From 9b00582f21fcf9b8db06aa484b7281542c21c5b7 Mon Sep 17 00:00:00 2001
From: MediaPipe Team <mediapipe-team@google.com>
Date: Tue, 18 Jul 2023 14:13:17 -0700
Subject: [PATCH] add hand landmarks connections in C++ API.

PiperOrigin-RevId: 549108307
---
 .../tasks/cc/vision/hand_landmarker/BUILD     |  5 ++
 .../hand_landmarks_connections.h              | 54 +++++++++++++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 mediapipe/tasks/cc/vision/hand_landmarker/hand_landmarks_connections.h

diff --git a/mediapipe/tasks/cc/vision/hand_landmarker/BUILD b/mediapipe/tasks/cc/vision/hand_landmarker/BUILD
index f2afac494..1e24256d1 100644
--- a/mediapipe/tasks/cc/vision/hand_landmarker/BUILD
+++ b/mediapipe/tasks/cc/vision/hand_landmarker/BUILD
@@ -153,6 +153,11 @@ cc_library(
     alwayslink = 1,
 )
 
+cc_library(
+    name = "hand_landmarks_connections",
+    hdrs = ["hand_landmarks_connections.h"],
+)
+
 # TODO: open source hand joints graph
 
 cc_library(
diff --git a/mediapipe/tasks/cc/vision/hand_landmarker/hand_landmarks_connections.h b/mediapipe/tasks/cc/vision/hand_landmarker/hand_landmarks_connections.h
new file mode 100644
index 000000000..510820294
--- /dev/null
+++ b/mediapipe/tasks/cc/vision/hand_landmarker/hand_landmarks_connections.h
@@ -0,0 +1,54 @@
+/* Copyright 2023 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_TASKS_CC_VISION_HAND_LANDMARKER_HAND_LANDMARKS_CONNECTIONS_H_
+#define MEDIAPIPE_TASKS_CC_VISION_HAND_LANDMARKER_HAND_LANDMARKS_CONNECTIONS_H_
+
+#include <array>
+
+namespace mediapipe {
+namespace tasks {
+namespace vision {
+namespace hand_landmarker {
+
+static constexpr std::array<std::array<int, 2>, 6> kHandPalmConnections{
+    {{0, 1}, {0, 5}, {9, 13}, {13, 17}, {5, 9}, {0, 17}}};
+
+static constexpr std::array<std::array<int, 2>, 3> kHandThumbConnections{
+    {{1, 2}, {2, 3}, {3, 4}}};
+
+static constexpr std::array<std::array<int, 2>, 3> kHandIndexFingerConnections{
+    {{5, 6}, {6, 7}, {7, 8}}};
+
+static constexpr std::array<std::array<int, 2>, 3> kHandMiddleFingerConnections{
+    {{9, 10}, {10, 11}, {11, 12}}};
+
+static constexpr std::array<std::array<int, 2>, 3> kHandRingFingerConnections{
+    {{13, 14}, {14, 15}, {15, 16}}};
+
+static constexpr std::array<std::array<int, 2>, 3> kHandPinkyFingerConnections{
+    {{17, 18}, {18, 19}, {19, 20}}};
+
+static constexpr std::array<std::array<int, 2>, 21> kHandConnections{
+    {{0, 1},   {0, 5},   {9, 13},  {13, 17}, {5, 9},   {0, 17},  {1, 2},
+     {2, 3},   {3, 4},   {5, 6},   {6, 7},   {7, 8},   {9, 10},  {10, 11},
+     {11, 12}, {13, 14}, {14, 15}, {15, 16}, {17, 18}, {18, 19}, {19, 20}}};
+
+}  // namespace hand_landmarker
+}  // namespace vision
+}  // namespace tasks
+}  // namespace mediapipe
+
+#endif  // MEDIAPIPE_TASKS_CC_VISION_HAND_LANDMARKER_HAND_LANDMARKS_CONNECTIONS_H_