src/screen-share.c

   1 /*
   2  * Copyright © 2008-2011 Kristian Høgsberg
   3  * Copyright © 2014 Jason Ekstrand
   4  *
   5  * Permission to use, copy, modify, distribute, and sell this software and
   6  * its documentation for any purpose is hereby granted without fee, provided
   7  * that the above copyright notice appear in all copies and that both that
   8  * copyright notice and this permission notice appear in supporting
   9  * documentation, and that the name of the copyright holders not be used in
  10  * advertising or publicity pertaining to distribution of the software
  11  * without specific, written prior permission.  The copyright holders make
  12  * no representations about the suitability of this software for any
  13  * purpose.  It is provided "as is" without express or implied warranty.
  14  *
  15  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
  16  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
  17  * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
  18  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
  19  * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
  20  * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  21  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  22  */
  23
  24 #include "config.h"
  25
  26 #include <stdlib.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30 #include <sys/socket.h>
  31 #include <sys/mman.h>
  32 #include <signal.h>
  33 #include <linux/input.h>
  34 #include <errno.h>
  35 #include <ctype.h>
  36
  37 #include <wayland-client.h>
  38
  39 #include "compositor.h"
  40 #include "../shared/os-compatibility.h"
  41 #include "fullscreen-shell-client-protocol.h"
  42
  43 struct shared_output {
  44         struct weston_output *output;
  45         struct wl_listener output_destroyed;
  46         struct wl_list seat_list;
  47
  48         struct {
  49                 struct wl_display *display;
  50                 struct wl_registry *registry;
  51                 struct wl_compositor *compositor;
  52                 struct wl_shm *shm;
  53                 uint32_t shm_formats;
  54                 struct _wl_fullscreen_shell *fshell;
  55                 struct wl_output *output;
  56                 struct wl_surface *surface;
  57                 struct wl_callback *frame_cb;
  58                 struct _wl_fullscreen_shell_mode_feedback *mode_feedback;
  59         } parent;
  60
  61         struct wl_event_source *event_source;
  62         struct wl_listener frame_listener;
  63
  64         struct {
  65                 int32_t width, height;
  66
  67                 struct wl_list buffers;
  68                 struct wl_list free_buffers;
  69         } shm;
  70
  71         int cache_dirty;
  72         pixman_image_t *cache_image;
  73         uint32_t *tmp_data;
  74         size_t tmp_data_size;
  75 };
  76
  77 struct ss_seat {
  78         struct weston_seat base;
  79         struct shared_output *output;
  80         struct wl_list link;
  81
  82         struct {
  83                 struct wl_seat *seat;
  84                 struct wl_pointer *pointer;
  85                 struct wl_keyboard *keyboard;
  86         } parent;
  87
  88         enum weston_key_state_update keyboard_state_update;
  89         uint32_t key_serial;
  90 };
  91
  92 struct ss_shm_buffer {
  93         struct shared_output *output;
  94         struct wl_list link;
  95         struct wl_list free_link;
  96
  97         struct wl_buffer *buffer;
  98         void *data;
  99         size_t size;
 100         pixman_region32_t damage;
 101
 102         pixman_image_t *pm_image;
 103 };
 104
 105 struct screen_share {
 106         struct weston_compositor *compositor;
 107         char *command;
 108 };
 109
 110 static void
 111 ss_seat_handle_pointer_enter(void *data, struct wl_pointer *pointer,
 112                              uint32_t serial, struct wl_surface *surface,
 113                              wl_fixed_t x, wl_fixed_t y)
 114 {
 115         struct ss_seat *seat = data;
 116
 117         /* No transformation of input position is required here because we are
 118          * always receiving the input in the same coordinates as the output. */
 119
 120         notify_pointer_focus(&seat->base, NULL, 0, 0);
 121 }
 122
 123 static void
 124 ss_seat_handle_pointer_leave(void *data, struct wl_pointer *pointer,
 125                              uint32_t serial, struct wl_surface *surface)
 126 {
 127         struct ss_seat *seat = data;
 128
 129         notify_pointer_focus(&seat->base, NULL, 0, 0);
 130 }
 131
 132 static void
 133 ss_seat_handle_motion(void *data, struct wl_pointer *pointer,
 134                       uint32_t time, wl_fixed_t x, wl_fixed_t y)
 135 {
 136         struct ss_seat *seat = data;
 137
 138         /* No transformation of input position is required here because we are
 139          * always receiving the input in the same coordinates as the output. */
 140
 141         notify_motion_absolute(&seat->base, time, x, y);
 142 }
 143
 144 static void
 145 ss_seat_handle_button(void *data, struct wl_pointer *pointer,
