2 * vim:ts=4:sw=4:expandtab
4 * © 2010 Michael Stapelberg
6 * xcb.c: contains all functions which use XCB to talk to X11. Mostly wrappers
7 * around the rather complicated/ugly parts of the XCB API.
11 #include <xcb/xcb_keysyms.h>
20 static uint32_t get_colorpixel(char *hex) {
21 char strgroups[3][3] = {{hex[0], hex[1], '\0'},
22 {hex[2], hex[3], '\0'},
23 {hex[4], hex[5], '\0'}};
24 uint32_t rgb16[3] = {(strtol(strgroups[0], NULL, 16)),
25 (strtol(strgroups[1], NULL, 16)),
26 (strtol(strgroups[2], NULL, 16))};
28 return (rgb16[0] << 16) + (rgb16[1] << 8) + rgb16[2];
31 xcb_visualtype_t *get_root_visual_type(xcb_screen_t *screen) {
32 xcb_visualtype_t *visual_type = NULL;
33 xcb_depth_iterator_t depth_iter;
34 xcb_visualtype_iterator_t visual_iter;
36 for (depth_iter = xcb_screen_allowed_depths_iterator(screen);
38 xcb_depth_next(&depth_iter)) {
40 for (visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
42 xcb_visualtype_next(&visual_iter)) {
43 if (screen->root_visual != visual_iter.data->visual_id)
46 visual_type = visual_iter.data;
54 xcb_window_t open_fullscreen_window(xcb_connection_t *conn, xcb_screen_t *scr, char *color) {
57 xcb_window_t win = xcb_generate_id(conn);
59 mask |= XCB_CW_BACK_PIXEL;
60 values[0] = get_colorpixel(color);
62 mask |= XCB_CW_OVERRIDE_REDIRECT;
65 mask |= XCB_CW_EVENT_MASK;
66 values[2] = XCB_EVENT_MASK_EXPOSURE |
67 XCB_EVENT_MASK_KEY_PRESS |
68 XCB_EVENT_MASK_KEY_RELEASE |
69 XCB_EVENT_MASK_VISIBILITY_CHANGE;
71 xcb_create_window(conn,
73 win, /* the window id */
74 scr->root, /* parent == root */
77 scr->height_in_pixels, /* dimensions */
78 0, /* border = 0, we draw our own */
79 XCB_WINDOW_CLASS_INPUT_OUTPUT,
80 XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
84 /* Map the window (= make it visible) */
85 xcb_map_window(conn, win);
87 /* Raise window (put it on top) */
88 values[0] = XCB_STACK_MODE_ABOVE;
89 xcb_configure_window(conn, win, XCB_CONFIG_WINDOW_STACK_MODE, values);
95 * Returns the mask for Mode_switch (to be used for looking up keysymbols by
99 uint32_t get_mod_mask(xcb_connection_t *conn, xcb_key_symbols_t *symbols, uint32_t keycode) {
100 xcb_get_modifier_mapping_reply_t *modmap_r;
101 xcb_keycode_t *modmap, kc;
102 xcb_keycode_t *modeswitchcodes = xcb_key_symbols_get_keycode(symbols, keycode);
103 if (modeswitchcodes == NULL)
106 modmap_r = xcb_get_modifier_mapping_reply(conn, xcb_get_modifier_mapping(conn), NULL);
107 modmap = xcb_get_modifier_mapping_keycodes(modmap_r);
109 for (int i = 0; i < 8; i++)
110 for (int j = 0; j < modmap_r->keycodes_per_modifier; j++) {
111 kc = modmap[i * modmap_r->keycodes_per_modifier + j];
112 for (xcb_keycode_t *ktest = modeswitchcodes; *ktest; ktest++) {
116 free(modeswitchcodes);
125 void dpms_turn_off_screen(xcb_connection_t *conn) {
126 xcb_dpms_enable(conn);
127 xcb_dpms_force_level(conn, XCB_DPMS_DPMS_MODE_OFF);
132 * Repeatedly tries to grab pointer and keyboard (up to 1000 times).
135 void grab_pointer_and_keyboard(xcb_connection_t *conn, xcb_screen_t *screen) {
136 xcb_grab_pointer_cookie_t pcookie;
137 xcb_grab_pointer_reply_t *preply;
139 xcb_grab_keyboard_cookie_t kcookie;
140 xcb_grab_keyboard_reply_t *kreply;
144 while (tries-- > 0) {
145 pcookie = xcb_grab_pointer(
147 false, /* get all pointer events specified by the following mask */
148 screen->root, /* grab the root window */
149 XCB_NONE, /* which events to let through */
150 XCB_GRAB_MODE_ASYNC, /* pointer events should continue as normal */
151 XCB_GRAB_MODE_ASYNC, /* keyboard mode */
152 XCB_NONE, /* confine_to = in which window should the cursor stay */
153 XCB_NONE, /* don’t display a special cursor */
157 if ((preply = xcb_grab_pointer_reply(conn, pcookie, NULL)) &&
158 preply->status == XCB_GRAB_STATUS_SUCCESS) {
163 /* Make this quite a bit slower */
167 while (tries-- > 0) {
168 kcookie = xcb_grab_keyboard(
170 true, /* report events */
171 screen->root, /* grab the root window */
173 XCB_GRAB_MODE_ASYNC, /* process events as normal, do not require sync */
177 if ((kreply = xcb_grab_keyboard_reply(conn, kcookie, NULL)) &&
178 kreply->status == XCB_GRAB_STATUS_SUCCESS) {
183 /* Make this quite a bit slower */
188 errx(EXIT_FAILURE, "Cannot grab pointer/keyboard");