unique<ImageFrame>(ImageFormat::SRGBA, width_, height_,
-                                    ImageFrame::kGlDefaultAlignmentBoundary);
-
-  CHECK(helper_impl_);
-  helper_impl_->ReadTexture(*this, output->MutablePixelData(),
-                            output->PixelDataSize());
-
-  return output;
-}
-
-template <>
-std::unique_ptr<GpuBuffer> GlTexture::GetFrame<GpuBuffer>() const {
-#ifdef __EMSCRIPTEN__
-  // When WebGL is used, the GL context may be spontaneously lost which can
-  // cause GpuBuffer allocations to fail. In that case, return a dummy buffer
-  // to allow processing of the current frame complete.
-  if (!gpu_buffer_) {
-    return std::make_unique<GpuBuffer>();
-  }
-#endif  // __EMSCRIPTEN__
-
-  CHECK(gpu_buffer_);
-  // Inform the GlTextureBuffer that we have produced new content, and create
-  // a producer sync point.
-  gpu_buffer_.GetGlTextureBufferSharedPtr()->Updated(
-      helper_impl_->GetGlContext().CreateSyncToken());
-
-#ifdef __ANDROID__
-  // On (some?) Android devices, the texture may need to be explicitly
-  // detached from the current framebuffer.
-  // TODO: is this necessary even with the unbind in BindFramebuffer?
-  // It is not clear if this affected other contexts too, but let's keep it
-  // while in doubt.
-  GLint type = GL_NONE;
-  glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
-                                        GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
-                                        &type);
-  if (type == GL_TEXTURE) {
-    GLint color_attachment = 0;
-    glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
-                                          GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
-                                          &color_attachment);
-    if (color_attachment == name_) {
-      glBindFramebuffer(GL_FRAMEBUFFER, 0);
-    }
-  }
-
-  // Some Android drivers log a GL_INVALID_ENUM error after the first
-  // glGetFramebufferAttachmentParameteriv call if there is no bound object,
-  // even though it should be ok to ask for the type and get back GL_NONE.
-  // Let's just ignore any pending errors here.
-  GLenum error;
-  while ((error = glGetError()) != GL_NO_ERROR) {
-  }
-
-#endif  // __ANDROID__
-  return absl::make_unique<GpuBuffer>(gpu_buffer_);
-}
-
-void GlTexture::Release() {
-  if (for_reading_ && gpu_buffer_) {
-    // Inform the GlTextureBuffer that we have finished accessing its contents,
-    // and create a consumer sync point.
-    gpu_buffer_.GetGlTextureBufferSharedPtr()->DidRead(
-        helper_impl_->GetGlContext().CreateSyncToken());
-  }
-  helper_impl_ = nullptr;
-  for_reading_ = false;
-  gpu_buffer_ = nullptr;
-  plane_ = 0;
-  name_ = 0;
-  width_ = 0;
-  height_ = 0;
-}
-
-}  // namespace mediapipe

mediapipe/gpu/gl_calculator_helper_impl_common.cc

@@ -25,17 +25,6 @@ GlCalculatorHelperImpl::GlCalculatorHelperImpl(CalculatorContext* cc,
                                                GpuResources* gpu_resources)
     : gpu_resources_(*gpu_resources) {
   gl_context_ = gpu_resources_.gl_context(cc);
-// GL_ES_VERSION_2_0 and up (at least through ES 3.2) may contain the extension.
-// Checking against one also checks against higher ES versions. So this checks
-// against GLES >= 2.0.
-#if GL_ES_VERSION_2_0
-  // No linear float filtering by default, check extensions.
-  can_linear_filter_float_textures_ =
-      gl_context_->HasGlExtension("OES_texture_float_linear");
-#else
-  // Any float32 texture we create should automatically have linear filtering.
-  can_linear_filter_float_textures_ = true;
-#endif  // GL_ES_VERSION_2_0
 }
 
 GlCalculatorHelperImpl::~GlCalculatorHelperImpl() {
@@ -101,98 +90,59 @@ void GlCalculatorHelperImpl::BindFramebuffer(const GlTexture& dst) {
 #endif
 }
 
-void GlCalculatorHelperImpl::SetStandardTextureParams(GLenum target,
-                                                      GLint internal_format) {
-  // Default to using linear filter everywhere. For float32 textures, fall back
-  // to GL_NEAREST if linear filtering unsupported.
-  GLint filter;
-  switch (internal_format) {
-    case GL_R32F:
-    case GL_RG32F:
-    case GL_RGBA32F:
-      // 32F (unlike 16f) textures do not always support texture filtering
-      // (According to OpenGL ES specification [TEXTURE IMAGE SPECIFICATION])
-      filter = can_linear_filter_float_textures_ ? GL_LINEAR : GL_NEAREST;
-      break;
-    default:
-      filter = GL_LINEAR;
-  }
-  glTexParameteri(target, GL_TEXTURE_MIN_FILTER, filter);
-  glTexParameteri(target, GL_TEXTURE_MAG_FILTER, filter);
-  glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-  glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+GlTexture GlCalculatorHelperImpl::MapGpuBuffer(const GpuBuffer& gpu_buffer,
+                                               int plane, bool for_reading) {
+  GlTextureView view = gpu_buffer.GetGlTextureView(plane, for_reading);
+
+  if (gpu_buffer.format() != GpuBufferFormat::kUnknown) {
+    // TODO: do the params need to be reset here??
+    glBindTexture(view.target(), view.name());
+    GlTextureInfo info = GlTextureInfoForGpuBufferFormat(
+        gpu_buffer.format(), view.plane(), GetGlVersion());
+    gl_context_->SetStandardTextureParams(view.target(),
+                                          info.gl_internal_format);
+    glBindTexture(view.target(), 0);
   }
 
-#if !MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
-GlTexture GlCalculatorHelperImpl::CreateSourceTexture(
-    const ImageFrame& image_frame) {
-  GlTexture texture = MapGlTextureBuffer(MakeGlTextureBuffer(image_frame));
-  texture.for_reading_ = true;
-  return texture;
+  return GlTexture(std::move(view));
 }
 
 GlTexture GlCalculatorHelperImpl::CreateSourceTexture(
     const GpuBuffer& gpu_buffer) {
-  GlTexture texture = MapGpuBuffer(gpu_buffer, 0);
-  texture.for_reading_ = true;
-  return texture;
+  return MapGpuBuffer(gpu_buffer, 0, true);
 }
 
 GlTexture GlCalculatorHelperImpl::CreateSourceTexture(
     const GpuBuffer& gpu_buffer, int plane) {
-  GlTexture texture = MapGpuBuffer(gpu_buffer, plane);
-  texture.for_reading_ = true;
-  return texture;
+  return MapGpuBuffer(gpu_buffer, plane, true);
 }
 
-GlTexture GlCalculatorHelperImpl::MapGpuBuffer(const GpuBuffer& gpu_buffer,
-                                               int plane) {
-  CHECK_EQ(plane, 0);
-  return MapGlTextureBuffer(gpu_buffer.GetGlTextureBufferSharedPtr());
-}
-
-GlTexture GlCalculatorHelperImpl::MapGlTextureBuffer(
-    const GlTextureBufferSharedPtr& texture_buffer) {
-  // Insert wait call to sync with the producer.
-  texture_buffer->WaitOnGpu();
-  GlTexture texture;
-  texture.helper_impl_ = this;
-  texture.gpu_buffer_ = GpuBuffer(texture_buffer);
-  texture.plane_ = 0;
-  texture.width_ = texture_buffer->width_;
-  texture.height_ = texture_buffer->height_;
-  texture.target_ = texture_buffer->target_;
-  texture.name_ = texture_buffer->name_;
-
-  if (texture_buffer->format() != GpuBufferFormat::kUnknown) {
-    // TODO: do the params need to be reset here??
-    glBindTexture(texture.target(), texture.name());
-    GlTextureInfo info = GlTextureInfoForGpuBufferFormat(
-        texture_buffer->format(), texture.plane_, GetGlVersion());
-    SetStandardTextureParams(texture.target(), info.gl_internal_format);
-    glBindTexture(texture.target(), 0);
-  }
-
-  return texture;
-}
-
-GlTextureBufferSharedPtr GlCalculatorHelperImpl::MakeGlTextureBuffer(
+GlTexture GlCalculatorHelperImpl::CreateSourceTexture(
     const ImageFrame& image_frame) {
-  CHECK(gl_context_->IsCurrent());
-
-  auto buffer = GlTextureBuffer::Create(image_frame);
-
-  if (buffer->format_ != GpuBufferFormat::kUnknown) {
-    glBindTexture(GL_TEXTURE_2D, buffer->name_);
-    GlTextureInfo info = GlTextureInfoForGpuBufferFormat(
-        buffer->format_, /*plane=*/0, GetGlVersion());
-    SetStandardTextureParams(buffer->target_, info.gl_internal_format);
-    glBindTexture(GL_TEXTURE_2D, 0);
+  GlTexture texture =
+      MapGpuBuffer(GpuBuffer::CopyingImageFrame(image_frame), 0, true);
+  return texture;
 }
 
-  return buffer;
+template <>
+std::unique_ptr<ImageFrame> GlTexture::GetFrame<ImageFrame>() const {
+  return view_.gpu_buffer().AsImageFrame();
+}
+
+template <>
+std::unique_ptr<GpuBuffer> GlTexture::GetFrame<GpuBuffer>() const {
+  auto gpu_buffer = view_.gpu_buffer();
+#ifdef __EMSCRIPTEN__
+  // When WebGL is used, the GL context may be spontaneously lost which can
+  // cause GpuBuffer allocations to fail. In that case, return a dummy buffer
+  // to allow processing of the current frame complete.
+  if (!gpu_buffer) {
+    return std::make_unique<GpuBuffer>();
+  }
+#endif  // __EMSCRIPTEN__
+  view_.DoneWriting();
+  return absl::make_unique<GpuBuffer>(gpu_buffer);
 }
-#endif  // !MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
 
 GlTexture GlCalculatorHelperImpl::CreateDestinationTexture(
     int width, int height, GpuBufferFormat format) {
@@ -202,44 +152,9 @@ GlTexture GlCalculatorHelperImpl::CreateDestinationTexture(
 
