git.sur5r.net Git - i3/i3/blob - src/layout.c

   1 /*
   2  * vim:ts=8:expandtab
   3  *
   4  * i3 - an improved dynamic tiling window manager
   5  *
   6  * © 2009 Michael Stapelberg and contributors
   7  *
   8  * See file LICENSE for license information.
   9  *
  10  * layout.c: Functions handling layout/drawing of window decorations
  11  *
  12  */
  13 #include <stdio.h>
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include <xcb/xcb.h>
  17 #include <assert.h>
  18 #include <math.h>
  19
  20 #include "config.h"
  21 #include "i3.h"
  22 #include "xcb.h"
  23 #include "table.h"
  24 #include "util.h"
  25 #include "xinerama.h"
  26 #include "layout.h"
  27 #include "client.h"
  28
  29 /*
  30  * Updates *destination with new_value and returns true if it was changed or false
  31  * if it was the same
  32  *
  33  */
  34 static bool update_if_necessary(uint32_t *destination, const uint32_t new_value) {
  35         uint32_t old_value = *destination;
  36
  37         return ((*destination = new_value) != old_value);
  38 }
  39
  40 /*
  41  * Gets the unoccupied space (= space which is available for windows which were resized by the user)
  42  * for the given row. This is necessary to render both, customly resized windows and never touched
  43  * windows correctly, meaning that the aspect ratio will be maintained when opening new windows.
  44  *
  45  */
  46 int get_unoccupied_x(Workspace *workspace) {
  47         int unoccupied = workspace->rect.width;
  48         float default_factor = ((float)workspace->rect.width / workspace->cols) / workspace->rect.width;
  49
  50         LOG("get_unoccupied_x(), starting with %d, default_factor = %f\n", unoccupied, default_factor);
  51
  52         for (int cols = 0; cols < workspace->cols; cols++) {
  53                 LOG("width_factor[%d] = %f\n", cols, workspace->width_factor[cols]);
  54
  55                 if (workspace->width_factor[cols] == 0)
  56                         unoccupied -= workspace->rect.width * default_factor;
  57         }
  58
  59         LOG("unoccupied space: %d\n", unoccupied);
  60         return unoccupied;
  61 }
  62
  63 /* See get_unoccupied_x() */
  64 int get_unoccupied_y(Workspace *workspace, int col) {
  65         int unoccupied = workspace->rect.height;
  66         float default_factor = ((float)workspace->rect.height / workspace->rows) / workspace->rect.height;
  67
  68         LOG("get_unoccupied_y(), starting with %d, default_factor = %f\n", unoccupied, default_factor);
  69
  70         for (int rows = 0; rows < workspace->rows; rows++) {
  71                 LOG("height_factor[%d] = %f\n", rows, workspace->height_factor[rows]);
  72                 if (workspace->height_factor[rows] == 0)
  73                         unoccupied -= workspace->rect.height * default_factor;
  74         }
  75
  76         LOG("unoccupied space: %d\n", unoccupied);
  77         return unoccupied;
  78 }
  79
  80 /*
  81  * Redecorates the given client correctly by checking if it’s in a stacking container and
  82  * re-rendering the stack window or just calling decorate_window if it’s not in a stacking
  83  * container.
  84  *
  85  */
  86 void redecorate_window(xcb_connection_t *conn, Client *client) {
  87         if (client->container != NULL && client->container->mode == MODE_STACK) {
  88                 render_container(conn, client->container);
  89                 /* We clear the frame to generate exposure events, because the color used
  90                    in drawing may be different */
  91                 xcb_clear_area(conn, true, client->frame, 0, 0, client->rect.width, client->rect.height);
  92         } else decorate_window(conn, client, client->frame, client->titlegc, 0);
  93         xcb_flush(conn);
  94 }
  95
  96 /*
  97  * (Re-)draws window decorations for a given Client onto the given drawable/graphic context.
  98  * When in stacking mode, the window decorations are drawn onto an own window.
