576 lines
16 KiB
C
576 lines
16 KiB
C
/* xscreensaver, Copyright (c) 1992, 1995, 1997, 1998
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* Jamie Zawinski <jwz@jwz.org>
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation. No representations are made about the suitability of this
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* software for any purpose. It is provided "as is" without express or
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* implied warranty.
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*
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* And remember: X Windows is to graphics hacking as roman numerals are to
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* the square root of pi.
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*/
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/* This file contains simple code to open a window or draw on the root.
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The idea being that, when writing a graphics hack, you can just link
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with this .o to get all of the uninteresting junk out of the way.
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- create a procedure `screenhack(dpy, window)'
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- create a variable `char *progclass' which names this program's
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resource class.
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- create a variable `char defaults []' for the default resources, and
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null-terminate it.
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- create a variable `XrmOptionDescRec options[]' for the command-line,
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and null-terminate it.
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And that's it...
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*/
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#include <stdio.h>
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#include <X11/Intrinsic.h>
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#include <X11/IntrinsicP.h>
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#include <X11/CoreP.h>
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#include <X11/Shell.h>
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#include <X11/StringDefs.h>
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#include <X11/Xutil.h>
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#include <X11/keysym.h>
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#ifdef __sgi
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# include <X11/SGIScheme.h> /* for SgiUseSchemes() */
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#endif /* __sgi */
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#ifdef HAVE_XMU
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# ifndef VMS
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# include <X11/Xmu/Error.h>
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# else /* VMS */
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# include <Xmu/Error.h>
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# endif
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#else
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# include "xmu.h"
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#endif
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#include "screenhack.h"
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#include "version.h"
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#include "vroot.h"
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#ifndef isupper
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# define isupper(c) ((c) >= 'A' && (c) <= 'Z')
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#endif
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#ifndef _tolower
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# define _tolower(c) ((c) - 'A' + 'a')
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#endif
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char *progname;
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XrmDatabase db;
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XtAppContext app;
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Bool mono_p;
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static XrmOptionDescRec default_options [] = {
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{ "-root", ".root", XrmoptionNoArg, "True" },
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{ "-window", ".root", XrmoptionNoArg, "False" },
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{ "-mono", ".mono", XrmoptionNoArg, "True" },
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{ "-install", ".installColormap", XrmoptionNoArg, "True" },
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{ "-noinstall",".installColormap", XrmoptionNoArg, "False" },
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{ "-visual", ".visualID", XrmoptionSepArg, 0 },
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{ "-window-id", ".windowID", XrmoptionSepArg, 0 },
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{ 0, 0, 0, 0 }
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};
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static char *default_defaults[] = {
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".root: false",
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"*geometry: 100x200", /* this should be .geometry, but nooooo... */
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"*mono: false",
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"*installColormap: false",
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"*visualID: default",
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"*windowID: ",
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0
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};
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static XrmOptionDescRec *merged_options;
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static int merged_options_size;
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static char **merged_defaults;
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static void
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merge_options (void)
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{
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int def_opts_size, opts_size;
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int def_defaults_size, defaults_size;
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for (def_opts_size = 0; default_options[def_opts_size].option;
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def_opts_size++)
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;
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for (opts_size = 0; options[opts_size].option; opts_size++)
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;
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merged_options_size = def_opts_size + opts_size;
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merged_options = (XrmOptionDescRec *)
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malloc ((merged_options_size + 1) * sizeof(*default_options));
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memcpy (merged_options, default_options,
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(def_opts_size * sizeof(*default_options)));
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memcpy (merged_options + def_opts_size, options,
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((opts_size + 1) * sizeof(*default_options)));
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for (def_defaults_size = 0; default_defaults[def_defaults_size];
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def_defaults_size++)
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;
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for (defaults_size = 0; defaults[defaults_size]; defaults_size++)
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;
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merged_defaults = (char **)
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malloc ((def_defaults_size + defaults_size + 1) * sizeof (*defaults));;
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memcpy (merged_defaults, default_defaults,
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def_defaults_size * sizeof(*defaults));
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memcpy (merged_defaults + def_defaults_size, defaults,
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(defaults_size + 1) * sizeof(*defaults));
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/* This totally sucks. Xt should behave like this by default.
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If the string in `defaults' looks like ".foo", change that
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to "Progclass.foo".
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*/
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{
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char **s;
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for (s = merged_defaults; *s; s++)
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if (**s == '.')
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{
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const char *oldr = *s;
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char *newr = (char *) malloc(strlen(oldr) + strlen(progclass) + 3);
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strcpy (newr, progclass);
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strcat (newr, oldr);
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*s = newr;
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}
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}
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}
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/* Make the X errors print out the name of this program, so we have some
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clue which one has a bug when they die under the screensaver.