   GpuBuffer buffer =
       gpu_resources_.gpu_buffer_pool().GetBuffer(width, height, format);
-  GlTexture texture = MapGpuBuffer(buffer, 0);
+  GlTexture texture = MapGpuBuffer(buffer, 0, false);
 
   return texture;
 }
 
-void GlCalculatorHelperImpl::ReadTexture(const GlTexture& texture, void* output,
-                                         size_t size) {
-  CHECK_GE(size, texture.width_ * texture.height_ * 4);
-
-  GLint current_fbo;
-  glGetIntegerv(GL_FRAMEBUFFER_BINDING, &current_fbo);
-  CHECK_NE(current_fbo, 0);
-
-  GLint color_attachment_name;
-  glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
-                                        GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
-                                        &color_attachment_name);
-  if (color_attachment_name != texture.name_) {
-    // Save the viewport. Note that we assume that the color attachment is a
-    // GL_TEXTURE_2D texture.
-    GLint viewport[4];
-    glGetIntegerv(GL_VIEWPORT, viewport);
-
-    // Set the data from GLTexture object.
-    glViewport(0, 0, texture.width_, texture.height_);
-    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
-                           texture.target_, texture.name_, 0);
-    glReadPixels(0, 0, texture.width_, texture.height_, GL_RGBA,
-                 GL_UNSIGNED_BYTE, output);
-
-    // Restore from the saved viewport and color attachment name.
-    glViewport(viewport[0], viewport[1], viewport[2], viewport[3]);
-    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
-                           color_attachment_name, 0);
-  } else {
-    glReadPixels(0, 0, texture.width_, texture.height_, GL_RGBA,
-                 GL_UNSIGNED_BYTE, output);
-  }
-}
-
 }  // namespace mediapipe

mediapipe/gpu/gl_calculator_helper_impl_ios.mm

@@ -1,197 +0,0 @@
-// Copyright 2019 The MediaPipe Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#include "mediapipe/gpu/gl_calculator_helper_impl.h"
-
-#if TARGET_OS_OSX
-#import <AppKit/NSOpenGL.h>
-#else
-#import <OpenGLES/EAGL.h>
-#endif  // TARGET_OS_OSX
-#import <AVFoundation/AVFoundation.h>
-
-#include "absl/memory/memory.h"
-#include "mediapipe/gpu/gpu_buffer_multi_pool.h"
-#include "mediapipe/gpu/pixel_buffer_pool_util.h"
-#include "mediapipe/objc/util.h"
-
-namespace mediapipe {
-
-#if MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
-GlTexture GlCalculatorHelperImpl::CreateSourceTexture(
-    const mediapipe::ImageFrame& image_frame) {
-  GlTexture texture;
-
-  texture.helper_impl_ = this;
-  texture.width_ = image_frame.Width();
-  texture.height_ = image_frame.Height();
-  auto format = GpuBufferFormatForImageFormat(image_frame.Format());
-
-  GlTextureInfo info = GlTextureInfoForGpuBufferFormat(format, 0, GetGlVersion());
-
-  glGenTextures(1, &texture.name_);
-  glBindTexture(GL_TEXTURE_2D, texture.name_);
-  glTexImage2D(GL_TEXTURE_2D, 0, info.gl_internal_format, texture.width_,
-               texture.height_, 0, info.gl_format, info.gl_type,
-               image_frame.PixelData());
-  SetStandardTextureParams(GL_TEXTURE_2D, info.gl_internal_format);
-  return texture;
-}
-
-GlTexture GlCalculatorHelperImpl::CreateSourceTexture(
-    const GpuBuffer& gpu_buffer) {
-  return MapGpuBuffer(gpu_buffer, 0);
-}
-
-GlTexture GlCalculatorHelperImpl::CreateSourceTexture(
-    const GpuBuffer& gpu_buffer, int plane) {
-  return MapGpuBuffer(gpu_buffer, plane);
-}
-
-GlTexture GlCalculatorHelperImpl::MapGpuBuffer(
-    const GpuBuffer& gpu_buffer, int plane) {
-  CVReturn err;
-  GlTexture texture;
-  texture.helper_impl_ = this;
-  texture.gpu_buffer_ = gpu_buffer;
-  texture.plane_ = plane;
-
-  const GlTextureInfo info =
-      GlTextureInfoForGpuBufferFormat(gpu_buffer.format(), plane, GetGlVersion());
-  // When scale is not 1, we still give the nominal size of the image.
-  texture.width_ = gpu_buffer.width();
-  texture.height_ = gpu_buffer.height();
-
-#if TARGET_OS_OSX
-  CVOpenGLTextureRef cv_texture_temp;
-  err = CVOpenGLTextureCacheCreateTextureFromImage(
-      kCFAllocatorDefault, gl_context_->cv_texture_cache(), gpu_buffer.GetCVPixelBufferRef(), NULL,
-      &cv_texture_temp);
-  NSCAssert(cv_texture_temp && !err,
-            @"Error at CVOpenGLTextureCacheCreateTextureFromImage %d", err);
-  texture.cv_texture_.adopt(cv_texture_temp);
-  texture.target_ = CVOpenGLTextureGetTarget(*texture.cv_texture_);
-  texture.name_ = CVOpenGLTextureGetName(*texture.cv_texture_);
-#else
-  CVOpenGLESTextureRef cv_texture_temp;
-  err = CVOpenGLESTextureCacheCreateTextureFromImage(
-      kCFAllocatorDefault, gl_context_->cv_texture_cache(), gpu_buffer.GetCVPixelBufferRef(), NULL,
-      GL_TEXTURE_2D, info.gl_internal_format, texture.width_ / info.downscale,
-      texture.height_ / info.downscale, info.gl_format, info.gl_type, plane,
-      &cv_texture_temp);
-  NSCAssert(cv_texture_temp && !err,
-            @"Error at CVOpenGLESTextureCacheCreateTextureFromImage %d", err);
-  texture.cv_texture_.adopt(cv_texture_temp);
-  texture.target_ = CVOpenGLESTextureGetTarget(*texture.cv_texture_);
-  texture.name_ = CVOpenGLESTextureGetName(*texture.cv_texture_);
-#endif  // TARGET_OS_OSX
-
-  glBindTexture(texture.target(), texture.name());
-  SetStandardTextureParams(texture.target(), info.gl_internal_format);
-
-  return texture;
-}
-#endif  // MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
-
-template<>
-std::unique_ptr<ImageFrame> GlTexture::GetFrame<ImageFrame>() const {
-#if MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
-  if (gpu_buffer_.GetCVPixelBufferRef()) {
-    return CreateImageFrameForCVPixelBuffer(gpu_buffer_.GetCVPixelBufferRef());
-  }
-
-  ImageFormat::Format image_format =
-      ImageFormatForGpuBufferFormat(gpu_buffer_.format());
-  CHECK(helper_impl_);
-  GlTextureInfo info =
-      GlTextureInfoForGpuBufferFormat(gpu_buffer_.format(), plane_, helper_impl_->GetGlVersion());
-
-  auto output = absl::make_unique<ImageFrame>(
-      image_format, width_, height_);
-
-  glReadPixels(0, 0, width_, height_, info.gl_format, info.gl_type,
-               output->MutablePixelData());
-  return output;
-#else
-  CHECK(gpu_buffer_.format() == GpuBufferFormat::kBGRA32);
-  auto output =
-      absl::make_unique<ImageFrame>(ImageFormat::SRGBA, width_, height_,
-                                    ImageFrame::kGlDefaultAlignmentBoundary);
-
-  CHECK(helper_impl_);
-  helper_impl_->ReadTexture(*this, output->MutablePixelData(), output->PixelDataSize());
-
-  return output;
-#endif  // MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
-}
-
-template<>
-std::unique_ptr<GpuBuffer> GlTexture::GetFrame<GpuBuffer>() const {
-  NSCAssert(gpu_buffer_, @"gpu_buffer_ must be valid");
-#if TARGET_IPHONE_SIMULATOR
-  CVPixelBufferRef pixel_buffer = gpu_buffer_.GetCVPixelBufferRef();
-  CVReturn err = CVPixelBufferLockBaseAddress(pixel_buffer, 0);
-  NSCAssert(err == kCVReturnSuccess, @"CVPixelBufferLockBaseAddress failed: %d", err);
-  OSType pixel_format = CVPixelBufferGetPixelFormatType(pixel_buffer);
-  size_t bytes_per_row = CVPixelBufferGetBytesPerRow(pixel_buffer);
-  uint8_t* pixel_ptr = static_cast<uint8_t*>(CVPixelBufferGetBaseAddress(pixel_buffer));
-  if (pixel_format == kCVPixelFormatType_32BGRA) {
-    // TODO: restore previous framebuffer? Move this to helper so we can
-    // use BindFramebuffer?
-    glViewport(0, 0, width_, height_);
-    glFramebufferTexture2D(
-        GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, target_, name_, 0);
-
-    size_t contiguous_bytes_per_row = width_ * 4;
-    if (bytes_per_row == contiguous_bytes_per_row) {
-      glReadPixels(0, 0, width_, height_, GL_BGRA, GL_UNSIGNED_BYTE, pixel_ptr);
-    } else {
-      std::vector<uint8_t> contiguous_buffer(contiguous_bytes_per_row * height_);
-      uint8_t* temp_ptr = contiguous_buffer.data();
-      glReadPixels(0, 0, width_, height_, GL_BGRA, GL_UNSIGNED_BYTE, temp_ptr);
-      for (int i = 0; i < height_; ++i) {
-        memcpy(pixel_ptr, temp_ptr, contiguous_bytes_per_row);
-        temp_ptr += contiguous_bytes_per_row;
-        pixel_ptr += bytes_per_row;
-      }
-    }
-  } else {
-    uint32_t format_big = CFSwapInt32HostToBig(pixel_format);
-    NSLog(@"unsupported pixel format: %.4s", (char*)&format_big);
-  }
-  err = CVPixelBufferUnlockBaseAddress(pixel_buffer, 0);
-  NSCAssert(err == kCVReturnSuccess, @"CVPixelBufferUnlockBaseAddress failed: %d", err);
-#endif
-  return absl::make_unique<GpuBuffer>(gpu_buffer_);
-}
-
-void GlTexture::Release() {
-#if MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
-  if (*cv_texture_) {
-    cv_texture_.reset(NULL);
-  } else if (name_) {
-    // This is only needed because of the glGenTextures in
-    // CreateSourceTexture(ImageFrame)... change.
-    glDeleteTextures(1, &name_);
-  }
-#endif  // MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
-  helper_impl_ = nullptr;
-  gpu_buffer_ = nullptr;
-  plane_ = 0;
-  name_ = 0;
-  width_ = 0;
-  height_ = 0;
-}
-
-}  // namespace mediapipe

mediapipe/gpu/gl_context.cc

@@ -222,6 +222,9 @@ bool GlContext::HasGlExtension(absl::string_view extension) const {
 // to work with GL_EXTENSIONS for newer GL versions, so we must maintain both
 // variations of this function.
 absl::Status GlContext::GetGlExtensions() {
+  // RET_CHECK logs by default, but here we just want to check the precondition;
+  // we'll fall back to the alternative implementation for older versions.
+  RET_CHECK(gl_major_version_ >= 3).SetNoLogging();
   gl_extensions_.clear();
   // glGetStringi only introduced in GL 3.0+; so we exit out this function if
   // we don't have that function defined, regardless of version number reported.
@@ -330,13 +333,24 @@ absl::Status GlContext::FinishInitialization(bool create_thread) {
 
     LOG(INFO) << "GL version: " << gl_major_version_ << "." << gl_minor_version_
               << " (" << glGetString(GL_VERSION) << ")";
-    if (gl_major_version_ >= 3) {
+    {
       auto status = GetGlExtensions();
-      if (status.ok()) {
+      if (!status.ok()) {
+        status = GetGlExtensionsCompat();
+      }
+      MP_RETURN_IF_ERROR(status);
+    }
+
+#if GL_ES_VERSION_2_0  // This actually means "is GLES available".
+    // No linear float filtering by default, check extensions.
+    can_linear_filter_float_textures_ =
+        HasGlExtension("OES_texture_float_linear");
+#else
+    // Desktop GL should always allow linear filtering.
+    can_linear_filter_float_textures_ = true;
+#endif  // GL_ES_VERSION_2_0
+
     return absl::OkStatus();
-      }
-    }
-    return GetGlExtensionsCompat();
   });
 }
 
@@ -841,4 +855,25 @@ const GlTextureInfo& GlTextureInfoForGpuBufferFormat(GpuBufferFormat format,
   return GlTextureInfoForGpuBufferFormat(format, plane, ctx->GetGlVersion());
 }
 