 146                       uint32_t serial, uint32_t time, uint32_t button,
 147                       uint32_t state)
 148 {
 149         struct ss_seat *seat = data;
 150
 151         notify_button(&seat->base, time, button, state);
 152 }
 153
 154 static void
 155 ss_seat_handle_axis(void *data, struct wl_pointer *pointer,
 156                     uint32_t time, uint32_t axis, wl_fixed_t value)
 157 {
 158         struct ss_seat *seat = data;
 159
 160         notify_axis(&seat->base, time, axis, value);
 161 }
 162
 163 static const struct wl_pointer_listener ss_seat_pointer_listener = {
 164         ss_seat_handle_pointer_enter,
 165         ss_seat_handle_pointer_leave,
 166         ss_seat_handle_motion,
 167         ss_seat_handle_button,
 168         ss_seat_handle_axis,
 169 };
 170
 171 static void
 172 ss_seat_handle_keymap(void *data, struct wl_keyboard *keyboard,
 173                       uint32_t format, int fd, uint32_t size)
 174 {
 175         struct ss_seat *seat = data;
 176         struct xkb_keymap *keymap;
 177         char *map_str;
 178
 179         if (!data)
 180                 goto error;
 181
 182         if (format == WL_KEYBOARD_KEYMAP_FORMAT_XKB_V1) {
 183                 map_str = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
 184                 if (map_str == MAP_FAILED) {
 185                         weston_log("mmap failed: %m\n");
 186                         goto error;
 187                 }
 188
 189                 keymap = xkb_keymap_new_from_string(seat->base.compositor->xkb_context,
 190                                                     map_str,
 191                                                     XKB_KEYMAP_FORMAT_TEXT_V1,
 192                                                     0);
 193                 munmap(map_str, size);
 194
 195                 if (!keymap) {
 196                         weston_log("failed to compile keymap\n");
 197                         goto error;
 198                 }
 199
 200                 seat->keyboard_state_update = STATE_UPDATE_NONE;
 201         } else if (format == WL_KEYBOARD_KEYMAP_FORMAT_NO_KEYMAP) {
 202                 weston_log("No keymap provided; falling back to default\n");
 203                 keymap = NULL;
 204                 seat->keyboard_state_update = STATE_UPDATE_AUTOMATIC;
 205         } else {
 206                 weston_log("Invalid keymap\n");
 207                 goto error;
 208         }
 209
 210         close(fd);
 211
 212         if (seat->base.keyboard)
 213                 weston_seat_update_keymap(&seat->base, keymap);
 214         else
 215                 weston_seat_init_keyboard(&seat->base, keymap);
 216
 217         xkb_keymap_unref(keymap);
 218
 219         return;
 220
 221 error:
 222         wl_keyboard_release(seat->parent.keyboard);
 223         close(fd);
 224 }
 225
 226 static void
 227 ss_seat_handle_keyboard_enter(void *data, struct wl_keyboard *keyboard,
 228                               uint32_t serial, struct wl_surface *surface,
 229                               struct wl_array *keys)
 230 {
 231         struct ss_seat *seat = data;
 232
 233         /* XXX: If we get a modifier event immediately before the focus,
 234          *      we should try to keep the same serial. */
 235         notify_keyboard_focus_in(&seat->base, keys,
 236                                  STATE_UPDATE_AUTOMATIC);
 237 }
 238
 239 static void
 240 ss_seat_handle_keyboard_leave(void *data, struct wl_keyboard *keyboard,
 241                               uint32_t serial, struct wl_surface *surface)
 242 {
 243         struct ss_seat *seat = data;
 244
 245         notify_keyboard_focus_out(&seat->base);
 246 }
 247
 248 static void
 249 ss_seat_handle_key(void *data, struct wl_keyboard *keyboard,
 250                    uint32_t serial, uint32_t time,
 251                    uint32_t key, uint32_t state)
 252 {
 253         struct ss_seat *seat = data;
 254
 255         seat->key_serial = serial;
 256         notify_key(&seat->base, time, key,
 257                    state ? WL_KEYBOARD_KEY_STATE_PRESSED :
 258                            WL_KEYBOARD_KEY_STATE_RELEASED,
 259                    seat->keyboard_state_update);
 260 }
 261
 262 static void
 263 ss_seat_handle_modifiers(void *data, struct wl_keyboard *keyboard,
 264                          uint32_t serial_in, uint32_t mods_depressed,
 265                          uint32_t mods_latched, uint32_t mods_locked,
 266                          uint32_t group)
 267 {
 268         struct ss_seat *seat = data;
 269         struct weston_compositor *c = seat->output->output->compositor;
 270         uint32_t serial_out;
 271
 272         /* If we get a key event followed by a modifier event with the
 273          * same serial number, then we try to preserve those semantics by
 274          * reusing the same serial number on the way out too. */
 275         if (serial_in == seat->key_serial)
 276                 serial_out = wl_display_get_serial(c->wl_display);
 277         else
 278                 serial_out = wl_display_next_serial(c->wl_display);
