git.hungrycats.org Git - xscreensaver/blob - hacks/distort.c

   1 /* -*- mode: C; tab-width: 4 -*-
   2  * xscreensaver, Copyright (c) 1992-2014 Jamie Zawinski <jwz@jwz.org>
   3  *
   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
  10  * implied warranty.
  11  */
  12
  13 /* distort
  14  * by Jonas Munsin (jmunsin@iki.fi) and Jamie Zawinski <jwz@jwz.org>
  15  * TODO:
  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,
  24  *
  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
  29  *    Xlib sources.
  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
  32  *    on wood).
  33  * 08 Oct 1999 Jonas Munsin (jmunsin@iki.fi)
  34  *      Corrected several bugs causing references beyond allocated memory.
  35  */
  36
  37 #include <math.h>
  38 #include "screenhack.h"
  39 /*#include <X11/Xmd.h>*/
  40
  41 #ifdef HAVE_XSHM_EXTENSION
  42 # include "xshm.h"
  43 #endif /* HAVE_XSHM_EXTENSION */
  44
  45 #define CARD32 unsigned int
  46 #define CARD16 unsigned short
  47 #define CARD8  unsigned char
  48
  49
  50 struct coo {
  51         int x;
  52         int y;
  53         int r, r_change;
  54         int xmove, ymove;
  55 };
  56
  57 struct state {
  58   Display *dpy;
  59   Window window;
  60
  61   struct coo xy_coo[10];
  62
  63   int delay, radius, speed, number, blackhole, vortex, magnify, reflect, slow;
  64   int duration;
  65   time_t start_time;
  66
  67   XWindowAttributes xgwa;
  68   GC gc;
  69   unsigned long black_pixel;
  70
  71   XImage *orig_map, *buffer_map;
  72   unsigned long *buffer_map_cache;
  73
  74   int ***from;
  75   int ****from_array;
  76   int *fast_from;
  77
  78   int bpp_size;
  79
  80 #ifdef HAVE_XSHM_EXTENSION
  81   Bool use_shm;
  82   XShmSegmentInfo shm_info;
  83 #endif /* HAVE_XSHM_EXTENSION */
  84
  85   void (*effect) (struct state *, int);
  86   void (*draw) (struct state *, int);
  87   void (*draw_routine) (struct state *st, XImage *, XImage *, int, int, int *);
  88
  89   async_load_state *img_loader;
  90 };
  91
  92
  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);
  99
 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 *);
 104
 105
 106 static void distort_finish_loading (struct state *);
 107
 108 static void
 109 distort_reset (struct state *st)
 110 {
 111     char *s;
 112     int i;
 113
 114     st->start_time = 0;
 115
 116         XGetWindowAttributes (st->dpy, st->window, &st->xgwa);
 117
 118         st->delay = get_integer_resource(st->dpy, "delay", "Integer");
 119     st->duration = get_integer_resource (st->dpy, "duration", "Seconds");
 120         st->radius = get_integer_resource(st->dpy, "radius", "Integer");
 121         st->speed = get_integer_resource(st->dpy, "speed", "Integer");
 122         st->number = get_integer_resource(st->dpy, "number", "Integer");
 123
 124         st->blackhole = get_boolean_resource(st->dpy, "blackhole", "Boolean");
 125         st->vortex = get_boolean_resource(st->dpy, "vortex", "Boolean");
 126         st->magnify = get_boolean_resource(st->dpy, "magnify", "Boolean");
 127         st->reflect = get_boolean_resource(st->dpy, "reflect", "Boolean");
 128         st->slow = get_boolean_resource(st->dpy, "slow", "Boolean");
 129
 130     if (st->delay < 0) st->delay = 0;
 131     if (st->duration < 1) st->duration = 1;
 132
 133     st->effect = NULL;
 134     s = get_string_resource(st->dpy, "effect", "String");
 135         if (s && !strcasecmp(s,"swamp"))
 136       st->effect = &swamp_thing;
 137     else if (s && !strcasecmp(s,"bounce"))
 138       st->effect = &move_lense;
 139     else if (s && !strcasecmp(s,"none"))
 140       ;
 141     else if (s && *s)
 142       fprintf(stderr,"%s: bogus effect: %s\n", progname, s);
 143
 144         if (st->effect == NULL && st->radius == 0 && st->speed == 0 && st->number == 0
 145                 && !st->blackhole && !st->vortex && !st->magnify && !st->reflect) {
 146 /* if no cmdline options are given, randomly choose one of:
 147  * -radius 125 -number 4 -speed 1 -bounce
 148  * -radius 125 -number 4 -speed 1 -blackhole
 149  * -radius 125 -number 4 -speed 1 -vortex
 150  * -radius 125 -number 4 -speed 1 -vortex -magnify
 151  * -radius 125 -number 4 -speed 1 -vortex -magnify -blackhole
 152  * -radius 250 -number 1 -speed 2 -bounce
 153  * -radius 250 -number 1 -speed 2 -blackhole
 154  * -radius 250 -number 1 -speed 2 -vortex
 155  * -radius 250 -number 1 -speed 2 -vortex -magnify
 156  * -radius 250 -number 1 -speed 2 -vortex -magnify -blackhole
 157  * -radius 80 -number 1 -speed 2 -reflect
