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      1 /*
      2  * Copyright 2003 Red Hat Inc., Durham, North Carolina.
      3  *
      4  * All Rights Reserved.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining
      7  * a copy of this software and associated documentation files (the
      8  * "Software"), to deal in the Software without restriction, including
      9  * without limitation on the rights to use, copy, modify, merge,
     10  * publish, distribute, sublicense, and/or sell copies of the Software,
     11  * and to permit persons to whom the Software is furnished to do so,
     12  * subject to the following conditions:
     13  *
     14  * The above copyright notice and this permission notice (including the
     15  * next paragraph) shall be included in all copies or substantial
     16  * portions of the Software.
     17  *
     18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     19  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     21  * NON-INFRINGEMENT.  IN NO EVENT SHALL RED HAT AND/OR THEIR SUPPLIERS
     22  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
     23  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     25  * SOFTWARE.
     26  */
     27 
     28 /*
     29  * Authors:
     30  *   Rickard E. (Rik) Faith <faith (at) redhat.com>
     31  */
     32 
     33 /** \file
     34  *
     35  * This file implements a mapping from remote XInput event types to Xdmx
     36  * XInput event types.
     37  *
     38  * The exglobals.h file defines global server-side variables with names
     39  * Device* to be integers that hold the value of the type of the
     40  * server-side XInput extension event.
     41  *
     42  * The client-side X11/extensions/XInput.h file defines macros with THE
     43  * EXACT SAME Device* names!
     44  *
     45  * Using those macros to extract remote server event type values from
     46  * the (opaque) XDevice structure is appropriate, but makes a direct
     47  * mapping to the Device* integers impossible.  So we use the normalized
     48  * XI_Device* names for these routines.
     49  */
     50 
     51 #ifdef HAVE_DMX_CONFIG_H
     52 #include <dmx-config.h>
     53 #endif
     54 
     55 #include "dmxinputinit.h"
     56 #include "dmxmap.h"
     57 
     58 /** Create a mapping from \a remoteEvent to \a serverEvent. The \a
     59  * remoteEvent is the type returned from the remote server.  The \a
     60  * serverEvent is from the XI_* list of events in
     61  * include/extensions/XIproto.h. */
     62 void dmxMapInsert(DMXLocalInputInfoPtr dmxLocal,
     63                   int remoteEvent, int serverEvent)
     64 {
     65     int hash = remoteEvent & DMX_MAP_MASK;
     66     int i;
     67 
     68                                 /* Return if this has already been mapped */
     69     if (dmxLocal->map[hash].remote == remoteEvent
     70         && dmxLocal->map[hash].server == serverEvent) return;
     71 
     72     if (dmxLocal->map[hash].remote) {
     73         dmxLocal->mapOptimize = 0;
     74         for (i = 0; i < DMX_MAP_ENTRIES; i++) {
     75             if (!dmxLocal->map[i].remote) {
     76                 dmxLocal->map[i].remote = remoteEvent;
     77                 dmxLocal->map[i].server = serverEvent;
     78                 return;
     79             }
     80         }
     81         dmxLog(dmxWarning,
     82                "Out of map entries, cannot map remove event type %d\n",
     83                remoteEvent);
     84     } else {
     85         dmxLocal->map[hash].remote = remoteEvent;
     86         dmxLocal->map[hash].server = serverEvent;
     87     }
     88 }
     89 
     90 /** Remove all mappings there were inserted with #dmxMapInsert. */
     91 void dmxMapClear(DMXLocalInputInfoPtr dmxLocal)
     92 {
     93     int i;
     94 
     95     for (i = 0; i < DMX_MAP_ENTRIES; i++) dmxLocal->map[i].remote = 0;
     96     dmxLocal->mapOptimize = 1;
     97 }
     98 
     99 /** Lookup a mapping for \a remoteEvent.  The \a remoteEvent is the type
    100  * returned from the remote server.  The return value is that which was
    101  * passed into #dmxMapInsert (i.e., a value from the XI_* list in
    102  * include/extensions/XIproto.h).  If a mapping is not available, -1 is
    103  * returned. */
    104 int dmxMapLookup(DMXLocalInputInfoPtr dmxLocal, int remoteEvent)
    105 {
    106     int hash        = remoteEvent & DMX_MAP_MASK;
    107     int serverEvent = -1;
    108     int i;
    109 
    110     if (dmxLocal->mapOptimize && dmxLocal->map[hash].remote == remoteEvent) {
    111         serverEvent = dmxLocal->map[hash].server;
    112     } else {
    113         for (i = 0; i < DMX_MAP_ENTRIES; i++)
    114             if (dmxLocal->map[i].remote == remoteEvent) {
    115                 serverEvent = dmxLocal->map[hash].server;
    116                 break;
    117             }
    118     }
    119 
    120     return serverEvent;
    121 }
    122