+void GlContext::SetStandardTextureParams(GLenum target, GLint internal_format) {
+  // Default to using linear filter everywhere. For float32 textures, fall back
+  // to GL_NEAREST if linear filtering unsupported.
+  GLint filter;
+  switch (internal_format) {
+    case GL_R32F:
+    case GL_RG32F:
+    case GL_RGBA32F:
+      // 32F (unlike 16f) textures do not always support texture filtering
+      // (According to OpenGL ES specification [TEXTURE IMAGE SPECIFICATION])
+      filter = can_linear_filter_float_textures_ ? GL_LINEAR : GL_NEAREST;
+      break;
+    default:
+      filter = GL_LINEAR;
+  }
+  glTexParameteri(target, GL_TEXTURE_MIN_FILTER, filter);
+  glTexParameteri(target, GL_TEXTURE_MAG_FILTER, filter);
+  glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+}
+
 }  // namespace mediapipe

mediapipe/gpu/gl_context.h

@@ -276,6 +276,9 @@ class GlContext : public std::enable_shared_from_this<GlContext> {
     }).IgnoreError();
   }
 
+  // Sets default texture filtering parameters.
+  void SetStandardTextureParams(GLenum target, GLint internal_format);
+
   // These are used for testing specific SyncToken implementations. Do not use
   // outside of tests.
   enum class SyncTokenTypeForTest {
@@ -342,11 +345,11 @@ class GlContext : public std::enable_shared_from_this<GlContext> {
   // This wraps a thread_local.
   static std::weak_ptr<GlContext>& CurrentContext();
 
-  static absl::Status SwitchContext(ContextBinding* old_context,
+  static absl::Status SwitchContext(ContextBinding* saved_context,
                                     const ContextBinding& new_context);
 
-  absl::Status EnterContext(ContextBinding* previous_context);
-  absl::Status ExitContext(const ContextBinding* previous_context);
+  absl::Status EnterContext(ContextBinding* saved_context);
+  absl::Status ExitContext(const ContextBinding* saved_context);
   void DestroyContext();
 
   bool HasContext() const;
@@ -383,7 +386,7 @@ class GlContext : public std::enable_shared_from_this<GlContext> {
   static void GetCurrentContextBinding(ContextBinding* binding);
   // Makes the context described by new_context current on this thread.
   static absl::Status SetCurrentContextBinding(
-      const ContextBinding& new_context);
+      const ContextBinding& new_binding);
 
   // If not null, a dedicated thread used to execute tasks on this context.
   // Used on Android due to expensive context switching on some configurations.
@@ -396,6 +399,10 @@ class GlContext : public std::enable_shared_from_this<GlContext> {
   // so we should be fine storing the extension pieces as string_view's.
   std::set<absl::string_view> gl_extensions_;
 
+  // Used by SetStandardTextureParams. Do we want several of these bools, or a
+  // better mechanism?
+  bool can_linear_filter_float_textures_;
+
   // Number of glFinish calls completed on the GL thread.
   // Changes should be guarded by mutex_. However, we use simple atomic
   // loads for efficiency on the fast path.

mediapipe/gpu/gl_context_egl.cc

@@ -85,7 +85,7 @@ GlContext::StatusOrGlContext GlContext::Create(EGLContext share_context,
   return std::move(context);
 }
 
-absl::Status GlContext::CreateContextInternal(EGLContext external_context,
+absl::Status GlContext::CreateContextInternal(EGLContext share_context,
                                               int gl_version) {
   CHECK(gl_version == 2 || gl_version == 3);
 
@@ -131,8 +131,7 @@ absl::Status GlContext::CreateContextInternal(EGLContext external_context,
       // clang-format on
   };
 
-  context_ =
-      eglCreateContext(display_, config_, external_context, context_attr);
+  context_ = eglCreateContext(display_, config_, share_context, context_attr);
   int error = eglGetError();
   RET_CHECK(context_ != EGL_NO_CONTEXT)
       << "Could not create GLES " << gl_version << " context; "
@@ -149,7 +148,7 @@ absl::Status GlContext::CreateContextInternal(EGLContext external_context,
   return absl::OkStatus();
 }
 
-absl::Status GlContext::CreateContext(EGLContext external_context) {
+absl::Status GlContext::CreateContext(EGLContext share_context) {
   EGLint major = 0;
   EGLint minor = 0;
 
@@ -163,11 +162,11 @@ absl::Status GlContext::CreateContext(EGLContext external_context) {
   LOG(INFO) << "Successfully initialized EGL. Major : " << major
             << " Minor: " << minor;
 
-  auto status = CreateContextInternal(external_context, 3);
+  auto status = CreateContextInternal(share_context, 3);
   if (!status.ok()) {
     LOG(WARNING) << "Creating a context with OpenGL ES 3 failed: " << status;
     LOG(WARNING) << "Fall back on OpenGL ES 2.";
-    status = CreateContextInternal(external_context, 2);
+    status = CreateContextInternal(share_context, 2);
   }
   MP_RETURN_IF_ERROR(status);
 

mediapipe/gpu/gl_context_internal.h

@@ -36,7 +36,7 @@ class GlContext::DedicatedThread {
   DedicatedThread& operator=(DedicatedThread) = delete;
 
   absl::Status Run(GlStatusFunction gl_func);
-  void RunWithoutWaiting(GlVoidFunction gl_fund);
+  void RunWithoutWaiting(GlVoidFunction gl_func);
 
   bool IsCurrentThread();
 

mediapipe/gpu/gl_ios_test.mm

@@ -175,18 +175,16 @@
   mediapipe::GlCalculatorHelper helper;
   helper.InitializeForTest(&gpuData);
 
+  helper.RunInGlContext([&helper] {
     std::vector<std::pair<int, int>> sizes{
-    {200, 300},
-    {200, 299},
-    {196, 300},
-    {194, 300},
-    {193, 300},
+        {200, 300}, {200, 299}, {196, 300}, {194, 300}, {193, 300},
     };
     for (const auto& width_height : sizes) {
       mediapipe::GlTexture texture =
           helper.CreateDestinationTexture(width_height.first, width_height.second);
       XCTAssertNotEqual(texture.name(), 0);
     }
+  });
 }
 
