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 <stdio.h>
  14 #include <stdlib.h>
  15 #include <stdbool.h>
  16 #include <string.h>
  17 #include <unistd.h>
  18 #include <assert.h>
  19 #include <err.h>
  20
  21 #include "cursors.h"
  22
  23 xcb_connection_t *conn;
  24 xcb_screen_t *screen;
  25
  26 #define curs_invisible_width 8
  27 #define curs_invisible_height 8
  28
  29 static unsigned char curs_invisible_bits[] = {
  30     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
  31
  32 #define curs_windows_width 11
  33 #define curs_windows_height 19
  34
  35 static unsigned char curs_windows_bits[] = {
  36     0xfe, 0x07, 0xfc, 0x07, 0xfa, 0x07, 0xf6, 0x07, 0xee, 0x07, 0xde, 0x07,
  37     0xbe, 0x07, 0x7e, 0x07, 0xfe, 0x06, 0xfe, 0x05, 0x3e, 0x00, 0xb6, 0x07,
  38     0x6a, 0x07, 0x6c, 0x07, 0xde, 0x06, 0xdf, 0x06, 0xbf, 0x05, 0xbf, 0x05,
  39     0x7f, 0x06};
  40
  41 #define mask_windows_width 11
  42 #define mask_windows_height 19
  43
  44 static unsigned char mask_windows_bits[] = {
  45     0x01, 0x00, 0x03, 0x00, 0x07, 0x00, 0x0f, 0x00, 0x1f, 0x00, 0x3f, 0x00,
  46     0x7f, 0x00, 0xff, 0x00, 0xff, 0x01, 0xff, 0x03, 0xff, 0x07, 0x7f, 0x00,
  47     0xf7, 0x00, 0xf3, 0x00, 0xe1, 0x01, 0xe0, 0x01, 0xc0, 0x03, 0xc0, 0x03,
  48     0x80, 0x01};
  49
  50 static uint32_t get_colorpixel(char *hex) {
  51     char strgroups[3][3] = {{hex[0], hex[1], '\0'},
  52                             {hex[2], hex[3], '\0'},
  53                             {hex[4], hex[5], '\0'}};
  54     uint32_t rgb16[3] = {(strtol(strgroups[0], NULL, 16)),
  55                          (strtol(strgroups[1], NULL, 16)),
  56                          (strtol(strgroups[2], NULL, 16))};
  57
  58     return (rgb16[0] << 16) + (rgb16[1] << 8) + rgb16[2];
  59 }
  60
  61 xcb_visualtype_t *get_root_visual_type(xcb_screen_t *screen) {
  62     xcb_visualtype_t *visual_type = NULL;
  63     xcb_depth_iterator_t depth_iter;
  64     xcb_visualtype_iterator_t visual_iter;
  65
  66     for (depth_iter = xcb_screen_allowed_depths_iterator(screen);
  67          depth_iter.rem;
  68          xcb_depth_next(&depth_iter)) {
  69         for (visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
  70              visual_iter.rem;
  71              xcb_visualtype_next(&visual_iter)) {
  72             if (screen->root_visual != visual_iter.data->visual_id)
  73                 continue;
  74
  75             visual_type = visual_iter.data;
  76             return visual_type;
  77         }
  78     }
  79
  80     return NULL;
  81 }
  82
  83 xcb_pixmap_t create_bg_pixmap(xcb_connection_t *conn, xcb_screen_t *scr, u_int32_t *resolution, char *color) {
  84     xcb_pixmap_t bg_pixmap = xcb_generate_id(conn);
  85     xcb_create_pixmap(conn, scr->root_depth, bg_pixmap, scr->root,
  86                       resolution[0], resolution[1]);
  87
  88     /* Generate a Graphics Context and fill the pixmap with background color
  89      * (for images that are smaller than your screen) */
  90     xcb_gcontext_t gc = xcb_generate_id(conn);
  91     uint32_t values[] = {get_colorpixel(color)};
  92     xcb_create_gc(conn, gc, bg_pixmap, XCB_GC_FOREGROUND, values);
  93     xcb_rectangle_t rect = {0, 0, resolution[0], resolution[1]};
  94     xcb_poly_fill_rectangle(conn, bg_pixmap, gc, 1, &rect);
  95     xcb_free_gc(conn, gc);
  96
  97     return bg_pixmap;
  98 }
  99
 100 xcb_window_t open_fullscreen_window(xcb_connection_t *conn, xcb_screen_t *scr, char *color, xcb_pixmap_t pixmap) {
 101     uint32_t mask = 0;
 102     uint32_t values[3];
 103     xcb_window_t win = xcb_generate_id(conn);
 104
 105     if (pixmap == XCB_NONE) {
 106         mask |= XCB_CW_BACK_PIXEL;
 107         values[0] = get_colorpixel(color);
 108     } else {
 109         mask |= XCB_CW_BACK_PIXMAP;
 110         values[0] = pixmap;
 111     }
 112
 113     mask |= XCB_CW_OVERRIDE_REDIRECT;
 114     values[1] = 1;
 115
 116     mask |= XCB_CW_EVENT_MASK;
 117     values[2] = XCB_EVENT_MASK_EXPOSURE |
 118                 XCB_EVENT_MASK_KEY_PRESS |
 119                 XCB_EVENT_MASK_KEY_RELEASE |
 120                 XCB_EVENT_MASK_VISIBILITY_CHANGE |
 121                 XCB_EVENT_MASK_STRUCTURE_NOTIFY;
 122
 123     xcb_create_window(conn,
 124                       XCB_COPY_FROM_PARENT,
 125                       win,       /* the window id */
 126                       scr->root, /* parent == root */
 127                       0, 0,
 128                       scr->width_in_pixels,
 129                       scr->height_in_pixels, /* dimensions */
 130                       0,                     /* border = 0, we draw our own */
 131                       XCB_WINDOW_CLASS_INPUT_OUTPUT,
 132                       XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
 133                       mask,
 134                       values);
 135
 136     char *name = "i3lock";
 137     xcb_change_property(conn,
 138                         XCB_PROP_MODE_REPLACE,
 139                         win,
 140                         XCB_ATOM_WM_NAME,
 141                         XCB_ATOM_STRING,
 142                         8,
 143                         strlen(name),
 144                         name);
 145
 146     /* Map the window (= make it visible) */
 147     xcb_map_window(conn, win);
 148
 149     /* Raise window (put it on top) */
 150     values[0] = XCB_STACK_MODE_ABOVE;
 151     xcb_configure_window(conn, win, XCB_CONFIG_WINDOW_STACK_MODE, values);
 152
 153     return win;
 154 }
 155
 156 /*
 157  * Repeatedly tries to grab pointer and keyboard (up to 1000 times).
