src/vdagent-x11-randr.c

   1 /*  vdagent-x11-randr.c vdagent Xrandr integration code
   2
   3     Copyright 2012 Red Hat, Inc.
   4
   5     Red Hat Authors:
   6     Alon Levy <alevy@redhat.com>
   7     Hans de Goede <hdegoede@redhat.com>
   8     Marc-André Lureau <mlureau@redhat.com>
   9
  10     This program is free software: you can redistribute it and/or modify
  11     it under the terms of the GNU General Public License as published by
  12     the Free Software Foundation, either version 3 of the License, or
  13     (at your option) any later version.
  14
  15     This program is distributed in the hope that it will be useful,
  16     but WITHOUT ANY WARRANTY; without even the implied warranty of
  17     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18     GNU General Public License for more details.
  19
  20     You should have received a copy of the GNU General Public License
  21     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include <string.h>
  25 #include <syslog.h>
  26 #include <stdlib.h>
  27
  28 #include <X11/extensions/Xinerama.h>
  29
  30 #include "vdagentd-proto.h"
  31 #include "vdagent-x11.h"
  32 #include "vdagent-x11-priv.h"
  33
  34 static int caught_error;
  35 static int (*old_error_handler)(Display *, XErrorEvent *);
  36
  37 static int error_handler(Display *display, XErrorEvent *error)
  38 {
  39     caught_error = 1;
  40     return 0;
  41 }
  42
  43 static void arm_error_handler(struct vdagent_x11 *x11)
  44 {
  45     caught_error = 0;
  46     XSync(x11->display, False);
  47     old_error_handler = XSetErrorHandler(error_handler);
  48 }
  49
  50 static int check_error_handler(struct vdagent_x11 *x11)
  51 {
  52     int error;
  53
  54     XSync(x11->display, False);
  55     XSetErrorHandler(old_error_handler);
  56     error = caught_error;
  57     caught_error = 0;
  58
  59     return error;
  60 }
  61
  62 static XRRModeInfo *mode_from_id(struct vdagent_x11 *x11, int id)
  63 {
  64     int i;
  65
  66     for (i = 0 ; i < x11->randr.res->nmode ; ++i) {
  67         if (id == x11->randr.res->modes[i].id) {
  68             return &x11->randr.res->modes[i];
  69         }
  70     }
  71     return NULL;
  72 }
  73
  74 static XRRCrtcInfo *crtc_from_id(struct vdagent_x11 *x11, int id)
  75 {
  76     int i;
  77
  78     for (i = 0 ; i < x11->randr.res->ncrtc ; ++i) {
  79         if (id == x11->randr.res->crtcs[i]) {
  80             return x11->randr.crtcs[i];
  81         }
  82     }
  83     return NULL;
  84 }
  85
  86 static void free_randr_resources(struct vdagent_x11 *x11)
  87 {
  88     int i;
  89
  90     if (!x11->randr.res) {
  91         return;
  92     }
  93     if (x11->randr.outputs != NULL) {
  94         for (i = 0 ; i < x11->randr.res->noutput; ++i) {
  95             XRRFreeOutputInfo(x11->randr.outputs[i]);
  96         }
  97         free(x11->randr.outputs);
  98     }
  99     if (x11->randr.crtcs != NULL) {
 100         for (i = 0 ; i < x11->randr.res->ncrtc; ++i) {
 101             XRRFreeCrtcInfo(x11->randr.crtcs[i]);
 102         }
 103         free(x11->randr.crtcs);
 104     }
 105     XRRFreeScreenResources(x11->randr.res);
 106     x11->randr.res = NULL;
 107     x11->randr.outputs = NULL;
 108     x11->randr.crtcs = NULL;
 109 }
 110
 111 static void update_randr_res(struct vdagent_x11 *x11)
 112 {
 113     int i;
 114
 115     free_randr_resources(x11);
 116     /* Note: we don't need XRRGetScreenResourcesCurrent since we cache the changes */
 117     x11->randr.res = XRRGetScreenResources(x11->display, x11->root_window);
 118     x11->randr.outputs = malloc(x11->randr.res->noutput * sizeof(*x11->randr.outputs));
 119     x11->randr.crtcs = malloc(x11->randr.res->ncrtc * sizeof(*x11->randr.crtcs));
 120     for (i = 0 ; i < x11->randr.res->noutput; ++i) {
