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

   1 #undef I3__FILE__
   2 #define I3__FILE__ "render.c"
   3 /*
   4  * vim:ts=4:sw=4:expandtab
   5  *
   6  * i3 - an improved dynamic tiling window manager
   7  * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
   8  *
   9  * render.c: Renders (determines position/sizes) the layout tree, updating the
  10  *           various rects. Needs to be pushed to X11 (see x.c) to be visible.
  11  *
  12  */
  13 #include "all.h"
  14
  15 /* change this to 'true' if you want to have additional borders around every
  16  * container (for debugging purposes) */
  17 static bool show_debug_borders = false;
  18
  19 /*
  20  * Returns the height for the decorations
  21  */
  22 int render_deco_height(void) {
  23     int deco_height = config.font.height + 4;
  24     if (config.font.height & 0x01)
  25         ++deco_height;
  26     return deco_height;
  27 }
  28
  29 /*
  30  * Renders a container with layout L_OUTPUT. In this layout, all CT_DOCKAREAs
  31  * get the height of their content and the remaining CT_CON gets the rest.
  32  *
  33  */
  34 static void render_l_output(Con *con) {
  35     Con *child, *dockchild;
  36
  37     int x = con->rect.x;
  38     int y = con->rect.y;
  39     int height = con->rect.height;
  40
  41     /* Find the content container and ensure that there is exactly one. Also
  42      * check for any non-CT_DOCKAREA clients. */
  43     Con *content = NULL;
  44     TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
  45         if (child->type == CT_CON) {
  46             if (content != NULL) {
  47                 DLOG("More than one CT_CON on output container\n");
  48                 assert(false);
  49             }
  50             content = child;
  51         } else if (child->type != CT_DOCKAREA) {
  52             DLOG("Child %p of type %d is inside the OUTPUT con\n", child, child->type);
  53             assert(false);
  54         }
  55     }
  56
  57     if (content == NULL) {
  58         DLOG("Skipping this output because it is currently being destroyed.\n");
  59         return;
  60     }
  61
  62     /* We need to find out if there is a fullscreen con on the current workspace
  63      * and take the short-cut to render it directly (the user does not want to
  64      * see the dockareas in that case) */
  65     Con *ws = con_get_fullscreen_con(content, CF_OUTPUT);
  66     if (!ws) {
  67         DLOG("Skipping this output because it is currently being destroyed.\n");
  68         return;
  69     }
  70     Con *fullscreen = con_get_fullscreen_con(ws, CF_OUTPUT);
  71     if (fullscreen) {
  72         fullscreen->rect = con->rect;
  73         x_raise_con(fullscreen);
  74         render_con(fullscreen, true);
  75         return;
  76     }
  77
  78     /* First pass: determine the height of all CT_DOCKAREAs (the sum of their
  79      * children) and figure out how many pixels we have left for the rest */
  80     TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
  81         if (child->type != CT_DOCKAREA)
  82             continue;
  83
  84         child->rect.height = 0;
  85         TAILQ_FOREACH(dockchild, &(child->nodes_head), nodes)
  86         child->rect.height += dockchild->geometry.height;
  87
  88         height -= child->rect.height;
  89     }
  90
  91     /* Second pass: Set the widths/heights */
  92     TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
  93         if (child->type == CT_CON) {
  94             child->rect.x = x;
  95             child->rect.y = y;
  96             child->rect.width = con->rect.width;
  97             child->rect.height = height;
  98         }
  99
 100         child->rect.x = x;
 101         child->rect.y = y;
 102         child->rect.width = con->rect.width;
 103
 104         child->deco_rect.x = 0;
 105         child->deco_rect.y = 0;
 106         child->deco_rect.width = 0;
 107         child->deco_rect.height = 0;
 108
 109         y += child->rect.height;
 110
 111         DLOG("child at (%d, %d) with (%d x %d)\n",
 112              child->rect.x, child->rect.y, child->rect.width, child->rect.height);
 113         x_raise_con(child);
 114         render_con(child, false);
 115     }
 116 }
 117
 118 /*
 119  * "Renders" the given container (and its children), meaning that all rects are
 120  * updated correctly. Note that this function does not call any xcb_*
 121  * functions, so the changes are completely done in memory only (and
 122  * side-effect free). As soon as you call x_push_changes(), the changes will be
 123  * updated in X11.