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*/
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static int
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screenhack_ehandler (Display *dpy, XErrorEvent *error)
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{
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fprintf (stderr, "\nX error in %s:\n", progname);
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if (XmuPrintDefaultErrorMessage (dpy, error, stderr))
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exit (-1);
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else
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fprintf (stderr, " (nonfatal.)\n");
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return 0;
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}
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static Bool
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MapNotify_event_p (Display *dpy, XEvent *event, XPointer window)
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{
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return (event->xany.type == MapNotify &&
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event->xvisibility.window == (Window) window);
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}
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#ifdef XLOCKMORE
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extern void pre_merge_options (void);
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#endif
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static Atom XA_WM_PROTOCOLS, XA_WM_DELETE_WINDOW;
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/* Dead-trivial event handling: exits if "q" or "ESC" are typed.
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Exit if the WM_PROTOCOLS WM_DELETE_WINDOW ClientMessage is received.
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*/
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void
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screenhack_handle_event (Display *dpy, XEvent *event)
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{
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switch (event->xany.type)
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{
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case KeyPress:
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{
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KeySym keysym;
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unsigned char c = 0;
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XLookupString (&event->xkey, &c, 1, &keysym, 0);
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if (c == 'q' ||
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c == 'Q' ||
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c == 3 || /* ^C */
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c == 27) /* ESC */
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exit (0);
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else if (! (keysym >= XK_Shift_L && keysym <= XK_Hyper_R))
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XBell (dpy, 0); /* beep for non-chord keys */
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fprintf(stderr, "KEY PRESSED: %c (%02x)\n", c, c);
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}
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break;
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case ResizeRequest:
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screen_resized(event->xresizerequest.width, event->xresizerequest.height);
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screen_redraw();
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fprintf(stderr, "WINDOW RESIZED to width %d height %d\n",
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event->xresizerequest.width, event->xresizerequest.height);
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break;
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default:
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fprintf(stderr, "EVENT: %d (see /usr/include/X11/X.h)\n",
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event->xany.type);
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break;
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case Expose:
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screen_redraw();
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fprintf(stderr, "EXPOSE: x: %d y: %d width: %d height: %d\n",
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event->xexpose.x, event->xexpose.y,
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event->xexpose.width, event->xexpose.height);
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break;
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case ButtonPress:
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fprintf(stderr, "BUTTON PRESSED\n");
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break;
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case ClientMessage:
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{
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if (event->xclient.message_type != XA_WM_PROTOCOLS)
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{
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char *s = XGetAtomName(dpy, event->xclient.message_type);
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if (!s) s = "(null)";
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fprintf (stderr, "%s: unknown ClientMessage %s received!\n",
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progname, s);
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}
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else if (event->xclient.data.l[0] != XA_WM_DELETE_WINDOW)
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{
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char *s1 = XGetAtomName(dpy, event->xclient.message_type);
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char *s2 = XGetAtomName(dpy, event->xclient.data.l[0]);
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if (!s1) s1 = "(null)";
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if (!s2) s2 = "(null)";
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fprintf (stderr, "%s: unknown ClientMessage %s[%s] received!\n",
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progname, s1, s2);
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}
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else
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{
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exit (0);
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}
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}
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break;
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}
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}
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void
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screenhack_handle_events (Display *dpy)
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{
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while (XPending (dpy))
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{
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XEvent event;
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XNextEvent (dpy, &event);
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screenhack_handle_event (dpy, &event);
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}
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}
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static Visual *
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pick_visual (Screen *screen)
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{
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#ifdef USE_GL
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/* If we're linking against GL (that is, this is the version of screenhack.o
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that the GL hacks will use, which is different from the one that the
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non-GL hacks will use) then try to pick the "best" visual by interrogating
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the GL library instead of by asking Xlib. GL knows better.
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*/
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Visual *v = 0;
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char *string = get_string_resource ("visualID", "VisualID");
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char *s;
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if (string)
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for (s = string; *s; s++)
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if (isupper (*s)) *s = _tolower (*s);
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if (!string || !*string ||
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!strcmp (string, "gl") ||
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!strcmp (string, "best") ||
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!strcmp (string, "color") ||
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!strcmp (string, "default"))
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v = get_gl_visual (screen); /* from ../utils/visual-gl.c */
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if (string)
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free (string);
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if (v)
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return v;
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#endif /* USE_GL */
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return get_visual_resource (screen, "visualID", "VisualID", False);
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}
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/* Notice when the user has requested a different visual or colormap
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on a pre-existing window (e.g., "-root -visual truecolor" or
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"-window-id 0x2c00001 -install") and complain, since when drawing
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on an existing window, we have no choice about these things.
