c++ - GD: How to add the text string to the RGB24 buffer image? -

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i have rgb24 format stream. each buffer video frame. need add text each frame. problem don't know libgd has method add buffer background rgb24 raw. ideas how that?

void * addhello(void * prgb24raw) {     int black;     gdimageptr im;      im = gdimagecreatetruecolor(320,240);      // here should set background prgb24raw pointer      black =  gdimagecolorresolvealpha(im, 0, 0, 0, gdalphaopaque);     gdimagestringft (im, null, black, "arial", 12, 0, 2, 14, "hello");      // here should copy modified buffer prgb24raw pointer      gdimagedestroy (im);      return prgb24raw; }


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