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
  22 #include "cursors.h"
  23
  24 xcb_connection_t *conn;
  25 xcb_screen_t *screen;
  26
  27 #define curs_invisible_width 8
  28 #define curs_invisible_height 8
  29
  30 static unsigned char curs_invisible_bits[] = {
  31     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
  32
  33 #define curs_windows_width 11
  34 #define curs_windows_height 19
  35
  36 static unsigned char curs_windows_bits[] = {
  37     0xfe, 0x07, 0xfc, 0x07, 0xfa, 0x07, 0xf6, 0x07, 0xee, 0x07, 0xde, 0x07,
  38     0xbe, 0x07, 0x7e, 0x07, 0xfe, 0x06, 0xfe, 0x05, 0x3e, 0x00, 0xb6, 0x07,
  39     0x6a, 0x07, 0x6c, 0x07, 0xde, 0x06, 0xdf, 0x06, 0xbf, 0x05, 0xbf, 0x05,
  40     0x7f, 0x06};
  41
  42 #define mask_windows_width 11
  43 #define mask_windows_height 19
  44
  45 static unsigned char mask_windows_bits[] = {
  46     0x01, 0x00, 0x03, 0x00, 0x07, 0x00, 0x0f, 0x00, 0x1f, 0x00, 0x3f, 0x00,
  47     0x7f, 0x00, 0xff, 0x00, 0xff, 0x01, 0xff, 0x03, 0xff, 0x07, 0x7f, 0x00,
  48     0xf7, 0x00, 0xf3, 0x00, 0xe1, 0x01, 0xe0, 0x01, 0xc0, 0x03, 0xc0, 0x03,
  49     0x80, 0x01};
  50
  51 static uint32_t get_colorpixel(char *hex) {
  52     char strgroups[3][3] = {{hex[0], hex[1], '\0'},
  53                             {hex[2], hex[3], '\0'},
  54                             {hex[4], hex[5], '\0'}};
  55     uint32_t rgb16[3] = {(strtol(strgroups[0], NULL, 16)),
  56                          (strtol(strgroups[1], NULL, 16)),
  57                          (strtol(strgroups[2], NULL, 16))};
  58
  59     return (rgb16[0] << 16) + (rgb16[1] << 8) + rgb16[2];
  60 }
  61
  62 xcb_visualtype_t *get_root_visual_type(xcb_screen_t *screen) {
  63     xcb_visualtype_t *visual_type = NULL;
  64     xcb_depth_iterator_t depth_iter;
  65     xcb_visualtype_iterator_t visual_iter;
  66
  67     for (depth_iter = xcb_screen_allowed_depths_iterator(screen);
  68          depth_iter.rem;
  69          xcb_depth_next(&depth_iter)) {
  70         for (visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
  71              visual_iter.rem;
  72              xcb_visualtype_next(&visual_iter)) {
  73             if (screen->root_visual != visual_iter.data->visual_id)
  74                 continue;
  75
  76             visual_type = visual_iter.data;
  77             return visual_type;
  78         }
  79     }
  80
  81     return NULL;
  82 }
  83
  84 xcb_pixmap_t create_bg_pixmap(xcb_connection_t *conn, xcb_screen_t *scr, u_int32_t *resolution, char *color) {
  85     xcb_pixmap_t bg_pixmap = xcb_generate_id(conn);
  86     xcb_create_pixmap(conn, scr->root_depth, bg_pixmap, scr->root,
  87                       resolution[0], resolution[1]);
  88
  89     /* Generate a Graphics Context and fill the pixmap with background color
  90      * (for images that are smaller than your screen) */
  91     xcb_gcontext_t gc = xcb_generate_id(conn);
  92     uint32_t values[] = {get_colorpixel(color)};
  93     xcb_create_gc(conn, gc, bg_pixmap, XCB_GC_FOREGROUND, values);
  94     xcb_rectangle_t rect = {0, 0, resolution[0], resolution[1]};
  95     xcb_poly_fill_rectangle(conn, bg_pixmap, gc, 1, &rect);
  96     xcb_free_gc(conn, gc);
  97
  98     return bg_pixmap;
  99 }
 100
 101 xcb_window_t open_fullscreen_window(xcb_connection_t *conn, xcb_screen_t *scr, char *color, xcb_pixmap_t pixmap) {
 102     uint32_t mask = 0;
 103     uint32_t values[3];
 104     xcb_window_t win = xcb_generate_id(conn);
 105
 106     if (pixmap == XCB_NONE) {
 107         mask |= XCB_CW_BACK_PIXEL;
 108         values[0] = get_colorpixel(color);
 109     } else {
 110         mask |= XCB_CW_BACK_PIXMAP;
