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
  23 #include "cursors.h"
  24 #include "unlock_indicator.h"
  25
  26 extern auth_state_t auth_state;
  27
  28 xcb_connection_t *conn;
  29 xcb_screen_t *screen;
  30
  31 #define curs_invisible_width 8
  32 #define curs_invisible_height 8
  33
  34 static unsigned char curs_invisible_bits[] = {
  35     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
  36
  37 #define curs_windows_width 11
  38 #define curs_windows_height 19
  39
  40 static unsigned char curs_windows_bits[] = {
  41     0xfe, 0x07, 0xfc, 0x07, 0xfa, 0x07, 0xf6, 0x07, 0xee, 0x07, 0xde, 0x07,
  42     0xbe, 0x07, 0x7e, 0x07, 0xfe, 0x06, 0xfe, 0x05, 0x3e, 0x00, 0xb6, 0x07,
  43     0x6a, 0x07, 0x6c, 0x07, 0xde, 0x06, 0xdf, 0x06, 0xbf, 0x05, 0xbf, 0x05,
  44     0x7f, 0x06};
  45
  46 #define mask_windows_width 11
  47 #define mask_windows_height 19
  48
  49 static unsigned char mask_windows_bits[] = {
  50     0x01, 0x00, 0x03, 0x00, 0x07, 0x00, 0x0f, 0x00, 0x1f, 0x00, 0x3f, 0x00,
  51     0x7f, 0x00, 0xff, 0x00, 0xff, 0x01, 0xff, 0x03, 0xff, 0x07, 0x7f, 0x00,
  52     0xf7, 0x00, 0xf3, 0x00, 0xe1, 0x01, 0xe0, 0x01, 0xc0, 0x03, 0xc0, 0x03,
  53     0x80, 0x01};
  54
  55 static uint32_t get_colorpixel(char *hex) {
  56     char strgroups[3][3] = {{hex[0], hex[1], '\0'},
  57                             {hex[2], hex[3], '\0'},
  58                             {hex[4], hex[5], '\0'}};
  59     uint32_t rgb16[3] = {(strtol(strgroups[0], NULL, 16)),
  60                          (strtol(strgroups[1], NULL, 16)),
  61                          (strtol(strgroups[2], NULL, 16))};
  62
  63     return (rgb16[0] << 16) + (rgb16[1] << 8) + rgb16[2];
  64 }
  65
  66 xcb_visualtype_t *get_root_visual_type(xcb_screen_t *screen) {
  67     xcb_visualtype_t *visual_type = NULL;
  68     xcb_depth_iterator_t depth_iter;
  69     xcb_visualtype_iterator_t visual_iter;
  70
  71     for (depth_iter = xcb_screen_allowed_depths_iterator(screen);
  72          depth_iter.rem;
  73          xcb_depth_next(&depth_iter)) {
  74         for (visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
  75              visual_iter.rem;
  76              xcb_visualtype_next(&visual_iter)) {
  77             if (screen->root_visual != visual_iter.data->visual_id)
  78                 continue;
  79
  80             visual_type = visual_iter.data;
  81             return visual_type;
  82         }
  83     }
  84
  85     return NULL;
  86 }
  87
  88 xcb_pixmap_t create_bg_pixmap(xcb_connection_t *conn, xcb_screen_t *scr, u_int32_t *resolution, char *color) {
  89     xcb_pixmap_t bg_pixmap = xcb_generate_id(conn);
  90     xcb_create_pixmap(conn, scr->root_depth, bg_pixmap, scr->root,
  91                       resolution[0], resolution[1]);
  92
  93     /* Generate a Graphics Context and fill the pixmap with background color
  94      * (for images that are smaller than your screen) */
  95     xcb_gcontext_t gc = xcb_generate_id(conn);
  96     uint32_t values[] = {get_colorpixel(color)};
  97     xcb_create_gc(conn, gc, bg_pixmap, XCB_GC_FOREGROUND, values);
  98     xcb_rectangle_t rect = {0, 0, resolution[0], resolution[1]};
  99     xcb_poly_fill_rectangle(conn, bg_pixmap, gc, 1, &rect);
 100     xcb_free_gc(conn, gc);
 101
 102     return bg_pixmap;
 103 }
 104
 105 xcb_window_t open_fullscreen_window(xcb_connection_t *conn, xcb_screen_t *scr, char *color, xcb_pixmap_t pixmap) {
 106     uint32_t mask = 0;
 107     uint32_t values[3];
 108     xcb_window_t win = xcb_generate_id(conn);
 109
 110     if (pixmap == XCB_NONE) {
 111         mask |= XCB_CW_BACK_PIXEL;
 112         values[0] = get_colorpixel(color);
 113     } else {
 114         mask |= XCB_CW_BACK_PIXMAP;
 115         values[0] = pixmap;
