1 /* -*- mode: C; tab-width: 4 -*-
2 * xscreensaver, Copyright (c) 1992-2008 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
14 * by Jonas Munsin (jmunsin@iki.fi) and Jamie Zawinski <jwz@jwz.org>
16 * -check the allocations in init_round_lense again, maybe make it possible again
17 * to use swamp without pre-allocating/calculating (although that
18 * makes it slower) - -swamp is memory hungry
19 * -more distortion matrices (fortunately, I'm out of ideas :)
20 * Stuff that would be cool but probably too much of a resource hog:
21 * -some kind of interpolation to avoid jaggies
22 * -large speed values leaves the image distorted
23 * program idea borrowed from a screensaver on a non-*NIX OS,
25 * 28 Sep 1999 Jonas Munsin (jmunsin@iki.fi)
26 * Added about 10x faster algortim for 8, 16 and 32 bpp (modifies pixels
27 * directly avoiding costly XPutPixle(XGetPixel()) calls, inspired by
28 * xwhirl made by horvai@clipper.ens.fr (Peter Horvai) and the XFree86
30 * This piece of code is really horrible, but it works, and at the moment
31 * I don't have time or inspiration to fix something that works (knock
33 * 08 Oct 1999 Jonas Munsin (jmunsin@iki.fi)
34 * Corrected several bugs causing references beyond allocated memory.
38 #include "screenhack.h"
39 /*#include <X11/Xmd.h>*/
41 #ifdef HAVE_XSHM_EXTENSION
43 #endif /* HAVE_XSHM_EXTENSION */
45 #define CARD32 unsigned int
46 #define CARD16 unsigned short
47 #define CARD8 unsigned char
61 struct coo xy_coo[10];
63 int delay, radius, speed, number, blackhole, vortex, magnify, reflect, slow;
67 XWindowAttributes xgwa;
69 unsigned long black_pixel;
71 XImage *orig_map, *buffer_map;
72 unsigned long *buffer_map_cache;
80 #ifdef HAVE_XSHM_EXTENSION
82 XShmSegmentInfo shm_info;
83 #endif /* HAVE_XSHM_EXTENSION */
85 void (*effect) (struct state *, int);
86 void (*draw) (struct state *, int);
87 void (*draw_routine) (struct state *st, XImage *, XImage *, int, int, int *);
89 async_load_state *img_loader;
93 static void move_lense(struct state *, int);
94 static void swamp_thing(struct state *, int);
95 static void new_rnd_coo(struct state *, int);
96 static void init_round_lense(struct state *st);
97 static void reflect_draw(struct state *, int);
98 static void plain_draw(struct state *, int);
100 static void fast_draw_8 (struct state *st, XImage *, XImage *, int, int, int *);
101 static void fast_draw_16(struct state *st, XImage *, XImage *, int, int, int *);
102 static void fast_draw_32(struct state *st, XImage *, XImage *, int, int, int *);
103 static void generic_draw(struct state *st, XImage *, XImage *, int, int, int *);
106 static void distort_finish_loading (struct state *);
110 distort_init (Display *dpy, Window window)
112 struct state *st = (struct state *) calloc (1, sizeof(*st));
120 st->delay = get_integer_resource(st->dpy, "delay", "Integer");
121 st->duration = get_integer_resource (st->dpy, "duration", "Seconds");
122 st->radius = get_integer_resource(st->dpy, "radius", "Integer");
123 st->speed = get_integer_resource(st->dpy, "speed", "Integer");
124 st->number = get_integer_resource(st->dpy, "number", "Integer");
126 if (st->delay < 0) st->delay = 0;
127 if (st->duration < 1) st->duration = 1;
129 #ifdef HAVE_XSHM_EXTENSION
130 st->use_shm = get_boolean_resource(st->dpy, "useSHM", "Boolean");
131 #endif /* HAVE_XSHM_EXTENSION */
133 st->blackhole = get_boolean_resource(st->dpy, "blackhole", "Boolean");
134 st->vortex = get_boolean_resource(st->dpy, "vortex", "Boolean");
135 st->magnify = get_boolean_resource(st->dpy, "magnify", "Boolean");
136 st->reflect = get_boolean_resource(st->dpy, "reflect", "Boolean");
137 st->slow = get_boolean_resource(st->dpy, "slow", "Boolean");
