feat: 切换后端至PaddleOCR-NCNN，切换工程为CMake

1.项目后端整体迁移至PaddleOCR-NCNN算法，已通过基本的兼容性测试
2.工程改为使用CMake组织，后续为了更好地兼容第三方库，不再提供QMake工程
3.重整权利声明文件，重整代码工程，确保最小化侵权风险

Log: 切换后端至PaddleOCR-NCNN，切换工程为CMake
Change-Id: I4d5d2c5d37505a4a24b389b1a4c5d12f17bfa38c

3rdparty/opencv-4.5.4/samples/android/tutorial-1-camerapreview/CMakeLists.txt

@@ -0,0 +1,6 @@
+set(sample example-tutorial-1-camerapreview)
+
+add_android_project(${sample} "${CMAKE_CURRENT_SOURCE_DIR}" LIBRARY_DEPS "${OPENCV_ANDROID_LIB_DIR}" SDK_TARGET 11 "${ANDROID_SDK_TARGET}")
+if(TARGET ${sample})
+  add_dependencies(opencv_android_examples ${sample})
+endif()

3rdparty/opencv-4.5.4/samples/android/tutorial-1-camerapreview/build.gradle.in

@@ -0,0 +1,31 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion @ANDROID_COMPILE_SDK_VERSION@
+    defaultConfig {
+        applicationId "org.opencv.samples.tutorial1"
+        minSdkVersion @ANDROID_MIN_SDK_VERSION@
+        targetSdkVersion @ANDROID_TARGET_SDK_VERSION@
+        versionCode 301
+        versionName "3.01"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+    sourceSets {
+        main {
+            java.srcDirs = @ANDROID_SAMPLE_JAVA_PATH@
+            aidl.srcDirs = @ANDROID_SAMPLE_JAVA_PATH@
+            res.srcDirs = @ANDROID_SAMPLE_RES_PATH@
+            manifest.srcFile '@ANDROID_SAMPLE_MANIFEST_PATH@'
+        }
+    }
+}
+
+dependencies {
+    //implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation project(':opencv')
+}

3rdparty/opencv-4.5.4/samples/android/tutorial-1-camerapreview/gradle/AndroidManifest.xml

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="org.opencv.samples.tutorial1"
+>
+
+    <application
+        android:label="@string/app_name"
+        android:icon="@drawable/icon"
+        android:theme="@android:style/Theme.NoTitleBar.Fullscreen" >
+
+        <activity android:name="Tutorial1Activity"
+                  android:label="@string/app_name"
+                  android:screenOrientation="landscape"
+                  android:configChanges="keyboardHidden|orientation">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+    <supports-screens android:resizeable="true"
+                      android:smallScreens="true"
+                      android:normalScreens="true"
+                      android:largeScreens="true"
+                      android:anyDensity="true" />
+
+    <uses-permission android:name="android.permission.CAMERA"/>
+
+    <uses-feature android:name="android.hardware.camera" android:required="false"/>
+    <uses-feature android:name="android.hardware.camera.autofocus" android:required="false"/>
+    <uses-feature android:name="android.hardware.camera.front" android:required="false"/>
+    <uses-feature android:name="android.hardware.camera.front.autofocus" android:required="false"/>
+
+</manifest>

3rdparty/opencv-4.5.4/samples/android/tutorial-1-camerapreview/res/layout/tutorial1_surface_view.xml

@@ -0,0 +1,15 @@
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    xmlns:opencv="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent" >
+
+    <org.opencv.android.JavaCameraView
+        android:layout_width="fill_parent"
+        android:layout_height="fill_parent"
+        android:visibility="gone"
+        android:id="@+id/tutorial1_activity_java_surface_view"
+        opencv:show_fps="true"
+        opencv:camera_id="any" />
+
+</FrameLayout>

3rdparty/opencv-4.5.4/samples/android/tutorial-1-camerapreview/res/values/strings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">OCV T1 Preview</string>
+</resources>

3rdparty/opencv-4.5.4/samples/android/tutorial-1-camerapreview/src/org/opencv/samples/tutorial1/Tutorial1Activity.java

@@ -0,0 +1,106 @@
+package org.opencv.samples.tutorial1;
+
+import org.opencv.android.BaseLoaderCallback;
+import org.opencv.android.CameraActivity;
+import org.opencv.android.CameraBridgeViewBase.CvCameraViewFrame;
+import org.opencv.android.LoaderCallbackInterface;
+import org.opencv.android.OpenCVLoader;
+import org.opencv.core.Mat;
+import org.opencv.android.CameraBridgeViewBase;
+import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener2;
+
+import android.os.Bundle;
+import android.util.Log;
+import android.view.MenuItem;
+import android.view.SurfaceView;
+import android.view.WindowManager;
+
+import java.util.Collections;
+import java.util.List;
+
+public class Tutorial1Activity extends CameraActivity implements CvCameraViewListener2 {
+    private static final String TAG = "OCVSample::Activity";
+
+    private CameraBridgeViewBase mOpenCvCameraView;
+    private boolean              mIsJavaCamera = true;
+    private MenuItem             mItemSwitchCamera = null;
+
+    private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
+        @Override
+        public void onManagerConnected(int status) {
+            switch (status) {
+                case LoaderCallbackInterface.SUCCESS:
+                {
+                    Log.i(TAG, "OpenCV loaded successfully");
+                    mOpenCvCameraView.enableView();
+                } break;
+                default:
+                {
+                    super.onManagerConnected(status);
+                } break;
+            }
+        }
+    };
+
+    public Tutorial1Activity() {
+        Log.i(TAG, "Instantiated new " + this.getClass());
+    }
+
+    /** Called when the activity is first created. */
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        Log.i(TAG, "called onCreate");
+        super.onCreate(savedInstanceState);
+        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
+
+        setContentView(R.layout.tutorial1_surface_view);
+
+        mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.tutorial1_activity_java_surface_view);
+
+        mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);
+
+        mOpenCvCameraView.setCvCameraViewListener(this);
+    }
+
+    @Override
+    public void onPause()
+    {
+        super.onPause();
+        if (mOpenCvCameraView != null)
+            mOpenCvCameraView.disableView();
+    }
+
+    @Override
+    public void onResume()
+    {
+        super.onResume();
+        if (!OpenCVLoader.initDebug()) {
+            Log.d(TAG, "Internal OpenCV library not found. Using OpenCV Manager for initialization");
+            OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_0_0, this, mLoaderCallback);
+        } else {
+            Log.d(TAG, "OpenCV library found inside package. Using it!");
+            mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
+        }
+    }
+
+    @Override
+    protected List<? extends CameraBridgeViewBase> getCameraViewList() {
+        return Collections.singletonList(mOpenCvCameraView);
+    }
+
+    public void onDestroy() {
+        super.onDestroy();
+        if (mOpenCvCameraView != null)
+            mOpenCvCameraView.disableView();
+    }
+
+    public void onCameraViewStarted(int width, int height) {
+    }
+
+    public void onCameraViewStopped() {
+    }
+
+    public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
+        return inputFrame.rgba();
+    }
+}