2 * vim:ts=4:sw=4:expandtab
4 * i3 - an improved dynamic tiling window manager
5 * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
7 * xcb.c: Helper functions for easier usage of XCB
12 TAILQ_HEAD(cached_fonts_head, Font) cached_fonts = TAILQ_HEAD_INITIALIZER(cached_fonts);
13 unsigned int xcb_numlock_mask;
16 * Loads a font for usage, also getting its height. If fallback is true,
17 * i3 loads 'fixed' or '-misc-*' if the font cannot be found instead of
21 i3Font load_font(const char *pattern, bool fallback) {
23 xcb_void_cookie_t font_cookie;
24 xcb_list_fonts_with_info_cookie_t info_cookie;
26 /* Send all our requests first */
27 new.id = xcb_generate_id(conn);
28 font_cookie = xcb_open_font_checked(conn, new.id, strlen(pattern), pattern);
29 info_cookie = xcb_list_fonts_with_info(conn, 1, strlen(pattern), pattern);
31 /* Check for errors. If errors, fall back to default font. */
32 xcb_generic_error_t *error = xcb_request_check(conn, font_cookie);
34 /* If we fail to open font, fall back to 'fixed'. If opening 'fixed' fails fall back to '-misc-*' */
35 if (fallback && error != NULL) {
36 ELOG("Could not open font %s (X error %d). Reverting to backup font.\n", pattern, error->error_code);
38 font_cookie = xcb_open_font_checked(conn, new.id, strlen(pattern), pattern);
39 info_cookie = xcb_list_fonts_with_info(conn, 1, strlen(pattern), pattern);
41 /* Check if we managed to open 'fixed' */
42 xcb_generic_error_t *error = xcb_request_check(conn, font_cookie);
44 /* Fall back to '-misc-*' if opening 'fixed' fails. */
46 ELOG("Could not open fallback font '%s', trying with '-misc-*'\n",pattern);
48 font_cookie = xcb_open_font_checked(conn, new.id, strlen(pattern), pattern);
49 info_cookie = xcb_list_fonts_with_info(conn, 1, strlen(pattern), pattern);
51 check_error(conn, font_cookie, "Could open neither requested font nor fallback (fixed or -misc-*");
55 /* Get information (height/name) for this font */
56 xcb_list_fonts_with_info_reply_t *reply = xcb_list_fonts_with_info_reply(conn, info_cookie, NULL);
57 exit_if_null(reply, "Could not load font \"%s\"\n", pattern);
59 new.height = reply->font_ascent + reply->font_descent;
67 * Convenience wrapper around xcb_create_window which takes care of depth, generating an ID and checking
71 xcb_window_t create_window(xcb_connection_t *conn, Rect dims, uint16_t window_class,
72 enum xcursor_cursor_t cursor, bool map, uint32_t mask, uint32_t *values) {
73 xcb_window_t result = xcb_generate_id(conn);
75 /* If the window class is XCB_WINDOW_CLASS_INPUT_ONLY, depth has to be 0 */
76 uint16_t depth = (window_class == XCB_WINDOW_CLASS_INPUT_ONLY ? 0 : XCB_COPY_FROM_PARENT);
78 xcb_create_window(conn,
80 result, /* the window id */
81 root, /* parent == root */
82 dims.x, dims.y, dims.width, dims.height, /* dimensions */
83 0, /* border = 0, we draw our own */
85 XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
90 if (xcursor_supported) {
92 values[0] = xcursor_get_cursor(cursor);
93 xcb_change_window_attributes(conn, result, mask, values);
95 xcb_cursor_t cursor_id = xcb_generate_id(conn);
96 i3Font cursor_font = load_font("cursor", false);
97 int xcb_cursor = xcursor_get_xcb_cursor(cursor);
98 xcb_create_glyph_cursor(conn, cursor_id, cursor_font.id, cursor_font.id,
99 xcb_cursor, xcb_cursor + 1, 0, 0, 0, 65535, 65535, 65535);
100 xcb_change_window_attributes(conn, result, XCB_CW_CURSOR, &cursor_id);
101 xcb_free_cursor(conn, cursor_id);
104 /* Map the window (= make it visible) */
106 xcb_map_window(conn, result);
112 * Draws a line from x,y to to_x,to_y using the given color
115 void xcb_draw_line(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc,
116 uint32_t colorpixel, uint32_t x, uint32_t y, uint32_t to_x, uint32_t to_y) {
117 xcb_change_gc(conn, gc, XCB_GC_FOREGROUND, (uint32_t[]){ colorpixel });
118 xcb_poly_line(conn, XCB_COORD_MODE_ORIGIN, drawable, gc, 2,
119 (xcb_point_t[]) { {x, y}, {to_x, to_y} });
123 * Draws a rectangle from x,y with width,height using the given color
126 void xcb_draw_rect(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc,
127 uint32_t colorpixel, uint32_t x, uint32_t y, uint32_t width, uint32_t height) {
128 xcb_change_gc(conn, gc, XCB_GC_FOREGROUND, (uint32_t[]){ colorpixel });
129 xcb_rectangle_t rect = {x, y, width, height};
130 xcb_poly_fill_rectangle(conn, drawable, gc, 1, &rect);
134 * Generates a configure_notify_event with absolute coordinates (relative to the X root
135 * window, not to the client’s frame) for the given client.
