git.sur5r.net Git - i3/i3lock/blob - xcb.c

   1 /*
   2  * vim:ts=4:sw=4:expandtab
   3  *
   4  * © 2010-2011 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_keysyms.h>
  12 #include <xcb/xcb_image.h>
  13 #include <xcb/dpms.h>
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <stdbool.h>
  17 #include <unistd.h>
  18 #include <assert.h>
  19 #include <err.h>
  20
  21 #include "cursors.h"
  22
  23 #define curs_invisible_width 8
  24 #define curs_invisible_height 8
  25
  26 static unsigned char curs_invisible_bits[] = {
  27  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
  28
  29 #define curs_windows_width 11
  30 #define curs_windows_height 19
  31
  32 static unsigned char curs_windows_bits[] = {
  33  0xfe, 0x07, 0xfc, 0x07, 0xfa, 0x07, 0xf6, 0x07, 0xee, 0x07, 0xde, 0x07,
  34  0xbe, 0x07, 0x7e, 0x07, 0xfe, 0x06, 0xfe, 0x05, 0x3e, 0x00, 0xb6, 0x07,
  35  0x6a, 0x07, 0x6c, 0x07, 0xde, 0x06, 0xdf, 0x06, 0xbf, 0x05, 0xbf, 0x05,
  36  0x7f, 0x06 };
  37
  38 #define mask_windows_width 11
  39 #define mask_windows_height 19
  40
  41 static unsigned char mask_windows_bits[] = {
  42  0x01, 0x00, 0x03, 0x00, 0x07, 0x00, 0x0f, 0x00, 0x1f, 0x00, 0x3f, 0x00,
  43  0x7f, 0x00, 0xff, 0x00, 0xff, 0x01, 0xff, 0x03, 0xff, 0x07, 0x7f, 0x00,
  44  0xf7, 0x00, 0xf3, 0x00, 0xe1, 0x01, 0xe0, 0x01, 0xc0, 0x03, 0xc0, 0x03,
  45  0x80, 0x01 };
  46
  47 static uint32_t get_colorpixel(char *hex) {
  48     char strgroups[3][3] = {{hex[0], hex[1], '\0'},
  49                             {hex[2], hex[3], '\0'},
  50                             {hex[4], hex[5], '\0'}};
  51     uint32_t rgb16[3] = {(strtol(strgroups[0], NULL, 16)),
  52                          (strtol(strgroups[1], NULL, 16)),
  53                          (strtol(strgroups[2], NULL, 16))};
  54
  55     return (rgb16[0] << 16) + (rgb16[1] << 8) + rgb16[2];
  56 }
  57
  58 xcb_visualtype_t *get_root_visual_type(xcb_screen_t *screen) {
  59     xcb_visualtype_t *visual_type = NULL;
  60     xcb_depth_iterator_t depth_iter;
  61     xcb_visualtype_iterator_t visual_iter;
  62
  63     for (depth_iter = xcb_screen_allowed_depths_iterator(screen);
  64          depth_iter.rem;
  65          xcb_depth_next(&depth_iter)) {
  66
  67         for (visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
  68              visual_iter.rem;
  69              xcb_visualtype_next(&visual_iter)) {
  70             if (screen->root_visual != visual_iter.data->visual_id)
  71                 continue;
  72
  73             visual_type = visual_iter.data;
  74             return visual_type;
  75         }
  76     }
  77
  78     return NULL;
  79 }
  80
  81 xcb_pixmap_t create_bg_pixmap(xcb_connection_t *conn, xcb_screen_t *scr, u_int32_t* resolution, char *color) {
  82     xcb_pixmap_t bg_pixmap = xcb_generate_id(conn);
  83     xcb_create_pixmap(conn, scr->root_depth, bg_pixmap, scr->root,
  84                       resolution[0], resolution[1]);
  85
  86     /* Generate a Graphics Context and fill the pixmap with background color
  87      * (for images that are smaller than your screen) */
  88     xcb_gcontext_t gc = xcb_generate_id(conn);
  89     uint32_t values[] = { get_colorpixel(color) };
  90     xcb_create_gc(conn, gc, bg_pixmap, XCB_GC_FOREGROUND, values);
  91     xcb_rectangle_t rect = { 0, 0, resolution[0], resolution[1] };
