2 * vim:ts=4:sw=4:expandtab
4 * © 2010-2011 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>
12 #include <xcb/xcb_image.h>
23 #define curs_invisible_width 8
24 #define curs_invisible_height 8
26 static unsigned char curs_invisible_bits[] = {
27 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
29 #define curs_windows_width 11
30 #define curs_windows_height 19
32 static unsigned char curs_windows_bits[] = {
33 0xfe, 0x07, 0xfc, 0x07, 0xfa, 0x07, 0xf6, 0x07, 0xee, 0x07, 0xde, 0x07,
34 0xbe, 0x07, 0x7e, 0x07, 0xfe, 0x06, 0xfe, 0x05, 0x3e, 0x00, 0xb6, 0x07,
35 0x6a, 0x07, 0x6c, 0x07, 0xde, 0x06, 0xdf, 0x06, 0xbf, 0x05, 0xbf, 0x05,
38 #define mask_windows_width 11
39 #define mask_windows_height 19
41 static unsigned char mask_windows_bits[] = {
42 0x01, 0x00, 0x03, 0x00, 0x07, 0x00, 0x0f, 0x00, 0x1f, 0x00, 0x3f, 0x00,
43 0x7f, 0x00, 0xff, 0x00, 0xff, 0x01, 0xff, 0x03, 0xff, 0x07, 0x7f, 0x00,
44 0xf7, 0x00, 0xf3, 0x00, 0xe1, 0x01, 0xe0, 0x01, 0xc0, 0x03, 0xc0, 0x03,
47 static uint32_t get_colorpixel(char *hex) {
48 char strgroups[3][3] = {{hex[0], hex[1], '\0'},
49 {hex[2], hex[3], '\0'},
50 {hex[4], hex[5], '\0'}};
51 uint32_t rgb16[3] = {(strtol(strgroups[0], NULL, 16)),
52 (strtol(strgroups[1], NULL, 16)),
53 (strtol(strgroups[2], NULL, 16))};
55 return (rgb16[0] << 16) + (rgb16[1] << 8) + rgb16[2];
58 xcb_visualtype_t *get_root_visual_type(xcb_screen_t *screen) {
59 xcb_visualtype_t *visual_type = NULL;
60 xcb_depth_iterator_t depth_iter;
61 xcb_visualtype_iterator_t visual_iter;
63 for (depth_iter = xcb_screen_allowed_depths_iterator(screen);
65 xcb_depth_next(&depth_iter)) {
67 for (visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
69 xcb_visualtype_next(&visual_iter)) {
70 if (screen->root_visual != visual_iter.data->visual_id)
73 visual_type = visual_iter.data;
81 xcb_pixmap_t create_bg_pixmap(xcb_connection_t *conn, xcb_screen_t *scr, char *color) {
82 xcb_pixmap_t bg_pixmap = xcb_generate_id(conn);
83 xcb_create_pixmap(conn, scr->root_depth, bg_pixmap, scr->root,
84 scr->width_in_pixels, scr->height_in_pixels);
86 /* Generate a Graphics Context and fill the pixmap with background color
87 * (for images that are smaller than your screen) */
88 xcb_gcontext_t gc = xcb_generate_id(conn);
89 uint32_t values[] = { get_colorpixel(color) };
90 xcb_create_gc(conn, gc, bg_pixmap, XCB_GC_FOREGROUND, values);
91 xcb_rectangle_t rect = { 0, 0, scr->width_in_pixels, scr->height_in_pixels };
92 xcb_poly_fill_rectangle(conn, bg_pixmap, gc, 1, &rect);
97 xcb_window_t open_fullscreen_window(xcb_connection_t *conn, xcb_screen_t *scr, char *color, xcb_pixmap_t pixmap) {
100 xcb_window_t win = xcb_generate_id(conn);
102 if (pixmap == XCB_NONE) {
103 mask |= XCB_CW_BACK_PIXEL;
104 values[0] = get_colorpixel(color);
106 mask |= XCB_CW_BACK_PIXMAP;
110 mask |= XCB_CW_OVERRIDE_REDIRECT;
113 mask |= XCB_CW_EVENT_MASK;
114 values[2] = XCB_EVENT_MASK_EXPOSURE |
115 XCB_EVENT_MASK_KEY_PRESS |
116 XCB_EVENT_MASK_KEY_RELEASE |
117 XCB_EVENT_MASK_VISIBILITY_CHANGE;
119 xcb_create_window(conn,
121 win, /* the window id */
122 scr->root, /* parent == root */
124 scr->width_in_pixels,
125 scr->height_in_pixels, /* dimensions */
126 0, /* border = 0, we draw our own */
127 XCB_WINDOW_CLASS_INPUT_OUTPUT,
128 XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