 158  * -radius 125 -number 3 -speed 2 -reflect
 159  * jwz: not these
 160  *   -radius 125 -number 4 -speed 2 -swamp
 161  *   -radius 125 -number 4 -speed 2 -swamp -blackhole
 162  *   -radius 125 -number 4 -speed 2 -swamp -vortex
 163  *   -radius 125 -number 4 -speed 2 -swamp -vortex -magnify
 164  *   -radius 125 -number 4 -speed 2 -swamp -vortex -magnify -blackhole
 165  */
 166
 167                 i = (random() % 12 /* 17 */);
 168
 169                 st->draw = &plain_draw;
 170
 171                 switch (i) {
 172                         case 0:
 173                                 st->radius=125;st->number=4;st->speed=1;
 174                                 st->effect=&move_lense;break;
 175                         case 1:
 176                                 st->radius=125;st->number=4;st->speed=1;st->blackhole=1;
 177                                 st->effect=&move_lense;break;
 178                         case 2:
 179                                 st->radius=125;st->number=4;st->speed=1;st->vortex=1;
 180                                 st->effect=&move_lense;break;
 181                         case 3:
 182                                 st->radius=125;st->number=4;st->speed=1;st->vortex=1;st->magnify=1;
 183                                 st->effect=&move_lense;break;
 184                         case 4:
 185                                 st->radius=125;st->number=4;st->speed=1;st->vortex=1;st->magnify=1;st->blackhole=1;
 186                                 st->effect=&move_lense;break;
 187                         case 5:
 188                                 st->radius=250;st->number=1;st->speed=2;
 189                                 st->effect=&move_lense;break;
 190                         case 6:
 191                                 st->radius=250;st->number=1;st->speed=2;st->blackhole=1;
 192                                 st->effect=&move_lense;break;
 193                         case 7:
 194                                 st->radius=250;st->number=1;st->speed=2;st->vortex=1;
 195                                 st->effect=&move_lense;break;
 196                         case 8:
 197                                 st->radius=250;st->number=1;st->speed=2;st->vortex=1;st->magnify=1;
 198                                 st->effect=&move_lense;break;
 199                         case 9:
 200                                 st->radius=250;st->number=1;st->speed=2;st->vortex=1;st->magnify=1;st->blackhole=1;
 201                                 st->effect=&move_lense;break;
 202
 203                         case 10:
 204                                 st->radius=80;st->number=1;st->speed=2;st->reflect=1;
 205                                 st->draw = &reflect_draw;st->effect = &move_lense;break;
 206                         case 11:
 207                                 st->radius=125;st->number=4;st->speed=2;st->reflect=1;
 208                                 st->draw = &reflect_draw;st->effect = &move_lense;break;
 209
 210 #if 0 /* jwz: not these */
 211                         case 12:
 212                                 st->radius=125;st->number=4;st->speed=2;
 213                                 effect=&swamp_thing;break;
 214                         case 13:
 215                                 st->radius=125;st->number=4;st->speed=2;st->blackhole=1;
 216                                 effect=&swamp_thing;break;
 217                         case 14:
 218                                 st->radius=125;st->number=4;st->speed=2;st->vortex=1;
 219                                 effect=&swamp_thing;break;
 220                         case 15:
 221                                 st->radius=125;st->number=4;st->speed=2;st->vortex=1;st->magnify=1;
 222                                 effect=&swamp_thing;break;
 223                         case 16:
 224                                 st->radius=125;st->number=4;st->speed=2;st->vortex=1;st->magnify=1;st->blackhole=1;
 225                                 effect=&swamp_thing;break;
 226 #endif
 227
 228             default:
 229                 abort(); break;
 230                 }
 231         }
 232
 233     /* never allow the radius to be too close to the min window dimension
 234      */
 235     if (st->radius > st->xgwa.width  * 0.3) st->radius = st->xgwa.width  * 0.3;
 236     if (st->radius > st->xgwa.height * 0.3) st->radius = st->xgwa.height * 0.3;
 237
 238
 239     /* -swamp mode consumes vast amounts of memory, proportional to radius --
 240        so throttle radius to a small-ish value (60 => ~30MB.)
