1 /* -*- mode: C; tab-width: 4 -*-
2 * xscreensaver, Copyright (c) 1992-2006 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;
64 XWindowAttributes xgwa;
66 unsigned long black_pixel;
68 XImage *orig_map, *buffer_map;
69 unsigned long *buffer_map_cache;
77 #ifdef HAVE_XSHM_EXTENSION
79 XShmSegmentInfo shm_info;
80 #endif /* HAVE_XSHM_EXTENSION */
82 void (*effect) (struct state *, int);
83 void (*draw) (struct state *, int);
84 void (*draw_routine) (struct state *st, XImage *, XImage *, int, int, int *);
86 async_load_state *img_loader;
90 static void move_lense(struct state *, int);
91 static void swamp_thing(struct state *, int);
92 static void new_rnd_coo(struct state *, int);
93 static void init_round_lense(struct state *st);
94 static void reflect_draw(struct state *, int);
95 static void plain_draw(struct state *, int);
97 static void fast_draw_8 (struct state *st, XImage *, XImage *, int, int, int *);
98 static void fast_draw_16(struct state *st, XImage *, XImage *, int, int, int *);
99 static void fast_draw_32(struct state *st, XImage *, XImage *, int, int, int *);
100 static void generic_draw(struct state *st, XImage *, XImage *, int, int, int *);
103 static void distort_finish_loading (struct state *);
106 distort_init (Display *dpy, Window window)
108 struct state *st = (struct state *) calloc (1, sizeof(*st));
117 st->delay = get_integer_resource(st->dpy, "delay", "Integer");
118 st->radius = get_integer_resource(st->dpy, "radius", "Integer");
119 st->speed = get_integer_resource(st->dpy, "speed", "Integer");
120 st->number = get_integer_resource(st->dpy, "number", "Integer");
122 #ifdef HAVE_XSHM_EXTENSION
123 st->use_shm = get_boolean_resource(st->dpy, "useSHM", "Boolean");
124 #endif /* HAVE_XSHM_EXTENSION */
126 st->blackhole = get_boolean_resource(st->dpy, "blackhole", "Boolean");
127 st->vortex = get_boolean_resource(st->dpy, "vortex", "Boolean");
128 st->magnify = get_boolean_resource(st->dpy, "magnify", "Boolean");
129 st->reflect = get_boolean_resource(st->dpy, "reflect", "Boolean");
130 st->slow = get_boolean_resource(st->dpy, "slow", "Boolean");
133 s = get_string_resource(st->dpy, "effect", "String");
134 if (s && !strcasecmp(s,"swamp"))
135 st->effect = &swamp_thing;
136 else if (s && !strcasecmp(s,"bounce"))
137 st->effect = &move_lense;
138 else if (s && !strcasecmp(s,"none"))
141 fprintf(stderr,"%s: bogus effect: %s\n", progname, s);
143 XGetWindowAttributes (st->dpy, st->window, &st->xgwa);
145 if (st->effect == NULL && st->radius == 0 && st->speed == 0 && st->number == 0
146 && !st->blackhole && !st->vortex && !st->magnify && !st->reflect) {
147 /* if no cmdline options are given, randomly choose one of:
148 * -radius 50 -number 4 -speed 1 -bounce
149 * -radius 50 -number 4 -speed 1 -blackhole
150 * -radius 50 -number 4 -speed 1 -vortex
151 * -radius 50 -number 4 -speed 1 -vortex -magnify
152 * -radius 50 -number 4 -speed 1 -vortex -magnify -blackhole
153 * -radius 100 -number 1 -speed 2 -bounce
154 * -radius 100 -number 1 -speed 2 -blackhole
155 * -radius 100 -number 1 -speed 2 -vortex
156 * -radius 100 -number 1 -speed 2 -vortex -magnify
157 * -radius 100 -number 1 -speed 2 -vortex -magnify -blackhole
158 * -radius 80 -number 1 -speed 2 -reflect
159 * -radius 50 -number 3 -speed 2 -reflect
161 * -radius 50 -number 4 -speed 2 -swamp
162 * -radius 50 -number 4 -speed 2 -swamp -blackhole
163 * -radius 50 -number 4 -speed 2 -swamp -vortex
164 * -radius 50 -number 4 -speed 2 -swamp -vortex -magnify