 279
 280         xkb_state_update_mask(seat->base.keyboard->xkb_state.state,
 281                               mods_depressed, mods_latched,
 282                               mods_locked, 0, 0, group);
 283         notify_modifiers(&seat->base, serial_out);
 284 }
 285
 286 static const struct wl_keyboard_listener ss_seat_keyboard_listener = {
 287         ss_seat_handle_keymap,
 288         ss_seat_handle_keyboard_enter,
 289         ss_seat_handle_keyboard_leave,
 290         ss_seat_handle_key,
 291         ss_seat_handle_modifiers,
 292 };
 293
 294 static void
 295 ss_seat_handle_capabilities(void *data, struct wl_seat *seat,
 296                             enum wl_seat_capability caps)
 297 {
 298         struct ss_seat *ss_seat = data;
 299
 300         if ((caps & WL_SEAT_CAPABILITY_POINTER) && !ss_seat->parent.pointer) {
 301                 ss_seat->parent.pointer = wl_seat_get_pointer(seat);
 302                 wl_pointer_set_user_data(ss_seat->parent.pointer, ss_seat);
 303                 wl_pointer_add_listener(ss_seat->parent.pointer,
 304                                         &ss_seat_pointer_listener, ss_seat);
 305                 weston_seat_init_pointer(&ss_seat->base);
 306         } else if (!(caps & WL_SEAT_CAPABILITY_POINTER) && ss_seat->parent.pointer) {
 307                 wl_pointer_destroy(ss_seat->parent.pointer);
 308                 ss_seat->parent.pointer = NULL;
 309         }
 310
 311         if ((caps & WL_SEAT_CAPABILITY_KEYBOARD) && !ss_seat->parent.keyboard) {
 312                 ss_seat->parent.keyboard = wl_seat_get_keyboard(seat);
 313                 wl_keyboard_set_user_data(ss_seat->parent.keyboard, ss_seat);
 314                 wl_keyboard_add_listener(ss_seat->parent.keyboard,
 315                                          &ss_seat_keyboard_listener, ss_seat);
 316         } else if (!(caps & WL_SEAT_CAPABILITY_KEYBOARD) && ss_seat->parent.keyboard) {
 317                 wl_keyboard_destroy(ss_seat->parent.keyboard);
 318                 ss_seat->parent.keyboard = NULL;
 319         }
 320 }
 321
 322 static const struct wl_seat_listener ss_seat_listener = {
 323         ss_seat_handle_capabilities,
 324 };
 325
 326 static struct ss_seat *
 327 ss_seat_create(struct shared_output *so, uint32_t id)
 328 {
 329         struct ss_seat *seat;
 330
 331         seat = zalloc(sizeof *seat);
 332         if (seat == NULL)
 333                 return NULL;
 334
 335         weston_seat_init(&seat->base, so->output->compositor, "default");
 336         seat->output = so;
 337         seat->parent.seat = wl_registry_bind(so->parent.registry, id,
 338                                              &wl_seat_interface, 1);
 339         wl_list_insert(so->seat_list.prev, &seat->link);
 340
 341         wl_seat_add_listener(seat->parent.seat, &ss_seat_listener, seat);
 342         wl_seat_set_user_data(seat->parent.seat, seat);
 343
 344         return seat;
 345 }
 346
 347 static void
 348 ss_seat_destroy(struct ss_seat *seat)
 349 {
 350         if (seat->parent.pointer)
 351                 wl_pointer_release(seat->parent.pointer);
 352         if (seat->parent.keyboard)
 353                 wl_keyboard_release(seat->parent.keyboard);
 354         wl_seat_destroy(seat->parent.seat);
 355
 356         wl_list_remove(&seat->link);
 357
 358         weston_seat_release(&seat->base);
 359
 360         free(seat);
 361 }
 362
 363 static void
 364 ss_shm_buffer_destroy(struct ss_shm_buffer *buffer)
 365 {
 366         pixman_image_unref(buffer->pm_image);
 367
 368         wl_buffer_destroy(buffer->buffer);
 369         munmap(buffer->data, buffer->size);
 370
 371         pixman_region32_fini(&buffer->damage);
 372
 373         wl_list_remove(&buffer->link);
 374         wl_list_remove(&buffer->free_link);
 375         free(buffer);
 376 }
 377
 378 static void
 379 buffer_release(void *data, struct wl_buffer *buffer)
 380 {
 381         struct ss_shm_buffer *sb = data;
 382
 383         if (sb->output) {
 384                 wl_list_insert(&sb->output->shm.free_buffers, &sb->free_link);
 385         } else {
 386                 ss_shm_buffer_destroy(sb);
 387         }
 388 }
 389
 390 static const struct wl_buffer_listener buffer_listener = {
 391         buffer_release
 392 };
 393
 394 static struct ss_shm_buffer *
 395 shared_output_get_shm_buffer(struct shared_output *so)
 396 {
 397         struct ss_shm_buffer *sb, *bnext;
 398         struct wl_shm_pool *pool;
 399         int width, height, stride;
 400         int fd;
 401         unsigned char *data;
 402
 403         width = so->output->width;
 404         height = so->output->height;
 405         stride = width * 4;
 406
 407         /* If the size of the output changed, we free the old buffers and
 408          * make new ones. */
 409         if (so->shm.width != width ||
 410             so->shm.height != height) {
 411
 412                 /* Destroy free buffers */
 413                 wl_list_for_each_safe(sb, bnext, &so->shm.free_buffers, link)
 414                         ss_shm_buffer_destroy(sb);
 415
