OpenCV实现图像上添加汉字 转

<span style="font-size:18px;">void GetStringSize(HDC hDC, const char* str, int* w, int* h)
{
    SIZE size;
    GetTextExtentPoint32A(hDC, str, strlen(str), &size);
    if(w != ) *w = size.cx;
    if(h != ) *h = size.cy;
}

void paDrawString(Mat& dst, const char* str, Point org, Scalar color, int fontSize, bool italic, bool underline)
{
    CV_Assert(dst.data !=  && (dst.channels() ==  || dst.channels() == ));

    int x, y, r, b;
    if(org.x > dst.cols || org.y > dst.rows) return;
    x = org.x <  ? -org.x : ;
    y = org.y <  ? -org.y : ;

    LOGFONTA lf;
    lf.lfHeight         = - fontSize ;
    lf.lfWidth          =  ;
    lf.lfEscapement     =  ;
    lf.lfOrientation    =  ;
    lf.lfWeight         = ;
    lf.lfItalic         = italic ;    //斜体
    lf.lfUnderline      = underline ;    //下划线
    lf.lfStrikeOut       =  ;
    lf.lfCharSet        = DEFAULT_CHARSET ;
    lf.lfOutPrecision    =  ;
    lf.lfClipPrecision    =  ;
    lf.lfQuality         = PROOF_QUALITY ;
    lf.lfPitchAndFamily  =  ;
    strcpy (lf.lfFaceName, "华文行楷" );

    HFONT hf = CreateFontIndirectA(&lf);
    HDC hDC = CreateCompatibleDC();
    HFONT hOldFont = (HFONT)SelectObject(hDC, hf);

    int strBaseW = , strBaseH = ;
    int singleRow = ;
    char buf[ << ];
    strcpy(buf, str);

    //处理多行
    {
        int nnh = ;
        int cw, ch;
        const char* ln = strtok(buf, "\n");
        while(ln != )
        {
            GetStringSize(hDC, ln, &cw, &ch);
            strBaseW = max(strBaseW, cw);
            strBaseH = max(strBaseH, ch);

            ln = strtok(, "\n");
            nnh++;
        }
        singleRow = strBaseH;
        strBaseH *= nnh;
    }

    if(org.x + strBaseW <  || org.y + strBaseH < )
    {
        SelectObject(hDC, hOldFont);
        DeleteObject(hf);
        DeleteObject(hDC);
        return;
    }

    r = org.x + strBaseW > dst.cols? dst.cols - org.x -  : strBaseW - ;
    b = org.y + strBaseH > dst.rows ? dst.rows - org.y -  : strBaseH - ;
    org.x = org.x <  ?  : org.x;
    org.y = org.y <  ?  : org.y;

    BITMAPINFO bmp = {};
    BITMAPINFOHEADER& bih = bmp.bmiHeader;
    int strDrawLineStep = strBaseW *  %  ==  ? strBaseW *  : (strBaseW *  +  - ((strBaseW * ) % ));

    bih.biSize=sizeof(BITMAPINFOHEADER);
    bih.biWidth=strBaseW;
    bih.biHeight=strBaseH;
    bih.biPlanes=;
    bih.biBitCount=;
    bih.biCompression=BI_RGB;
    bih.biSizeImage=strBaseH * strDrawLineStep;
    bih.biClrUsed=;
    bih.biClrImportant=;

    void* pDibData = ;
    HBITMAP hBmp = CreateDIBSection(hDC, &bmp, DIB_RGB_COLORS, &pDibData, , );

    CV_Assert(pDibData != );
    HBITMAP hOldBmp = (HBITMAP)SelectObject(hDC, hBmp);

    //color.val[2], color.val[1], color.val[0]
    SetTextColor(hDC, RGB(, , ));
    SetBkColor(hDC, );
    //SetStretchBltMode(hDC, COLORONCOLOR);

    strcpy(buf, str);
    const char* ln = strtok(buf, "\n");
    int outTextY = ;
    while(ln != )
    {
        TextOutA(hDC, , outTextY, ln, strlen(ln));
        outTextY += singleRow;
        ln = strtok(, "\n");
    }
    uchar* dstData = (uchar*)dst.data;
    int dstStep = dst.step/sizeof(dstData[]);
    unsigned char* pImg = (unsigned char*)dst.data + org.x * dst.channels() + org.y * dstStep;
    unsigned char* pStr = (unsigned char*)pDibData + x * ;
    for(int tty = y; tty <= b; ++tty)
    {
        unsigned char* subImg = pImg + (tty - y) * dstStep;
        unsigned char* subStr = pStr + (strBaseH - tty - ) * strDrawLineStep;
        for (int ttx = x; ttx <= r; ++ttx)
        {
            for (int n = ; n < dst.channels(); ++n){
                double vtxt = subStr[n] / 255.0;
                int cvv =  vtxt * color.val[n] + ( - vtxt) * subImg[n];
                subImg[n] = cvv >  ?  : (cvv <  ?  : cvv);
            }

            subStr += ;
            subImg += dst.channels();
        }
    }

    SelectObject(hDC, hOldBmp);
    SelectObject(hDC, hOldFont);
    DeleteObject(hf);
    DeleteObject(hBmp);
    DeleteDC(hDC);
}

主函数

void main()
{
    Mat img = imread("cat.jpg");
    if(!img.data)
    {
        cout<<"load image error"<<endl;
        return;
    }
    paDrawString(img, "测试汉字哈...\n换行了哟\n真的可以啊！！！~",Point(, ), Scalar(,,), , true, true);
    imshow("img", img);
    waitKey();
}