 241      */
 242     if (st->effect == &swamp_thing && st->radius > 60)
 243       st->radius = 60;
 244
 245         if (st->delay < 0)
 246                 st->delay = 0;
 247         if (st->radius <= 0)
 248                 st->radius = 60;
 249         if (st->speed <= 0)
 250                 st->speed = 2;
 251         if (st->number <= 0)
 252                 st->number=1;
 253         if (st->number >= 10)
 254                 st->number=1;
 255         if (st->effect == NULL)
 256                 st->effect = &move_lense;
 257         if (st->reflect) {
 258                 st->draw = &reflect_draw;
 259                 st->effect = &move_lense;
 260         }
 261         if (st->draw == NULL)
 262                 st->draw = &plain_draw;
 263 }
 264
 265 static void *
 266 distort_init (Display *dpy, Window window)
 267 {
 268   struct state *st = (struct state *) calloc (1, sizeof(*st));
 269         XGCValues gcv;
 270         long gcflags;
 271
 272     st->dpy = dpy;
 273     st->window = window;
 274
 275 #ifdef HAVE_XSHM_EXTENSION
 276         st->use_shm = get_boolean_resource(st->dpy, "useSHM", "Boolean");
 277 #endif /* HAVE_XSHM_EXTENSION */
 278
 279     distort_reset (st);
 280
 281         st->black_pixel = BlackPixelOfScreen( st->xgwa.screen );
 282
 283         gcv.function = GXcopy;
 284         gcv.subwindow_mode = IncludeInferiors;
 285         gcflags = GCFunction;
 286         if (use_subwindow_mode_p(st->xgwa.screen, st->window)) /* see grabscreen.c */
 287                 gcflags |= GCSubwindowMode;
 288         st->gc = XCreateGC (st->dpy, st->window, gcflags, &gcv);
 289
 290     st->img_loader = load_image_async_simple (0, st->xgwa.screen, st->window,
 291                                               st->window, 0, 0);
 292     st->start_time = time ((time_t) 0);
 293     return st;
 294 }
 295
 296 static void
 297 distort_finish_loading (struct state *st)
 298 {
 299     int i;
 300
 301     st->start_time = time ((time_t) 0);
 302
 303         st->buffer_map = 0;
 304         st->orig_map = XGetImage(st->dpy, st->window, 0, 0, st->xgwa.width, st->xgwa.height,
 305                                                  ~0L, ZPixmap);
 306         st->buffer_map_cache = malloc(sizeof(unsigned long)*(2*st->radius+st->speed+2)*(2*st->radius+st->speed+2));
 307
 308         if (st->buffer_map_cache == NULL) {
 309                 perror("distort");
 310                 exit(EXIT_FAILURE);
 311         }
 312
 313 # ifdef HAVE_XSHM_EXTENSION
 314
 315         if (st->use_shm)
 316           {
 317                 st->buffer_map = create_xshm_image(st->dpy, st->xgwa.visual, st->orig_map->depth,
 318                                                                            ZPixmap, 0, &st->shm_info,
 319                                                                            2*st->radius + st->speed + 2,
 320                                                                            2*st->radius + st->speed + 2);
 321                 if (!st->buffer_map)
 322                   st->use_shm = False;
 323           }
 324 # endif /* HAVE_XSHM_EXTENSION */
 325
 326         if (!st->buffer_map)
 327           {
 328                 st->buffer_map = XCreateImage(st->dpy, st->xgwa.visual,
 329                                                                   st->orig_map->depth, ZPixmap, 0, 0,
 330                                                                   2*st->radius + st->speed + 2, 2*st->radius + st->speed + 2,
 331                                                                   8, 0);
 332                 st->buffer_map->data = (char *)
 333                   calloc(st->buffer_map->height, st->buffer_map->bytes_per_line);
 334         }
 335
 336         if ((st->buffer_map->byte_order == st->orig_map->byte_order)
 337                         && (st->buffer_map->depth == st->orig_map->depth)
 338                         && (st->buffer_map->format == ZPixmap)
 339                         && (st->orig_map->format == ZPixmap)
 340                         && !st->slow) {
 341                 switch (st->orig_map->bits_per_pixel) {
 342                         case 32:
 343                                 st->draw_routine = &fast_draw_32;
 344                                 st->bpp_size = sizeof(CARD32);
 345                                 break;
 346                         case 16:
 347                                 st->draw_routine = &fast_draw_16;
 348                                 st->bpp_size = sizeof(CARD16);
 349                                 break;
 350                         case 8:
 351                                 st->draw_routine = &fast_draw_8;
 352                                 st->bpp_size = sizeof(CARD8);
 353                                 break;