 416                 /* Orphan in-use buffers so they get destroyed */
 417                 wl_list_for_each(sb, &so->shm.buffers, link)
 418                         sb->output = NULL;
 419
 420                 so->shm.width = width;
 421                 so->shm.height = height;
 422         }
 423
 424         if (!wl_list_empty(&so->shm.free_buffers)) {
 425                 sb = container_of(so->shm.free_buffers.next,
 426                                   struct ss_shm_buffer, free_link);
 427                 wl_list_remove(&sb->free_link);
 428                 wl_list_init(&sb->free_link);
 429
 430                 return sb;
 431         }
 432
 433         fd = os_create_anonymous_file(height * stride);
 434         if (fd < 0) {
 435                 weston_log("os_create_anonymous_file: %m");
 436                 return NULL;
 437         }
 438
 439         data = mmap(NULL, height * stride, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
 440         if (data == MAP_FAILED) {
 441                 weston_log("mmap: %m");
 442                 goto out_close;
 443         }
 444
 445         sb = zalloc(sizeof *sb);
 446         if (!sb)
 447                 goto out_unmap;
 448
 449         sb->output = so;
 450         wl_list_init(&sb->free_link);
 451         wl_list_insert(&so->shm.buffers, &sb->link);
 452
 453         pixman_region32_init_rect(&sb->damage, 0, 0, width, height);
 454
 455         sb->data = data;
 456         sb->size = height * stride;
 457
 458         pool = wl_shm_create_pool(so->parent.shm, fd, sb->size);
 459
 460         sb->buffer = wl_shm_pool_create_buffer(pool, 0,
 461                                                width, height, stride,
 462                                                WL_SHM_FORMAT_ARGB8888);
 463         wl_buffer_add_listener(sb->buffer, &buffer_listener, sb);
 464         wl_shm_pool_destroy(pool);
 465         close(fd);
 466         fd = -1;
 467
 468         memset(data, 0, sb->size);
 469
 470         sb->pm_image =
 471                 pixman_image_create_bits(PIXMAN_a8r8g8b8, width, height,
 472                                          (uint32_t *)data, stride);
 473         if (!sb->pm_image)
 474                 goto out_pixman_error;
 475
 476         return sb;
 477
 478 out_pixman_error:
 479         pixman_region32_fini(&sb->damage);
 480 out_unmap:
 481         munmap(data, height * stride);
 482 out_close:
 483         if (fd != -1)
 484                 close(fd);
 485         return NULL;
 486 }
 487
 488 static void
 489 output_compute_transform(struct weston_output *output,
 490                          pixman_transform_t *transform)
 491 {
 492         pixman_fixed_t fw, fh;
 493
 494         pixman_transform_init_identity(transform);
 495
 496         fw = pixman_int_to_fixed(output->width);
 497         fh = pixman_int_to_fixed(output->height);
 498
 499         switch (output->transform) {
 500         case WL_OUTPUT_TRANSFORM_FLIPPED:
 501         case WL_OUTPUT_TRANSFORM_FLIPPED_90:
 502         case WL_OUTPUT_TRANSFORM_FLIPPED_180:
 503         case WL_OUTPUT_TRANSFORM_FLIPPED_270:
 504                 pixman_transform_scale(transform, NULL,
 505                                        pixman_int_to_fixed (-1),
 506                                        pixman_int_to_fixed (1));
 507                 pixman_transform_translate(transform, NULL, fw, 0);
 508         }
 509
 510         switch (output->transform) {
 511         default:
 512         case WL_OUTPUT_TRANSFORM_NORMAL:
 513         case WL_OUTPUT_TRANSFORM_FLIPPED:
 514                 break;
 515         case WL_OUTPUT_TRANSFORM_90:
 516         case WL_OUTPUT_TRANSFORM_FLIPPED_90:
 517                 pixman_transform_rotate(transform, NULL, 0, pixman_fixed_1);
 518                 pixman_transform_translate(transform, NULL, fh, 0);
 519                 break;
 520         case WL_OUTPUT_TRANSFORM_180:
 521         case WL_OUTPUT_TRANSFORM_FLIPPED_180:
 522                 pixman_transform_rotate(transform, NULL, -pixman_fixed_1, 0);
 523                 pixman_transform_translate(transform, NULL, fw, fh);
 524                 break;
 525         case WL_OUTPUT_TRANSFORM_270:
 526         case WL_OUTPUT_TRANSFORM_FLIPPED_270:
 527                 pixman_transform_rotate(transform, NULL, 0, -pixman_fixed_1);
 528                 pixman_transform_translate(transform, NULL, 0, fw);
 529                 break;
 530         }
 531
 532         pixman_transform_scale(transform, NULL,
 533                                pixman_fixed_1 * output->current_scale,
 534                                pixman_fixed_1 * output->current_scale);
 535 }
 536
 537 static void
 538 shared_output_destroy(struct shared_output *so);
 539
 540 static int
 541 shared_output_ensure_tmp_data(struct shared_output *so,
 542                               pixman_region32_t *region)
 543 {
 544         pixman_box32_t *ext;
 545         size_t size;
 546
 547         if (!pixman_region32_not_empty(region))
 548                 return 0;
 549
 550         ext = pixman_region32_extents(region);
 551
 552         /* Damage is in output coordinates.
