text: /*
   * vim:ts=8:expandtab
   *
   * i3 - an improved dynamic tiling window manager
   *
   * © 2009 Michael Stapelberg and contributors
   *
   * See file LICENSE for license information.
   *
   */
  #include <stdint.h>
  #include <stdlib.h>
  #include <string.h>
  #include <stdio.h>
  #include <err.h>
  
  #include <xcb/xcb.h>
  #include <xcb/xcb_keysyms.h>
  
  #include <X11/keysym.h>
  
  #include "xcb.h"
  
  extern xcb_window_t root;
  unsigned int xcb_numlock_mask;
  
  /*
   * Convenience-wrapper around xcb_change_gc which saves us declaring a variable
   *
   */
  void xcb_change_gc_single(xcb_connection_t *conn, xcb_gcontext_t gc, uint32_t mask, uint32_t value) {
          xcb_change_gc(conn, gc, mask, &value);
  }
  
  /*
   * Returns the colorpixel to use for the given hex color (think of HTML).
   *
   * The hex_color has to start with #, for example #FF00FF.
   *
   * NOTE that get_colorpixel() does _NOT_ check the given color code for validity.
   * This has to be done by the caller.
   *
   */
  uint32_t get_colorpixel(xcb_connection_t *conn, char *hex) {
          char strgroups[3][3] = {{hex[1], hex[2], '\0'},
                                  {hex[3], hex[4], '\0'},
                                  {hex[5], hex[6], '\0'}};
          uint32_t rgb16[3] = {(strtol(strgroups[0], NULL, 16)),
                               (strtol(strgroups[1], NULL, 16)),
                               (strtol(strgroups[2], NULL, 16))};
  
          return (rgb16[0] << 16) + (rgb16[1] << 8) + rgb16[2];
  }
  
  /*
   * Returns the mask for Mode_switch (to be used for looking up keysymbols by
   * keycode).
   *
   */
  uint32_t get_mod_mask(xcb_connection_t *conn, uint32_t keycode) {
  	xcb_key_symbols_t *symbols = xcb_key_symbols_alloc(conn);
  
  	xcb_get_modifier_mapping_reply_t *modmap_r;
  	xcb_keycode_t *modmap, kc;
  	xcb_keycode_t *modeswitchcodes = xcb_key_symbols_get_keycode(symbols, keycode);
  	if (modeswitchcodes == NULL)
  		return 0;
  
  	modmap_r = xcb_get_modifier_mapping_reply(conn, xcb_get_modifier_mapping(conn), NULL);
  	modmap = xcb_get_modifier_mapping_keycodes(modmap_r);
  
  	for (int i = 0; i < 8; i++)
  		for (int j = 0; j < modmap_r->keycodes_per_modifier; j++) {
  			kc = modmap[i * modmap_r->keycodes_per_modifier + j];
  			for (xcb_keycode_t *ktest = modeswitchcodes; *ktest; ktest++) {
  				if (*ktest != kc)
  					continue;
  
  				free(modeswitchcodes);
  				free(modmap_r);
  				return (1 << i);
  			}
  		}
  
  	return 0;
  }
  
  /*
   * Opens the window we use for input/output and maps it
   *
   */
  xcb_window_t open_input_window(xcb_connection_t *conn, uint32_t width, uint32_t height) {
          xcb_window_t win = xcb_generate_id(conn);
          //xcb_cursor_t cursor_id = xcb_generate_id(conn);
  
  #if 0
          /* Use the default cursor (left pointer) */
          if (cursor > -1) {
                  i3Font *cursor_font = load_font(conn, "cursor");
                  xcb_create_glyph_cursor(conn, cursor_id, cursor_font->id, cursor_font->id,
                                  XCB_CURSOR_LEFT_PTR, XCB_CURSOR_LEFT_PTR + 1,
                                  0, 0, 0, 65535, 65535, 65535);
          }
  #endif
  
          uint32_t mask = 0;
          uint32_t values[3];
  
          mask |= XCB_CW_BACK_PIXEL;
          values[0] = 0;
  
  	mask |= XCB_CW_EVENT_MASK;
  	values[1] = XCB_EVENT_MASK_EXPOSURE;
  
          xcb_create_window(conn,
                            XCB_COPY_FROM_PARENT,
                            win, /* the window id */
                            root, /* parent == root */
                            490, 297, width, height, /* dimensions */
                            0, /* border = 0, we draw our own */
                            XCB_WINDOW_CLASS_INPUT_OUTPUT,
                            XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
                            mask,
                            values);
  
