4 * i3 - an improved dynamic tiling window manager
6 * © 2009-2010 Michael Stapelberg and contributors
8 * See file LICENSE for license information.
10 * xcb.c: Helper functions for easier usage of XCB
19 #include <xcb/xcb_keysyms.h>
26 TAILQ_HEAD(cached_fonts_head, Font) cached_fonts = TAILQ_HEAD_INITIALIZER(cached_fonts);
27 unsigned int xcb_numlock_mask;
30 * Loads a font for usage, getting its height. This function is used very often, so it
34 i3Font *load_font(xcb_connection_t *conn, const char *pattern) {
35 /* Check if we got the font cached */
37 TAILQ_FOREACH(font, &cached_fonts, fonts)
38 if (strcmp(font->pattern, pattern) == 0)
41 i3Font *new = smalloc(sizeof(i3Font));
42 xcb_void_cookie_t font_cookie;
43 xcb_list_fonts_with_info_cookie_t info_cookie;
45 /* Send all our requests first */
46 new->id = xcb_generate_id(conn);
47 font_cookie = xcb_open_font_checked(conn, new->id, strlen(pattern), pattern);
48 info_cookie = xcb_list_fonts_with_info(conn, 1, strlen(pattern), pattern);
50 check_error(conn, font_cookie, "Could not open font");
52 /* Get information (height/name) for this font */
53 xcb_list_fonts_with_info_reply_t *reply = xcb_list_fonts_with_info_reply(conn, info_cookie, NULL);
54 exit_if_null(reply, "Could not load font \"%s\"\n", pattern);
56 if (asprintf(&(new->name), "%.*s", xcb_list_fonts_with_info_name_length(reply),
57 xcb_list_fonts_with_info_name(reply)) == -1)
58 die("asprintf() failed\n");
59 new->pattern = sstrdup(pattern);
60 new->height = reply->font_ascent + reply->font_descent;
62 /* Insert into cache */
63 TAILQ_INSERT_TAIL(&cached_fonts, new, fonts);
69 * Returns the colorpixel to use for the given hex color (think of HTML).
71 * The hex_color has to start with #, for example #FF00FF.
73 * NOTE that get_colorpixel() does _NOT_ check the given color code for validity.
74 * This has to be done by the caller.
77 uint32_t get_colorpixel(xcb_connection_t *conn, char *hex) {
78 char strgroups[3][3] = {{hex[1], hex[2], '\0'},
79 {hex[3], hex[4], '\0'},
80 {hex[5], hex[6], '\0'}};
81 uint32_t rgb16[3] = {(strtol(strgroups[0], NULL, 16)),
82 (strtol(strgroups[1], NULL, 16)),
83 (strtol(strgroups[2], NULL, 16))};
85 return (rgb16[0] << 16) + (rgb16[1] << 8) + rgb16[2];
89 * Convenience wrapper around xcb_create_window which takes care of depth, generating an ID and checking
93 xcb_window_t create_window(xcb_connection_t *conn, Rect dims, uint16_t window_class, int cursor,
94 bool map, uint32_t mask, uint32_t *values) {
95 xcb_window_t result = xcb_generate_id(conn);
96 xcb_cursor_t cursor_id = xcb_generate_id(conn);
98 /* If the window class is XCB_WINDOW_CLASS_INPUT_ONLY, depth has to be 0 */
99 uint16_t depth = (window_class == XCB_WINDOW_CLASS_INPUT_ONLY ? 0 : XCB_COPY_FROM_PARENT);
101 xcb_create_window(conn,
103 result, /* the window id */
104 root, /* parent == root */
105 dims.x, dims.y, dims.width, dims.height, /* dimensions */
106 0, /* border = 0, we draw our own */
108 XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