140 s = get_string_resource(st->dpy, "effect", "String");
141 if (s && !strcasecmp(s,"swamp"))
142 st->effect = &swamp_thing;
143 else if (s && !strcasecmp(s,"bounce"))
144 st->effect = &move_lense;
145 else if (s && !strcasecmp(s,"none"))
148 fprintf(stderr,"%s: bogus effect: %s\n", progname, s);
150 XGetWindowAttributes (st->dpy, st->window, &st->xgwa);
152 if (st->effect == NULL && st->radius == 0 && st->speed == 0 && st->number == 0
153 && !st->blackhole && !st->vortex && !st->magnify && !st->reflect) {
154 /* if no cmdline options are given, randomly choose one of:
155 * -radius 50 -number 4 -speed 1 -bounce
156 * -radius 50 -number 4 -speed 1 -blackhole
157 * -radius 50 -number 4 -speed 1 -vortex
158 * -radius 50 -number 4 -speed 1 -vortex -magnify
159 * -radius 50 -number 4 -speed 1 -vortex -magnify -blackhole
160 * -radius 100 -number 1 -speed 2 -bounce
161 * -radius 100 -number 1 -speed 2 -blackhole
162 * -radius 100 -number 1 -speed 2 -vortex
163 * -radius 100 -number 1 -speed 2 -vortex -magnify
164 * -radius 100 -number 1 -speed 2 -vortex -magnify -blackhole
165 * -radius 80 -number 1 -speed 2 -reflect
166 * -radius 50 -number 3 -speed 2 -reflect
168 * -radius 50 -number 4 -speed 2 -swamp
169 * -radius 50 -number 4 -speed 2 -swamp -blackhole
170 * -radius 50 -number 4 -speed 2 -swamp -vortex
171 * -radius 50 -number 4 -speed 2 -swamp -vortex -magnify
172 * -radius 50 -number 4 -speed 2 -swamp -vortex -magnify -blackhole
175 i = (random() % 12 /* 17 */);
177 st->draw = &plain_draw;
181 st->radius=50;st->number=4;st->speed=1;
182 st->effect=&move_lense;break;
184 st->radius=50;st->number=4;st->speed=1;st->blackhole=1;
185 st->effect=&move_lense;break;
187 st->radius=50;st->number=4;st->speed=1;st->vortex=1;
188 st->effect=&move_lense;break;
190 st->radius=50;st->number=4;st->speed=1;st->vortex=1;st->magnify=1;
191 st->effect=&move_lense;break;
193 st->radius=50;st->number=4;st->speed=1;st->vortex=1;st->magnify=1;st->blackhole=1;
194 st->effect=&move_lense;break;
196 st->radius=100;st->number=1;st->speed=2;
197 st->effect=&move_lense;break;
199 st->radius=100;st->number=1;st->speed=2;st->blackhole=1;
200 st->effect=&move_lense;break;
202 st->radius=100;st->number=1;st->speed=2;st->vortex=1;
203 st->effect=&move_lense;break;
205 st->radius=100;st->number=1;st->speed=2;st->vortex=1;st->magnify=1;
206 st->effect=&move_lense;break;
208 st->radius=100;st->number=1;st->speed=2;st->vortex=1;st->magnify=1;st->blackhole=1;
209 st->effect=&move_lense;break;
212 st->radius=80;st->number=1;st->speed=2;st->reflect=1;
213 st->draw = &reflect_draw;st->effect = &move_lense;break;
215 st->radius=50;st->number=4;st->speed=2;st->reflect=1;
216 st->draw = &reflect_draw;st->effect = &move_lense;break;
218 #if 0 /* jwz: not these */
220 st->radius=50;st->number=4;st->speed=2;
221 effect=&swamp_thing;break;
223 st->radius=50;st->number=4;st->speed=2;st->blackhole=1;
224 effect=&swamp_thing;break;
226 st->radius=50;st->number=4;st->speed=2;st->vortex=1;
227 effect=&swamp_thing;break;
229 st->radius=50;st->number=4;st->speed=2;st->vortex=1;st->magnify=1;
230 effect=&swamp_thing;break;
232 st->radius=50;st->number=4;st->speed=2;st->vortex=1;st->magnify=1;st->blackhole=1;
233 effect=&swamp_thing;break;
240 /* but if the window is small, reduce default radius */
241 if (st->xgwa.width < st->radius * 8)
242 st->radius = st->xgwa.width/8;
245 /* never allow the radius to be too close to the min window dimension
247 if (st->radius >= st->xgwa.width * 0.45) st->radius = st->xgwa.width * 0.45;
248 if (st->radius >= st->xgwa.height * 0.45) st->radius = st->xgwa.height * 0.45;
251 /* -swamp mode consumes vast amounts of memory, proportional to radius --
252 so throttle radius to a small-ish value (60 => ~30MB.)
