1 /* xscreensaver, Copyright (c) 1992, 1995, 1997, 1998
2 * Jamie Zawinski <jwz@jwz.org>
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that
7 * copyright notice and this permission notice appear in supporting
8 * documentation. No representations are made about the suitability of this
9 * software for any purpose. It is provided "as is" without express or
12 * And remember: X Windows is to graphics hacking as roman numerals are to
13 * the square root of pi.
16 /* This file contains simple code to open a window or draw on the root.
17 The idea being that, when writing a graphics hack, you can just link
18 with this .o to get all of the uninteresting junk out of the way.
20 - create a procedure `screenhack(dpy, window)'
22 - create a variable `char *progclass' which names this program's
25 - create a variable `char defaults []' for the default resources, and
28 - create a variable `XrmOptionDescRec options[]' for the command-line,
29 and null-terminate it.
35 #include <X11/Intrinsic.h>
36 #include <X11/IntrinsicP.h>
37 #include <X11/CoreP.h>
38 #include <X11/Shell.h>
39 #include <X11/StringDefs.h>
40 #include <X11/Xutil.h>
41 #include <X11/keysym.h>
44 # include <X11/SGIScheme.h> /* for SgiUseSchemes() */
49 # include <X11/Xmu/Error.h>
51 # include <Xmu/Error.h>
56 #include "screenhack.h"
61 # define isupper(c) ((c) >= 'A' && (c) <= 'Z')
64 # define _tolower(c) ((c) - 'A' + 'a')
73 static XrmOptionDescRec default_options [] = {
74 { "-root", ".root", XrmoptionNoArg, "True" },
75 { "-window", ".root", XrmoptionNoArg, "False" },
76 { "-mono", ".mono", XrmoptionNoArg, "True" },
77 { "-install", ".installColormap", XrmoptionNoArg, "True" },
78 { "-noinstall",".installColormap", XrmoptionNoArg, "False" },
79 { "-visual", ".visualID", XrmoptionSepArg, 0 },
80 { "-window-id", ".windowID", XrmoptionSepArg, 0 },
84 static char *default_defaults[] = {
86 "*geometry: 600x480", /* this should be .geometry, but nooooo... */
88 "*installColormap: false",
94 static XrmOptionDescRec *merged_options;
95 static int merged_options_size;
96 static char **merged_defaults;
101 int def_opts_size, opts_size;
102 int def_defaults_size, defaults_size;
104 for (def_opts_size = 0; default_options[def_opts_size].option;
107 for (opts_size = 0; options[opts_size].option; opts_size++)
110 merged_options_size = def_opts_size + opts_size;
111 merged_options = (XrmOptionDescRec *)
112 malloc ((merged_options_size + 1) * sizeof(*default_options));
113 memcpy (merged_options, default_options,
114 (def_opts_size * sizeof(*default_options)));
115 memcpy (merged_options + def_opts_size, options,
116 ((opts_size + 1) * sizeof(*default_options)));
118 for (def_defaults_size = 0; default_defaults[def_defaults_size];
121 for (defaults_size = 0; defaults[defaults_size]; defaults_size++)
123 merged_defaults = (char **)
124 malloc ((def_defaults_size + defaults_size + 1) * sizeof (*defaults));;
125 memcpy (merged_defaults, default_defaults,
126 def_defaults_size * sizeof(*defaults));
127 memcpy (merged_defaults + def_defaults_size, defaults,
128 (defaults_size + 1) * sizeof(*defaults));
130 /* This totally sucks. Xt should behave like this by default.
131 If the string in `defaults' looks like ".foo", change that
136 for (s = merged_defaults; *s; s++)
139 const char *oldr = *s;
140 char *newr = (char *) malloc(strlen(oldr) + strlen(progclass) + 3);
141 strcpy (newr, progclass);
149 /* Make the X errors print out the name of this program, so we have some
150 clue which one has a bug when they die under the screensaver.
