clients/dnd.c

   1 /*
   2  * Copyright © 2010 Kristian Høgsberg
   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 copyright
   7  * notice and this permission notice appear in supporting documentation, and
   8  * that the name of the copyright holders not be used in advertising or
   9  * publicity pertaining to distribution of the software without specific,
  10  * written prior permission.  The copyright holders make no representations
  11  * about the suitability of this software for any purpose.  It is provided "as
  12  * is" without express or implied warranty.
  13  *
  14  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  15  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  16  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  17  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  18  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  19  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  20  * OF THIS SOFTWARE.
  21  */
  22
  23 #include <stdint.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <fcntl.h>
  28 #include <unistd.h>
  29 #include <math.h>
  30 #include <sys/time.h>
  31 #include <cairo.h>
  32 #include <sys/epoll.h>
  33 #include <gdk-pixbuf/gdk-pixbuf.h>
  34
  35 #include "wayland-client.h"
  36
  37 #include "window.h"
  38 #include "cairo-util.h"
  39
  40 struct dnd {
  41         struct window *window;
  42         struct display *display;
  43         uint32_t key;
  44         struct item *items[16];
  45 };
  46
  47 struct dnd_drag {
  48         cairo_surface_t *translucent;
  49         cairo_surface_t *opaque;
  50         int hotspot_x, hotspot_y;
  51         struct dnd *dnd;
  52         struct input *input;
  53         uint32_t time;
  54         struct item *item;
  55         int x_offset, y_offset;
  56         const char *mime_type;
  57 };
  58
  59 struct dnd_offer {
  60         int refcount;
  61         struct dnd *dnd;
  62         struct wl_array types;
  63         struct task io_task;
  64         const char *drag_type;
  65         uint32_t tag;
  66         int x, y;
  67         int fd;
  68 };
  69
  70 struct item {
  71         cairo_surface_t *surface;
  72         int seed;
  73         int x, y;
  74 };
  75
  76 struct dnd_flower_message {
  77         int seed, x_offset, y_offset;
  78 };
  79
  80
  81 static const int item_width = 64;
  82 static const int item_height = 64;
  83 static const int item_padding = 16;
  84
  85 static struct item *
  86 item_create(struct display *display, int x, int y, int seed)
  87 {
  88         struct item *item;
  89         struct timeval tv;
  90
  91         item = malloc(sizeof *item);
  92         if (item == NULL)
  93                 return NULL;
  94
  95
  96         gettimeofday(&tv, NULL);
  97         item->seed = seed ? seed : tv.tv_usec;
  98         srandom(item->seed);
  99
 100         const int petal_count = 3 + random() % 5;
 101         const double r1 = 20 + random() % 10;
 102         const double r2 = 5 + random() % 12;
 103         const double u = (10 + random() % 90) / 100.0;
 104         const double v = (random() % 90) / 100.0;
 105
 106         cairo_t *cr;
 107         int i;
 108         double t, dt = 2 * M_PI / (petal_count * 2);
 109         double x1, y1, x2, y2, x3, y3;
 110         struct rectangle rect;
 111
 112
 113         rect.width = item_width;
 114         rect.height = item_height;
 115         item->surface = display_create_surface(display, NULL, &rect, 0);
 116
 117         item->x = x;
 118         item->y = y;
 119
 120         cr = cairo_create(item->surface);
 121         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 122         cairo_set_source_rgba(cr, 0, 0, 0, 0);
 123         cairo_paint(cr);
 124
 125         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 126         cairo_translate(cr, item_width / 2, item_height / 2);
 127         t = random();
 128         cairo_move_to(cr, cos(t) * r1, sin(t) * r1);
 129         for (i = 0; i < petal_count; i++, t += dt * 2) {
 130                 x1 = cos(t) * r1;
