Function ImgPrintf

jni/stasm/misc.cpp:652–679

}

void ImgPrintf(         // printf on image
    CImage&     img,    // io
    double      x,      // in
    double      y,      // in
    unsigned    color,  // in: rrggbb e.g. 0xff0000 is red
    double      size,   // in: relative font size, 1 is standard size
    const char* format, // in
                ...)    // in
{
    char s[SBIG];       // format format into s
    va_list args;
    va_start(args, format);
    VSPRINTF(s, format, args);
    va_end(args);

    CV_Assert(size > 0);
    double fontsize = size * MIN(img.cols, img.rows) / 1000.;
    if (fontsize < .3) // smaller than about .3 is not legible
        fontsize = .3;

    // make the letters thick enough to be seen on high pixel images,
    // but not too thick to be illegible.  The code below sorta works.

    int thickness = MAX(1, cvRound(img.rows > 1000? 2 * fontsize: fontsize));

    putText(img, s, cv::Point(cvRound(x), cvRound(y)),
            CV_FONT_HERSHEY_SIMPLEX, fontsize, ToCvColor(color), thickness);
}

static byte RgbToGray( // CIE conversion to gray using integer arithmetic
    const RGBV rgb)