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#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <X11/Xlib.h>
#include <X11/extensions/shape.h>
#include <X11/Xutil.h>
int scr_width, scr_height;
uint64_t x, y, width, height;
Window window;
#define MIN_WIDTH 10
#define MIN_HEIGHT 10
#define MAX_WIDTH (800 - MIN_WIDTH)
#define MAX_HEIGHT (800 - MIN_HEIGHT)
static uint32_t
reflect (uint64_t i, uint64_t size)
{
i = i % (size * 2);
if (i >= size)
i = size * 2 - i - 1;
return i;
}
#define OUTLINE_WIDTH 3
void
set_shape (Display *dpy, Window window, XRectangle *rect)
{
if (rect->width > OUTLINE_WIDTH * 2 &&
rect->height > OUTLINE_WIDTH * 2)
{
XRectangle xrect;
Region inner_xregion;
Region outer_xregion;
inner_xregion = XCreateRegion ();
outer_xregion = XCreateRegion ();
xrect.x = 0;
xrect.y = 0;
xrect.width = rect->width;
xrect.height = rect->height;
XUnionRectWithRegion (&xrect, outer_xregion, outer_xregion);
xrect.x += OUTLINE_WIDTH;
xrect.y += OUTLINE_WIDTH;
xrect.width -= OUTLINE_WIDTH * 2;
xrect.height -= OUTLINE_WIDTH * 2;
XUnionRectWithRegion (&xrect, inner_xregion, inner_xregion);
XSubtractRegion (outer_xregion, inner_xregion, outer_xregion);
XShapeCombineRegion (dpy, window,
ShapeBounding, 0, 0, outer_xregion, ShapeSet);
XDestroyRegion (outer_xregion);
XDestroyRegion (inner_xregion);
}
}
static void
update_window (Display *dpy)
{
uint32_t real_x, real_y, real_width, real_height;
XRectangle rect;
real_width = reflect (width, MAX_WIDTH) + MIN_WIDTH;
real_height = reflect (height, MAX_HEIGHT) + MIN_HEIGHT;
real_x = reflect (x, scr_width);
real_y = reflect (y, scr_height);
if (real_x + real_width >= scr_width)
real_x = scr_width - real_width;
if (real_y + real_height >= scr_height)
real_y = scr_height - real_height;
XMoveResizeWindow (dpy, window, real_x, real_y,
real_width, real_height);
rect.x = real_x;
rect.y = real_y;
rect.width = real_width;
rect.height = real_height;
set_shape (dpy, window, &rect);
x += rand () % 20;
width += rand () % 20;
y += rand () % 20;
height += rand () % 20;
XSync (dpy, False);
}
int
main ()
{
Display *dpy = XOpenDisplay (NULL);
XSetWindowAttributes attr;
attr.override_redirect = True;
attr.background_pixel = 0;
x = 10;
y = 10;
width = 400;
height = 400;
scr_width = DisplayWidth (dpy, 0);
scr_height = DisplayHeight (dpy, 0);
window = XCreateWindow (
dpy, DefaultRootWindow (dpy), x, y, width, height,
0, 0,
InputOutput, DefaultVisual (dpy, 0),
CWOverrideRedirect | CWBackPixel, &attr);
XMapWindow (dpy, window);
while (1)
{
update_window (dpy);
usleep (10000);
}
XSync (dpy, False);
sleep (10);
}
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