165 * -radius 50 -number 4 -speed 2 -swamp -vortex -magnify -blackhole
168 i = (random() % 12 /* 17 */);
170 st->draw = &plain_draw;
174 st->radius=50;st->number=4;st->speed=1;
175 st->effect=&move_lense;break;
177 st->radius=50;st->number=4;st->speed=1;st->blackhole=1;
178 st->effect=&move_lense;break;
180 st->radius=50;st->number=4;st->speed=1;st->vortex=1;
181 st->effect=&move_lense;break;
183 st->radius=50;st->number=4;st->speed=1;st->vortex=1;st->magnify=1;
184 st->effect=&move_lense;break;
186 st->radius=50;st->number=4;st->speed=1;st->vortex=1;st->magnify=1;st->blackhole=1;
187 st->effect=&move_lense;break;
189 st->radius=100;st->number=1;st->speed=2;
190 st->effect=&move_lense;break;
192 st->radius=100;st->number=1;st->speed=2;st->blackhole=1;
193 st->effect=&move_lense;break;
195 st->radius=100;st->number=1;st->speed=2;st->vortex=1;
196 st->effect=&move_lense;break;
198 st->radius=100;st->number=1;st->speed=2;st->vortex=1;st->magnify=1;
199 st->effect=&move_lense;break;
201 st->radius=100;st->number=1;st->speed=2;st->vortex=1;st->magnify=1;st->blackhole=1;
202 st->effect=&move_lense;break;
205 st->radius=80;st->number=1;st->speed=2;st->reflect=1;
206 st->draw = &reflect_draw;st->effect = &move_lense;break;
208 st->radius=50;st->number=4;st->speed=2;st->reflect=1;
209 st->draw = &reflect_draw;st->effect = &move_lense;break;
211 #if 0 /* jwz: not these */
213 st->radius=50;st->number=4;st->speed=2;
214 effect=&swamp_thing;break;
216 st->radius=50;st->number=4;st->speed=2;st->blackhole=1;
217 effect=&swamp_thing;break;
219 st->radius=50;st->number=4;st->speed=2;st->vortex=1;
220 effect=&swamp_thing;break;
222 st->radius=50;st->number=4;st->speed=2;st->vortex=1;st->magnify=1;
223 effect=&swamp_thing;break;
225 st->radius=50;st->number=4;st->speed=2;st->vortex=1;st->magnify=1;st->blackhole=1;
226 effect=&swamp_thing;break;
233 /* but if the window is small, reduce default radius */
234 if (st->xgwa.width < st->radius * 8)
235 st->radius = st->xgwa.width/8;
238 /* never allow the radius to be too close to the min window dimension
240 if (st->radius >= st->xgwa.width * 0.45) st->radius = st->xgwa.width * 0.45;
241 if (st->radius >= st->xgwa.height * 0.45) st->radius = st->xgwa.height * 0.45;
244 /* -swamp mode consumes vast amounts of memory, proportional to radius --
245 so throttle radius to a small-ish value (60 => ~30MB.)
247 if (st->effect == &swamp_thing && st->radius > 60)
258 if (st->number >= 10)
260 if (st->effect == NULL)
261 st->effect = &move_lense;
263 st->draw = &reflect_draw;
264 st->effect = &move_lense;
266 if (st->draw == NULL)
267 st->draw = &plain_draw;
269 st->black_pixel = BlackPixelOfScreen( st->xgwa.screen );
271 gcv.function = GXcopy;
272 gcv.subwindow_mode = IncludeInferiors;
273 gcflags = GCFunction;
274 if (use_subwindow_mode_p(st->xgwa.screen, st->window)) /* see grabscreen.c */
275 gcflags |= GCSubwindowMode;
276 st->gc = XCreateGC (st->dpy, st->window, gcflags, &gcv);
278 st->img_loader = load_image_async_simple (0, st->xgwa.screen, st->window,
284 distort_finish_loading (struct state *st)
289 st->orig_map = XGetImage(st->dpy, st->window, 0, 0, st->xgwa.width, st->xgwa.height,
291 st->buffer_map_cache = malloc(sizeof(unsigned long)*(2*st->radius+st->speed+2)*(2*st->radius+st->speed+2));
293 if (st->buffer_map_cache == NULL) {
298 # ifdef HAVE_XSHM_EXTENSION
302 st->buffer_map = create_xshm_image(st->dpy, st->xgwa.visual, st->orig_map->depth,
303 ZPixmap, 0, &st->shm_info,
304 2*st->radius + st->speed + 2,
305 2*st->radius + st->speed + 2);