  99  *
 100  */
 101 void decorate_window(xcb_connection_t *conn, Client *client, xcb_drawable_t drawable, xcb_gcontext_t gc, int offset) {
 102         i3Font *font = load_font(conn, config.font);
 103         int decoration_height = font->height + 2 + 2;
 104         struct Colortriple *color;
 105
 106         /* Clients without a container (docks) won’t get decorated */
 107         if (client->dock)
 108                 return;
 109
 110         LOG("redecorating child %08x\n", client->child);
 111         if (client_is_floating(client) || client->container->currently_focused == client) {
 112                 /* Distinguish if the window is currently focused… */
 113                 if (client_is_floating(client) || CUR_CELL->currently_focused == client)
 114                         color = &(config.client.focused);
 115                 /* …or if it is the focused window in a not focused container */
 116                 else color = &(config.client.focused_inactive);
 117         } else color = &(config.client.unfocused);
 118
 119         /* Our plan is the following:
 120            - Draw a rect around the whole client in color->background
 121            - Draw two lines in a lighter color
 122            - Draw the window’s title
 123          */
 124
 125         /* Draw a rectangle in background color around the window */
 126         xcb_change_gc_single(conn, gc, XCB_GC_FOREGROUND, color->background);
 127
 128         /* In stacking mode, we only render the rect for this specific decoration */
 129         if (client->container != NULL && client->container->mode == MODE_STACK) {
 130                 /* We need to use the container’s width because it is the more recent value - when
 131                    in stacking mode, clients get reconfigured only on demand (the not active client
 132                    is not reconfigured), so the client’s rect.width would be wrong */
 133                 xcb_rectangle_t rect = {0, offset, client->container->width, offset + decoration_height };
 134                 xcb_poly_fill_rectangle(conn, drawable, gc, 1, &rect);
 135         } else {
 136                 xcb_rectangle_t rect = {0, 0, client->rect.width, client->rect.height};
 137                 xcb_poly_fill_rectangle(conn, drawable, gc, 1, &rect);
 138
 139                 /* Draw the inner background to have a black frame around clients (such as mplayer)
 140                    which cannot be resized exactly in our frames and therefore are centered */
 141                 xcb_change_gc_single(conn, client->titlegc, XCB_GC_FOREGROUND, get_colorpixel(conn, "#000000"));
 142                 xcb_rectangle_t crect = {2, decoration_height,
 143                                          client->rect.width - (2 + 2), client->rect.height - 2 - decoration_height};
 144                 xcb_poly_fill_rectangle(conn, client->frame, client->titlegc, 1, &crect);
 145         }
 146
 147         /* Draw the lines */
 148         xcb_draw_line(conn, drawable, gc, color->border, 0, offset, client->rect.width, offset);
 149         xcb_draw_line(conn, drawable, gc, color->border, 2, offset + font->height + 3,
 150                       client->rect.width - 3, offset + font->height + 3);
 151
 152         /* If the client has a title, we draw it */
 153         if (client->name != NULL) {
 154                 /* Draw the font */
 155                 uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND | XCB_GC_FONT;
 156                 uint32_t values[] = { color->text, color->background, font->id };
 157                 xcb_change_gc(conn, gc, mask, values);
 158
 159                 /* name_len == -1 means this is a legacy application which does not specify _NET_WM_NAME,
 160                    and we don’t handle the old window name (COMPOUND_TEXT) but only _NET_WM_NAME, which
 161                    is UTF-8 */
 162                 if (client->name_len == -1)
 163                         xcb_image_text_8(conn, strlen(client->name), drawable, gc, 3 /* X */,
 164                                          offset + font->height /* Y = baseline of font */, client->name);
 165                 else
 166                         xcb_image_text_16(conn, client->name_len, drawable, gc, 3 /* X */,
 167                                           offset + font->height /* Y = baseline of font */, (xcb_char2b_t*)client->name);
 168         }
 169 }
 170
 171 /*
 172  * Pushes the client’s x and y coordinates to X11
 173  *
 174  */
 175 void reposition_client(xcb_connection_t *conn, Client *client) {
 176         LOG("frame 0x%08x needs to be pushed to %dx%d\n", client->frame, client->rect.x, client->rect.y);
 177         /* Note: We can use a pointer to client->x like an array of uint32_ts
 178            because it is followed by client->y by definition */
 179         xcb_configure_window(conn, client->frame, XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y, &(client->rect.x));
 180 }
 181
 182 /*
 183  * Pushes the client’s width/height to X11 and resizes the child window
 184  *
 185  */
 186 void resize_client(xcb_connection_t *conn, Client *client) {
 187         i3Font *font = load_font(conn, config.font);
 188
 189         LOG("resizing client 0x%08x to %d x %d\n", client->frame, client->rect.width, client->rect.height);
 190         xcb_configure_window(conn, client->frame,
 191                         XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT,
 192                         &(client->rect.width));
 193
 194         /* Adjust the position of the child inside its frame.
