x11-xserver-utils/beforelight/b4light.c

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/*
* $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
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