309 # endif /* HAVE_XSHM_EXTENSION */
313 st->buffer_map = XCreateImage(st->dpy, st->xgwa.visual,
314 st->orig_map->depth, ZPixmap, 0, 0,
315 2*st->radius + st->speed + 2, 2*st->radius + st->speed + 2,
317 st->buffer_map->data = (char *)
318 calloc(st->buffer_map->height, st->buffer_map->bytes_per_line);
321 if ((st->buffer_map->byte_order == st->orig_map->byte_order)
322 && (st->buffer_map->depth == st->orig_map->depth)
323 && (st->buffer_map->format == ZPixmap)
324 && (st->orig_map->format == ZPixmap)
326 switch (st->orig_map->bits_per_pixel) {
328 st->draw_routine = &fast_draw_32;
329 st->bpp_size = sizeof(CARD32);
332 st->draw_routine = &fast_draw_16;
333 st->bpp_size = sizeof(CARD16);
336 st->draw_routine = &fast_draw_8;
337 st->bpp_size = sizeof(CARD8);
340 st->draw_routine = &generic_draw;
344 st->draw_routine = &generic_draw;
346 init_round_lense(st);
348 for (i = 0; i < st->number; i++) {
351 st->xy_coo[i].r = (i*st->radius)/(st->number-1); /* "randomize" initial */
354 st->xy_coo[i].r_change = st->speed + (i%2)*2*(-st->speed); /* values a bit */
355 st->xy_coo[i].xmove = st->speed + (i%2)*2*(-st->speed);
356 st->xy_coo[i].ymove = st->speed + (i%2)*2*(-st->speed);
360 /* example: initializes a "see-trough" matrix */
361 /* static void make_null_lense(struct state *st)
364 for (i = 0; i < 2*radius+speed+2; i++) {
365 for (j = 0 ; j < 2*radius+speed+2 ; j++) {
372 static void convert(struct state *st)
376 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));
377 if (st->fast_from == NULL) {
382 for (i = 0; i < 2*st->radius+st->speed+2; i++) {
383 for (j = 0; j < 2*st->radius+st->speed+2; j++) {
384 *(p + i + j*st->buffer_map->bytes_per_line/st->bpp_size)
385 = st->from[i][j][0] + st->xgwa.width*st->from[i][j][1];
386 if (*(p + i + j*st->buffer_map->bytes_per_line/st->bpp_size) < 0
387 || *(p + i + j*st->buffer_map->bytes_per_line/st->bpp_size) >= st->orig_map->height*st->orig_map->width) {
388 *(p + i + j*st->buffer_map->bytes_per_line/st->bpp_size) = 0;
394 /* makes a lense with the Radius=loop and centred in
395 * the point (radius, radius)
397 static void make_round_lense(struct state *st, int radius, int loop)
401 for (i = 0; i < 2*radius+st->speed+2; i++) {
402 for(j = 0; j < ((0 == st->bpp_size) ? (2*radius+st->speed+2) : (st->buffer_map->bytes_per_line/st->bpp_size)); j++) {
404 r = sqrt ((i-radius)*(i-radius)+(j-radius)*(j-radius));
412 if (st->vortex) { /* vortex-twist effect */
414 /* this one-line formula for getting a nice rotation angle is borrowed
415 * (with permission) from the whirl plugin for gimp,
416 * Copyright (C) 1996 Federico Mena Quintero
418 /* 5 is just a constant used because it looks good :) */
419 angle = 5*(1-d)*(1-d);
421 /* Avoid atan2: DOMAIN error message */
422 if ((radius-j) == 0.0 && (radius-i) == 0.0) {
423 st->from[i][j][0] = radius + cos(angle)*r;
424 st->from[i][j][1] = radius + sin(angle)*r;
426 st->from[i][j][0] = radius +
427 cos(angle - atan2(radius-j, -(radius-i)))*r;
428 st->from[i][j][1] = radius +
429 sin(angle - atan2(radius-j, -(radius-i)))*r;
433 if (st->blackhole && r != 0) /* blackhole effect */
435 st->from[i][j][0] = radius + (st->from[i][j][0]-radius)*r;
436 st->from[i][j][1] = radius + (st->from[i][j][1]-radius)*r;
438 } else { /* default is to magnify */
441 /* raising r to different power here gives different amounts of
442 * distortion, a negative value sucks everything into a black hole
445 if (st->blackhole && r != 0) /* blackhole effect */
447 /* bubble effect (and blackhole) */