113 i3Font *cursor_font = load_font(conn, "cursor");
114 xcb_create_glyph_cursor(conn, cursor_id, cursor_font->id, cursor_font->id,
115 (cursor == -1 ? XCB_CURSOR_LEFT_PTR : cursor),
116 (cursor == -1 ? XCB_CURSOR_LEFT_PTR : cursor) + 1,
117 0, 0, 0, 65535, 65535, 65535);
118 xcb_change_window_attributes(conn, result, XCB_CW_CURSOR, &cursor_id);
119 xcb_free_cursor(conn, cursor_id);
121 /* Map the window (= make it visible) */
123 xcb_map_window(conn, result);
129 * Changes a single value in the graphic context (so one doesn’t have to define an array of values)
132 void xcb_change_gc_single(xcb_connection_t *conn, xcb_gcontext_t gc, uint32_t mask, uint32_t value) {
133 xcb_change_gc(conn, gc, mask, &value);
137 * Draws a line from x,y to to_x,to_y using the given color
140 void xcb_draw_line(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc,
141 uint32_t colorpixel, uint32_t x, uint32_t y, uint32_t to_x, uint32_t to_y) {
142 xcb_change_gc_single(conn, gc, XCB_GC_FOREGROUND, colorpixel);
143 xcb_point_t points[] = {{x, y}, {to_x, to_y}};
144 xcb_poly_line(conn, XCB_COORD_MODE_ORIGIN, drawable, gc, 2, points);
148 * Draws a rectangle from x,y with width,height using the given color
151 void xcb_draw_rect(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc,
152 uint32_t colorpixel, uint32_t x, uint32_t y, uint32_t width, uint32_t height) {
153 xcb_change_gc_single(conn, gc, XCB_GC_FOREGROUND, colorpixel);
154 xcb_rectangle_t rect = {x, y, width, height};
155 xcb_poly_fill_rectangle(conn, drawable, gc, 1, &rect);
159 * Generates a configure_notify event and sends it to the given window
160 * Applications need this to think they’ve configured themselves correctly.
161 * The truth is, however, that we will manage them.
164 void fake_configure_notify(xcb_connection_t *conn, Rect r, xcb_window_t window) {
165 xcb_configure_notify_event_t generated_event;
167 generated_event.event = window;
168 generated_event.window = window;
169 generated_event.response_type = XCB_CONFIGURE_NOTIFY;
171 generated_event.x = r.x;
172 generated_event.y = r.y;
173 generated_event.width = r.width;
174 generated_event.height = r.height;
176 generated_event.border_width = 0;
177 generated_event.above_sibling = XCB_NONE;
178 generated_event.override_redirect = false;
180 xcb_send_event(conn, false, window, XCB_EVENT_MASK_STRUCTURE_NOTIFY, (char*)&generated_event);
185 * Generates a configure_notify_event with absolute coordinates (relative to the X root
186 * window, not to the client’s frame) for the given client.
189 void fake_absolute_configure_notify(xcb_connection_t *conn, Client *client) {
192 absolute.x = client->rect.x + client->child_rect.x;
193 absolute.y = client->rect.y + client->child_rect.y;
194 absolute.width = client->child_rect.width;
195 absolute.height = client->child_rect.height;
197 fake_configure_notify(conn, absolute, client->child);
201 * Finds out which modifier mask is the one for numlock, as the user may change this.