 - (void)testSimpleConversionFromFormat:(OSType)cvPixelFormat {

mediapipe/gpu/gpu_buffer.cc

@@ -0,0 +1,260 @@
+#include "mediapipe/gpu/gpu_buffer.h"
+
+#include "mediapipe/gpu/gl_context.h"
+
+#if MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
+#include "mediapipe/objc/util.h"
+#endif  // MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
+
+namespace mediapipe {
+
+void GlTextureView::Release() {
+  if (detach_) detach_(*this);
+  detach_ = nullptr;
+  gl_context_ = nullptr;
+  gpu_buffer_ = nullptr;
+  plane_ = 0;
+  name_ = 0;
+  width_ = 0;
+  height_ = 0;
+}
+
+#if MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
+#if TARGET_OS_OSX
+typedef CVOpenGLTextureRef CVTextureType;
+#else
+typedef CVOpenGLESTextureRef CVTextureType;
+#endif  // TARGET_OS_OSX
+
+GlTextureView GpuBuffer::GetGlTextureView(int plane, bool for_reading) const {
+  CVReturn err;
+  auto gl_context = GlContext::GetCurrent();
+  CHECK(gl_context);
+#if TARGET_OS_OSX
+  CVTextureType cv_texture_temp;
+  err = CVOpenGLTextureCacheCreateTextureFromImage(
+      kCFAllocatorDefault, gl_context->cv_texture_cache(),
+      GetCVPixelBufferRef(), NULL, &cv_texture_temp);
+  CHECK(cv_texture_temp && !err)
+      << "CVOpenGLTextureCacheCreateTextureFromImage failed: " << err;
+  CFHolder<CVTextureType> cv_texture;
+  cv_texture.adopt(cv_texture_temp);
+  return GlTextureView(
+      gl_context.get(), CVOpenGLTextureGetTarget(*cv_texture),
+      CVOpenGLTextureGetName(*cv_texture), width(), height(), *this, plane,
+      [cv_texture](
+          mediapipe::GlTextureView&) { /* only retains cv_texture */ });
+#else
+  const GlTextureInfo info = GlTextureInfoForGpuBufferFormat(
+      format(), plane, gl_context->GetGlVersion());
+  CVTextureType cv_texture_temp;
+  err = CVOpenGLESTextureCacheCreateTextureFromImage(
+      kCFAllocatorDefault, gl_context->cv_texture_cache(),
+      GetCVPixelBufferRef(), NULL, GL_TEXTURE_2D, info.gl_internal_format,
+      width() / info.downscale, height() / info.downscale, info.gl_format,
+      info.gl_type, plane, &cv_texture_temp);
+  CHECK(cv_texture_temp && !err)
+      << "CVOpenGLESTextureCacheCreateTextureFromImage failed: " << err;
+  CFHolder<CVTextureType> cv_texture;
+  cv_texture.adopt(cv_texture_temp);
+  return GlTextureView(
+      gl_context.get(), CVOpenGLESTextureGetTarget(*cv_texture),
+      CVOpenGLESTextureGetName(*cv_texture), width(), height(), *this, plane,
+      [cv_texture](
+          mediapipe::GlTextureView&) { /* only retains cv_texture */ });
+#endif  // TARGET_OS_OSX
+}
+
+GpuBuffer GpuBuffer::CopyingImageFrame(const ImageFrame& image_frame) {
+  auto maybe_buffer = CreateCVPixelBufferCopyingImageFrame(image_frame);
+  // Converts absl::StatusOr to absl::Status since CHECK_OK() currently only
+  // deals with absl::Status in MediaPipe OSS.
+  CHECK_OK(maybe_buffer.status());
+  return GpuBuffer(std::move(maybe_buffer).value());
+}
+
+std::unique_ptr<ImageFrame> GpuBuffer::AsImageFrame() const {
+  CHECK(GetCVPixelBufferRef());
+  return CreateImageFrameForCVPixelBuffer(GetCVPixelBufferRef());
+}
+
+void GlTextureView::DoneWriting() const {
+  CHECK(gpu_buffer_);
+#if TARGET_IPHONE_SIMULATOR
+  CVPixelBufferRef pixel_buffer = gpu_buffer_.GetCVPixelBufferRef();
+  CVReturn err = CVPixelBufferLockBaseAddress(pixel_buffer, 0);
+  CHECK(err == kCVReturnSuccess)
+      << "CVPixelBufferLockBaseAddress failed: " << err;
+  OSType pixel_format = CVPixelBufferGetPixelFormatType(pixel_buffer);
+  size_t bytes_per_row = CVPixelBufferGetBytesPerRow(pixel_buffer);
+  uint8_t* pixel_ptr =
+      static_cast<uint8_t*>(CVPixelBufferGetBaseAddress(pixel_buffer));
+  if (pixel_format == kCVPixelFormatType_32BGRA) {
+    // TODO: restore previous framebuffer? Move this to helper so we
+    // can use BindFramebuffer?
+    glViewport(0, 0, width(), height());
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, target(),
+                           name(), 0);
+
+    size_t contiguous_bytes_per_row = width() * 4;
+    if (bytes_per_row == contiguous_bytes_per_row) {
+      glReadPixels(0, 0, width(), height(), GL_BGRA, GL_UNSIGNED_BYTE,
+                   pixel_ptr);
+    } else {
+      std::vector<uint8_t> contiguous_buffer(contiguous_bytes_per_row *
+                                             height());
+      uint8_t* temp_ptr = contiguous_buffer.data();
+      glReadPixels(0, 0, width(), height(), GL_BGRA, GL_UNSIGNED_BYTE,
+                   temp_ptr);
+      for (int i = 0; i < height(); ++i) {
+        memcpy(pixel_ptr, temp_ptr, contiguous_bytes_per_row);
+        temp_ptr += contiguous_bytes_per_row;
+        pixel_ptr += bytes_per_row;
+      }
+    }
+  } else {
+    LOG(ERROR) << "unsupported pixel format: " << pixel_format;
+  }
+  err = CVPixelBufferUnlockBaseAddress(pixel_buffer, 0);
+  CHECK(err == kCVReturnSuccess)
+      << "CVPixelBufferUnlockBaseAddress failed: " << err;
+#endif
+}
+#endif  // MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
+
+#if !MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
+GlTextureView GpuBuffer::GetGlTextureView(int plane, bool for_reading) const {
+  auto gl_context = GlContext::GetCurrent();
+  CHECK(gl_context);
+  const GlTextureBufferSharedPtr& texture_buffer =
+      GetGlTextureBufferSharedPtr();
+  // Insert wait call to sync with the producer.
+  texture_buffer->WaitOnGpu();
+  CHECK_EQ(plane, 0);
+  GlTextureView::DetachFn detach;
+  if (for_reading) {
+    detach = [](mediapipe::GlTextureView& texture) {
+      // Inform the GlTextureBuffer that we have finished accessing its
+      // contents, and create a consumer sync point.
+      texture.gpu_buffer().GetGlTextureBufferSharedPtr()->DidRead(
+          texture.gl_context()->CreateSyncToken());
+    };
+  }
+  return GlTextureView(gl_context.get(), texture_buffer->target(),
+                       texture_buffer->name(), width(), height(), *this, plane,
+                       std::move(detach));
+}
+
+GpuBuffer GpuBuffer::CopyingImageFrame(const ImageFrame& image_frame) {
+  auto gl_context = GlContext::GetCurrent();
+  CHECK(gl_context);
+
+  auto buffer = GlTextureBuffer::Create(image_frame);
+
+  // TODO: does this need to set the texture params? We set them again when the
+  // texture is actually acccessed via GlTexture[View]. Or should they always be
+  // set on creation?
+  if (buffer->format() != GpuBufferFormat::kUnknown) {
+    glBindTexture(GL_TEXTURE_2D, buffer->name());
+    GlTextureInfo info = GlTextureInfoForGpuBufferFormat(
+        buffer->format(), /*plane=*/0, gl_context->GetGlVersion());
+    gl_context->SetStandardTextureParams(buffer->target(),
+                                         info.gl_internal_format);
+    glBindTexture(GL_TEXTURE_2D, 0);
+  }
+
+  return GpuBuffer(std::move(buffer));
+}
+
+static void ReadTexture(const GlTextureView& view, void* output, size_t size) {
+  // TODO: check buffer size? We could use glReadnPixels where available
+  // (OpenGL ES 3.2, i.e. nowhere). Note that, to fully check that the read
+  // won't overflow the buffer with glReadPixels, we'd also need to check or
+  // reset several glPixelStore parameters (e.g. what if someone had the
+  // ill-advised idea of setting GL_PACK_SKIP_PIXELS?).
+  CHECK(view.gl_context());
+  GlTextureInfo info =
+      GlTextureInfoForGpuBufferFormat(view.gpu_buffer().format(), view.plane(),
+                                      view.gl_context()->GetGlVersion());
+
+  GLint current_fbo;
+  glGetIntegerv(GL_FRAMEBUFFER_BINDING, &current_fbo);
+  CHECK_NE(current_fbo, 0);
+
+  GLint color_attachment_name;
+  glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+                                        GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
+                                        &color_attachment_name);
+  if (color_attachment_name != view.name()) {
+    // Save the viewport. Note that we assume that the color attachment is a
+    // GL_TEXTURE_2D texture.
+    GLint viewport[4];
+    glGetIntegerv(GL_VIEWPORT, viewport);
+
+    // Set the data from GLTextureView object.
+    glViewport(0, 0, view.width(), view.height());
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, view.target(),
+                           view.name(), 0);
+    glReadPixels(0, 0, view.width(), view.height(), info.gl_format,
+                 info.gl_type, output);
+
+    // Restore from the saved viewport and color attachment name.
+    glViewport(viewport[0], viewport[1], viewport[2], viewport[3]);
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
+                           color_attachment_name, 0);
+  } else {
+    glReadPixels(0, 0, view.width(), view.height(), info.gl_format,
+                 info.gl_type, output);
+  }
+}
+
+std::unique_ptr<ImageFrame> GpuBuffer::AsImageFrame() const {
+  ImageFormat::Format image_format = ImageFormatForGpuBufferFormat(format());
+  auto output = absl::make_unique<ImageFrame>(
+      image_format, width(), height(), ImageFrame::kGlDefaultAlignmentBoundary);
+  auto view = GetGlTextureView(0, true);
+  ReadTexture(view, output->MutablePixelData(), output->PixelDataSize());
+  return output;
+}
+
+void GlTextureView::DoneWriting() const {
+  CHECK(gpu_buffer_);
+  // Inform the GlTextureBuffer that we have produced new content, and create
+  // a producer sync point.
+  gpu_buffer_.GetGlTextureBufferSharedPtr()->Updated(
+      gl_context()->CreateSyncToken());
+
+#ifdef __ANDROID__
+  // On (some?) Android devices, the texture may need to be explicitly
+  // detached from the current framebuffer.
+  // TODO: is this necessary even with the unbind in BindFramebuffer?
+  // It is not clear if this affected other contexts too, but let's keep it
+  // while in doubt.
+  GLint type = GL_NONE;
+  glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+                                        GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
+                                        &type);
+  if (type == GL_TEXTURE) {
+    GLint color_attachment = 0;
+    glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+                                          GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME,
+                                          &color_attachment);
+    if (color_attachment == name()) {
+      glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    }
+  }
+
+  // Some Android drivers log a GL_INVALID_ENUM error after the first
+  // glGetFramebufferAttachmentParameteriv call if there is no bound object,
+  // even though it should be ok to ask for the type and get back GL_NONE.
+  // Let's just ignore any pending errors here.
+  GLenum error;
+  while ((error = glGetError()) != GL_NO_ERROR) {
+  }
+
+#endif  // __ANDROID__
+}
+
+#endif  // !MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
+
+}  // namespace mediapipe

mediapipe/gpu/gpu_buffer.h

@@ -17,6 +17,7 @@
 
 #include <utility>
 
+#include "mediapipe/framework/formats/image_frame.h"
 #include "mediapipe/gpu/gl_base.h"
 #include "mediapipe/gpu/gpu_buffer_format.h"
 
@@ -32,6 +33,9 @@
 
 namespace mediapipe {
 
+class GlContext;
+class GlTextureView;
+
 // This class wraps a platform-specific buffer of GPU data.
 // An instance of GpuBuffer acts as an opaque reference to the underlying
 // data object.
@@ -84,6 +88,19 @@ class GpuBuffer {
   // Allow assignment from nullptr.
   GpuBuffer& operator=(std::nullptr_t other);
 
+  // TODO: split into read and write, remove const from write.
+  GlTextureView GetGlTextureView(int plane, bool for_reading) const;
+
+  // Make a GpuBuffer copying the data from an ImageFrame.
+  static GpuBuffer CopyingImageFrame(const ImageFrame& image_frame);
+
+  // Make an ImageFrame, possibly sharing the same data. The data is shared if
+  // the GpuBuffer's storage supports memory sharing; otherwise, it is copied.
+  // In order to work correctly across platforms, callers should always treat
+  // the returned ImageFrame as if it shares memory with the GpuBuffer, i.e.
+  // treat it as immutable if the GpuBuffer must not be modified.
+  std::unique_ptr<ImageFrame> AsImageFrame() const;
+
  private:
 #if MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
   CFHolder<CVPixelBufferRef> pixel_buffer_;
@@ -92,6 +109,51 @@ class GpuBuffer {
 #endif  // MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
 };
 
+class GlTextureView {
+ public:
+  GlTextureView() {}
+  ~GlTextureView() { Release(); }
+  // TODO: make this class move-only.
+
+  GlContext* gl_context() const { return gl_context_; }
+  int width() const { return width_; }
+  int height() const { return height_; }
+  GLenum target() const { return target_; }
+  GLuint name() const { return name_; }
+  const GpuBuffer& gpu_buffer() const { return gpu_buffer_; }
+  int plane() const { return plane_; }
+
+ private:
+  friend class GpuBuffer;
+  using DetachFn = std::function<void(GlTextureView&)>;
+  GlTextureView(GlContext* context, GLenum target, GLuint name, int width,
+                int height, GpuBuffer gpu_buffer, int plane, DetachFn detach)
+      : gl_context_(context),
+        target_(target),
+        name_(name),
+        width_(width),
+        height_(height),
+        gpu_buffer_(std::move(gpu_buffer)),
+        plane_(plane),
+        detach_(std::move(detach)) {}
+
+  // TODO: remove this friend declaration.
+  friend class GlTexture;
+  void Release();
+  // TODO: make this non-const.
+  void DoneWriting() const;
+
+  GlContext* gl_context_ = nullptr;
+  GLenum target_ = GL_TEXTURE_2D;
+  GLuint name_ = 0;
+  // Note: when scale is not 1, we still give the nominal size of the image.
+  int width_ = 0;
+  int height_ = 0;
+  GpuBuffer gpu_buffer_;
+  int plane_ = 0;
+  DetachFn detach_;
+};
+
 #if MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
 
 inline int GpuBuffer::width() const {

mediapipe/gpu/gpu_buffer_multi_pool.cc

@@ -21,10 +21,11 @@
 #include "mediapipe/framework/port/logging.h"
 #include "mediapipe/gpu/gpu_shared_data_internal.h"
 
-#ifdef __APPLE__
+#if MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
 #include "CoreFoundation/CFBase.h"
 #include "mediapipe/objc/CFHolder.h"
-#endif  // __APPLE__
+#include "mediapipe/objc/util.h"
+#endif  // MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
 
 namespace mediapipe {
 

mediapipe/gpu/pixel_buffer_pool_util.h

@@ -63,11 +63,6 @@ CVReturn CreateCVPixelBufferWithPool(CVPixelBufferPoolRef pool,
 CFDictionaryRef CreateCVPixelBufferPoolAuxiliaryAttributesForThreshold(
     int allocationThreshold);
 
-// Create a CVPixelBuffer without using a pool.
-CVReturn CreateCVPixelBufferWithoutPool(int width, int height,
-                                        OSType pixelFormat,
-                                        CVPixelBufferRef* outBuffer);
-
 }  // namespace mediapipe
 
