src/wlt_toolkit.c

   1 /*
   2  * wlt - Toolkit Helper
   3  *
   4  * Copyright (c) 2012 David Herrmann <dh.herrmann@googlemail.com>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining
   7  * a copy of this software and associated documentation files
   8  * (the "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sublicense, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  21  * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  22  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  23  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 /*
  27  * Wayland Terminal toolkit helpers
  28  */
  29
  30 #include <errno.h>
  31 #include <fcntl.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <sys/mman.h>
  35 #include <unistd.h>
  36 #include <wayland-client.h>
  37 #include <wayland-cursor.h>
  38 #include <xkbcommon/xkbcommon.h>
  39 #include "eloop.h"
  40 #include "log.h"
  41 #include "shl_array.h"
  42 #include "shl_dlist.h"
  43 #include "shl_hook.h"
  44 #include "shl_misc.h"
  45 #include "tsm_vte.h"
  46 #include "wlt_main.h"
  47 #include "wlt_toolkit.h"
  48
  49 #define LOG_SUBSYSTEM "wlt_toolkit"
  50
  51 struct wlt_pool {
  52         struct wl_shm_pool *w_pool;
  53         size_t size;
  54         uint8_t *data;
  55 };
  56
  57 enum {
  58         STATE_INIT = 0,
  59         STATE_RUNNING,
  60         STATE_HUP,
  61 };
  62
  63 struct data_offer {
  64         unsigned long ref;
  65         struct wl_data_offer *w_offer;
  66         struct wlt_display *disp;
  67         struct shl_array *types;
  68 };
  69
  70 struct wlt_display {
  71         unsigned long ref;
  72         struct ev_eloop *eloop;
  73         struct wl_display *dp;
  74         struct ev_fd *dp_fd;
  75         struct wl_global_listener *dp_listener;
  76         struct shl_hook *listeners;
  77         unsigned int state;
  78         struct wl_registry *w_registry;
  79
  80         struct shl_dlist window_list;
  81
  82         struct wl_compositor *w_comp;
  83         struct wl_seat *w_seat;
  84         struct wl_shell *w_shell;
  85         struct wl_shm *w_shm;
  86
  87         uint32_t last_serial;
  88         uint32_t pointer_enter_serial;
  89         struct wl_pointer *w_pointer;
  90         struct wlt_window *pointer_focus;
  91
  92         uint32_t cursor_serial;
  93         unsigned int current_cursor;
  94         struct wl_surface *w_cursor_surface;
  95         struct wl_cursor_theme *cursor_theme;
  96         struct wl_cursor *cursors[WLT_CURSOR_NUM];
  97
  98         struct wl_keyboard *w_keyboard;
  99         struct xkb_context *xkb_ctx;
 100         struct xkb_keymap *xkb_keymap;
 101         struct xkb_state *xkb_state;
 102         struct wlt_window *keyboard_focus;
 103         struct ev_timer *repeat_timer;
 104         uint32_t repeat_sym;
 105         uint32_t repeat_ascii;
 106
 107         struct wl_data_device_manager *w_manager;
 108         struct wl_data_device *w_data_dev;
 109         struct data_offer *drag_offer;
 110         struct data_offer *selection_offer;
 111 };
 112
 113 struct wlt_window {
 114         unsigned long ref;
 115         struct shl_dlist list;
 116         void *data;
 117         wlt_window_close_cb close_cb;
 118         bool close_pending;
 119         struct wlt_display *disp;
 120         struct wlt_pool *pool;
 121
 122         struct wl_surface *w_surface;
 123         struct wl_shell_surface *w_shell_surface;
 124         struct wl_buffer *w_buffer;
 125
 126         bool buffer_attached;
 127         bool skip_damage;
 128         bool need_resize;
 129         bool need_frame;
 130         bool idle_pending;
 131         unsigned int new_width;
 132         unsigned int new_height;
 133         unsigned int saved_width;
 134         unsigned int saved_height;
 135         unsigned int resize_edges;
 136         bool maximized;
 137         bool fullscreen;
 138         struct wlt_shm_buffer buffer;
 139         struct wl_callback *w_frame;
 140
 141         struct shl_dlist widget_list;
 142 };
 143
 144 struct wlt_widget {
 145         struct shl_dlist list;
 146         struct wlt_window *wnd;
 147         void *data;
 148         wlt_widget_redraw_cb redraw_cb;
 149         wlt_widget_destroy_cb destroy_cb;
 150         wlt_widget_prepare_resize_cb prepare_resize_cb;
 151         wlt_widget_resize_cb resize_cb;
 152         wlt_widget_pointer_enter_cb pointer_enter_cb;
 153         wlt_widget_pointer_leave_cb pointer_leave_cb;
 154         wlt_widget_pointer_motion_cb pointer_motion_cb;
 155         wlt_widget_pointer_button_cb pointer_button_cb;
 156         wlt_widget_keyboard_cb keyboard_cb;
 157 };
 158
 159 static int wlt_pool_new(struct wlt_pool **out, struct wlt_display *disp,
 160                         size_t size)
 161 {
 162         static const char template[] = "/wlterm-shared-XXXXXX";
 163         struct wlt_pool *pool;
 164         int fd, ret;
 165         const char *path;
 166         char *name;
 167
 168         path = getenv("XDG_RUNTIME_DIR");
 169         if (!path) {
 170                 log_error("XDG_RUNTIME_DIR not set");
 171                 return -EFAULT;
 172         }
 173
 174         pool = malloc(sizeof(*pool));
 175         if (!pool)
 176                 return -ENOMEM;
 177         memset(pool, 0, sizeof(*pool));
 178         pool->size = size;
 179
 180         name = malloc(strlen(path) + sizeof(template));
 181         if (!name) {
 182                 ret = -ENOMEM;
 183                 goto err_free;
 184         }
 185         strcpy(name, path);
 186         strcat(name, template);
 187
 188         fd = mkostemp(name, O_CLOEXEC);
 189         if (fd < 0) {
 190                 log_error("cannot create temporary file %s via mkostemp() (%d): %m",
 191                           name, errno);
 192                 ret = -EFAULT;
 193                 free(name);
 194                 goto err_free;
 195         }
 196
 197         ret = unlink(name);
 198         if (ret)
 199                 log_warning("cannot unlink temporary file %s (%d): %m",
 200                             name, errno);
 201         free(name);
 202
 203         ret = ftruncate(fd, size);
 204         if (ret) {
 205                 log_error("cannot truncate temporary file to length %lu (%d): %m",
 206                           size, errno);
 207                 ret = -EFAULT;
 208                 goto err_close;
 209         }
 210
 211         pool->data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED,
 212                           fd, 0);
 213         if (pool->data == MAP_FAILED) {
 214                 log_error("cannot mmap temporary file (%d): %m", errno);
 215                 ret = -EFAULT;
 216                 goto err_close;
 217         }
 218
 219         pool->w_pool = wl_shm_create_pool(disp->w_shm, fd, size);
 220         if (!pool->w_pool) {
 221                 log_error("cannot create wayland shm pool object");
 222                 ret = -EFAULT;
 223                 goto err_map;
 224         }
 225
 226         close(fd);
 227         *out = pool;
 228         return 0;
 229
 230 err_map:
 231         munmap(pool->data, size);
 232 err_close:
 233         close(fd);
 234 err_free:
 235         free(pool);
 236         return ret;
 237 }
 238
 239 static void wlt_pool_free(struct wlt_pool *pool)
 240 {
 241         munmap(pool->data, pool->size);
 242         wl_shm_pool_destroy(pool->w_pool);
 243         free(pool);
 244 }
 245
 246 /*
 247  * These cursor-names are based on:
 248  *   https://bugs.kde.org/attachment.cgi?id=67313
 249  */
 250
 251 static char *(*cursors[])[] = {
 252         [WLT_CURSOR_NONE] = &(char*[]) {
 253                 NULL,
 254         },
 255         [WLT_CURSOR_TOP] = &(char*[]) {
 256                 "top_side",
 257                 "n-resize",
 258                 NULL,
 259         },
 260         [WLT_CURSOR_BOTTOM] = &(char*[]) {
 261                 "bottom_side",
 262                 "s-resize",
 263                 NULL,
 264         },
 265         [WLT_CURSOR_LEFT] = &(char*[]) {
 266                 "left_side",
 267                 "w-resize",
 268                 NULL,
 269         },
 270         [WLT_CURSOR_RIGHT] = &(char*[]) {
 271                 "right_side",
 272                 "e-resize",
 273                 NULL,
 274         },
 275         [WLT_CURSOR_TOP_LEFT] = &(char*[]) {
 276                 "top_left_corner",
 277                 "nw-resize",
 278                 NULL,
 279         },
 280         [WLT_CURSOR_TOP_RIGHT] = &(char*[]) {
 281                 "top_right_corner",
 282                 "ne-resize",
 283                 NULL,
 284         },
 285         [WLT_CURSOR_BOTTOM_LEFT] = &(char*[]) {
 286                 "bottom_left_corner",
