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b4light.c

/*
 * $XConsortium: b4light.c,v 1.3 94/04/17 20:59:38 rws Exp $
 *
Copyright (c) 1992  X Consortium

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the X Consortium.
 *
 * Author:  Keith Packard, MIT X Consortium
 */
/* $XFree86: xc/programs/beforelight/b4light.c,v 3.6tsi Exp $ */

#include <X11/Xatom.h>
#include <X11/Intrinsic.h>
#include <X11/StringDefs.h>
#include <X11/Shell.h>
#include <X11/Xaw/Label.h>
#include <X11/Xaw/Cardinals.h>
#include <X11/extensions/scrnsaver.h>
#include <X11/Xcms.h>
#include <stdlib.h>
#include <time.h>

#ifdef NOTDEF
static void quit (Widget w, XEvent *event, 
              String *params, Cardinal *num_params);

static XtActionsRec beforedark_actions[] = {
    { "quit",     quit },
};

static Atom wm_delete_window;
#endif

static int  ss_event, ss_error;

static Display *display;
static Window  root, saver;
static int screen;
static int  scr_wid, scr_hei;
static Colormap   cmap;
static GC gc, black_gc, erase_gc;
static int  screen_saved;
static XtAppContext app_con;
static GC   bit_1_gc, bit_0_gc;
static Bool filled = False;

#define MAX_POINTS  16

00068 typedef  struct _moving {
    int  x, y, dx, dy;
} Moving;

static Moving     p[MAX_POINTS];

#define NUM_HISTORY 32

static XPoint     history[NUM_HISTORY][MAX_POINTS];
static Pixmap     old_pixmaps[NUM_HISTORY];
static unsigned long    old_pixels[NUM_HISTORY];
static int  num_points = 3;
static int  history_head, history_tail;
#define hist_bump(h)    ((++(h) == NUM_HISTORY) ? ((h) = 0) : 0)

#define NUM_COLORS  64

static unsigned long    black_pixel;
static unsigned long    pixels[NUM_COLORS];
static int  cur_pen = 0;

static void
AllocateColors (void)
{
    double  angle;
    double  step;
    XcmsColor     cms_color;
    int           i;
    XColor  hard, exact;

    XAllocNamedColor (display, cmap, "black", &hard, &exact);
    black_pixel = hard.pixel;
    step = 360.0 / NUM_COLORS;
    for (i = 0; i < NUM_COLORS; i++) {
      angle = i * step;
      cms_color.spec.TekHVC.H = angle;
      cms_color.spec.TekHVC.V = 75.0;
      cms_color.spec.TekHVC.C = 75.0;
      cms_color.format = XcmsTekHVCFormat;
      XcmsAllocColor (display, cmap, &cms_color, XcmsRGBFormat);
      pixels[i] = cms_color.pixel;
    }
}


static void
StepPen (void)
{
    XSetForeground (display, gc, pixels[cur_pen]);
    cur_pen++;
    if (cur_pen == NUM_COLORS)
      cur_pen = 0;
}

static void
DrawPoints (Drawable draw, GC gc, XPoint *p, int n)
{
    XPoint  xp[MAX_POINTS + 1];
    int         i;

    switch (n) {
    case 1:
      XDrawPoint (display, draw, gc, p->x, p->y);
      break;
    case 2:
      XDrawLine (display, draw, gc, p[0].x, p[0].y, p[1].x, p[1].y);
      break;
    default:
      for (i = 0; i < n; i++) {
          xp[i].x = p[i].x; xp[i].y = p[i].y;
      }
      xp[i].x = p[0].x; xp[i].y = p[0].y;
      if (filled)
          XFillPolygon (display, draw, gc, xp, i+1, Complex, CoordModeOrigin);
      else
          XDrawLines (display, draw, gc, xp, i + 1, CoordModeOrigin);
    }
}

static void
Draw (Moving *p, int n)
{
    XPoint  xp[MAX_POINTS];
    int         i;
    for (i = 0; i < n; i++) 
    {
      xp[i].x = p[i].x; xp[i].y = p[i].y;
    }
    old_pixels[history_head] = pixels[cur_pen];
    StepPen ();
    DrawPoints (saver, gc, xp, n);
    if (filled)
    {
      XFillRectangle (display, old_pixmaps[history_head], bit_0_gc,
                  0, 0, scr_wid, scr_hei);
      DrawPoints (old_pixmaps[history_head], bit_1_gc, xp, n);
      for (i = history_tail; i != history_head; hist_bump(i))
          DrawPoints (old_pixmaps[i], bit_0_gc, xp, n);
    }
}