 124  *
 125  */
 126 void render_con(Con *con, bool render_fullscreen) {
 127     int children = con_num_children(con);
 128     DLOG("Rendering %snode %p / %s / layout %d / children %d\n",
 129          (render_fullscreen ? "fullscreen " : ""), con, con->name, con->layout,
 130          children);
 131
 132     /* Copy container rect, subtract container border */
 133     /* This is the actually usable space inside this container for clients */
 134     Rect rect = con->rect;
 135
 136     /* Display a border if this is a leaf node. For container nodes, we don’t
 137      * draw borders (except when in debug mode) */
 138     if (show_debug_borders) {
 139         rect.x += 2;
 140         rect.y += 2;
 141         rect.width -= 2 * 2;
 142         rect.height -= 2 * 2;
 143     }
 144
 145     int x = rect.x;
 146     int y = rect.y;
 147
 148     int i = 0;
 149
 150     con->mapped = true;
 151
 152     /* if this container contains a window, set the coordinates */
 153     if (con->window) {
 154         /* depending on the border style, the rect of the child window
 155          * needs to be smaller */
 156         Rect *inset = &(con->window_rect);
 157         *inset = (Rect) {0, 0, con->rect.width, con->rect.height};
 158         if (!render_fullscreen)
 159             *inset = rect_add(*inset, con_border_style_rect(con));
 160
 161         /* Obey x11 border */
 162         inset->width -= (2 * con->border_width);
 163         inset->height -= (2 * con->border_width);
 164
 165         /* Obey the aspect ratio, if any, unless we are in fullscreen mode.
 166          *
 167          * The spec isn’t explicit on whether the aspect ratio hints should be
 168          * respected during fullscreen mode. Other WMs such as Openbox don’t do
 169          * that, and this post suggests that this is the correct way to do it:
 170          * http://mail.gnome.org/archives/wm-spec-list/2003-May/msg00007.html
 171          *
 172          * Ignoring aspect ratio during fullscreen was necessary to fix MPlayer
 173          * subtitle rendering, see http://bugs.i3wm.org/594 */
 174         if (!render_fullscreen &&
 175             con->aspect_ratio > 0.0) {
 176             DLOG("aspect_ratio = %f, current width/height are %d/%d\n",
 177                  con->aspect_ratio, inset->width, inset->height);
 178             double new_height = inset->height + 1;
 179             int new_width = inset->width;
 180
 181             while (new_height > inset->height) {
 182                 new_height = (1.0 / con->aspect_ratio) * new_width;
 183
 184                 if (new_height > inset->height)
 185                     new_width--;
 186             }
 187             /* Center the window */
 188             inset->y += ceil(inset->height / 2) - floor((new_height + .5) / 2);
 189             inset->x += ceil(inset->width / 2) - floor(new_width / 2);
 190
 191             inset->height = new_height + .5;
 192             inset->width = new_width;
 193         }
 194
 195         /* NB: We used to respect resize increment size hints for tiling
 196          * windows up until commit 0db93d9 here. However, since all terminal
 197          * emulators cope with ignoring the size hints in a better way than we
 198          * can (by providing their fake-transparency or background color), this
 199          * code was removed. See also http://bugs.i3wm.org/540 */
 200
 201         DLOG("child will be at %dx%d with size %dx%d\n", inset->x, inset->y, inset->width, inset->height);
 202     }
 203
 204     /* Check for fullscreen nodes */
 205     Con *fullscreen = NULL;
 206     if (con->type != CT_OUTPUT) {
 207         fullscreen = con_get_fullscreen_con(con, (con->type == CT_ROOT ? CF_GLOBAL : CF_OUTPUT));
 208     }
 209     if (fullscreen) {
 210         fullscreen->rect = rect;
 211         x_raise_con(fullscreen);
 212         render_con(fullscreen, true);
 213         return;
 214     }
 215
 216     /* find the height for the decorations */
 217     int deco_height = render_deco_height();
 218
 219     /* precalculate the sizes to be able to correct rounding errors */
 220     int sizes[children];
 221     memset(sizes, 0, children * sizeof(int));
 222     if ((con->layout == L_SPLITH || con->layout == L_SPLITV) && children > 0) {
 223         assert(!TAILQ_EMPTY(&con->nodes_head));
 224         Con *child;
 225         int i = 0, assigned = 0;
 226         int total = con_orientation(con) == HORIZ ? rect.width : rect.height;
 227         TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
 228             double percentage = child->percent > 0.0 ? child->percent : 1.0 / children;
 229             assigned += sizes[i++] = percentage * total;
 230         }
 231         assert(assigned == total ||
 232                (assigned > total && assigned - total <= children * 2) ||
 233                (assigned < total && total - assigned <= children * 2));
 234         int signal = assigned < total ? 1 : -1;
 235         while (assigned != total) {
 236             for (i = 0; i < children && assigned != total; ++i) {
 237                 sizes[i] += signal;
 238                 assigned += signal;
 239             }
 240         }
 241     }
 242
 243     if (con->layout == L_OUTPUT) {