 131                 y1 = sin(t) * r1;
 132                 x2 = cos(t + dt) * r2;
 133                 y2 = sin(t + dt) * r2;
 134                 x3 = cos(t + 2 * dt) * r1;
 135                 y3 = sin(t + 2 * dt) * r1;
 136
 137                 cairo_curve_to(cr,
 138                                x1 - y1 * u, y1 + x1 * u,
 139                                x2 + y2 * v, y2 - x2 * v,
 140                                x2, y2);
 141
 142                 cairo_curve_to(cr,
 143                                x2 - y2 * v, y2 + x2 * v,
 144                                x3 + y3 * u, y3 - x3 * u,
 145                                x3, y3);
 146         }
 147
 148         cairo_close_path(cr);
 149
 150         cairo_set_source_rgba(cr,
 151                               0.5 + (random() % 50) / 49.0,
 152                               0.5 + (random() % 50) / 49.0,
 153                               0.5 + (random() % 50) / 49.0,
 154                               0.5 + (random() % 100) / 99.0);
 155
 156         cairo_fill_preserve(cr);
 157
 158         cairo_set_line_width(cr, 1);
 159         cairo_set_source_rgba(cr,
 160                               0.5 + (random() % 50) / 49.0,
 161                               0.5 + (random() % 50) / 49.0,
 162                               0.5 + (random() % 50) / 49.0,
 163                               0.5 + (random() % 100) / 99.0);
 164         cairo_stroke(cr);
 165
 166         cairo_destroy(cr);
 167
 168         return item;
 169 }
 170
 171 static void
 172 dnd_draw(struct dnd *dnd)
 173 {
 174         struct rectangle allocation;
 175         cairo_t *cr;
 176         cairo_surface_t *surface;
 177         int i;
 178
 179         window_draw(dnd->window);
 180
 181         surface = window_get_surface(dnd->window);
 182         cr = cairo_create(surface);
 183         window_get_child_allocation(dnd->window, &allocation);
 184         cairo_rectangle(cr, allocation.x, allocation.y,
 185                         allocation.width, allocation.height);
 186         cairo_clip(cr);
 187         cairo_push_group(cr);
 188
 189         cairo_translate(cr, allocation.x, allocation.y);
 190         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 191         cairo_set_source_rgba(cr, 0, 0, 0, 0.8);
 192         cairo_paint(cr);
 193
 194         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 195         for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
 196                 if (!dnd->items[i])
 197                         continue;
 198                 cairo_set_source_surface(cr, dnd->items[i]->surface,
 199                                          dnd->items[i]->x, dnd->items[i]->y);
 200                 cairo_paint(cr);
 201         }
 202
 203         cairo_pop_group_to_source(cr);
 204         cairo_paint(cr);
 205         cairo_destroy(cr);
 206         cairo_surface_destroy(surface);
 207         window_flush(dnd->window);
 208 }
 209
 210 static void
 211 redraw_handler(struct window *window, void *data)
 212 {
 213         struct dnd *dnd = data;
 214
 215         dnd_draw(dnd);
 216 }
 217
 218 static void
 219 keyboard_focus_handler(struct window *window,
 220                        struct input *device, void *data)
 221 {
 222         struct dnd *dnd = data;
 223
 224         window_schedule_redraw(dnd->window);
 225 }
 226
 227 static void
 228 dnd_offer_destroy(struct dnd_offer *dnd_offer)
 229 {
 230         dnd_offer->refcount--;
 231         if (dnd_offer->refcount == 0) {
 232                 wl_array_release(&dnd_offer->types);
 233                 free(dnd_offer);
 234         }
 235 }
 236
 237 static int
 238 dnd_add_item(struct dnd *dnd, struct item *item)
 239 {
 240         int i;
 241
 242         for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
 243                 if (dnd->items[i] == 0) {
 244                         dnd->items[i] = item;
 245                         return i;
 246                 }
 247         }
 248         return -1;
 249 }
 250
 251 static struct item *
 252 dnd_get_item(struct dnd *dnd, int32_t x, int32_t y)