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*/
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static void
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visual_warning (Screen *screen, Window window, Visual *visual, Colormap cmap,
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Bool window_p)
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{
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char *visual_string = get_string_resource ("visualID", "VisualID");
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Visual *desired_visual = pick_visual (screen);
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char win[100];
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char why[100];
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if (window == RootWindowOfScreen (screen))
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strcpy (win, "root window");
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else
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sprintf (win, "window 0x%x", (unsigned long) window);
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if (window_p)
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sprintf (why, "-window-id 0x%x", (unsigned long) window);
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else
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strcpy (why, "-root");
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if (visual_string && *visual_string)
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{
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char *s;
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for (s = visual_string; *s; s++)
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if (isupper (*s)) *s = _tolower (*s);
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if (!strcmp (visual_string, "default") ||
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!strcmp (visual_string, "default") ||
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!strcmp (visual_string, "best"))
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/* don't warn about these, just silently DWIM. */
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;
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else if (visual != desired_visual)
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{
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fprintf (stderr, "%s: ignoring `-visual %s' because of `%s'.\n",
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progname, visual_string, why);
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fprintf (stderr, "%s: using %s's visual 0x%x.\n",
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progname, win, XVisualIDFromVisual (visual));
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}
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free (visual_string);
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}
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if (visual == DefaultVisualOfScreen (screen) &&
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has_writable_cells (screen, visual) &&
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get_boolean_resource ("installColormap", "InstallColormap"))
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{
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fprintf (stderr, "%s: ignoring `-install' because of `%s'.\n",
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progname, why);
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fprintf (stderr, "%s: using %s's colormap 0x%x.\n",
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progname, win, (unsigned long) cmap);
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}
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}
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int
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main (int argc, char **argv)
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{
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Widget toplevel;
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Display *dpy;
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Window window;
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Screen *screen;
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Visual *visual;
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Colormap cmap;
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Bool root_p;
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Window on_window = 0;
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XEvent event;
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Boolean dont_clear /*, dont_map */;
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char version[255];
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#ifdef XLOCKMORE
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pre_merge_options ();
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#endif
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merge_options ();
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#ifdef __sgi
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/* We have to do this on SGI to prevent the background color from being
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overridden by the current desktop color scheme (we'd like our backgrounds
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to be black, thanks.) This should be the same as setting the
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"*useSchemes: none" resource, but it's not -- if that resource is
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present in the `default_defaults' above, it doesn't work, though it
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does work when passed as an -xrm arg on the command line. So screw it,
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turn them off from C instead.
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*/
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SgiUseSchemes ("none");
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#endif /* __sgi */
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toplevel = XtAppInitialize (&app, progclass, merged_options,
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merged_options_size, &argc, argv,
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merged_defaults, 0, 0);
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dpy = XtDisplay (toplevel);
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screen = XtScreen (toplevel);
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db = XtDatabase (dpy);
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XtGetApplicationNameAndClass (dpy, &progname, &progclass);
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/* half-assed way of avoiding buffer-overrun attacks. */
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if (strlen (progname) >= 100) progname[100] = 0;
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XSetErrorHandler (screenhack_ehandler);
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XA_WM_PROTOCOLS = XInternAtom (dpy, "WM_PROTOCOLS", False);
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XA_WM_DELETE_WINDOW = XInternAtom (dpy, "WM_DELETE_WINDOW", False);
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if (argc > 1)
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{
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const char *s;
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int i;
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int x = 18;
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int end = 78;
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Bool help_p = !strcmp(argv[1], "-help");
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fprintf (stderr, "%s\n", version);
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for (s = progclass; *s; s++) fprintf(stderr, " ");
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fprintf (stderr, " eXcellent GUI\n\n");
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if (!help_p)
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fprintf(stderr, "Unrecognised option: %s\n", argv[1]);
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fprintf (stderr, "Options include: ");
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for (i = 0; i < merged_options_size; i++)
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{
