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_image.h>
  12 #include <xcb/xcb_atom.h>
  13 #include <xcb/xcb_aux.h>
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <stdbool.h>
  17 #include <string.h>
  18 #include <unistd.h>
  19 #include <assert.h>
  20 #include <err.h>
  21 #include <time.h>
  22 #include <sys/time.h>
  23
  24 #include "cursors.h"
  25 #include "unlock_indicator.h"
  26
  27 extern auth_state_t auth_state;
  28
  29 xcb_connection_t *conn;
  30 xcb_screen_t *screen;
  31
  32 #define curs_invisible_width 8
  33 #define curs_invisible_height 8
  34
  35 static unsigned char curs_invisible_bits[] = {
  36     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
  37
  38 #define curs_windows_width 11
  39 #define curs_windows_height 19
  40
  41 static unsigned char curs_windows_bits[] = {
  42     0xfe, 0x07, 0xfc, 0x07, 0xfa, 0x07, 0xf6, 0x07, 0xee, 0x07, 0xde, 0x07,
  43     0xbe, 0x07, 0x7e, 0x07, 0xfe, 0x06, 0xfe, 0x05, 0x3e, 0x00, 0xb6, 0x07,
  44     0x6a, 0x07, 0x6c, 0x07, 0xde, 0x06, 0xdf, 0x06, 0xbf, 0x05, 0xbf, 0x05,
  45     0x7f, 0x06};
  46
  47 #define mask_windows_width 11
  48 #define mask_windows_height 19
  49
  50 static unsigned char mask_windows_bits[] = {
  51     0x01, 0x00, 0x03, 0x00, 0x07, 0x00, 0x0f, 0x00, 0x1f, 0x00, 0x3f, 0x00,
  52     0x7f, 0x00, 0xff, 0x00, 0xff, 0x01, 0xff, 0x03, 0xff, 0x07, 0x7f, 0x00,
  53     0xf7, 0x00, 0xf3, 0x00, 0xe1, 0x01, 0xe0, 0x01, 0xc0, 0x03, 0xc0, 0x03,
  54     0x80, 0x01};
  55
  56 static uint32_t get_colorpixel(char *hex) {
  57     char strgroups[3][3] = {{hex[0], hex[1], '\0'},
  58                             {hex[2], hex[3], '\0'},
  59                             {hex[4], hex[5], '\0'}};
  60     uint32_t rgb16[3] = {(strtol(strgroups[0], NULL, 16)),
  61                          (strtol(strgroups[1], NULL, 16)),
  62                          (strtol(strgroups[2], NULL, 16))};
  63
  64     return (rgb16[0] << 16) + (rgb16[1] << 8) + rgb16[2];
  65 }
  66
  67 xcb_visualtype_t *get_root_visual_type(xcb_screen_t *screen) {
  68     xcb_visualtype_t *visual_type = NULL;
  69     xcb_depth_iterator_t depth_iter;
  70     xcb_visualtype_iterator_t visual_iter;
  71
  72     for (depth_iter = xcb_screen_allowed_depths_iterator(screen);
  73          depth_iter.rem;
  74          xcb_depth_next(&depth_iter)) {
  75         for (visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
  76              visual_iter.rem;
  77              xcb_visualtype_next(&visual_iter)) {
  78             if (screen->root_visual != visual_iter.data->visual_id)
  79                 continue;
  80
  81             visual_type = visual_iter.data;
  82             return visual_type;
  83         }
  84     }
  85
  86     return NULL;
  87 }
  88
  89 xcb_pixmap_t create_bg_pixmap(xcb_connection_t *conn, xcb_screen_t *scr, u_int32_t *resolution, char *color) {
  90     xcb_pixmap_t bg_pixmap = xcb_generate_id(conn);
  91     xcb_create_pixmap(conn, scr->root_depth, bg_pixmap, scr->root,
  92                       resolution[0], resolution[1]);
  93
  94     /* Generate a Graphics Context and fill the pixmap with background color
  95      * (for images that are smaller than your screen) */
  96     xcb_gcontext_t gc = xcb_generate_id(conn);
  97     uint32_t values[] = {get_colorpixel(color)};
  98     xcb_create_gc(conn, gc, bg_pixmap, XCB_GC_FOREGROUND, values);
  99     xcb_rectangle_t rect = {0, 0, resolution[0], resolution[1]};
 100     xcb_poly_fill_rectangle(conn, bg_pixmap, gc, 1, &rect);
 101     xcb_free_gc(conn, gc);
 102
 103     return bg_pixmap;
 104 }
 105
 106 xcb_window_t open_fullscreen_window(xcb_connection_t *conn, xcb_screen_t *scr, char *color, xcb_pixmap_t pixmap) {
 107     uint32_t mask = 0;
 108     uint32_t values[3];
 109     xcb_window_t win = xcb_generate_id(conn);
 110
 111     if (pixmap == XCB_NONE) {
 112         mask |= XCB_CW_BACK_PIXEL;
 113         values[0] = get_colorpixel(color);
 114     } else {
 115         mask |= XCB_CW_BACK_PIXMAP;
 116         values[0] = pixmap;