 #endif  // MEDIAPIPE_GPU_PIXEL_BUFFER_POOL_UTIL_H_

mediapipe/gpu/pixel_buffer_pool_util.mm

@@ -121,33 +121,4 @@ CVReturn CreateCVPixelBufferWithPool(
   return err;
 }
 
-#if TARGET_IPHONE_SIMULATOR
-static void FreeRefConReleaseCallback(void* refCon, const void* baseAddress) {
-  free(refCon);
-}
-#endif
-
-CVReturn CreateCVPixelBufferWithoutPool(
-    int width, int height, OSType pixelFormat, CVPixelBufferRef* outBuffer) {
-#if TARGET_IPHONE_SIMULATOR
-  // On the simulator, syncing the texture with the pixelbuffer does not work,
-  // and we have to use glReadPixels. Since GL_UNPACK_ROW_LENGTH is not
-  // available in OpenGL ES 2, we should create the buffer so the pixels are
-  // contiguous.
-  //
-  // TODO: verify if we can use kIOSurfaceBytesPerRow to force
-  // CoreVideo to give us contiguous data.
-  size_t bytes_per_row = width * 4;
-  void* data = malloc(bytes_per_row * height);
-  return CVPixelBufferCreateWithBytes(
-      kCFAllocatorDefault, width, height, pixelFormat, data, bytes_per_row,
-      FreeRefConReleaseCallback, data, GetCVPixelBufferAttributesForGlCompatibility(),
-      outBuffer);
-#else
-  return CVPixelBufferCreate(
-      kCFAllocatorDefault, width, height, pixelFormat,
-      GetCVPixelBufferAttributesForGlCompatibility(), outBuffer);
-#endif
-}
-
 }  // namespace mediapipe

mediapipe/graphs/face_mesh/calculators/face_landmarks_to_render_data_calculator.cc

@@ -28,7 +28,7 @@ namespace mediapipe {
 
 namespace {
 
-constexpr int kNumFaceLandmarkConnections = 124;
+constexpr int kNumFaceLandmarkConnections = 132;
 // Pairs of landmark indices to be rendered with connections.
 constexpr int kFaceLandmarkConnections[] = {
     // Lips.
@@ -43,6 +43,8 @@ constexpr int kFaceLandmarkConnections[] = {
     133,
     // Left eyebrow.
     46, 53, 53, 52, 52, 65, 65, 55, 70, 63, 63, 105, 105, 66, 66, 107,
+    // Left iris.
+    474, 475, 475, 476, 476, 477, 477, 474,
     // Right eye.
     263, 249, 249, 390, 390, 373, 373, 374, 374, 380, 380, 381, 381, 382, 382,
     362, 263, 466, 466, 388, 388, 387, 387, 386, 386, 385, 385, 384, 384, 398,
@@ -50,6 +52,8 @@ constexpr int kFaceLandmarkConnections[] = {
     // Right eyebrow.
     276, 283, 283, 282, 282, 295, 295, 285, 300, 293, 293, 334, 334, 296, 296,
     336,
+    // Right iris.
+    469, 470, 470, 471, 471, 472, 472, 469,
     // Face oval.
     10, 338, 338, 297, 297, 332, 332, 284, 284, 251, 251, 389, 389, 356, 356,
     454, 454, 323, 323, 361, 361, 288, 288, 397, 397, 365, 365, 379, 379, 378,

mediapipe/graphs/face_mesh/face_mesh_desktop.pbtxt

@@ -22,10 +22,12 @@ node {
 # Defines side packets for further use in the graph.
 node {
   calculator: "ConstantSidePacketCalculator"
-  output_side_packet: "PACKET:num_faces"
+  output_side_packet: "PACKET:0:num_faces"
+  output_side_packet: "PACKET:1:with_attention"
   node_options: {
     [type.googleapis.com/mediapipe.ConstantSidePacketCalculatorOptions]: {
       packet { int_value: 1 }
+      packet { bool_value: true }
     }
   }
 }
@@ -35,6 +37,7 @@ node {
   calculator: "FaceLandmarkFrontCpu"
   input_stream: "IMAGE:input_video"
   input_side_packet: "NUM_FACES:num_faces"
+  input_side_packet: "WITH_ATTENTION:with_attention"
   output_stream: "LANDMARKS:multi_face_landmarks"
   output_stream: "ROIS_FROM_LANDMARKS:face_rects_from_landmarks"
   output_stream: "DETECTIONS:face_detections"

mediapipe/graphs/face_mesh/face_mesh_desktop_live.pbtxt

@@ -33,10 +33,12 @@ node {
 # Defines side packets for further use in the graph.
 node {
   calculator: "ConstantSidePacketCalculator"
-  output_side_packet: "PACKET:num_faces"
+  output_side_packet: "PACKET:0:num_faces"
+  output_side_packet: "PACKET:1:with_attention"
   node_options: {
     [type.googleapis.com/mediapipe.ConstantSidePacketCalculatorOptions]: {
       packet { int_value: 1 }
+      packet { bool_value: true }
     }
   }
 }
@@ -46,6 +48,7 @@ node {
   calculator: "FaceLandmarkFrontCpu"
   input_stream: "IMAGE:throttled_input_video"
   input_side_packet: "NUM_FACES:num_faces"
+  input_side_packet: "WITH_ATTENTION:with_attention"
   output_stream: "LANDMARKS:multi_face_landmarks"
   output_stream: "ROIS_FROM_LANDMARKS:face_rects_from_landmarks"
   output_stream: "DETECTIONS:face_detections"

mediapipe/graphs/face_mesh/face_mesh_desktop_live_gpu.pbtxt

@@ -33,10 +33,12 @@ node {
 # Defines side packets for further use in the graph.
 node {
   calculator: "ConstantSidePacketCalculator"
-  output_side_packet: "PACKET:num_faces"
+  output_side_packet: "PACKET:0:num_faces"
+  output_side_packet: "PACKET:1:with_attention"
   node_options: {
     [type.googleapis.com/mediapipe.ConstantSidePacketCalculatorOptions]: {
       packet { int_value: 1 }
+      packet { bool_value: true }
     }
   }
 }
@@ -46,6 +48,7 @@ node {
   calculator: "FaceLandmarkFrontGpu"
   input_stream: "IMAGE:throttled_input_video"
   input_side_packet: "NUM_FACES:num_faces"
+  input_side_packet: "WITH_ATTENTION:with_attention"
   output_stream: "LANDMARKS:multi_face_landmarks"
   output_stream: "ROIS_FROM_LANDMARKS:face_rects_from_landmarks"
   output_stream: "DETECTIONS:face_detections"

mediapipe/graphs/face_mesh/face_mesh_mobile.pbtxt

@@ -33,11 +33,23 @@ node {
   output_stream: "throttled_input_video"
 }
 
+# Defines side packets for further use in the graph.
+node {
+  calculator: "ConstantSidePacketCalculator"
+  output_side_packet: "PACKET:with_attention"
+  node_options: {
+    [type.googleapis.com/mediapipe.ConstantSidePacketCalculatorOptions]: {
+      packet { bool_value: true }
+    }
+  }
+}
+
 # Subgraph that detects faces and corresponding landmarks.
 node {
   calculator: "FaceLandmarkFrontGpu"
   input_stream: "IMAGE:throttled_input_video"
   input_side_packet: "NUM_FACES:num_faces"
+  input_side_packet: "WITH_ATTENTION:with_attention"
   output_stream: "LANDMARKS:multi_face_landmarks"
   output_stream: "ROIS_FROM_LANDMARKS:face_rects_from_landmarks"
   output_stream: "DETECTIONS:face_detections"

mediapipe/java/com/google/mediapipe/components/ExternalTextureConverter.java

@@ -511,7 +511,7 @@ public class ExternalTextureConverter implements TextureFrameProducer {
                   frame.getHeight(),
                   frame.getTimestamp()));
         }
-        frame.waitUntilReleased();
+        frame.waitUntilReleasedWithGpuSync();
         if (Log.isLoggable(TAG, Log.VERBOSE)) {
           Log.v(
               TAG,

mediapipe/java/com/google/mediapipe/framework/AppTextureFrame.java

@@ -66,7 +66,9 @@ public class AppTextureFrame implements TextureFrame {
 
   /**
    * Waits until the consumer is done with the texture.
-   * @throws InterruptedException
+   *
+   * <p>This does a CPU wait for the texture to be complete.
+   * Use {@link waitUntilReleasedWithGpuSync} whenever possible.
    */
   public void waitUntilReleased() throws InterruptedException {
     synchronized (this) {
@@ -82,6 +84,26 @@ public class AppTextureFrame implements TextureFrame {
     }
   }
 
+  /**
+   * Waits until the consumer is done with the texture.
+   *
+   * <p>This method must be called within the application's GL context that will overwrite the
+   * TextureFrame.
+   */
+  public void waitUntilReleasedWithGpuSync() throws InterruptedException {
+    synchronized (this) {
+      while (inUse && releaseSyncToken == null) {
+        wait();
+      }
+      if (releaseSyncToken != null) {
+        releaseSyncToken.waitOnGpu();
+        releaseSyncToken.release();
+        inUse = false;
+        releaseSyncToken = null;
+      }
+    }
+  }
+
   /**
    * Returns whether the texture is currently in use.
    *

mediapipe/java/com/google/mediapipe/framework/GraphTextureFrame.java

@@ -37,9 +37,18 @@ public class GraphTextureFrame implements TextureFrame {
     this.timestamp = timestamp;
   }
 
-  /** Returns the name of the underlying OpenGL texture. */
+  /**
+   * Returns the name of the underlying OpenGL texture.
+   *
+   * <p>Note: if this texture has been obtained using getTextureFrameDeferredWait, a GPU wait on the
+   * producer sync will be done here. That means this method should be called on the GL context that
+   * will actually use the texture.
+   */
   @Override
   public int getTextureName() {
+    // Note that, if a CPU wait has already been done, the sync point will have been
+    // cleared and this will turn into a no-op. See GlFenceSyncPoint::Wait.
+    nativeGpuWait(nativeBufferHandle);
     return textureName;
   }
 
@@ -92,4 +101,6 @@ public class GraphTextureFrame implements TextureFrame {
   private native int nativeGetTextureName(long nativeHandle);
   private native int nativeGetWidth(long nativeHandle);
   private native int nativeGetHeight(long nativeHandle);
+
+  private native void nativeGpuWait(long nativeHandle);
 }

mediapipe/java/com/google/mediapipe/framework/PacketGetter.java

@@ -288,7 +288,18 @@ public final class PacketGetter {
    */
   public static GraphTextureFrame getTextureFrame(final Packet packet) {
     return new GraphTextureFrame(
-        nativeGetGpuBuffer(packet.getNativeHandle()), packet.getTimestamp());
+        nativeGetGpuBuffer(packet.getNativeHandle(), /* waitOnCpu= */ true), packet.getTimestamp());
+  }
+
+  /**
+   * Works like {@link #getTextureFrame(Packet)}, but does not insert a CPU wait for the texture's
+   * producer before returning. Instead, a GPU wait will automatically occur when
+   * GraphTextureFrame#getTextureName is called.
+   */
+  public static GraphTextureFrame getTextureFrameDeferredSync(final Packet packet) {
+    return new GraphTextureFrame(
+        nativeGetGpuBuffer(packet.getNativeHandle(), /* waitOnCpu= */ false),
+        packet.getTimestamp());
   }
 
   private static native long nativeGetPacketFromReference(long nativePacketHandle);
@@ -356,7 +367,7 @@ public final class PacketGetter {
 
   private static native int nativeGetGpuBufferName(long nativePacketHandle);
 
-  private static native long nativeGetGpuBuffer(long nativePacketHandle);
+  private static native long nativeGetGpuBuffer(long nativePacketHandle, boolean waitOnCpu);
 
   private PacketGetter() {}
 }

mediapipe/java/com/google/mediapipe/framework/jni/BUILD

@@ -123,6 +123,7 @@ cc_library(
             "//mediapipe/gpu:gpu_buffer",
             "//mediapipe/gpu:gpu_shared_data_internal",
             "//mediapipe/gpu:graph_support",
+            "//mediapipe/gpu:egl_surface_holder",
         ],
         "//mediapipe/gpu:disable_gpu": [
             "//mediapipe/gpu:gpu_shared_data_internal",

mediapipe/java/com/google/mediapipe/framework/jni/graph_texture_frame_jni.cc

@@ -34,6 +34,13 @@ JNIEXPORT jint JNICALL GRAPH_TEXTURE_FRAME_METHOD(nativeGetTextureName)(
   return (*buffer)->name();
 }
 
