git.sur5r.net Git - i3/i3lock/blob - xcb.c

   1 /*
   2  * vim:ts=4:sw=4:expandtab
   3  *
   4  * © 2010 Michael Stapelberg
   5  *
   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.
   8  *
   9  */
  10 #include <xcb/xcb.h>
  11 #include <xcb/xcb_keysyms.h>
  12 #include <xcb/xcb_image.h>
  13 #include <xcb/dpms.h>
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <stdbool.h>
  17 #include <unistd.h>
  18 #include <assert.h>
  19 #include <err.h>
  20
  21 #include "cursors.h"
  22
  23 static uint32_t get_colorpixel(char *hex) {
  24     char strgroups[3][3] = {{hex[0], hex[1], '\0'},
  25                             {hex[2], hex[3], '\0'},
  26                             {hex[4], hex[5], '\0'}};
  27     uint32_t rgb16[3] = {(strtol(strgroups[0], NULL, 16)),
  28                          (strtol(strgroups[1], NULL, 16)),
  29                          (strtol(strgroups[2], NULL, 16))};
  30
  31     return (rgb16[0] << 16) + (rgb16[1] << 8) + rgb16[2];
  32 }
  33
  34 xcb_visualtype_t *get_root_visual_type(xcb_screen_t *screen) {
  35     xcb_visualtype_t *visual_type = NULL;
  36     xcb_depth_iterator_t depth_iter;
  37     xcb_visualtype_iterator_t visual_iter;
  38
  39     for (depth_iter = xcb_screen_allowed_depths_iterator(screen);
  40          depth_iter.rem;
  41          xcb_depth_next(&depth_iter)) {
  42
  43         for (visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
  44              visual_iter.rem;
  45              xcb_visualtype_next(&visual_iter)) {
  46             if (screen->root_visual != visual_iter.data->visual_id)
  47                 continue;
  48
  49             visual_type = visual_iter.data;
  50             return visual_type;
  51         }
  52     }
  53
  54     return NULL;
  55 }
  56
  57 xcb_window_t open_fullscreen_window(xcb_connection_t *conn, xcb_screen_t *scr, char *color) {
  58     uint32_t mask = 0;
  59     uint32_t values[3];
  60     xcb_window_t win = xcb_generate_id(conn);
  61
  62     mask |= XCB_CW_BACK_PIXEL;
  63     values[0] = get_colorpixel(color);
  64
  65     mask |= XCB_CW_OVERRIDE_REDIRECT;
  66     values[1] = 1;
  67
  68     mask |= XCB_CW_EVENT_MASK;
  69     values[2] = XCB_EVENT_MASK_EXPOSURE |
  70                 XCB_EVENT_MASK_KEY_PRESS |
  71                 XCB_EVENT_MASK_KEY_RELEASE |
  72                 XCB_EVENT_MASK_VISIBILITY_CHANGE;
  73
  74     xcb_create_window(conn,
  75                       24,
  76                       win, /* the window id */
  77                       scr->root, /* parent == root */
  78                       0, 0,
  79                       scr->width_in_pixels,
  80                       scr->height_in_pixels, /* dimensions */
  81                       0, /* border = 0, we draw our own */
  82                       XCB_WINDOW_CLASS_INPUT_OUTPUT,
  83                       XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
  84                       mask,
  85                       values);
  86
  87     /* Map the window (= make it visible) */
  88     xcb_map_window(conn, win);
  89
  90     /* Raise window (put it on top) */
  91     values[0] = XCB_STACK_MODE_ABOVE;
  92     xcb_configure_window(conn, win, XCB_CONFIG_WINDOW_STACK_MODE, values);
  93
  94     return win;
  95 }
  96
  97 /*
  98  * Returns the mask for Mode_switch (to be used for looking up keysymbols by
  99  * keycode).
 100  *
 101  */
 102 uint32_t get_mod_mask(xcb_connection_t *conn, xcb_key_symbols_t *symbols, uint32_t keycode) {
 103     xcb_get_modifier_mapping_reply_t *modmap_r;
 104     xcb_keycode_t *modmap, kc;
 105     xcb_keycode_t *modeswitchcodes = xcb_key_symbols_get_keycode(symbols, keycode);
 106     if (modeswitchcodes == NULL)
 107         return 0;
 108
 109     modmap_r = xcb_get_modifier_mapping_reply(conn, xcb_get_modifier_mapping(conn), NULL);
 110     modmap = xcb_get_modifier_mapping_keycodes(modmap_r);
 111
 112     for (int i = 0; i < 8; i++)
 113         for (int j = 0; j < modmap_r->keycodes_per_modifier; j++) {
 114             kc = modmap[i * modmap_r->keycodes_per_modifier + j];
 115             for (xcb_keycode_t *ktest = modeswitchcodes; *ktest; ktest++) {
 116                 if (*ktest != kc)
 117                     continue;
 118
 119                 free(modeswitchcodes);
 120                 free(modmap_r);
 121                 return (1 << i);
 122             }
 123         }
 124
 125     return 0;
 126 }
 127
 128 void dpms_turn_off_screen(xcb_connection_t *conn) {
 129     xcb_dpms_enable(conn);
 130     xcb_dpms_force_level(conn, XCB_DPMS_DPMS_MODE_OFF);
 131     xcb_flush(conn);
 132 }
 133
 134 /*
 135  * Repeatedly tries to grab pointer and keyboard (up to 1000 times).