154 screenhack_ehandler (Display *dpy, XErrorEvent *error)
156 fprintf (stderr, "\nX error in %s:\n", progname);
157 if (XmuPrintDefaultErrorMessage (dpy, error, stderr))
160 fprintf (stderr, " (nonfatal.)\n");
165 MapNotify_event_p (Display *dpy, XEvent *event, XPointer window)
167 return (event->xany.type == MapNotify &&
168 event->xvisibility.window == (Window) window);
173 extern void pre_merge_options (void);
177 static Atom XA_WM_PROTOCOLS, XA_WM_DELETE_WINDOW;
179 /* Dead-trivial event handling: exits if "q" or "ESC" are typed.
180 Exit if the WM_PROTOCOLS WM_DELETE_WINDOW ClientMessage is received.
183 screenhack_handle_event (Display *dpy, XEvent *event)
185 switch (event->xany.type)
191 XLookupString (&event->xkey, &c, 1, &keysym, 0);
197 else if (! (keysym >= XK_Shift_L && keysym <= XK_Hyper_R))
198 XBell (dpy, 0); /* beep for non-chord keys */
206 if (event->xclient.message_type != XA_WM_PROTOCOLS)
208 char *s = XGetAtomName(dpy, event->xclient.message_type);
209 if (!s) s = "(null)";
210 fprintf (stderr, "%s: unknown ClientMessage %s received!\n",
213 else if (event->xclient.data.l[0] != XA_WM_DELETE_WINDOW)
215 char *s1 = XGetAtomName(dpy, event->xclient.message_type);
216 char *s2 = XGetAtomName(dpy, event->xclient.data.l[0]);
217 if (!s1) s1 = "(null)";
218 if (!s2) s2 = "(null)";
219 fprintf (stderr, "%s: unknown ClientMessage %s[%s] received!\n",
233 screenhack_handle_events (Display *dpy)
235 while (XPending (dpy))
238 XNextEvent (dpy, &event);
239 screenhack_handle_event (dpy, &event);
245 pick_visual (Screen *screen)
248 /* If we're linking against GL (that is, this is the version of screenhack.o
249 that the GL hacks will use, which is different from the one that the
250 non-GL hacks will use) then try to pick the "best" visual by interrogating
251 the GL library instead of by asking Xlib. GL knows better.
254 char *string = get_string_resource ("visualID", "VisualID");
258 for (s = string; *s; s++)
259 if (isupper (*s)) *s = _tolower (*s);
261 if (!string || !*string ||
262 !strcmp (string, "gl") ||
263 !strcmp (string, "best") ||
264 !strcmp (string, "color") ||
265 !strcmp (string, "default"))
266 v = get_gl_visual (screen); /* from ../utils/visual-gl.c */
274 return get_visual_resource (screen, "visualID", "VisualID", False);
278 /* Notice when the user has requested a different visual or colormap
279 on a pre-existing window (e.g., "-root -visual truecolor" or
280 "-window-id 0x2c00001 -install") and complain, since when drawing
281 on an existing window, we have no choice about these things.