 253 {
 254         struct item *item;
 255         struct rectangle allocation;
 256         int i;
 257
 258         window_get_child_allocation(dnd->window, &allocation);
 259
 260         x -= allocation.x;
 261         y -= allocation.y;
 262
 263         for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
 264                 item = dnd->items[i];
 265                 if (item &&
 266                     item->x <= x && x < item->x + item_width &&
 267                     item->y <= y && y < item->y + item_height)
 268                         return item;
 269         }
 270
 271         return NULL;
 272 }
 273
 274 static void
 275 drag_target(void *data,
 276             struct wl_drag *drag, const char *mime_type)
 277 {
 278         struct dnd_drag *dnd_drag = data;
 279         struct dnd *dnd = dnd_drag->dnd;
 280         struct wl_input_device *device;
 281         cairo_surface_t *surface;
 282         struct wl_buffer *buffer;
 283
 284         fprintf(stderr, "target %s\n", mime_type);
 285         device = input_get_input_device(dnd_drag->input);
 286         dnd_drag->mime_type = mime_type;
 287         if (mime_type)
 288                 surface = dnd_drag->opaque;
 289         else
 290                 surface = dnd_drag->translucent;
 291
 292         buffer = display_get_buffer_for_surface(dnd->display, surface);
 293         wl_input_device_attach(device, dnd_drag->time, buffer,
 294                                dnd_drag->hotspot_x, dnd_drag->hotspot_y);
 295 }
 296
 297 static void
 298 drag_finish(void *data, struct wl_drag *drag, int fd)
 299 {
 300         struct dnd_drag *dnd_drag = data;
 301
 302         if (!dnd_drag->mime_type) {
 303                 dnd_add_item(dnd_drag->dnd, dnd_drag->item);
 304                 window_schedule_redraw(dnd_drag->dnd->window);
 305                 return;
 306         }
 307
 308         struct dnd_flower_message dnd_flower_message;
 309
 310
 311         dnd_flower_message.seed = dnd_drag->item->seed;
 312
 313         dnd_flower_message.x_offset = dnd_drag->x_offset;
 314         dnd_flower_message.y_offset = dnd_drag->y_offset;
 315
 316         fprintf(stderr, "got 'finish', fd %d, sending dnd_flower_message\n", fd);
 317
 318         write(fd, &dnd_flower_message, sizeof dnd_flower_message);
 319         close(fd);
 320
 321         /* The 'finish' event marks the end of the session on the drag
 322          * source side and we need to clean up the drag object created
 323          * and the local state. */
 324         wl_drag_destroy(drag);
 325
 326         /* Destroy the item that has been dragged out */
 327         cairo_surface_destroy(dnd_drag->item->surface);
 328         free(dnd_drag->item);
 329
 330         cairo_surface_destroy(dnd_drag->translucent);
 331         cairo_surface_destroy(dnd_drag->opaque);
 332         free(dnd_drag);
 333 }
 334
 335 static void
 336 drag_reject(void *data, struct wl_drag *drag)
 337 {
 338         struct dnd_drag *dnd_drag = data;
 339
 340         dnd_add_item(dnd_drag->dnd, dnd_drag->item);
 341         window_schedule_redraw(dnd_drag->dnd->window);
 342 }
 343
 344 static const struct wl_drag_listener drag_listener = {
 345         drag_target,
 346         drag_finish,
 347         drag_reject
 348 };
 349
 350 static void
 351 drag_offer_offer(void *data,
 352                  struct wl_drag_offer *offer, const char *type)
 353 {
 354         struct dnd_offer *dnd_offer = data;
 355         char **p;
 356
 357         p = wl_array_add(&dnd_offer->types, sizeof *p);
 358         if (p)
 359                 *p = strdup(type);
 360 }
 361
 362 static void
 363 drag_offer_pointer_focus(void *data,
 364                          struct wl_drag_offer *offer,
 365                          uint32_t time, struct wl_surface *surface,
 366                          int32_t x, int32_t y,
 367                          int32_t surface_x, int32_t surface_y)
 368 {
 369         struct dnd_offer *dnd_offer = data;
 370         struct window *window;
 371         char **p, **end;
