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

   1 /*
   2  * vim:ts=4:sw=4:expandtab
   3  *
   4  * © 2010-2011 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 #define curs_invisible_width 8
  24 #define curs_invisible_height 8
  25
  26 static unsigned char curs_invisible_bits[] = {
  27  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
  28
  29 #define curs_windows_width 11
  30 #define curs_windows_height 19
  31
  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,
  36  0x7f, 0x06 };
  37
  38 #define mask_windows_width 11
  39 #define mask_windows_height 19
  40
  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,
  45  0x80, 0x01 };
  46
  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))};
  54
  55     return (rgb16[0] << 16) + (rgb16[1] << 8) + rgb16[2];
  56 }
  57
  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;
  62
  63     for (depth_iter = xcb_screen_allowed_depths_iterator(screen);
  64          depth_iter.rem;
  65          xcb_depth_next(&depth_iter)) {
  66
  67         for (visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
  68              visual_iter.rem;
  69              xcb_visualtype_next(&visual_iter)) {
  70             if (screen->root_visual != visual_iter.data->visual_id)
  71                 continue;
  72
  73             visual_type = visual_iter.data;
  74             return visual_type;
  75         }
  76     }
  77
  78     return NULL;
  79 }
  80
  81 xcb_window_t open_fullscreen_window(xcb_connection_t *conn, xcb_screen_t *scr, char *color) {
  82     uint32_t mask = 0;
  83     uint32_t values[3];
  84     xcb_window_t win = xcb_generate_id(conn);
  85
  86     mask |= XCB_CW_BACK_PIXEL;
  87     values[0] = get_colorpixel(color);
  88
  89     mask |= XCB_CW_OVERRIDE_REDIRECT;
  90     values[1] = 1;
  91
  92     mask |= XCB_CW_EVENT_MASK;
  93     values[2] = XCB_EVENT_MASK_EXPOSURE |
  94                 XCB_EVENT_MASK_KEY_PRESS |
  95                 XCB_EVENT_MASK_KEY_RELEASE |
  96                 XCB_EVENT_MASK_VISIBILITY_CHANGE;
  97
  98     xcb_create_window(conn,
  99                       24,
 100                       win, /* the window id */
 101                       scr->root, /* parent == root */
 102                       0, 0,
 103                       scr->width_in_pixels,
 104                       scr->height_in_pixels, /* dimensions */
 105                       0, /* border = 0, we draw our own */
 106                       XCB_WINDOW_CLASS_INPUT_OUTPUT,
 107                       XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
 108                       mask,
 109                       values);
 110
 111     /* Map the window (= make it visible) */
 112     xcb_map_window(conn, win);
 113
 114     /* Raise window (put it on top) */
 115     values[0] = XCB_STACK_MODE_ABOVE;
 116     xcb_configure_window(conn, win, XCB_CONFIG_WINDOW_STACK_MODE, values);
 117
 118     return win;
 119 }
 120
 121 /*
 122  * Returns the mask for Mode_switch (to be used for looking up keysymbols by
 123  * keycode).
 124  *
 125  */
 126 uint32_t get_mod_mask(xcb_connection_t *conn, xcb_key_symbols_t *symbols, uint32_t keycode) {
 127     xcb_get_modifier_mapping_reply_t *modmap_r;
 128     xcb_keycode_t *modmap, kc;
 129     xcb_keycode_t *modeswitchcodes = xcb_key_symbols_get_keycode(symbols, keycode);
 130     if (modeswitchcodes == NULL)
 131         return 0;
 132
 133     modmap_r = xcb_get_modifier_mapping_reply(conn, xcb_get_modifier_mapping(conn), NULL);
 134     modmap = xcb_get_modifier_mapping_keycodes(modmap_r);
 135
 136     for (int i = 0; i < 8; i++)
 137         for (int j = 0; j < modmap_r->keycodes_per_modifier; j++) {
 138             kc = modmap[i * modmap_r->keycodes_per_modifier + j];
 139             for (xcb_keycode_t *ktest = modeswitchcodes; *ktest; ktest++) {
 140                 if (*ktest != kc)
 141                     continue;
 142
 143                 free(modeswitchcodes);
 144                 free(modmap_r);
 145                 return (1 << i);
 146             }
 147         }
 148
 149     return 0;
 150 }
 151
 152 void dpms_turn_off_screen(xcb_connection_t *conn) {
 153     xcb_dpms_enable(conn);
 154     xcb_dpms_force_level(conn, XCB_DPMS_DPMS_MODE_OFF);
 155     xcb_flush(conn);
 156 }
 157
 158 /*
 159  * Repeatedly tries to grab pointer and keyboard (up to 1000 times).