 195          * The coordinates of the child are relative to its frame, we
 196          * add a border of 2 pixel to each value */
 197         uint32_t mask = XCB_CONFIG_WINDOW_X |
 198                         XCB_CONFIG_WINDOW_Y |
 199                         XCB_CONFIG_WINDOW_WIDTH |
 200                         XCB_CONFIG_WINDOW_HEIGHT;
 201         Rect *rect = &(client->child_rect);
 202         switch ((client->container != NULL ? client->container->mode : MODE_DEFAULT)) {
 203                 case MODE_STACK:
 204                         rect->x = 2;
 205                         rect->y = 0;
 206                         rect->width = client->rect.width - (2 + 2);
 207                         rect->height = client->rect.height - 2;
 208                         break;
 209                 default:
 210                         if (client->titlebar_position == TITLEBAR_OFF) {
 211                                 rect->x = 0;
 212                                 rect->y = 0;
 213                                 rect->width = client->rect.width;
 214                                 rect->height = client->rect.height;
 215                         } else {
 216                                 rect->x = 2;
 217                                 rect->y = font->height + 2 + 2;
 218                                 rect->width = client->rect.width - (2 + 2);
 219                                 rect->height = client->rect.height - ((font->height + 2 + 2) + 2);
 220                         }
 221                         break;
 222         }
 223
 224         /* Obey the ratio, if any */
 225         if (client->proportional_height != 0 &&
 226             client->proportional_width != 0) {
 227                 LOG("proportional height = %d, width = %d\n", client->proportional_height, client->proportional_width);
 228                 double new_height = rect->height + 1;
 229                 int new_width = rect->width;
 230
 231                 while (new_height > rect->height) {
 232                         new_height = ((double)client->proportional_height / client->proportional_width) * new_width;
 233
 234                         if (new_height > rect->height)
 235                                 new_width--;
 236                 }
 237                 /* Center the window */
 238                 rect->y += ceil(rect->height / 2) - floor(new_height / 2);
 239                 rect->x += ceil(rect->width / 2) - floor(new_width / 2);
 240
 241                 rect->height = new_height;
 242                 rect->width = new_width;
 243                 LOG("new_height = %f, new_width = %d\n", new_height, new_width);
 244         }
 245
 246         LOG("child will be at %dx%d with size %dx%d\n", rect->x, rect->y, rect->width, rect->height);
 247
 248         xcb_configure_window(conn, client->child, mask, &(rect->x));
 249
 250         /* After configuring a child window we need to fake a configure_notify_event (see ICCCM 4.2.3).
 251          * This is necessary to inform the client of its position relative to the root window,
 252          * not relative to its frame (as done in the configure_notify_event by the x server). */
 253         fake_absolute_configure_notify(conn, client);
 254 }
 255
 256 /*
 257  * Renders the given container. Is called by render_layout() or individually (for example
 258  * when focus changes in a stacking container)
 259  *
 260  */
 261 void render_container(xcb_connection_t *conn, Container *container) {
 262         Client *client;
 263         int num_clients = 0, current_client = 0;
 264
 265         if (container->currently_focused == NULL)
 266                 return;
 267
 268         CIRCLEQ_FOREACH(client, &(container->clients), clients)
 269                 num_clients++;
 270
 271         if (container->mode == MODE_DEFAULT) {
 272                 LOG("got %d clients in this default container.\n", num_clients);
 273                 CIRCLEQ_FOREACH(client, &(container->clients), clients) {
 274                         /* If the client is in fullscreen mode, it does not get reconfigured */
 275                         if (container->workspace->fullscreen_client == client) {
 276                                 current_client++;
 277                                 continue;
 278                         }
 279
 280                         /* Check if we changed client->x or client->y by updating it.