 287                 "sw-resize",
 288                 NULL,
 289         },
 290         [WLT_CURSOR_BOTTOM_RIGHT] = &(char*[]) {
 291                 "bottom_right_corner",
 292                 "se-resize",
 293                 NULL,
 294         },
 295         [WLT_CURSOR_DRAGGING] = &(char*[]) {
 296                 "grabbing",
 297                 "closedhand",
 298                 "208530c400c041818281048008011002",
 299                 NULL,
 300         },
 301         [WLT_CURSOR_LEFT_PTR] = &(char*[]) {
 302                 "left_ptr",
 303                 "default",
 304                 "top_left_arrow",
 305                 "left-arrow",
 306                 NULL,
 307         },
 308         [WLT_CURSOR_IBEAM] = &(char*[]) {
 309                 "xterm",
 310                 "ibeam",
 311                 "text",
 312                 NULL,
 313         },
 314 };
 315
 316 static int load_cursors(struct wlt_display *disp)
 317 {
 318         unsigned int i, j;
 319         size_t size = sizeof(cursors) / sizeof(*cursors);
 320         struct wl_cursor *cursor;
 321
 322         disp->w_cursor_surface = wl_compositor_create_surface(disp->w_comp);
 323
 324         disp->cursor_theme = wl_cursor_theme_load(NULL, 32, disp->w_shm);
 325         if (!disp->cursor_theme) {
 326                 log_warning("cannot load curdor theme");
 327                 return -EFAULT;
 328         }
 329
 330         for (i = 0; i < WLT_CURSOR_NUM; ++i) {
 331                 cursor = NULL;
 332                 if (i < size && cursors[i]) {
 333                         for (j = 0; (*cursors[i])[j]; ++j) {
 334                                 cursor = wl_cursor_theme_get_cursor(
 335                                                         disp->cursor_theme,
 336                                                         (*cursors[i])[j]);
 337                                 if (cursor)
 338                                         break;
 339                         }
 340                 }
 341
 342                 if (!cursor && i != WLT_CURSOR_NONE)
 343                         log_warning("cannot load cursor for ID %d", i);
 344
 345                 disp->cursors[i] = cursor;
 346         }
 347
 348         return 0;
 349 }
 350
 351 static void unload_cursors(struct wlt_display *disp)
 352 {
 353         if (disp->cursor_theme)
 354                 wl_cursor_theme_destroy(disp->cursor_theme);
 355         if (disp->w_cursor_surface)
 356                 wl_surface_destroy(disp->w_cursor_surface);
 357 }
 358
 359 static void set_cursor(struct wlt_display *disp, unsigned int cursor)
 360 {
 361         bool force = false;
 362         struct wl_cursor *cur;
 363         struct wl_cursor_image *image;
 364         struct wl_buffer *buffer;
 365
 366         if (cursor >= WLT_CURSOR_NUM)
 367                 cursor = WLT_CURSOR_LEFT_PTR;
 368
 369         if (disp->pointer_enter_serial > disp->cursor_serial)
 370                 force = true;
 371
 372         if (!force && cursor == disp->current_cursor)
 373                 return;
 374
 375         disp->current_cursor = cursor;
 376         disp->cursor_serial = disp->pointer_enter_serial;
 377
 378         cur = disp->cursors[cursor];
 379         if (!cur) {
 380                 wl_pointer_set_cursor(disp->w_pointer,
 381                                       disp->pointer_enter_serial,
 382                                       NULL, 0, 0);
 383                 return;
 384         }
 385
 386         image = cur->images[0];
 387         buffer = wl_cursor_image_get_buffer(image);
 388         if (!buffer) {
 389                 log_error("cannot load buffer for cursor image");
 390                 return;
 391         }
 392
 393         wl_pointer_set_cursor(disp->w_pointer,
 394                               disp->pointer_enter_serial,
 395                               disp->w_cursor_surface,
 396                               image->hotspot_x, image->hotspot_y);
 397         wl_surface_attach(disp->w_cursor_surface, buffer, 0, 0);
 398         wl_surface_damage(disp->w_cursor_surface, 0, 0,
 399                           image->width, image->height);
 400         wl_surface_commit(disp->w_cursor_surface);
 401 }
 402
 403 static void dp_dispatch(struct wlt_display *disp, bool nonblock)
 404 {
 405         int ret;
 406
 407         errno = 0;
 408         if (nonblock)
 409                 ret = wl_display_dispatch_pending(disp->dp);
 410         else
 411                 ret = wl_display_dispatch(disp->dp);
 412
 413         if (ret == -1) {
 414                 log_error("error during wayland dispatch (%d): %m", errno);
 415                 return;
 416         } else if (errno == EAGAIN) {
 417                 ret = ev_fd_update(disp->dp_fd, EV_READABLE | EV_WRITEABLE);
 418                 if (ret)
 419                         log_warning("cannot update wayland-fd event-polling modes (%d)",
 420                                     ret);
 421         } else {
 422                 ret = ev_fd_update(disp->dp_fd, EV_READABLE);
 423                 if (ret)
 424                         log_warning("cannot update wayland-fd event-polling modes (%d)",
 425                                     ret);
 426         }
 427 }
 428
 429 static void dp_pre_event(struct ev_eloop *eloop, void *unused, void *data)
 430 {
 431         struct wlt_display *disp = data;
 432
 433         dp_dispatch(disp, true);
 434 }
 435
 436 static void dp_event(struct ev_fd *fd, int mask, void *data)
 437 {
 438         struct wlt_display *disp = data;
 439
 440         if (mask & (EV_HUP | EV_ERR)) {
 441                 log_warning("HUP/ERR on wayland socket");
 442                 disp->state = STATE_HUP;
 443                 shl_hook_call(disp->listeners, disp, (void*)WLT_DISPLAY_HUP);
 444                 ev_eloop_rm_fd(disp->dp_fd);
 445                 disp->dp_fd = NULL;
 446                 return;
 447         }
 448
 449         if (mask & EV_READABLE)
 450                 dp_dispatch(disp, false);
 451         else
 452                 dp_dispatch(disp, true);
 453 }
 454
 455 static void pointer_enter(void *data, struct wl_pointer *w_pointer,
 456                           uint32_t serial, struct wl_surface *w_surface,
 457                           wl_fixed_t x, wl_fixed_t y)
 458 {
 459         struct wlt_display *disp = data;
 460         struct shl_dlist *iter;
 461         struct wlt_window *wnd;
 462         struct wlt_widget *widget;
 463
 464         if (!w_surface)
 465                 return;
 466
 467         shl_dlist_for_each(iter, &disp->window_list) {
 468                 wnd = shl_dlist_entry(iter, struct wlt_window, list);
 469                 if (wnd->w_surface == w_surface)
 470                         break;
 471         }
 472
 473         if (iter == &disp->window_list) {
 474                 log_debug("unknown surface");
 475                 return;
 476         }
 477
 478         disp->pointer_enter_serial = serial;
 479         disp->last_serial = serial;
 480         disp->pointer_focus = wnd;
 481         shl_dlist_for_each(iter, &wnd->widget_list) {
 482                 widget = shl_dlist_entry(iter, struct wlt_widget, list);
 483                 if (widget->pointer_enter_cb)
 484                         widget->pointer_enter_cb(widget, x >> 8, y >> 8,
 485                                                  widget->data);
 486         }
 487 }
 488
 489 static void pointer_leave(void *data, struct wl_pointer *w_pointer,
 490                           uint32_t serial, struct wl_surface *w_surface)
 491 {
 492         struct wlt_display *disp = data;
 493         struct shl_dlist *iter;
 494         struct wlt_window *wnd;
 495         struct wlt_widget *widget;
 496
 497         wnd = disp->pointer_focus;
 498         disp->pointer_focus = NULL;
 499         disp->last_serial = serial;
 500
 501         if (!wnd)
 502                 return;
 503
 504         shl_dlist_for_each(iter, &wnd->widget_list) {
 505                 widget = shl_dlist_entry(iter, struct wlt_widget, list);
 506                 if (widget->pointer_leave_cb)
 507                         widget->pointer_leave_cb(widget, widget->data);
 508         }
 509 }
 510
 511 static void pointer_motion(void *data, struct wl_pointer *w_pointer,
 512                            uint32_t time, wl_fixed_t x, wl_fixed_t y)
 513 {
 514         struct wlt_display *disp = data;
 515         struct shl_dlist *iter;
 516         struct wlt_window *wnd;
 517         struct wlt_widget *widget;
 518
 519         wnd = disp->pointer_focus;
 520         if (!wnd)
 521                 return;
 522
 523         shl_dlist_for_each(iter, &wnd->widget_list) {
 524                 widget = shl_dlist_entry(iter, struct wlt_widget, list);