132 /* Map the window (= make it visible) */
133 xcb_map_window(conn, win);
135 /* Raise window (put it on top) */
136 values[0] = XCB_STACK_MODE_ABOVE;
137 xcb_configure_window(conn, win, XCB_CONFIG_WINDOW_STACK_MODE, values);
143 * Returns the mask for Mode_switch (to be used for looking up keysymbols by
147 uint32_t get_mod_mask(xcb_connection_t *conn, xcb_key_symbols_t *symbols, uint32_t keycode) {
148 xcb_get_modifier_mapping_reply_t *modmap_r;
149 xcb_keycode_t *modmap, kc;
150 xcb_keycode_t *modeswitchcodes = xcb_key_symbols_get_keycode(symbols, keycode);
151 if (modeswitchcodes == NULL)
154 modmap_r = xcb_get_modifier_mapping_reply(conn, xcb_get_modifier_mapping(conn), NULL);
155 modmap = xcb_get_modifier_mapping_keycodes(modmap_r);
157 for (int i = 0; i < 8; i++)
158 for (int j = 0; j < modmap_r->keycodes_per_modifier; j++) {
159 kc = modmap[i * modmap_r->keycodes_per_modifier + j];
160 for (xcb_keycode_t *ktest = modeswitchcodes; *ktest; ktest++) {
164 free(modeswitchcodes);
173 void dpms_turn_off_screen(xcb_connection_t *conn) {
174 xcb_dpms_enable(conn);
175 xcb_dpms_force_level(conn, XCB_DPMS_DPMS_MODE_OFF);
180 * Repeatedly tries to grab pointer and keyboard (up to 1000 times).
183 void grab_pointer_and_keyboard(xcb_connection_t *conn, xcb_screen_t *screen, xcb_cursor_t cursor) {
184 xcb_grab_pointer_cookie_t pcookie;
185 xcb_grab_pointer_reply_t *preply;
187 xcb_grab_keyboard_cookie_t kcookie;
188 xcb_grab_keyboard_reply_t *kreply;
192 while (tries-- > 0) {
193 pcookie = xcb_grab_pointer(
195 false, /* get all pointer events specified by the following mask */
196 screen->root, /* grab the root window */
197 XCB_NONE, /* which events to let through */
198 XCB_GRAB_MODE_ASYNC, /* pointer events should continue as normal */
199 XCB_GRAB_MODE_ASYNC, /* keyboard mode */
200 XCB_NONE, /* confine_to = in which window should the cursor stay */
201 cursor, /* we change the cursor to whatever the user wanted */
205 if ((preply = xcb_grab_pointer_reply(conn, pcookie, NULL)) &&
206 preply->status == XCB_GRAB_STATUS_SUCCESS) {
211 /* Make this quite a bit slower */
215 while (tries-- > 0) {
216 kcookie = xcb_grab_keyboard(
218 true, /* report events */
219 screen->root, /* grab the root window */
221 XCB_GRAB_MODE_ASYNC, /* process events as normal, do not require sync */
225 if ((kreply = xcb_grab_keyboard_reply(conn, kcookie, NULL)) &&
226 kreply->status == XCB_GRAB_STATUS_SUCCESS) {
231 /* Make this quite a bit slower */
236 errx(EXIT_FAILURE, "Cannot grab pointer/keyboard");
239 xcb_cursor_t create_cursor(xcb_connection_t *conn, xcb_screen_t *screen, xcb_window_t win, int choice) {
244 unsigned char* curs_bits;
245 unsigned char* mask_bits;
250 curs_bits = curs_invisible_bits;
251 mask_bits = curs_invisible_bits;
252 curs_w = curs_invisible_width;
253 curs_h = curs_invisible_height;
256 curs_bits = curs_windows_bits;
257 mask_bits = mask_windows_bits;
258 curs_w = curs_windows_width;
259 curs_h = curs_windows_height;
263 return XCB_NONE; /* XCB_NONE is xcb's way of saying "don't change the cursor" */
266 bitmap = xcb_create_pixmap_from_bitmap_data(conn,
276 mask = xcb_create_pixmap_from_bitmap_data(conn,
286 cursor = xcb_generate_id(conn);
288 xcb_create_cursor(conn,
296 xcb_free_pixmap(conn, bitmap);
297 xcb_free_pixmap(conn, mask);