 121         x11->randr.outputs[i] = XRRGetOutputInfo(x11->display, x11->randr.res,
 122                                                  x11->randr.res->outputs[i]);
 123     }
 124     for (i = 0 ; i < x11->randr.res->ncrtc; ++i) {
 125         x11->randr.crtcs[i] = XRRGetCrtcInfo(x11->display, x11->randr.res,
 126                                              x11->randr.res->crtcs[i]);
 127     }
 128     /* XXX is this dynamic? should it be cached? */
 129     if (XRRGetScreenSizeRange(x11->display, x11->root_window,
 130                               &x11->randr.min_width,
 131                               &x11->randr.min_height,
 132                               &x11->randr.max_width,
 133                               &x11->randr.max_height) != 1) {
 134         syslog(LOG_ERR, "update_randr_res: RRGetScreenSizeRange failed");
 135     }
 136 }
 137
 138 void vdagent_x11_randr_init(struct vdagent_x11 *x11)
 139 {
 140     int i;
 141
 142     if (XRRQueryExtension(x11->display, &i, &i)) {
 143         x11->has_xrandr = 1;
 144         update_randr_res(x11);
 145         XRRQueryVersion(x11->display, &x11->xrandr_major, &x11->xrandr_minor);
 146     } else {
 147         x11->randr.res = NULL;
 148     }
 149
 150     if (XineramaQueryExtension(x11->display, &i, &i))
 151         x11->has_xinerama = 1;
 152
 153     switch (x11->has_xrandr << 4 | x11->has_xinerama) {
 154     case 0x00:
 155         syslog(LOG_ERR, "Neither Xrandr nor Xinerama found, assuming single monitor setup");
 156         break;
 157     case 0x01:
 158         if (x11->debug)
 159             syslog(LOG_DEBUG, "Found Xinerama extension without Xrandr, assuming Xinerama multi monitor setup");
 160         break;
 161     case 0x10:
 162         syslog(LOG_ERR, "Found Xrandr but no Xinerama, weird!");
 163         break;
 164     case 0x11:
 165         /* Standard xrandr setup, nothing to see here */
 166         break;
 167     }
 168 }
 169
 170 static XRRModeInfo *
 171 find_mode_by_name (struct vdagent_x11 *x11, char *name)
 172 {
 173     int         m;
 174     XRRModeInfo        *ret = NULL;
 175
 176     for (m = 0; m < x11->randr.res->nmode; m++) {
 177         XRRModeInfo *mode = &x11->randr.res->modes[m];
 178         if (!strcmp (name, mode->name)) {
 179             ret = mode;
 180             break;
 181         }
 182     }
 183     return ret;
 184 }
 185
 186 static XRRModeInfo *
 187 find_mode_by_size (struct vdagent_x11 *x11, int width, int height)
 188 {
 189     int         m;
 190     XRRModeInfo        *ret = NULL;
 191
 192     for (m = 0; m < x11->randr.res->nmode; m++) {
 193         XRRModeInfo *mode = &x11->randr.res->modes[m];
 194         if (mode->width == width && mode->height == height) {
 195             ret = mode;
 196             break;
 197         }
 198     }
 199     return ret;
 200 }
 201
 202 static void delete_mode(struct vdagent_x11 *x11, int output_index, const char* name)
 203 {
 204     int m;
 205     XRRModeInfo *mode;
 206     XRROutputInfo *output_info;
 207     XRRCrtcInfo *crtc_info;
 208     RRCrtc crtc;
 209     int current_mode = -1;
 210
 211     output_info = x11->randr.outputs[output_index];
 212     if (output_info->ncrtc != 1) {
 213         syslog(LOG_ERR, "output has %d crtcs, expected exactly 1, "
 214                "failed to delete mode", output_info->ncrtc);
 215         return;
 216     }
 217     crtc_info = crtc_from_id(x11, output_info->crtcs[0]);
 218     current_mode = crtc_info->mode;
 219     crtc = output_info->crtc;
 220     for (m = 0 ; m < x11->randr.res->nmode; ++m) {
 221         mode = &x11->randr.res->modes[m];
 222         if (strcmp(mode->name, name) == 0)
 223             break;
 224     }
 225     if (m < x11->randr.res->nmode) {
 226         arm_error_handler(x11);
 227         XRRDeleteOutputMode (x11->display, x11->randr.res->outputs[output_index],