 525                 if (widget->pointer_motion_cb)
 526                         widget->pointer_motion_cb(widget, x >> 8, y >> 8,
 527                                                   widget->data);
 528         }
 529 }
 530
 531 static void pointer_button(void *data, struct wl_pointer *w_pointer,
 532                            uint32_t serial, uint32_t time, uint32_t button,
 533                            uint32_t state)
 534 {
 535         struct wlt_display *disp = data;
 536         struct shl_dlist *iter;
 537         struct wlt_window *wnd;
 538         struct wlt_widget *widget;
 539
 540         wnd = disp->pointer_focus;
 541         disp->last_serial = serial;
 542
 543         if (!wnd)
 544                 return;
 545
 546         shl_dlist_for_each(iter, &wnd->widget_list) {
 547                 widget = shl_dlist_entry(iter, struct wlt_widget, list);
 548                 if (widget->pointer_button_cb)
 549                         widget->pointer_button_cb(widget, button, state,
 550                                                   widget->data);
 551         }
 552 }
 553
 554 static void pointer_axis(void *data, struct wl_pointer *w_pointer,
 555                          uint32_t time, uint32_t axis, wl_fixed_t value)
 556 {
 557 }
 558
 559 static const struct wl_pointer_listener pointer_listener = {
 560         .enter = pointer_enter,
 561         .leave = pointer_leave,
 562         .motion = pointer_motion,
 563         .button = pointer_button,
 564         .axis = pointer_axis,
 565 };
 566
 567 static void keyboard_keymap(void *data, struct wl_keyboard *keyboard,
 568                             uint32_t format, int fd, uint32_t size)
 569 {
 570         struct wlt_display *disp = data;
 571         char *map;
 572
 573         if (format != WL_KEYBOARD_KEYMAP_FORMAT_XKB_V1) {
 574                 log_error("invalid keyboard format");
 575                 close(fd);
 576                 return;
 577         }
 578
 579         map = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
 580         if (map == MAP_FAILED) {
 581                 log_error("cannot mmap keyboard keymap");
 582                 close(fd);
 583                 return;
 584         }
 585
 586         disp->xkb_keymap = xkb_keymap_new_from_string(disp->xkb_ctx, map,
 587                                                       XKB_KEYMAP_FORMAT_TEXT_V1,
 588                                                       0);
 589         munmap(map, size);
 590         close(fd);
 591
 592         if (!disp->xkb_keymap) {
 593                 log_error("cannot create xkb keymap");
 594                 return;
 595         }
 596
 597         disp->xkb_state = xkb_state_new(disp->xkb_keymap);
 598         if (!disp->xkb_state) {
 599                 log_error("cannot create XKB state object");
 600                 xkb_keymap_unref(disp->xkb_keymap);
 601                 disp->xkb_keymap = NULL;
 602                 return;
 603         }
 604 }
 605
 606 static void keyboard_enter(void *data, struct wl_keyboard *keyboard,
 607                            uint32_t serial, struct wl_surface *w_surface,
 608                            struct wl_array *keys)
 609 {
 610         struct wlt_display *disp = data;
 611         struct shl_dlist *iter;
 612         struct wlt_window *wnd;
 613
 614         disp->last_serial = serial;
 615         if (!disp->xkb_state)
 616                 return;
 617
 618         if (!w_surface)
 619                 return;
 620
 621         shl_dlist_for_each(iter, &disp->window_list) {
 622                 wnd = shl_dlist_entry(iter, struct wlt_window, list);
 623                 if (wnd->w_surface == w_surface)
 624                         break;
 625         }
 626
 627         if (iter == &disp->window_list)
 628                 return;
 629
 630         disp->keyboard_focus = wnd;
 631 }
 632
 633 static void keyboard_leave(void *data, struct wl_keyboard *keyboard,
 634                            uint32_t serial, struct wl_surface *surface)
 635 {
 636         struct wlt_display *disp = data;
 637
 638         disp->last_serial = serial;
 639         disp->keyboard_focus = NULL;
 640         ev_timer_update(disp->repeat_timer, NULL);
 641 }
 642
 643 static void keyboard_key(void *data, struct wl_keyboard *keyboard,
 644                          uint32_t serial, uint32_t time, uint32_t key,
 645                          uint32_t state_w)
 646 {
 647         struct wlt_display *disp = data;
 648         struct wlt_window *wnd = disp->keyboard_focus;
 649         uint32_t code, num_syms, ascii;
 650         unsigned int mask;
 651         enum wl_keyboard_key_state state = state_w;
 652         const xkb_keysym_t *syms;
 653         xkb_keysym_t sym;
 654         struct shl_dlist *iter;
 655         struct wlt_widget *widget;
 656         struct itimerspec spec;
 657         bool handled;
 658
 659         disp->last_serial = serial;
 660         if (!disp->xkb_state)
 661                 return;
 662
 663         code = key + 8;
 664         if (!wnd)
 665                 return;
 666
 667         mask = shl_get_xkb_mods(disp->xkb_state);
 668         num_syms = xkb_state_key_get_syms(disp->xkb_state, code, &syms);
 669         ascii = shl_get_ascii(disp->xkb_state, code, syms, num_syms);
 670         sym = XKB_KEY_NoSymbol;
 671         if (num_syms == 1)
 672                 sym = syms[0];
 673
 674         handled = false;
 675         shl_dlist_for_each(iter, &wnd->widget_list) {
 676                 widget = shl_dlist_entry(iter, struct wlt_widget, list);
 677                 if (widget->keyboard_cb) {
 678                         if (widget->keyboard_cb(widget, mask, sym, ascii, state,
 679                                                 handled, widget->data))
 680                                 handled = true;
 681                 }
 682         }
 683
 684         if (state == WL_KEYBOARD_KEY_STATE_RELEASED) {
 685                 ev_timer_update(disp->repeat_timer, NULL);
 686         } else if (state == WL_KEYBOARD_KEY_STATE_PRESSED) {
 687                 disp->repeat_sym = sym;
 688                 disp->repeat_ascii = ascii;
 689                 spec.it_interval.tv_sec = 0;
 690                 spec.it_interval.tv_nsec = wlt_conf.xkb_repeat_rate * 1000000;
 691                 spec.it_value.tv_sec = 0;
 692                 spec.it_value.tv_nsec = wlt_conf.xkb_repeat_delay * 1000000;
 693                 ev_timer_update(disp->repeat_timer, &spec);
 694         }
 695 }
 696
 697 static void repeat_event(struct ev_timer *timer, uint64_t num, void *data)
 698 {
 699         struct wlt_display *disp = data;
 700         struct wlt_window *wnd = disp->keyboard_focus;
 701         struct wlt_widget *widget;
 702         struct shl_dlist *iter;
 703         unsigned int mask;
 704         bool handled;
 705
 706         if (!wnd)
 707                 return;
 708
 709         mask = shl_get_xkb_mods(disp->xkb_state);
 710         handled = false;
 711         shl_dlist_for_each(iter, &wnd->widget_list) {
 712                 widget = shl_dlist_entry(iter, struct wlt_widget, list);
 713                 if (widget->keyboard_cb) {
 714                         if (widget->keyboard_cb(widget, mask, disp->repeat_sym,
 715                                                 disp->repeat_ascii,
 716                                                 WL_KEYBOARD_KEY_STATE_PRESSED,
 717                                                 handled, widget->data))
 718                                 handled = true;
 719                 }
 720         }
 721 }
 722
 723 static void keyboard_modifiers(void *data, struct wl_keyboard *keyboard,
 724                                uint32_t serial, uint32_t mods_depressed,
 725                                uint32_t mods_latched, uint32_t mods_locked,
 726                                uint32_t group)
 727 {
 728         struct wlt_display *disp = data;
 729
 730         disp->last_serial = serial;
 731         if (!disp->xkb_state)
 732                 return;
 733
 734         xkb_state_update_mask(disp->xkb_state, mods_depressed, mods_latched,
 735                               mods_locked, 0, 0, group);
 736 }
 737
 738 static const struct wl_keyboard_listener keyboard_listener = {
 739         .keymap = keyboard_keymap,
 740         .enter = keyboard_enter,
 741         .leave = keyboard_leave,
 742         .key = keyboard_key,
 743         .modifiers = keyboard_modifiers,
 744 };
 745
 746 static void data_offer_unref(struct data_offer *offer)
 747 {
 748         unsigned int i, len;
 749
 750         if (!offer || !offer->ref || --offer->ref)
 751                 return;
 752
 753         len = shl_array_get_length(offer->types);
 754         for (i = 0; i < len; ++i)
