i3
render.c
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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 (fullscreen != NULL && fullscreen->window != NULL) {
276  Con *floating_child = con_descend_focused(child);
277  Con *transient_con = floating_child;
278  bool is_transient_for = false;
279  /* Exception to the above rule: smart
280  * popup_during_fullscreen handling (popups belonging to
281  * the fullscreen app will be rendered). */
282  while (transient_con != NULL &&
283  transient_con->window != NULL &&
284  transient_con->window->transient_for != XCB_NONE) {
285  if (transient_con->window->transient_for == fullscreen->window->id) {
286  is_transient_for = true;
287  break;
288  }
289  transient_con = con_by_window_id(transient_con->window->transient_for);
290  }
291 
292  if (!is_transient_for)
293  continue;
294  else {
295  DLOG("Rendering floating child even though in fullscreen mode: "
296  "floating->transient_for (0x%08x) --> fullscreen->id (0x%08x)\n",
297  floating_child->window->transient_for, fullscreen->window->id);
298  }
299  }
300  DLOG("floating child at (%d,%d) with %d x %d\n",
301  child->rect.x, child->rect.y, child->rect.width, child->rect.height);
302  x_raise_con(child);
303  render_con(child, false);
304  }
305  }
306 
307  } else {
308 
309  /* FIXME: refactor this into separate functions: */
310  Con *child;
311  TAILQ_FOREACH(child, &(con->nodes_head), nodes) {
312  assert(children > 0);
313 
314  /* default layout */
315  if (con->layout == L_SPLITH || con->layout == L_SPLITV) {
316  if (con->layout == L_SPLITH) {
317  child->rect.x = x;
318  child->rect.y = y;
319  child->rect.width = sizes[i];
320  child->rect.height = rect.height;
321  x += child->rect.width;
322  } else {
323  child->rect.x = x;
324  child->rect.y = y;
325  child->rect.width = rect.width;
326  child->rect.height = sizes[i];
327  y += child->rect.height;
328  }
329 
330  /* first we have the decoration, if this is a leaf node */
331  if (con_is_leaf(child)) {
332  if (child->border_style == BS_NORMAL) {
333  /* TODO: make a function for relative coords? */
334  child->deco_rect.x = child->rect.x - con->rect.x;
335  child->deco_rect.y = child->rect.y - con->rect.y;
336 
337  child->rect.y += deco_height;
338  child->rect.height -= deco_height;
339 
340  child->deco_rect.width = child->rect.width;
341  child->deco_rect.height = deco_height;
342  } else {
343  child->deco_rect.x = 0;
344  child->deco_rect.y = 0;
345  child->deco_rect.width = 0;
346  child->deco_rect.height = 0;
347  }
348  }
349  }
350 
351  /* stacked layout */
352  else if (con->layout == L_STACKED) {
353  child->rect.x = x;
354  child->rect.y = y;
355  child->rect.width = rect.width;
356  child->rect.height = rect.height;
357 
358  child->deco_rect.x = x - con->rect.x;
359  child->deco_rect.y = y - con->rect.y + (i * deco_height);
360  child->deco_rect.width = child->rect.width;
361  child->deco_rect.height = deco_height;
362 
363  if (children > 1 || (child->border_style != BS_PIXEL && child->border_style != BS_NONE)) {
364  child->rect.y += (deco_height * children);
365  child->rect.height -= (deco_height * children);
366  }
367  }
368 
369  /* tabbed layout */
370  else if (con->layout == L_TABBED) {
371  child->rect.x = x;
372  child->rect.y = y;
373  child->rect.width = rect.width;
374  child->rect.height = rect.height;
375 
376  child->deco_rect.width = floor((float)child->rect.width / children);
377  child->deco_rect.x = x - con->rect.x + i * child->deco_rect.width;
378  child->deco_rect.y = y - con->rect.y;
379 
380  /* Since the tab width may be something like 31,6 px per tab, we
381  * let the last tab have all the extra space (0,6 * children). */
382  if (i == (children-1)) {
383  child->deco_rect.width += (child->rect.width - (child->deco_rect.x + child->deco_rect.width));
384  }
385 
386  if (children > 1 || (child->border_style != BS_PIXEL && child->border_style != BS_NONE)) {
387  child->rect.y += deco_height;
388  child->rect.height -= deco_height;
389  child->deco_rect.height = deco_height;
390  } else {
391  child->deco_rect.height = (child->border_style == BS_PIXEL ? 1 : 0);
392  }
393  }
394 
395  /* dockarea layout */
396  else if (con->layout == L_DOCKAREA) {
397  child->rect.x = x;
398  child->rect.y = y;
399  child->rect.width = rect.width;
400  child->rect.height = child->geometry.height;
401 
402  child->deco_rect.x = 0;
403  child->deco_rect.y = 0;
404  child->deco_rect.width = 0;
405  child->deco_rect.height = 0;
406  y += child->rect.height;
407  }
408 
409  DLOG("child at (%d, %d) with (%d x %d)\n",
410  child->rect.x, child->rect.y, child->rect.width, child->rect.height);
411  x_raise_con(child);
412  render_con(child, false);
413  i++;
414  }
415 
416  /* in a stacking or tabbed container, we ensure the focused client is raised */
417  if (con->layout == L_STACKED || con->layout == L_TABBED) {
418  TAILQ_FOREACH_REVERSE(child, &(con->focus_head), focus_head, focused)
419  x_raise_con(child);
420  if ((child = TAILQ_FIRST(&(con->focus_head)))) {
421  /* By rendering the stacked container again, we handle the case
422  * that we have a non-leaf-container inside the stack. In that
423  * case, the children of the non-leaf-container need to be raised
424  * aswell. */
425  render_con(child, false);
426  }
427 
428  if (children != 1)
429  /* Raise the stack con itself. This will put the stack decoration on
430  * top of every stack window. That way, when a new window is opened in
431  * the stack, the old window will not obscure part of the decoration
432  * (it’s unmapped afterwards). */
433  x_raise_con(con);
434  }
435  }
436 }