RetroArch/input/drivers_keyboard/keyboard_event_x11.c

/*  RetroArch - A frontend for libretro.
 *  Copyright (C) 2010-2014 - Hans-Kristian Arntzen
 *  Copyright (C) 2011-2017 - Daniel De Matteis
 * 
 *  RetroArch is free software: you can redistribute it and/or modify it under the terms
 *  of the GNU General Public License as published by the Free Software Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 *  PURPOSE.  See the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along with RetroArch.
 *  If not, see <http://www.gnu.org/licenses/>.
 */

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/keysymdef.h>
#include <X11/extensions/xf86vmode.h>

#include <boolean.h>
#include <retro_inline.h>
#include <encodings/utf.h>
#include <retro_miscellaneous.h>

#ifdef HAVE_CONFIG_H
#include "../../config.h"
#endif

#ifdef HAVE_XINERAMA
#include <X11/extensions/Xinerama.h>
#endif

#include "../input_keyboard.h"
#include "../input_keymaps.h"

void x11_handle_key_event(XEvent *event, XIC ic, bool filter)
{
   int i;
   unsigned key;
   unsigned state = event->xkey.state;
   uint16_t mod = 0;
   uint32_t chars[32];

   bool down     = event->type == KeyPress;
   int num       = 0;
   KeySym keysym = 0;
   
   chars[0] = '\0';

   if (!filter)
   {
      if (down)
      {
         char keybuf[32];

         keybuf[0] = '\0';
#ifdef X_HAVE_UTF8_STRING
         Status status = 0;

         /* XwcLookupString doesn't seem to work. */
         num = Xutf8LookupString(ic, &event->xkey, keybuf, ARRAY_SIZE(keybuf), &keysym, &status);

         /* libc functions need UTF-8 locale to work properly, 
          * which makes mbrtowc a bit impractical.
          *
          * Use custom UTF8 -> UTF-32 conversion. */
         num = utf8_conv_utf32(chars, ARRAY_SIZE(chars), keybuf, num);
#else
         (void)ic;
         num = XLookupString(&event->xkey, keybuf, sizeof(keybuf), &keysym, NULL); /* ASCII only. */
         for (i = 0; i < num; i++)
            chars[i] = keybuf[i] & 0x7f;
#endif
      }
      else
         keysym = XLookupKeysym(&event->xkey, (state & ShiftMask) || (state & LockMask));
   }

   /* We can't feed uppercase letters to the keycode translator. Seems like a bad idea
    * to feed it keysyms anyway, so here is a little hack... */
   if (keysym >= XK_A && keysym <= XK_Z)
       keysym += XK_z - XK_Z;

   key   = input_keymaps_translate_keysym_to_rk(keysym);

   if (state & ShiftMask)
      mod |= RETROKMOD_SHIFT;
   if (state & LockMask)
      mod |= RETROKMOD_CAPSLOCK;
   if (state & ControlMask)
      mod |= RETROKMOD_CTRL;
   if (state & Mod1Mask)
      mod |= RETROKMOD_ALT;
   if (state & Mod4Mask)
      mod |= RETROKMOD_META;
   if (IsKeypadKey(keysym))
      mod |= RETROKMOD_NUMLOCK;

   input_keyboard_event(down, key, chars[0], mod, RETRO_DEVICE_KEYBOARD);

   for (i = 1; i < num; i++)
      input_keyboard_event(down, RETROK_UNKNOWN,
            chars[i], mod, RETRO_DEVICE_KEYBOARD);
}