138 lines
4.6 KiB
C++
138 lines
4.6 KiB
C++
//
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// Created by fujiayi on 2020/7/5.
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//
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#pragma once
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#include "common.h"
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#include <android/bitmap.h>
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#include <jni.h>
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#include <opencv2/opencv.hpp>
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#include <string>
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#include <vector>
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inline std::string jstring_to_cpp_string(JNIEnv *env, jstring jstr) {
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// In java, a unicode char will be encoded using 2 bytes (utf16).
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// so jstring will contain characters utf16. std::string in c++ is
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// essentially a string of bytes, not characters, so if we want to
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// pass jstring from JNI to c++, we have convert utf16 to bytes.
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if (!jstr) {
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return "";
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}
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const jclass stringClass = env->GetObjectClass(jstr);
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const jmethodID getBytes =
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env->GetMethodID(stringClass, "getBytes", "(Ljava/lang/String;)[B");
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const jbyteArray stringJbytes = (jbyteArray)env->CallObjectMethod(
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jstr, getBytes, env->NewStringUTF("UTF-8"));
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size_t length = (size_t)env->GetArrayLength(stringJbytes);
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jbyte *pBytes = env->GetByteArrayElements(stringJbytes, NULL);
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std::string ret = std::string(reinterpret_cast<char *>(pBytes), length);
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env->ReleaseByteArrayElements(stringJbytes, pBytes, JNI_ABORT);
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env->DeleteLocalRef(stringJbytes);
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env->DeleteLocalRef(stringClass);
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return ret;
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}
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inline jstring cpp_string_to_jstring(JNIEnv *env, std::string str) {
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auto *data = str.c_str();
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jclass strClass = env->FindClass("java/lang/String");
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jmethodID strClassInitMethodID =
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env->GetMethodID(strClass, "<init>", "([BLjava/lang/String;)V");
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jbyteArray bytes = env->NewByteArray(strlen(data));
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env->SetByteArrayRegion(bytes, 0, strlen(data),
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reinterpret_cast<const jbyte *>(data));
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jstring encoding = env->NewStringUTF("UTF-8");
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jstring res = (jstring)(
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env->NewObject(strClass, strClassInitMethodID, bytes, encoding));
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env->DeleteLocalRef(strClass);
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env->DeleteLocalRef(encoding);
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env->DeleteLocalRef(bytes);
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return res;
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}
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inline jfloatArray cpp_array_to_jfloatarray(JNIEnv *env, const float *buf,
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int64_t len) {
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if (len == 0) {
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return env->NewFloatArray(0);
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}
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jfloatArray result = env->NewFloatArray(len);
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env->SetFloatArrayRegion(result, 0, len, buf);
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return result;
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}
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inline jintArray cpp_array_to_jintarray(JNIEnv *env, const int *buf,
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int64_t len) {
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jintArray result = env->NewIntArray(len);
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env->SetIntArrayRegion(result, 0, len, buf);
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return result;
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}
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inline jbyteArray cpp_array_to_jbytearray(JNIEnv *env, const int8_t *buf,
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int64_t len) {
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jbyteArray result = env->NewByteArray(len);
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env->SetByteArrayRegion(result, 0, len, buf);
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return result;
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}
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inline jlongArray int64_vector_to_jlongarray(JNIEnv *env,
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const std::vector<int64_t> &vec) {
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jlongArray result = env->NewLongArray(vec.size());
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jlong *buf = new jlong[vec.size()];
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for (size_t i = 0; i < vec.size(); ++i) {
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buf[i] = (jlong)vec[i];
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}
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env->SetLongArrayRegion(result, 0, vec.size(), buf);
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delete[] buf;
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return result;
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}
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inline std::vector<int64_t> jlongarray_to_int64_vector(JNIEnv *env,
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jlongArray data) {
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int data_size = env->GetArrayLength(data);
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jlong *data_ptr = env->GetLongArrayElements(data, nullptr);
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std::vector<int64_t> data_vec(data_ptr, data_ptr + data_size);
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env->ReleaseLongArrayElements(data, data_ptr, 0);
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return data_vec;
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}
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inline std::vector<float> jfloatarray_to_float_vector(JNIEnv *env,
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jfloatArray data) {
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int data_size = env->GetArrayLength(data);
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jfloat *data_ptr = env->GetFloatArrayElements(data, nullptr);
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std::vector<float> data_vec(data_ptr, data_ptr + data_size);
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env->ReleaseFloatArrayElements(data, data_ptr, 0);
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return data_vec;
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}
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inline cv::Mat bitmap_to_cv_mat(JNIEnv *env, jobject bitmap) {
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AndroidBitmapInfo info;
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int result = AndroidBitmap_getInfo(env, bitmap, &info);
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if (result != ANDROID_BITMAP_RESULT_SUCCESS) {
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LOGE("AndroidBitmap_getInfo failed, result: %d", result);
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return cv::Mat{};
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}
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if (info.format != ANDROID_BITMAP_FORMAT_RGBA_8888) {
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LOGE("Bitmap format is not RGBA_8888 !");
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return cv::Mat{};
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}
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unsigned char *srcData = NULL;
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AndroidBitmap_lockPixels(env, bitmap, (void **)&srcData);
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cv::Mat mat = cv::Mat::zeros(info.height, info.width, CV_8UC4);
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memcpy(mat.data, srcData, info.height * info.width * 4);
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AndroidBitmap_unlockPixels(env, bitmap);
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cv::cvtColor(mat, mat, cv::COLOR_RGBA2BGR);
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/**
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if (!cv::imwrite("/sdcard/1/copy.jpg", mat)){
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LOGE("Write image failed " );
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}
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*/
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return mat;
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}
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