#include <X11/Xlib.h>
#include <stdio.h>

#include "xutil.h"

/**
 * move a window outline
 *
 *  \param root         window we are outlining
 *  \param x,y          upper left coordinate
 *  \param width,height size of the rectangle
 *  \param bw           border width of the frame
 *  \param th           title height
 */
void
MoveOutline(Display *dpy, Window root, GC gc, int x, int y, int width, int height, int bw, int th)
{
        static int      lastx = 0;
        static int      lasty = 0;
        static int      lastWidth = 0;
        static int      lastHeight = 0;
        static int      lastBW = 0;
        static int      lastTH = 0;
        int             xl, xr, yt, yb, xinnerl, xinnerr, yinnert, yinnerb;
        int             xthird, ythird;
        XSegment        outline[18];
        register XSegment       *r;
        if (x == lastx && y == lasty && width == lastWidth && height == lastHeight
            && lastBW == bw && th == lastTH)
                return;
        r = outline;
#define DRAWIT() \
        if (lastWidth || lastHeight)                    \
        {                                                       \
                xl = lastx;                                     \
                xr = lastx + lastWidth - 1;                     \
                yt = lasty;                                     \
                yb = lasty + lastHeight - 1;                    \
                xinnerl = xl + lastBW;                          \
                xinnerr = xr - lastBW;                          \
                yinnert = yt + lastTH + lastBW;                 \
                yinnerb = yb - lastBW;                          \
                xthird = (xinnerr - xinnerl) / 3;               \
                ythird = (yinnerb - yinnert) / 3;               \
                \
                r->x1 = xl;                                     \
                r->y1 = yt;                                     \
                r->x2 = xr;                                     \
                r->y2 = yt;                                     \
                r++;                                            \
                \
                r->x1 = xl;                                     \
                r->y1 = yb;                                     \
                r->x2 = xr;                                     \
                r->y2 = yb;                                     \
                r++;                                            \
                \
                r->x1 = xl;                                     \
                r->y1 = yt;                                     \
                r->x2 = xl;                                     \
                r->y2 = yb;                                     \
                r++;                                            \
                \
                r->x1 = xr;                                     \
                r->y1 = yt;                                     \
                r->x2 = xr;                                     \
                r->y2 = yb;                                     \
                r++;                                            \
                \
                r->x1 = xinnerl + xthird;                       \
                r->y1 = yinnert;                                \
                r->x2 = r->x1;                                  \
                r->y2 = yinnerb;                                \
                r++;                                            \
                \
                r->x1 = xinnerl + (2 * xthird);                 \
                r->y1 = yinnert;                                \
                r->x2 = r->x1;                                  \
                r->y2 = yinnerb;                                \
                r++;                                            \
                \
                r->x1 = xinnerl;                                \
                r->y1 = yinnert + ythird;                       \
                r->x2 = xinnerr;                                \
                r->y2 = r->y1;                                  \
                r++;                                            \
                \
                r->x1 = xinnerl;                                \
                r->y1 = yinnert + (2 * ythird);                 \
                r->x2 = xinnerr;                                \
                r->y2 = r->y1;                                  \
                r++;                                            \
                \
                if (lastTH != 0) {                              \
                        r->x1 = xl;                             \
                        r->y1 = yt + lastTH;                    \
                        r->x2 = xr;                             \
                        r->y2 = r->y1;                          \
                        r++;                                    \
                }                                               \
        }
        /* undraw the old one, if any */
        DRAWIT();
        lastx = x;
        lasty = y;
        lastWidth = width;
        lastHeight = height;
        lastBW = bw;
        lastTH = th;
        /* draw the new one, if any */
        DRAWIT();
#undef DRAWIT
        if (r != outline) {
                XDrawSegments(dpy, root, gc, outline, r - outline);
        }
}