 111         values[0] = pixmap;
 112     }
 113
 114     mask |= XCB_CW_OVERRIDE_REDIRECT;
 115     values[1] = 1;
 116
 117     mask |= XCB_CW_EVENT_MASK;
 118     values[2] = XCB_EVENT_MASK_EXPOSURE |
 119                 XCB_EVENT_MASK_KEY_PRESS |
 120                 XCB_EVENT_MASK_KEY_RELEASE |
 121                 XCB_EVENT_MASK_VISIBILITY_CHANGE |
 122                 XCB_EVENT_MASK_STRUCTURE_NOTIFY;
 123
 124     xcb_create_window(conn,
 125                       XCB_COPY_FROM_PARENT,
 126                       win,       /* the window id */
 127                       scr->root, /* parent == root */
 128                       0, 0,
 129                       scr->width_in_pixels,
 130                       scr->height_in_pixels, /* dimensions */
 131                       0,                     /* border = 0, we draw our own */
 132                       XCB_WINDOW_CLASS_INPUT_OUTPUT,
 133                       XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
 134                       mask,
 135                       values);
 136
 137     char *name = "i3lock";
 138     xcb_change_property(conn,
 139                         XCB_PROP_MODE_REPLACE,
 140                         win,
 141                         XCB_ATOM_WM_NAME,
 142                         XCB_ATOM_STRING,
 143                         8,
 144                         strlen(name),
 145                         name);
 146
 147     /* Map the window (= make it visible) */
 148     xcb_map_window(conn, win);
 149
 150     /* Raise window (put it on top) */
 151     values[0] = XCB_STACK_MODE_ABOVE;
 152     xcb_configure_window(conn, win, XCB_CONFIG_WINDOW_STACK_MODE, values);
 153
 154     /* Ensure that the window is created and set up before returning */
 155     xcb_aux_sync(conn);
 156
 157     return win;
 158 }
 159
 160 /*
 161  * Repeatedly tries to grab pointer and keyboard (up to 1000 times).
 162  *
 163  */
 164 void grab_pointer_and_keyboard(xcb_connection_t *conn, xcb_screen_t *screen, xcb_cursor_t cursor) {
 165     xcb_grab_pointer_cookie_t pcookie;
 166     xcb_grab_pointer_reply_t *preply;
 167
 168     xcb_grab_keyboard_cookie_t kcookie;
 169     xcb_grab_keyboard_reply_t *kreply;
 170
 171     int tries = 10000;
 172
 173     while (tries-- > 0) {
 174         pcookie = xcb_grab_pointer(
 175             conn,
 176             false,               /* get all pointer events specified by the following mask */
 177             screen->root,        /* grab the root window */
 178             XCB_NONE,            /* which events to let through */
 179             XCB_GRAB_MODE_ASYNC, /* pointer events should continue as normal */
 180             XCB_GRAB_MODE_ASYNC, /* keyboard mode */
 181             XCB_NONE,            /* confine_to = in which window should the cursor stay */
 182             cursor,              /* we change the cursor to whatever the user wanted */
 183             XCB_CURRENT_TIME);
 184
 185         if ((preply = xcb_grab_pointer_reply(conn, pcookie, NULL)) &&
 186             preply->status == XCB_GRAB_STATUS_SUCCESS) {
 187             free(preply);
 188             break;
 189         }
 190
 191         /* Make this quite a bit slower */
 192         usleep(50);
 193     }
 194
 195     while (tries-- > 0) {
 196         kcookie = xcb_grab_keyboard(
 197             conn,
 198             true,         /* report events */
 199             screen->root, /* grab the root window */
 200             XCB_CURRENT_TIME,
 201             XCB_GRAB_MODE_ASYNC, /* process events as normal, do not require sync */
 202             XCB_GRAB_MODE_ASYNC);
 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 }