254 if (st->effect == &swamp_thing && st->radius > 60)
265 if (st->number >= 10)
267 if (st->effect == NULL)
268 st->effect = &move_lense;
270 st->draw = &reflect_draw;
271 st->effect = &move_lense;
273 if (st->draw == NULL)
274 st->draw = &plain_draw;
276 st->black_pixel = BlackPixelOfScreen( st->xgwa.screen );
278 gcv.function = GXcopy;
279 gcv.subwindow_mode = IncludeInferiors;
280 gcflags = GCFunction;
282 if (use_subwindow_mode_p(st->xgwa.screen, st->window)) /* see grabscreen.c */
283 gcflags |= GCSubwindowMode;
284 st->gc = XCreateGC (st->dpy, st->window, gcflags, &gcv);
286 st->img_loader = load_image_async_simple (0, st->xgwa.screen, st->window,
288 st->start_time = time ((time_t) 0);
293 distort_finish_loading (struct state *st)
297 st->start_time = time ((time_t) 0);
300 st->orig_map = XGetImage(st->dpy, st->window, 0, 0, st->xgwa.width, st->xgwa.height,
302 st->buffer_map_cache = malloc(sizeof(unsigned long)*(2*st->radius+st->speed+2)*(2*st->radius+st->speed+2));
304 if (st->buffer_map_cache == NULL) {
309 # ifdef HAVE_XSHM_EXTENSION
313 st->buffer_map = create_xshm_image(st->dpy, st->xgwa.visual, st->orig_map->depth,
314 ZPixmap, 0, &st->shm_info,
315 2*st->radius + st->speed + 2,
316 2*st->radius + st->speed + 2);
320 # endif /* HAVE_XSHM_EXTENSION */
324 st->buffer_map = XCreateImage(st->dpy, st->xgwa.visual,
325 st->orig_map->depth, ZPixmap, 0, 0,
326 2*st->radius + st->speed + 2, 2*st->radius + st->speed + 2,
328 st->buffer_map->data = (char *)
329 calloc(st->buffer_map->height, st->buffer_map->bytes_per_line);
332 if ((st->buffer_map->byte_order == st->orig_map->byte_order)
333 && (st->buffer_map->depth == st->orig_map->depth)
334 && (st->buffer_map->format == ZPixmap)
335 && (st->orig_map->format == ZPixmap)
337 switch (st->orig_map->bits_per_pixel) {
339 st->draw_routine = &fast_draw_32;
340 st->bpp_size = sizeof(CARD32);
343 st->draw_routine = &fast_draw_16;
344 st->bpp_size = sizeof(CARD16);
347 st->draw_routine = &fast_draw_8;
348 st->bpp_size = sizeof(CARD8);
351 st->draw_routine = &generic_draw;
355 st->draw_routine = &generic_draw;
357 init_round_lense(st);
359 for (i = 0; i < st->number; i++) {
362 st->xy_coo[i].r = (i*st->radius)/(st->number-1); /* "randomize" initial */
365 st->xy_coo[i].r_change = st->speed + (i%2)*2*(-st->speed); /* values a bit */
366 st->xy_coo[i].xmove = st->speed + (i%2)*2*(-st->speed);
367 st->xy_coo[i].ymove = st->speed + (i%2)*2*(-st->speed);
371 /* example: initializes a "see-trough" matrix */
372 /* static void make_null_lense(struct state *st)
375 for (i = 0; i < 2*radius+speed+2; i++) {
376 for (j = 0 ; j < 2*radius+speed+2 ; j++) {
383 static void convert(struct state *st)
387 st->fast_from = calloc(1, sizeof(int)*((st->buffer_map->bytes_per_line/st->bpp_size)*(2*st->radius+st->speed+2) + 2*st->radius+st->speed+2));
388 if (st->fast_from == NULL) {
393 for (i = 0; i < 2*st->radius+st->speed+2; i++) {
394 for (j = 0; j < 2*st->radius+st->speed+2; j++) {
395 *(p + i + j*st->buffer_map->bytes_per_line/st->bpp_size)
396 = st->from[i][j][0] + st->xgwa.width*st->from[i][j][1];
397 if (*(p + i + j*st->buffer_map->bytes_per_line/st->bpp_size) < 0