 354                         default:
 355                                 st->draw_routine = &generic_draw;
 356                                 break;
 357                 }
 358         } else {
 359                 st->draw_routine = &generic_draw;
 360         }
 361         init_round_lense(st);
 362
 363         for (i = 0; i < st->number; i++) {
 364                 new_rnd_coo(st,i);
 365                 if (st->number != 1)
 366                         st->xy_coo[i].r = (i*st->radius)/(st->number-1); /* "randomize" initial */
 367                 else
 368                          st->xy_coo[i].r = 0;
 369                 st->xy_coo[i].r_change = st->speed + (i%2)*2*(-st->speed);      /* values a bit */
 370                 st->xy_coo[i].xmove = st->speed + (i%2)*2*(-st->speed);
 371                 st->xy_coo[i].ymove = st->speed + (i%2)*2*(-st->speed);
 372         }
 373 }
 374
 375 /* example: initializes a "see-trough" matrix */
 376 /* static void make_null_lense(struct state *st)
 377 {
 378         int i, j;
 379         for (i = 0; i < 2*radius+speed+2; i++) {
 380                 for (j = 0 ; j < 2*radius+speed+2 ; j++) {
 381                         from[i][j][0]=i;
 382                         from[i][j][1]=j;
 383                 }
 384         }
 385 }
 386 */
 387 static void convert(struct state *st)
 388 {
 389         int *p;
 390         int i, j;
 391         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));
 392         if (st->fast_from == NULL) {
 393                 perror("distort");
 394                 exit(EXIT_FAILURE);
 395         }
 396         p = st->fast_from;
 397         for (i = 0; i < 2*st->radius+st->speed+2; i++) {
 398                 for (j = 0; j < 2*st->radius+st->speed+2; j++) {
 399                         *(p + i + j*st->buffer_map->bytes_per_line/st->bpp_size)
 400                                 = st->from[i][j][0] + st->xgwa.width*st->from[i][j][1];
 401                         if (*(p + i + j*st->buffer_map->bytes_per_line/st->bpp_size) < 0
 402                                         || *(p + i + j*st->buffer_map->bytes_per_line/st->bpp_size) >= st->orig_map->height*st->orig_map->width) {
 403                                 *(p + i + j*st->buffer_map->bytes_per_line/st->bpp_size) = 0;
 404                         }
 405                 }
 406         }
 407 }
 408
 409 /* makes a lense with the Radius=loop and centred in
 410  * the point (radius, radius)
 411  */
 412 static void make_round_lense(struct state *st, int radius, int loop)
 413 {
 414         int i, j;
 415
 416         for (i = 0; i < 2*radius+st->speed+2; i++) {
 417                 for(j = 0; j < ((0 == st->bpp_size) ? (2*radius+st->speed+2) : (st->buffer_map->bytes_per_line/st->bpp_size)); j++) {
 418                         double r, d;
 419                         r = sqrt ((i-radius)*(i-radius)+(j-radius)*(j-radius));
 420                         if (loop == 0)
 421                           d=0.0;
 422                         else
 423                           d=r/loop;
 424
 425                         if (r < loop-1) {
 426
 427                                 if (st->vortex) { /* vortex-twist effect */
 428                                         double angle;
 429                 /* this one-line formula for getting a nice rotation angle is borrowed
 430                  * (with permission) from the whirl plugin for gimp,
 431                  * Copyright (C) 1996 Federico Mena Quintero
 432                  */
 433                 /* 5 is just a constant used because it looks good :) */
 434                                         angle = 5*(1-d)*(1-d);
 435
 436         /* Avoid atan2: DOMAIN error message */
 437                                         if ((radius-j) == 0.0 && (radius-i) == 0.0) {
 438                                                 st->from[i][j][0] = radius + cos(angle)*r;
 439                                                 st->from[i][j][1] = radius + sin(angle)*r;
 440                                         } else {
 441                                                 st->from[i][j][0] = radius +
 442                                                         cos(angle - atan2(radius-j, -(radius-i)))*r;
 443                                                 st->from[i][j][1] = radius +
 444                                                         sin(angle - atan2(radius-j, -(radius-i)))*r;
 445                                         }
 446                                         if (st->magnify) {
 447                                                 r = sin(d*M_PI_2);
 448                                                 if (st->blackhole && r != 0) /* blackhole effect */
