C++在图片上画框和写汉字并保存

#include <iostream>
#include <ctype.h>
#include <ft2build.h>
#include FT_FREETYPE_H
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <sys/timeb.h>
#include <time.h>
#include <fstream>
#include <stdlib.h>
#include <string>
#include <vector>
#include <unistd.h>

using namespace std;

// //汉字
// int myputText(cv::Mat img, const char *text, cv::Point pos, cv::Scalar color);
// void myputWChar(cv::Mat img, wchar_t wc, cv::Point &pos, cv::Scalar color);

/*时间打印*/
char*   log_Time(void)
{
    struct  tm      *ptm;
    struct  timeb   stTimeb;
    static  char    szTime[19];

    ftime(&stTimeb);
    ptm = localtime(&stTimeb.time);
    sprintf(szTime, "%02d-%02d %02d:%02d:%02d.%03d",ptm->tm_mon+1, ptm->tm_mday, ptm->tm_hour, ptm->tm_min, ptm->tm_sec, stTimeb.millitm);
    szTime[18] = 0;
    return szTime;
}


class CvxText {
public:
    CvxText(const char* freeType);
    virtual ~CvxText();
    void getFont(int* type, cv::Scalar* size=NULL, bool* underline=NULL, float* diaphaneity=NULL);
    void setFont(int* type, cv::Scalar* size=NULL, bool* underline=NULL, float* diaphaneity=NULL);
    void restoreFont();
    int putText(cv::Mat& img, char* text, cv::Point pos);
    int putText(cv::Mat& img, const wchar_t* text, cv::Point pos);
    int putText(cv::Mat& img, const char* text, cv::Point pos, cv::Scalar color);
    int putText(cv::Mat& img, const wchar_t* text, cv::Point pos, cv::Scalar color);

private:
    CvxText& operator=(const CvxText&);
    void putWChar(cv::Mat& img, wchar_t wc, cv::Point& pos, cv::Scalar color);

    FT_Library   m_library;
    FT_Face      m_face;

    int         m_fontType;
    cv::Scalar   m_fontSize;
    bool      m_fontUnderline;
    float      m_fontDiaphaneity;
};

// 打开字库
CvxText::CvxText(const char* freeType)
{
    assert(freeType != NULL);

    // 打开字库文件, 创建一个字体
    if(FT_Init_FreeType(&m_library)) throw;
    if(FT_New_Face(m_library, freeType, 0, &m_face)) throw;

    // 设置字体输出参数
    restoreFont();

    // 设置C语言的字符集环境
    setlocale(LC_ALL, "");
}

// 释放FreeType资源
CvxText::~CvxText()
{
    FT_Done_Face(m_face);
    FT_Done_FreeType(m_library);
}

void CvxText::getFont(int* type, cv::Scalar* size, bool* underline, float* diaphaneity)
{
    if (type) *type = m_fontType;
    if (size) *size = m_fontSize;
    if (underline) *underline = m_fontUnderline;
    if (diaphaneity) *diaphaneity = m_fontDiaphaneity;
}

void CvxText::setFont(int* type, cv::Scalar* size, bool* underline, float* diaphaneity)
{
    // 参数合法性检查
    if (type) {
        if(type >= 0) m_fontType = *type;
    }
    if (size) {
        m_fontSize.val[0] = std::fabs(size->val[0]);
        m_fontSize.val[1] = std::fabs(size->val[1]);
        m_fontSize.val[2] = std::fabs(size->val[2]);
        m_fontSize.val[3] = std::fabs(size->val[3]);
    }
    if (underline) {
        m_fontUnderline   = *underline;
    }
    if (diaphaneity) {
        m_fontDiaphaneity = *diaphaneity;
    }

    FT_Set_Pixel_Sizes(m_face, (int)m_fontSize.val[0], 0);
}

// 恢复原始的字体设置
void CvxText::restoreFont()
{
    m_fontType = 0;            // 字体类型(不支持)

    m_fontSize.val[0] = 20;      // 字体大小
    m_fontSize.val[1] = 0.5;   // 空白字符大小比例
    m_fontSize.val[2] = 0.1;   // 间隔大小比例
    m_fontSize.val[3] = 0;      // 旋转角度(不支持)

    m_fontUnderline   = false;   // 下画线(不支持)

    m_fontDiaphaneity = 1.0;   // 色彩比例(可产生透明效果)