 755                 free(*SHL_ARRAY_AT(offer->types, char*, i));
 756         shl_array_free(offer->types);
 757         wl_data_offer_destroy(offer->w_offer);
 758         free(offer);
 759 }
 760
 761 static void data_offer_offer(void *data, struct wl_data_offer *w_offer,
 762                              const char *type)
 763 {
 764         char *tmp;
 765         int ret;
 766         struct data_offer *offer = wl_data_offer_get_user_data(w_offer);
 767
 768         tmp = strdup(type);
 769         if (!tmp)
 770                 return;
 771
 772         ret = shl_array_push(offer->types, &tmp);
 773         if (ret) {
 774                 free(tmp);
 775                 return;
 776         }
 777 }
 778
 779 static const struct wl_data_offer_listener data_offer_listener = {
 780         .offer = data_offer_offer,
 781 };
 782
 783 static void data_dev_data_offer(void *data, struct wl_data_device *w_dev,
 784                                 struct wl_data_offer *w_offer)
 785 {
 786         struct data_offer *offer;
 787         struct wlt_display *disp = data;
 788         int ret;
 789
 790         offer = malloc(sizeof(*offer));
 791         if (!offer) {
 792                 wl_data_offer_destroy(w_offer);
 793                 return;
 794         }
 795         memset(offer, 0, sizeof(*offer));
 796         offer->ref = 1;
 797         offer->w_offer = w_offer;
 798         offer->disp = disp;
 799
 800         ret = shl_array_new(&offer->types, sizeof(char*), 4);
 801         if (ret) {
 802                 wl_data_offer_destroy(w_offer);
 803                 free(offer);
 804                 return;
 805         }
 806
 807         wl_data_offer_add_listener(w_offer, &data_offer_listener, offer);
 808         wl_data_offer_set_user_data(w_offer, offer);
 809 }
 810
 811 static void data_dev_enter(void *data, struct wl_data_device *w_dev,
 812                            uint32_t serial, struct wl_surface *w_surface,
 813                            wl_fixed_t x, wl_fixed_t y,
 814                            struct wl_data_offer *w_offer)
 815 {
 816         struct wlt_display *disp = data;
 817
 818         if (disp->drag_offer) {
 819                 data_offer_unref(disp->drag_offer);
 820                 disp->drag_offer = NULL;
 821         }
 822
 823         if (!w_offer)
 824                 return;
 825
 826         disp->drag_offer = wl_data_offer_get_user_data(w_offer);
 827 }
 828
 829 static void data_dev_leave(void *data, struct wl_data_device *w_dev)
 830 {
 831         struct wlt_display *disp = data;
 832
 833         if (disp->drag_offer) {
 834                 data_offer_unref(disp->drag_offer);
 835                 disp->drag_offer = NULL;
 836         }
 837 }
 838
 839 static void data_dev_motion(void *data, struct wl_data_device *w_dev,
 840                             uint32_t time, wl_fixed_t x, wl_fixed_t y)
 841 {
 842 }
 843
 844 static void data_dev_drop(void *data, struct wl_data_device *w_dev)
 845 {
 846 }
 847
 848 static void data_dev_selection(void *data, struct wl_data_device *w_dev,
 849                                struct wl_data_offer *w_offer)
 850 {
 851         struct wlt_display *disp = data;
 852
 853         if (disp->selection_offer) {
 854                 data_offer_unref(disp->selection_offer);
 855                 disp->selection_offer = NULL;
 856         }
 857
 858         if (!w_offer)
 859                 return;
 860
 861         disp->selection_offer = wl_data_offer_get_user_data(w_offer);
 862 }
 863
 864 int wlt_display_get_selection_to_fd(struct wlt_display *disp, const char *mime,
 865                                     int output_fd)
 866 {
 867         unsigned int i, num;
 868         struct data_offer *offer;
 869
 870         if (!disp || !mime)
 871                 return -EINVAL;
 872         if (!disp->selection_offer)
 873                 return -ENOENT;
 874
 875         offer = disp->selection_offer;
 876         num = shl_array_get_length(offer->types);
 877         for (i = 0; i < num; ++i) {
 878                 if (!strcmp(mime, *SHL_ARRAY_AT(offer->types, char*, i)))
 879                         break;
 880         }
 881
 882         if (i == num)
 883                 return -EAGAIN;
 884
 885         wl_data_offer_receive(offer->w_offer, mime, output_fd);
 886         return 0;
 887 }
 888
 889 int wlt_display_get_selection_fd(struct wlt_display *disp, const char *mime)
 890 {
 891         int p[2], ret;
 892
 893         if (pipe2(p, O_CLOEXEC | O_NONBLOCK))
 894                 return -EFAULT;
 895
 896         ret = wlt_display_get_selection_to_fd(disp, mime, p[1]);
 897         close(p[1]);
 898
 899         if (ret) {
 900                 close(p[0]);
 901                 return ret;
 902         }
 903
 904         return p[0];
 905 }
 906
 907 int wlt_display_new_data_source(struct wlt_display *disp,
 908                                 struct wl_data_source **out)
 909 {
 910         struct wl_data_source *src;
 911
 912         if (!disp)
 913                 return -EINVAL;
 914
 915         src = wl_data_device_manager_create_data_source(disp->w_manager);
 916         if (!src)
 917                 return -EFAULT;
 918
 919         *out = src;
 920         return 0;
 921 }
 922
 923 void wlt_display_set_selection(struct wlt_display *disp,
 924                                struct wl_data_source *selection)
 925 {
 926         if (!disp)
 927                 return;
 928
 929         wl_data_device_set_selection(disp->w_data_dev, selection,
 930                                      disp->last_serial);
 931 }
 932
 933 static const struct wl_data_device_listener data_dev_listener = {
 934         .data_offer = data_dev_data_offer,
 935         .enter = data_dev_enter,
 936         .leave = data_dev_leave,
 937         .motion = data_dev_motion,
 938         .drop = data_dev_drop,
 939         .selection = data_dev_selection,
 940 };
 941
 942 static void check_ready(struct wlt_display *disp)
 943 {
 944         if (disp->state > STATE_INIT)
 945                 return;
 946
 947         if (disp->w_comp &&
 948             disp->w_seat &&
 949             disp->w_shell &&
 950             disp->w_shm &&
 951             disp->w_pointer &&
 952             disp->w_keyboard &&
 953             disp->w_manager) {
 954                 log_debug("wayland display initialized");
 955                 load_cursors(disp);
 956
 957                 disp->w_data_dev = wl_data_device_manager_get_data_device(
 958                                                 disp->w_manager, disp->w_seat);
 959                 wl_data_device_add_listener(disp->w_data_dev,
 960                                             &data_dev_listener,
 961                                             disp);
 962
 963                 disp->state = STATE_RUNNING;
 964                 shl_hook_call(disp->listeners, disp, (void*)WLT_DISPLAY_READY);
 965         }
 966 }
 967
 968 static void seat_capabilities(void *data, struct wl_seat *seat,
 969                               enum wl_seat_capability caps)
 970 {
 971         struct wlt_display *disp = data;
 972
 973         if (caps & WL_SEAT_CAPABILITY_POINTER && !disp->w_pointer) {
 974                 disp->w_pointer = wl_seat_get_pointer(seat);
 975                 wl_pointer_add_listener(disp->w_pointer, &pointer_listener,
 976                                         disp);
 977         }
 978
 979         if (caps & WL_SEAT_CAPABILITY_KEYBOARD && !disp->w_keyboard) {
 980                 disp->w_keyboard = wl_seat_get_keyboard(seat);
 981                 wl_keyboard_add_listener(disp->w_keyboard, &keyboard_listener,
 982                                          disp);
 983         }
 984
 985         check_ready(disp);
 986 }
 987
 988 static const struct wl_seat_listener seat_listener = {
 989         .capabilities = seat_capabilities,
 990 };
 991
 992 static void dp_global(void *data, struct wl_registry *registry, uint32_t id,
 993                       const char *iface, uint32_t version)
 994 {
 995         struct wlt_display *disp = data;
 996
 997         if (!strcmp(iface, "wl_display")) {
 998                 log_debug("new wl_display global");
 999                 return;
1000         } else if (!strcmp(iface, "wl_compositor")) {
1001                 if (disp->w_comp) {
1002                         log_error("global wl_compositor advertised twice");
1003                         return;
1004                 }
1005                 disp->w_comp = wl_registry_bind(disp->w_registry,
1006                                                 id,
1007                                                 &wl_compositor_interface,
1008                                                 1);
1009                 if (!disp->w_comp) {
1010                         log_error("cannot bind wl_compositor object");