 553          *
 554          * We are multiplying by 4 because the temporary data needs to be able
 555          * to store an 32 bit-per-pixel buffer.
 556          */
 557         size = 4 * (ext->x2 - ext->x1) * (ext->y2 - ext->y1)
 558                  * so->output->current_scale * so->output->current_scale;
 559
 560         if (so->tmp_data != NULL && size <= so->tmp_data_size)
 561                 return 0;
 562
 563         free(so->tmp_data);
 564         so->tmp_data = malloc(size);
 565         if (so->tmp_data == NULL) {
 566                 so->tmp_data_size = 0;
 567                 errno = ENOMEM;
 568                 return -1;
 569         }
 570
 571         so->tmp_data_size = size;
 572
 573         return 0;
 574 }
 575
 576 static void
 577 shared_output_update(struct shared_output *so);
 578
 579 static void
 580 shared_output_frame_callback(void *data, struct wl_callback *cb, uint32_t time)
 581 {
 582         struct shared_output *so = data;
 583
 584         if (cb != so->parent.frame_cb)
 585                 return;
 586
 587         wl_callback_destroy(cb);
 588         so->parent.frame_cb = NULL;
 589
 590         shared_output_update(so);
 591 }
 592
 593 static const struct wl_callback_listener shared_output_frame_listener = {
 594         shared_output_frame_callback
 595 };
 596
 597 static void
 598 shared_output_update(struct shared_output *so)
 599 {
 600         struct ss_shm_buffer *sb;
 601         pixman_box32_t *r;
 602         int i, nrects;
 603         pixman_transform_t transform;
 604
 605         /* Only update if we need to */
 606         if (!so->cache_dirty || so->parent.frame_cb)
 607                 return;
 608
 609         sb = shared_output_get_shm_buffer(so);
 610         if (sb == NULL) {
 611                 shared_output_destroy(so);
 612                 return;
 613         }
 614
 615         output_compute_transform(so->output, &transform);
 616         pixman_image_set_transform(so->cache_image, &transform);
 617
 618         pixman_image_set_clip_region32(sb->pm_image, &sb->damage);
 619
 620         if (so->output->current_scale == 1) {
 621                 pixman_image_set_filter(so->cache_image,
 622                                         PIXMAN_FILTER_NEAREST, NULL, 0);
 623         } else {
 624                 pixman_image_set_filter(so->cache_image,
 625                                         PIXMAN_FILTER_BILINEAR, NULL, 0);
 626         }
 627
 628         pixman_image_composite32(PIXMAN_OP_SRC,
 629                                  so->cache_image, /* src */
 630                                  NULL, /* mask */
 631                                  sb->pm_image, /* dest */
 632                                  0, 0, /* src_x, src_y */
 633                                  0, 0, /* mask_x, mask_y */
 634                                  0, 0, /* dest_x, dest_y */
 635                                  so->output->width, /* width */
 636                                  so->output->height /* height */);
 637
 638         pixman_image_set_transform(sb->pm_image, NULL);
 639         pixman_image_set_clip_region32(sb->pm_image, NULL);
 640
 641         r = pixman_region32_rectangles(&sb->damage, &nrects);
 642         for (i = 0; i < nrects; ++i)
 643                 wl_surface_damage(so->parent.surface, r[i].x1, r[i].y1,
 644                                   r[i].x2 - r[i].x1, r[i].y2 - r[i].y1);
 645
 646         wl_surface_attach(so->parent.surface, sb->buffer, 0, 0);
 647
 648         so->parent.frame_cb = wl_surface_frame(so->parent.surface);
 649         wl_callback_add_listener(so->parent.frame_cb,
 650                                  &shared_output_frame_listener, so);
 651
 652         wl_surface_commit(so->parent.surface);
 653         wl_callback_destroy(wl_display_sync(so->parent.display));
 654         wl_display_flush(so->parent.display);
 655
 656         /* Clear the buffer damage */
 657         pixman_region32_fini(&sb->damage);
 658         pixman_region32_init(&sb->damage);
 659 }
 660
 661 static void
 662 shm_handle_format(void *data, struct wl_shm *wl_shm, uint32_t format)
 663 {
 664         struct shared_output *so = data;
 665
 666         so->parent.shm_formats |= (1 << format);
 667 }
 668
 669 struct wl_shm_listener shm_listener = {
 670         shm_handle_format
 671 };
 672
 673 static void
 674 registry_handle_global(void *data, struct wl_registry *registry,
 675                        uint32_t id, const char *interface, uint32_t version)
 676 {
 677         struct shared_output *so = data;
 678
 679         if (strcmp(interface, "wl_compositor") == 0) {
 680                 so->parent.compositor =
 681                         wl_registry_bind(registry,
 682                                          id, &wl_compositor_interface, 1);
 683         } else if (strcmp(interface, "wl_output") == 0 && !so->parent.output) {
 684                 so->parent.output =
 685                         wl_registry_bind(registry,
 686                                          id, &wl_output_interface, 1);
 687         } else if (strcmp(interface, "wl_seat") == 0) {
 688                 ss_seat_create(so, id);
 689         } else if (strcmp(interface, "wl_shm") == 0) {
 690                 so->parent.shm =
 691                         wl_registry_bind(registry,
