i3
src/x.c
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00001 /*
00002  * vim:ts=4:sw=4:expandtab
00003  *
00004  * i3 - an improved dynamic tiling window manager
00005  * © 2009-2012 Michael Stapelberg and contributors (see also: LICENSE)
00006  *
00007  * x.c: Interface to X11, transfers our in-memory state to X11 (see also
00008  *      render.c). Basically a big state machine.
00009  *
00010  */
00011 #include "all.h"
00012 
00013 /* Stores the X11 window ID of the currently focused window */
00014 xcb_window_t focused_id = XCB_NONE;
00015 
00016 /* The bottom-to-top window stack of all windows which are managed by i3.
00017  * Used for x_get_window_stack(). */
00018 static xcb_window_t *btt_stack;
00019 static int btt_stack_num;
00020 
00021 /* Stores coordinates to warp mouse pointer to if set */
00022 static Rect *warp_to;
00023 
00024 /*
00025  * Describes the X11 state we may modify (map state, position, window stack).
00026  * There is one entry per container. The state represents the current situation
00027  * as X11 sees it (with the exception of the order in the state_head CIRCLEQ,
00028  * which represents the order that will be pushed to X11, while old_state_head
00029  * represents the current order). It will be updated in x_push_changes().
00030  *
00031  */
00032 typedef struct con_state {
00033     xcb_window_t id;
00034     bool mapped;
00035     bool unmap_now;
00036     bool child_mapped;
00037 
00039     Con *con;
00040 
00041     /* For reparenting, we have a flag (need_reparent) and the X ID of the old
00042      * frame this window was in. The latter is necessary because we need to
00043      * ignore UnmapNotify events (by changing the window event mask). */
00044     bool need_reparent;
00045     xcb_window_t old_frame;
00046 
00047     Rect rect;
00048     Rect window_rect;
00049 
00050     bool initial;
00051 
00052     char *name;
00053 
00054     CIRCLEQ_ENTRY(con_state) state;
00055     CIRCLEQ_ENTRY(con_state) old_state;
00056 } con_state;
00057 
00058 CIRCLEQ_HEAD(state_head, con_state) state_head =
00059     CIRCLEQ_HEAD_INITIALIZER(state_head);
00060 
00061 CIRCLEQ_HEAD(old_state_head, con_state) old_state_head =
00062     CIRCLEQ_HEAD_INITIALIZER(old_state_head);
00063 
00064 /*
00065  * Returns the container state for the given frame. This function always
00066  * returns a container state (otherwise, there is a bug in the code and the
00067  * container state of a container for which x_con_init() was not called was
00068  * requested).
00069  *
00070  */
00071 static con_state *state_for_frame(xcb_window_t window) {
00072     con_state *state;
00073     CIRCLEQ_FOREACH(state, &state_head, state)
00074         if (state->id == window)
00075             return state;
00076 
00077     /* TODO: better error handling? */
00078     ELOG("No state found\n");
00079     assert(false);
00080     return NULL;
00081 }
00082 
00083 /*
00084  * Initializes the X11 part for the given container. Called exactly once for
00085  * every container from con_new().
00086  *
00087  */
00088 void x_con_init(Con *con, uint16_t depth) {
00089     /* TODO: maybe create the window when rendering first? we could then even
00090      * get the initial geometry right */
00091 
00092     uint32_t mask = 0;
00093     uint32_t values[5];
00094 
00095     xcb_visualid_t visual = XCB_COPY_FROM_PARENT;
00096     xcb_colormap_t win_colormap = XCB_NONE;
00097     if (depth != root_depth && depth != XCB_COPY_FROM_PARENT) {
00098         /* For custom visuals, we need to create a colormap before creating
00099          * this window. It will be freed directly after creating the window. */
00100         visual = get_visualid_by_depth(depth);
00101         win_colormap = xcb_generate_id(conn);
00102         xcb_create_colormap_checked(conn, XCB_COLORMAP_ALLOC_NONE, win_colormap, root, visual);
00103 
00104         /* We explicitly set a background color and border color (even though we
00105          * don’t even have a border) because the X11 server requires us to when
00106          * using 32 bit color depths, see
00107          * http://stackoverflow.com/questions/3645632 */
00108         mask |= XCB_CW_BACK_PIXEL;
00109         values[0] = root_screen->black_pixel;
00110 
00111         mask |= XCB_CW_BORDER_PIXEL;
00112         values[1] = root_screen->black_pixel;
00113 
00114         /* our own frames should not be managed */
00115         mask |= XCB_CW_OVERRIDE_REDIRECT;
00116         values[2] = 1;
00117 
00118         /* see include/xcb.h for the FRAME_EVENT_MASK */
00119         mask |= XCB_CW_EVENT_MASK;
00120         values[3] = FRAME_EVENT_MASK & ~XCB_EVENT_MASK_ENTER_WINDOW;
00121 
00122         mask |= XCB_CW_COLORMAP;
00123         values[4] = win_colormap;
00124     } else {
00125         /* our own frames should not be managed */
00126         mask = XCB_CW_OVERRIDE_REDIRECT;
00127         values[0] = 1;
00128 
00129         /* see include/xcb.h for the FRAME_EVENT_MASK */
00130         mask |= XCB_CW_EVENT_MASK;
00131         values[1] = FRAME_EVENT_MASK & ~XCB_EVENT_MASK_ENTER_WINDOW;
00132 
00133         mask |= XCB_CW_COLORMAP;
00134         values[2] = colormap;
00135     }
00136 
00137     Rect dims = { -15, -15, 10, 10 };
00138     con->frame = create_window(conn, dims, depth, visual, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCURSOR_CURSOR_POINTER, false, mask, values);
00139 
00140     if (win_colormap != XCB_NONE)
00141         xcb_free_colormap(conn, win_colormap);
00142 
00143     struct con_state *state = scalloc(sizeof(struct con_state));
00144     state->id = con->frame;
00145     state->mapped = false;
00146     state->initial = true;
00147     CIRCLEQ_INSERT_HEAD(&state_head, state, state);
00148     CIRCLEQ_INSERT_HEAD(&old_state_head, state, old_state);
00149     DLOG("adding new state for window id 0x%08x\n", state->id);
00150 }
00151 
00152 /*
00153  * Re-initializes the associated X window state for this container. You have
00154  * to call this when you assign a client to an empty container to ensure that
00155  * its state gets updated correctly.
