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 <xcb/composite.h>
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <stdbool.h>
  18 #include <string.h>
  19 #include <unistd.h>
  20 #include <assert.h>
  21 #include <err.h>
  22 #include <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     xcb_window_t parent_win = scr->root;
 111
 112     /* Check whether the composite extension is available */
 113     const xcb_query_extension_reply_t *extension_query = NULL;
 114     xcb_generic_error_t *error = NULL;
 115     xcb_composite_get_overlay_window_cookie_t cookie;
 116     xcb_composite_get_overlay_window_reply_t *composite_reply = NULL;
 117
 118     extension_query = xcb_get_extension_data(conn, &xcb_composite_id);
 119     if (extension_query && extension_query->present) {
 120         /* When composition is used, we need to use the composite overlay
 121          * window instead of the normal root window to be able to cover
 122          * composited windows */
 123         cookie = xcb_composite_get_overlay_window(conn, scr->root);
 124         composite_reply = xcb_composite_get_overlay_window_reply(conn, cookie, &error);
 125
 126         if (!error && composite_reply) {
 127             parent_win = composite_reply->overlay_win;
 128         }
 129
 130         free(composite_reply);
 131         free(error);
 132     }
 133
 134     if (pixmap == XCB_NONE) {
 135         mask |= XCB_CW_BACK_PIXEL;
 136         values[0] = get_colorpixel(color);
 137     } else {
 138         mask |= XCB_CW_BACK_PIXMAP;
 139         values[0] = pixmap;
 140     }
 141
 142     mask |= XCB_CW_OVERRIDE_REDIRECT;
 143     values[1] = 1;
 144
 145     mask |= XCB_CW_EVENT_MASK;
 146     values[2] = XCB_EVENT_MASK_EXPOSURE |
 147                 XCB_EVENT_MASK_KEY_PRESS |
 148                 XCB_EVENT_MASK_KEY_RELEASE |
 149                 XCB_EVENT_MASK_VISIBILITY_CHANGE |
 150                 XCB_EVENT_MASK_STRUCTURE_NOTIFY;
 151
 152     xcb_create_window(conn,
 153                       XCB_COPY_FROM_PARENT,
 154                       win, /* the window id */
 155                       parent_win,
 156                       0, 0,
 157                       scr->width_in_pixels,
 158                       scr->height_in_pixels, /* dimensions */
 159                       0,                     /* border = 0, we draw our own */
 160                       XCB_WINDOW_CLASS_INPUT_OUTPUT,
 161                       XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
 162                       mask,
 163                       values);
 164
 165     char *name = "i3lock";
 166     xcb_change_property(conn,
 167                         XCB_PROP_MODE_REPLACE,
 168                         win,
 169                         XCB_ATOM_WM_NAME,
 170                         XCB_ATOM_STRING,
 171                         8,
 172                         strlen(name),
 173                         name);
 174
 175     /* Map the window (= make it visible) */
 176     xcb_map_window(conn, win);
 177
 178     /* Raise window (put it on top) */
 179     values[0] = XCB_STACK_MODE_ABOVE;
 180     xcb_configure_window(conn, win, XCB_CONFIG_WINDOW_STACK_MODE, values);
 181
 182     /* Ensure that the window is created and set up before returning */
 183     xcb_aux_sync(conn);
 184
 185     return win;
 186 }
 187
 188 /*
 189  * Repeatedly tries to grab pointer and keyboard (up to 10000 times).