 228                              mode->id);
 229         XRRDestroyMode (x11->display, mode->id);
 230         // ignore race error, if mode is created by others
 231         check_error_handler(x11);
 232     }
 233
 234     /* silly to update everytime for more then one monitor */
 235     update_randr_res(x11);
 236 }
 237
 238 static void set_reduced_cvt_mode(XRRModeInfo *mode, int width, int height)
 239 {
 240     /* Code taken from hw/xfree86/modes/xf86cvt.c
 241      * See that file for lineage. Originated in public domain code
 242      * Would be nice if xorg exported this in a library */
 243
 244     /* 1) top/bottom margin size (% of height) - default: 1.8 */
 245 #define CVT_MARGIN_PERCENTAGE 1.8
 246
 247     /* 2) character cell horizontal granularity (pixels) - default 8 */
 248 #define CVT_H_GRANULARITY 8
 249
 250     /* 4) Minimum vertical porch (lines) - default 3 */
 251 #define CVT_MIN_V_PORCH 3
 252
 253     /* 4) Minimum number of vertical back porch lines - default 6 */
 254 #define CVT_MIN_V_BPORCH 6
 255
 256     /* Pixel Clock step (kHz) */
 257 #define CVT_CLOCK_STEP 250
 258
 259     /* Minimum vertical blanking interval time (µs) - default 460 */
 260 #define CVT_RB_MIN_VBLANK 460.0
 261
 262     /* Fixed number of clocks for horizontal sync */
 263 #define CVT_RB_H_SYNC 32.0
 264
 265     /* Fixed number of clocks for horizontal blanking */
 266 #define CVT_RB_H_BLANK 160.0
 267
 268     /* Fixed number of lines for vertical front porch - default 3 */
 269 #define CVT_RB_VFPORCH 3
 270
 271     int VBILines;
 272     float VFieldRate = 60.0;
 273     int VSync;
 274     float HPeriod;
 275
 276     /* 2. Horizontal pixels */
 277     width = width - (width % CVT_H_GRANULARITY);
 278
 279     mode->width = width;
 280     mode->height = height;
 281     VSync = 10;
 282
 283     /* 8. Estimate Horizontal period. */
 284     HPeriod = ((float) (1000000.0 / VFieldRate - CVT_RB_MIN_VBLANK)) / height;
 285
 286     /* 9. Find number of lines in vertical blanking */
 287     VBILines = ((float) CVT_RB_MIN_VBLANK) / HPeriod + 1;
 288
 289     /* 10. Check if vertical blanking is sufficient */
 290     if (VBILines < (CVT_RB_VFPORCH + VSync + CVT_MIN_V_BPORCH))
 291         VBILines = CVT_RB_VFPORCH + VSync + CVT_MIN_V_BPORCH;
 292
 293     /* 11. Find total number of lines in vertical field */
 294     mode->vTotal = height + VBILines;
 295
 296     /* 12. Find total number of pixels in a line */
 297     mode->hTotal = mode->width + CVT_RB_H_BLANK;
 298
 299     /* Fill in HSync values */
 300     mode->hSyncEnd = mode->width + CVT_RB_H_BLANK / 2;
 301     mode->hSyncStart = mode->hSyncEnd - CVT_RB_H_SYNC;
 302
 303     /* Fill in VSync values */
 304     mode->vSyncStart = mode->height + CVT_RB_VFPORCH;
 305     mode->vSyncEnd = mode->vSyncStart + VSync;
 306
 307     /* 15/13. Find pixel clock frequency (kHz for xf86) */
 308     mode->dotClock = mode->hTotal * 1000.0 / HPeriod;
 309     mode->dotClock -= mode->dotClock % CVT_CLOCK_STEP;
 310
 311 }
 312
 313 static XRRModeInfo *create_new_mode(struct vdagent_x11 *x11, int output_index,
 314                                     int width, int height)
 315 {
 316     char modename[20];
 317     XRRModeInfo mode;
 318
 319     snprintf(modename, sizeof(modename), "%dx%d-%d", width, height, output_index);
 320     mode.hSkew = 0;
 321     mode.name = modename;
 322     mode.nameLength = strlen(mode.name);
 323     set_reduced_cvt_mode(&mode, width, height);
 324     mode.modeFlags = 0;
 325     mode.id = 0;
 326     arm_error_handler(x11);
 327     XRRCreateMode (x11->display, x11->root_window, &mode);
 328     // ignore race error, if mode is created by others
 329     check_error_handler(x11);
 330
 331     /* silly to update everytime for more then one monitor */