00156  *
00157  */
00158 void x_reinit(Con *con) {
00159     struct con_state *state;
00160 
00161     if ((state = state_for_frame(con->frame)) == NULL) {
00162         ELOG("window state not found\n");
00163         return;
00164     }
00165 
00166     DLOG("resetting state %p to initial\n", state);
00167     state->initial = true;
00168     state->child_mapped = false;
00169     state->con = con;
00170     memset(&(state->window_rect), 0, sizeof(Rect));
00171 }
00172 
00173 /*
00174  * Reparents the child window of the given container (necessary for sticky
00175  * containers). The reparenting happens in the next call of x_push_changes().
00176  *
00177  */
00178 void x_reparent_child(Con *con, Con *old) {
00179     struct con_state *state;
00180     if ((state = state_for_frame(con->frame)) == NULL) {
00181         ELOG("window state for con not found\n");
00182         return;
00183     }
00184 
00185     state->need_reparent = true;
00186     state->old_frame = old->frame;
00187 }
00188 
00189 /*
00190  * Moves a child window from Container src to Container dest.
00191  *
00192  */
00193 void x_move_win(Con *src, Con *dest) {
00194     struct con_state *state_src, *state_dest;
00195 
00196     if ((state_src = state_for_frame(src->frame)) == NULL) {
00197         ELOG("window state for src not found\n");
00198         return;
00199     }
00200 
00201     if ((state_dest = state_for_frame(dest->frame)) == NULL) {
00202         ELOG("window state for dest not found\n");
00203         return;
00204     }
00205 
00206     state_dest->con = state_src->con;
00207     state_src->con = NULL;
00208 
00209     Rect zero = { 0, 0, 0, 0 };
00210     if (memcmp(&(state_dest->window_rect), &(zero), sizeof(Rect)) == 0) {
00211         memcpy(&(state_dest->window_rect), &(state_src->window_rect), sizeof(Rect));
00212         DLOG("COPYING RECT\n");
00213     }
00214 }
00215 
00216 /*
00217  * Kills the window decoration associated with the given container.
00218  *
00219  */
00220 void x_con_kill(Con *con) {
00221     con_state *state;
00222 
00223     xcb_destroy_window(conn, con->frame);
00224     xcb_free_pixmap(conn, con->pixmap);
00225     xcb_free_gc(conn, con->pm_gc);
00226     state = state_for_frame(con->frame);
00227     CIRCLEQ_REMOVE(&state_head, state, state);
00228     CIRCLEQ_REMOVE(&old_state_head, state, old_state);
00229     FREE(state->name);
00230     free(state);
00231 
00232     /* Invalidate focused_id to correctly focus new windows with the same ID */
00233     focused_id = XCB_NONE;
00234 }
00235 
00236 /*
00237  * Returns true if the client supports the given protocol atom (like WM_DELETE_WINDOW)
00238  *
00239  */
00240 bool window_supports_protocol(xcb_window_t window, xcb_atom_t atom) {
00241     xcb_get_property_cookie_t cookie;
00242     xcb_icccm_get_wm_protocols_reply_t protocols;
00243     bool result = false;
00244 
00245     cookie = xcb_icccm_get_wm_protocols(conn, window, A_WM_PROTOCOLS);
00246     if (xcb_icccm_get_wm_protocols_reply(conn, cookie, &protocols, NULL) != 1)
00247         return false;
00248 
00249     /* Check if the client’s protocols have the requested atom set */
00250     for (uint32_t i = 0; i < protocols.atoms_len; i++)
00251         if (protocols.atoms[i] == atom)
00252             result = true;
00253 
00254     xcb_icccm_get_wm_protocols_reply_wipe(&protocols);
00255 
00256     return result;
00257 }
00258 
00259 /*
00260  * Kills the given X11 window using WM_DELETE_WINDOW (if supported).
00261  *
00262  */
00263 void x_window_kill(xcb_window_t window, kill_window_t kill_window) {
00264     /* if this window does not support WM_DELETE_WINDOW, we kill it the hard way */
00265     if (!window_supports_protocol(window, A_WM_DELETE_WINDOW)) {
00266         if (kill_window == KILL_WINDOW) {
00267             LOG("Killing specific window 0x%08x\n", window);
00268             xcb_destroy_window(conn, window);
00269         } else {
00270             LOG("Killing the X11 client which owns window 0x%08x\n", window);
00271             xcb_kill_client(conn, window);
00272         }
00273         return;
00274     }
00275 
00276     /* Every X11 event is 32 bytes long. Therefore, XCB will copy 32 bytes.
00277      * In order to properly initialize these bytes, we allocate 32 bytes even
00278      * though we only need less for an xcb_configure_notify_event_t */
00279     void *event = scalloc(32);
00280     xcb_client_message_event_t *ev = event;
00281 
00282     ev->response_type = XCB_CLIENT_MESSAGE;
00283     ev->window = window;
00284     ev->type = A_WM_PROTOCOLS;
00285     ev->format = 32;
00286     ev->data.data32[0] = A_WM_DELETE_WINDOW;
00287     ev->data.data32[1] = XCB_CURRENT_TIME;
00288 
00289     LOG("Sending WM_DELETE to the client\n");
00290     xcb_send_event(conn, false, window, XCB_EVENT_MASK_NO_EVENT, (char*)ev);
00291     xcb_flush(conn);
00292     free(event);
00293 }
00294 
00295 /*
00296  * Draws the decoration of the given container onto its parent.