1011                         return;
1012                 }
1013         } else if (!strcmp(iface, "wl_seat")) {
1014                 if (disp->w_seat) {
1015                         log_error("global wl_seat advertised twice");
1016                         return;
1017                 }
1018                 disp->w_seat = wl_registry_bind(disp->w_registry,
1019                                                 id,
1020                                                 &wl_seat_interface,
1021                                                 1);
1022                 if (!disp->w_seat) {
1023                         log_error("cannot bind wl_seat object");
1024                         return;
1025                 }
1026
1027                 wl_seat_add_listener(disp->w_seat, &seat_listener, disp);
1028         } else if (!strcmp(iface, "wl_shell")) {
1029                 if (disp->w_shell) {
1030                         log_error("global wl_shell advertised twice");
1031                         return;
1032                 }
1033                 disp->w_shell = wl_registry_bind(disp->w_registry,
1034                                                  id,
1035                                                  &wl_shell_interface,
1036                                                  1);
1037                 if (!disp->w_shell) {
1038                         log_error("cannot bind wl_shell object");
1039                         return;
1040                 }
1041         } else if (!strcmp(iface, "wl_shm")) {
1042                 if (disp->w_shm) {
1043                         log_error("global wl_shm advertised twice");
1044                         return;
1045                 }
1046                 disp->w_shm = wl_registry_bind(disp->w_registry,
1047                                                id,
1048                                                &wl_shm_interface,
1049                                                1);
1050                 if (!disp->w_shm) {
1051                         log_error("cannot bind wl_shm object");
1052                         return;
1053                 }
1054         } else if (!strcmp(iface, "wl_data_device_manager")) {
1055                 if (disp->w_manager) {
1056                         log_error("global wl_data_device_manager advertised twice");
1057                         return;
1058                 }
1059                 disp->w_manager = wl_registry_bind(disp->w_registry,
1060                                                    id,
1061                                                    &wl_data_device_manager_interface,
1062                                                    1);
1063                 if (!disp->w_manager) {
1064                         log_error("cannot bind wl_data_device_manager_object");
1065                         return;
1066                 }
1067         } else {
1068                 log_debug("ignoring new unknown global %s", iface);
1069                 return;
1070         }
1071
1072         log_debug("new global %s", iface);
1073
1074         check_ready(disp);
1075 }
1076
1077 static const struct wl_registry_listener registry_listener = {
1078         .global = dp_global,
1079         /* TODO: handle .global_remove */
1080 };
1081
1082 int wlt_display_new(struct wlt_display **out,
1083                     struct ev_eloop *eloop)
1084 {
1085         struct wlt_display *disp;
1086         int ret, fd;
1087
1088         if (!out || !eloop)
1089                 return -EINVAL;
1090
1091         log_debug("creating new wlt-display");
1092
1093         disp = malloc(sizeof(*disp));
1094         if (!disp)
1095                 return -ENOMEM;
1096         memset(disp, 0, sizeof(*disp));
1097         disp->ref = 1;
1098         disp->eloop = eloop;
1099         shl_dlist_init(&disp->window_list);
1100
1101         ret = shl_hook_new(&disp->listeners);
1102         if (ret) {
1103                 log_error("cannot create listeners hook");
1104                 goto err_free;
1105         }
1106
1107         disp->dp = wl_display_connect(NULL);
1108         if (!disp->dp) {
1109                 log_error("cannot connect to wayland socket (%d): %m", errno);
1110                 ret = -EFAULT;
1111                 goto err_listener;
1112         }
1113
1114         fd = wl_display_get_fd(disp->dp);
1115         if (fd < 0) {
1116                 log_error("cannot retrieve wayland FD");
1117                 ret = -EFAULT;
1118                 goto err_dp;
1119         }
1120
1121         /* TODO: nonblocking wl_display doesn't work, yet. fix that upstream */
1122         /*
1123         int set;
1124         set = fcntl(fd, F_GETFL);
1125         if (set < 0) {
1126                 log_error("cannot retrieve file flags for wayland FD (%d): %m",
1127                           errno);
1128                 ret = -EFAULT;
1129                 goto err_dp;
1130         }
1131
1132         set |= O_NONBLOCK;
1133         ret = fcntl(fd, F_SETFL, set);
1134         if (ret) {
1135                 log_error("cannot set file flags for wayland FD (%d): %m",
1136                           errno);
1137                 ret = -EFAULT;
1138                 goto err_dp;
1139         }*/
1140
1141         ret = ev_eloop_new_fd(eloop,
1142                               &disp->dp_fd,
1143                               fd,
1144                               EV_READABLE,
1145                               dp_event,
1146                               disp);
1147         if (ret) {
1148                 log_error("cannot create event-fd for wayland display (%d)",
1149                           ret);
1150                 goto err_dp;
1151         }
1152
1153         ret = ev_eloop_register_pre_cb(eloop, dp_pre_event, disp);
1154         if (ret) {
1155                 log_error("cannot register pre-cb (%d)", ret);
1156                 goto err_dp_fd;
1157         }
1158
1159         ret = ev_eloop_new_timer(eloop, &disp->repeat_timer, NULL,
1160                                  repeat_event, disp);
1161         if (ret) {
1162                 log_error("cannot create repeat-timer");
1163                 goto err_pre_cb;
1164         }
1165
1166         disp->w_registry = wl_display_get_registry(disp->dp);
1167         if (!disp->w_registry) {
1168                 log_error("cannot get wayland registry object");
1169                 goto err_timer;
1170         }
1171
1172         wl_registry_add_listener(disp->w_registry, &registry_listener, disp);
1173
1174         disp->xkb_ctx = xkb_context_new(0);
1175         if (!disp->xkb_ctx) {
1176                 log_error("cannot create XKB context");
1177                 goto err_timer;
1178         }
1179
1180         log_debug("wlt-display waiting for globals...");
1181
1182         ev_eloop_ref(disp->eloop);
1183         *out = disp;
1184         return 0;
1185
1186 err_timer:
1187         ev_eloop_rm_timer(disp->repeat_timer);
1188 err_pre_cb:
1189         ev_eloop_unregister_pre_cb(disp->eloop, dp_pre_event, disp);
1190 err_dp_fd:
1191         ev_eloop_rm_fd(disp->dp_fd);
1192 err_dp:
1193         wl_display_disconnect(disp->dp);
1194 err_listener:
1195         shl_hook_free(disp->listeners);
1196 err_free:
1197         free(disp);
1198         return ret;
1199 }
1200
1201 void wlt_display_ref(struct wlt_display *disp)
1202 {
1203         if (!disp || !disp->ref)
1204                 return;
1205
1206         ++disp->ref;
1207 }
1208
1209 void wlt_display_unref(struct wlt_display *disp)
1210 {
1211         if (!disp || !disp->ref || --disp->ref)
1212                 return;
1213
1214         unload_cursors(disp);
1215         wl_display_flush(disp->dp);
1216         wl_display_disconnect(disp->dp);
1217         ev_eloop_rm_timer(disp->repeat_timer);
1218         ev_eloop_unregister_pre_cb(disp->eloop, dp_pre_event, disp);
1219         ev_eloop_rm_fd(disp->dp_fd);
1220         xkb_context_unref(disp->xkb_ctx);
1221         shl_hook_free(disp->listeners);
1222         ev_eloop_unref(disp->eloop);
1223         free(disp);
1224 }
1225
1226 int wlt_display_register_cb(struct wlt_display *disp,
1227                             wlt_display_cb cb, void *data)
1228 {
1229         if (!disp)
1230                 return -EINVAL;
1231
1232         return shl_hook_add_cast(disp->listeners, cb, data, false);
1233 }
1234
1235 void wlt_display_unregister_cb(struct wlt_display *disp,
1236                                wlt_display_cb cb, void *data)
1237 {
1238         if (!disp)
1239                 return;
1240
1241         shl_hook_rm_cast(disp->listeners, cb, data);
1242 }
1243
1244 static void shell_surface_ping(void *data, struct wl_shell_surface *s,
1245                                uint32_t serial)
1246 {
1247         wl_shell_surface_pong(s, serial);