448 st->from[i][j][0] = radius + (i-radius)*r;
449 st->from[i][j][1] = radius + (j-radius)*r;
451 } else { /* not inside loop */
452 st->from[i][j][0] = i;
453 st->from[i][j][1] = j;
458 /* this is really just a quick hack to keep both the compability mode with all depths and still
459 * allow the custom optimized draw routines with the minimum amount of work */
460 if (0 != st->bpp_size) {
466 # define EXIT_FAILURE -1
469 static void allocate_lense(struct state *st)
472 int s = ((0 != st->bpp_size) ? (st->buffer_map->bytes_per_line/st->bpp_size) : (2*st->radius+st->speed+2));
473 /* maybe this should be redone so that from[][][] is in one block;
474 * then pointers could be used instead of arrays in some places (and
475 * maybe give a speedup - maybe also consume less memory)
477 st->from = (int ***)malloc(s*sizeof(int **));
478 if (st->from == NULL) {
482 for (i = 0; i < s; i++) {
483 st->from[i] = (int **)malloc((2*st->radius+st->speed+2) * sizeof(int *));
484 if (st->from[i] == NULL) {
488 for (j = 0; j < s; j++) {
489 st->from[i][j] = (int *)malloc(2 * sizeof(int));
490 if (st->from[i][j] == NULL) {
498 /* from_array in an array containing precalculated from matrices,
499 * this is a double faced mem vs speed trade, it's faster, but eats
500 * _a lot_ of mem for large radius (is there a bug here? I can't see it)
502 static void init_round_lense(struct state *st)
506 if (st->effect == &swamp_thing) {
507 st->from_array = (int ****)malloc((st->radius+1)*sizeof(int ***));
508 for (k=0; k <= st->radius; k++) {
510 make_round_lense(st, st->radius, k);
511 st->from_array[k] = st->from;
513 } else { /* just allocate one from[][][] */
515 make_round_lense(st, st->radius,st->radius);
519 /* If fast_draw_8, fast_draw_16 or fast_draw_32 are to be used, the following properties
520 * of the src and dest XImages must hold (otherwise the generic, slooow, method provided
521 * by X is to be used):
522 * src->byte_order == dest->byte_order
523 * src->format == ZPixmap && dest->format == ZPixmap
524 * src->depth == dest->depth == the depth the function in question asumes
525 * x and y is the coordinates in src from where to cut out the image from,
526 * distort_matrix is a precalculated array of how to distort the matrix
529 static void fast_draw_8(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
531 CARD8 *u = (CARD8 *)dest->data;
532 CARD8 *t = (CARD8 *)src->data + x + y*src->bytes_per_line/sizeof(CARD8);
534 while (u < (CARD8 *)(dest->data + sizeof(CARD8)*dest->height
535 *dest->bytes_per_line/sizeof(CARD8))) {
536 *u++ = t[*distort_matrix++];
540 static void fast_draw_16(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
542 CARD16 *u = (CARD16 *)dest->data;
543 CARD16 *t = (CARD16 *)src->data + x + y*src->bytes_per_line/sizeof(CARD16);
545 while (u < (CARD16 *)(dest->data + sizeof(CARD16)*dest->height
546 *dest->bytes_per_line/sizeof(CARD16))) {
547 *u++ = t[*distort_matrix++];
551 static void fast_draw_32(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
553 CARD32 *u = (CARD32 *)dest->data;
554 CARD32 *t = (CARD32 *)src->data + x + y*src->bytes_per_line/sizeof(CARD32);
556 while (u < (CARD32 *)(dest->data + sizeof(CARD32)*dest->height
557 *dest->bytes_per_line/sizeof(CARD32))) {
558 *u++ = t[*distort_matrix++];
562 static void generic_draw(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
565 for (i = 0; i < dest->width; i++)
566 for (j = 0; j < dest->height; j++)
567 if (st->from[i][j][0] + x >= 0 &&
568 st->from[i][j][0] + x < src->width &&
569 st->from[i][j][1] + y >= 0 &&
