Don't blank, power off (or w/e) the screen while flash is playing in fullscreen

gistfile1.c

#include <stdlib.h>
#include <string.h>
#include <X11/Xlib.h>

#include <stdio.h>

#define WINDOW_PROPERTY(prop) XGetWindowProperty(dpy,\
    w,\
    XInternAtom(dpy, (prop), True),\
    0,\
    (~0L),\
    False,\
    AnyPropertyType,\
    &actual_type,\
    &actual_format,\
    &nitems,\
    &bytes,\
    &data)

Atom _NET_WM_STATE_FULLSCREEN;

#define IS_FIREFOX_FLASH() ((title && !strcmp(title, "plugin-container")) && \
  (instance && !strcmp(instance, "plugin-container")) && \
  (class && !strcmp(class, "Plugin-container")))
#define IS_CHROMIUM_FLASH() ((title && !strcmp(title, "exe")) && \
  (instance && !strcmp(instance, "exe")) && \
  (class && !strcmp(class, "Exe")))
#define IS_OPERA_FLASH() ((title && !strcmp(title, "operapluginwrapper-native")) && \
  (instance && !strcmp(instance, "operapluginwrapper-native")) && \
  (class && !strcmp(class, "Operapluginwrapper-native")))

int
is_state_ok(Atom *atoms,
    unsigned int len)
{
  unsigned int i;

  for (i = 0; i < len; ++i) {
    if (atoms[i] == _NET_WM_STATE_FULLSCREEN)
    {
      return 1;
    }
  }

  return 0;
}

int
is_full_above(Display *dpy, Window w)
{
  Atom actual_type;
  int actual_format;
  unsigned long nitems, bytes;
  unsigned char *data;

  if (WINDOW_PROPERTY("_NET_WM_STATE") != Success)
    return 0;

  if (!is_state_ok((Atom*)data, nitems))
  {
    XFree(data);
    return 0;
  } else { XFree(data); }

  return 1;
}

int
is_match(Display *dpy, Window w)
{
  Atom actual_type;
  int actual_format;
  unsigned long nitems, bytes;
  unsigned char *data;
  char *title, *instance = NULL, *class = NULL;
  int res;

  if (WINDOW_PROPERTY("_NET_WM_NAME") != Success)
    return 0;

  title = (char*)data; data = NULL;

  if (WINDOW_PROPERTY("WM_CLASS") != Success)
  {
    XFree(title);
    return 0;
  }

  if (nitems > 0)
    instance = (char*)data;
  if (nitems > 1)
    class = ((char*)(((unsigned int)data) + strlen((char *)data) + 1));

  res = IS_FIREFOX_FLASH() || IS_CHROMIUM_FLASH() || IS_OPERA_FLASH();

  XFree(title);
  XFree(data);

  return res;
}

int
main(void)
{
  Display *dpy;
  XEvent ev;
  Window flash_win = None, watching_win = None;

  if (!(dpy = XOpenDisplay(getenv("DISPLAY")))) return 1;
  XSelectInput(dpy, DefaultRootWindow(dpy), SubstructureNotifyMask);

  _NET_WM_STATE_FULLSCREEN = XInternAtom(dpy, "_NET_WM_STATE_FULLSCREEN", False);

  for (;;) {
    XNextEvent(dpy, &ev);

    if (ev.type == CreateNotify &&
        ev.xcreatewindow.window != None &&
        is_match(dpy, ev.xcreatewindow.window))
    {
      puts("OPEN");
      watching_win = ev.xcreatewindow.window;
    }
    else if (ev.type == ClientMessage &&
        flash_win == None &&
        ev.xclient.window != None &&
        ev.xclient.window == watching_win &&
        is_full_above(dpy, ev.xclient.window))
    {
      flash_win = watching_win; watching_win == None;
      puts("PROPERTY");
      system("xset s off");
      system("xset dpms 0 0 0");
    }
    else if (ev.type == DestroyNotify &&
        ev.xdestroywindow.window != None &&
        ev.xdestroywindow.window == flash_win)
    {
      puts("CLOSE");
      flash_win = None;
      system("xset s blank");
      system("xset s 600");
      system("xset dpms 1200 2400 4800");
    }
  }
}