1248 }
1249
1250 static void wlt_window_do_redraw(struct wlt_window *wnd,
1251                                  unsigned int oldw,
1252                                  unsigned int oldh)
1253 {
1254         struct shl_dlist *iter;
1255         struct wlt_widget *widget;
1256         unsigned int x, y, flags;
1257         struct wlt_rect alloc;
1258
1259         flags = 0;
1260         if (wnd->maximized)
1261                 flags |= WLT_WINDOW_MAXIMIZED;
1262         if (wnd->fullscreen)
1263                 flags |= WLT_WINDOW_FULLSCREEN;
1264
1265         alloc.x = 0;
1266         alloc.y = 0;
1267         alloc.width = wnd->buffer.width;
1268         alloc.height = wnd->buffer.height;
1269         shl_dlist_for_each(iter, &wnd->widget_list) {
1270                 widget = shl_dlist_entry(iter, struct wlt_widget, list);
1271                 if (widget->resize_cb)
1272                         widget->resize_cb(widget, flags, &alloc, widget->data);
1273         }
1274
1275         memset(wnd->buffer.data, 0,
1276                wnd->buffer.stride * wnd->buffer.height);
1277
1278         wnd->skip_damage = true;
1279         shl_dlist_for_each(iter, &wnd->widget_list) {
1280                 widget = shl_dlist_entry(iter, struct wlt_widget, list);
1281                 if (widget->redraw_cb)
1282                         widget->redraw_cb(widget, flags, widget->data);
1283         }
1284         wnd->skip_damage = false;
1285
1286         if (!wnd->buffer_attached) {
1287                 wnd->buffer_attached = true;
1288                 if (wnd->resize_edges & WL_SHELL_SURFACE_RESIZE_LEFT)
1289                         x = (int)oldw - wnd->buffer.width;
1290                 else
1291                         x = 0;
1292                 if (wnd->resize_edges & WL_SHELL_SURFACE_RESIZE_TOP)
1293                         y = (int)oldh - wnd->buffer.height;
1294                 else
1295                         y = 0;
1296                 wl_surface_attach(wnd->w_surface, wnd->w_buffer, x, y);
1297                 wnd->resize_edges = 0;
1298         }
1299
1300         wl_surface_damage(wnd->w_surface, 0, 0, wnd->buffer.width,
1301                           wnd->buffer.height);
1302         wl_surface_commit(wnd->w_surface);
1303 }
1304
1305 static int resize_window(struct wlt_window *wnd, unsigned int width,
1306                          unsigned int height)
1307 {
1308         struct shl_dlist *iter;
1309         struct wlt_widget *widget;
1310         struct wl_buffer *old_buffer = NULL;
1311         struct wlt_pool *old_pool = NULL;
1312         size_t nsize;
1313         int ret;
1314         unsigned int oldw, oldh, neww, newh, minw, minh, flags;
1315
1316         if (!width)
1317                 width = wnd->buffer.width;
1318         if (!height)
1319                 height = wnd->buffer.height;
1320
1321         if (!width || !height)
1322                 return -EINVAL;
1323
1324         flags = 0;
1325         if (wnd->maximized)
1326                 flags |= WLT_WINDOW_MAXIMIZED;
1327         if (wnd->fullscreen)
1328                 flags |= WLT_WINDOW_FULLSCREEN;
1329
1330         neww = 0;
1331         newh = 0;
1332         minw = 0;
1333         minh = 0;
1334         shl_dlist_for_each(iter, &wnd->widget_list) {
1335                 widget = shl_dlist_entry(iter, struct wlt_widget, list);
1336                 if (widget->prepare_resize_cb)
1337                         widget->prepare_resize_cb(widget,
1338                                                   flags,
1339                                                   width, height,
1340                                                   &minw, &minh,
1341                                                   &neww, &newh,
1342                                                   widget->data);
1343         }
1344
1345         if (neww)
1346                 width = neww;
1347         if (newh)
1348                 height = newh;
1349
1350         if (width == wnd->buffer.width &&
1351             height == wnd->buffer.height) {
1352                 wlt_window_do_redraw(wnd, width, height);
1353                 return 0;
1354         }
1355
1356         oldw = wnd->buffer.width;
1357         oldh = wnd->buffer.height;
1358
1359         nsize = width * height * 4;
1360         if (wnd->pool && wnd->pool->size >= nsize) {
1361                 old_buffer = wnd->w_buffer;
1362                 wnd->w_buffer = wl_shm_pool_create_buffer(wnd->pool->w_pool,
1363                                                 0, width, height,
1364                                                 width * 4,
1365                                                 WL_SHM_FORMAT_ARGB8888);
1366                 if (!wnd->w_buffer) {
1367                         log_error("cannot create wayland shm buffer");
1368                         wnd->w_buffer = old_buffer;
1369                         return -ENOMEM;
1370                 }
1371         } else {
1372                 old_pool = wnd->pool;
1373                 ret = wlt_pool_new(&wnd->pool, wnd->disp, nsize);
1374                 if (ret) {
1375                         log_error("cannot create memory pool");
1376                         wnd->pool = old_pool;
1377                         return ret;
1378                 }
1379
1380                 old_buffer = wnd->w_buffer;
1381                 wnd->w_buffer = wl_shm_pool_create_buffer(wnd->pool->w_pool,
1382                                                 0, width, height,
1383                                                 width * 4,
1384                                                 WL_SHM_FORMAT_ARGB8888);
1385                 if (!wnd->w_buffer) {
1386                         log_error("cannot create wayland shm buffer");
1387                         wnd->w_buffer = old_buffer;
1388                         wlt_pool_free(wnd->pool);
1389                         wnd->pool = old_pool;
1390                         return -ENOMEM;
1391                 }
1392         }
1393
1394         wnd->buffer.data = wnd->pool->data;
1395         wnd->buffer.width = width;
1396         wnd->buffer.height = height;
1397         wnd->buffer.stride = width * 4;
1398         wnd->buffer_attached = false;
1399
1400         wlt_window_do_redraw(wnd, oldw, oldh);
1401
1402         if (old_buffer)
1403                 wl_buffer_destroy(old_buffer);
1404         if (old_pool)
1405                 wlt_pool_free(old_pool);
1406
1407         return 0;
1408 }
1409
1410 static void frame_callback(void *data, struct wl_callback *w_callback,
1411                            uint32_t time);
1412 static void idle_frame(struct ev_eloop *eloop, void *unused, void *data);
1413
1414 static const struct wl_callback_listener frame_callback_listener = {
1415         .done = frame_callback,
1416 };
1417
1418 static void do_frame(struct wlt_window *wnd)
1419 {
1420         ev_eloop_unregister_idle_cb(wnd->disp->eloop, idle_frame, wnd,
1421                                     EV_NORMAL);
1422
1423         if (wnd->need_resize) {
1424                 wnd->need_frame = true;
1425                 wnd->need_resize = false;
1426                 wnd->w_frame = wl_surface_frame(wnd->w_surface);
1427                 wl_callback_add_listener(wnd->w_frame,
1428                                          &frame_callback_listener, wnd);
1429                 resize_window(wnd, wnd->new_width, wnd->new_height);
1430         } else {
1431                 wnd->need_frame = true;
1432                 wnd->w_frame = wl_surface_frame(wnd->w_surface);
1433                 wl_callback_add_listener(wnd->w_frame,
1434                                          &frame_callback_listener, wnd);
1435                 wlt_window_do_redraw(wnd, wnd->buffer.width,
1436                                      wnd->buffer.height);
1437         }
1438 }
1439
1440 static void schedule_frame(struct wlt_window *wnd);
1441
1442 static void frame_callback(void *data, struct wl_callback *w_callback,
1443                            uint32_t time)
1444 {
1445         struct wlt_window *wnd = data;
1446
1447         wl_callback_destroy(w_callback);
1448         wnd->w_frame = NULL;
1449
1450         wnd->idle_pending = false;
1451         if (wnd->need_frame)
1452                 schedule_frame(wnd);
1453 }
1454
1455 static void idle_frame(struct ev_eloop *eloop, void *unused, void *data)
1456 {
1457         struct wlt_window *wnd = data;
1458
1459         do_frame(wnd);
1460 }
1461
1462 /*
1463  * Buffer Handling and Frame Scheduling
1464  * We use wl_shm for buffer allocation. This means, we have a single buffer
1465  * client side and the server loads it into its backbuffer for rendering. If the
1466  * server does not do this, we are screwed anyway, but that's on behalf of the
1467  * server, so we don't care.