+JNIEXPORT void JNICALL GRAPH_TEXTURE_FRAME_METHOD(nativeGpuWait)(
+    JNIEnv* env, jobject thiz, jlong nativeHandle) {
+  GlTextureBufferSharedPtr* buffer =
+      reinterpret_cast<GlTextureBufferSharedPtr*>(nativeHandle);
+  (*buffer)->WaitOnGpu();
+}
+
 JNIEXPORT jint JNICALL GRAPH_TEXTURE_FRAME_METHOD(nativeGetWidth)(
     JNIEnv* env, jobject thiz, jlong nativeHandle) {
   GlTextureBufferSharedPtr* buffer =

mediapipe/java/com/google/mediapipe/framework/jni/graph_texture_frame_jni.h

@@ -31,6 +31,9 @@ JNIEXPORT void JNICALL GRAPH_TEXTURE_FRAME_METHOD(nativeReleaseBuffer)(
 JNIEXPORT jint JNICALL GRAPH_TEXTURE_FRAME_METHOD(nativeGetTextureName)(
     JNIEnv* env, jobject thiz, jlong nativeHandle);
 
+JNIEXPORT void JNICALL GRAPH_TEXTURE_FRAME_METHOD(nativeGpuWait)(
+    JNIEnv* env, jobject thiz, jlong nativeHandle);
+
 JNIEXPORT jint JNICALL GRAPH_TEXTURE_FRAME_METHOD(nativeGetWidth)(
     JNIEnv* env, jobject thiz, jlong nativeHandle);
 

mediapipe/java/com/google/mediapipe/framework/jni/packet_getter_jni.cc

@@ -437,9 +437,8 @@ JNIEXPORT jint JNICALL PACKET_GETTER_METHOD(nativeGetGpuBufferName)(
   return static_cast<jint>(gpu_buffer.GetGlTextureBufferSharedPtr()->name());
 }
 
-JNIEXPORT jlong JNICALL PACKET_GETTER_METHOD(nativeGetGpuBuffer)(JNIEnv* env,
-                                                                 jobject thiz,
-                                                                 jlong packet) {
+JNIEXPORT jlong JNICALL PACKET_GETTER_METHOD(nativeGetGpuBuffer)(
+    JNIEnv* env, jobject thiz, jlong packet, jboolean wait_on_cpu) {
   mediapipe::Packet mediapipe_packet =
       mediapipe::android::Graph::GetPacketFromHandle(packet);
   mediapipe::GlTextureBufferSharedPtr ptr;
@@ -459,7 +458,9 @@ JNIEXPORT jlong JNICALL PACKET_GETTER_METHOD(nativeGetGpuBuffer)(JNIEnv* env,
         mediapipe_packet.Get<mediapipe::GpuBuffer>();
     ptr = buffer.GetGlTextureBufferSharedPtr();
   }
+  if (wait_on_cpu) {
     ptr->WaitUntilComplete();
+  }
   return reinterpret_cast<intptr_t>(
       new mediapipe::GlTextureBufferSharedPtr(ptr));
 }

mediapipe/java/com/google/mediapipe/framework/jni/packet_getter_jni.h

@@ -154,9 +154,8 @@ JNIEXPORT jint JNICALL PACKET_GETTER_METHOD(nativeGetGpuBufferName)(
 
 // Returns a mediapipe::GlTextureBufferSharedPtr*.
 // This will survive independently of the packet.
-JNIEXPORT jlong JNICALL PACKET_GETTER_METHOD(nativeGetGpuBuffer)(JNIEnv* env,
-                                                                 jobject thiz,
-                                                                 jlong packet);
+JNIEXPORT jlong JNICALL PACKET_GETTER_METHOD(nativeGetGpuBuffer)(
+    JNIEnv* env, jobject thiz, jlong packet, jboolean wait_on_cpu);
 
 #ifdef __cplusplus
 }  // extern "C"

mediapipe/java/com/google/mediapipe/solutioncore/BUILD

@@ -22,7 +22,6 @@ android_library(
         ["*.java"],
         exclude = [
             "CameraInput.java",
-            "ResultGlBoundary.java",
             "ResultGlRenderer.java",
             "SolutionGlSurfaceView.java",
             "SolutionGlSurfaceViewRenderer.java",
@@ -67,7 +66,6 @@ android_library(
 android_library(
     name = "solution_rendering",
     srcs = [
-        "ResultGlBoundary.java",
         "ResultGlRenderer.java",
         "SolutionGlSurfaceView.java",
         "SolutionGlSurfaceViewRenderer.java",
@@ -78,7 +76,6 @@ android_library(
         "//mediapipe/java/com/google/mediapipe/components:android_components",
         "//mediapipe/java/com/google/mediapipe/framework:android_framework",
         "//mediapipe/java/com/google/mediapipe/glutil",
-        "//third_party:autovalue",
         "@maven//:com_google_guava_guava",
     ],
 )
@@ -91,6 +88,8 @@ cc_binary(
     # TODO: Add more calculators to support other top-level solutions.
     deps = [
         "//mediapipe/java/com/google/mediapipe/framework/jni:mediapipe_framework_jni",
+        "//mediapipe/modules/face_detection:face_detection_full_range_image",
+        "//mediapipe/modules/face_detection:face_detection_short_range_image",
         "//mediapipe/modules/face_landmark:face_landmark_front_cpu_image",
         "//mediapipe/modules/face_landmark:face_landmark_front_gpu_image",
         "//mediapipe/modules/hand_landmark:hand_landmark_tracking_cpu_image",

mediapipe/java/com/google/mediapipe/solutioncore/ImageSolutionBase.java

@@ -54,7 +54,7 @@ public class ImageSolutionBase extends SolutionBase {
       eglManager = new EglManager(/*parentContext=*/ null);
       solutionGraph.setParentGlContext(eglManager.getNativeContext());
     } catch (MediaPipeException e) {
-      throwException("Error occurs when creating MediaPipe image solution graph. ", e);
+      reportError("Error occurs while creating MediaPipe image solution graph.", e);
     }
   }
 
@@ -72,8 +72,8 @@ public class ImageSolutionBase extends SolutionBase {
   /** Sends a {@link TextureFrame} into solution graph for processing. */
   public void send(TextureFrame textureFrame) {
     if (!staticImageMode && textureFrame.getTimestamp() == Long.MIN_VALUE) {
-      throwException(
-          "Error occurs when calling the solution send method. ",
+      reportError(
+          "Error occurs while calling the MediaPipe solution send method.",
           new MediaPipeException(
               MediaPipeException.StatusCode.FAILED_PRECONDITION.ordinal(),
               "TextureFrame's timestamp needs to be explicitly set if not in static image mode."));
@@ -98,8 +98,8 @@ public class ImageSolutionBase extends SolutionBase {
   /** Sends a {@link Bitmap} (static image) into solution graph for processing. */
   public void send(Bitmap inputBitmap) {
     if (!staticImageMode) {
-      throwException(
-          "Error occurs when calling the solution send method. ",
+      reportError(
+          "Error occurs while calling the solution send method.",
           new MediaPipeException(
               MediaPipeException.StatusCode.FAILED_PRECONDITION.ordinal(),
               "When not in static image mode, a timestamp associated with the image is required."
@@ -112,7 +112,7 @@ public class ImageSolutionBase extends SolutionBase {
   /** Internal implementation of sending Bitmap/TextureFrame into the MediaPipe solution. */
   private synchronized <T> void sendImage(T imageObj, long timestamp) {
     if (lastTimestamp >= timestamp) {
-      throwException(
+      reportError(
           "The received frame having a smaller timestamp than the processed timestamp.",
           new MediaPipeException(
               MediaPipeException.StatusCode.FAILED_PRECONDITION.ordinal(),
@@ -123,7 +123,7 @@ public class ImageSolutionBase extends SolutionBase {
       if (imageObj instanceof TextureFrame) {
         ((TextureFrame) imageObj).release();
       }
-      throwException(
+      reportError(
           "The solution graph hasn't been successfully started or error occurs during graph"
               + " initializaton.",
           new MediaPipeException(
@@ -140,7 +140,7 @@ public class ImageSolutionBase extends SolutionBase {
       } else if (imageObj instanceof Bitmap) {
         imagePacket = packetCreator.createRgbaImage((Bitmap) imageObj);
       } else {
-        throwException(
+        reportError(
             "The input image type is not supported.",
             new MediaPipeException(
                 MediaPipeException.StatusCode.UNIMPLEMENTED.ordinal(),
@@ -164,7 +164,7 @@ public class ImageSolutionBase extends SolutionBase {
       }
     } catch (RuntimeException e) {
       if (errorListener != null) {
-        errorListener.onError("Mediapipe error: ", e);
+        errorListener.onError("MediaPipe packet creation error: " + e.getMessage(), e);
       } else {
         throw e;
       }

mediapipe/java/com/google/mediapipe/solutioncore/OutputHandler.java

@@ -33,6 +33,8 @@ public class OutputHandler<T extends SolutionResult> {
   private ResultListener<T> customResultListener;
   // The user-defined error listener.
   private ErrorListener customErrorListener;
+  // Whether the output handler should react to timestamp-bound changes by outputting empty packets.
+  private boolean handleTimestampBoundChanges = false;
 
   /**
    * Sets a callback to be invoked to convert a packet list to a solution result object.
@@ -61,6 +63,20 @@ public class OutputHandler<T extends SolutionResult> {
     this.customErrorListener = listener;
   }
 
+  /**
+   * Sets whether the output handler should react to timestamp-bound changes by outputting empty
+   * packets.
+   *
+   * @param handleTimestampBoundChanges a boolean value.
+   */
+  public void setHandleTimestampBoundChanges(boolean handleTimestampBoundChanges) {
+    this.handleTimestampBoundChanges = handleTimestampBoundChanges;
+  }
+
+  public boolean handleTimestampBoundChanges() {
+    return handleTimestampBoundChanges;
+  }
+
   /** Handles a list of output packets. Invoked when packet lists become available. */
   public void run(List<Packet> packets) {
     T solutionResult = null;

mediapipe/java/com/google/mediapipe/solutioncore/ResultGlBoundary.java

@@ -1,37 +0,0 @@
-// Copyright 2021 The MediaPipe Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.google.mediapipe.solutioncore;
-
-import com.google.auto.value.AutoValue;
-
-/**
- * The left, right, bottom, and top boundaries of the visible section on the screen. The boundary
- * values are typically within the range -1.0 and 1.0.
- */
-@AutoValue
-public abstract class ResultGlBoundary {
-
-  static ResultGlBoundary create(float left, float right, float bottom, float top) {
-    return new AutoValue_ResultGlBoundary(left, right, bottom, top);
-  }
-
-  public abstract float left();
-
-  public abstract float right();
-
-  public abstract float bottom();
-
-  public abstract float top();
-}

mediapipe/java/com/google/mediapipe/solutioncore/ResultGlRenderer.java

@@ -20,6 +20,16 @@ public interface ResultGlRenderer<T extends ImageSolutionResult> {
   /** Sets up OpenGL rendering when the surface is created or recreated. */
   void setupRendering();
 