 244         /* Skip i3-internal outputs */
 245         if (con_is_internal(con))
 246             return;
 247         render_l_output(con);
 248     } else if (con->type == CT_ROOT) {
 249         Con *output;
 250         TAILQ_FOREACH(output, &(con->nodes_head), nodes) {
 251             render_con(output, false);
 252         }
 253
 254         /* We need to render floating windows after rendering all outputs’
 255          * tiling windows because they need to be on top of *every* output at
 256          * all times. This is important when the user places floating
 257          * windows/containers so that they overlap on another output. */
 258         DLOG("Rendering floating windows:\n");
 259         TAILQ_FOREACH(output, &(con->nodes_head), nodes) {
 260             if (con_is_internal(output))
 261                 continue;
 262             /* Get the active workspace of that output */
 263             Con *content = output_get_content(output);
 264             if (!content || TAILQ_EMPTY(&(content->focus_head))) {
 265                 DLOG("Skipping this output because it is currently being destroyed.\n");
 266                 continue;
 267             }
 268             Con *workspace = TAILQ_FIRST(&(content->focus_head));
 269             Con *fullscreen = con_get_fullscreen_con(workspace, CF_OUTPUT);
 270             Con *child;
 271             TAILQ_FOREACH(child, &(workspace->floating_head), floating_windows) {
 272                 /* Don’t render floating windows when there is a fullscreen window
 273                  * on that workspace. Necessary to make floating fullscreen work
 274                  * correctly (ticket #564). */
 275                 /* If there is no fullscreen->window, this cannot be a
 276                  * transient window, so we _know_ we need to skip it. This
 277                  * happens during restarts where the container already exists,
 278                  * but the window was not yet associated. */
 279                 if (fullscreen != NULL && fullscreen->window == NULL)
 280                     continue;
 281                 if (fullscreen != NULL && fullscreen->window != NULL) {
 282                     Con *floating_child = con_descend_focused(child);
 283                     Con *transient_con = floating_child;
 284                     bool is_transient_for = false;
 285                     /* Exception to the above rule: smart
 286                      * popup_during_fullscreen handling (popups belonging to
 287                      * the fullscreen app will be rendered). */
 288                     while (transient_con != NULL &&
 289                            transient_con->window != NULL &&
 290                            transient_con->window->transient_for != XCB_NONE) {
 291                         if (transient_con->window->transient_for == fullscreen->window->id) {
 292                             is_transient_for = true;
 293                             break;
 294                         }
 295                         Con *next_transient = con_by_window_id(transient_con->window->transient_for);
 296                         if (next_transient == NULL)
 297                             break;
 298                         /* Some clients (e.g. x11-ssh-askpass) actually set
 299                          * WM_TRANSIENT_FOR to their own window id, so break instead of
 300                          * looping endlessly. */
 301                         if (transient_con == next_transient)
 302                             break;
 303                         transient_con = next_transient;
 304                     }
 305
 306                     if (!is_transient_for)
 307                         continue;
 308                     else {
 309                         DLOG("Rendering floating child even though in fullscreen mode: "
 310                              "floating->transient_for (0x%08x) --> fullscreen->id (0x%08x)\n",
 311                              floating_child->window->transient_for, fullscreen->window->id);
 312                     }
 313                 }
 314                 DLOG("floating child at (%d,%d) with %d x %d\n",
 315                      child->rect.x, child->rect.y, child->rect.width, child->rect.height);
 316                 x_raise_con(child);
 317                 render_con(child, false);
 318             }
 319         }
 320
 321     } else {
 322         /* FIXME: refactor this into separate functions: */
 323         Con *child;
 324         TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
 325             assert(children > 0);
 326
 327             /* default layout */
 328             if (con->layout == L_SPLITH || con->layout == L_SPLITV) {
 329                 if (con->layout == L_SPLITH) {
 330                     child->rect.x = x;
 331                     child->rect.y = y;
 332                     child->rect.width = sizes[i];
 333                     child->rect.height = rect.height;
 334                     x += child->rect.width;
 335                 } else {
 336                     child->rect.x = x;
 337                     child->rect.y = y;
 338                     child->rect.width = rect.width;
 339                     child->rect.height = sizes[i];