00297  *
00298  */
00299 void x_draw_decoration(Con *con) {
00300     Con *parent = con->parent;
00301     bool leaf = con_is_leaf(con);
00302     /* This code needs to run for:
00303      *  • leaf containers
00304      *  • non-leaf containers which are in a stacked/tabbed container
00305      *
00306      * It does not need to run for:
00307      *  • floating containers (they don’t have a decoration)
00308      */
00309     if ((!leaf &&
00310          parent->layout != L_STACKED &&
00311          parent->layout != L_TABBED) ||
00312         con->type == CT_FLOATING_CON)
00313         return;
00314 
00315     /* Skip containers whose height is 0 (for example empty dockareas) */
00316     if (con->rect.height == 0)
00317         return;
00318 
00319     /* Skip containers whose pixmap has not yet been created (can happen when
00320      * decoration rendering happens recursively for a window for which
00321      * x_push_node() was not yet called) */
00322     if (leaf && con->pixmap == XCB_NONE)
00323         return;
00324 
00325     /* 1: build deco_params and compare with cache */
00326     struct deco_render_params *p = scalloc(sizeof(struct deco_render_params));
00327 
00328     /* find out which colors to use */
00329     if (con->urgent)
00330         p->color = &config.client.urgent;
00331     else if (con == focused || con_inside_focused(con))
00332         p->color = &config.client.focused;
00333     else if (con == TAILQ_FIRST(&(parent->focus_head)))
00334         p->color = &config.client.focused_inactive;
00335     else
00336         p->color = &config.client.unfocused;
00337 
00338     p->border_style = con_border_style(con);
00339 
00340     Rect *r = &(con->rect);
00341     Rect *w = &(con->window_rect);
00342     p->con_rect = (struct width_height){ r->width, r->height };
00343     p->con_window_rect = (struct width_height){ w->width, w->height };
00344     p->con_deco_rect = con->deco_rect;
00345     p->background = config.client.background;
00346     p->con_is_leaf = con_is_leaf(con);
00347 
00348     if (con->deco_render_params != NULL &&
00349         (con->window == NULL || !con->window->name_x_changed) &&
00350         !parent->pixmap_recreated &&
00351         !con->pixmap_recreated &&
00352         memcmp(p, con->deco_render_params, sizeof(struct deco_render_params)) == 0) {
00353         free(p);
00354         goto copy_pixmaps;
00355     }
00356 
00357     Con *next = con;
00358     while ((next = TAILQ_NEXT(next, nodes))) {
00359         FREE(next->deco_render_params);
00360     }
00361 
00362     FREE(con->deco_render_params);
00363     con->deco_render_params = p;
00364 
00365     if (con->window != NULL && con->window->name_x_changed)
00366         con->window->name_x_changed = false;
00367 
00368     parent->pixmap_recreated = false;
00369     con->pixmap_recreated = false;
00370 
00371     /* 2: draw the client.background, but only for the parts around the client_rect */
00372     if (con->window != NULL) {
00373         xcb_rectangle_t background[] = {
00374             /* top area */
00375             { 0, 0, r->width, w->y },
00376             /* bottom area */
00377             { 0, (w->y + w->height), r->width, r->height - (w->y + w->height) },
00378             /* left area */
00379             { 0, 0, w->x, r->height },
00380             /* right area */
00381             { w->x + w->width, 0, r->width - (w->x + w->width), r->height }
00382         };
00383 #if 0
00384         for (int i = 0; i < 4; i++)
00385             DLOG("rect is (%d, %d) with %d x %d\n",
00386                     background[i].x,
00387                     background[i].y,
00388                     background[i].width,
00389                     background[i].height
00390                 );
00391 #endif
00392 
00393         xcb_change_gc(conn, con->pm_gc, XCB_GC_FOREGROUND, (uint32_t[]) { config.client.background });
00394         xcb_poly_fill_rectangle(conn, con->pixmap, con->pm_gc, sizeof(background) / sizeof(xcb_rectangle_t), background);
00395     }
00396 
00397     /* 3: draw a rectangle in border color around the client */
00398     if (p->border_style != BS_NONE && p->con_is_leaf) {
00399         Rect br = con_border_style_rect(con);
00400 #if 0
00401         DLOG("con->rect spans %d x %d\n", con->rect.width, con->rect.height);
00402         DLOG("border_rect spans (%d, %d) with %d x %d\n", br.x, br.y, br.width, br.height);
00403         DLOG("window_rect spans (%d, %d) with %d x %d\n", con->window_rect.x, con->window_rect.y, con->window_rect.width, con->window_rect.height);
00404 #endif
00405 
00406         /* These rectangles represents the border around the child window
00407          * (left, bottom and right part). We don’t just fill the whole
00408          * rectangle because some childs are not freely resizable and we want
00409          * their background color to "shine through". */
00410         xcb_change_gc(conn, con->pm_gc, XCB_GC_FOREGROUND, (uint32_t[]){ p->color->background });
00411         xcb_rectangle_t borders[] = {
00412             { 0, 0, br.x, r->height },
00413             { 0, r->height + br.height + br.y, r->width, r->height },
00414             { r->width + br.width + br.x, 0, r->width, r->height }
00415         };
00416         xcb_poly_fill_rectangle(conn, con->pixmap, con->pm_gc, 3, borders);
00417         /* 1pixel border needs an additional line at the top */
00418         if (p->border_style == BS_1PIXEL) {
00419             xcb_rectangle_t topline = { br.x, 0, con->rect.width + br.width + br.x, br.y };
00420             xcb_poly_fill_rectangle(conn, con->pixmap, con->pm_gc, 1, &topline);
00421         }
00422 
00423         /* Highlight the side of the border at which the next window will be