398 || *(p + i + j*st->buffer_map->bytes_per_line/st->bpp_size) >= st->orig_map->height*st->orig_map->width) {
399 *(p + i + j*st->buffer_map->bytes_per_line/st->bpp_size) = 0;
405 /* makes a lense with the Radius=loop and centred in
406 * the point (radius, radius)
408 static void make_round_lense(struct state *st, int radius, int loop)
412 for (i = 0; i < 2*radius+st->speed+2; i++) {
413 for(j = 0; j < ((0 == st->bpp_size) ? (2*radius+st->speed+2) : (st->buffer_map->bytes_per_line/st->bpp_size)); j++) {
415 r = sqrt ((i-radius)*(i-radius)+(j-radius)*(j-radius));
423 if (st->vortex) { /* vortex-twist effect */
425 /* this one-line formula for getting a nice rotation angle is borrowed
426 * (with permission) from the whirl plugin for gimp,
427 * Copyright (C) 1996 Federico Mena Quintero
429 /* 5 is just a constant used because it looks good :) */
430 angle = 5*(1-d)*(1-d);
432 /* Avoid atan2: DOMAIN error message */
433 if ((radius-j) == 0.0 && (radius-i) == 0.0) {
434 st->from[i][j][0] = radius + cos(angle)*r;
435 st->from[i][j][1] = radius + sin(angle)*r;
437 st->from[i][j][0] = radius +
438 cos(angle - atan2(radius-j, -(radius-i)))*r;
439 st->from[i][j][1] = radius +
440 sin(angle - atan2(radius-j, -(radius-i)))*r;
444 if (st->blackhole && r != 0) /* blackhole effect */
446 st->from[i][j][0] = radius + (st->from[i][j][0]-radius)*r;
447 st->from[i][j][1] = radius + (st->from[i][j][1]-radius)*r;
449 } else { /* default is to magnify */
452 /* raising r to different power here gives different amounts of
453 * distortion, a negative value sucks everything into a black hole
456 if (st->blackhole && r != 0) /* blackhole effect */
458 /* bubble effect (and blackhole) */
459 st->from[i][j][0] = radius + (i-radius)*r;
460 st->from[i][j][1] = radius + (j-radius)*r;
462 } else { /* not inside loop */
463 st->from[i][j][0] = i;
464 st->from[i][j][1] = j;
469 /* this is really just a quick hack to keep both the compability mode with all depths and still
470 * allow the custom optimized draw routines with the minimum amount of work */
471 if (0 != st->bpp_size) {
477 # define EXIT_FAILURE -1
480 static void allocate_lense(struct state *st)
483 int s = ((0 != st->bpp_size) ? (st->buffer_map->bytes_per_line/st->bpp_size) : (2*st->radius+st->speed+2));
484 /* maybe this should be redone so that from[][][] is in one block;
485 * then pointers could be used instead of arrays in some places (and
486 * maybe give a speedup - maybe also consume less memory)
488 st->from = (int ***)malloc(s*sizeof(int **));
489 if (st->from == NULL) {
493 for (i = 0; i < s; i++) {
494 st->from[i] = (int **)malloc((2*st->radius+st->speed+2) * sizeof(int *));
495 if (st->from[i] == NULL) {
499 for (j = 0; j < s; j++) {
500 st->from[i][j] = (int *)malloc(2 * sizeof(int));
501 if (st->from[i][j] == NULL) {
509 /* from_array in an array containing precalculated from matrices,
510 * this is a double faced mem vs speed trade, it's faster, but eats
511 * _a lot_ of mem for large radius (is there a bug here? I can't see it)
513 static void init_round_lense(struct state *st)
517 if (st->effect == &swamp_thing) {