 136  *
 137  */
 138 void grab_pointer_and_keyboard(xcb_connection_t *conn, xcb_screen_t *screen, xcb_cursor_t cursor) {
 139     xcb_grab_pointer_cookie_t pcookie;
 140     xcb_grab_pointer_reply_t *preply;
 141
 142     xcb_grab_keyboard_cookie_t kcookie;
 143     xcb_grab_keyboard_reply_t *kreply;
 144
 145     int tries = 10000;
 146
 147     while (tries-- > 0) {
 148         pcookie = xcb_grab_pointer(
 149             conn,
 150             false,               /* get all pointer events specified by the following mask */
 151             screen->root,        /* grab the root window */
 152             XCB_NONE,            /* which events to let through */
 153             XCB_GRAB_MODE_ASYNC, /* pointer events should continue as normal */
 154             XCB_GRAB_MODE_ASYNC, /* keyboard mode */
 155             XCB_NONE,            /* confine_to = in which window should the cursor stay */
 156             cursor,              /* we change the cursor to whatever the user wanted */
 157             XCB_CURRENT_TIME
 158         );
 159
 160         if ((preply = xcb_grab_pointer_reply(conn, pcookie, NULL)) &&
 161             preply->status == XCB_GRAB_STATUS_SUCCESS) {
 162             free(preply);
 163             break;
 164         }
 165
 166         /* Make this quite a bit slower */
 167         usleep(50);
 168     }
 169
 170     if (cursor != XCB_NONE)
 171         xcb_free_cursor(conn, cursor);
 172
 173     while (tries-- > 0) {
 174         kcookie = xcb_grab_keyboard(
 175             conn,
 176             true,                /* report events */
 177             screen->root,        /* grab the root window */
 178             XCB_CURRENT_TIME,
 179             XCB_GRAB_MODE_ASYNC, /* process events as normal, do not require sync */
 180             XCB_GRAB_MODE_ASYNC
 181         );
 182
 183         if ((kreply = xcb_grab_keyboard_reply(conn, kcookie, NULL)) &&
 184             kreply->status == XCB_GRAB_STATUS_SUCCESS) {
 185             free(kreply);
 186             break;
 187         }
 188
 189         /* Make this quite a bit slower */
 190         usleep(50);
 191     }
 192
 193     if (tries <= 0)
 194         errx(EXIT_FAILURE, "Cannot grab pointer/keyboard");
 195 }
 196
 197 xcb_cursor_t create_cursor(xcb_connection_t *conn, xcb_screen_t *screen, xcb_window_t win, int choice) {
 198     xcb_pixmap_t bitmap;
 199     xcb_pixmap_t mask;
 200     xcb_cursor_t cursor;
 201
 202     unsigned char* curs_bits;
 203     unsigned char* mask_bits;
 204     int curs_w, curs_h;
 205
 206     switch (choice) {
 207         case CURS_NONE:
 208             curs_bits = curs_invisible_bits;
 209             mask_bits = curs_invisible_bits;
 210             curs_w = curs_invisible_width;
 211             curs_h = curs_invisible_height;
 212             break;
 213         case CURS_WIN:
 214             curs_bits = curs_windows_bits;
 215             mask_bits = mask_windows_bits;
 216             curs_w = curs_windows_width;
 217             curs_h = curs_windows_height;
 218             break;
 219         case CURS_DEFAULT:
 220         default:
 221             return XCB_NONE; /* XCB_NONE is xcb's way of saying "don't change the cursor" */
 222     }
 223
 224     bitmap = xcb_create_pixmap_from_bitmap_data(conn,
 225                                                 win,
 226                                                 curs_bits,
 227                                                 curs_w,
 228                                                 curs_h,
 229                                                 1,
 230                                                 screen->white_pixel,
 231                                                 screen->black_pixel,
 232                                                 NULL);
 233
 234     mask = xcb_create_pixmap_from_bitmap_data(conn,
 235                                               win,
 236                                               mask_bits,
 237                                               curs_w,
 238                                               curs_h,
 239                                               1,
 240                                               screen->white_pixel,
 241                                               screen->black_pixel,
 242                                               NULL);
 243
 244     cursor = xcb_generate_id(conn);
 245
 246     xcb_create_cursor(conn,
 247                       cursor,
 248                       bitmap,
 249                       mask,
 250                       65535,65535,65535,
 251                       0,0,0,
 252                       0,0);
 253
 254     xcb_free_pixmap(conn, bitmap);
 255     xcb_free_pixmap(conn, mask);
 256
 257     return cursor;
 258 }