00424          * opened if we are rendering a single window within a split container
00425          * (which is undistinguishable from a single window outside a split
00426          * container otherwise. */
00427         if (TAILQ_NEXT(con, nodes) == NULL &&
00428             TAILQ_PREV(con, nodes_head, nodes) == NULL &&
00429             con->parent->type != CT_FLOATING_CON) {
00430             xcb_change_gc(conn, con->pm_gc, XCB_GC_FOREGROUND, (uint32_t[]){ p->color->indicator });
00431             if (con_orientation(con->parent) == HORIZ)
00432                 xcb_poly_fill_rectangle(conn, con->pixmap, con->pm_gc, 1, (xcb_rectangle_t[]){
00433                         { r->width + br.width + br.x, 0, r->width, r->height + br.height } });
00434             else
00435                 xcb_poly_fill_rectangle(conn, con->pixmap, con->pm_gc, 1, (xcb_rectangle_t[]){
00436                         { br.x, r->height + br.height + br.y, r->width - (2 * br.x), r->height } });
00437         }
00438 
00439     }
00440 
00441     /* if this is a borderless/1pixel window, we don’t need to render the
00442      * decoration. */
00443     if (p->border_style != BS_NORMAL)
00444         goto copy_pixmaps;
00445 
00446     /* 4: paint the bar */
00447     xcb_change_gc(conn, parent->pm_gc, XCB_GC_FOREGROUND, (uint32_t[]){ p->color->background });
00448     xcb_rectangle_t drect = { con->deco_rect.x, con->deco_rect.y, con->deco_rect.width, con->deco_rect.height };
00449     xcb_poly_fill_rectangle(conn, parent->pixmap, parent->pm_gc, 1, &drect);
00450 
00451     /* 5: draw two unconnected lines in border color */
00452     xcb_change_gc(conn, parent->pm_gc, XCB_GC_FOREGROUND, (uint32_t[]){ p->color->border });
00453     Rect *dr = &(con->deco_rect);
00454     xcb_segment_t segments[] = {
00455         { dr->x,                 dr->y,
00456           dr->x + dr->width - 1, dr->y },
00457 
00458         { dr->x + 2,             dr->y + dr->height - 1,
00459           dr->x + dr->width - 3, dr->y + dr->height - 1 }
00460     };
00461     xcb_poly_segment(conn, parent->pixmap, parent->pm_gc, 2, segments);
00462 
00463     /* 6: draw the title */
00464     set_font_colors(parent->pm_gc, p->color->text, p->color->background);
00465     int text_offset_y = (con->deco_rect.height - config.font.height) / 2;
00466 
00467     struct Window *win = con->window;
00468     if (win == NULL || win->name_x == NULL) {
00469         /* this is a non-leaf container, we need to make up a good description */
00470         // TODO: use a good description instead of just "another container"
00471         draw_text("another container", strlen("another container"), false,
00472                 parent->pixmap, parent->pm_gc,
00473                 con->deco_rect.x + 2, con->deco_rect.y + text_offset_y,
00474                 con->deco_rect.width - 2);
00475         goto copy_pixmaps;
00476     }
00477 
00478     int indent_level = 0,
00479         indent_mult = 0;
00480     Con *il_parent = parent;
00481     if (il_parent->layout != L_STACKED) {
00482         while (1) {
00483             //DLOG("il_parent = %p, layout = %d\n", il_parent, il_parent->layout);
00484             if (il_parent->layout == L_STACKED)
00485                 indent_level++;
00486             if (il_parent->type == CT_WORKSPACE || il_parent->type == CT_DOCKAREA || il_parent->type == CT_OUTPUT)
00487                 break;
00488             il_parent = il_parent->parent;
00489             indent_mult++;
00490         }
00491     }
00492     //DLOG("indent_level = %d, indent_mult = %d\n", indent_level, indent_mult);
00493     int indent_px = (indent_level * 5) * indent_mult;
00494 
00495     draw_text(win->name_x, win->name_len, win->uses_net_wm_name,
00496             parent->pixmap, parent->pm_gc,
00497             con->deco_rect.x + 2 + indent_px, con->deco_rect.y + text_offset_y,
00498             con->deco_rect.width - 2 - indent_px);
00499 
00500     /* Since we don’t clip the text at all, it might in some cases be painted
00501      * on the border pixels on the right side of a window. Therefore, we draw
00502      * the right border again after rendering the text (and the unconnected
00503      * lines in border color). */
00504 
00505     /* Draw a separator line after every tab (except the last one), so that
00506      * tabs can be easily distinguished. */
00507     if (parent->layout == L_TABBED && TAILQ_NEXT(con, nodes) != NULL) {
00508         xcb_change_gc(conn, parent->pm_gc, XCB_GC_FOREGROUND, (uint32_t[]){ p->color->border });
00509     } else {
00510         xcb_change_gc(conn, parent->pm_gc, XCB_GC_FOREGROUND, (uint32_t[]){ p->color->background });
00511     }
00512     xcb_poly_line(conn, XCB_COORD_MODE_ORIGIN, parent->pixmap, parent->pm_gc, 4,
00513                   (xcb_point_t[]){
00514                       { dr->x + dr->width - 1, dr->y },
00515                       { dr->x + dr->width - 1, dr->y + dr->height },
00516                       { dr->x + dr->width - 2, dr->y },
00517                       { dr->x + dr->width - 2, dr->y + dr->height }
00518                   });
00519 
00520     xcb_change_gc(conn, parent->pm_gc, XCB_GC_FOREGROUND, (uint32_t[]){ p->color->border });
00521     xcb_poly_segment(conn, parent->pixmap, parent->pm_gc, 2, segments);
00522 
00523 copy_pixmaps:
00524     xcb_copy_area(conn, con->pixmap, con->frame, con->pm_gc, 0, 0, 0, 0, con->rect.width, con->rect.height);
00525 }
00526 
00527 /*
00528  * Recursively calls x_draw_decoration. This cannot be done in x_push_node
00529  * because x_push_node uses focus order to recurse (see the comment above)
00530  * while drawing the decoration needs to happen in the actual order.