 692                                          id, &wl_shm_interface, 1);
 693                 wl_shm_add_listener(so->parent.shm, &shm_listener, so);
 694         } else if (strcmp(interface, "_wl_fullscreen_shell") == 0) {
 695                 so->parent.fshell =
 696                         wl_registry_bind(registry,
 697                                          id, &_wl_fullscreen_shell_interface, 1);
 698         }
 699 }
 700
 701 static void
 702 registry_handle_global_remove(void *data, struct wl_registry *registry,
 703                               uint32_t name)
 704 {
 705 }
 706
 707 static const struct wl_registry_listener registry_listener = {
 708         registry_handle_global,
 709         registry_handle_global_remove
 710 };
 711
 712 static int
 713 shared_output_handle_event(int fd, uint32_t mask, void *data)
 714 {
 715         struct shared_output *so = data;
 716         int count = 0;
 717
 718         if ((mask & WL_EVENT_HANGUP) || (mask & WL_EVENT_ERROR)) {
 719                 shared_output_destroy(so);
 720                 return 0;
 721         }
 722
 723         if (mask & WL_EVENT_READABLE)
 724                 count = wl_display_dispatch(so->parent.display);
 725         if (mask & WL_EVENT_WRITABLE)
 726                 wl_display_flush(so->parent.display);
 727
 728         if (mask == 0) {
 729                 count = wl_display_dispatch_pending(so->parent.display);
 730                 wl_display_flush(so->parent.display);
 731         }
 732
 733         return count;
 734 }
 735
 736 static void
 737 output_destroyed(struct wl_listener *l, void *data)
 738 {
 739         struct shared_output *so;
 740
 741         so = container_of(l, struct shared_output, output_destroyed);
 742
 743         shared_output_destroy(so);
 744 }
 745
 746 static void
 747 mode_feedback_ok(void *data, struct _wl_fullscreen_shell_mode_feedback *fb)
 748 {
 749         struct shared_output *so = data;
 750
 751         _wl_fullscreen_shell_mode_feedback_destroy(so->parent.mode_feedback);
 752 }
 753
 754 static void
 755 mode_feedback_failed(void *data, struct _wl_fullscreen_shell_mode_feedback *fb)
 756 {
 757         struct shared_output *so = data;
 758
 759         _wl_fullscreen_shell_mode_feedback_destroy(so->parent.mode_feedback);
 760
 761         weston_log("Screen share failed: present_surface_for_mode failed\n");
 762         shared_output_destroy(so);
 763 }
 764
 765 struct _wl_fullscreen_shell_mode_feedback_listener mode_feedback_listener = {
 766         mode_feedback_ok,
 767         mode_feedback_failed,
 768         mode_feedback_ok,
 769 };
 770
 771 static void
 772 shared_output_repainted(struct wl_listener *listener, void *data)
 773 {
 774         struct shared_output *so =
 775                 container_of(listener, struct shared_output, frame_listener);
 776         pixman_region32_t damage;
 777         struct ss_shm_buffer *sb;
 778         int32_t x, y, width, height, stride;
 779         int i, nrects, do_yflip;
 780         pixman_box32_t *r;
 781         uint32_t *cache_data;
 782
 783         /* Damage in output coordinates */
 784         pixman_region32_init(&damage);
 785         pixman_region32_intersect(&damage, &so->output->region,
 786                                   &so->output->previous_damage);
 787         pixman_region32_translate(&damage, -so->output->x, -so->output->y);
 788
 789         /* Apply damage to all buffers */
 790         wl_list_for_each(sb, &so->shm.buffers, link)
 791                 pixman_region32_union(&sb->damage, &sb->damage, &damage);
 792
 793         /* Transform to buffer coordinates */
 794         weston_transformed_region(so->output->width, so->output->height,
 795                                   so->output->transform,
 796                                   so->output->current_scale,
 797                                   &damage, &damage);
 798
 799         width = so->output->current_mode->width;
 800         height = so->output->current_mode->height;
 801         stride = width;
 802
 803         if (!so->cache_image ||
 804             pixman_image_get_width(so->cache_image) != width ||
 805             pixman_image_get_height(so->cache_image) != height) {
 806                 if (so->cache_image)
 807                         pixman_image_unref(so->cache_image);
 808
 809                 so->cache_image =
 810                         pixman_image_create_bits(PIXMAN_a8r8g8b8,
 811                                                  width, height, NULL,
 812                                                  stride);
 813                 if (!so->cache_image) {
 814                         shared_output_destroy(so);
 815                         return;
 816                 }
 817
 818                 pixman_region32_fini(&damage);
 819                 pixman_region32_init_rect(&damage, 0, 0, width, height);
 820         }
 821
 822         if (shared_output_ensure_tmp_data(so, &damage) < 0) {
 823                 shared_output_destroy(so);
 824                 return;
 825         }
 826
 827         do_yflip = !!(so->output->compositor->capabilities & WESTON_CAP_CAPTURE_YFLIP);
 828
 829         cache_data = pixman_image_get_data(so->cache_image);
 830         r = pixman_region32_rectangles(&damage, &nrects);
 831         for (i = 0; i < nrects; ++i) {