 117     }
 118
 119     mask |= XCB_CW_OVERRIDE_REDIRECT;
 120     values[1] = 1;
 121
 122     mask |= XCB_CW_EVENT_MASK;
 123     values[2] = XCB_EVENT_MASK_EXPOSURE |
 124                 XCB_EVENT_MASK_KEY_PRESS |
 125                 XCB_EVENT_MASK_KEY_RELEASE |
 126                 XCB_EVENT_MASK_VISIBILITY_CHANGE |
 127                 XCB_EVENT_MASK_STRUCTURE_NOTIFY;
 128
 129     xcb_create_window(conn,
 130                       XCB_COPY_FROM_PARENT,
 131                       win,       /* the window id */
 132                       scr->root, /* parent == root */
 133                       0, 0,
 134                       scr->width_in_pixels,
 135                       scr->height_in_pixels, /* dimensions */
 136                       0,                     /* border = 0, we draw our own */
 137                       XCB_WINDOW_CLASS_INPUT_OUTPUT,
 138                       XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
 139                       mask,
 140                       values);
 141
 142     char *name = "i3lock";
 143     xcb_change_property(conn,
 144                         XCB_PROP_MODE_REPLACE,
 145                         win,
 146                         XCB_ATOM_WM_NAME,
 147                         XCB_ATOM_STRING,
 148                         8,
 149                         strlen(name),
 150                         name);
 151
 152     /* Map the window (= make it visible) */
 153     xcb_map_window(conn, win);
 154
 155     /* Raise window (put it on top) */
 156     values[0] = XCB_STACK_MODE_ABOVE;
 157     xcb_configure_window(conn, win, XCB_CONFIG_WINDOW_STACK_MODE, values);
 158
 159     /* Ensure that the window is created and set up before returning */
 160     xcb_aux_sync(conn);
 161
 162     return win;
 163 }
 164
 165 /*
 166  * Repeatedly tries to grab pointer and keyboard (up to 10000 times).
 167  *
 168  */
 169 void grab_pointer_and_keyboard(xcb_connection_t *conn, xcb_screen_t *screen, xcb_cursor_t cursor) {
 170     xcb_grab_pointer_cookie_t pcookie;
 171     xcb_grab_pointer_reply_t *preply;
 172
 173     xcb_grab_keyboard_cookie_t kcookie;
 174     xcb_grab_keyboard_reply_t *kreply;
 175
 176     const suseconds_t screen_redraw_timeout = 100000; /* 100ms */
 177     int tries = 10000;
 178
 179     /* Using few variables to trigger a redraw_screen() if too many tries */
 180     bool redrawn = false;
 181     struct timeval start;
 182     if (gettimeofday(&start, NULL) == -1) {
 183         err(EXIT_FAILURE, "gettimeofday");
 184     }
 185
 186     while (tries-- > 0) {
 187         pcookie = xcb_grab_pointer(
 188             conn,
 189             false,               /* get all pointer events specified by the following mask */
 190             screen->root,        /* grab the root window */
 191             XCB_NONE,            /* which events to let through */
 192             XCB_GRAB_MODE_ASYNC, /* pointer events should continue as normal */
 193             XCB_GRAB_MODE_ASYNC, /* keyboard mode */
 194             XCB_NONE,            /* confine_to = in which window should the cursor stay */
 195             cursor,              /* we change the cursor to whatever the user wanted */
 196             XCB_CURRENT_TIME);
 197
 198         if ((preply = xcb_grab_pointer_reply(conn, pcookie, NULL)) &&
 199             preply->status == XCB_GRAB_STATUS_SUCCESS) {
 200             free(preply);
 201             break;
 202         }
 203
 204         /* Make this quite a bit slower */
 205         usleep(50);
 206
 207         struct timeval now;
 208         if (gettimeofday(&now, NULL) == -1) {
 209             err(EXIT_FAILURE, "gettimeofday");
 210         }
 211
 212         struct timeval elapsed;
 213         timersub(&now, &start, &elapsed);
 214
 215         if (!redrawn &&
 216             (tries % 100) == 0 &&
 217             elapsed.tv_usec >= screen_redraw_timeout) {
 218             redraw_screen();
 219             redrawn = true;
 220         }
 221     }
 222
 223     while (tries-- > 0) {