 449                                                         r = 1/r;
 450                                                 st->from[i][j][0] = radius + (st->from[i][j][0]-radius)*r;
 451                                                 st->from[i][j][1] = radius + (st->from[i][j][1]-radius)*r;
 452                                         }
 453                                 } else { /* default is to magnify */
 454                                         r = sin(d*M_PI_2);
 455
 456         /* raising r to different power here gives different amounts of
 457          * distortion, a negative value sucks everything into a black hole
 458          */
 459                                 /*      r = r*r; */
 460                                         if (st->blackhole && r != 0) /* blackhole effect */
 461                                                 r = 1/r;
 462                                                                         /* bubble effect (and blackhole) */
 463                                         st->from[i][j][0] = radius + (i-radius)*r;
 464                                         st->from[i][j][1] = radius + (j-radius)*r;
 465                                 }
 466                         } else { /* not inside loop */
 467                                 st->from[i][j][0] = i;
 468                                 st->from[i][j][1] = j;
 469                         }
 470                 }
 471         }
 472
 473         /* this is really just a quick hack to keep both the compability mode with all depths and still
 474          * allow the custom optimized draw routines with the minimum amount of work */
 475         if (0 != st->bpp_size) {
 476                 convert(st);
 477         }
 478 }
 479
 480 #ifndef EXIT_FAILURE
 481 # define EXIT_FAILURE -1
 482 #endif
 483
 484 static void allocate_lense(struct state *st)
 485 {
 486         int i, j;
 487         int s = ((0 != st->bpp_size) ? (st->buffer_map->bytes_per_line/st->bpp_size) : (2*st->radius+st->speed+2));
 488         /* maybe this should be redone so that from[][][] is in one block;
 489          * then pointers could be used instead of arrays in some places (and
 490          * maybe give a speedup - maybe also consume less memory)
 491          */
 492         st->from = (int ***)malloc(s*sizeof(int **));
 493         if (st->from == NULL) {
 494                 perror("distort");
 495                 exit(EXIT_FAILURE);
 496         }
 497         for (i = 0; i < s; i++) {
 498                 st->from[i] = (int **)malloc((2*st->radius+st->speed+2) * sizeof(int *));
 499                 if (st->from[i] == NULL) {
 500                         perror("distort");
 501                         exit(EXIT_FAILURE);
 502                 }
 503                 for (j = 0; j < s; j++) {
 504                         st->from[i][j] = (int *)malloc(2 * sizeof(int));
 505                         if (st->from[i][j] == NULL) {
 506                                 perror("distort");
 507                                 exit(EXIT_FAILURE);
 508                         }
 509                 }
 510         }
 511 }
 512
 513 /* from_array in an array containing precalculated from matrices,
 514  * this is a double faced mem vs speed trade, it's faster, but eats
 515  * _a lot_ of mem for large radius (is there a bug here? I can't see it)
 516  */
 517 static void init_round_lense(struct state *st)
 518 {
 519         int k;
 520
 521         if (st->effect == &swamp_thing) {
 522                 st->from_array = (int ****)malloc((st->radius+1)*sizeof(int ***));
 523                 for (k=0; k <= st->radius; k++) {
 524                         allocate_lense(st);
 525                         make_round_lense(st, st->radius, k);
 526                         st->from_array[k] = st->from;
 527                 }
 528         } else { /* just allocate one from[][][] */
 529                 allocate_lense(st);
 530                 make_round_lense(st, st->radius,st->radius);
 531         }
 532 }
 533
 534 /* If fast_draw_8, fast_draw_16 or fast_draw_32 are to be used, the following properties
 535  * of the src and dest XImages must hold (otherwise the generic, slooow, method provided
 536  * by X is to be used):
 537  *      src->byte_order == dest->byte_order
 538  *      src->format == ZPixmap && dest->format == ZPixmap
 539  *      src->depth == dest->depth == the depth the function in question asumes
 540  * x and y is the coordinates in src from where to cut out the image from,
 541  * distort_matrix is a precalculated array of how to distort the matrix
 542  */
 543
 544 static void fast_draw_8(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
 545 {
 546         CARD8 *u = (CARD8 *)dest->data;
 547         CARD8 *t = (CARD8 *)src->data + x + y*src->bytes_per_line/sizeof(CARD8);