284 visual_warning (Screen *screen, Window window, Visual *visual, Colormap cmap,
287 char *visual_string = get_string_resource ("visualID", "VisualID");
288 Visual *desired_visual = pick_visual (screen);
292 if (window == RootWindowOfScreen (screen))
293 strcpy (win, "root window");
295 sprintf (win, "window 0x%x", (unsigned long) window);
298 sprintf (why, "-window-id 0x%x", (unsigned long) window);
300 strcpy (why, "-root");
302 if (visual_string && *visual_string)
305 for (s = visual_string; *s; s++)
306 if (isupper (*s)) *s = _tolower (*s);
308 if (!strcmp (visual_string, "default") ||
309 !strcmp (visual_string, "default") ||
310 !strcmp (visual_string, "best"))
311 /* don't warn about these, just silently DWIM. */
313 else if (visual != desired_visual)
315 fprintf (stderr, "%s: ignoring `-visual %s' because of `%s'.\n",
316 progname, visual_string, why);
317 fprintf (stderr, "%s: using %s's visual 0x%x.\n",
318 progname, win, XVisualIDFromVisual (visual));
320 free (visual_string);
323 if (visual == DefaultVisualOfScreen (screen) &&
324 has_writable_cells (screen, visual) &&
325 get_boolean_resource ("installColormap", "InstallColormap"))
327 fprintf (stderr, "%s: ignoring `-install' because of `%s'.\n",
329 fprintf (stderr, "%s: using %s's colormap 0x%x.\n",
330 progname, win, (unsigned long) cmap);
334 if (!validate_gl_visual (stderr, screen, win, visual))
341 main (int argc, char **argv)
350 Window on_window = 0;
352 Boolean dont_clear /*, dont_map */;
356 pre_merge_options ();
361 /* We have to do this on SGI to prevent the background color from being
362 overridden by the current desktop color scheme (we'd like our backgrounds
363 to be black, thanks.) This should be the same as setting the
364 "*useSchemes: none" resource, but it's not -- if that resource is
365 present in the `default_defaults' above, it doesn't work, though it
366 does work when passed as an -xrm arg on the command line. So screw it,
367 turn them off from C instead.
369 SgiUseSchemes ("none");
372 toplevel = XtAppInitialize (&app, progclass, merged_options,
373 merged_options_size, &argc, argv,
374 merged_defaults, 0, 0);
375 dpy = XtDisplay (toplevel);
376 screen = XtScreen (toplevel);
377 db = XtDatabase (dpy);
379 XtGetApplicationNameAndClass (dpy, &progname, &progclass);
381 /* half-assed way of avoiding buffer-overrun attacks. */
382 if (strlen (progname) >= 100) progname[100] = 0;
384 XSetErrorHandler (screenhack_ehandler);
386 XA_WM_PROTOCOLS = XInternAtom (dpy, "WM_PROTOCOLS", False);
387 XA_WM_DELETE_WINDOW = XInternAtom (dpy, "WM_DELETE_WINDOW", False);
390 char *v = (char *) strdup(strchr(screensaver_id, ' '));
391 char *s1, *s2, *s3, *s4;
392 s1 = (char *) strchr(v, ' '); s1++;
393 s2 = (char *) strchr(s1, ' ');
394 s3 = (char *) strchr(v, '('); s3++;
395 s4 = (char *) strchr(s3, ')');
398 sprintf (version, "%s: from the XScreenSaver %s distribution (%s.)",
409 Bool help_p = !strcmp(argv[1], "-help");
410 fprintf (stderr, "%s\n", version);
411 for (s = progclass; *s; s++) fprintf(stderr, " ");
412 fprintf (stderr, " http://www.jwz.org/xscreensaver/\n\n");
415 fprintf(stderr, "Unrecognised option: %s\n", argv[1]);
416 fprintf (stderr, "Options include: ");
417 for (i = 0; i < merged_options_size; i++)
419 char *sw = merged_options [i].option;
420 Bool argp = (merged_options [i].argKind == XrmoptionSepArg);
421 int size = strlen (sw) + (argp ? 6 : 0) + 2;
424 fprintf (stderr, "\n\t\t ");
428 fprintf (stderr, "%s", sw);
429 if (argp) fprintf (stderr, " <arg>");