    // 设置字符大小
    FT_Set_Pixel_Sizes(m_face, (int)m_fontSize.val[0], 0);
}

// 输出函数(颜色默认为白色)
int CvxText::putText(cv::Mat& img, char* text, cv::Point pos)
{
    return putText(img, text, pos, CV_RGB(255, 255, 255));
}

int CvxText::putText(cv::Mat& img, const wchar_t* text, cv::Point pos)
{
    return putText(img, text, pos, CV_RGB(255,255,255));
}

int CvxText::putText(cv::Mat& img, const char* text, cv::Point pos, cv::Scalar color)
{
    if (img.data == NULL) return -1;
    if (text == NULL) return -1;

    int i;
    for (i = 0; text[i] != '\0'; ++i) {
        wchar_t wc = text[i];

        // 解析双字节符号
        if(!isascii(wc)) mbtowc(&wc, &text[i++], 2);

        // 输出当前的字符
        putWChar(img, wc, pos, color);
    }

    return i;
}

int CvxText::putText(cv::Mat& img, const wchar_t* text, cv::Point pos, cv::Scalar color)
{
    if (img.data == NULL) return -1;
    if (text == NULL) return -1;

    int i;
    for(i = 0; text[i] != '\0'; ++i) {
        // 输出当前的字符
        putWChar(img, text[i], pos, color);
    }

    return i;
}

// 输出当前字符, 更新m_pos位置
void CvxText::putWChar(cv::Mat& img, wchar_t wc, cv::Point& pos, cv::Scalar color)
{
    // 根据unicode生成字体的二值位图
    FT_UInt glyph_index = FT_Get_Char_Index(m_face, wc);
    FT_Load_Glyph(m_face, glyph_index, FT_LOAD_DEFAULT);
    FT_Render_Glyph(m_face->glyph, FT_RENDER_MODE_MONO);

    FT_GlyphSlot slot = m_face->glyph;

    // 行列数
    int rows = slot->bitmap.rows;
    int cols = slot->bitmap.width;

    for (int i = 0; i < rows; ++i) {
        for(int j = 0; j < cols; ++j) {
            int off  = i * slot->bitmap.pitch + j/8;

            if (slot->bitmap.buffer[off] & (0xC0 >> (j%8))) {
                int r = pos.y - (rows-1-i);
                int c = pos.x + j;

                if(r >= 0 && r < img.rows && c >= 0 && c < img.cols) {
                    cv::Vec3b pixel = img.at<cv::Vec3b>(cv::Point(c, r));
                    cv::Scalar scalar = cv::Scalar(pixel.val[0], pixel.val[1], pixel.val[2]);

                    // 进行色彩融合
                    float p = m_fontDiaphaneity;
                    for (int k = 0; k < 4; ++k) {
                        scalar.val[k] = scalar.val[k]*(1-p) + color.val[k]*p;
                    }

                    img.at<cv::Vec3b>(cv::Point(c, r))[0] = (unsigned char)(scalar.val[0]);
                    img.at<cv::Vec3b>(cv::Point(c, r))[1] = (unsigned char)(scalar.val[1]);
                    img.at<cv::Vec3b>(cv::Point(c, r))[2] = (unsigned char)(scalar.val[2]);
                }
            }
        }
    }

    // 修改下一个字的输出位置
    double space = m_fontSize.val[0]*m_fontSize.val[1];
    double sep   = m_fontSize.val[0]*m_fontSize.val[2];

    pos.x += (int)((cols? cols: space) + sep);
}

static int ToWchar(char* &src, wchar_t* &dest, const char *locale = "zh_CN.utf8")
{
    if (src == NULL) {
        dest = NULL;
        return 0;
    }

    // 根据环境变量设置locale
    setlocale(LC_CTYPE, locale);

    // 得到转化为需要的宽字符大小
    int w_size = mbstowcs(NULL, src, 0) + 1;

    // w_size = 0 说明mbstowcs返回值为-1。即在运行过程中遇到了非法字符(很有可能使locale
    // 没有设置正确)
    if (w_size == 0) {
        dest = NULL;
        return -1;
    }

    //wcout << "w_size" << w_size << endl;
    dest = new wchar_t[w_size];
    if (!dest) {
        return -1;
    }

    int ret = mbstowcs(dest, src, strlen(src)+1);
    if (ret <= 0) {
        return -1;
    }
    return 0;
}

int wmain() {
    //printf("打开图之前[%s]\n", log_Time());
    // create image
    cv::Mat image;
    //std::cout << "size (empty picture): " << image.size().height << " , "<< image.size().width << std::endl;


