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-2-mixedprocessing/CMakeLists.txt

@@ -0,0 +1,12 @@
+set(sample example-tutorial-2-mixedprocessing)
+
+if(BUILD_FAT_JAVA_LIB)
+  set(native_deps opencv_java)
+else()
+  set(native_deps opencv_features2d)
+endif()
+
+add_android_project(${sample} "${CMAKE_CURRENT_SOURCE_DIR}" LIBRARY_DEPS "${OPENCV_ANDROID_LIB_DIR}" SDK_TARGET 11 "${ANDROID_SDK_TARGET}" NATIVE_DEPS ${native_deps})
+if(TARGET ${sample})
+  add_dependencies(opencv_android_examples ${sample})
+endif()

3rdparty/opencv-4.5.4/samples/android/tutorial-2-mixedprocessing/build.gradle.in

@@ -0,0 +1,43 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion @ANDROID_COMPILE_SDK_VERSION@
+    defaultConfig {
+        applicationId "org.opencv.samples.tutorial2"
+        minSdkVersion @ANDROID_MIN_SDK_VERSION@
+        targetSdkVersion @ANDROID_TARGET_SDK_VERSION@
+        versionCode 301
+        versionName "3.01"
+
+        externalNativeBuild {
+            cmake {
+                arguments "-DOpenCV_DIR=" + project(':opencv').projectDir + "/@ANDROID_PROJECT_JNI_PATH@"@OPENCV_ANDROID_CMAKE_EXTRA_ARGS@
+                targets "mixed_sample"
+            }
+        }
+    }
+    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@'
+        }
+    }
+    externalNativeBuild {
+        cmake {
+             path '@ANDROID_SAMPLE_JNI_PATH@/CMakeLists.txt'
+        }
+    }
+}
+
+dependencies {
+    //implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation project(':opencv')
+}

3rdparty/opencv-4.5.4/samples/android/tutorial-2-mixedprocessing/gradle/AndroidManifest.xml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="org.opencv.samples.tutorial2"
+>
+
+    <application
+        android:label="@string/app_name"
+        android:icon="@drawable/icon">
+
+        <activity android:name="Tutorial2Activity"
+                  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-2-mixedprocessing/jni/Android.mk

@@ -0,0 +1,19 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+ifdef OPENCV_ANDROID_SDK
+  ifneq ("","$(wildcard $(OPENCV_ANDROID_SDK)/OpenCV.mk)")
+    include ${OPENCV_ANDROID_SDK}/OpenCV.mk
+  else
+    include ${OPENCV_ANDROID_SDK}/sdk/native/jni/OpenCV.mk
+  endif
+else
+  include ../../sdk/native/jni/OpenCV.mk
+endif
+
+LOCAL_MODULE    := mixed_sample
+LOCAL_SRC_FILES := jni_part.cpp
+LOCAL_LDLIBS +=  -llog -ldl
+
+include $(BUILD_SHARED_LIBRARY)

3rdparty/opencv-4.5.4/samples/android/tutorial-2-mixedprocessing/jni/Application.mk

@@ -0,0 +1,4 @@
+APP_STL := gnustl_static
+APP_CPPFLAGS := -frtti -fexceptions
+APP_ABI := armeabi-v7a
+APP_PLATFORM := android-8

3rdparty/opencv-4.5.4/samples/android/tutorial-2-mixedprocessing/jni/CMakeLists.txt

@@ -0,0 +1,15 @@
+cmake_minimum_required(VERSION 3.6)
+
+set(target mixed_sample)
+project(${target} CXX)
+
+set(ANDROID_OPENCV_COMPONENTS "opencv_java" CACHE STRING "")
+message(STATUS "ANDROID_ABI=${ANDROID_ABI}")
+find_package(OpenCV REQUIRED COMPONENTS ${ANDROID_OPENCV_COMPONENTS})
+
+file(GLOB srcs *.cpp *.c)
+file(GLOB hdrs *.hpp *.h)
+
+include_directories("${CMAKE_CURRENT_LIST_DIR}")
+add_library(${target} SHARED ${srcs} ${hdrs})
+target_link_libraries(${target} ${ANDROID_OPENCV_COMPONENTS})

3rdparty/opencv-4.5.4/samples/android/tutorial-2-mixedprocessing/jni/jni_part.cpp

@@ -0,0 +1,27 @@
+#include <jni.h>
+#include <opencv2/core.hpp>
+#include <opencv2/imgproc.hpp>
+#include <opencv2/features2d.hpp>
+#include <vector>
+
+using namespace std;
+using namespace cv;
+
+extern "C" {
+JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial2_Tutorial2Activity_FindFeatures(JNIEnv*, jobject, jlong addrGray, jlong addrRgba);
+
+JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial2_Tutorial2Activity_FindFeatures(JNIEnv*, jobject, jlong addrGray, jlong addrRgba)
+{
+    Mat& mGr  = *(Mat*)addrGray;
+    Mat& mRgb = *(Mat*)addrRgba;
+    vector<KeyPoint> v;
+
+    Ptr<FeatureDetector> detector = FastFeatureDetector::create(50);
+    detector->detect(mGr, v);
+    for( unsigned int i = 0; i < v.size(); i++ )
+    {
+        const KeyPoint& kp = v[i];
+        circle(mRgb, Point(kp.pt.x, kp.pt.y), 10, Scalar(255,0,0,255));
+    }
+}
+}