00531  *
00532  */
00533 void x_deco_recurse(Con *con) {
00534     Con *current;
00535     bool leaf = TAILQ_EMPTY(&(con->nodes_head)) &&
00536                 TAILQ_EMPTY(&(con->floating_head));
00537     con_state *state = state_for_frame(con->frame);
00538 
00539     if (!leaf) {
00540         TAILQ_FOREACH(current, &(con->nodes_head), nodes)
00541             x_deco_recurse(current);
00542 
00543         TAILQ_FOREACH(current, &(con->floating_head), floating_windows)
00544             x_deco_recurse(current);
00545 
00546         if (state->mapped)
00547             xcb_copy_area(conn, con->pixmap, con->frame, con->pm_gc, 0, 0, 0, 0, con->rect.width, con->rect.height);
00548     }
00549 
00550     if ((con->type != CT_ROOT && con->type != CT_OUTPUT) &&
00551         (!leaf || con->mapped))
00552         x_draw_decoration(con);
00553 }
00554 
00555 /*
00556  * This function pushes the properties of each node of the layout tree to
00557  * X11 if they have changed (like the map state, position of the window, …).
00558  * It recursively traverses all children of the given node.
00559  *
00560  */
00561 void x_push_node(Con *con) {
00562     Con *current;
00563     con_state *state;
00564     Rect rect = con->rect;
00565 
00566     //DLOG("Pushing changes for node %p / %s\n", con, con->name);
00567     state = state_for_frame(con->frame);
00568 
00569     if (state->name != NULL) {
00570         DLOG("pushing name %s for con %p\n", state->name, con);
00571 
00572         xcb_change_property(conn, XCB_PROP_MODE_REPLACE, con->frame,
00573                             XCB_ATOM_WM_NAME, XCB_ATOM_STRING, 8, strlen(state->name), state->name);
00574         FREE(state->name);
00575     }
00576 
00577     if (con->window == NULL) {
00578         /* Calculate the height of all window decorations which will be drawn on to
00579          * this frame. */
00580         uint32_t max_y = 0, max_height = 0;
00581         TAILQ_FOREACH(current, &(con->nodes_head), nodes) {
00582             Rect *dr = &(current->deco_rect);
00583             if (dr->y >= max_y && dr->height >= max_height) {
00584                 max_y = dr->y;
00585                 max_height = dr->height;
00586             }
00587         }
00588         rect.height = max_y + max_height;
00589         if (rect.height == 0)
00590             con->mapped = false;
00591     }
00592 
00593     /* reparent the child window (when the window was moved due to a sticky
00594      * container) */
00595     if (state->need_reparent && con->window != NULL) {
00596         DLOG("Reparenting child window\n");
00597 
00598         /* Temporarily set the event masks to XCB_NONE so that we won’t get
00599          * UnmapNotify events (otherwise the handler would close the container).
00600          * These events are generated automatically when reparenting. */
00601         uint32_t values[] = { XCB_NONE };
00602         xcb_change_window_attributes(conn, state->old_frame, XCB_CW_EVENT_MASK, values);
00603         xcb_change_window_attributes(conn, con->window->id, XCB_CW_EVENT_MASK, values);
00604 
00605         xcb_reparent_window(conn, con->window->id, con->frame, 0, 0);
00606 
00607         values[0] = FRAME_EVENT_MASK;
00608         xcb_change_window_attributes(conn, state->old_frame, XCB_CW_EVENT_MASK, values);
00609         values[0] = CHILD_EVENT_MASK;
00610         xcb_change_window_attributes(conn, con->window->id, XCB_CW_EVENT_MASK, values);
00611 
00612         state->old_frame = XCB_NONE;
00613         state->need_reparent = false;
00614 
00615         con->ignore_unmap++;
00616         DLOG("ignore_unmap for reparenting of con %p (win 0x%08x) is now %d\n",
00617                 con, con->window->id, con->ignore_unmap);
00618     }
00619 
00620     bool fake_notify = false;
00621     /* Set new position if rect changed (and if height > 0) */
00622     if (memcmp(&(state->rect), &rect, sizeof(Rect)) != 0 &&
00623         rect.height > 0) {
00624         /* We first create the new pixmap, then render to it, set it as the
00625          * background and only afterwards change the window size. This reduces
00626          * flickering. */
00627 
00628         /* As the pixmap only depends on the size and not on the position, it
00629          * is enough to check if width/height have changed. Also, we don’t
00630          * create a pixmap at all when the window is actually not visible
00631          * (height == 0). */
00632         if ((state->rect.width != rect.width ||
00633             state->rect.height != rect.height)) {
00634             if (con->pixmap == 0) {
00635                 con->pixmap = xcb_generate_id(conn);
00636                 con->pm_gc = xcb_generate_id(conn);
00637             } else {
00638                 xcb_free_pixmap(conn, con->pixmap);
00639                 xcb_free_gc(conn, con->pm_gc);
00640             }
00641 
00642             uint16_t win_depth = root_depth;
00643             if (con->window)
00644                 win_depth = con->window->depth;
00645 
00646             xcb_create_pixmap(conn, win_depth, con->pixmap, con->frame, rect.width, rect.height);
00647 
00648             /* For the graphics context, we disable GraphicsExposure events.