518 st->from_array = (int ****)malloc((st->radius+1)*sizeof(int ***));
519 for (k=0; k <= st->radius; k++) {
521 make_round_lense(st, st->radius, k);
522 st->from_array[k] = st->from;
524 } else { /* just allocate one from[][][] */
526 make_round_lense(st, st->radius,st->radius);
530 /* If fast_draw_8, fast_draw_16 or fast_draw_32 are to be used, the following properties
531 * of the src and dest XImages must hold (otherwise the generic, slooow, method provided
532 * by X is to be used):
533 * src->byte_order == dest->byte_order
534 * src->format == ZPixmap && dest->format == ZPixmap
535 * src->depth == dest->depth == the depth the function in question asumes
536 * x and y is the coordinates in src from where to cut out the image from,
537 * distort_matrix is a precalculated array of how to distort the matrix
540 static void fast_draw_8(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
542 CARD8 *u = (CARD8 *)dest->data;
543 CARD8 *t = (CARD8 *)src->data + x + y*src->bytes_per_line/sizeof(CARD8);
545 while (u < (CARD8 *)(dest->data + sizeof(CARD8)*dest->height
546 *dest->bytes_per_line/sizeof(CARD8))) {
547 *u++ = t[*distort_matrix++];
551 static void fast_draw_16(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
553 CARD16 *u = (CARD16 *)dest->data;
554 CARD16 *t = (CARD16 *)src->data + x + y*src->bytes_per_line/sizeof(CARD16);
556 while (u < (CARD16 *)(dest->data + sizeof(CARD16)*dest->height
557 *dest->bytes_per_line/sizeof(CARD16))) {
558 *u++ = t[*distort_matrix++];
562 static void fast_draw_32(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
564 CARD32 *u = (CARD32 *)dest->data;
565 CARD32 *t = (CARD32 *)src->data + x + y*src->bytes_per_line/sizeof(CARD32);
567 while (u < (CARD32 *)(dest->data + sizeof(CARD32)*dest->height
568 *dest->bytes_per_line/sizeof(CARD32))) {
569 *u++ = t[*distort_matrix++];
573 static void generic_draw(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
576 for (i = 0; i < dest->width; i++)
577 for (j = 0; j < dest->height; j++)
578 if (st->from[i][j][0] + x >= 0 &&
579 st->from[i][j][0] + x < src->width &&
580 st->from[i][j][1] + y >= 0 &&
581 st->from[i][j][1] + y < src->height)
582 XPutPixel(dest, i, j,
584 st->from[i][j][0] + x,
585 st->from[i][j][1] + y));
588 /* generate an XImage of from[][][] and draw it on the screen */
589 static void plain_draw(struct state *st, int k)
591 if (st->xy_coo[k].x+2*st->radius+st->speed+2 > st->orig_map->width ||
592 st->xy_coo[k].y+2*st->radius+st->speed+2 > st->orig_map->height)
595 st->draw_routine(st, st->orig_map, st->buffer_map, st->xy_coo[k].x, st->xy_coo[k].y, st->fast_from);
597 # ifdef HAVE_XSHM_EXTENSION
599 XShmPutImage(st->dpy, st->window, st->gc, st->buffer_map, 0, 0, st->xy_coo[k].x, st->xy_coo[k].y,
600 2*st->radius+st->speed+2, 2*st->radius+st->speed+2, False);
605 XPutImage(st->dpy, st->window, st->gc, st->buffer_map, 0, 0, st->xy_coo[k].x, st->xy_coo[k].y,
606 2*st->radius+st->speed+2, 2*st->radius+st->speed+2);
611 /* generate an XImage from the reflect algoritm submitted by
612 * Randy Zack <randy@acucorp.com>
613 * draw really got too big and ugly so I split it up