 332     update_randr_res(x11);
 333
 334     return find_mode_by_name(x11, modename);
 335 }
 336
 337 static int xrandr_add_and_set(struct vdagent_x11 *x11, int output, int x, int y,
 338                               int width, int height)
 339 {
 340     XRRModeInfo *mode;
 341     int xid;
 342     Status s;
 343     RROutput outputs[1];
 344     char modename[20];
 345
 346     if (!x11->randr.res || output >= x11->randr.res->noutput || output < 0) {
 347         syslog(LOG_ERR, "%s: program error: missing RANDR or bad output",
 348                __FUNCTION__);
 349         return 0;
 350     }
 351     if (x11->set_crtc_config_not_functional) {
 352         /* fail, set_best_mode will find something close. */
 353         return 0;
 354     }
 355     xid = x11->randr.res->outputs[output];
 356     mode = find_mode_by_size(x11, width, height);
 357     if (!mode) {
 358         mode = create_new_mode(x11, output, width, height);
 359     }
 360     if (!mode) {
 361         syslog(LOG_ERR, "failed to add a new mode");
 362         return 0;
 363     }
 364     XRRAddOutputMode(x11->display, xid, mode->id);
 365     outputs[0] = xid;
 366     s = XRRSetCrtcConfig(x11->display, x11->randr.res, x11->randr.res->crtcs[output],
 367                          CurrentTime, x, y, mode->id, RR_Rotate_0, outputs,
 368                          1);
 369
 370     if (s != RRSetConfigSuccess) {
 371         syslog(LOG_ERR, "failed to XRRSetCrtcConfig");
 372         x11->set_crtc_config_not_functional = 1;
 373         return 0;
 374     }
 375
 376     /* clean the previous name, if any */
 377     snprintf(modename, sizeof(modename), "%dx%d-%d", x11->width, x11->height, output);
 378     delete_mode(x11, output, modename);
 379
 380     return 1;
 381 }
 382
 383 static void xrandr_disable_output(struct vdagent_x11 *x11, int output)
 384 {
 385     Status s;
 386
 387     if (!x11->randr.res || output >= x11->randr.res->noutput || output < 0) {
 388         syslog(LOG_ERR, "%s: program error: missing RANDR or bad output",
 389                __FUNCTION__);
 390         return;
 391     }
 392
 393     s = XRRSetCrtcConfig(x11->display, x11->randr.res,
 394                          x11->randr.res->crtcs[output],
 395                          CurrentTime, 0, 0, None, RR_Rotate_0,
 396                          NULL, 0);
 397
 398     if (s != RRSetConfigSuccess)
 399         syslog(LOG_ERR, "failed to disable monitor");
 400 }
 401
 402 static int set_screen_to_best_size(struct vdagent_x11 *x11, int width, int height,
 403                                    int *out_width, int *out_height){
 404     int i, num_sizes = 0;
 405     int best = -1;
 406     unsigned int closest_diff = -1;
 407     XRRScreenSize *sizes;
 408     XRRScreenConfiguration *config;
 409     Rotation rotation;
 410
 411     sizes = XRRSizes(x11->display, x11->screen, &num_sizes);
 412     if (!sizes || !num_sizes) {
 413         syslog(LOG_ERR, "XRRSizes failed");
 414         return 0;
 415     }
 416     if (x11->debug)
 417         syslog(LOG_DEBUG, "set_screen_to_best_size found %d modes\n", num_sizes);
 418
 419     /* Find the closest size which will fit within the monitor */
 420     for (i = 0; i < num_sizes; i++) {
 421         if (sizes[i].width  > width ||
 422             sizes[i].height > height)
 423             continue; /* Too large for the monitor */
 424
 425         unsigned int wdiff = width  - sizes[i].width;
 426         unsigned int hdiff = height - sizes[i].height;
 427         unsigned int diff = wdiff * wdiff + hdiff * hdiff;
 428         if (diff < closest_diff) {
 429             closest_diff = diff;
 430             best = i;
 431         }
 432     }
 433
 434     if (best == -1) {
 435         syslog(LOG_ERR, "no suitable resolution found for monitor");
 436         return 0;
 437     }