 372
 373         /* The last event in a dnd session is pointer_focus with a
 374          * NULL surface, whether or not we get the drop event.  We
 375          * need to clean up the dnd_offer proxy and whatever state we
 376          * allocated. */
 377         if (!surface) {
 378                 fprintf(stderr, "pointer focus NULL, session over\n");
 379                 wl_drag_offer_destroy(offer);
 380                 dnd_offer_destroy(dnd_offer);
 381                 return;
 382         }
 383
 384         fprintf(stderr, "drag pointer focus %p\n", surface);
 385         fprintf(stderr, "offered types:\n");
 386         end = dnd_offer->types.data + dnd_offer->types.size;
 387         for (p = dnd_offer->types.data; p < end; p++)
 388                 fprintf(stderr, "\%s\n", *p);
 389
 390         window = wl_surface_get_user_data(surface);
 391         dnd_offer->dnd = window_get_user_data(window);
 392
 393         if (!dnd_get_item(dnd_offer->dnd, surface_x, surface_y)) {
 394                 wl_drag_offer_accept(offer, time, "application/x-wayland-dnd-flower");
 395                 dnd_offer->drag_type = "application/x-wayland-dnd-flower";
 396                 dnd_offer->x = surface_x;
 397                 dnd_offer->y = surface_y;
 398         } else {
 399                 wl_drag_offer_accept(offer, time, NULL);
 400                 dnd_offer->drag_type = NULL;
 401         }
 402 }
 403
 404 static void
 405 drag_offer_motion(void *data,
 406                   struct wl_drag_offer *offer, uint32_t time,
 407                   int32_t x, int32_t y, int32_t surface_x, int32_t surface_y)
 408 {
 409         struct dnd_offer *dnd_offer = data;
 410
 411         if (!dnd_get_item(dnd_offer->dnd, surface_x, surface_y)) {
 412                 fprintf(stderr, "drag offer motion %d, %d, accepting\n",
 413                         surface_x, surface_y);
 414                 wl_drag_offer_accept(offer, time, "application/x-wayland-dnd-flower");
 415                 dnd_offer->drag_type = "application/x-wayland-dnd-flower";
 416                 dnd_offer->x = surface_x;
 417                 dnd_offer->y = surface_y;
 418         } else {
 419                 fprintf(stderr, "drag offer motion %d, %d, declining\n",
 420                         surface_x, surface_y);
 421                 wl_drag_offer_accept(offer, time, NULL);
 422                 dnd_offer->drag_type = NULL;
 423         }
 424 }
 425
 426 static void
 427 drop_io_func(struct task *task, uint32_t events)
 428 {
 429         struct dnd_offer *dnd_offer =
 430                 container_of(task, struct dnd_offer, io_task);
 431         struct dnd *dnd = dnd_offer->dnd;
 432         struct dnd_flower_message dnd_flower_message;
 433         unsigned int len;
 434         struct item *item;
 435
 436         len = read(dnd_offer->fd,
 437                    &dnd_flower_message, sizeof dnd_flower_message);
 438         fprintf(stderr, "read %d bytes\n", len);
 439
 440         close(dnd_offer->fd);
 441
 442         item = item_create(dnd->display,
 443                            dnd_offer->x - dnd_flower_message.x_offset - 26,
 444                            dnd_offer->y - dnd_flower_message.y_offset - 66,
 445                            dnd_flower_message.seed);
 446
 447         dnd_add_item(dnd, item);
 448         window_schedule_redraw(dnd->window);
 449
 450         dnd_offer_destroy(dnd_offer);
 451 }
 452
 453 static void
 454 drag_offer_drop(void *data, struct wl_drag_offer *offer)
 455 {
 456         struct dnd_offer *dnd_offer = data;
 457         int p[2];
 458
 459         if (!dnd_offer->drag_type) {
 460                 fprintf(stderr, "got 'drop', but no target\n");
 461                 wl_drag_offer_reject(offer);
 462                 return;
 463         }
 464
 465         fprintf(stderr, "got 'drop', sending write end of pipe\n");
 466
 467         dnd_offer->refcount++;
 468         pipe(p);
 469         wl_drag_offer_receive(offer, p[1]);
 470         close(p[1]);
 471
 472         dnd_offer->io_task.run = drop_io_func;