430 if (i != merged_options_size - 1) fprintf (stderr, ", ");
432 fprintf (stderr, ".\n");
433 exit (help_p ? 0 : 1);
436 dont_clear = get_boolean_resource ("dontClearRoot", "Boolean");
437 /*dont_map = get_boolean_resource ("dontMapWindow", "Boolean"); */
438 mono_p = get_boolean_resource ("mono", "Boolean");
439 if (CellsOfScreen (DefaultScreenOfDisplay (dpy)) <= 2)
442 root_p = get_boolean_resource ("root", "Boolean");
445 char *s = get_string_resource ("windowID", "WindowID");
447 on_window = get_integer_resource ("windowID", "WindowID");
453 XWindowAttributes xgwa;
454 window = (Window) on_window;
455 XtDestroyWidget (toplevel);
456 XGetWindowAttributes (dpy, window, &xgwa);
457 cmap = xgwa.colormap;
458 visual = xgwa.visual;
459 visual_warning (screen, window, visual, cmap, True);
463 XWindowAttributes xgwa;
464 window = RootWindowOfScreen (XtScreen (toplevel));
465 XtDestroyWidget (toplevel);
466 XGetWindowAttributes (dpy, window, &xgwa);
467 cmap = xgwa.colormap;
468 visual = xgwa.visual;
469 visual_warning (screen, window, visual, cmap, False);
473 Boolean def_visual_p;
474 visual = pick_visual (screen);
477 if (!validate_gl_visual (stderr, screen, "window", visual))
481 if (toplevel->core.width <= 0)
482 toplevel->core.width = 600;
483 if (toplevel->core.height <= 0)
484 toplevel->core.height = 480;
486 def_visual_p = (visual == DefaultVisualOfScreen (screen));
493 cmap = XCreateColormap (dpy, RootWindowOfScreen(screen),
495 bg = get_pixel_resource ("background", "Background", dpy, cmap);
496 bd = get_pixel_resource ("borderColor", "Foreground", dpy, cmap);
498 new = XtVaAppCreateShell (progname, progclass,
499 topLevelShellWidgetClass, dpy,
500 XtNmappedWhenManaged, False,
502 XtNdepth, visual_depth (screen, visual),
503 XtNwidth, toplevel->core.width,
504 XtNheight, toplevel->core.height,
506 XtNbackground, (Pixel) bg,
507 XtNborderColor, (Pixel) bd,
508 XtNinput, True, /* for WM_HINTS */
510 XtDestroyWidget (toplevel);
512 XtRealizeWidget (toplevel);
513 window = XtWindow (toplevel);
517 XtVaSetValues (toplevel,
518 XtNmappedWhenManaged, False,
519 XtNinput, True, /* for WM_HINTS */
521 XtRealizeWidget (toplevel);
522 window = XtWindow (toplevel);
524 if (get_boolean_resource ("installColormap", "InstallColormap"))
526 cmap = XCreateColormap (dpy, window,
527 DefaultVisualOfScreen (XtScreen (toplevel)),
529 XSetWindowColormap (dpy, window, cmap);
533 cmap = DefaultColormap (dpy, DefaultScreen (dpy));
540 XtVaSetValues (toplevel, XtNmappedWhenManaged, False, 0);
541 XtRealizeWidget (toplevel);
546 XtPopup (toplevel, XtGrabNone);
549 XtVaSetValues(toplevel, XtNtitle, version, 0);
551 /* For screenhack_handle_events(): select KeyPress, and
552 announce that we accept WM_DELETE_WINDOW. */
554 XWindowAttributes xgwa;
555 XGetWindowAttributes (dpy, window, &xgwa);
556 XSelectInput (dpy, window,
557 xgwa.your_event_mask | KeyPressMask | ButtonPressMask);
558 XChangeProperty (dpy, window, XA_WM_PROTOCOLS, XA_ATOM, 32,
560 (unsigned char *) &XA_WM_DELETE_WINDOW, 1);
566 XSetWindowBackground (dpy, window,
567 get_pixel_resource ("background", "Background",
569 XClearWindow (dpy, window);
572 if (!root_p && !on_window)
573 /* wait for it to be mapped */
574 XIfEvent (dpy, &event, MapNotify_event_p, (XPointer) window);
578 /* This is the one and only place that the random-number generator is
579 seeded in any screenhack. You do not need to seed the RNG again,
580 it is done for you before your code is invoked. */
584 screenhack (dpy, window); /* doesn't return */