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 xcb_connection_t *conn;
  27 xcb_screen_t *screen;
  28
  29 #define curs_invisible_width 8
  30 #define curs_invisible_height 8
  31
  32 static unsigned char curs_invisible_bits[] = {
  33     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
  34
  35 #define curs_windows_width 11
  36 #define curs_windows_height 19
  37
  38 static unsigned char curs_windows_bits[] = {
  39     0xfe, 0x07, 0xfc, 0x07, 0xfa, 0x07, 0xf6, 0x07, 0xee, 0x07, 0xde, 0x07,
  40     0xbe, 0x07, 0x7e, 0x07, 0xfe, 0x06, 0xfe, 0x05, 0x3e, 0x00, 0xb6, 0x07,
  41     0x6a, 0x07, 0x6c, 0x07, 0xde, 0x06, 0xdf, 0x06, 0xbf, 0x05, 0xbf, 0x05,
  42     0x7f, 0x06};
  43
  44 #define mask_windows_width 11
  45 #define mask_windows_height 19
  46
  47 static unsigned char mask_windows_bits[] = {
  48     0x01, 0x00, 0x03, 0x00, 0x07, 0x00, 0x0f, 0x00, 0x1f, 0x00, 0x3f, 0x00,
  49     0x7f, 0x00, 0xff, 0x00, 0xff, 0x01, 0xff, 0x03, 0xff, 0x07, 0x7f, 0x00,
  50     0xf7, 0x00, 0xf3, 0x00, 0xe1, 0x01, 0xe0, 0x01, 0xc0, 0x03, 0xc0, 0x03,
  51     0x80, 0x01};
  52
  53 static uint32_t get_colorpixel(char *hex) {
  54     char strgroups[3][3] = {{hex[0], hex[1], '\0'},
  55                             {hex[2], hex[3], '\0'},
  56                             {hex[4], hex[5], '\0'}};
  57     uint32_t rgb16[3] = {(strtol(strgroups[0], NULL, 16)),
  58                          (strtol(strgroups[1], NULL, 16)),
  59                          (strtol(strgroups[2], NULL, 16))};
  60
  61     return (rgb16[0] << 16) + (rgb16[1] << 8) + rgb16[2];
  62 }
  63
  64 xcb_visualtype_t *get_root_visual_type(xcb_screen_t *screen) {
  65     xcb_visualtype_t *visual_type = NULL;
  66     xcb_depth_iterator_t depth_iter;
  67     xcb_visualtype_iterator_t visual_iter;
  68
  69     for (depth_iter = xcb_screen_allowed_depths_iterator(screen);
  70          depth_iter.rem;
  71          xcb_depth_next(&depth_iter)) {
  72         for (visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
  73              visual_iter.rem;
  74              xcb_visualtype_next(&visual_iter)) {
  75             if (screen->root_visual != visual_iter.data->visual_id)
  76                 continue;
  77
  78             visual_type = visual_iter.data;
  79             return visual_type;
  80         }
  81     }
  82
  83     return NULL;
  84 }
  85
  86 xcb_pixmap_t create_bg_pixmap(xcb_connection_t *conn, xcb_screen_t *scr, u_int32_t *resolution, char *color) {
  87     xcb_pixmap_t bg_pixmap = xcb_generate_id(conn);
  88     xcb_create_pixmap(conn, scr->root_depth, bg_pixmap, scr->root,
  89                       resolution[0], resolution[1]);
  90
  91     /* Generate a Graphics Context and fill the pixmap with background color
  92      * (for images that are smaller than your screen) */
  93     xcb_gcontext_t gc = xcb_generate_id(conn);
  94     uint32_t values[] = {get_colorpixel(color)};
  95     xcb_create_gc(conn, gc, bg_pixmap, XCB_GC_FOREGROUND, values);
  96     xcb_rectangle_t rect = {0, 0, resolution[0], resolution[1]};
  97     xcb_poly_fill_rectangle(conn, bg_pixmap, gc, 1, &rect);
  98     xcb_free_gc(conn, gc);
  99
 100     return bg_pixmap;
 101 }
 102
 103 xcb_window_t open_fullscreen_window(xcb_connection_t *conn, xcb_screen_t *scr, char *color, xcb_pixmap_t pixmap) {
 104     uint32_t mask = 0;
 105     uint32_t values[3];
 106     xcb_window_t win = xcb_generate_id(conn);
 107
 108     if (pixmap == XCB_NONE) {
 109         mask |= XCB_CW_BACK_PIXEL;
 110         values[0] = get_colorpixel(color);
 111     } else {
 112         mask |= XCB_CW_BACK_PIXMAP;