570 st->from[i][j][1] + y < src->height)
571 XPutPixel(dest, i, j,
573 st->from[i][j][0] + x,
574 st->from[i][j][1] + y));
577 /* generate an XImage of from[][][] and draw it on the screen */
578 static void plain_draw(struct state *st, int k)
580 if (st->xy_coo[k].x+2*st->radius+st->speed+2 > st->orig_map->width ||
581 st->xy_coo[k].y+2*st->radius+st->speed+2 > st->orig_map->height)
584 st->draw_routine(st, st->orig_map, st->buffer_map, st->xy_coo[k].x, st->xy_coo[k].y, st->fast_from);
586 # ifdef HAVE_XSHM_EXTENSION
588 XShmPutImage(st->dpy, st->window, st->gc, st->buffer_map, 0, 0, st->xy_coo[k].x, st->xy_coo[k].y,
589 2*st->radius+st->speed+2, 2*st->radius+st->speed+2, False);
594 XPutImage(st->dpy, st->window, st->gc, st->buffer_map, 0, 0, st->xy_coo[k].x, st->xy_coo[k].y,
595 2*st->radius+st->speed+2, 2*st->radius+st->speed+2);
600 /* generate an XImage from the reflect algoritm submitted by
601 * Randy Zack <randy@acucorp.com>
602 * draw really got too big and ugly so I split it up
603 * it should be possible to use the from[][] to speed it up
604 * (once I figure out the algorithm used :)
606 static void reflect_draw(struct state *st, int k)
610 int ly, lysq, lx, ny, dist, rsq = st->radius * st->radius;
612 cx = cy = st->radius;
613 if (st->xy_coo[k].ymove > 0)
615 if (st->xy_coo[k].xmove > 0)
618 for(i = 0 ; i < 2*st->radius+st->speed+2; i++) {
621 ny = st->xy_coo[k].y + i;
622 if (ny >= st->orig_map->height) ny = st->orig_map->height-1;
623 for(j = 0 ; j < 2*st->radius+st->speed+2 ; j++) {
625 dist = lx * lx + lysq;
627 ly < -st->radius || ly > st->radius ||
628 lx < -st->radius || lx > st->radius)
629 XPutPixel( st->buffer_map, j, i,
630 XGetPixel( st->orig_map, st->xy_coo[k].x + j, ny ));
632 XPutPixel( st->buffer_map, j, i, st->black_pixel );
634 int x = st->xy_coo[k].x + cx + (lx * rsq / dist);
635 int y = st->xy_coo[k].y + cy + (ly * rsq / dist);
636 if (x < 0 || x >= st->xgwa.width ||
637 y < 0 || y >= st->xgwa.height)
638 XPutPixel( st->buffer_map, j, i, st->black_pixel );
640 XPutPixel( st->buffer_map, j, i,
641 XGetPixel( st->orig_map, x, y ));
646 XPutImage(st->dpy, st->window, st->gc, st->buffer_map, 0, 0, st->xy_coo[k].x, st->xy_coo[k].y,
647 2*st->radius+st->speed+2, 2*st->radius+st->speed+2);
650 /* create a new, random coordinate, that won't interfer with any other
651 * coordinates, as the drawing routines would be significantly slowed
652 * down if they were to handle serveral layers of distortions
654 static void new_rnd_coo(struct state *st, int k)
658 st->xy_coo[k].x = (random() % (st->xgwa.width-2*st->radius));
659 st->xy_coo[k].y = (random() % (st->xgwa.height-2*st->radius));
661 for (i = 0; i < st->number; i++) {
663 if ((abs(st->xy_coo[k].x - st->xy_coo[i].x) <= 2*st->radius+st->speed+2)
664 && (abs(st->xy_coo[k].y - st->xy_coo[i].y) <= 2*st->radius+st->speed+2)) {
665 st->xy_coo[k].x = (random() % (st->xgwa.width-2*st->radius));
666 st->xy_coo[k].y = (random() % (st->xgwa.height-2*st->radius));
673 /* move lens and handle bounces with walls and other lenses */
674 static void move_lense(struct state *st, int k)
678 if (st->xy_coo[k].x + 2*st->radius + st->speed + 2 >= st->xgwa.width)
679 st->xy_coo[k].xmove = -abs(st->xy_coo[k].xmove);
680 if (st->xy_coo[k].x <= st->speed)
681 st->xy_coo[k].xmove = abs(st->xy_coo[k].xmove);
682 if (st->xy_coo[k].y + 2*st->radius + st->speed + 2 >= st->xgwa.height)
683 st->xy_coo[k].ymove = -abs(st->xy_coo[k].ymove);
684 if (st->xy_coo[k].y <= st->speed)