 160  *
 161  */
 162 void grab_pointer_and_keyboard(xcb_connection_t *conn, xcb_screen_t *screen, xcb_cursor_t cursor) {
 163     xcb_grab_pointer_cookie_t pcookie;
 164     xcb_grab_pointer_reply_t *preply;
 165
 166     xcb_grab_keyboard_cookie_t kcookie;
 167     xcb_grab_keyboard_reply_t *kreply;
 168
 169     int tries = 10000;
 170
 171     while (tries-- > 0) {
 172         pcookie = xcb_grab_pointer(
 173             conn,
 174             false,               /* get all pointer events specified by the following mask */
 175             screen->root,        /* grab the root window */
 176             XCB_NONE,            /* which events to let through */
 177             XCB_GRAB_MODE_ASYNC, /* pointer events should continue as normal */
 178             XCB_GRAB_MODE_ASYNC, /* keyboard mode */
 179             XCB_NONE,            /* confine_to = in which window should the cursor stay */
 180             cursor,              /* we change the cursor to whatever the user wanted */
 181             XCB_CURRENT_TIME
 182         );
 183
 184         if ((preply = xcb_grab_pointer_reply(conn, pcookie, NULL)) &&
 185             preply->status == XCB_GRAB_STATUS_SUCCESS) {
 186             free(preply);
 187             break;
 188         }
 189
 190         /* Make this quite a bit slower */
 191         usleep(50);
 192     }
 193
 194     while (tries-- > 0) {
 195         kcookie = xcb_grab_keyboard(
 196             conn,
 197             true,                /* report events */
 198             screen->root,        /* grab the root window */
 199             XCB_CURRENT_TIME,
 200             XCB_GRAB_MODE_ASYNC, /* process events as normal, do not require sync */
 201             XCB_GRAB_MODE_ASYNC
 202         );
 203
 204         if ((kreply = xcb_grab_keyboard_reply(conn, kcookie, NULL)) &&
 205             kreply->status == XCB_GRAB_STATUS_SUCCESS) {
 206             free(kreply);
 207             break;
 208         }
 209
 210         /* Make this quite a bit slower */
 211         usleep(50);
 212     }
 213
 214     if (tries <= 0)
 215         errx(EXIT_FAILURE, "Cannot grab pointer/keyboard");
 216 }
 217
 218 xcb_cursor_t create_cursor(xcb_connection_t *conn, xcb_screen_t *screen, xcb_window_t win, int choice) {
 219     xcb_pixmap_t bitmap;
 220     xcb_pixmap_t mask;
 221     xcb_cursor_t cursor;
 222
 223     unsigned char* curs_bits;
 224     unsigned char* mask_bits;
 225     int curs_w, curs_h;
 226
 227     switch (choice) {
 228         case CURS_NONE:
 229             curs_bits = curs_invisible_bits;
 230             mask_bits = curs_invisible_bits;
 231             curs_w = curs_invisible_width;
 232             curs_h = curs_invisible_height;
 233             break;
 234         case CURS_WIN:
 235             curs_bits = curs_windows_bits;
 236             mask_bits = mask_windows_bits;
 237             curs_w = curs_windows_width;
 238             curs_h = curs_windows_height;
 239             break;
 240         case CURS_DEFAULT:
 241         default:
 242             return XCB_NONE; /* XCB_NONE is xcb's way of saying "don't change the cursor" */
 243     }
 244
 245     bitmap = xcb_create_pixmap_from_bitmap_data(conn,
 246                                                 win,
 247                                                 curs_bits,
 248                                                 curs_w,
 249                                                 curs_h,
 250                                                 1,
 251                                                 screen->white_pixel,
 252                                                 screen->black_pixel,
 253                                                 NULL);
 254
 255     mask = xcb_create_pixmap_from_bitmap_data(conn,
 256                                               win,
 257                                               mask_bits,
 258                                               curs_w,
 259                                               curs_h,
 260                                               1,
 261                                               screen->white_pixel,
 262                                               screen->black_pixel,
 263                                               NULL);
 264
 265     cursor = xcb_generate_id(conn);
 266
 267     xcb_create_cursor(conn,
 268                       cursor,
 269                       bitmap,
 270                       mask,
 271                       65535,65535,65535,
 272                       0,0,0,
 273                       0,0);
 274
 275     xcb_free_pixmap(conn, bitmap);
 276     xcb_free_pixmap(conn, mask);
 277
 278     return cursor;
 279 }