 438
 439     config = XRRGetScreenInfo(x11->display, x11->root_window);
 440     if(!config) {
 441         syslog(LOG_ERR, "get screen info failed");
 442         return 0;
 443     }
 444     XRRConfigCurrentConfiguration(config, &rotation);
 445     XRRSetScreenConfig(x11->display, config, x11->root_window, best,
 446                        rotation, CurrentTime);
 447     XRRFreeScreenConfigInfo(config);
 448
 449     if (x11->debug)
 450         syslog(LOG_DEBUG, "set_screen_to_best_size set size to: %dx%d\n",
 451                sizes[best].width, sizes[best].height);
 452     *out_width = sizes[best].width;
 453     *out_height = sizes[best].height;
 454     return 1;
 455 }
 456
 457 void vdagent_x11_randr_handle_root_size_change(struct vdagent_x11 *x11,
 458                                                int width, int height)
 459 {
 460     if (width == x11->width && height == x11->height) {
 461         return;
 462     }
 463
 464     x11->width  = width;
 465     x11->height = height;
 466     if (!x11->dont_send_guest_xorg_res) {
 467         vdagent_x11_send_daemon_guest_xorg_res(x11);
 468     }
 469 }
 470
 471 static uint32_t min_int(uint32_t x, uint32_t y)
 472 {
 473     return x > y ? y : x;
 474 }
 475
 476 static uint32_t max_int(uint32_t x, uint32_t y)
 477 {
 478     return x > y ? x : y;
 479 }
 480
 481 static int constrain_to_range(uint32_t low, uint32_t *val, uint32_t high)
 482 {
 483     if (low <= *val && *val <= high) {
 484         return 0;
 485     }
 486     if (low > *val) {
 487         *val = low;
 488     }
 489     if (*val > high) {
 490         *val = high;
 491     }
 492     return 1;
 493 }
 494
 495 static void constrain_to_screen(struct vdagent_x11 *x11, uint32_t *w, uint32_t *h)
 496 {
 497     uint32_t lx, ly, hx, hy;
 498     uint32_t orig_h = *h;
 499     uint32_t orig_w = *w;
 500
 501     lx = x11->randr.min_width;
 502     hx = x11->randr.max_width;
 503     ly = x11->randr.min_height;
 504     hy = x11->randr.max_height;
 505     if (constrain_to_range(lx, w, hx)) {
 506         syslog(LOG_ERR, "width not in driver range: ! %d < %d < %d",
 507                lx, orig_w, hx);
 508     }
 509     if (constrain_to_range(ly, h, hy)) {
 510         syslog(LOG_ERR, "height not in driver range: ! %d < %d < %d",
 511                ly, orig_h, hy);
 512     }
 513 }
 514
 515 /*
 516  * The agent config doesn't contain a primary size, just the monitors, but
 517  * we need to total size as well, to make sure we have enough memory and
 518  * because X needs it.
 519  *
 520  * At the same pass constrain any provided size to what the server accepts.
 521  *
 522  * Exit axioms:
 523  *  x >= 0, y >= 0 for all x, y in mon_config
 524  *  max_width >= width >= min_width,
 525  *  max_height >= height >= min_height for all monitors in mon_config
 526  */
 527 static void zero_base_monitors(struct vdagent_x11 *x11,
 528                                VDAgentMonitorsConfig *mon_config,
 529                                uint32_t *width, uint32_t *height)
 530 {
 531     int i = 0;
 532     uint32_t min_x, min_y, max_x, max_y;
 533     uint32_t *mon_height, *mon_width;
 534
 535     mon_width = &mon_config->monitors[i].width;
 536     mon_height = &mon_config->monitors[i].height;
 537     constrain_to_screen(x11, mon_width, mon_height);
 538     min_x = mon_config->monitors[0].x;
 539     min_y = mon_config->monitors[0].y;
 540     max_x = mon_config->monitors[0].width + min_x;
 541     max_y = mon_config->monitors[0].height + min_y;
 542     for (++i ; i < mon_config->num_of_monitors; ++i) {
 543         mon_width = &mon_config->monitors[i].width;
 544         mon_height = &mon_config->monitors[i].height;
 545         constrain_to_screen(x11, mon_width, mon_height);
 546         min_x = min_int(mon_config->monitors[i].x, min_x);
