1 /* -*- Mode: C; tab-width: 4 -*- */
2 /* slip --- lots of slipping blits */
5 static const char sccsid[] = "@(#)slip.c 5.00 2000/11/01 xlockmore";
9 * Copyright (c) 1992 by Scott Draves <spot@cs.cmu.edu>
11 * Permission to use, copy, modify, and distribute this software and its
12 * documentation for any purpose and without fee is hereby granted,
13 * provided that the above copyright notice appear in all copies and that
14 * both that copyright notice and this permission notice appear in
15 * supporting documentation.
17 * This file is provided AS IS with no warranties of any kind. The author
18 * shall have no liability with respect to the infringement of copyrights,
19 * trade secrets or any patents by this file or any part thereof. In no
20 * event will the author be liable for any lost revenue or profits or
21 * other special, indirect and consequential damages.
23 * 01-Nov-2000: Allocation checks
24 * 10-May-1997: Jamie Zawinski <jwz@jwz.org> compatible with xscreensaver
25 * 01-Dec-1995: Patched for VMS <joukj@hrem.stm.tudelft.nl>
30 # define DEFAULTS "*delay: 50000 \n" \
34 "*fpsSolid: true \n" \
35 "*ignoreRotation: True \n" \
38 # define release_slip 0
39 # include "xlockmore.h" /* in xscreensaver distribution */
40 #else /* STANDALONE */
41 # include "xlock.h" /* in xlockmore distribution */
42 #endif /* STANDALONE */
46 ENTRYPOINT ModeSpecOpt slip_opts =
47 {0, (XrmOptionDescRec *) NULL, 0, (argtype *) NULL, (OptionStruct *) NULL};
50 ModStruct slip_description =
51 {"slip", "init_slip", "draw_slip", (char *) NULL,
52 "init_slip", "init_slip", (char *) NULL, &slip_opts,
53 50000, 35, 50, 1, 64, 1.0, "",
54 "Shows slipping blits", 0, NULL};
61 int blit_width, blit_height;
70 static slipstruct *slips = (slipstruct *) NULL;
73 halfrandom(slipstruct *sp, int mv)
82 sp->lasthalf = (short) (r >> 16);
88 erandom(slipstruct *sp, int mv)
96 res = (int) (sp->r & 0xf);
107 image_loaded_cb (Screen *screen, Window w, Drawable d,
108 const char *name, XRectangle *geom,
111 ModeInfo *mi = (ModeInfo *) closure;
112 slipstruct *sp = &slips[MI_SCREEN(mi)];
113 Display *dpy = DisplayOfScreen (screen);
114 XCopyArea (dpy, d, w, mi->gc, 0, 0,
115 sp->width, sp->height, 0, 0);
116 XFreePixmap (dpy, d);
117 sp->image_loading_p = False;
119 #endif /* STANDALONE */
122 prepare_screen(ModeInfo * mi, slipstruct * sp)
125 Display *display = MI_DISPLAY(mi);
127 int i, n, w = sp->width / 20;
128 int not_solid = halfrandom(sp, 10);
130 sp->backwards = (int) (LRAND() & 1); /* jwz: go the other way sometimes */
132 if (sp->first_time) {
133 XClearWindow (display, MI_WINDOW(mi));
135 } else if (!sp->image_loading_p && !halfrandom(sp, 10)) {
137 sp->nblits_remaining = 0;
141 if (halfrandom(sp, 5))
143 if (halfrandom(sp, 5))
149 if (MI_NPIXELS(mi) > 2)
150 XSetForeground(display, gc, MI_PIXEL(mi, halfrandom(sp, MI_NPIXELS(mi))));
151 else if (halfrandom(sp, 2))
152 XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
154 XSetForeground(display, gc, MI_BLACK_PIXEL(mi));
156 for (i = 0; i < n; i++) {
157 int ww = ((w / 2) + halfrandom(sp, MAX(w, 1)));
160 if (MI_NPIXELS(mi) > 2)
161 XSetForeground(display, gc, MI_PIXEL(mi, halfrandom(sp, MI_NPIXELS(mi))));
162 else if (halfrandom(sp, 2))
163 XSetForeground(display, gc, MI_WHITE_PIXEL(mi));
165 XSetForeground(display, gc, MI_BLACK_PIXEL(mi));
167 XFillRectangle(display, MI_WINDOW(mi), gc,
168 halfrandom(sp, MAX(sp->width - ww, 1)),