    CvxText text("./simhei.ttf"); //指定字体
    cv::Scalar size1{ 40, 0.5, 0.1, 0 }; // (字体大小, 无效的, 字符间距, 无效的 }
    text.setFont(nullptr, &size1, nullptr, 0);

    vector<int> compression_params;
    compression_params.push_back(CV_IMWRITE_JPEG_QUALITY);  //选择jpeg
    compression_params.push_back(60); //在这个填入你要的图片质量

    printf("start[%s]\n", log_Time());
    for (int i=0;i<10000;i++)
    {
        // open image
        cv::Mat image;
        image = cv::imread("20211103182311_4.186817.jpg");
        if (!image.data) {
            printf("=========================\n");
            return 0;
        }
        //printf("打开图之后[%s]\n", log_Time());

        /*图片大小*/
        //std::cout << "size (after reading): " << image.size().height << " , "<< image.size().width << std::endl;

        //画框
        cv::rectangle( image,cv::Point( 155,693),cv::Point( 349,1073),cv::Scalar(0,0,255),3,1);

        //字母文字
        //cv::putText(image, "HELLO", cv::Point(160, 1065), CV_FONT_HERSHEY_COMPLEX, 1, cv::Scalar(0,0, 255), 2, 1);

        char* str = (char *)"WZH";
        wchar_t *w_str;
        ToWchar(str,w_str);
        text.putText(image, w_str, cv::Point(160, 1065), cv::Scalar(0, 0, 255));

        
        //cv::waitKey(0);
        //printf("绘制图之后[%s]\n", log_Time());   
        cv::imwrite("output.jpg", image,compression_params);
        if (i%1000 == 0)
            printf("第%d张图保存[%s]\n", i,log_Time());
    }

    printf("end[%s]\n", log_Time());
    return 0;
}

int main() {
    //printf("打开图之前[%s]\n", log_Time());
    // create image
    cv::Mat image;
    //std::cout << "size (empty picture): " << image.size().height << " , "<< image.size().width << std::endl;


    CvxText text("./simhei.ttf"); //指定字体
    cv::Scalar size1{ 40, 0.5, 0.1, 0 }; // (字体大小, 无效的, 字符间距, 无效的 }
    text.setFont(nullptr, &size1, nullptr, 0);

    vector<int> compression_params;
    compression_params.push_back(CV_IMWRITE_JPEG_QUALITY);  //选择jpeg
    compression_params.push_back(60); //在这个填入你要的图片质量

    printf("start[%s]\n", log_Time());
    pid_t pid = fork();
    if (pid < 0){
        printf("error\n");
        return 1;
    }
    else if (pid == 0){
        for (int i=1;i<=5000;i++)
        {
            // open image
            cv::Mat image;
            image = cv::imread("20211103182311_4.186817.jpg");
            if (!image.data) {
                return 0;
            }

            cv::rectangle( image,cv::Point( 155,693),cv::Point( 349,1073),cv::Scalar(0,0,255),3,1);
            char* str = (char *)"WZH";
            wchar_t *w_str;
            ToWchar(str,w_str);
            text.putText(image, w_str, cv::Point(160, 1065), cv::Scalar(0, 0, 255)); 
            cv::imwrite("output1.jpg", image,compression_params);
            if (i%1000 == 0 || i==5000)
                printf("[son] 第%d张图保存[%s]\n", i,log_Time());
        }
    }
    else
    {
        for (int i=1;i<=5000;i++)
        {
            // open image
            cv::Mat image;
            image = cv::imread("20211103182311_4.186818.jpg");
            if (!image.data) {
                return 0;
            }

            cv::rectangle( image,cv::Point( 155,693),cv::Point( 349,1073),cv::Scalar(0,0,255),3,1);
            char* str = (char *)"WZH";
            wchar_t *w_str;
            ToWchar(str,w_str);
            text.putText(image, w_str, cv::Point(160, 1065), cv::Scalar(0, 0, 255)); 
            cv::imwrite("output2.jpg", image,compression_params);
            if (i%1000 == 0 || i==5000)
                printf("[fat] 第%d张图保存[%s]\n", i,log_Time());
        }
    }

    printf("end[%s]\n", log_Time());
    return 0;
}

需要指定字体文件的路径，修改图片打开位置和文件保存位置。wmain为单进程程序，main为双进程逻辑，时间可以减半。