614 * it should be possible to use the from[][] to speed it up
615 * (once I figure out the algorithm used :)
617 static void reflect_draw(struct state *st, int k)
621 int ly, lysq, lx, ny, dist, rsq = st->radius * st->radius;
623 cx = cy = st->radius;
624 if (st->xy_coo[k].ymove > 0)
626 if (st->xy_coo[k].xmove > 0)
629 for(i = 0 ; i < 2*st->radius+st->speed+2; i++) {
632 ny = st->xy_coo[k].y + i;
633 if (ny >= st->orig_map->height) ny = st->orig_map->height-1;
634 for(j = 0 ; j < 2*st->radius+st->speed+2 ; j++) {
636 dist = lx * lx + lysq;
638 ly < -st->radius || ly > st->radius ||
639 lx < -st->radius || lx > st->radius)
640 XPutPixel( st->buffer_map, j, i,
641 XGetPixel( st->orig_map, st->xy_coo[k].x + j, ny ));
643 XPutPixel( st->buffer_map, j, i, st->black_pixel );
645 int x = st->xy_coo[k].x + cx + (lx * rsq / dist);
646 int y = st->xy_coo[k].y + cy + (ly * rsq / dist);
647 if (x < 0 || x >= st->xgwa.width ||
648 y < 0 || y >= st->xgwa.height)
649 XPutPixel( st->buffer_map, j, i, st->black_pixel );
651 XPutPixel( st->buffer_map, j, i,
652 XGetPixel( st->orig_map, x, y ));
657 XPutImage(st->dpy, st->window, st->gc, st->buffer_map, 0, 0, st->xy_coo[k].x, st->xy_coo[k].y,
658 2*st->radius+st->speed+2, 2*st->radius+st->speed+2);
661 /* create a new, random coordinate, that won't interfer with any other
662 * coordinates, as the drawing routines would be significantly slowed
663 * down if they were to handle serveral layers of distortions
665 static void new_rnd_coo(struct state *st, int k)
669 st->xy_coo[k].x = (random() % (st->xgwa.width-2*st->radius));
670 st->xy_coo[k].y = (random() % (st->xgwa.height-2*st->radius));
672 for (i = 0; i < st->number; i++) {
674 if ((abs(st->xy_coo[k].x - st->xy_coo[i].x) <= 2*st->radius+st->speed+2)
675 && (abs(st->xy_coo[k].y - st->xy_coo[i].y) <= 2*st->radius+st->speed+2)) {
676 st->xy_coo[k].x = (random() % (st->xgwa.width-2*st->radius));
677 st->xy_coo[k].y = (random() % (st->xgwa.height-2*st->radius));
684 /* move lens and handle bounces with walls and other lenses */
685 static void move_lense(struct state *st, int k)
689 if (st->xy_coo[k].x + 2*st->radius + st->speed + 2 >= st->xgwa.width)
690 st->xy_coo[k].xmove = -abs(st->xy_coo[k].xmove);
691 if (st->xy_coo[k].x <= st->speed)
692 st->xy_coo[k].xmove = abs(st->xy_coo[k].xmove);
693 if (st->xy_coo[k].y + 2*st->radius + st->speed + 2 >= st->xgwa.height)
694 st->xy_coo[k].ymove = -abs(st->xy_coo[k].ymove);
695 if (st->xy_coo[k].y <= st->speed)
696 st->xy_coo[k].ymove = abs(st->xy_coo[k].ymove);
698 st->xy_coo[k].x = st->xy_coo[k].x + st->xy_coo[k].xmove;
699 st->xy_coo[k].y = st->xy_coo[k].y + st->xy_coo[k].ymove;
701 /* bounce against othe lenses */
702 for (i = 0; i < st->number; i++) {
705 /* This commented test is for rectangular lenses (not currently used) and
706 * the one used is for circular ones
707 && (abs(xy_coo[k].x - xy_coo[i].x) <= 2*radius)
708 && (abs(xy_coo[k].y - xy_coo[i].y) <= 2*radius)) { */
710 && ((st->xy_coo[k].x - st->xy_coo[i].x)*(st->xy_coo[k].x - st->xy_coo[i].x)
711 + (st->xy_coo[k].y - st->xy_coo[i].y)*(st->xy_coo[k].y - st->xy_coo[i].y)