00649              * Those will be sent when a CopyArea request cannot be fulfilled
00650              * properly due to parts of the source being unmapped or otherwise
00651              * unavailable. Since we always copy from pixmaps to windows, this
00652              * is not a concern for us. */
00653             uint32_t values[] = { 0 };
00654             xcb_create_gc(conn, con->pm_gc, con->pixmap, XCB_GC_GRAPHICS_EXPOSURES, values);
00655 
00656             con->pixmap_recreated = true;
00657 
00658             /* Don’t render the decoration for windows inside a stack which are
00659              * not visible right now */
00660             if (!con->parent ||
00661                 con->parent->layout != L_STACKED ||
00662                 TAILQ_FIRST(&(con->parent->focus_head)) == con)
00663                 /* Render the decoration now to make the correct decoration visible
00664                  * from the very first moment. Later calls will be cached, so this
00665                  * doesn’t hurt performance. */
00666                 x_deco_recurse(con);
00667         }
00668 
00669         DLOG("setting rect (%d, %d, %d, %d)\n", rect.x, rect.y, rect.width, rect.height);
00670         /* flush to ensure that the following commands are sent in a single
00671          * buffer and will be processed directly afterwards (the contents of a
00672          * window get lost when resizing it, therefore we want to provide it as
00673          * fast as possible) */
00674         xcb_flush(conn);
00675         xcb_set_window_rect(conn, con->frame, rect);
00676         if (con->pixmap != XCB_NONE)
00677             xcb_copy_area(conn, con->pixmap, con->frame, con->pm_gc, 0, 0, 0, 0, con->rect.width, con->rect.height);
00678         xcb_flush(conn);
00679 
00680         memcpy(&(state->rect), &rect, sizeof(Rect));
00681         fake_notify = true;
00682     }
00683 
00684     /* dito, but for child windows */
00685     if (con->window != NULL &&
00686         memcmp(&(state->window_rect), &(con->window_rect), sizeof(Rect)) != 0) {
00687         DLOG("setting window rect (%d, %d, %d, %d)\n",
00688             con->window_rect.x, con->window_rect.y, con->window_rect.width, con->window_rect.height);
00689         xcb_set_window_rect(conn, con->window->id, con->window_rect);
00690         memcpy(&(state->window_rect), &(con->window_rect), sizeof(Rect));
00691         fake_notify = true;
00692     }
00693 
00694     /* Map if map state changed, also ensure that the child window
00695      * is changed if we are mapped *and* in initial state (meaning the
00696      * container was empty before, but now got a child). Unmaps are handled in
00697      * x_push_node_unmaps(). */
00698     if ((state->mapped != con->mapped || (con->mapped && state->initial)) &&
00699         con->mapped) {
00700         xcb_void_cookie_t cookie;
00701 
00702         if (con->window != NULL) {
00703             /* Set WM_STATE_NORMAL because GTK applications don’t want to
00704              * drag & drop if we don’t. Also, xprop(1) needs it. */
00705             long data[] = { XCB_ICCCM_WM_STATE_NORMAL, XCB_NONE };
00706             xcb_change_property(conn, XCB_PROP_MODE_REPLACE, con->window->id,
00707                                 A_WM_STATE, A_WM_STATE, 32, 2, data);
00708         }
00709 
00710         uint32_t values[1];
00711         if (!state->child_mapped && con->window != NULL) {
00712             cookie = xcb_map_window(conn, con->window->id);
00713 
00714             /* We are interested in EnterNotifys as soon as the window is
00715              * mapped */
00716             values[0] = CHILD_EVENT_MASK;
00717             xcb_change_window_attributes(conn, con->window->id, XCB_CW_EVENT_MASK, values);
00718             DLOG("mapping child window (serial %d)\n", cookie.sequence);
00719             state->child_mapped = true;
00720         }
00721 
00722         cookie = xcb_map_window(conn, con->frame);
00723 
00724         values[0] = FRAME_EVENT_MASK;
00725         xcb_change_window_attributes(conn, con->frame, XCB_CW_EVENT_MASK, values);
00726 
00727         /* copy the pixmap contents to the frame window immediately after mapping */
00728         if (con->pixmap != XCB_NONE)
00729             xcb_copy_area(conn, con->pixmap, con->frame, con->pm_gc, 0, 0, 0, 0, con->rect.width, con->rect.height);
00730         xcb_flush(conn);
00731 
00732         DLOG("mapping container %08x (serial %d)\n", con->frame, cookie.sequence);
00733         state->mapped = con->mapped;
00734     }
00735 
00736     state->unmap_now = (state->mapped != con->mapped) && !con->mapped;
00737 
00738     if (fake_notify) {
00739         DLOG("Sending fake configure notify\n");
00740         fake_absolute_configure_notify(con);
00741     }
00742 
00743     /* Handle all children and floating windows of this node. We recurse
00744      * in focus order to display the focused client in a stack first when
00745      * switching workspaces (reduces flickering). */
00746     TAILQ_FOREACH(current, &(con->focus_head), focused)
00747         x_push_node(current);
00748 }
00749 
00750 /*
00751  * Same idea as in x_push_node(), but this function only unmaps windows. It is
00752  * necessary to split this up to handle new fullscreen clients properly: The
00753  * new window needs to be mapped and focus needs to be set *before* the
00754  * underlying windows are unmapped. Otherwise, focus will revert to the
00755  * PointerRoot and will then be set to the new window, generating unnecessary
00756  * FocusIn/FocusOut events.
00757  *
00758  */
00759 static void x_push_node_unmaps(Con *con) {
00760     Con *current;
00761     con_state *state;
00762 
00763     //DLOG("Pushing changes (with unmaps) for node %p / %s\n", con, con->name);
00764     state = state_for_frame(con->frame);
00765 
00766     /* map/unmap if map state changed, also ensure that the child window
00767      * is changed if we are mapped *and* in initial state (meaning the
00768      * container was empty before, but now got a child) */
00769     if (state->unmap_now) {
00770         xcb_void_cookie_t cookie;
00771         if (con->window != NULL) {
00772             /* Set WM_STATE_WITHDRAWN, it seems like Java apps need it */
00773             long data[] = { XCB_ICCCM_WM_STATE_WITHDRAWN, XCB_NONE };
00774             xcb_change_property(conn, XCB_PROP_MODE_REPLACE, con->window->id,
00775                                 A_WM_STATE, A_WM_STATE, 32, 2, data);
00776         }
00777 
00778         cookie = xcb_unmap_window(conn, con->frame);
00779         DLOG("unmapping container (serial %d)\n", cookie.sequence);
00780         /* we need to increase ignore_unmap for this container (if it
00781          * contains a window) and for every window "under" this one which
00782          * contains a window */
00783         if (con->window != NULL) {
00784             con->ignore_unmap++;
00785             DLOG("ignore_unmap for con %p (frame 0x%08x) now %d\n", con, con->frame, con->ignore_unmap);
00786         }
00787         state->mapped = con->mapped;
00788     }
00789 
00790     /* handle all children and floating windows of this node */
00791     TAILQ_FOREACH(current, &(con->nodes_head), nodes)
00792         x_push_node_unmaps(current);
00793 
00794     TAILQ_FOREACH(current, &(con->floating_head), floating_windows)
00795         x_push_node_unmaps(current);
00796 }
00797 
00798 /*
00799  * Pushes all changes (state of each node, see x_push_node() and the window
00800  * stack) to X11.
