trying to do a blinking text cursor

Hi,

I'm using SDL2 as it looks like the most cross-platform UI library out
there.  I don't want a GUI toolkit.

I'm writing a very simple text editor and so far, the most challenging
thing has been showing a blinking cursor at the text insertion point.

I think I can work how an SDL timer works, but I can't work out how to
invert the colours of a SDL_Rect at the insertion point.  How would I
implement a function:

  int ColourInvert(SDL_Window*w, SDL_Renderer*rend, SDL_Rect area);

?

here's my pseudo-code for my editor (had to trim all the editor stuff out):

SDL_Renderer*re;SDL_Window*w;TTF_Font*font;
int drawline(char*s){
  SDL_Surface*su=SDL_RenderText_Shaded(font,s,a,b));
  SDL_Texture*tx=SDL_CreateTextureFromSurface,(re,su));
  SDL_RenderCopy(re,tx,0,&rect));
  SDL_DestroyTexture(tx);
  SDL_FreeSurface(su);
}
main(){
  SDL_Init(SDL_INIT_EVERYTHING);TTF_Init();
  w=SDL_CreateWindow(x,a,a,y,z,SDL_WINDOW_SHOWN);
  re=SDL_CreateRenderer(w,-1,SDL_RENDERER_ACCELERATED);
  SDL_SetRenderDrawColor(g.v,255,255,255,255);
  SDL_RenderClear(g.v);
  SDL_RenderPresent(g.v);
  //message loop
  //a keypress changes a line
  // for each line in lines{drawline(line)}
}

Thanks for all your work, guys,


Jack

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