 547         min_y = min_int(mon_config->monitors[i].y, min_y);
 548         max_x = max_int(mon_config->monitors[i].x + *mon_width, max_x);
 549         max_y = max_int(mon_config->monitors[i].y + *mon_height, max_y);
 550     }
 551     if (min_x != 0 || min_y != 0) {
 552         syslog(LOG_ERR, "%s: agent config %d,%d rooted, adjusting to 0,0.",
 553                __FUNCTION__, min_x, min_y);
 554         for (i = 0 ; i < mon_config->num_of_monitors; ++i) {
 555             mon_config->monitors[i].x -= min_x;
 556             mon_config->monitors[i].y -= min_y;
 557         }
 558     }
 559     max_x -= min_x;
 560     max_y -= min_y;
 561     *width = max_x;
 562     *height = max_y;
 563 }
 564
 565 static int same_monitor_configs(struct vdagent_x11 *x11, VDAgentMonitorsConfig *mon)
 566 {
 567     int i;
 568     XRRModeInfo *mode;
 569     XRRCrtcInfo *crtc;
 570     VDAgentMonConfig *client_mode;
 571     XRRScreenResources *res = x11->randr.res;
 572
 573     if (res->noutput > res->ncrtc) {
 574         syslog(LOG_ERR, "error: unexpected noutput > ncrtc in driver");
 575         return 0;
 576     }
 577
 578     if (mon->num_of_monitors > res->noutput) {
 579         for (i = res->noutput; i < mon->num_of_monitors; i++) {
 580             if (mon->monitors[i].width || mon->monitors[i].height) {
 581                 syslog(LOG_WARNING,
 582                        "warning: unexpected client request: #mon %d > driver output %d",
 583                        mon->num_of_monitors, res->noutput);
 584                 break;
 585             }
 586         }
 587         mon->num_of_monitors = res->noutput;
 588     }
 589
 590     for (i = 0 ; i < mon->num_of_monitors; ++i) {
 591         if (x11->randr.outputs[i]->ncrtc == 0) {
 592             return 0;
 593         }
 594         if (x11->randr.outputs[i]->ncrtc != 1) {
 595             syslog(LOG_ERR, "error: unexpected driver config, ncrtc %d != 1",
 596                    x11->randr.outputs[i]->ncrtc);
 597             return 0;
 598         }
 599         crtc = crtc_from_id(x11, x11->randr.outputs[i]->crtcs[0]);
 600         if (!crtc) {
 601             syslog(LOG_ERR, "error: inconsistent or stale data from X");
 602             return 0;
 603         }
 604         client_mode = &mon->monitors[i];
 605         mode = mode_from_id(x11, crtc->mode);
 606         if (!mode) {
 607             return 0;
 608         }
 609         /* NOTE: we don't compare depth. */
 610         /* NOTE 2: width set by X is a multiple of 8, so ignore lower 3 bits */
 611         if ((mode->width & ~7) != (client_mode->width & ~7) ||
 612             mode->height != client_mode->height ||
 613             (crtc->x & ~7) != (client_mode->x & ~7) ||
 614             crtc->y != client_mode->y) {
 615             return 0;
 616         }
 617     }
 618     return 1;
 619 }
 620
 621 static void dump_monitors_config(struct vdagent_x11 *x11,
 622                                  VDAgentMonitorsConfig *mon_config,
 623                                  const char *prefix)
 624 {
 625     int i;
 626     VDAgentMonConfig *m;
 627
 628     syslog(LOG_DEBUG, "%s: %d, %x", prefix, mon_config->num_of_monitors,
 629            mon_config->flags);
 630     for (i = 0 ; i < mon_config->num_of_monitors; ++i) {
 631         m = &mon_config->monitors[i];
 632         syslog(LOG_DEBUG, "received monitor %d config %dx%d+%d+%d", i,
 633                m->width, m->height, m->x, m->y);
 634     }
 635 }
 636
 637 /*
 638  * Set monitor configuration according to client request.
 639  *
 640  * On exit send current configuration to client, regardless of error.
 641  *
 642  * Errors:
 643  *  screen size too large for driver to handle. (we set the largest/smallest possible)
 644  *  no randr support in X server.
 645  *  invalid configuration request from client.