 548
 549         while (u < (CARD8 *)(dest->data + sizeof(CARD8)*dest->height
 550                                 *dest->bytes_per_line/sizeof(CARD8))) {
 551                 *u++ = t[*distort_matrix++];
 552         }
 553 }
 554
 555 static void fast_draw_16(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
 556 {
 557         CARD16 *u = (CARD16 *)dest->data;
 558         CARD16 *t = (CARD16 *)src->data + x + y*src->bytes_per_line/sizeof(CARD16);
 559
 560         while (u < (CARD16 *)(dest->data + sizeof(CARD16)*dest->height
 561                                 *dest->bytes_per_line/sizeof(CARD16))) {
 562                 *u++ = t[*distort_matrix++];
 563         }
 564 }
 565
 566 static void fast_draw_32(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
 567 {
 568         CARD32 *u = (CARD32 *)dest->data;
 569         CARD32 *t = (CARD32 *)src->data + x + y*src->bytes_per_line/sizeof(CARD32);
 570
 571         while (u < (CARD32 *)(dest->data + sizeof(CARD32)*dest->height
 572                                 *dest->bytes_per_line/sizeof(CARD32))) {
 573                 *u++ = t[*distort_matrix++];
 574         }
 575 }
 576
 577 static void generic_draw(struct state *st, XImage *src, XImage *dest, int x, int y, int *distort_matrix)
 578 {
 579         int i, j;
 580         for (i = 0; i < dest->width; i++)
 581                 for (j = 0; j < dest->height; j++)
 582                         if (st->from[i][j][0] + x >= 0 &&
 583                                         st->from[i][j][0] + x < src->width &&
 584                                         st->from[i][j][1] + y >= 0 &&
 585                                         st->from[i][j][1] + y < src->height)
 586                                 XPutPixel(dest, i, j,
 587                                                 XGetPixel(src,
 588                                                         st->from[i][j][0] + x,
 589                                                         st->from[i][j][1] + y));
 590 }
 591
 592 /* generate an XImage of from[][][] and draw it on the screen */
 593 static void plain_draw(struct state *st, int k)
 594 {
 595         if (st->xy_coo[k].x+2*st->radius+st->speed+2 > st->orig_map->width ||
 596                         st->xy_coo[k].y+2*st->radius+st->speed+2 > st->orig_map->height)
 597                 return;
 598
 599         st->draw_routine(st, st->orig_map, st->buffer_map, st->xy_coo[k].x, st->xy_coo[k].y, st->fast_from);
 600
 601 # ifdef HAVE_XSHM_EXTENSION
 602         if (st->use_shm)
 603                 XShmPutImage(st->dpy, st->window, st->gc, st->buffer_map, 0, 0, st->xy_coo[k].x, st->xy_coo[k].y,
 604                                 2*st->radius+st->speed+2, 2*st->radius+st->speed+2, False);
 605         else
 606
 607         if (!st->use_shm)
 608 # endif
 609                 XPutImage(st->dpy, st->window, st->gc, st->buffer_map, 0, 0, st->xy_coo[k].x, st->xy_coo[k].y,
 610                                 2*st->radius+st->speed+2, 2*st->radius+st->speed+2);
 611
 612 }
 613
 614
 615 /* generate an XImage from the reflect algoritm submitted by
 616  * Randy Zack <randy@acucorp.com>
 617  * draw really got too big and ugly so I split it up
 618  * it should be possible to use the from[][] to speed it up
 619  * (once I figure out the algorithm used :)
 620  */
 621 static void reflect_draw(struct state *st, int k)
 622 {
 623         int i, j;
 624         int     cx, cy;
 625         int     ly, lysq, lx, ny, dist, rsq = st->radius * st->radius;
 626
 627         cx = cy = st->radius;
 628         if (st->xy_coo[k].ymove > 0)
 629                 cy += st->speed;
 630         if (st->xy_coo[k].xmove > 0)
 631                 cx += st->speed;
 632
 633         for(i = 0 ; i < 2*st->radius+st->speed+2; i++) {
 634                 ly = i - cy;
 635                 lysq = ly * ly;
 636                 ny = st->xy_coo[k].y + i;
 637                 if (ny >= st->orig_map->height) ny = st->orig_map->height-1;
 638                 for(j = 0 ; j < 2*st->radius+st->speed+2 ; j++) {
 639                         lx = j - cx;
 640                         dist = lx * lx + lysq;
 641                         if (dist > rsq ||
 642                                 ly < -st->radius || ly > st->radius ||
 643                                 lx < -st->radius || lx > st->radius)
 644                                 XPutPixel( st->buffer_map, j, i,
 645                                                    XGetPixel( st->orig_map, st->xy_coo[k].x + j, ny ));
 646                         else if (dist == 0)
 647                                 XPutPixel( st->buffer_map, j, i, st->black_pixel );
 648                         else {