1468  *
1469  * However, this means, when we create a buffer, we need to notify the
1470  * compositor and then wait until the compositor has created its back-buffer,
1471  * before we continue using this buffer. We can use the "frame" callback to get
1472  * notified about this.
1473  *
1474  * The logic we have is:
1475  * You set the boolean flags what action is needed in wlt_window and then call
1476  * "schedule_frame()". If we didn't already do any buffer operations in this
1477  * frame, then this function schedules an idle-callback which then performs
1478  * the requested functions (flags in wlt_window). Afterwards, it sets a marker
1479  * that this frame was already used and schedules a frame-callback.
1480  * If during this time another call to schedule_frame() is made, we do nothing
1481  * but wait for the frame-callback. It will then directly perform all the
1482  * requested functions and reschedule a frame-callback.
1483  * If nothing was schedule for one frame, we have no more interest in
1484  * frame-callbacks and thus we set "need_frame" to false again and don't
1485  * schedule any more frame-callbacks.
1486  */
1487 static void schedule_frame(struct wlt_window *wnd)
1488 {
1489         int ret;
1490
1491         if (!wnd)
1492                 return;
1493
1494         wnd->need_frame = true;
1495
1496         if (wnd->idle_pending)
1497                 return;
1498
1499         ret = ev_eloop_register_idle_cb(wnd->disp->eloop, idle_frame, wnd,
1500                                         EV_NORMAL);
1501         if (ret)
1502                 log_error("cannot schedule idle callback: %d", ret);
1503         else
1504                 wnd->idle_pending = true;
1505 }
1506
1507 static void shell_surface_configure(void *data, struct wl_shell_surface *s,
1508                                     uint32_t edges, int32_t width,
1509                                     int32_t height)
1510 {
1511         struct wlt_window *wnd = data;
1512
1513         if (width <= 0)
1514                 width = 1;
1515         if (height <= 0)
1516                 height = 1;
1517
1518         wnd->resize_edges = edges;
1519         wlt_window_set_size(wnd, width, height);
1520 }
1521
1522 static void shell_surface_popup_done(void *data, struct wl_shell_surface *s)
1523 {
1524 }
1525
1526 static const struct wl_shell_surface_listener shell_surface_listener = {
1527         .ping = shell_surface_ping,
1528         .configure = shell_surface_configure,
1529         .popup_done = shell_surface_popup_done,
1530 };
1531
1532 static void close_window(struct ev_eloop *eloop, void *unused, void *data)
1533 {
1534         struct wlt_window *wnd = data;
1535
1536         ev_eloop_unregister_idle_cb(eloop, close_window, wnd, EV_NORMAL);
1537         wnd->close_pending = false;
1538
1539         if (wnd->close_cb)
1540                 wnd->close_cb(wnd, wnd->data);
1541 }
1542
1543 int wlt_display_create_window(struct wlt_display *disp,
1544                               struct wlt_window **out,
1545                               unsigned int width,
1546                               unsigned int height,
1547                               void *data)
1548 {
1549         struct wlt_window *wnd;
1550         int ret;
1551
1552         if (!disp || !out || !width || !height)
1553                 return -EINVAL;
1554
1555         if (disp->state != STATE_RUNNING) {
1556                 log_error("cannot create window, display is not running but in state %u",
1557                           disp->state);
1558                 return -EBUSY;
1559         }
1560
1561         wnd = malloc(sizeof(*wnd));
1562         if (!wnd)
1563                 return -ENOMEM;
1564         memset(wnd, 0, sizeof(*wnd));
1565         wnd->ref = 1;
1566         wnd->disp = disp;
1567         wnd->data = data;
1568         shl_dlist_init(&wnd->widget_list);
1569
1570         wnd->w_surface = wl_compositor_create_surface(disp->w_comp);
1571         if (!wnd->w_surface) {
1572                 log_error("cannot create wayland surface");
1573                 ret = -EFAULT;
1574                 goto err_free;
1575         }
1576
1577         wnd->w_shell_surface = wl_shell_get_shell_surface(disp->w_shell,
1578                                                           wnd->w_surface);
1579         if (!wnd->w_shell_surface) {
1580                 log_error("cannot retrieve shell-surface for wayland surface");
1581                 ret = -EFAULT;
1582                 goto err_surface;
1583         }
1584
1585         wl_shell_surface_add_listener(wnd->w_shell_surface,
1586                                       &shell_surface_listener, wnd);
1587         wl_shell_surface_set_toplevel(wnd->w_shell_surface);
1588
1589         ret = resize_window(wnd, width, height);
1590         if (ret)
1591                 goto err_shell_surface;
1592
1593         wlt_display_ref(disp);
1594         shl_dlist_link(&disp->window_list, &wnd->list);
1595         *out = wnd;
1596         return 0;
1597
1598 err_shell_surface:
1599         wl_shell_surface_destroy(wnd->w_shell_surface);
1600 err_surface:
1601         wl_surface_destroy(wnd->w_surface);
1602 err_free:
1603         free(wnd);
1604         return ret;
1605 }
1606
1607 void wlt_window_ref(struct wlt_window *wnd)
1608 {
1609         if (!wnd || !wnd->ref)
1610                 return;
1611
1612         ++wnd->ref;
1613 }
1614
1615 void wlt_window_unref(struct wlt_window *wnd)
1616 {
1617         struct wlt_widget *widget;
1618
1619         if (!wnd || !wnd->ref || --wnd->ref)
1620                 return;
1621
1622         while (!shl_dlist_empty(&wnd->widget_list)) {
1623                 widget = shl_dlist_entry(wnd->widget_list.next,
1624                                          struct wlt_widget, list);
1625                 wlt_widget_destroy(widget);
1626         }
1627
1628         if (wnd->close_pending)
1629                 ev_eloop_unregister_idle_cb(wnd->disp->eloop, close_window,
1630                                             wnd, EV_NORMAL);
1631         if (wnd->idle_pending)
1632                 ev_eloop_unregister_idle_cb(wnd->disp->eloop, idle_frame, wnd,
1633                                             EV_NORMAL);
1634         shl_dlist_unlink(&wnd->list);
1635         if (wnd->w_frame)
1636                 wl_callback_destroy(wnd->w_frame);
1637         if (wnd->w_buffer)
1638                 wl_buffer_destroy(wnd->w_buffer);
1639         if (wnd->pool)
1640                 wlt_pool_free(wnd->pool);
1641         wl_shell_surface_destroy(wnd->w_shell_surface);
1642         wl_surface_destroy(wnd->w_surface);
1643         wlt_display_unref(wnd->disp);
1644         free(wnd);
1645 }
1646
1647 int wlt_window_create_widget(struct wlt_window *wnd,
1648                              struct wlt_widget **out,
1649                              void *data)
1650 {
1651         struct wlt_widget *widget;
1652
1653         if (!wnd || !out)
1654                 return -EINVAL;
1655
1656         widget = malloc(sizeof(*widget));
1657         if (!widget)
1658                 return -ENOMEM;
1659         memset(widget, 0, sizeof(*widget));
1660         widget->wnd = wnd;
1661         widget->data = data;
1662
1663         wlt_window_set_size(wnd, wnd->buffer.width, wnd->buffer.height);
1664         shl_dlist_link_tail(&wnd->widget_list, &widget->list);
1665         *out = widget;
1666         return 0;
1667 }
1668
1669 void wlt_window_schedule_redraw(struct wlt_window *wnd)
1670 {
1671         if (!wnd)
1672                 return;
1673
1674         schedule_frame(wnd);
1675 }
1676
1677 void wlt_window_damage(struct wlt_window *wnd,
1678                        struct wlt_rect *damage)
1679 {
1680         if (!wnd || !damage || wnd->skip_damage)
1681                 return;
1682
1683         wl_surface_damage(wnd->w_surface, damage->x, damage->y,