 646  */
 647 void vdagent_x11_set_monitor_config(struct vdagent_x11 *x11,
 648                                     VDAgentMonitorsConfig *mon_config)
 649 {
 650     int i;
 651     int width, height;
 652     int x, y;
 653     uint32_t primary_w, primary_h;
 654
 655     if (!x11->has_xrandr)
 656         goto exit;
 657
 658     if (mon_config->num_of_monitors < 1) {
 659         syslog(LOG_ERR, "client sent invalid monitor config number %d",
 660                mon_config->num_of_monitors);
 661         goto exit;
 662     }
 663
 664     if (same_monitor_configs(x11, mon_config)) {
 665         goto exit;
 666     }
 667
 668     if (x11->debug) {
 669         dump_monitors_config(x11, mon_config, "from guest");
 670     }
 671
 672     zero_base_monitors(x11, mon_config, &primary_w, &primary_h);
 673
 674     constrain_to_screen(x11, &primary_w, &primary_h);
 675
 676     if (x11->debug) {
 677         dump_monitors_config(x11, mon_config, "after zeroing");
 678     }
 679
 680     for (i = mon_config->num_of_monitors; i < x11->randr.res->noutput; i++)
 681         xrandr_disable_output(x11, i);
 682
 683     for (i = 0; i < mon_config->num_of_monitors; ++i) {
 684         /* Try to create the requested resolution */
 685         width = mon_config->monitors[i].width;
 686         height = mon_config->monitors[i].height;
 687         x = mon_config->monitors[i].x;
 688         y = mon_config->monitors[i].y;
 689         if (!xrandr_add_and_set(x11, i, x, y, width, height) &&
 690                 mon_config->num_of_monitors == 1) {
 691             set_screen_to_best_size(x11, width, height,
 692                                     &primary_w, &primary_h);
 693             goto update;
 694         }
 695     }
 696
 697     if (primary_w != x11->width || primary_h != x11->height) {
 698         arm_error_handler(x11);
 699         XRRSetScreenSize(x11->display, x11->root_window, primary_w, primary_h,
 700                          DisplayWidthMM(x11->display, x11->screen),
 701                          DisplayHeightMM(x11->display, x11->screen));
 702
 703         x11->set_crtc_config_not_functional = check_error_handler(x11);
 704     }
 705
 706 update:
 707     update_randr_res(x11);
 708     x11->width = primary_w;
 709     x11->height = primary_h;
 710
 711     /* Flush output buffers and consume any pending events (ConfigureNotify) */
 712     x11->dont_send_guest_xorg_res = 1;
 713     vdagent_x11_do_read(x11);
 714     x11->dont_send_guest_xorg_res = 0;
 715
 716 exit:
 717     vdagent_x11_send_daemon_guest_xorg_res(x11);
 718
 719     /* Flush output buffers and consume any pending events */
 720     vdagent_x11_do_read(x11);
 721 }
 722
 723 void vdagent_x11_send_daemon_guest_xorg_res(struct vdagent_x11 *x11)
 724 {
 725     struct vdagentd_guest_xorg_resolution *res = NULL;
 726     XineramaScreenInfo *screen_info = NULL;
 727     int i, screen_count = 0;
 728
 729     if (x11->has_xinerama) {
 730         /* Xinerama reports the same information RANDR reports, so stay
 731          * with Xinerama for support of Xinerama only setups */
 732         screen_info = XineramaQueryScreens(x11->display, &screen_count);
 733     }
 734
 735     if (screen_count == 0)
 736         screen_count = 1;
 737
 738     res = malloc(screen_count * sizeof(*res));
 739     if (!res) {
 740         syslog(LOG_ERR, "out of memory while trying to send resolutions, not sending resolutions.");
 741         if (screen_info)
 742             XFree(screen_info);
 743         return;
 744     }
 745
 746     if (screen_info) {
 747         for (i = 0; i < screen_count; i++) {
 748             if (screen_info[i].screen_number >= screen_count) {
 749                 syslog(LOG_ERR, "Invalid screen number in xinerama screen info (%d >= %d)",
 750                        screen_info[i].screen_number, screen_count);
 751                 XFree(screen_info);
 752                 free(res);
 753                 return;
 754             }
 755             res[screen_info[i].screen_number].width = screen_info[i].width;
 756             res[screen_info[i].screen_number].height = screen_info[i].height;
 757             res[screen_info[i].screen_number].x = screen_info[i].x_org;
 758             res[screen_info[i].screen_number].y = screen_info[i].y_org;
 759         }
 760         XFree(screen_info);
 761     } else {
 762         res[0].width  = x11->width;
 763         res[0].height = x11->height;
 764         res[0].x = 0;
 765         res[0].y = 0;
 766     }
 767
 768     udscs_write(x11->vdagentd, VDAGENTD_GUEST_XORG_RESOLUTION, x11->width,
 769                 x11->height, (uint8_t *)res, screen_count * sizeof(*res));
 770     free(res);
 771 }