static void
Erase (XPoint *p, int n)
{
    if (filled) {
      XSetForeground (display, erase_gc, black_pixel ^ old_pixels[history_tail]);
      XCopyPlane (display, old_pixmaps[history_tail], saver, erase_gc,
                0, 0, scr_wid, scr_hei, 0, 0, 1);
    }
    else
      DrawPoints (saver, black_gc, p, n);
}

#define STEP_MAX    32

static int
RandomStep (void)
{
    return (rand () % STEP_MAX) + 1;
}

static void
StepMoving (Moving *m)
{
    int     maxx, maxy;

    maxx = DisplayWidth (display, screen);
    maxy = DisplayHeight (display, screen);
    m->x += m->dx;
    if (m->x <= 0) {
      m->x = 0;
      m->dx = RandomStep ();
    }
    if (m->x >= maxx) {
      m->x = maxx - 1;
      m->dx = -RandomStep ();
    }
    m->y += m->dy;
    if (m->y <= 0) {
      m->y = 0;
      m->dy = RandomStep ();
    }
    if (m->y >= maxy) {
      m->y = maxy - 1;
      m->dy = -RandomStep ();
    }
}

static void
StepPoints (void)
{
    int     i;

    for (i = 0; i < num_points; i++)
      StepMoving (&p[i]);
    hist_bump(history_head);
    if (history_tail == history_head)
    {
      Erase (history[history_tail], num_points);
      hist_bump(history_tail);
    }
    Draw (p, num_points);
    for (i = 0; i < num_points; i++)
    {
      history[history_head][i].x = p[i].x;
      history[history_head][i].y = p[i].y;
    }
}

static void
StartPoints (void)
{
    history_head = history_tail = 0;
}

static void
Timeout (XtPointer closure, XtIntervalId *id)
{
    if (screen_saved)
    {
      StepPoints ();
      (void) XtAppAddTimeOut (app_con, 50, Timeout, NULL);
    }
}

static void 
StartSaver (void)
{
    if (screen_saved)
      return;
    screen_saved = True;
    StartPoints ();
    StepPoints ();
    (void) XtAppAddTimeOut (app_con, 50, Timeout, NULL);
}

static void
StopSaver (void)
{
    if (!screen_saved)
      return;
    screen_saved = False;
}

static int 
ignoreError (Display *display, XErrorEvent *error)
{
    return 0;
}

int 
main(int argc, char *argv[])
{
    Widget toplevel;
    XEvent  event;
    XScreenSaverNotifyEvent *sevent;
    XSetWindowAttributes    attr;
    XScreenSaverInfo        *info;
    unsigned long     mask;
    Pixmap            blank_pix;
    XColor            dummyColor;
    XID                     kill_id;
    Atom              kill_type;
    int                     i;
    int                     (*oldHandler)();
    Window            r;
    int                     x, y;
    unsigned int      w, h, b, d;
    Status            s;

#if !defined(X_NOT_POSIX)
    srand((int)time((time_t *)NULL));
#else
    srand((int)time((int *)NULL));
#endif

    toplevel = XtAppInitialize (&app_con, "Beforelight", NULL, ZERO,
                        &argc, argv, NULL, NULL, ZERO);
    display = XtDisplay (toplevel);
    root = DefaultRootWindow (display);
    screen = DefaultScreen (display);
    scr_wid = DisplayWidth (display, screen);
    scr_hei = DisplayHeight (display, screen);
    if (!XScreenSaverQueryExtension (display, &ss_event, &ss_error))
      exit (1);
#ifdef NOTDEF
    XtAppAddActions (app_con, beforedark_actions, XtNumber(beforedark_actions));

    /*
     * This is a hack so that f.delete will do something useful in this
     * single-window application.
     */
    XtOverrideTranslations(toplevel, 
                XtParseTranslationTable ("<Message>WM_PROTOCOLS: quit()"));