00801  *
00802  * NOTE: We need to push the stack first so that the windows have the correct
00803  * stacking order. This is relevant for workspace switching where we map the
00804  * windows because mapping may generate EnterNotify events. When they are
00805  * generated in the wrong order, this will cause focus problems when switching
00806  * workspaces.
00807  *
00808  */
00809 void x_push_changes(Con *con) {
00810     con_state *state;
00811     xcb_query_pointer_cookie_t pointercookie;
00812 
00813     /* If we need to warp later, we request the pointer position as soon as possible */
00814     if (warp_to) {
00815         pointercookie = xcb_query_pointer(conn, root);
00816     }
00817 
00818     DLOG("-- PUSHING WINDOW STACK --\n");
00819     //DLOG("Disabling EnterNotify\n");
00820     uint32_t values[1] = { XCB_NONE };
00821     CIRCLEQ_FOREACH_REVERSE(state, &state_head, state) {
00822         if (state->mapped)
00823             xcb_change_window_attributes(conn, state->id, XCB_CW_EVENT_MASK, values);
00824     }
00825     //DLOG("Done, EnterNotify disabled\n");
00826     bool order_changed = false;
00827     bool stacking_changed = false;
00828 
00829     /* count first, necessary to (re)allocate memory for the bottom-to-top
00830      * stack afterwards */
00831     int cnt = 0;
00832     CIRCLEQ_FOREACH_REVERSE(state, &state_head, state)
00833         if (state->con && state->con->window)
00834             cnt++;
00835 
00836     if (cnt != btt_stack_num) {
00837         btt_stack = srealloc(btt_stack, sizeof(xcb_window_t) * cnt);
00838         btt_stack_num = cnt;
00839     }
00840 
00841     xcb_window_t *walk = btt_stack;
00842 
00843     /* X11 correctly represents the stack if we push it from bottom to top */
00844     CIRCLEQ_FOREACH_REVERSE(state, &state_head, state) {
00845         if (state->con && state->con->window)
00846             memcpy(walk++, &(state->con->window->id), sizeof(xcb_window_t));
00847 
00848         //DLOG("stack: 0x%08x\n", state->id);
00849         con_state *prev = CIRCLEQ_PREV(state, state);
00850         con_state *old_prev = CIRCLEQ_PREV(state, old_state);
00851         if (prev != old_prev)
00852             order_changed = true;
00853         if ((state->initial || order_changed) && prev != CIRCLEQ_END(&state_head)) {
00854             stacking_changed = true;
00855             //DLOG("Stacking 0x%08x above 0x%08x\n", prev->id, state->id);
00856             uint32_t mask = 0;
00857             mask |= XCB_CONFIG_WINDOW_SIBLING;
00858             mask |= XCB_CONFIG_WINDOW_STACK_MODE;
00859             uint32_t values[] = {state->id, XCB_STACK_MODE_ABOVE};
00860 
00861             xcb_configure_window(conn, prev->id, mask, values);
00862         }
00863         state->initial = false;
00864     }
00865 
00866     /* If we re-stacked something (or a new window appeared), we need to update
00867      * the _NET_CLIENT_LIST_STACKING hint */
00868     if (stacking_changed)
00869         ewmh_update_client_list_stacking(btt_stack, btt_stack_num);
00870 
00871     DLOG("PUSHING CHANGES\n");
00872     x_push_node(con);
00873 
00874     if (warp_to) {
00875         xcb_query_pointer_reply_t *pointerreply = xcb_query_pointer_reply(conn, pointercookie, NULL);
00876         if (!pointerreply) {
00877             ELOG("Could not query pointer position, not warping pointer\n");
00878         } else {
00879             int mid_x = warp_to->x + (warp_to->width / 2);
00880             int mid_y = warp_to->y + (warp_to->height / 2);
00881 
00882             Output *current = get_output_containing(pointerreply->root_x, pointerreply->root_y);
00883             Output *target = get_output_containing(mid_x, mid_y);
00884             if (current != target)
00885                 xcb_warp_pointer(conn, XCB_NONE, root, 0, 0, 0, 0, mid_x, mid_y);
00886         }
00887         warp_to = NULL;
00888     }
00889 
00890     //DLOG("Re-enabling EnterNotify\n");
00891     values[0] = FRAME_EVENT_MASK;
00892     CIRCLEQ_FOREACH_REVERSE(state, &state_head, state) {
00893         if (state->mapped)
00894             xcb_change_window_attributes(conn, state->id, XCB_CW_EVENT_MASK, values);
00895     }
00896     //DLOG("Done, EnterNotify re-enabled\n");
00897 
00898     x_deco_recurse(con);
00899 
00900     xcb_window_t to_focus = focused->frame;
00901     if (focused->window != NULL)
00902         to_focus = focused->window->id;
00903 
00904     if (focused_id != to_focus) {
00905         if (!focused->mapped) {
00906             DLOG("Not updating focus (to %p / %s), focused window is not mapped.\n", focused, focused->name);
00907             /* Invalidate focused_id to correctly focus new windows with the same ID */
00908             focused_id = XCB_NONE;
00909         } else {
00910             bool set_focus = true;
00911             if (focused->window != NULL &&
00912                 focused->window->needs_take_focus) {
00913                 DLOG("Updating focus by sending WM_TAKE_FOCUS to window 0x%08x (focused: %p / %s)\n",
00914                      to_focus, focused, focused->name);
00915                 send_take_focus(to_focus);
00916                 set_focus = !focused->window->doesnt_accept_focus;
00917                 DLOG("set_focus = %d\n", set_focus);
00918             }
00919 
00920             if (set_focus) {
00921                 DLOG("Updating focus (focused: %p / %s)\n", focused, focused->name);