  92     xcb_poly_fill_rectangle(conn, bg_pixmap, gc, 1, &rect);
  93     xcb_free_gc(conn, gc);
  94
  95     return bg_pixmap;
  96 }
  97
  98 xcb_window_t open_fullscreen_window(xcb_connection_t *conn, xcb_screen_t *scr, char *color, xcb_pixmap_t pixmap) {
  99     uint32_t mask = 0;
 100     uint32_t values[3];
 101     xcb_window_t win = xcb_generate_id(conn);
 102
 103     if (pixmap == XCB_NONE) {
 104         mask |= XCB_CW_BACK_PIXEL;
 105         values[0] = get_colorpixel(color);
 106     } else {
 107         mask |= XCB_CW_BACK_PIXMAP;
 108         values[0] = pixmap;
 109     }
 110
 111     mask |= XCB_CW_OVERRIDE_REDIRECT;
 112     values[1] = 1;
 113
 114     mask |= XCB_CW_EVENT_MASK;
 115     values[2] = XCB_EVENT_MASK_EXPOSURE |
 116                 XCB_EVENT_MASK_KEY_PRESS |
 117                 XCB_EVENT_MASK_KEY_RELEASE |
 118                 XCB_EVENT_MASK_VISIBILITY_CHANGE |
 119                 XCB_EVENT_MASK_STRUCTURE_NOTIFY;
 120
 121     xcb_create_window(conn,
 122                       24,
 123                       win, /* the window id */
 124                       scr->root, /* parent == root */
 125                       0, 0,
 126                       scr->width_in_pixels,
 127                       scr->height_in_pixels, /* dimensions */
 128                       0, /* border = 0, we draw our own */
 129                       XCB_WINDOW_CLASS_INPUT_OUTPUT,
 130                       XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
 131                       mask,
 132                       values);
 133
 134     /* Map the window (= make it visible) */
 135     xcb_map_window(conn, win);
 136
 137     /* Raise window (put it on top) */
 138     values[0] = XCB_STACK_MODE_ABOVE;
 139     xcb_configure_window(conn, win, XCB_CONFIG_WINDOW_STACK_MODE, values);
 140
 141     return win;
 142 }
 143
 144 /*
 145  * Returns the mask for Mode_switch (to be used for looking up keysymbols by
 146  * keycode).
 147  *
 148  */
 149 uint32_t get_mod_mask(xcb_connection_t *conn, xcb_key_symbols_t *symbols, uint32_t keycode) {
 150     xcb_get_modifier_mapping_reply_t *modmap_r;
 151     xcb_keycode_t *modmap, kc;
 152     xcb_keycode_t *modeswitchcodes = xcb_key_symbols_get_keycode(symbols, keycode);
 153     if (modeswitchcodes == NULL)
 154         return 0;
 155
 156     modmap_r = xcb_get_modifier_mapping_reply(conn, xcb_get_modifier_mapping(conn), NULL);
 157     modmap = xcb_get_modifier_mapping_keycodes(modmap_r);
 158
 159     for (int i = 0; i < 8; i++)
 160         for (int j = 0; j < modmap_r->keycodes_per_modifier; j++) {
 161             kc = modmap[i * modmap_r->keycodes_per_modifier + j];
 162             for (xcb_keycode_t *ktest = modeswitchcodes; *ktest; ktest++) {
 163                 if (*ktest != kc)
 164                     continue;
 165
 166                 free(modeswitchcodes);
 167                 free(modmap_r);
 168                 return (1 << i);
 169             }
 170         }
 171
 172     return 0;
 173 }
 174
 175 void dpms_turn_off_screen(xcb_connection_t *conn) {
 176     xcb_dpms_enable(conn);
 177     xcb_dpms_force_level(conn, XCB_DPMS_DPMS_MODE_OFF);
 178     xcb_flush(conn);
 179 }
 180
 181 /*
 182  * Repeatedly tries to grab pointer and keyboard (up to 1000 times).