 113         values[0] = pixmap;
 114     }
 115
 116     mask |= XCB_CW_OVERRIDE_REDIRECT;
 117     values[1] = 1;
 118
 119     mask |= XCB_CW_EVENT_MASK;
 120     values[2] = XCB_EVENT_MASK_EXPOSURE |
 121                 XCB_EVENT_MASK_KEY_PRESS |
 122                 XCB_EVENT_MASK_KEY_RELEASE |
 123                 XCB_EVENT_MASK_VISIBILITY_CHANGE |
 124                 XCB_EVENT_MASK_STRUCTURE_NOTIFY;
 125
 126     xcb_create_window(conn,
 127                       XCB_COPY_FROM_PARENT,
 128                       win,       /* the window id */
 129                       scr->root, /* parent == root */
 130                       0, 0,
 131                       scr->width_in_pixels,
 132                       scr->height_in_pixels, /* dimensions */
 133                       0,                     /* border = 0, we draw our own */
 134                       XCB_WINDOW_CLASS_INPUT_OUTPUT,
 135                       XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
 136                       mask,
 137                       values);
 138
 139     char *name = "i3lock";
 140     xcb_change_property(conn,
 141                         XCB_PROP_MODE_REPLACE,
 142                         win,
 143                         XCB_ATOM_WM_NAME,
 144                         XCB_ATOM_STRING,
 145                         8,
 146                         strlen(name),
 147                         name);
 148
 149     /* Map the window (= make it visible) */
 150     xcb_map_window(conn, win);
 151
 152     /* Raise window (put it on top) */
 153     values[0] = XCB_STACK_MODE_ABOVE;
 154     xcb_configure_window(conn, win, XCB_CONFIG_WINDOW_STACK_MODE, values);
 155
 156     /* Ensure that the window is created and set up before returning */
 157     xcb_aux_sync(conn);
 158
 159     return win;
 160 }
 161
 162 /*
 163  * Repeatedly tries to grab pointer and keyboard (up to 1000 times).
 164  *
 165  */
 166 void grab_pointer_and_keyboard(xcb_connection_t *conn, xcb_screen_t *screen, xcb_cursor_t cursor) {
 167     xcb_grab_pointer_cookie_t pcookie;
 168     xcb_grab_pointer_reply_t *preply;
 169
 170     xcb_grab_keyboard_cookie_t kcookie;
 171     xcb_grab_keyboard_reply_t *kreply;
 172
 173     int tries = 10000;
 174
 175     /* Using few variables to trigger a redraw_screen() if too many tries */
 176     bool redrawn = false;
 177     time_t start = clock();
 178
 179     while (tries-- > 0) {
 180         pcookie = xcb_grab_pointer(
 181             conn,
 182             false,               /* get all pointer events specified by the following mask */
 183             screen->root,        /* grab the root window */
 184             XCB_NONE,            /* which events to let through */
 185             XCB_GRAB_MODE_ASYNC, /* pointer events should continue as normal */
 186             XCB_GRAB_MODE_ASYNC, /* keyboard mode */
 187             XCB_NONE,            /* confine_to = in which window should the cursor stay */
 188             cursor,              /* we change the cursor to whatever the user wanted */
 189             XCB_CURRENT_TIME);
 190
 191         if ((preply = xcb_grab_pointer_reply(conn, pcookie, NULL)) &&
 192             preply->status == XCB_GRAB_STATUS_SUCCESS) {
 193             free(preply);
 194             break;
 195         }
 196
 197         /* Make this quite a bit slower */
 198         usleep(50);
 199
 200         /* Measure elapsed time and trigger a screen redraw if elapsed > 250000 */
 201         if (!redrawn &&
 202             (tries % 100) == 0 &&
 203             (clock() - start) > 250000) {
 204             redraw_screen();
 205             redrawn = true;