 649                                 int     x = st->xy_coo[k].x + cx + (lx * rsq / dist);
 650                                 int     y = st->xy_coo[k].y + cy + (ly * rsq / dist);
 651                                 if (x < 0 || x >= st->xgwa.width ||
 652                                         y < 0 || y >= st->xgwa.height)
 653                                         XPutPixel( st->buffer_map, j, i, st->black_pixel );
 654                                 else
 655                                         XPutPixel( st->buffer_map, j, i,
 656                                                            XGetPixel( st->orig_map, x, y ));
 657                         }
 658                 }
 659         }
 660
 661         XPutImage(st->dpy, st->window, st->gc, st->buffer_map, 0, 0, st->xy_coo[k].x, st->xy_coo[k].y,
 662                         2*st->radius+st->speed+2, 2*st->radius+st->speed+2);
 663 }
 664
 665 /* create a new, random coordinate, that won't interfer with any other
 666  * coordinates, as the drawing routines would be significantly slowed
 667  * down if they were to handle serveral layers of distortions
 668  */
 669 static void new_rnd_coo(struct state *st, int k)
 670 {
 671         int i;
 672     int loop = 0;
 673
 674         st->xy_coo[k].x = (random() % (st->xgwa.width-2*st->radius));
 675         st->xy_coo[k].y = (random() % (st->xgwa.height-2*st->radius));
 676
 677         for (i = 0; i < st->number; i++) {
 678                 if (i != k) {
 679                         if ((abs(st->xy_coo[k].x - st->xy_coo[i].x) <= 2*st->radius+st->speed+2)
 680                          && (abs(st->xy_coo[k].y - st->xy_coo[i].y) <= 2*st->radius+st->speed+2)) {
 681                                 st->xy_coo[k].x = (random() % (st->xgwa.width-2*st->radius));
 682                                 st->xy_coo[k].y = (random() % (st->xgwa.height-2*st->radius));
 683                                 i=-1; /* ugly */
 684                         }
 685                 }
 686         if (loop++ > 1000) return;  /* let's not get stuck */
 687         }
 688 }
 689
 690 /* move lens and handle bounces with walls and other lenses */
 691 static void move_lense(struct state *st, int k)
 692 {
 693         int i;
 694
 695         if (st->xy_coo[k].x + 2*st->radius + st->speed + 2 >= st->xgwa.width)
 696                 st->xy_coo[k].xmove = -abs(st->xy_coo[k].xmove);
 697         if (st->xy_coo[k].x <= st->speed)
 698                 st->xy_coo[k].xmove = abs(st->xy_coo[k].xmove);
 699         if (st->xy_coo[k].y + 2*st->radius + st->speed + 2 >= st->xgwa.height)
 700                 st->xy_coo[k].ymove = -abs(st->xy_coo[k].ymove);
 701         if (st->xy_coo[k].y <= st->speed)
 702                 st->xy_coo[k].ymove = abs(st->xy_coo[k].ymove);
 703
 704         st->xy_coo[k].x = st->xy_coo[k].x + st->xy_coo[k].xmove;
 705         st->xy_coo[k].y = st->xy_coo[k].y + st->xy_coo[k].ymove;
 706
 707         /* bounce against othe lenses */
 708         for (i = 0; i < st->number; i++) {
 709                 if ((i != k)
 710
 711 /* This commented test is for rectangular lenses (not currently used) and
 712  * the one used is for circular ones
 713                 && (abs(xy_coo[k].x - xy_coo[i].x) <= 2*radius)
 714                 && (abs(xy_coo[k].y - xy_coo[i].y) <= 2*radius)) { */
 715
 716                 && ((st->xy_coo[k].x - st->xy_coo[i].x)*(st->xy_coo[k].x - st->xy_coo[i].x)
 717                   + (st->xy_coo[k].y - st->xy_coo[i].y)*(st->xy_coo[k].y - st->xy_coo[i].y)
 718                         <= 2*st->radius*2*st->radius)) {
 719
 720                         int x, y;
 721                         x = st->xy_coo[k].xmove;
 722                         y = st->xy_coo[k].ymove;
 723                         st->xy_coo[k].xmove = st->xy_coo[i].xmove;
 724                         st->xy_coo[k].ymove = st->xy_coo[i].ymove;
 725                         st->xy_coo[i].xmove = x;
 726                         st->xy_coo[i].ymove = y;
 727                 }
 728         }
 729
 730 }
 731
 732 /* make xy_coo[k] grow/shrink */
 733 static void swamp_thing(struct state *st, int k)
 734 {
 735         if (st->xy_coo[k].r >= st->radius)
 736                 st->xy_coo[k].r_change = -abs(st->xy_coo[k].r_change);
 737
 738         if (st->xy_coo[k].r <= 0) {
 739                 st->from = st->from_array[0];
 740                 st->draw(st,k);
 741                 st->xy_coo[k].r_change = abs(st->xy_coo[k].r_change);
 742                 new_rnd_coo(st,k);
 743                 st->xy_coo[k].r=st->xy_coo[k].r_change;
 744                 return;
 745         }
 746
 747         st->xy_coo[k].r = st->xy_coo[k].r + st->xy_coo[k].r_change;
 748
 749         if (st->xy_coo[k].r >= st->radius)
 750                 st->xy_coo[k].r = st->radius;