 116     }
 117
 118     mask |= XCB_CW_OVERRIDE_REDIRECT;
 119     values[1] = 1;
 120
 121     mask |= XCB_CW_EVENT_MASK;
 122     values[2] = XCB_EVENT_MASK_EXPOSURE |
 123                 XCB_EVENT_MASK_KEY_PRESS |
 124                 XCB_EVENT_MASK_KEY_RELEASE |
 125                 XCB_EVENT_MASK_VISIBILITY_CHANGE |
 126                 XCB_EVENT_MASK_STRUCTURE_NOTIFY;
 127
 128     xcb_create_window(conn,
 129                       XCB_COPY_FROM_PARENT,
 130                       win,       /* the window id */
 131                       scr->root, /* parent == root */
 132                       0, 0,
 133                       scr->width_in_pixels,
 134                       scr->height_in_pixels, /* dimensions */
 135                       0,                     /* border = 0, we draw our own */
 136                       XCB_WINDOW_CLASS_INPUT_OUTPUT,
 137                       XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
 138                       mask,
 139                       values);
 140
 141     char *name = "i3lock";
 142     xcb_change_property(conn,
 143                         XCB_PROP_MODE_REPLACE,
 144                         win,
 145                         XCB_ATOM_WM_NAME,
 146                         XCB_ATOM_STRING,
 147                         8,
 148                         strlen(name),
 149                         name);
 150
 151     /* Map the window (= make it visible) */
 152     xcb_map_window(conn, win);
 153
 154     /* Raise window (put it on top) */
 155     values[0] = XCB_STACK_MODE_ABOVE;
 156     xcb_configure_window(conn, win, XCB_CONFIG_WINDOW_STACK_MODE, values);
 157
 158     /* Ensure that the window is created and set up before returning */
 159     xcb_aux_sync(conn);
 160
 161     return win;
 162 }
 163
 164 /*
 165  * Repeatedly tries to grab pointer and keyboard (up to 10000 times).
 166  *
 167  */
 168 void grab_pointer_and_keyboard(xcb_connection_t *conn, xcb_screen_t *screen, xcb_cursor_t cursor) {
 169     xcb_grab_pointer_cookie_t pcookie;
 170     xcb_grab_pointer_reply_t *preply;
 171
 172     xcb_grab_keyboard_cookie_t kcookie;
 173     xcb_grab_keyboard_reply_t *kreply;
 174
 175     int tries = 10000;
 176
 177     /* Using few variables to trigger a redraw_screen() if too many tries */
 178     bool redrawn = false;
 179     time_t start = clock();
 180
 181     while (tries-- > 0) {
 182         pcookie = xcb_grab_pointer(
 183             conn,
 184             false,               /* get all pointer events specified by the following mask */
 185             screen->root,        /* grab the root window */
 186             XCB_NONE,            /* which events to let through */
 187             XCB_GRAB_MODE_ASYNC, /* pointer events should continue as normal */
 188             XCB_GRAB_MODE_ASYNC, /* keyboard mode */
 189             XCB_NONE,            /* confine_to = in which window should the cursor stay */
 190             cursor,              /* we change the cursor to whatever the user wanted */
 191             XCB_CURRENT_TIME);
 192
 193         if ((preply = xcb_grab_pointer_reply(conn, pcookie, NULL)) &&
 194             preply->status == XCB_GRAB_STATUS_SUCCESS) {
 195             free(preply);
 196             break;
 197         }
 198
 199         /* Make this quite a bit slower */
 200         usleep(50);
 201
 202         /* Measure elapsed time and trigger a screen redraw if elapsed > 250000 */
 203         if (!redrawn &&
 204             (tries % 100) == 0 &&
 205             (clock() - start) > 250000) {
 206             redraw_screen();
 207             redrawn = true;
 208         }
 209     }
 210
 211     while (tries-- > 0) {
 212         kcookie = xcb_grab_keyboard(