    XtCreateManagedWidget ("label", labelWidgetClass, toplevel, NULL, ZERO);
    XtRealizeWidget (toplevel);
    wm_delete_window = XInternAtom (XtDisplay(toplevel), "WM_DELETE_WINDOW",
                            False);
    (void) XSetWMProtocols (XtDisplay(toplevel), XtWindow(toplevel),
                      &wm_delete_window, 1);
    
#endif
    oldHandler = XSetErrorHandler (ignoreError);
    if (XScreenSaverGetRegistered (display, screen, &kill_id, &kill_type)) {
      s = XGetGeometry(display, kill_id, &r, &x, &y, &w, &h, &b, &d);
      if (s == True && r == root && w == 1 && h == 1 && d == 1) {
          /* Try to clean up existing saver & resources */
          XKillClient (display, kill_id);
          XScreenSaverUnregister(display, screen);
      }
    }
    XSync(display, FALSE);
    XSetErrorHandler(oldHandler);
    XScreenSaverSelectInput (display, root, ScreenSaverNotifyMask);
#ifdef NOTDEF
    cmap = XCreateColormap (display, root, DefaultVisual (display, screen), AllocNone);
#else
    cmap = DefaultColormap (display, screen);
#endif
    AllocateColors();
    blank_pix = XCreatePixmap (display, root, 1, 1, 1);
    XScreenSaverRegister (display, screen, (XID) blank_pix, XA_PIXMAP);
    bit_0_gc = XCreateGC (display, blank_pix, 0, 0);
    XSetForeground (display, bit_0_gc, 0);
    bit_1_gc = XCreateGC (display, blank_pix, 0, 0);
    XSetForeground (display, bit_1_gc, ~0);
    XFillRectangle (display, blank_pix, bit_0_gc, 0, 0, 1, 1);
    info = XScreenSaverAllocInfo ();
    XScreenSaverQueryInfo (display, root, info);
    mask = 0;
    attr.colormap = cmap;
    mask |= CWColormap;
    attr.background_pixel = black_pixel;
    mask |= CWBackPixel;
    attr.cursor = XCreatePixmapCursor (display, blank_pix, blank_pix, &dummyColor, &dummyColor, 0, 0);
    mask |= CWCursor;
    XScreenSaverSetAttributes (display, root, 0, 0,
      DisplayWidth (display, screen), DisplayHeight(display, screen), 0,
      CopyFromParent, CopyFromParent, CopyFromParent, mask, &attr);
    XSync (display, False);
    gc = XCreateGC (display, root, 0, 0);
    black_gc = XCreateGC (display, root, 0, 0);
    XSetForeground (display, black_gc, black_pixel);
    if (filled)
    {
      erase_gc = XCreateGC (display, root, 0, 0);
      XSetBackground (display, erase_gc, 0);
      XSetFunction (display, erase_gc, GXxor);
      XSetGraphicsExposures (display, erase_gc, False);
      for (i = 0; i < NUM_HISTORY; i++)
          old_pixmaps[i] = XCreatePixmap (display, root, scr_wid, scr_hei, 1);
    }
    XSetErrorHandler (ignoreError);
    saver = info->window;
    if (info->state == ScreenSaverOn)
    {
      if (info->kind != ScreenSaverExternal) 
      {
          XResetScreenSaver (display);
          XActivateScreenSaver (display);
      }
      StartSaver ();
    }
    for (;;) 
    {
      XtAppNextEvent (app_con, &event);
      if (event.type == ss_event) {
          sevent = (XScreenSaverNotifyEvent *) &event;
          if (sevent->state == ScreenSaverOn) {
            if (sevent->kind != ScreenSaverExternal) {
                XResetScreenSaver (display);
                XActivateScreenSaver (display);
            } else {
                StartSaver ();
            }
          } else if (sevent->state == ScreenSaverOff) {
            StopSaver ();
          }
      } else {
          XtDispatchEvent(&event);
      }
    }
}

#ifdef NOTDEF
static void 
quit (Widget w, XEvent *event, String *params, Cardinal *num_params)
{
    if (event->type == ClientMessage &&
      event->xclient.data.l[0] != wm_delete_window) {
      XBell (XtDisplay(w), 0);
      return;
    }
    XCloseDisplay (XtDisplay(w));
    exit (0);
}
#endif

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