 473         dnd_offer->fd = p[0];
 474         display_watch_fd(dnd_offer->dnd->display,
 475                          p[0], EPOLLIN, &dnd_offer->io_task);
 476 }
 477
 478 static const struct wl_drag_offer_listener drag_offer_listener = {
 479         drag_offer_offer,
 480         drag_offer_pointer_focus,
 481         drag_offer_motion,
 482         drag_offer_drop,
 483 };
 484
 485 static void
 486 global_handler(struct wl_display *display, uint32_t id,
 487                const char *interface, uint32_t version, void *data)
 488 {
 489         struct wl_drag_offer *offer;
 490         struct dnd_offer *dnd_offer;
 491
 492         if (strcmp(interface, "wl_drag_offer") != 0)
 493                 return;
 494
 495         offer = wl_display_bind(display, id, &wl_drag_offer_interface);
 496
 497         dnd_offer = malloc(sizeof *dnd_offer);
 498         if (dnd_offer == NULL)
 499                 return;
 500
 501         dnd_offer->refcount = 1;
 502
 503         wl_drag_offer_add_listener(offer, &drag_offer_listener, dnd_offer);
 504         wl_array_init(&dnd_offer->types);
 505 }
 506
 507 static cairo_surface_t *
 508 create_drag_cursor(struct dnd_drag *dnd_drag,
 509                    struct item *item, int32_t x, int32_t y, double opacity)
 510 {
 511         struct dnd *dnd = dnd_drag->dnd;
 512         cairo_surface_t *surface, *pointer;
 513         int32_t pointer_width, pointer_height, hotspot_x, hotspot_y;
 514         struct rectangle rectangle;
 515         cairo_pattern_t *pattern;
 516         cairo_t *cr;
 517
 518         pointer = display_get_pointer_surface(dnd->display,
 519                                               POINTER_DRAGGING,
 520                                               &pointer_width,
 521                                               &pointer_height,
 522                                               &hotspot_x,
 523                                               &hotspot_y);
 524
 525         rectangle.width = item_width + 2 * pointer_width;
 526         rectangle.height = item_height + 2 * pointer_height;
 527         surface = display_create_surface(dnd->display, NULL, &rectangle, 0);
 528
 529         cr = cairo_create(surface);
 530         cairo_translate(cr, pointer_width, pointer_height);
 531
 532         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 533         cairo_set_source_rgba(cr, 0, 0, 0, 0);
 534         cairo_paint(cr);
 535
 536         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 537         cairo_set_source_surface(cr, item->surface, 0, 0);
 538         pattern = cairo_pattern_create_rgba(0, 0, 0, opacity);
 539         cairo_mask(cr, pattern);
 540         cairo_pattern_destroy(pattern);
 541
 542         cairo_set_source_surface(cr, pointer,
 543                                  x - item->x - hotspot_x,
 544                                  y - item->y - hotspot_y);
 545         cairo_surface_destroy(pointer);
 546         cairo_paint(cr);
 547         /* FIXME: more cairo-gl brokeness */
 548         surface_flush_device(surface);
 549         cairo_destroy(cr);
 550
 551         dnd_drag->hotspot_x = pointer_width + x - item->x;
 552         dnd_drag->hotspot_y = pointer_height + y - item->y;
 553
 554         return surface;
 555 }
 556
 557 static void
 558 dnd_button_handler(struct window *window,
 559                    struct input *input, uint32_t time,
 560                    int button, int state, void *data)
 561 {
 562         struct dnd *dnd = data;
 563         int32_t x, y;
 564         struct item *item;
 565         struct rectangle allocation;
 566         struct dnd_drag *dnd_drag;
 567         struct wl_drag *drag;
 568         int i;
 569
 570         window_get_child_allocation(dnd->window, &allocation);
 571         input_get_position(input, &x, &y);
 572         item = dnd_get_item(dnd, x, y);
 573         x -= allocation.x;
 574         y -= allocation.y;
 575
 576         if (item && state == 1) {
 577                 fprintf(stderr, "start drag, item %p\n", item);
 578
 579                 dnd_drag = malloc(sizeof *dnd_drag);