 213             conn,
 214             true,         /* report events */
 215             screen->root, /* grab the root window */
 216             XCB_CURRENT_TIME,
 217             XCB_GRAB_MODE_ASYNC, /* process events as normal, do not require sync */
 218             XCB_GRAB_MODE_ASYNC);
 219
 220         if ((kreply = xcb_grab_keyboard_reply(conn, kcookie, NULL)) &&
 221             kreply->status == XCB_GRAB_STATUS_SUCCESS) {
 222             free(kreply);
 223             break;
 224         }
 225
 226         /* Make this quite a bit slower */
 227         usleep(50);
 228
 229         /* Measure elapsed time and trigger a screen redraw if elapsed > 250000 */
 230         if (!redrawn &&
 231             (tries % 100) == 0 &&
 232             (clock() - start) > 250000) {
 233             redraw_screen();
 234             redrawn = true;
 235         }
 236     }
 237
 238     /* After trying for 10000 times, i3lock will display an error message
 239      * for 2 sec prior to terminate. */
 240     if (tries <= 0) {
 241         auth_state = STATE_I3LOCK_LOCK_FAILED;
 242         redraw_screen();
 243         sleep(1);
 244         errx(EXIT_FAILURE, "Cannot grab pointer/keyboard");
 245     }
 246 }
 247
 248 xcb_cursor_t create_cursor(xcb_connection_t *conn, xcb_screen_t *screen, xcb_window_t win, int choice) {
 249     xcb_pixmap_t bitmap;
 250     xcb_pixmap_t mask;
 251     xcb_cursor_t cursor;
 252
 253     unsigned char *curs_bits;
 254     unsigned char *mask_bits;
 255     int curs_w, curs_h;
 256
 257     switch (choice) {
 258         case CURS_NONE:
 259             curs_bits = curs_invisible_bits;
 260             mask_bits = curs_invisible_bits;
 261             curs_w = curs_invisible_width;
 262             curs_h = curs_invisible_height;
 263             break;
 264         case CURS_WIN:
 265             curs_bits = curs_windows_bits;
 266             mask_bits = mask_windows_bits;
 267             curs_w = curs_windows_width;
 268             curs_h = curs_windows_height;
 269             break;
 270         case CURS_DEFAULT:
 271         default:
 272             return XCB_NONE; /* XCB_NONE is xcb's way of saying "don't change the cursor" */
 273     }
 274
 275     bitmap = xcb_create_pixmap_from_bitmap_data(conn,
 276                                                 win,
 277                                                 curs_bits,
 278                                                 curs_w,
 279                                                 curs_h,
 280                                                 1,
 281                                                 screen->white_pixel,
 282                                                 screen->black_pixel,
 283                                                 NULL);
 284
 285     mask = xcb_create_pixmap_from_bitmap_data(conn,
 286                                               win,
 287                                               mask_bits,
 288                                               curs_w,
 289                                               curs_h,
 290                                               1,
 291                                               screen->white_pixel,
 292                                               screen->black_pixel,
 293                                               NULL);
 294
 295     cursor = xcb_generate_id(conn);
 296
 297     xcb_create_cursor(conn,
 298                       cursor,
 299                       bitmap,
 300                       mask,
 301                       65535, 65535, 65535,
 302                       0, 0, 0,
 303                       0, 0);
 304
 305     xcb_free_pixmap(conn, bitmap);
 306     xcb_free_pixmap(conn, mask);
 307
 308     return cursor;
 309 }