 206         }
 207     }
 208
 209     while (tries-- > 0) {
 210         kcookie = xcb_grab_keyboard(
 211             conn,
 212             true,         /* report events */
 213             screen->root, /* grab the root window */
 214             XCB_CURRENT_TIME,
 215             XCB_GRAB_MODE_ASYNC, /* process events as normal, do not require sync */
 216             XCB_GRAB_MODE_ASYNC);
 217
 218         if ((kreply = xcb_grab_keyboard_reply(conn, kcookie, NULL)) &&
 219             kreply->status == XCB_GRAB_STATUS_SUCCESS) {
 220             free(kreply);
 221             break;
 222         }
 223
 224         /* Make this quite a bit slower */
 225         usleep(50);
 226
 227         /* Measure elapsed time and trigger a screen redraw if elapsed > 250000 */
 228         if (!redrawn &&
 229             (tries % 100) == 0 &&
 230             (clock() - start) > 250000) {
 231             redraw_screen();
 232             redrawn = true;
 233         }
 234     }
 235
 236     if (tries <= 0)
 237         errx(EXIT_FAILURE, "Cannot grab pointer/keyboard");
 238 }
 239
 240 xcb_cursor_t create_cursor(xcb_connection_t *conn, xcb_screen_t *screen, xcb_window_t win, int choice) {
 241     xcb_pixmap_t bitmap;
 242     xcb_pixmap_t mask;
 243     xcb_cursor_t cursor;
 244
 245     unsigned char *curs_bits;
 246     unsigned char *mask_bits;
 247     int curs_w, curs_h;
 248
 249     switch (choice) {
 250         case CURS_NONE:
 251             curs_bits = curs_invisible_bits;
 252             mask_bits = curs_invisible_bits;
 253             curs_w = curs_invisible_width;
 254             curs_h = curs_invisible_height;
 255             break;
 256         case CURS_WIN:
 257             curs_bits = curs_windows_bits;
 258             mask_bits = mask_windows_bits;
 259             curs_w = curs_windows_width;
 260             curs_h = curs_windows_height;
 261             break;
 262         case CURS_DEFAULT:
 263         default:
 264             return XCB_NONE; /* XCB_NONE is xcb's way of saying "don't change the cursor" */
 265     }
 266
 267     bitmap = xcb_create_pixmap_from_bitmap_data(conn,
 268                                                 win,
 269                                                 curs_bits,
 270                                                 curs_w,
 271                                                 curs_h,
 272                                                 1,
 273                                                 screen->white_pixel,
 274                                                 screen->black_pixel,
 275                                                 NULL);
 276
 277     mask = xcb_create_pixmap_from_bitmap_data(conn,
 278                                               win,
 279                                               mask_bits,
 280                                               curs_w,
 281                                               curs_h,
 282                                               1,
 283                                               screen->white_pixel,
 284                                               screen->black_pixel,
 285                                               NULL);
 286
 287     cursor = xcb_generate_id(conn);
 288
 289     xcb_create_cursor(conn,
 290                       cursor,
 291                       bitmap,
 292                       mask,
 293                       65535, 65535, 65535,
 294                       0, 0, 0,
 295                       0, 0);
 296
 297     xcb_free_pixmap(conn, bitmap);
 298     xcb_free_pixmap(conn, mask);
 299
 300     return cursor;
 301 }