 281                          * Note the bitwise OR instead of logical OR to force evaluation of both statements */
 282                         if (client->force_reconfigure |
 283                             update_if_necessary(&(client->rect.x), container->x) |
 284                             update_if_necessary(&(client->rect.y), container->y +
 285                                         (container->height / num_clients) * current_client))
 286                                 reposition_client(conn, client);
 287
 288                         /* TODO: vertical default layout */
 289                         if (client->force_reconfigure |
 290                             update_if_necessary(&(client->rect.width), container->width) |
 291                             update_if_necessary(&(client->rect.height), container->height / num_clients))
 292                                 resize_client(conn, client);
 293
 294                         client->force_reconfigure = false;
 295
 296                         current_client++;
 297                 }
 298         } else {
 299                 i3Font *font = load_font(conn, config.font);
 300                 int decoration_height = (font->height + 2 + 2);
 301                 struct Stack_Window *stack_win = &(container->stack_win);
 302
 303                 /* Check if we need to remap our stack title window, it gets unmapped when the container
 304                    is empty in src/handlers.c:unmap_notify() */
 305                 if (stack_win->rect.height == 0)
 306                         xcb_map_window(conn, stack_win->window);
 307
 308                 /* Check if we need to reconfigure our stack title window */
 309                 if (update_if_necessary(&(stack_win->rect.x), container->x) |
 310                     update_if_necessary(&(stack_win->rect.y), container->y) |
 311                     update_if_necessary(&(stack_win->rect.width), container->width) |
 312                     update_if_necessary(&(stack_win->rect.height), decoration_height * num_clients)) {
 313
 314                         /* Configuration can happen in two slightly different ways:
 315
 316                            If there is no client in fullscreen mode, 5 parameters are passed
 317                            (x, y, width, height, stack mode is set to above which means top-most position).
 318
 319                            If there is a fullscreen client, the fourth parameter is set to to the
 320                            fullscreen window as sibling and the stack mode is set to below, which means
 321                            that the stack_window will be placed just below the sibling, that is, under
 322                            the fullscreen window.
 323                          */
 324                         uint32_t values[] = { stack_win->rect.x, stack_win->rect.y,
 325                                               stack_win->rect.width, stack_win->rect.height,
 326                                               XCB_STACK_MODE_ABOVE, XCB_STACK_MODE_BELOW };
 327                         uint32_t mask = XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y |
 328                                         XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT |
 329                                         XCB_CONFIG_WINDOW_STACK_MODE;
 330
 331                         /* Raise the stack window, but keep it below the first floating client
 332                          * and below the fullscreen client (if any) */
 333                         Client *first_floating = TAILQ_FIRST(&(container->workspace->floating_clients));
 334                         if (first_floating != TAILQ_END(&(container->workspace->floating_clients))) {
 335                                 mask |= XCB_CONFIG_WINDOW_SIBLING;
 336                                 values[4] = first_floating->frame;
 337                         } else if (container->workspace->fullscreen_client != NULL) {
 338                                 mask |= XCB_CONFIG_WINDOW_SIBLING;
 339                                 values[4] = container->workspace->fullscreen_client->frame;
 340                         }
 341
 342                         xcb_configure_window(conn, stack_win->window, mask, values);
 343                 }
 344
 345                 /* Render the decorations of all clients */
 346                 CIRCLEQ_FOREACH(client, &(container->clients), clients) {
 347                         /* If the client is in fullscreen mode, it does not get reconfigured */
 348                         if (container->workspace->fullscreen_client == client) {
 349                                 current_client++;
 350                                 continue;
 351                         }
 352
 353                         /* Check if we changed client->x or client->y by updating it.