-  /** Renders the solution result. */
-  void renderResult(T result, ResultGlBoundary boundary);
+  /**
+   * Renders the solution result.
+   *
+   * @param result a solution result object that contains the solution outputs.
+   * @param projectionMatrix a 4 x 4 column-vector matrix stored in column-major order (see also <a
+   *     href="https://developer.android.com/reference/android/opengl/Matrix">android.opengl.Matrix</a>).
+   *     It is an orthographic projection matrix that maps x and y coordinates in {@code result},
+   *     defined in [0, 1]x[0, 1] spanning the entire input image (with a top-left origin), to fit
+   *     into the {@link SolutionGlSurfaceView} (with a bottom-left origin) that the input image is
+   *     rendered into with potential cropping.
+   */
+  void renderResult(T result, float[] projectionMatrix);
 }

mediapipe/java/com/google/mediapipe/solutioncore/SolutionBase.java

@@ -73,22 +73,25 @@ public class SolutionBase {
             AndroidAssetUtil.getAssetBytes(context.getAssets(), solutionInfo.binaryGraphPath()));
       }
       solutionGraph.addMultiStreamCallback(
-          solutionInfo.outputStreamNames(), outputHandler::run, /*observeTimestampBounds=*/ true);
+          solutionInfo.outputStreamNames(),
+          outputHandler::run,
+          /*observeTimestampBounds=*/ outputHandler.handleTimestampBoundChanges());
       packetCreator = new AndroidPacketCreator(solutionGraph);
     } catch (MediaPipeException e) {
-      throwException("Error occurs when creating the MediaPipe solution graph. ", e);
+      reportError("Error occurs while creating the MediaPipe solution graph.", e);
     }
   }
 
-  /** Throws exception with error message. */
-  protected void throwException(String message, MediaPipeException e) {
+  /** Reports error with the detailed error message. */
+  protected void reportError(String message, MediaPipeException e) {
+    String detailedErrorMessage = String.format("%s Error details: %s", message, e.getMessage());
     if (errorListener != null) {
-      errorListener.onError(message, e);
+      errorListener.onError(detailedErrorMessage, e);
     } else {
-      Log.e(TAG, message, e);
-    }
+      Log.e(TAG, detailedErrorMessage, e);
       throw e;
     }
+  }
 
   /**
    * A convinence method to get proto list from a packet. If packet is empty, returns an empty list.
@@ -114,7 +117,7 @@ public class SolutionBase {
         solutionGraph.startRunningGraph();
       }
     } catch (MediaPipeException e) {
-      throwException("Error occurs when starting the MediaPipe solution graph. ", e);
+      reportError("Error occurs while starting the MediaPipe solution graph.", e);
     }
   }
 
@@ -123,7 +126,7 @@ public class SolutionBase {
     try {
       solutionGraph.waitUntilGraphIdle();
     } catch (MediaPipeException e) {
-      throwException("Error occurs when waiting until the MediaPipe graph becomes idle. ", e);
+      reportError("Error occurs while waiting until the MediaPipe graph becomes idle.", e);
     }
   }
 
@@ -137,12 +140,12 @@ public class SolutionBase {
         // Note: errors during Process are reported at the earliest opportunity,
         // which may be addPacket or waitUntilDone, depending on timing. For consistency,
         // we want to always report them using the same async handler if installed.
-        throwException("Error occurs when closing the Mediapipe solution graph. ", e);
+        reportError("Error occurs while closing the Mediapipe solution graph.", e);
       }
       try {
         solutionGraph.tearDown();
       } catch (MediaPipeException e) {
-        throwException("Error occurs when closing the Mediapipe solution graph. ", e);
+        reportError("Error occurs while closing the Mediapipe solution graph.", e);
       }
     }
   }

mediapipe/java/com/google/mediapipe/solutioncore/SolutionGlSurfaceViewRenderer.java

@@ -16,6 +16,7 @@ package com.google.mediapipe.solutioncore;
 
 import android.graphics.SurfaceTexture;
 import android.opengl.GLES20;
+import android.opengl.Matrix;
 import com.google.mediapipe.components.GlSurfaceViewRenderer;
 import com.google.mediapipe.framework.TextureFrame;
 import com.google.mediapipe.glutil.ShaderUtil;
@@ -91,14 +92,18 @@ public class SolutionGlSurfaceViewRenderer<T extends ImageSolutionResult>
     if (nextSolutionResult != null) {
       solutionResult = nextSolutionResult.getAndSet(null);
       float[] textureBoundary = calculateTextureBoundary();
-      // Scales the values from [0, 1] to [-1, 1].
-      ResultGlBoundary resultGlBoundary =
-          ResultGlBoundary.create(
-              textureBoundary[0] * 2 - 1,
-              textureBoundary[1] * 2 - 1,
-              textureBoundary[2] * 2 - 1,
-              textureBoundary[3] * 2 - 1);
-      resultGlRenderer.renderResult(solutionResult, resultGlBoundary);
+      float[] projectionMatrix = new float[16];
+      // See {@link ResultGlRenderer#renderResult}.
+      Matrix.orthoM(
+          projectionMatrix, /* result */
+          0, /* offset */
+          textureBoundary[0], /* left */
+          textureBoundary[1], /* right */
+          textureBoundary[3], /* bottom */
+          textureBoundary[2], /* top */
+          -1, /* near */
+          1 /* far */);
+      resultGlRenderer.renderResult(solutionResult, projectionMatrix);
     }
     flush(frame);
     if (solutionResult != null) {

mediapipe/java/com/google/mediapipe/solutions/facedetection/AndroidManifest.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.google.mediapipe.solutions.facedetection">
+
+    <uses-sdk android:minSdkVersion="21"
+        android:targetSdkVersion="27" />
+
+</manifest>

mediapipe/java/com/google/mediapipe/solutions/facedetection/BUILD

@@ -0,0 +1,45 @@
+# Copyright 2021 The MediaPipe Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+licenses(["notice"])
+
+android_library(
+    name = "facedetection",
+    srcs = [
+        "FaceDetection.java",
+        "FaceDetectionOptions.java",
+        "FaceDetectionResult.java",
+        "FaceKeypoint.java",
+    ],
+    assets = [
+        "//mediapipe/modules/face_detection:face_detection_full_range_image.binarypb",
+        "//mediapipe/modules/face_detection:face_detection_full_range_sparse.tflite",
+        "//mediapipe/modules/face_detection:face_detection_short_range.tflite",
+        "//mediapipe/modules/face_detection:face_detection_short_range_image.binarypb",
+    ],
+    assets_dir = "",
+    javacopts = ["-Acom.google.auto.value.AutoBuilderIsUnstable"],
+    manifest = ":AndroidManifest.xml",
+    visibility = ["//visibility:public"],
+    deps = [
+        "//mediapipe/framework/formats:detection_java_proto_lite",
+        "//mediapipe/framework/formats:location_data_java_proto_lite",
+        "//mediapipe/java/com/google/mediapipe/framework:android_framework",
+        "//mediapipe/java/com/google/mediapipe/solutioncore:solution_base",
+        "//third_party:autovalue",
+        "@maven//:androidx_annotation_annotation",
+        "@maven//:com_google_code_findbugs_jsr305",
+        "@maven//:com_google_guava_guava",
+    ],
+)

mediapipe/java/com/google/mediapipe/solutions/facedetection/FaceDetection.java

@@ -0,0 +1,130 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.mediapipe.solutions.facedetection;
+
+import android.content.Context;
+import com.google.common.collect.ImmutableList;
+import com.google.mediapipe.formats.proto.DetectionProto.Detection;
+import com.google.mediapipe.formats.proto.LocationDataProto.LocationData.RelativeKeypoint;
+import com.google.mediapipe.framework.MediaPipeException;
+import com.google.mediapipe.framework.Packet;
+import com.google.mediapipe.solutioncore.ErrorListener;
+import com.google.mediapipe.solutioncore.ImageSolutionBase;
+import com.google.mediapipe.solutioncore.OutputHandler;
+import com.google.mediapipe.solutioncore.ResultListener;
+import com.google.mediapipe.solutioncore.SolutionInfo;
+import java.util.HashMap;
+import java.util.Map;
+import javax.annotation.Nullable;
+
+/**
+ * MediaPipe Face Detection Solution API.
+ *
+ * <p>MediaPipe Face Detection processes a {@link TextureFrame} or a {@link Bitmap} and returns the
+ * {@link FaceDetectionResult} representing each detected face. Please refer to
+ * https://solutions.mediapipe.dev/face_detection#android-solution-api for usage examples.
+ */
+public class FaceDetection extends ImageSolutionBase {
+  private static final String TAG = "FaceDetection";
+
+  private static final String SHORT_RANGE_GRAPH_NAME = "face_detection_short_range_image.binarypb";
+  private static final String FULL_RANGE_GRAPH_NAME = "face_detection_full_range_image.binarypb";
+  private static final String IMAGE_INPUT_STREAM = "image";
+  private static final ImmutableList<String> OUTPUT_STREAMS =
+      ImmutableList.of("detections", "throttled_image");
+  private static final int DETECTIONS_INDEX = 0;
+  private static final int INPUT_IMAGE_INDEX = 1;
+  private final OutputHandler<FaceDetectionResult> outputHandler;
+
+  /**
+   * Initializes MediaPipe Face Detection solution.
+   *
+   * @param context an Android {@link Context}.
+   * @param options the configuration options defined in {@link FaceDetectionOptions}.
+   */
+  public FaceDetection(Context context, FaceDetectionOptions options) {
+    outputHandler = new OutputHandler<>();
+    outputHandler.setOutputConverter(
+        packets -> {
+          FaceDetectionResult.Builder faceMeshResultBuilder = FaceDetectionResult.builder();
+          try {
+            faceMeshResultBuilder.setMultiFaceDetections(
+                getProtoVector(packets.get(DETECTIONS_INDEX), Detection.parser()));
+          } catch (MediaPipeException e) {
+            reportError("Error occurs while getting MediaPipe face detection results.", e);
+          }
+          return faceMeshResultBuilder
+              .setImagePacket(packets.get(INPUT_IMAGE_INDEX))
+              .setTimestamp(
+                  staticImageMode ? Long.MIN_VALUE : packets.get(INPUT_IMAGE_INDEX).getTimestamp())
+              .build();
+        });
+
+    SolutionInfo solutionInfo =
+        SolutionInfo.builder()
+            .setBinaryGraphPath(
+                options.modelSelection() == 0 ? SHORT_RANGE_GRAPH_NAME : FULL_RANGE_GRAPH_NAME)
+            .setImageInputStreamName(IMAGE_INPUT_STREAM)
+            .setOutputStreamNames(OUTPUT_STREAMS)
+            .setStaticImageMode(options.staticImageMode())
+            .build();
+
+    initialize(context, solutionInfo, outputHandler);
+    Map<String, Packet> emptyInputSidePackets = new HashMap<>();
+    start(emptyInputSidePackets);
+  }
+
+  /**
+   * Sets a callback to be invoked when a {@link FaceDetectionResult} becomes available.
+   *
+   * @param listener the {@link ResultListener} callback.
+   */
+  public void setResultListener(ResultListener<FaceDetectionResult> listener) {
+    this.outputHandler.setResultListener(listener);
+  }
+
+  /**
+   * Sets a callback to be invoked when the Face Detection solution throws errors.
+   *
+   * @param listener the {@link ErrorListener} callback.
+   */
+  public void setErrorListener(@Nullable ErrorListener listener) {
+    this.outputHandler.setErrorListener(listener);
+    this.errorListener = listener;
+  }
+
+  /**
+   * Gets a specific face keypoint by face index and face keypoint type.
+   *
+   * @param result the returned {@link FaceDetectionResult} object.
+   * @param faceIndex the face index. A smaller index maps to a detected face with a higher
+   *     confidence score.
+   * @param faceKeypointType the face keypoint type defined in {@link FaceKeypoint}.
+   */
+  public static RelativeKeypoint getFaceKeypoint(
+      FaceDetectionResult result,
+      int faceIndex,
+      @FaceKeypoint.FaceKeypointType int faceKeypointType) {
+    if (result == null
+        || faceIndex >= result.multiFaceDetections().size()
+        || faceKeypointType >= FaceKeypoint.NUM_KEY_POINTS) {
+      return RelativeKeypoint.getDefaultInstance();
+    }
+    Detection detection = result.multiFaceDetections().get(faceIndex);
+    float x = detection.getLocationData().getRelativeKeypoints(faceKeypointType).getX();
+    float y = detection.getLocationData().getRelativeKeypoints(faceKeypointType).getY();
+    return RelativeKeypoint.newBuilder().setX(x).setY(y).build();
+  }
+}

mediapipe/java/com/google/mediapipe/solutions/facedetection/FaceDetectionOptions.java