169 halfrandom(sp, MAX(sp->height - ww, 1)),
175 #ifdef STANDALONE /* jwz -- sometimes hack the desktop image! */
176 if (!sp->image_loading_p &&
177 (1||halfrandom(sp, 2) == 0)) {
178 /* Load it into a pixmap so that the "Loading" message and checkerboard
179 don't show up on the window -- we keep running while the image is
181 Pixmap p = XCreatePixmap (MI_DISPLAY(mi), MI_WINDOW(mi),
182 sp->width, sp->height, mi->xgwa.depth);
183 sp->image_loading_p = True;
184 load_image_async (ScreenOfDisplay (MI_DISPLAY(mi), 0/*####MI_SCREEN(mi)*/),
185 MI_WINDOW(mi), p, image_loaded_cb, mi);
195 int i = (int) floor(d);
198 if ((LRAND() & 0xff) < f * 0xff)
204 reshape_slip (ModeInfo * mi, int w, int h)
206 slipstruct *sp = &slips[MI_SCREEN(mi)];
209 sp->blit_width = sp->width / 25;
210 sp->blit_height = sp->height / 25;
213 sp->nblits_remaining = 0;
217 init_slip (ModeInfo * mi)
222 sp = &slips[MI_SCREEN(mi)];
224 sp->nblits_remaining = 0;
228 /* no "NoExpose" events from XCopyArea wanted */
229 XSetGraphicsExposures(MI_DISPLAY(mi), MI_GC(mi), False);
231 reshape_slip (mi, MI_WIDTH(mi), MI_HEIGHT(mi));
235 draw_slip (ModeInfo * mi)
237 Display *display = MI_DISPLAY(mi);
238 Window window = MI_WINDOW(mi);
245 sp = &slips[MI_SCREEN(mi)];
247 timer = MI_COUNT(mi) * MI_CYCLES(mi);
250 int xi = halfrandom(sp, MAX(sp->width - sp->blit_width, 1));
251 int yi = halfrandom(sp, MAX(sp->height - sp->blit_height, 1));
252 double x, y, dx = 0, dy = 0, t, s1, s2;
254 if (0 == sp->nblits_remaining--) {
255 static const int lut[] = {0, 0, 0, 1, 1, 1, 2};
257 if (!prepare_screen(mi, sp))
259 MI_IS_DRAWN(mi) = True;
260 sp->nblits_remaining = MI_COUNT(mi) *
261 (2000 + halfrandom(sp, 1000) + halfrandom(sp, 1000));
263 sp->mode = halfrandom(sp, 2);
265 sp->mode = lut[halfrandom(sp, 7)];
267 x = (2 * xi + sp->blit_width) / (double) sp->width - 1;
268 y = (2 * yi + sp->blit_height) / (double) sp->height - 1;
270 /* (x,y) is in biunit square */
286 t = dx * dx + dy * dy + 1e-10;
287 s1 = 2 * dx * dx / t - 1;
288 s2 = 2 * dx * dy / t;
292 if (sp->backwards) { /* jwz: go the other way sometimes */
297 case 1: /* shuffle */
301 case 2: /* explode */
307 int qx = xi + quantize(dx), qy = yi + quantize(dy);
310 if (qx < 0 || qy < 0 ||
311 qx >= sp->width - sp->blit_width ||
312 qy >= sp->height - sp->blit_height)
316 Seems to cause problems using Exceed
318 X Error of failed request: BadGC (invalid GC parameter)
320 X Error of failed request: BadDrawable (invalid Pixmap or Window parameter)
321 Major opcode of failed request: 62 (X_CopyArea)
323 XCopyArea(display, window, window, gc, xi, yi,
324 sp->blit_width, sp->blit_height,
329 wrap = sp->width - (2 * sp->blit_width);
331 XCopyArea(display, window, window, gc, qx, qy,
332 sp->blit_width, sp->blit_height,
335 if (qx < 2 * sp->blit_width) {
336 XCopyArea(display, window, window, gc, qx, qy,
337 sp->blit_width, sp->blit_height,
340 wrap = sp->height - (2 * sp->blit_height);
342 XCopyArea(display, window, window, gc, qx, qy,
343 sp->blit_width, sp->blit_height,
346 if (qy < 2 * sp->blit_height) {
347 XCopyArea(display, window, window, gc, qx, qy,
348 sp->blit_width, sp->blit_height,
361 slip_handle_event (ModeInfo *mi, XEvent *event)
363 slipstruct *sp = &slips[MI_SCREEN(mi)];
364 if (screenhack_event_helper (MI_DISPLAY(mi), MI_WINDOW(mi), event))
367 sp->nblits_remaining = 0;
373 XSCREENSAVER_MODULE ("Slip", slip)
375 #endif /* MODE_slip */