00922                 /* We remove XCB_EVENT_MASK_FOCUS_CHANGE from the event mask to get
00923                  * no focus change events for our own focus changes. We only want
00924                  * these generated by the clients. */
00925                 if (focused->window != NULL) {
00926                     values[0] = CHILD_EVENT_MASK & ~(XCB_EVENT_MASK_FOCUS_CHANGE);
00927                     xcb_change_window_attributes(conn, focused->window->id, XCB_CW_EVENT_MASK, values);
00928                 }
00929                 xcb_set_input_focus(conn, XCB_INPUT_FOCUS_POINTER_ROOT, to_focus, XCB_CURRENT_TIME);
00930                 if (focused->window != NULL) {
00931                     values[0] = CHILD_EVENT_MASK;
00932                     xcb_change_window_attributes(conn, focused->window->id, XCB_CW_EVENT_MASK, values);
00933                 }
00934 
00935                 ewmh_update_active_window(to_focus);
00936             }
00937 
00938             focused_id = to_focus;
00939         }
00940     }
00941 
00942     if (focused_id == XCB_NONE) {
00943         DLOG("Still no window focused, better set focus to the root window\n");
00944         xcb_set_input_focus(conn, XCB_INPUT_FOCUS_POINTER_ROOT, root, XCB_CURRENT_TIME);
00945         focused_id = root;
00946     }
00947 
00948     xcb_flush(conn);
00949     DLOG("ENDING CHANGES\n");
00950 
00951     /* Disable EnterWindow events for windows which will be unmapped in
00952      * x_push_node_unmaps() now. Unmapping windows happens when switching
00953      * workspaces. We want to avoid getting EnterNotifies during that phase
00954      * because they would screw up our focus. One of these cases is having a
00955      * stack with two windows. If the first window is focused and gets
00956      * unmapped, the second one appears under the cursor and therefore gets an
00957      * EnterNotify event. */
00958     values[0] = FRAME_EVENT_MASK & ~XCB_EVENT_MASK_ENTER_WINDOW;
00959     CIRCLEQ_FOREACH_REVERSE(state, &state_head, state) {
00960         if (!state->unmap_now)
00961             continue;
00962         xcb_change_window_attributes(conn, state->id, XCB_CW_EVENT_MASK, values);
00963     }
00964 
00965     /* Push all pending unmaps */
00966     x_push_node_unmaps(con);
00967 
00968     /* save the current stack as old stack */
00969     CIRCLEQ_FOREACH(state, &state_head, state) {
00970         CIRCLEQ_REMOVE(&old_state_head, state, old_state);
00971         CIRCLEQ_INSERT_TAIL(&old_state_head, state, old_state);
00972     }
00973     //CIRCLEQ_FOREACH(state, &old_state_head, old_state) {
00974     //    DLOG("old stack: 0x%08x\n", state->id);
00975     //}
00976 
00977     xcb_flush(conn);
00978 }
00979 
00980 /*
00981  * Raises the specified container in the internal stack of X windows. The
00982  * next call to x_push_changes() will make the change visible in X11.
00983  *
00984  */
00985 void x_raise_con(Con *con) {
00986     con_state *state;
00987     state = state_for_frame(con->frame);
00988     //DLOG("raising in new stack: %p / %s / %s / xid %08x\n", con, con->name, con->window ? con->window->name_json : "", state->id);
00989 
00990     CIRCLEQ_REMOVE(&state_head, state, state);
00991     CIRCLEQ_INSERT_HEAD(&state_head, state, state);
00992 }
00993 
00994 /*
00995  * Sets the WM_NAME property (so, no UTF8, but used only for debugging anyways)
00996  * of the given name. Used for properly tagging the windows for easily spotting
00997  * i3 windows in xwininfo -root -all.
00998  *
00999  */
01000 void x_set_name(Con *con, const char *name) {
01001     struct con_state *state;
01002 
01003     if ((state = state_for_frame(con->frame)) == NULL) {
01004         ELOG("window state not found\n");
01005         return;
01006     }
01007 
01008     FREE(state->name);
01009     state->name = sstrdup(name);
01010 }
01011 
01012 /*
01013  * Sets up i3 specific atoms (I3_SOCKET_PATH and I3_CONFIG_PATH)
01014  *
01015  */
01016 void x_set_i3_atoms(void) {
01017     xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root, A_I3_SOCKET_PATH, A_UTF8_STRING, 8,
01018                         (current_socketpath == NULL ? 0 : strlen(current_socketpath)),
01019                         current_socketpath);
01020     xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root, A_I3_CONFIG_PATH, A_UTF8_STRING, 8,
01021                         strlen(current_configpath), current_configpath);
01022     xcb_change_property(conn, XCB_PROP_MODE_REPLACE, root, A_I3_SHMLOG_PATH, A_UTF8_STRING, 8,
01023                         strlen(shmlogname), shmlogname);
01024 }
01025 
01026 /*
01027  * Set warp_to coordinates.  This will trigger on the next call to
01028  * x_push_changes().
01029  *
01030  */
01031 void x_set_warp_to(Rect *rect)
01032 {
01033     warp_to = rect;
01034 }
01035 
01036 /*
01037  * Applies the given mask to the event mask of every i3 window decoration X11
01038  * window. This is useful to disable EnterNotify while resizing so that focus
01039  * is untouched.
01040  *
01041  */
01042 void x_mask_event_mask(uint32_t mask) {
01043     uint32_t values[] = { FRAME_EVENT_MASK & mask };
01044 
01045     con_state *state;
01046     CIRCLEQ_FOREACH_REVERSE(state, &state_head, state) {
01047         if (state->mapped)
01048             xcb_change_window_attributes(conn, state->id, XCB_CW_EVENT_MASK, values);
01049     }
01050 }