4 * i3 - an improved dynamic tiling window manager
6 * © 2009 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 root = xcb_setup_roots_iterator(xcb_get_setup(conn)).data->root;
96 xcb_window_t result = xcb_generate_id(conn);
97 xcb_cursor_t cursor_id = xcb_generate_id(conn);
99 /* If the window class is XCB_WINDOW_CLASS_INPUT_ONLY, depth has to be 0 */
100 uint16_t depth = (window_class == XCB_WINDOW_CLASS_INPUT_ONLY ? 0 : XCB_COPY_FROM_PARENT);
102 /* Use the default cursor (left pointer) */
104 i3Font *cursor_font = load_font(conn, "cursor");
105 xcb_create_glyph_cursor(conn, cursor_id, cursor_font->id, cursor_font->id,
106 XCB_CURSOR_LEFT_PTR, XCB_CURSOR_LEFT_PTR + 1,
107 0, 0, 0, 65535, 65535, 65535);
110 xcb_create_window(conn,
112 result, /* the window id */
113 root, /* parent == root */
114 dims.x, dims.y, dims.width, dims.height, /* dimensions */
115 0, /* border = 0, we draw our own */
117 XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
122 xcb_change_window_attributes(conn, result, XCB_CW_CURSOR, &cursor_id);
124 /* Map the window (= make it visible) */
126 xcb_map_window(conn, result);
132 * Changes a single value in the graphic context (so one doesn’t have to define an array of values)
135 void xcb_change_gc_single(xcb_connection_t *conn, xcb_gcontext_t gc, uint32_t mask, uint32_t value) {
136 xcb_change_gc(conn, gc, mask, &value);
140 * Draws a line from x,y to to_x,to_y using the given color
143 void xcb_draw_line(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc,
144 uint32_t colorpixel, uint32_t x, uint32_t y, uint32_t to_x, uint32_t to_y) {
145 xcb_change_gc_single(conn, gc, XCB_GC_FOREGROUND, colorpixel);
146 xcb_point_t points[] = {{x, y}, {to_x, to_y}};
147 xcb_poly_line(conn, XCB_COORD_MODE_ORIGIN, drawable, gc, 2, points);
151 * Draws a rectangle from x,y with width,height using the given color
154 void xcb_draw_rect(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc,
155 uint32_t colorpixel, uint32_t x, uint32_t y, uint32_t width, uint32_t height) {
156 xcb_change_gc_single(conn, gc, XCB_GC_FOREGROUND, colorpixel);
157 xcb_rectangle_t rect = {x, y, width, height};
158 xcb_poly_fill_rectangle(conn, drawable, gc, 1, &rect);
162 * Generates a configure_notify event and sends it to the given window
163 * Applications need this to think they’ve configured themselves correctly.
164 * The truth is, however, that we will manage them.
167 void fake_configure_notify(xcb_connection_t *conn, Rect r, xcb_window_t window) {
168 xcb_configure_notify_event_t generated_event;
170 generated_event.event = window;
171 generated_event.window = window;
172 generated_event.response_type = XCB_CONFIGURE_NOTIFY;
174 generated_event.x = r.x;
175 generated_event.y = r.y;
176 generated_event.width = r.width;
177 generated_event.height = r.height;
179 generated_event.border_width = 0;
180 generated_event.above_sibling = XCB_NONE;
181 generated_event.override_redirect = false;
183 xcb_send_event(conn, false, window, XCB_EVENT_MASK_STRUCTURE_NOTIFY, (char*)&generated_event);
188 * Generates a configure_notify_event with absolute coordinates (relative to the X root
189 * window, not to the client’s frame) for the given client.
192 void fake_absolute_configure_notify(xcb_connection_t *conn, Client *client) {
195 absolute.x = client->rect.x + client->child_rect.x;
196 absolute.y = client->rect.y + client->child_rect.y;
197 absolute.width = client->child_rect.width;
198 absolute.height = client->child_rect.height;
200 fake_configure_notify(conn, absolute, client->child);
204 * Finds out which modifier mask is the one for numlock, as the user may change this.