685 st->xy_coo[k].ymove = abs(st->xy_coo[k].ymove);
687 st->xy_coo[k].x = st->xy_coo[k].x + st->xy_coo[k].xmove;
688 st->xy_coo[k].y = st->xy_coo[k].y + st->xy_coo[k].ymove;
690 /* bounce against othe lenses */
691 for (i = 0; i < st->number; i++) {
694 /* This commented test is for rectangular lenses (not currently used) and
695 * the one used is for circular ones
696 && (abs(xy_coo[k].x - xy_coo[i].x) <= 2*radius)
697 && (abs(xy_coo[k].y - xy_coo[i].y) <= 2*radius)) { */
699 && ((st->xy_coo[k].x - st->xy_coo[i].x)*(st->xy_coo[k].x - st->xy_coo[i].x)
700 + (st->xy_coo[k].y - st->xy_coo[i].y)*(st->xy_coo[k].y - st->xy_coo[i].y)
701 <= 2*st->radius*2*st->radius)) {
704 x = st->xy_coo[k].xmove;
705 y = st->xy_coo[k].ymove;
706 st->xy_coo[k].xmove = st->xy_coo[i].xmove;
707 st->xy_coo[k].ymove = st->xy_coo[i].ymove;
708 st->xy_coo[i].xmove = x;
709 st->xy_coo[i].ymove = y;
715 /* make xy_coo[k] grow/shrink */
716 static void swamp_thing(struct state *st, int k)
718 if (st->xy_coo[k].r >= st->radius)
719 st->xy_coo[k].r_change = -abs(st->xy_coo[k].r_change);
721 if (st->xy_coo[k].r <= 0) {
722 st->from = st->from_array[0];
724 st->xy_coo[k].r_change = abs(st->xy_coo[k].r_change);
726 st->xy_coo[k].r=st->xy_coo[k].r_change;
730 st->xy_coo[k].r = st->xy_coo[k].r + st->xy_coo[k].r_change;
732 if (st->xy_coo[k].r >= st->radius)
733 st->xy_coo[k].r = st->radius;
734 if (st->xy_coo[k].r <= 0)
737 st->from = st->from_array[st->xy_coo[k].r];
742 distort_draw (Display *dpy, Window window, void *closure)
744 struct state *st = (struct state *) closure;
747 if (st->img_loader) /* still loading */
749 st->img_loader = load_image_async_simple (st->img_loader, 0, 0, 0, 0, 0);
750 if (! st->img_loader) /* just finished */
751 distort_finish_loading (st);
755 for (k = 0; k < st->number; k++) {
763 distort_reshape (Display *dpy, Window window, void *closure,
764 unsigned int w, unsigned int h)
769 distort_event (Display *dpy, Window window, void *closure, XEvent *event)
775 distort_free (Display *dpy, Window window, void *closure)
777 struct state *st = (struct state *) closure;
778 XFreeGC (st->dpy, st->gc);
779 if (st->orig_map) XDestroyImage (st->orig_map);
780 if (st->buffer_map) XDestroyImage (st->buffer_map);
781 if (st->from) free (st->from);
782 if (st->fast_from) free (st->fast_from);
783 if (st->from_array) free (st->from_array);
790 static const char *distort_defaults [] = {
791 "*dontClearRoot: True",
792 "*background: Black",
793 #ifdef __sgi /* really, HAVE_READ_DISPLAY_EXTENSION */
807 #ifdef HAVE_XSHM_EXTENSION
808 "*useSHM: False", /* xshm turns out not to help. */
809 #endif /* HAVE_XSHM_EXTENSION */
813 static XrmOptionDescRec distort_options [] = {
814 { "-delay", ".delay", XrmoptionSepArg, 0 },
815 { "-radius", ".radius", XrmoptionSepArg, 0 },
816 { "-speed", ".speed", XrmoptionSepArg, 0 },
817 { "-number", ".number", XrmoptionSepArg, 0 },
819 { "-effect", ".effect", XrmoptionSepArg, 0 },
820 { "-swamp", ".effect", XrmoptionNoArg, "swamp" },
821 { "-bounce", ".effect", XrmoptionNoArg, "bounce" },
823 { "-reflect", ".reflect", XrmoptionNoArg, "True" },
824 { "-vortex", ".vortex", XrmoptionNoArg, "True" },
825 { "-magnify", ".magnify", XrmoptionNoArg, "True" },
826 { "-blackhole", ".blackhole", XrmoptionNoArg, "True" },
827 { "-slow", ".slow", XrmoptionNoArg, "True" },
828 #ifdef HAVE_XSHM_EXTENSION
829 { "-shm", ".useSHM", XrmoptionNoArg, "True" },
830 { "-no-shm", ".useSHM", XrmoptionNoArg, "False" },
831 #endif /* HAVE_XSHM_EXTENSION */
835 XSCREENSAVER_MODULE ("Distort", distort)