3rdparty/opencv-4.5.4/samples/android/tutorial-2-mixedprocessing/res/layout/tutorial2_surface_view.xml

@@ -0,0 +1,11 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    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:id="@+id/tutorial2_activity_surface_view" />
+
+</LinearLayout>

3rdparty/opencv-4.5.4/samples/android/tutorial-2-mixedprocessing/res/values/strings.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">OCV T2 Mixed Processing</string>
+</resources>

3rdparty/opencv-4.5.4/samples/android/tutorial-2-mixedprocessing/src/org/opencv/samples/tutorial2/Tutorial2Activity.java

@@ -0,0 +1,181 @@
+package org.opencv.samples.tutorial2;
+
+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.CvType;
+import org.opencv.core.Mat;
+import org.opencv.android.CameraBridgeViewBase;
+import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener2;
+import org.opencv.imgproc.Imgproc;
+
+import android.os.Bundle;
+import android.util.Log;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.WindowManager;
+
+import java.util.Collections;
+import java.util.List;
+
+public class Tutorial2Activity extends CameraActivity implements CvCameraViewListener2 {
+    private static final String    TAG = "OCVSample::Activity";
+
+    private static final int       VIEW_MODE_RGBA     = 0;
+    private static final int       VIEW_MODE_GRAY     = 1;
+    private static final int       VIEW_MODE_CANNY    = 2;
+    private static final int       VIEW_MODE_FEATURES = 5;
+
+    private int                    mViewMode;
+    private Mat                    mRgba;
+    private Mat                    mIntermediateMat;
+    private Mat                    mGray;
+
+    private MenuItem               mItemPreviewRGBA;
+    private MenuItem               mItemPreviewGray;
+    private MenuItem               mItemPreviewCanny;
+    private MenuItem               mItemPreviewFeatures;
+
+    private CameraBridgeViewBase   mOpenCvCameraView;
+
+    private BaseLoaderCallback  mLoaderCallback = new BaseLoaderCallback(this) {
+        @Override
+        public void onManagerConnected(int status) {
+            switch (status) {
+                case LoaderCallbackInterface.SUCCESS:
+                {
+                    Log.i(TAG, "OpenCV loaded successfully");
+
+                    // Load native library after(!) OpenCV initialization
+                    System.loadLibrary("mixed_sample");
+
+                    mOpenCvCameraView.enableView();
+                } break;
+                default:
+                {
+                    super.onManagerConnected(status);
+                } break;
+            }
+        }
+    };
+
+    public Tutorial2Activity() {
+        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.tutorial2_surface_view);
+
+        mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.tutorial2_activity_surface_view);
+        mOpenCvCameraView.setVisibility(CameraBridgeViewBase.VISIBLE);
+        mOpenCvCameraView.setCvCameraViewListener(this);
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        Log.i(TAG, "called onCreateOptionsMenu");
+        mItemPreviewRGBA = menu.add("Preview RGBA");
+        mItemPreviewGray = menu.add("Preview GRAY");
+        mItemPreviewCanny = menu.add("Canny");
+        mItemPreviewFeatures = menu.add("Find features");
+        return true;
+    }
+
+    @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) {
+        mRgba = new Mat(height, width, CvType.CV_8UC4);
+        mIntermediateMat = new Mat(height, width, CvType.CV_8UC4);
+        mGray = new Mat(height, width, CvType.CV_8UC1);
+    }
+
+    public void onCameraViewStopped() {
+        mRgba.release();
+        mGray.release();
+        mIntermediateMat.release();
+    }
+
+    public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
+        final int viewMode = mViewMode;
+        switch (viewMode) {
+        case VIEW_MODE_GRAY:
+            // input frame has gray scale format
+            Imgproc.cvtColor(inputFrame.gray(), mRgba, Imgproc.COLOR_GRAY2RGBA, 4);
+            break;
+        case VIEW_MODE_RGBA:
+            // input frame has RBGA format
+            mRgba = inputFrame.rgba();
+            break;
+        case VIEW_MODE_CANNY:
+            // input frame has gray scale format
+            mRgba = inputFrame.rgba();
+            Imgproc.Canny(inputFrame.gray(), mIntermediateMat, 80, 100);
+            Imgproc.cvtColor(mIntermediateMat, mRgba, Imgproc.COLOR_GRAY2RGBA, 4);
+            break;
+        case VIEW_MODE_FEATURES:
+            // input frame has RGBA format
+            mRgba = inputFrame.rgba();
+            mGray = inputFrame.gray();
+            FindFeatures(mGray.getNativeObjAddr(), mRgba.getNativeObjAddr());
+            break;
+        }
+
+        return mRgba;
+    }
+
+    public boolean onOptionsItemSelected(MenuItem item) {
+        Log.i(TAG, "called onOptionsItemSelected; selected item: " + item);
+
+        if (item == mItemPreviewRGBA) {
+            mViewMode = VIEW_MODE_RGBA;
+        } else if (item == mItemPreviewGray) {
+            mViewMode = VIEW_MODE_GRAY;
+        } else if (item == mItemPreviewCanny) {
+            mViewMode = VIEW_MODE_CANNY;
+        } else if (item == mItemPreviewFeatures) {
+            mViewMode = VIEW_MODE_FEATURES;
+        }
+
+        return true;
+    }
+
+    public native void FindFeatures(long matAddrGr, long matAddrRgba);
+}