  #if 0
          if (cursor > -1)
                  xcb_change_window_attributes(conn, result, XCB_CW_CURSOR, &cursor_id);
  #endif
  
          /* Map the window (= make it visible) */
          xcb_map_window(conn, win);
  
  	return win;
  }
  
  /*
   * Returns the ID of the font matching the given pattern and stores the height
   * of the font (in pixels) in *font_height. die()s if no font matches.
   *
   */
  int get_font_id(xcb_connection_t *conn, char *pattern, int *font_height) {
          xcb_void_cookie_t font_cookie;
          xcb_list_fonts_with_info_cookie_t info_cookie;
  
          /* Send all our requests first */
          int result;
          result = xcb_generate_id(conn);
          font_cookie = xcb_open_font_checked(conn, result, strlen(pattern), pattern);
          info_cookie = xcb_list_fonts_with_info(conn, 1, strlen(pattern), pattern);
  
          xcb_generic_error_t *error = xcb_request_check(conn, font_cookie);
          if (error != NULL) {
                  fprintf(stderr, "ERROR: Could not open font: %d\n", error->error_code);
                  exit(1);
          }
  
          /* Get information (height/name) for this font */
          xcb_list_fonts_with_info_reply_t *reply = xcb_list_fonts_with_info_reply(conn, info_cookie, NULL);
          if (reply == NULL)
                  errx(1, "Could not load font \"%s\"\n", pattern);
  
          *font_height = reply->font_ascent + reply->font_descent;
  
          return result;
  }
  
  /*
   * Finds out which modifier mask is the one for numlock, as the user may change this.
   *
   */
  void xcb_get_numlock_mask(xcb_connection_t *conn) {
      xcb_key_symbols_t *keysyms;
      xcb_get_modifier_mapping_cookie_t cookie;
      xcb_get_modifier_mapping_reply_t *reply;
      xcb_keycode_t *modmap;
      int mask, i;
      const int masks[8] = { XCB_MOD_MASK_SHIFT,
                             XCB_MOD_MASK_LOCK,
                             XCB_MOD_MASK_CONTROL,
                             XCB_MOD_MASK_1,
                             XCB_MOD_MASK_2,
                             XCB_MOD_MASK_3,
                             XCB_MOD_MASK_4,
                             XCB_MOD_MASK_5 };
  
      /* Request the modifier map */
      cookie = xcb_get_modifier_mapping_unchecked(conn);
  
      /* Get the keysymbols */
      keysyms = xcb_key_symbols_alloc(conn);
  
      if ((reply = xcb_get_modifier_mapping_reply(conn, cookie, NULL)) == NULL) {
          xcb_key_symbols_free(keysyms);
          return;
      }
  
      modmap = xcb_get_modifier_mapping_keycodes(reply);
  
      /* Get the keycode for numlock */
  #ifdef OLD_XCB_KEYSYMS_API
      xcb_keycode_t numlock = xcb_key_symbols_get_keycode(keysyms, XCB_NUM_LOCK);
  #else
      /* For now, we only use the first keysymbol. */
      xcb_keycode_t *numlock_syms = xcb_key_symbols_get_keycode(keysyms, XCB_NUM_LOCK);
      if (numlock_syms == NULL)
          return;
      xcb_keycode_t numlock = *numlock_syms;
      free(numlock_syms);
  #endif
  
      /* Check all modifiers (Mod1-Mod5, Shift, Control, Lock) */
      for (mask = 0; mask < 8; mask++)
          for (i = 0; i < reply->keycodes_per_modifier; i++)
              if (modmap[(mask * reply->keycodes_per_modifier) + i] == numlock)
                  xcb_numlock_mask = masks[mask];
  
      xcb_key_symbols_free(keysyms);
      free(reply);
  }
  
  