 224         kcookie = xcb_grab_keyboard(
 225             conn,
 226             true,         /* report events */
 227             screen->root, /* grab the root window */
 228             XCB_CURRENT_TIME,
 229             XCB_GRAB_MODE_ASYNC, /* process events as normal, do not require sync */
 230             XCB_GRAB_MODE_ASYNC);
 231
 232         if ((kreply = xcb_grab_keyboard_reply(conn, kcookie, NULL)) &&
 233             kreply->status == XCB_GRAB_STATUS_SUCCESS) {
 234             free(kreply);
 235             break;
 236         }
 237
 238         /* Make this quite a bit slower */
 239         usleep(50);
 240
 241         struct timeval now;
 242         if (gettimeofday(&now, NULL) == -1) {
 243             err(EXIT_FAILURE, "gettimeofday");
 244         }
 245
 246         struct timeval elapsed;
 247         timersub(&now, &start, &elapsed);
 248
 249         /* Trigger a screen redraw if 100ms elapsed */
 250         if (!redrawn &&
 251             (tries % 100) == 0 &&
 252             elapsed.tv_usec >= screen_redraw_timeout) {
 253             redraw_screen();
 254             redrawn = true;
 255         }
 256     }
 257
 258     /* After trying for 10000 times, i3lock will display an error message
 259      * for 2 sec prior to terminate. */
 260     if (tries <= 0) {
 261         auth_state = STATE_I3LOCK_LOCK_FAILED;
 262         redraw_screen();
 263         sleep(1);
 264         errx(EXIT_FAILURE, "Cannot grab pointer/keyboard");
 265     }
 266 }
 267
 268 xcb_cursor_t create_cursor(xcb_connection_t *conn, xcb_screen_t *screen, xcb_window_t win, int choice) {
 269     xcb_pixmap_t bitmap;
 270     xcb_pixmap_t mask;
 271     xcb_cursor_t cursor;
 272
 273     unsigned char *curs_bits;
 274     unsigned char *mask_bits;
 275     int curs_w, curs_h;
 276
 277     switch (choice) {
 278         case CURS_NONE:
 279             curs_bits = curs_invisible_bits;
 280             mask_bits = curs_invisible_bits;
 281             curs_w = curs_invisible_width;
 282             curs_h = curs_invisible_height;
 283             break;
 284         case CURS_WIN:
 285             curs_bits = curs_windows_bits;
 286             mask_bits = mask_windows_bits;
 287             curs_w = curs_windows_width;
 288             curs_h = curs_windows_height;
 289             break;
 290         case CURS_DEFAULT:
 291         default:
 292             return XCB_NONE; /* XCB_NONE is xcb's way of saying "don't change the cursor" */
 293     }
 294
 295     bitmap = xcb_create_pixmap_from_bitmap_data(conn,
 296                                                 win,
 297                                                 curs_bits,
 298                                                 curs_w,
 299                                                 curs_h,
 300                                                 1,
 301                                                 screen->white_pixel,
 302                                                 screen->black_pixel,
 303                                                 NULL);
 304
 305     mask = xcb_create_pixmap_from_bitmap_data(conn,
 306                                               win,
 307                                               mask_bits,
 308                                               curs_w,
 309                                               curs_h,
 310                                               1,
 311                                               screen->white_pixel,
 312                                               screen->black_pixel,
 313                                               NULL);
 314
 315     cursor = xcb_generate_id(conn);
 316
 317     xcb_create_cursor(conn,
 318                       cursor,
 319                       bitmap,
 320                       mask,
 321                       65535, 65535, 65535,
 322                       0, 0, 0,
 323                       0, 0);
 324
 325     xcb_free_pixmap(conn, bitmap);
 326     xcb_free_pixmap(conn, mask);
 327
 328     return cursor;
 329 }