 183  *
 184  */
 185 void grab_pointer_and_keyboard(xcb_connection_t *conn, xcb_screen_t *screen, xcb_cursor_t cursor) {
 186     xcb_grab_pointer_cookie_t pcookie;
 187     xcb_grab_pointer_reply_t *preply;
 188
 189     xcb_grab_keyboard_cookie_t kcookie;
 190     xcb_grab_keyboard_reply_t *kreply;
 191
 192     int tries = 10000;
 193
 194     while (tries-- > 0) {
 195         pcookie = xcb_grab_pointer(
 196             conn,
 197             false,               /* get all pointer events specified by the following mask */
 198             screen->root,        /* grab the root window */
 199             XCB_NONE,            /* which events to let through */
 200             XCB_GRAB_MODE_ASYNC, /* pointer events should continue as normal */
 201             XCB_GRAB_MODE_ASYNC, /* keyboard mode */
 202             XCB_NONE,            /* confine_to = in which window should the cursor stay */
 203             cursor,              /* we change the cursor to whatever the user wanted */
 204             XCB_CURRENT_TIME
 205         );
 206
 207         if ((preply = xcb_grab_pointer_reply(conn, pcookie, NULL)) &&
 208             preply->status == XCB_GRAB_STATUS_SUCCESS) {
 209             free(preply);
 210             break;
 211         }
 212
 213         /* Make this quite a bit slower */
 214         usleep(50);
 215     }
 216
 217     while (tries-- > 0) {
 218         kcookie = xcb_grab_keyboard(
 219             conn,
 220             true,                /* report events */
 221             screen->root,        /* grab the root window */
 222             XCB_CURRENT_TIME,
 223             XCB_GRAB_MODE_ASYNC, /* process events as normal, do not require sync */
 224             XCB_GRAB_MODE_ASYNC
 225         );
 226
 227         if ((kreply = xcb_grab_keyboard_reply(conn, kcookie, NULL)) &&
 228             kreply->status == XCB_GRAB_STATUS_SUCCESS) {
 229             free(kreply);
 230             break;
 231         }
 232
 233         /* Make this quite a bit slower */
 234         usleep(50);
 235     }
 236
 237     if (tries <= 0)
 238         errx(EXIT_FAILURE, "Cannot grab pointer/keyboard");
 239 }
 240
 241 xcb_cursor_t create_cursor(xcb_connection_t *conn, xcb_screen_t *screen, xcb_window_t win, int choice) {
 242     xcb_pixmap_t bitmap;
 243     xcb_pixmap_t mask;
 244     xcb_cursor_t cursor;
 245
 246     unsigned char* curs_bits;
 247     unsigned char* mask_bits;
 248     int curs_w, curs_h;
 249
 250     switch (choice) {
 251         case CURS_NONE:
 252             curs_bits = curs_invisible_bits;
 253             mask_bits = curs_invisible_bits;
 254             curs_w = curs_invisible_width;
 255             curs_h = curs_invisible_height;
 256             break;
 257         case CURS_WIN:
 258             curs_bits = curs_windows_bits;
 259             mask_bits = mask_windows_bits;
 260             curs_w = curs_windows_width;
 261             curs_h = curs_windows_height;
 262             break;
 263         case CURS_DEFAULT:
 264         default:
 265             return XCB_NONE; /* XCB_NONE is xcb's way of saying "don't change the cursor" */
 266     }
 267
 268     bitmap = xcb_create_pixmap_from_bitmap_data(conn,
 269                                                 win,
 270                                                 curs_bits,
 271                                                 curs_w,
 272                                                 curs_h,
 273                                                 1,
 274                                                 screen->white_pixel,
 275                                                 screen->black_pixel,
 276                                                 NULL);
 277
 278     mask = xcb_create_pixmap_from_bitmap_data(conn,
 279                                               win,
 280                                               mask_bits,
 281                                               curs_w,
 282                                               curs_h,
 283                                               1,
 284                                               screen->white_pixel,
 285                                               screen->black_pixel,
 286                                               NULL);
 287
 288     cursor = xcb_generate_id(conn);
 289
 290     xcb_create_cursor(conn,
 291                       cursor,
 292                       bitmap,
 293                       mask,
 294                       65535,65535,65535,
 295                       0,0,0,
 296                       0,0);
 297
 298     xcb_free_pixmap(conn, bitmap);
 299     xcb_free_pixmap(conn, mask);
 300
 301     return cursor;
 302 }