 158  *
 159  */
 160 void grab_pointer_and_keyboard(xcb_connection_t *conn, xcb_screen_t *screen, xcb_cursor_t cursor) {
 161     xcb_grab_pointer_cookie_t pcookie;
 162     xcb_grab_pointer_reply_t *preply;
 163
 164     xcb_grab_keyboard_cookie_t kcookie;
 165     xcb_grab_keyboard_reply_t *kreply;
 166
 167     int tries = 10000;
 168
 169     while (tries-- > 0) {
 170         pcookie = xcb_grab_pointer(
 171             conn,
 172             false,               /* get all pointer events specified by the following mask */
 173             screen->root,        /* grab the root window */
 174             XCB_NONE,            /* which events to let through */
 175             XCB_GRAB_MODE_ASYNC, /* pointer events should continue as normal */
 176             XCB_GRAB_MODE_ASYNC, /* keyboard mode */
 177             XCB_NONE,            /* confine_to = in which window should the cursor stay */
 178             cursor,              /* we change the cursor to whatever the user wanted */
 179             XCB_CURRENT_TIME);
 180
 181         if ((preply = xcb_grab_pointer_reply(conn, pcookie, NULL)) &&
 182             preply->status == XCB_GRAB_STATUS_SUCCESS) {
 183             free(preply);
 184             break;
 185         }
 186
 187         /* Make this quite a bit slower */
 188         usleep(50);
 189     }
 190
 191     while (tries-- > 0) {
 192         kcookie = xcb_grab_keyboard(
 193             conn,
 194             true,         /* report events */
 195             screen->root, /* grab the root window */
 196             XCB_CURRENT_TIME,
 197             XCB_GRAB_MODE_ASYNC, /* process events as normal, do not require sync */
 198             XCB_GRAB_MODE_ASYNC);
 199
 200         if ((kreply = xcb_grab_keyboard_reply(conn, kcookie, NULL)) &&
 201             kreply->status == XCB_GRAB_STATUS_SUCCESS) {
 202             free(kreply);
 203             break;
 204         }
 205
 206         /* Make this quite a bit slower */
 207         usleep(50);
 208     }
 209
 210     if (tries <= 0)
 211         errx(EXIT_FAILURE, "Cannot grab pointer/keyboard");
 212 }
 213
 214 xcb_cursor_t create_cursor(xcb_connection_t *conn, xcb_screen_t *screen, xcb_window_t win, int choice) {
 215     xcb_pixmap_t bitmap;
 216     xcb_pixmap_t mask;
 217     xcb_cursor_t cursor;
 218
 219     unsigned char *curs_bits;
 220     unsigned char *mask_bits;
 221     int curs_w, curs_h;
 222
 223     switch (choice) {
 224         case CURS_NONE:
 225             curs_bits = curs_invisible_bits;
 226             mask_bits = curs_invisible_bits;
 227             curs_w = curs_invisible_width;
 228             curs_h = curs_invisible_height;
 229             break;
 230         case CURS_WIN:
 231             curs_bits = curs_windows_bits;
 232             mask_bits = mask_windows_bits;
 233             curs_w = curs_windows_width;
 234             curs_h = curs_windows_height;
 235             break;
 236         case CURS_DEFAULT:
 237         default:
 238             return XCB_NONE; /* XCB_NONE is xcb's way of saying "don't change the cursor" */
 239     }
 240
 241     bitmap = xcb_create_pixmap_from_bitmap_data(conn,
 242                                                 win,
 243                                                 curs_bits,
 244                                                 curs_w,
 245                                                 curs_h,
 246                                                 1,
 247                                                 screen->white_pixel,
 248                                                 screen->black_pixel,
 249                                                 NULL);
 250
 251     mask = xcb_create_pixmap_from_bitmap_data(conn,
 252                                               win,
 253                                               mask_bits,
 254                                               curs_w,
 255                                               curs_h,
 256                                               1,
 257                                               screen->white_pixel,
 258                                               screen->black_pixel,
 259                                               NULL);
 260
 261     cursor = xcb_generate_id(conn);
 262
 263     xcb_create_cursor(conn,
 264                       cursor,
 265                       bitmap,
 266                       mask,
 267                       65535, 65535, 65535,
 268                       0, 0, 0,
 269                       0, 0);
 270
 271     xcb_free_pixmap(conn, bitmap);
 272     xcb_free_pixmap(conn, mask);
 273
 274     return cursor;
 275 }