712 <= 2*st->radius*2*st->radius)) {
715 x = st->xy_coo[k].xmove;
716 y = st->xy_coo[k].ymove;
717 st->xy_coo[k].xmove = st->xy_coo[i].xmove;
718 st->xy_coo[k].ymove = st->xy_coo[i].ymove;
719 st->xy_coo[i].xmove = x;
720 st->xy_coo[i].ymove = y;
726 /* make xy_coo[k] grow/shrink */
727 static void swamp_thing(struct state *st, int k)
729 if (st->xy_coo[k].r >= st->radius)
730 st->xy_coo[k].r_change = -abs(st->xy_coo[k].r_change);
732 if (st->xy_coo[k].r <= 0) {
733 st->from = st->from_array[0];
735 st->xy_coo[k].r_change = abs(st->xy_coo[k].r_change);
737 st->xy_coo[k].r=st->xy_coo[k].r_change;
741 st->xy_coo[k].r = st->xy_coo[k].r + st->xy_coo[k].r_change;
743 if (st->xy_coo[k].r >= st->radius)
744 st->xy_coo[k].r = st->radius;
745 if (st->xy_coo[k].r <= 0)
748 st->from = st->from_array[st->xy_coo[k].r];
753 distort_draw (Display *dpy, Window window, void *closure)
755 struct state *st = (struct state *) closure;
758 if (st->img_loader) /* still loading */
760 st->img_loader = load_image_async_simple (st->img_loader, 0, 0, 0, 0, 0);
761 if (! st->img_loader) { /* just finished */
762 distort_finish_loading (st);
767 if (!st->img_loader &&
768 st->start_time + st->duration < time ((time_t) 0)) {
769 st->img_loader = load_image_async_simple (0, st->xgwa.screen, st->window,
774 for (k = 0; k < st->number; k++) {
782 distort_reshape (Display *dpy, Window window, void *closure,
783 unsigned int w, unsigned int h)
788 distort_event (Display *dpy, Window window, void *closure, XEvent *event)
794 distort_free (Display *dpy, Window window, void *closure)
796 struct state *st = (struct state *) closure;
797 XFreeGC (st->dpy, st->gc);
798 if (st->orig_map) XDestroyImage (st->orig_map);
799 if (st->buffer_map) XDestroyImage (st->buffer_map);
800 if (st->from) free (st->from);
801 if (st->fast_from) free (st->fast_from);
802 if (st->from_array) free (st->from_array);
809 static const char *distort_defaults [] = {
810 "*dontClearRoot: True",
811 "*background: Black",
813 #ifdef __sgi /* really, HAVE_READ_DISPLAY_EXTENSION */
828 #ifdef HAVE_XSHM_EXTENSION
829 "*useSHM: False", /* xshm turns out not to help. */
830 #endif /* HAVE_XSHM_EXTENSION */
834 static XrmOptionDescRec distort_options [] = {
835 { "-delay", ".delay", XrmoptionSepArg, 0 },
836 { "-duration", ".duration", XrmoptionSepArg, 0 },
837 { "-radius", ".radius", XrmoptionSepArg, 0 },
838 { "-speed", ".speed", XrmoptionSepArg, 0 },
839 { "-number", ".number", XrmoptionSepArg, 0 },
841 { "-effect", ".effect", XrmoptionSepArg, 0 },
842 { "-swamp", ".effect", XrmoptionNoArg, "swamp" },
843 { "-bounce", ".effect", XrmoptionNoArg, "bounce" },
845 { "-reflect", ".reflect", XrmoptionNoArg, "True" },
846 { "-vortex", ".vortex", XrmoptionNoArg, "True" },
847 { "-magnify", ".magnify", XrmoptionNoArg, "True" },
848 { "-blackhole", ".blackhole", XrmoptionNoArg, "True" },
849 { "-slow", ".slow", XrmoptionNoArg, "True" },
850 #ifdef HAVE_XSHM_EXTENSION
851 { "-shm", ".useSHM", XrmoptionNoArg, "True" },
852 { "-no-shm", ".useSHM", XrmoptionNoArg, "False" },
853 #endif /* HAVE_XSHM_EXTENSION */
857 XSCREENSAVER_MODULE ("Distort", distort)