204 void xcb_get_numlock_mask(xcb_connection_t *conn) {
205 xcb_key_symbols_t *keysyms;
206 xcb_get_modifier_mapping_cookie_t cookie;
207 xcb_get_modifier_mapping_reply_t *reply;
208 xcb_keycode_t *modmap;
210 const int masks[8] = { XCB_MOD_MASK_SHIFT,
212 XCB_MOD_MASK_CONTROL,
219 /* Request the modifier map */
220 cookie = xcb_get_modifier_mapping_unchecked(conn);
222 /* Get the keysymbols */
223 keysyms = xcb_key_symbols_alloc(conn);
225 if ((reply = xcb_get_modifier_mapping_reply(conn, cookie, NULL)) == NULL) {
226 xcb_key_symbols_free(keysyms);
230 modmap = xcb_get_modifier_mapping_keycodes(reply);
232 /* Get the keycode for numlock */
233 #ifdef OLD_XCB_KEYSYMS_API
234 xcb_keycode_t numlock = xcb_key_symbols_get_keycode(keysyms, XCB_NUM_LOCK);
236 /* For now, we only use the first keysymbol. */
237 xcb_keycode_t *numlock_syms = xcb_key_symbols_get_keycode(keysyms, XCB_NUM_LOCK);
238 if (numlock_syms == NULL)
240 xcb_keycode_t numlock = *numlock_syms;
244 /* Check all modifiers (Mod1-Mod5, Shift, Control, Lock) */
245 for (mask = 0; mask < 8; mask++)
246 for (i = 0; i < reply->keycodes_per_modifier; i++)
247 if (modmap[(mask * reply->keycodes_per_modifier) + i] == numlock)
248 xcb_numlock_mask = masks[mask];
250 xcb_key_symbols_free(keysyms);
255 * Raises the given window (typically client->frame) above all other windows
258 void xcb_raise_window(xcb_connection_t *conn, xcb_window_t window) {
259 uint32_t values[] = { XCB_STACK_MODE_ABOVE };
260 xcb_configure_window(conn, window, XCB_CONFIG_WINDOW_STACK_MODE, values);
265 * Prepares the given Cached_Pixmap for usage (checks whether the size of the
266 * object this pixmap is related to (e.g. a window) has changed and re-creates
270 void cached_pixmap_prepare(xcb_connection_t *conn, struct Cached_Pixmap *pixmap) {
271 DLOG("preparing pixmap\n");
273 /* If the Rect did not change, the pixmap does not need to be recreated */
274 if (memcmp(&(pixmap->rect), pixmap->referred_rect, sizeof(Rect)) == 0)
277 memcpy(&(pixmap->rect), pixmap->referred_rect, sizeof(Rect));
279 if (pixmap->id == 0 || pixmap->gc == 0) {
280 DLOG("Creating new pixmap...\n");
281 pixmap->id = xcb_generate_id(conn);
282 pixmap->gc = xcb_generate_id(conn);
284 DLOG("Re-creating this pixmap...\n");
285 xcb_free_gc(conn, pixmap->gc);
286 xcb_free_pixmap(conn, pixmap->id);
289 xcb_create_pixmap(conn, root_depth, pixmap->id,
290 pixmap->referred_drawable, pixmap->rect.width, pixmap->rect.height);
292 xcb_create_gc(conn, pixmap->gc, pixmap->id, 0, 0);
296 * Query the width of the given text (16-bit characters, UCS) with given real
297 * length (amount of glyphs) using the given font.
300 int predict_text_width(xcb_connection_t *conn, const char *font_pattern, char *text, int length) {
301 i3Font *font = load_font(conn, font_pattern);
303 xcb_query_text_extents_cookie_t cookie;
304 xcb_query_text_extents_reply_t *reply;
305 xcb_generic_error_t *error;
308 cookie = xcb_query_text_extents(conn, font->id, length, (xcb_char2b_t*)text);
309 if ((reply = xcb_query_text_extents_reply(conn, cookie, &error)) == NULL) {
310 ELOG("Could not get text extents (X error code %d)\n",
312 /* We return the rather safe guess of 7 pixels, because a
313 * rendering error is better than a crash. Plus, the user will
314 * see the error in his log. */
318 width = reply->overall_width;
324 * Configures the given window to have the size/position specified by given rect
327 void xcb_set_window_rect(xcb_connection_t *conn, xcb_window_t window, Rect r) {
328 xcb_configure_window(conn, window,
329 XCB_CONFIG_WINDOW_X |
330 XCB_CONFIG_WINDOW_Y |
331 XCB_CONFIG_WINDOW_WIDTH |
332 XCB_CONFIG_WINDOW_HEIGHT,