 190  *
 191  */
 192 void grab_pointer_and_keyboard(xcb_connection_t *conn, xcb_screen_t *screen, xcb_cursor_t cursor) {
 193     xcb_grab_pointer_cookie_t pcookie;
 194     xcb_grab_pointer_reply_t *preply;
 195
 196     xcb_grab_keyboard_cookie_t kcookie;
 197     xcb_grab_keyboard_reply_t *kreply;
 198
 199     int tries = 10000;
 200
 201     /* Using few variables to trigger a redraw_screen() if too many tries */
 202     bool redrawn = false;
 203     time_t start = clock();
 204
 205     while (tries-- > 0) {
 206         pcookie = xcb_grab_pointer(
 207             conn,
 208             false,               /* get all pointer events specified by the following mask */
 209             screen->root,        /* grab the root window */
 210             XCB_NONE,            /* which events to let through */
 211             XCB_GRAB_MODE_ASYNC, /* pointer events should continue as normal */
 212             XCB_GRAB_MODE_ASYNC, /* keyboard mode */
 213             XCB_NONE,            /* confine_to = in which window should the cursor stay */
 214             cursor,              /* we change the cursor to whatever the user wanted */
 215             XCB_CURRENT_TIME);
 216
 217         if ((preply = xcb_grab_pointer_reply(conn, pcookie, NULL)) &&
 218             preply->status == XCB_GRAB_STATUS_SUCCESS) {
 219             free(preply);
 220             break;
 221         }
 222
 223         /* Make this quite a bit slower */
 224         usleep(50);
 225
 226         /* Measure elapsed time and trigger a screen redraw if elapsed > 250000 */
 227         if (!redrawn &&
 228             (tries % 100) == 0 &&
 229             (clock() - start) > 250000) {
 230             redraw_screen();
 231             redrawn = true;
 232         }
 233     }
 234
 235     while (tries-- > 0) {
 236         kcookie = xcb_grab_keyboard(
 237             conn,
 238             true,         /* report events */
 239             screen->root, /* grab the root window */
 240             XCB_CURRENT_TIME,
 241             XCB_GRAB_MODE_ASYNC, /* process events as normal, do not require sync */
 242             XCB_GRAB_MODE_ASYNC);
 243
 244         if ((kreply = xcb_grab_keyboard_reply(conn, kcookie, NULL)) &&
 245             kreply->status == XCB_GRAB_STATUS_SUCCESS) {
 246             free(kreply);
 247             break;
 248         }
 249
 250         /* Make this quite a bit slower */
 251         usleep(50);
 252
 253         /* Measure elapsed time and trigger a screen redraw if elapsed > 250000 */
 254         if (!redrawn &&
 255             (tries % 100) == 0 &&
 256             (clock() - start) > 250000) {
 257             redraw_screen();
 258             redrawn = true;
 259         }
 260     }
 261
 262     /* After trying for 10000 times, i3lock will display an error message
 263      * for 2 sec prior to terminate. */
 264     if (tries <= 0) {
 265         auth_state = STATE_I3LOCK_LOCK_FAILED;
 266         redraw_screen();
 267         sleep(1);
 268         errx(EXIT_FAILURE, "Cannot grab pointer/keyboard");
 269     }
 270 }
 271
 272 xcb_cursor_t create_cursor(xcb_connection_t *conn, xcb_screen_t *screen, xcb_window_t win, int choice) {
 273     xcb_pixmap_t bitmap;
 274     xcb_pixmap_t mask;
 275     xcb_cursor_t cursor;
 276
 277     unsigned char *curs_bits;
 278     unsigned char *mask_bits;
 279     int curs_w, curs_h;
 280
 281     switch (choice) {
 282         case CURS_NONE:
 283             curs_bits = curs_invisible_bits;
 284             mask_bits = curs_invisible_bits;
 285             curs_w = curs_invisible_width;
 286             curs_h = curs_invisible_height;
 287             break;
 288         case CURS_WIN:
 289             curs_bits = curs_windows_bits;
 290             mask_bits = mask_windows_bits;
 291             curs_w = curs_windows_width;
 292             curs_h = curs_windows_height;
 293             break;
 294         case CURS_DEFAULT:
 295         default:
 296             return XCB_NONE; /* XCB_NONE is xcb's way of saying "don't change the cursor" */
 297     }
 298
 299     bitmap = xcb_create_pixmap_from_bitmap_data(conn,
 300                                                 win,
 301                                                 curs_bits,
 302                                                 curs_w,
 303                                                 curs_h,
 304                                                 1,
 305                                                 screen->white_pixel,
 306                                                 screen->black_pixel,
 307                                                 NULL);
 308
 309     mask = xcb_create_pixmap_from_bitmap_data(conn,
 310                                               win,
 311                                               mask_bits,
 312                                               curs_w,
 313                                               curs_h,
 314                                               1,
 315                                               screen->white_pixel,
 316                                               screen->black_pixel,
 317                                               NULL);
 318
 319     cursor = xcb_generate_id(conn);
 320
 321     xcb_create_cursor(conn,
 322                       cursor,
 323                       bitmap,
 324                       mask,
 325                       65535, 65535, 65535,
 326                       0, 0, 0,
 327                       0, 0);
 328
 329     xcb_free_pixmap(conn, bitmap);
 330     xcb_free_pixmap(conn, mask);
 331
 332     return cursor;
 333 }