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char *sw = merged_options [i].option;
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Bool argp = (merged_options [i].argKind == XrmoptionSepArg);
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int size = strlen (sw) + (argp ? 6 : 0) + 2;
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if (x + size >= end)
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{
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fprintf (stderr, "\n\t\t ");
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x = 18;
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}
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x += size;
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fprintf (stderr, "%s", sw);
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if (argp) fprintf (stderr, " <arg>");
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if (i != merged_options_size - 1) fprintf (stderr, ", ");
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}
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fprintf (stderr, ".\n");
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exit (help_p ? 0 : 1);
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}
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dont_clear = get_boolean_resource ("dontClearRoot", "Boolean");
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/*dont_map = get_boolean_resource ("dontMapWindow", "Boolean"); */
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mono_p = get_boolean_resource ("mono", "Boolean");
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if (CellsOfScreen (DefaultScreenOfDisplay (dpy)) <= 2)
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mono_p = True;
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root_p = get_boolean_resource ("root", "Boolean");
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{
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char *s = get_string_resource ("windowID", "WindowID");
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if (s && *s)
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on_window = get_integer_resource ("windowID", "WindowID");
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if (s) free (s);
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}
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if (on_window)
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{
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XWindowAttributes xgwa;
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window = (Window) on_window;
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XtDestroyWidget (toplevel);
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XGetWindowAttributes (dpy, window, &xgwa);
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cmap = xgwa.colormap;
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visual = xgwa.visual;
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visual_warning (screen, window, visual, cmap, True);
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}
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else if (root_p)
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{
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XWindowAttributes xgwa;
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window = RootWindowOfScreen (XtScreen (toplevel));
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XtDestroyWidget (toplevel);
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XGetWindowAttributes (dpy, window, &xgwa);
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cmap = xgwa.colormap;
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visual = xgwa.visual;
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visual_warning (screen, window, visual, cmap, False);
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}
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else
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{
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Boolean def_visual_p;
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visual = pick_visual (screen);
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if (toplevel->core.width <= 0)
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toplevel->core.width = 600;
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if (toplevel->core.height <= 0)
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toplevel->core.height = 480;
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def_visual_p = (visual == DefaultVisualOfScreen (screen));
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if (!def_visual_p)
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{
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unsigned int bg, bd;
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Widget new;
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cmap = XCreateColormap (dpy, RootWindowOfScreen(screen),
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visual, AllocNone);
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bg = get_pixel_resource ("background", "Background", dpy, cmap);
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bd = get_pixel_resource ("borderColor", "Foreground", dpy, cmap);
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new = XtVaAppCreateShell (progname, progclass,
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topLevelShellWidgetClass, dpy,
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XtNmappedWhenManaged, False,
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XtNvisual, visual,
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XtNdepth, visual_depth (screen, visual),
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XtNwidth, toplevel->core.width,
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XtNheight, toplevel->core.height,
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XtNcolormap, cmap,
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XtNbackground, (Pixel) bg,
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XtNborderColor, (Pixel) bd,
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XtNinput, True, /* for WM_HINTS */
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0);
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XtDestroyWidget (toplevel);
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toplevel = new;
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XtRealizeWidget (toplevel);
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window = XtWindow (toplevel);
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}
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else
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{
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XtVaSetValues (toplevel,
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XtNmappedWhenManaged, False,
|
||
XtNinput, True, /* for WM_HINTS */
|
||
0);
|
||
XtRealizeWidget (toplevel);
|
||
window = XtWindow (toplevel);
|
||
|
||
if (get_boolean_resource ("installColormap", "InstallColormap"))
|
||
{
|
||
cmap = XCreateColormap (dpy, window,
|
||
DefaultVisualOfScreen (XtScreen (toplevel)),
|
||
AllocNone);
|
||
XSetWindowColormap (dpy, window, cmap);
|
||
}
|
||
else
|
||
{
|
||
cmap = DefaultColormap (dpy, DefaultScreen (dpy));
|
||
}
|
||
}
|
||
|
||
/*
|
||
if (dont_map)
|
||
{
|
||
XtVaSetValues (toplevel, XtNmappedWhenManaged, False, 0);
|
||
XtRealizeWidget (toplevel);
|
||
}
|
||
else
|
||
*/
|
||
{
|
||
XtPopup (toplevel, XtGrabNone);
|
||
}
|
||
|
||
XtVaSetValues(toplevel, XtNtitle, version, 0);
|
||
|
||
/* For screenhack_handle_events(): select KeyPress, and
|
||
announce that we accept WM_DELETE_WINDOW. */
|
||
{
|
||
XWindowAttributes xgwa;
|
||
XGetWindowAttributes (dpy, window, &xgwa);
|
||
XSelectInput (dpy, window,
|
||
xgwa.your_event_mask | KeyPressMask | ButtonPressMask | ResizeRedirectMask | ExposureMask);
|
||
XChangeProperty (dpy, window, XA_WM_PROTOCOLS, XA_ATOM, 32,
|
||
PropModeReplace,
|
||
(unsigned char *) &XA_WM_DELETE_WINDOW, 1);
|
||
}
|
||
}
|
||
|
||
if (!dont_clear)
|
||
{
|
||
XSetWindowBackground (dpy, window,
|
||
get_pixel_resource ("background", "Background",
|
||
dpy, cmap));
|
||
XClearWindow (dpy, window);
|
||
}
|
||
|
||
if (!root_p && !on_window)
|
||
/* wait for it to be mapped */
|
||
XIfEvent (dpy, &event, MapNotify_event_p, (XPointer) window);
|
||
|
||
XSync (dpy, False);
|
||
|
||
screenhack (dpy, window); /* doesn't return */
|
||
return 0;
|
||
}
|