 580                 dnd_drag->dnd = dnd;
 581                 dnd_drag->input = input;
 582                 dnd_drag->time = time;
 583                 dnd_drag->item = item;
 584                 dnd_drag->x_offset = x - item->x;
 585                 dnd_drag->y_offset = y - item->y;
 586
 587                 for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
 588                         if (item == dnd->items[i]){
 589                                 dnd->items[i] = 0;
 590                                 break;
 591                         }
 592                 }
 593
 594                 dnd_drag->opaque =
 595                         create_drag_cursor(dnd_drag, item, x, y, 1);
 596                 dnd_drag->translucent =
 597                         create_drag_cursor(dnd_drag, item, x, y, 0.2);
 598
 599                 drag = window_create_drag(window);
 600                 wl_drag_offer(drag, "application/x-wayland-dnd-flower");
 601                 window_activate_drag(drag, window, input, time);
 602                 wl_drag_add_listener(drag, &drag_listener, dnd_drag);
 603                 window_schedule_redraw(dnd->window);
 604         }
 605 }
 606
 607 static int
 608 dnd_motion_handler(struct window *window,
 609                    struct input *input, uint32_t time,
 610                    int32_t x, int32_t y,
 611                    int32_t sx, int32_t sy, void *data)
 612 {
 613         struct dnd *dnd = data;
 614         struct item *item;
 615
 616         item = dnd_get_item(dnd, sx, sy);
 617
 618         if (item)
 619                 return POINTER_HAND1;
 620         else
 621                 return POINTER_LEFT_PTR;
 622 }
 623
 624 static struct dnd *
 625 dnd_create(struct display *display)
 626 {
 627         struct dnd *dnd;
 628         int i, x, y;
 629         int32_t width, height;
 630
 631         dnd = malloc(sizeof *dnd);
 632         if (dnd == NULL)
 633                 return dnd;
 634         memset(dnd, 0, sizeof *dnd);
 635
 636         dnd->window = window_create(display, 400, 400);
 637         window_set_title(dnd->window, "Wayland Drag and Drop Demo");
 638
 639         dnd->display = display;
 640         dnd->key = 100;
 641
 642         wl_display_add_global_listener(display_get_display(display),
 643                                        global_handler, dnd);
 644
 645         for (i = 0; i < ARRAY_LENGTH(dnd->items); i++) {
 646                 x = (i % 4) * (item_width + item_padding) + item_padding;
 647                 y = (i / 4) * (item_height + item_padding) + item_padding;
 648                 if ((i ^ (i >> 2)) & 1)
 649                         dnd->items[i] = item_create(display, x, y, 0);
 650                 else
 651                         dnd->items[i] = NULL;
 652         }
 653
 654         window_set_user_data(dnd->window, dnd);
 655         window_set_redraw_handler(dnd->window, redraw_handler);
 656         window_set_keyboard_focus_handler(dnd->window,
 657                                           keyboard_focus_handler);
 658         window_set_button_handler(dnd->window,
 659                                   dnd_button_handler);
 660
 661         window_set_motion_handler(dnd->window,
 662                                   dnd_motion_handler);
 663
 664         width = 4 * (item_width + item_padding) + item_padding;
 665         height = 4 * (item_height + item_padding) + item_padding;
 666         window_set_child_size(dnd->window, width, height);
 667
 668         dnd_draw(dnd);
 669
 670         return dnd;
 671 }
 672
 673 static const GOptionEntry option_entries[] = {
 674         { NULL }
 675 };
 676
 677 int
 678 main(int argc, char *argv[])
 679 {
 680         struct display *d;
 681
 682         d = display_create(&argc, &argv, option_entries);
 683         if (d == NULL) {
 684                 fprintf(stderr, "failed to create display: %m\n");
 685                 return -1;
 686         }
 687
 688         dnd_create(d);
 689
 690         display_run(d);
 691
 692         return 0;
 693 }