 340                     y += child->rect.height;
 341                 }
 342
 343                 /* first we have the decoration, if this is a leaf node */
 344                 if (con_is_leaf(child)) {
 345                     if (child->border_style == BS_NORMAL) {
 346                         /* TODO: make a function for relative coords? */
 347                         child->deco_rect.x = child->rect.x - con->rect.x;
 348                         child->deco_rect.y = child->rect.y - con->rect.y;
 349
 350                         child->rect.y += deco_height;
 351                         child->rect.height -= deco_height;
 352
 353                         child->deco_rect.width = child->rect.width;
 354                         child->deco_rect.height = deco_height;
 355                     } else {
 356                         child->deco_rect.x = 0;
 357                         child->deco_rect.y = 0;
 358                         child->deco_rect.width = 0;
 359                         child->deco_rect.height = 0;
 360                     }
 361                 }
 362             }
 363
 364             /* stacked layout */
 365             else if (con->layout == L_STACKED) {
 366                 child->rect.x = x;
 367                 child->rect.y = y;
 368                 child->rect.width = rect.width;
 369                 child->rect.height = rect.height;
 370
 371                 child->deco_rect.x = x - con->rect.x;
 372                 child->deco_rect.y = y - con->rect.y + (i * deco_height);
 373                 child->deco_rect.width = child->rect.width;
 374                 child->deco_rect.height = deco_height;
 375
 376                 if (children > 1 || (child->border_style != BS_PIXEL && child->border_style != BS_NONE)) {
 377                     child->rect.y += (deco_height * children);
 378                     child->rect.height -= (deco_height * children);
 379                 }
 380             }
 381
 382             /* tabbed layout */
 383             else if (con->layout == L_TABBED) {
 384                 child->rect.x = x;
 385                 child->rect.y = y;
 386                 child->rect.width = rect.width;
 387                 child->rect.height = rect.height;
 388
 389                 child->deco_rect.width = floor((float)child->rect.width / children);
 390                 child->deco_rect.x = x - con->rect.x + i * child->deco_rect.width;
 391                 child->deco_rect.y = y - con->rect.y;
 392
 393                 /* Since the tab width may be something like 31,6 px per tab, we
 394              * let the last tab have all the extra space (0,6 * children). */
 395                 if (i == (children - 1)) {
 396                     child->deco_rect.width += (child->rect.width - (child->deco_rect.x + child->deco_rect.width));
 397                 }
 398
 399                 if (children > 1 || (child->border_style != BS_PIXEL && child->border_style != BS_NONE)) {
 400                     child->rect.y += deco_height;
 401                     child->rect.height -= deco_height;
 402                     child->deco_rect.height = deco_height;
 403                 } else {
 404                     child->deco_rect.height = (child->border_style == BS_PIXEL ? 1 : 0);
 405                 }
 406             }
 407
 408             /* dockarea layout */
 409             else if (con->layout == L_DOCKAREA) {
 410                 child->rect.x = x;
 411                 child->rect.y = y;
 412                 child->rect.width = rect.width;
 413                 child->rect.height = child->geometry.height;
 414
 415                 child->deco_rect.x = 0;
 416                 child->deco_rect.y = 0;
 417                 child->deco_rect.width = 0;
 418                 child->deco_rect.height = 0;
 419                 y += child->rect.height;
 420             }
 421
 422             DLOG("child at (%d, %d) with (%d x %d)\n",
 423                  child->rect.x, child->rect.y, child->rect.width, child->rect.height);
 424             x_raise_con(child);
 425             render_con(child, false);
 426             i++;
 427         }
 428
 429         /* in a stacking or tabbed container, we ensure the focused client is raised */
 430         if (con->layout == L_STACKED || con->layout == L_TABBED) {
 431             TAILQ_FOREACH_REVERSE(child, &(con->focus_head), focus_head, focused)
 432             x_raise_con(child);
 433             if ((child = TAILQ_FIRST(&(con->focus_head)))) {
 434                 /* By rendering the stacked container again, we handle the case
 435              * that we have a non-leaf-container inside the stack. In that
 436              * case, the children of the non-leaf-container need to be raised
 437              * aswell. */
 438                 render_con(child, false);
 439             }
 440
 441             if (children != 1)
 442                 /* Raise the stack con itself. This will put the stack decoration on
 443              * top of every stack window. That way, when a new window is opened in
 444              * the stack, the old window will not obscure part of the decoration
 445              * (it’s unmapped afterwards). */
 446                 x_raise_con(con);
 447         }
 448     }
 449 }