 354                          * Note the bitwise OR instead of logical OR to force evaluation of both statements */
 355                         if (client->force_reconfigure |
 356                             update_if_necessary(&(client->rect.x), container->x) |
 357                             update_if_necessary(&(client->rect.y), container->y + (decoration_height * num_clients)))
 358                                 reposition_client(conn, client);
 359
 360                         if (client->force_reconfigure |
 361                             update_if_necessary(&(client->rect.width), container->width) |
 362                             update_if_necessary(&(client->rect.height), container->height - (decoration_height * num_clients)))
 363                                 resize_client(conn, client);
 364
 365                         client->force_reconfigure = false;
 366
 367                         decorate_window(conn, client, stack_win->window, stack_win->gc,
 368                                         current_client++ * decoration_height);
 369                 }
 370         }
 371 }
 372
 373 static void render_bars(xcb_connection_t *conn, Workspace *r_ws, int width, int *height) {
 374         Client *client;
 375         SLIST_FOREACH(client, &(r_ws->screen->dock_clients), dock_clients) {
 376                 LOG("client is at %d, should be at %d\n", client->rect.y, *height);
 377                 if (client->force_reconfigure |
 378                     update_if_necessary(&(client->rect.x), 0) |
 379                     update_if_necessary(&(client->rect.y), *height))
 380                         reposition_client(conn, client);
 381
 382                 if (client->force_reconfigure |
 383                     update_if_necessary(&(client->rect.width), width) |
 384                     update_if_necessary(&(client->rect.height), client->desired_height))
 385                         resize_client(conn, client);
 386
 387                 client->force_reconfigure = false;
 388                 LOG("desired_height = %d\n", client->desired_height);
 389                 *height += client->desired_height;
 390         }
 391 }
 392
 393 static void render_internal_bar(xcb_connection_t *conn, Workspace *r_ws, int width, int height) {
 394         LOG("Rendering internal bar\n");
 395         i3Font *font = load_font(conn, config.font);
 396         i3Screen *screen = r_ws->screen;
 397         enum { SET_NORMAL = 0, SET_FOCUSED = 1 };
 398         char label[3];
 399
 400         /* Fill the whole bar in black */
 401         xcb_change_gc_single(conn, screen->bargc, XCB_GC_FOREGROUND, get_colorpixel(conn, "#000000"));
 402         xcb_rectangle_t rect = {0, 0, width, height};
 403         xcb_poly_fill_rectangle(conn, screen->bar, screen->bargc, 1, &rect);
 404
 405         /* Set font */
 406         xcb_change_gc_single(conn, screen->bargc, XCB_GC_FONT, font->id);
 407
 408         int drawn = 0;
 409         for (int c = 0; c < 10; c++) {
 410                 if (workspaces[c].screen != screen)
 411                         continue;
 412
 413                 struct Colortriple *color = (screen->current_workspace == c ? &(config.bar.focused) :
 414                                              &(config.bar.unfocused));
 415
 416                 xcb_draw_rect(conn, screen->bar, screen->bargc, color->border,
 417                               drawn * height, 1, height - 2, height - 2);
 418                 xcb_draw_rect(conn, screen->bar, screen->bargc, color->background,
 419                               drawn * height + 1, 2, height - 4, height - 4);
 420
 421                 snprintf(label, sizeof(label), "%d", c+1);
 422                 xcb_change_gc_single(conn, screen->bargc, XCB_GC_FOREGROUND, color->text);
 423                 xcb_change_gc_single(conn, screen->bargc, XCB_GC_BACKGROUND, color->background);
 424                 xcb_image_text_8(conn, strlen(label), screen->bar, screen->bargc, drawn * height + 5 /* X */,
 425                                                 font->height + 1 /* Y = baseline of font */, label);
 426                 drawn++;
 427         }
 428
 429         LOG("done rendering internal\n");
 430 }
 431
 432 /*
 433  * Modifies the event mask of all clients on the given workspace to either ignore or to handle
 434  * enter notifies. It is handy to ignore notifies because they will be sent when a window is mapped
 435  * under the cursor, thus when the user didn’t enter the window actively at all.