138 void fake_absolute_configure_notify(Con *con) {
139 xcb_rectangle_t absolute;
140 if (con->window == NULL)
143 absolute.x = con->rect.x + con->window_rect.x;
144 absolute.y = con->rect.y + con->window_rect.y;
145 absolute.width = con->window_rect.width;
146 absolute.height = con->window_rect.height;
148 DLOG("fake rect = (%d, %d, %d, %d)\n", absolute.x, absolute.y, absolute.width, absolute.height);
150 fake_configure_notify(conn, absolute, con->window->id, con->border_width);
154 * Sends the WM_TAKE_FOCUS ClientMessage to the given window
157 void send_take_focus(xcb_window_t window) {
158 /* Every X11 event is 32 bytes long. Therefore, XCB will copy 32 bytes.
159 * In order to properly initialize these bytes, we allocate 32 bytes even
160 * though we only need less for an xcb_configure_notify_event_t */
161 void *event = scalloc(32);
162 xcb_client_message_event_t *ev = event;
164 ev->response_type = XCB_CLIENT_MESSAGE;
166 ev->type = A_WM_PROTOCOLS;
168 ev->data.data32[0] = A_WM_TAKE_FOCUS;
169 ev->data.data32[1] = XCB_CURRENT_TIME;
171 DLOG("Sending WM_TAKE_FOCUS to the client\n");
172 xcb_send_event(conn, false, window, XCB_EVENT_MASK_NO_EVENT, (char*)ev);
177 * Raises the given window (typically client->frame) above all other windows
180 void xcb_raise_window(xcb_connection_t *conn, xcb_window_t window) {
181 uint32_t values[] = { XCB_STACK_MODE_ABOVE };
182 xcb_configure_window(conn, window, XCB_CONFIG_WINDOW_STACK_MODE, values);
186 * Query the width of the given text (16-bit characters, UCS) with given real
187 * length (amount of glyphs) using the given font.
190 int predict_text_width(char *text, int length) {
191 xcb_query_text_extents_cookie_t cookie;
192 xcb_query_text_extents_reply_t *reply;
193 xcb_generic_error_t *error;
196 cookie = xcb_query_text_extents(conn, config.font.id, length, (xcb_char2b_t*)text);
197 if ((reply = xcb_query_text_extents_reply(conn, cookie, &error)) == NULL) {
198 ELOG("Could not get text extents (X error code %d)\n",
200 /* We return the rather safe guess of 7 pixels, because a
201 * rendering error is better than a crash. Plus, the user will
202 * see the error in his log. */
206 width = reply->overall_width;
212 * Configures the given window to have the size/position specified by given rect
215 void xcb_set_window_rect(xcb_connection_t *conn, xcb_window_t window, Rect r) {
216 xcb_void_cookie_t cookie;
217 cookie = xcb_configure_window(conn, window,
218 XCB_CONFIG_WINDOW_X |
219 XCB_CONFIG_WINDOW_Y |
220 XCB_CONFIG_WINDOW_WIDTH |
221 XCB_CONFIG_WINDOW_HEIGHT,
223 /* ignore events which are generated because we configured a window */
224 add_ignore_event(cookie.sequence, -1);
228 * Returns true if the given reply contains the given atom.
231 bool xcb_reply_contains_atom(xcb_get_property_reply_t *prop, xcb_atom_t atom) {
232 if (prop == NULL || xcb_get_property_value_length(prop) == 0)
236 if ((atoms = xcb_get_property_value(prop)) == NULL)
239 for (int i = 0; i < xcb_get_property_value_length(prop) / (prop->format / 8); i++)
240 if (atoms[i] == atom)
248 * Moves the mouse pointer into the middle of rect.
251 void xcb_warp_pointer_rect(xcb_connection_t *conn, Rect *rect) {
252 int mid_x = rect->x + (rect->width / 2);
253 int mid_y = rect->y + (rect->height / 2);
255 LOG("warp pointer to: %d %d\n", mid_x, mid_y);
256 xcb_warp_pointer(conn, XCB_NONE, root, 0, 0, 0, 0, mid_x, mid_y);
260 * Set the cursor of the root window to the given cursor id.
261 * This function should only be used if xcursor_supported == false.
262 * Otherwise, use xcursor_set_root_cursor().
265 void xcb_set_root_cursor(int cursor) {
266 xcb_cursor_t cursor_id = xcb_generate_id(conn);
267 i3Font cursor_font = load_font("cursor", false);
268 int xcb_cursor = xcursor_get_xcb_cursor(cursor);
269 xcb_create_glyph_cursor(conn, cursor_id, cursor_font.id, cursor_font.id,
270 xcb_cursor, xcb_cursor + 1, 0, 0, 0, 65535, 65535, 65535);
271 xcb_change_window_attributes(conn, root, XCB_CW_CURSOR, &cursor_id);
272 xcb_free_cursor(conn, cursor_id);