 832                 x = r[i].x1;
 833                 y = r[i].y1;
 834                 width = r[i].x2 - r[i].x1;
 835                 height = r[i].y2 - r[i].y1;
 836
 837                 if (do_yflip) {
 838                         so->output->compositor->renderer->read_pixels(
 839                                 so->output, PIXMAN_a8r8g8b8, so->tmp_data,
 840                                 x, so->output->current_mode->height - r[i].y2,
 841                                 width, height);
 842
 843                         pixman_blt(so->tmp_data, cache_data, -width, stride,
 844                                    32, 32, 0, 1 - height, x, y, width, height);
 845                 } else {
 846                         so->output->compositor->renderer->read_pixels(
 847                                 so->output, PIXMAN_a8r8g8b8, so->tmp_data,
 848                                 x, y, width, height);
 849
 850                         pixman_blt(so->tmp_data, cache_data, width, stride,
 851                                    32, 32, 0, 0, x, y, width, height);
 852                 }
 853         }
 854
 855         pixman_region32_fini(&damage);
 856
 857         so->cache_dirty = 1;
 858
 859         shared_output_update(so);
 860 }
 861
 862 static struct shared_output *
 863 shared_output_create(struct weston_output *output, int parent_fd)
 864 {
 865         struct shared_output *so;
 866         struct wl_event_loop *loop;
 867         struct ss_seat *seat;
 868         int epoll_fd;
 869
 870         so = zalloc(sizeof *so);
 871         if (so == NULL)
 872                 goto err_close;
 873
 874         wl_list_init(&so->seat_list);
 875
 876         so->parent.display = wl_display_connect_to_fd(parent_fd);
 877         if (!so->parent.display)
 878                 goto err_alloc;
 879
 880         so->parent.registry = wl_display_get_registry(so->parent.display);
 881         if (!so->parent.registry)
 882                 goto err_display;
 883         wl_registry_add_listener(so->parent.registry,
 884                                  &registry_listener, so);
 885         wl_display_roundtrip(so->parent.display);
 886         if (so->parent.shm == NULL) {
 887                 weston_log("Screen share failed: No wl_shm found\n");
 888                 goto err_display;
 889         }
 890         if (so->parent.fshell == NULL) {
 891                 weston_log("Screen share failed: "
 892                            "Parent does not support wl_fullscreen_shell\n");
 893                 goto err_display;
 894         }
 895         if (so->parent.compositor == NULL) {
 896                 weston_log("Screen share failed: No wl_compositor found\n");
 897                 goto err_display;
 898         }
 899
 900         /* Get SHM formats */
 901         wl_display_roundtrip(so->parent.display);
 902         if (!(so->parent.shm_formats & (1 << WL_SHM_FORMAT_XRGB8888))) {
 903                 weston_log("Screen share failed: "
 904                            "WL_SHM_FORMAT_XRGB8888 not available\n");
 905                 goto err_display;
 906         }
 907
 908         so->parent.surface =
 909                 wl_compositor_create_surface(so->parent.compositor);
 910         if (!so->parent.surface) {
 911                 weston_log("Screen share failed: %m");
 912                 goto err_display;
 913         }
 914
 915         so->parent.mode_feedback =
 916                 _wl_fullscreen_shell_present_surface_for_mode(so->parent.fshell,
 917                                                               so->parent.surface,
 918                                                               so->parent.output,
 919                                                               output->current_mode->refresh);
 920         if (!so->parent.mode_feedback) {
 921                 weston_log("Screen share failed: %m");
 922                 goto err_display;
 923         }
 924         _wl_fullscreen_shell_mode_feedback_add_listener(so->parent.mode_feedback,
 925                                                         &mode_feedback_listener,
 926                                                         so);
 927
 928         loop = wl_display_get_event_loop(output->compositor->wl_display);
 929
 930         epoll_fd = wl_display_get_fd(so->parent.display);
 931         so->event_source =
 932                 wl_event_loop_add_fd(loop, epoll_fd, WL_EVENT_READABLE,
 933                                      shared_output_handle_event, so);
 934         if (!so->event_source) {
 935                 weston_log("Screen share failed: %m");
 936                 goto err_display;
 937         }
 938
 939         /* Ok, everything's created.  We should be good to go */
 940         wl_list_init(&so->shm.buffers);
 941         wl_list_init(&so->shm.free_buffers);
 942
 943         so->output = output;
 944         so->output_destroyed.notify = output_destroyed;
 945         wl_signal_add(&so->output->destroy_signal, &so->output_destroyed);
 946
 947         so->frame_listener.notify = shared_output_repainted;
 948         wl_signal_add(&output->frame_signal, &so->frame_listener);
 949         output->disable_planes++;
 950         weston_output_damage(output);
 951
 952         return so;
 953
 954 err_display:
 955         wl_list_for_each(seat, &so->seat_list, link)
 956                 ss_seat_destroy(seat);
 957         wl_display_disconnect(so->parent.display);
 958 err_alloc:
 959         free(so);
 960 err_close:
 961         close(parent_fd);
 962         return NULL;
 963 }
 964
 965 static void
 966 shared_output_destroy(struct shared_output *so)
 967 {
 968         struct ss_shm_buffer *buffer, *bnext;
 969
 970         so->output->disable_planes--;
 971
 972         wl_list_for_each_safe(buffer, bnext, &so->shm.buffers, link)
 973                 ss_shm_buffer_destroy(buffer);
 974         wl_list_for_each_safe(buffer, bnext, &so->shm.free_buffers, link)
 975                 ss_shm_buffer_destroy(buffer);
 976
 977         wl_display_disconnect(so->parent.display);
 978         wl_event_source_remove(so->event_source);
 979
 980         wl_list_remove(&so->output_destroyed.link);
 981         wl_list_remove(&so->frame_listener.link);
 982
 983         pixman_image_unref(so->cache_image);
 984         free(so->tmp_data);
 985
 986         free(so);
 987 }
 988
 989 static struct shared_output *
 990 weston_output_share(struct weston_output *output, const char* command)
 991 {
 992         int sv[2];
 993         char str[32];
 994         pid_t pid;
 995         sigset_t allsigs;
 996         char *const argv[] = {
 997           "/bin/sh",
 998           "-c",
 999           (char*)command,
1000           NULL
1001         };
1002
1003         if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, sv) < 0) {
1004                 weston_log("weston_output_share: socketpair failed: %m\n");
1005                 return NULL;
1006         }
1007
1008         pid = fork();
1009
1010         if (pid == -1) {
1011                 close(sv[0]);
1012                 close(sv[1]);
1013                 weston_log("weston_output_share: fork failed: %m\n");
1014                 return NULL;
1015         }
1016
1017         if (pid == 0) {
1018                 /* do not give our signal mask to the new process */
1019                 sigfillset(&allsigs);
1020                 sigprocmask(SIG_UNBLOCK, &allsigs, NULL);
1021
1022                 /* Launch clients as the user. Do not launch clients with
1023                  * wrong euid. */
1024                 if (seteuid(getuid()) == -1) {
1025                         weston_log("weston_output_share: setuid failed: %m\n");
1026                         abort();
1027                 }
1028
1029                 sv[1] = dup(sv[1]);
1030                 if (sv[1] == -1) {
1031                         weston_log("weston_output_share: dup failed: %m\n");
1032                         abort();
1033                 }
1034
1035                 snprintf(str, sizeof str, "%d", sv[1]);
1036                 setenv("WAYLAND_SERVER_SOCKET", str, 1);
1037
1038                 execv(argv[0], argv);
1039                 weston_log("weston_output_share: exec failed: %m\n");
1040                 abort();
1041         } else {
1042                 close(sv[1]);
1043                 return shared_output_create(output, sv[0]);
1044         }
1045
1046         return NULL;
1047 }
1048
1049 static struct weston_output *
1050 weston_output_find(struct weston_compositor *c, int32_t x, int32_t y)
1051 {
1052         struct weston_output *output;
1053
1054         wl_list_for_each(output, &c->output_list, link) {
1055                 if (x >= output->x && y >= output->y &&
1056                     x < output->x + output->width &&
1057                     y < output->y + output->height)
1058                         return output;
1059         }
1060
1061         return NULL;
1062 }
1063
1064 static void
1065 share_output_binding(struct weston_seat *seat, uint32_t time, uint32_t key,
1066                      void *data)
1067 {
1068         struct weston_output *output;
1069         struct screen_share *ss = data;
1070
1071         if (!seat->pointer) {
1072                 weston_log("Cannot pick output: Seat does not have pointer\n");
1073                 return;
1074         }
1075
1076         output = weston_output_find(seat->compositor,
1077                                     wl_fixed_to_int(seat->pointer->x),
1078                                     wl_fixed_to_int(seat->pointer->y));
1079         if (!output) {
1080                 weston_log("Cannot pick output: Pointer not on any output\n");
1081                 return;
1082         }
1083
1084         weston_output_share(output, ss->command);
1085 }
1086
1087 WL_EXPORT int
1088 module_init(struct weston_compositor *compositor,
1089             int *argc, char *argv[])
1090 {
1091         struct screen_share *ss;
1092         struct weston_config_section *section;
1093
1094         ss = zalloc(sizeof *ss);
1095         if (ss == NULL)
1096                 return -1;
1097         ss->compositor = compositor;
1098
1099         section = weston_config_get_section(compositor->config, "screen-share",
1100                                             NULL, NULL);
1101
1102         weston_config_section_get_string(section, "command", &ss->command, "");
1103
1104         weston_compositor_add_key_binding(compositor, KEY_S,
1105                                           MODIFIER_CTRL | MODIFIER_ALT,
1106                                           share_output_binding, ss);
1107         return 0;
1108 }