 436  *
 437  */
 438 void ignore_enter_notify_forall(xcb_connection_t *conn, Workspace *workspace, bool ignore_enter_notify) {
 439         Client *client;
 440         uint32_t values[1];
 441
 442         LOG("Ignore enter_notify = %d\n", ignore_enter_notify);
 443
 444         FOR_TABLE(workspace)
 445                 CIRCLEQ_FOREACH(client, &(workspace->table[cols][rows]->clients), clients) {
 446                         /* Change event mask for the decorations */
 447                         values[0] = FRAME_EVENT_MASK;
 448                         if (ignore_enter_notify)
 449                                 values[0] &= ~(XCB_EVENT_MASK_ENTER_WINDOW);
 450                         xcb_change_window_attributes(conn, client->frame, XCB_CW_EVENT_MASK, values);
 451
 452                         /* Change event mask for the child itself */
 453                         values[0] = CHILD_EVENT_MASK;
 454                         if (ignore_enter_notify)
 455                                 values[0] &= ~(XCB_EVENT_MASK_ENTER_WINDOW);
 456                         xcb_change_window_attributes(conn, client->child, XCB_CW_EVENT_MASK, values);
 457                 }
 458 }
 459
 460 /*
 461  * Renders the given workspace on the given screen
 462  *
 463  */
 464 void render_workspace(xcb_connection_t *conn, i3Screen *screen, Workspace *r_ws) {
 465         i3Font *font = load_font(conn, config.font);
 466         int width = r_ws->rect.width;
 467         int height = r_ws->rect.height;
 468
 469         /* Reserve space for dock clients */
 470         Client *client;
 471         SLIST_FOREACH(client, &(screen->dock_clients), dock_clients)
 472                 height -= client->desired_height;
 473
 474         /* Space for the internal bar */
 475         height -= (font->height + 6);
 476
 477         LOG("got %d rows and %d cols\n", r_ws->rows, r_ws->cols);
 478
 479         int xoffset[r_ws->rows];
 480         int yoffset[r_ws->cols];
 481         /* Initialize offsets */
 482         for (int cols = 0; cols < r_ws->cols; cols++)
 483                 yoffset[cols] = r_ws->rect.y;
 484         for (int rows = 0; rows < r_ws->rows; rows++)
 485                 xoffset[rows] = r_ws->rect.x;
 486
 487         dump_table(conn, r_ws);
 488
 489         ignore_enter_notify_forall(conn, r_ws, true);
 490
 491         /* Go through the whole table and render what’s necessary */
 492         FOR_TABLE(r_ws) {
 493                 Container *container = r_ws->table[cols][rows];
 494                 int single_width = -1, single_height;
 495                 LOG("\n");
 496                 LOG("========\n");
 497                 LOG("container has %d colspan, %d rowspan\n",
 498                                 container->colspan, container->rowspan);
 499                 LOG("container at %d, %d\n", xoffset[rows], yoffset[cols]);
 500                 /* Update position of the container */
 501                 container->row = rows;
 502                 container->col = cols;
 503                 container->x = xoffset[rows];
 504                 container->y = yoffset[cols];
 505                 container->width = 0;
 506
 507                 for (int c = 0; c < container->colspan; c++) {
 508                         if (r_ws->width_factor[cols+c] == 0)
 509                                 container->width += (width / r_ws->cols);
 510                         else container->width += get_unoccupied_x(r_ws) * r_ws->width_factor[cols+c];
 511
 512                         if (single_width == -1)
 513                                 single_width = container->width;
 514                 }
 515
 516                 //if (container->height_factor == 0)
 517                         container->height = (height / r_ws->rows);
 518                 //else container->height = get_unoccupied_y(r_ws, cols) * container->height_factor;
 519                 single_height = container->height;
 520                 container->height *= container->rowspan;
 521
 522                 /* Render the container if it is not empty */
 523                 render_container(conn, container);
 524
 525                 xoffset[rows] += single_width;
 526                 yoffset[cols] += single_height;
 527                 LOG("==========\n");
 528         }
 529
 530         ignore_enter_notify_forall(conn, r_ws, false);
 531
 532         render_bars(conn, r_ws, width, &height);
 533         render_internal_bar(conn, r_ws, width, font->height + 6);
 534 }
 535
 536 /*
 537  * Renders the whole layout, that is: Go through each screen, each workspace, each container
 538  * and render each client. This also renders the bars.
 539  *
 540  * If you don’t need to render *everything*, you should call render_container on the container
 541  * you want to refresh.
 542  *
 543  */
 544 void render_layout(xcb_connection_t *conn) {
 545         i3Screen *screen;
 546
 547         TAILQ_FOREACH(screen, virtual_screens, screens) {
 548                 LOG("Rendering screen %d\n", screen->num);
 549                 render_workspace(conn, screen, &(workspaces[screen->current_workspace]));
 550         }
 551
 552         xcb_flush(conn);
 553 }