1684                           damage->width, damage->height);
1685         wl_surface_commit(wnd->w_surface);
1686 }
1687
1688 void wlt_window_get_buffer(struct wlt_window *wnd,
1689                            const struct wlt_rect *alloc,
1690                            struct wlt_shm_buffer *buf)
1691 {
1692         struct wlt_shm_buffer *rbuf;
1693
1694         if (!wnd || !buf)
1695                 return;
1696
1697         rbuf = &wnd->buffer;
1698
1699         if (!alloc) {
1700                 memcpy(buf, rbuf, sizeof(*buf));
1701                 return;
1702         }
1703
1704         if (alloc->x >= rbuf->width ||
1705             alloc->y >= rbuf->height) {
1706                 memset(buf, 0, sizeof(*buf));
1707                 return;
1708         }
1709
1710         /* set width */
1711         if (alloc->x + alloc->width > rbuf->width)
1712                 buf->width = rbuf->width - alloc->x;
1713         else
1714                 buf->width = alloc->width;
1715
1716         /* set height */
1717         if (alloc->y + alloc->height > rbuf->height)
1718                 buf->height = rbuf->height - alloc->y;
1719         else
1720                 buf->height = alloc->height;
1721
1722         /* set stride */
1723         buf->stride  = rbuf->stride;
1724
1725         /* set data */
1726         buf->data  = rbuf->data;
1727         buf->data += alloc->y * rbuf->stride;
1728         buf->data += alloc->x * 4;
1729 }
1730
1731 void wlt_window_move(struct wlt_window *wnd)
1732 {
1733         if (!wnd)
1734                 return;
1735
1736         wl_shell_surface_move(wnd->w_shell_surface,
1737                               wnd->disp->w_seat,
1738                               wnd->disp->last_serial);
1739 }
1740
1741 void wlt_window_resize(struct wlt_window *wnd, uint32_t edges)
1742 {
1743         if (!wnd)
1744                 return;
1745
1746         wl_shell_surface_resize(wnd->w_shell_surface,
1747                                 wnd->disp->w_seat,
1748                                 wnd->disp->last_serial,
1749                                 edges);
1750 }
1751
1752 int wlt_window_set_size(struct wlt_window *wnd,
1753                         unsigned int width, unsigned int height)
1754 {
1755         if (!wnd)
1756                 return -EINVAL;
1757
1758         wnd->new_width = width;
1759         wnd->new_height = height;
1760         wnd->need_resize = true;
1761         schedule_frame(wnd);
1762
1763         return 0;
1764 }
1765
1766 void wlt_window_set_cursor(struct wlt_window *wnd, unsigned int cursor)
1767 {
1768         if (!wnd)
1769                 return;
1770
1771         set_cursor(wnd->disp, cursor);
1772 }
1773
1774 void wlt_window_set_close_cb(struct wlt_window *wnd,
1775                              wlt_window_close_cb cb)
1776 {
1777         if (!wnd)
1778                 return;
1779
1780         wnd->close_cb = cb;
1781 }
1782
1783 void wlt_window_close(struct wlt_window *wnd)
1784 {
1785         if (!wnd)
1786                 return;
1787
1788         wnd->close_pending = true;
1789         ev_eloop_register_idle_cb(wnd->disp->eloop, close_window, wnd,
1790                                   EV_NORMAL);
1791 }
1792
1793 void wlt_window_toggle_maximize(struct wlt_window *wnd)
1794 {
1795         if (!wnd)
1796                 return;
1797
1798         if (wnd->maximized) {
1799                 if (!wnd->fullscreen) {
1800                         wl_shell_surface_set_toplevel(wnd->w_shell_surface);
1801                         wlt_window_set_size(wnd, wnd->saved_width,
1802                                             wnd->saved_height);
1803                 }
1804         } else {
1805                 if (!wnd->fullscreen) {
1806                         wnd->saved_width = wnd->buffer.width;
1807                         wnd->saved_height = wnd->buffer.height;
1808                         wl_shell_surface_set_maximized(wnd->w_shell_surface,
1809                                                        NULL);
1810                 }
1811         }
1812
1813         wnd->maximized = !wnd->maximized;
1814 }
1815
1816 void wlt_window_toggle_fullscreen(struct wlt_window *wnd)
1817 {
1818         if (!wnd)
1819                 return;
1820
1821         if (wnd->fullscreen) {
1822                 if (wnd->maximized) {
1823                         wl_shell_surface_set_maximized(wnd->w_shell_surface,
1824                                                        NULL);
1825                 } else {
1826                         wl_shell_surface_set_toplevel(wnd->w_shell_surface);
1827                         wlt_window_set_size(wnd, wnd->saved_width,
1828                                             wnd->saved_height);
1829                 }
1830         } else {
1831                 if (!wnd->maximized) {
1832                         wnd->saved_width = wnd->buffer.width;
1833                         wnd->saved_height = wnd->buffer.height;
1834                 }
1835                 wl_shell_surface_set_fullscreen(wnd->w_shell_surface,
1836                                 WL_SHELL_SURFACE_FULLSCREEN_METHOD_DEFAULT,
1837                                 0, NULL);
1838         }
1839
1840         wnd->fullscreen = !wnd->fullscreen;
1841 }
1842
1843 struct ev_eloop *wlt_window_get_eloop(struct wlt_window *wnd)
1844 {
1845         if (!wnd)
1846                 return NULL;
1847
1848         return wnd->disp->eloop;
1849 }
1850
1851 struct wlt_display *wlt_window_get_display(struct wlt_window *wnd)
1852 {
1853         if (!wnd)
1854                 return NULL;
1855
1856         return wnd->disp;
1857 }
1858
1859 void wlt_widget_destroy(struct wlt_widget *widget)
1860 {
1861         if (!widget)
1862                 return;
1863
1864         if (widget->destroy_cb)
1865                 widget->destroy_cb(widget, widget->data);
1866         shl_dlist_unlink(&widget->list);
1867         free(widget);
1868 }
1869
1870 struct wlt_window *wlt_widget_get_window(struct wlt_widget *widget)
1871 {
1872         if (!widget)
1873                 return NULL;
1874
1875         return widget->wnd;
1876 }
1877
1878 void wlt_widget_set_redraw_cb(struct wlt_widget *widget,
1879                               wlt_widget_redraw_cb cb)
1880 {
1881         if (!widget)
1882                 return;
1883
1884         widget->redraw_cb = cb;
1885 }
1886
1887 void wlt_widget_set_destroy_cb(struct wlt_widget *widget,
1888                                wlt_widget_destroy_cb cb)
1889 {
1890         if (!widget)
1891                 return;
1892
1893         widget->destroy_cb = cb;
1894 }
1895
1896 void wlt_widget_set_resize_cb(struct wlt_widget *widget,
1897                               wlt_widget_prepare_resize_cb prepare_cb,
1898                               wlt_widget_resize_cb cb)
1899 {
1900         if (!widget)
1901                 return;
1902
1903         widget->prepare_resize_cb = prepare_cb;
1904         widget->resize_cb = cb;
1905 }
1906
1907 void wlt_widget_set_pointer_cb(struct wlt_widget *widget,
1908                                wlt_widget_pointer_enter_cb enter_cb,
1909                                wlt_widget_pointer_leave_cb leave_cb,
1910                                wlt_widget_pointer_motion_cb motion_cb,
1911                                wlt_widget_pointer_button_cb button_cb)
1912 {
1913         if (!widget)
1914                 return;
1915
1916         widget->pointer_enter_cb = enter_cb;
1917         widget->pointer_leave_cb = leave_cb;
1918         widget->pointer_motion_cb = motion_cb;
1919         widget->pointer_button_cb = button_cb;
1920 }
1921
1922 void wlt_widget_set_keyboard_cb(struct wlt_widget *widget,
1923                                 wlt_widget_keyboard_cb cb)
1924 {
1925         if (!widget)
1926                 return;
1927
1928         widget->keyboard_cb = cb;
1929 }