207 void xcb_get_numlock_mask(xcb_connection_t *conn) {
208 xcb_key_symbols_t *keysyms;
209 xcb_get_modifier_mapping_cookie_t cookie;
210 xcb_get_modifier_mapping_reply_t *reply;
211 xcb_keycode_t *modmap;
213 const int masks[8] = { XCB_MOD_MASK_SHIFT,
215 XCB_MOD_MASK_CONTROL,
222 /* Request the modifier map */
223 cookie = xcb_get_modifier_mapping_unchecked(conn);
225 /* Get the keysymbols */
226 keysyms = xcb_key_symbols_alloc(conn);
228 if ((reply = xcb_get_modifier_mapping_reply(conn, cookie, NULL)) == NULL) {
229 xcb_key_symbols_free(keysyms);
233 modmap = xcb_get_modifier_mapping_keycodes(reply);
235 /* Get the keycode for numlock */
236 #ifdef OLD_XCB_KEYSYMS_API
237 xcb_keycode_t numlock = xcb_key_symbols_get_keycode(keysyms, XCB_NUM_LOCK);
239 /* For now, we only use the first keysymbol. */
240 xcb_keycode_t *numlock_syms = xcb_key_symbols_get_keycode(keysyms, XCB_NUM_LOCK);
241 if (numlock_syms == NULL)
243 xcb_keycode_t numlock = *numlock_syms;
247 /* Check all modifiers (Mod1-Mod5, Shift, Control, Lock) */
248 for (mask = 0; mask < 8; mask++)
249 for (i = 0; i < reply->keycodes_per_modifier; i++)
250 if (modmap[(mask * reply->keycodes_per_modifier) + i] == numlock)
251 xcb_numlock_mask = masks[mask];
253 xcb_key_symbols_free(keysyms);
258 * Raises the given window (typically client->frame) above all other windows
261 void xcb_raise_window(xcb_connection_t *conn, xcb_window_t window) {
262 uint32_t values[] = { XCB_STACK_MODE_ABOVE };
263 xcb_configure_window(conn, window, XCB_CONFIG_WINDOW_STACK_MODE, values);
268 * Prepares the given Cached_Pixmap for usage (checks whether the size of the
269 * object this pixmap is related to (e.g. a window) has changed and re-creates
273 void cached_pixmap_prepare(xcb_connection_t *conn, struct Cached_Pixmap *pixmap) {
274 DLOG("preparing pixmap\n");
276 /* If the Rect did not change, the pixmap does not need to be recreated */
277 if (memcmp(&(pixmap->rect), pixmap->referred_rect, sizeof(Rect)) == 0)
280 memcpy(&(pixmap->rect), pixmap->referred_rect, sizeof(Rect));
282 if (pixmap->id == 0 || pixmap->gc == 0) {
283 DLOG("Creating new pixmap...\n");
284 pixmap->id = xcb_generate_id(conn);
285 pixmap->gc = xcb_generate_id(conn);
287 DLOG("Re-creating this pixmap...\n");
288 xcb_free_gc(conn, pixmap->gc);
289 xcb_free_pixmap(conn, pixmap->id);
292 xcb_create_pixmap(conn, root_depth, pixmap->id,
293 pixmap->referred_drawable, pixmap->rect.width, pixmap->rect.height);
295 xcb_create_gc(conn, pixmap->gc, pixmap->id, 0, 0);
299 * Returns the xcb_charinfo_t for the given character (specified by row and
300 * column in the lookup table) if existing, otherwise the minimum bounds.
303 static xcb_charinfo_t *get_charinfo(int col, int row, xcb_query_font_reply_t *font_info,
304 xcb_charinfo_t *table, bool dont_fallback) {
305 xcb_charinfo_t *result;
307 /* Bounds checking */
308 if (row < font_info->min_byte1 || row > font_info->max_byte1 ||
309 col < font_info->min_char_or_byte2 || col > font_info->max_char_or_byte2)
312 /* If we don’t have a table to lookup the infos per character, return the
315 return &font_info->min_bounds;
317 result = &table[((row - font_info->min_byte1) *
318 (font_info->max_char_or_byte2 - font_info->min_char_or_byte2 + 1)) +
319 (col - font_info->min_char_or_byte2)];
321 /* If the character has an entry in the table, return it */
322 if (result->character_width != 0 ||
323 (result->right_side_bearing |
324 result->left_side_bearing |
326 result->descent) != 0)
329 /* Otherwise, get the default character and return its charinfo */
333 return get_charinfo((font_info->default_char >> 8),
334 (font_info->default_char & 0xFF),
341 * Calculate the width of the given text (16-bit characters, UCS) with given
342 * real length (amount of glyphs) using the given font.
345 int predict_text_width(xcb_connection_t *conn, const char *font_pattern, char *text, int length) {
346 xcb_query_font_reply_t *font_info;
347 xcb_charinfo_t *table;
348 xcb_generic_error_t *error;
350 i3Font *font = load_font(conn, font_pattern);
352 font_info = xcb_query_font_reply(conn, xcb_query_font(conn, font->id), &error);
354 fprintf(stderr, "ERROR: query font (X error code %d)\n", error->error_code);
355 /* We return the rather safe guess of 7 pixels, because a
356 * rendering error is better than a crash. Plus, the user will
357 * see the error on his stderr. */
361 /* If no per-char info is available for this font, we use the default */
362 if (xcb_query_font_char_infos_length(font_info) == 0) {
363 DLOG("Falling back on default char_width of %d pixels\n", font_info->max_bounds.character_width);
364 return (font_info->max_bounds.character_width * length);
367 table = xcb_query_font_char_infos(font_info);
369 for (i = 0; i < 2 * length; i += 2) {
370 xcb_charinfo_t *info = get_charinfo(text[i+1], text[i], font_info, table, false);
373 width += info->character_width;