 751         if (st->xy_coo[k].r <= 0)
 752                 st->xy_coo[k].r=0;
 753
 754         st->from = st->from_array[st->xy_coo[k].r];
 755 }
 756
 757
 758 static unsigned long
 759 distort_draw (Display *dpy, Window window, void *closure)
 760 {
 761   struct state *st = (struct state *) closure;
 762   int k;
 763
 764   if (st->img_loader)   /* still loading */
 765     {
 766       st->img_loader = load_image_async_simple (st->img_loader, 0, 0, 0, 0, 0);
 767       if (! st->img_loader) {  /* just finished */
 768         distort_finish_loading (st);
 769       }
 770       return st->delay;
 771     }
 772
 773   if (!st->img_loader &&
 774       st->start_time + st->duration < time ((time_t) 0)) {
 775     st->img_loader = load_image_async_simple (0, st->xgwa.screen, st->window,
 776                                               st->window, 0, 0);
 777     return st->delay;
 778   }
 779
 780   for (k = 0; k < st->number; k++) {
 781     st->effect(st,k);
 782     st->draw(st,k);
 783   }
 784   return st->delay;
 785 }
 786
 787 static void
 788 distort_reshape (Display *dpy, Window window, void *closure,
 789                  unsigned int w, unsigned int h)
 790 {
 791   struct state *st = (struct state *) closure;
 792   XGetWindowAttributes (st->dpy, st->window, &st->xgwa);
 793   /* XClearWindow (dpy, window); */
 794   /* Why doesn't this work? */
 795   if (st->orig_map)  /* created in distort_finish_loading, might be early */
 796     XPutImage (st->dpy, st->window, st->gc, st->orig_map,
 797                0, 0, st->orig_map->width, st->orig_map->height, 0, 0);
 798 }
 799
 800 static Bool
 801 distort_event (Display *dpy, Window window, void *closure, XEvent *event)
 802 {
 803   struct state *st = (struct state *) closure;
 804   if (screenhack_event_helper (dpy, window, event))
 805     {
 806       distort_reset(st);
 807       return True;
 808     }
 809   return False;
 810 }
 811
 812 static void
 813 distort_free (Display *dpy, Window window, void *closure)
 814 {
 815   struct state *st = (struct state *) closure;
 816   XFreeGC (st->dpy, st->gc);
 817   if (st->orig_map) XDestroyImage (st->orig_map);
 818   if (st->buffer_map) XDestroyImage (st->buffer_map);
 819   if (st->from) free (st->from);
 820   if (st->fast_from) free (st->fast_from);
 821   if (st->from_array) free (st->from_array);
 822   free (st);
 823 }
 824
 825
 826 \f
 827
 828 static const char *distort_defaults [] = {
 829         "*dontClearRoot:                True",
 830         "*background:                   Black",
 831     "*fpsSolid:                         true",
 832 #ifdef __sgi    /* really, HAVE_READ_DISPLAY_EXTENSION */
 833         "*visualID:                     Best",
 834 #endif
 835
 836         "*delay:                        20000",
 837     "*duration:                 120",
 838         "*radius:                       0",
 839         "*speed:                        0",
 840         "*number:                       0",
 841         "*slow:                         False",
 842         "*vortex:                       False",
 843         "*magnify:                      False",
 844         "*reflect:                      False",
 845         "*blackhole:            False",
 846         "*effect:                   none",
 847 #ifdef HAVE_XSHM_EXTENSION
 848         "*useSHM:                       False",         /* xshm turns out not to help. */
 849 #endif /* HAVE_XSHM_EXTENSION */
 850 #ifdef USE_IPHONE
 851   "*ignoreRotation:     True",
 852   "*rotateImages:       True",
 853 #endif
 854         0
 855 };
 856
 857 static XrmOptionDescRec distort_options [] = {
 858   { "-delay",     ".delay",       XrmoptionSepArg, 0 },
 859   { "-duration",  ".duration",    XrmoptionSepArg, 0 },
 860   { "-radius",    ".radius",      XrmoptionSepArg, 0 },
 861   { "-speed",     ".speed",       XrmoptionSepArg, 0 },
 862   { "-number",    ".number",      XrmoptionSepArg, 0 },
 863
 864   { "-effect",    ".effect",      XrmoptionSepArg, 0 },
 865   { "-swamp",     ".effect",      XrmoptionNoArg, "swamp"  },
 866   { "-bounce",    ".effect",      XrmoptionNoArg, "bounce" },
 867
 868   { "-reflect",   ".reflect",     XrmoptionNoArg, "True" },
 869   { "-vortex",    ".vortex",      XrmoptionNoArg, "True" },
 870   { "-magnify",   ".magnify",     XrmoptionNoArg, "True" },
 871   { "-blackhole", ".blackhole",   XrmoptionNoArg, "True" },
 872   { "-slow",      ".slow",        XrmoptionNoArg, "True" },
 873 #ifdef HAVE_XSHM_EXTENSION
 874   { "-shm",       ".useSHM",      XrmoptionNoArg, "True" },
 875   { "-no-shm",    ".useSHM",      XrmoptionNoArg, "False" },
 876 #endif /* HAVE_XSHM_EXTENSION */
 877   { 0, 0, 0, 0 }
 878 };
 879
 880 XSCREENSAVER_MODULE ("Distort", distort)