@@ -0,0 +1,61 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.mediapipe.solutions.facedetection;
+
+import com.google.auto.value.AutoValue;
+
+/**
+ * MediaPipe Face Detection solution-specific options.
+ *
+ * <p>staticImageMode: Whether to treat the input images as a batch of static and possibly unrelated
+ * images, or a video stream. Default to false. See details in
+ * https://solutions.mediapipe.dev/face_detection#static_image_mode.
+ *
+ * <p>minDetectionConfidence: Minimum confidence value ([0.0, 1.0]) for face detection to be
+ * considered successful. See details in
+ * https://solutions.mediapipe.dev/face_detection#min_detection_confidence.
+ *
+ * <p>modelSelection: 0 or 1. 0 to select a short-range model that works best for faces within 2
+ * meters from the camera, and 1 for a full-range model best for faces within 5 meters. See details
+ * in https://solutions.mediapipe.dev/face_detection#model_selection.
+ */
+@AutoValue
+public abstract class FaceDetectionOptions {
+  public abstract boolean staticImageMode();
+
+  public abstract int modelSelection();
+
+  public abstract float minDetectionConfidence();
+
+  public static Builder builder() {
+    return new AutoValue_FaceDetectionOptions.Builder().withDefaultValues();
+  }
+
+  /** Builder for {@link FaceDetectionOptions}. */
+  @AutoValue.Builder
+  public abstract static class Builder {
+    public Builder withDefaultValues() {
+      return setStaticImageMode(false).setModelSelection(0).setMinDetectionConfidence(0.5f);
+    }
+
+    public abstract Builder setStaticImageMode(boolean value);
+
+    public abstract Builder setModelSelection(int value);
+
+    public abstract Builder setMinDetectionConfidence(float value);
+
+    public abstract FaceDetectionOptions build();
+  }
+}

mediapipe/java/com/google/mediapipe/solutions/facedetection/FaceDetectionResult.java

@@ -0,0 +1,65 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.mediapipe.solutions.facedetection;
+
+import android.graphics.Bitmap;
+import com.google.auto.value.AutoBuilder;
+import com.google.common.collect.ImmutableList;
+import com.google.mediapipe.formats.proto.DetectionProto.Detection;
+import com.google.mediapipe.framework.Packet;
+import com.google.mediapipe.framework.TextureFrame;
+import com.google.mediapipe.solutioncore.ImageSolutionResult;
+import java.util.List;
+
+/**
+ * FaceDetectionResult contains the detected faces, and the input {@link Bitmap} or {@link
+ * TextureFrame}. If not in static image mode, the timestamp field will be set to the timestamp of
+ * the corresponding input image.
+ */
+public class FaceDetectionResult extends ImageSolutionResult {
+  private final ImmutableList<Detection> multiFaceDetections;
+
+  FaceDetectionResult(
+      ImmutableList<Detection> multiFaceDetections, Packet imagePacket, long timestamp) {
+    this.multiFaceDetections = multiFaceDetections;
+    this.timestamp = timestamp;
+    this.imagePacket = imagePacket;
+  }
+
+  // Collection of detected faces, where each face is represented as a detection proto message that
+  // contains a bounding box and 6 {@link FaceKeypoint}s. The bounding box is composed of xmin and
+  // width (both normalized to [0.0, 1.0] by the image width) and ymin and height (both normalized
+  // to [0.0, 1.0] by the image height). Each keypoint is composed of x and y, which are normalized
+  // to [0.0, 1.0] by the image width and height respectively.
+  public ImmutableList<Detection> multiFaceDetections() {
+    return multiFaceDetections;
+  }
+
+  public static Builder builder() {
+    return new AutoBuilder_FaceDetectionResult_Builder();
+  }
+
+  /** Builder for {@link FaceDetectionResult}. */
+  @AutoBuilder
+  public abstract static class Builder {
+    abstract Builder setMultiFaceDetections(List<Detection> value);
+
+    abstract Builder setTimestamp(long value);
+
+    abstract Builder setImagePacket(Packet value);
+
+    abstract FaceDetectionResult build();
+  }
+}

mediapipe/java/com/google/mediapipe/solutions/facedetection/FaceKeypoint.java

@@ -0,0 +1,42 @@
+// Copyright 2021 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.mediapipe.solutions.facedetection;
+
+import androidx.annotation.IntDef;
+
+/** The 6 face keypoints. */
+public final class FaceKeypoint {
+  public static final int NUM_KEY_POINTS = 6;
+
+  public static final int RIGHT_EYE = 0;
+  public static final int LEFT_EYE = 1;
+  public static final int NOSE_TIP = 2;
+  public static final int MOUTH_CENTER = 3;
+  public static final int RIGHT_EAR_TRAGION = 4;
+  public static final int LEFT_EAR_TRAGION = 5;
+
+  /** Represents a face keypoint type. */
+  @IntDef({
+    RIGHT_EYE,
+    LEFT_EYE,
+    NOSE_TIP,
+    MOUTH_CENTER,
+    RIGHT_EAR_TRAGION,
+    LEFT_EAR_TRAGION,
+  })
+  public @interface FaceKeypointType {}
+
+  private FaceKeypoint() {}
+}

mediapipe/java/com/google/mediapipe/solutions/facemesh/BUILD

@@ -25,6 +25,7 @@ android_library(
     assets = [
         "//mediapipe/modules/face_detection:face_detection_short_range.tflite",
         "//mediapipe/modules/face_landmark:face_landmark.tflite",
+        "//mediapipe/modules/face_landmark:face_landmark_with_attention.tflite",
         "//mediapipe/modules/face_landmark:face_landmark_front_cpu_image.binarypb",
         "//mediapipe/modules/face_landmark:face_landmark_front_gpu_image.binarypb",
     ],

mediapipe/java/com/google/mediapipe/solutions/facemesh/FaceMesh.java

@@ -38,15 +38,20 @@ import javax.annotation.Nullable;
 public class FaceMesh extends ImageSolutionBase {
   private static final String TAG = "FaceMesh";
 
+  public static final int FACEMESH_NUM_LANDMARKS = 468;
+  public static final int FACEMESH_NUM_LANDMARKS_WITH_IRISES = 478;
+
   private static final String NUM_FACES = "num_faces";
+  private static final String WITH_ATTENTION = "with_attention";
+  private static final String USE_PREV_LANDMARKS = "use_prev_landmarks";
   private static final String GPU_GRAPH_NAME = "face_landmark_front_gpu_image.binarypb";
   private static final String CPU_GRAPH_NAME = "face_landmark_front_cpu_image.binarypb";
   private static final String IMAGE_INPUT_STREAM = "image";
   private static final ImmutableList<String> OUTPUT_STREAMS =
-      ImmutableList.of("multi_face_landmarks", "image");
+      ImmutableList.of("multi_face_landmarks", "throttled_image");
   private static final int LANDMARKS_INDEX = 0;
   private static final int INPUT_IMAGE_INDEX = 1;
-  private final OutputHandler<FaceMeshResult> graphOutputHandler;
+  private final OutputHandler<FaceMeshResult> outputHandler;
 
   /**
    * Initializes MediaPipe Face Mesh solution.
@@ -55,15 +60,15 @@ public class FaceMesh extends ImageSolutionBase {
    * @param options the configuration options defined in {@link FaceMeshOptions}.
    */
   public FaceMesh(Context context, FaceMeshOptions options) {
-    graphOutputHandler = new OutputHandler<>();
-    graphOutputHandler.setOutputConverter(
+    outputHandler = new OutputHandler<>();
+    outputHandler.setOutputConverter(
         packets -> {
           FaceMeshResult.Builder faceMeshResultBuilder = FaceMeshResult.builder();
           try {
             faceMeshResultBuilder.setMultiFaceLandmarks(
                 getProtoVector(packets.get(LANDMARKS_INDEX), NormalizedLandmarkList.parser()));
           } catch (MediaPipeException e) {
-            throwException("Error occurs when getting MediaPipe facemesh landmarks. ", e);
+            reportError("Error occurs when getting MediaPipe facemesh landmarks.", e);
           }
           return faceMeshResultBuilder
               .setImagePacket(packets.get(INPUT_IMAGE_INDEX))
@@ -77,22 +82,24 @@ public class FaceMesh extends ImageSolutionBase {
             .setBinaryGraphPath(options.runOnGpu() ? GPU_GRAPH_NAME : CPU_GRAPH_NAME)
             .setImageInputStreamName(IMAGE_INPUT_STREAM)
             .setOutputStreamNames(OUTPUT_STREAMS)
-            .setStaticImageMode(options.mode() == FaceMeshOptions.STATIC_IMAGE_MODE)
+            .setStaticImageMode(options.staticImageMode())
             .build();
 
-    initialize(context, solutionInfo, graphOutputHandler);
+    initialize(context, solutionInfo, outputHandler);
     Map<String, Packet> inputSidePackets = new HashMap<>();
     inputSidePackets.put(NUM_FACES, packetCreator.createInt32(options.maxNumFaces()));
+    inputSidePackets.put(WITH_ATTENTION, packetCreator.createBool(options.refineLandmarks()));
+    inputSidePackets.put(USE_PREV_LANDMARKS, packetCreator.createBool(!options.staticImageMode()));
     start(inputSidePackets);
   }
 
   /**
-   * Sets a callback to be invoked when the FaceMeshResults become available.
+   * Sets a callback to be invoked when a {@link FaceMeshResult} becomes available.
    *
    * @param listener the {@link ResultListener} callback.
    */
   public void setResultListener(ResultListener<FaceMeshResult> listener) {
-    this.graphOutputHandler.setResultListener(listener);
+    this.outputHandler.setResultListener(listener);
   }
 
   /**
@@ -101,7 +108,7 @@ public class FaceMesh extends ImageSolutionBase {
    * @param listener the {@link ErrorListener} callback.
    */
   public void setErrorListener(@Nullable ErrorListener listener) {
-    this.graphOutputHandler.setErrorListener(listener);
+    this.outputHandler.setErrorListener(listener);
     this.errorListener = listener;
   }
 }