gecko-dev/dom/plugins/NPEventX11.h

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/* -*- Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 8 -*- */
/* vim: set sw=4 ts=8 et tw=80 ft=cpp : */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Plugin App.
*
* The Initial Developer of the Original Code is
* The Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Chris Jones <jones.chris.g@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef mozilla_dom_plugins_NPEventX11_h
#define mozilla_dom_plugins_NPEventX11_h 1
#include "npapi.h"
#include "mozilla/X11Util.h"
namespace mozilla {
namespace plugins {
struct NPRemoteEvent {
NPEvent event;
};
}
}
//
// XEvent is defined as a union of all more specific X*Events.
// Luckily, as of xorg 1.6.0 / X protocol 11 rev 0, the only pointer
// field contained in any of these specific X*Event structs is a
// |Display*|. So to simplify serializing these XEvents, we make the
//
// ********** XXX ASSUMPTION XXX **********
//
// that the process to which the event is forwarded shares the same
// display as the process on which the event originated.
//
// With this simplification, serialization becomes a simple memcpy to
// the output stream. Deserialization starts as just a memcpy from
// the input stream, BUT we then have to write the correct |Display*|
// into the right field of each X*Event that contains one.
//
namespace IPC {
template <>
struct ParamTraits<mozilla::plugins::NPRemoteEvent> // synonym for XEvent
{
typedef mozilla::plugins::NPRemoteEvent paramType;
static void Write(Message* aMsg, const paramType& aParam)
{
aMsg->WriteBytes(&aParam, sizeof(paramType));
}
static bool Read(const Message* aMsg, void** aIter, paramType* aResult)
{
const char* bytes = 0;
if (!aMsg->ReadBytes(aIter, &bytes, sizeof(paramType))) {
return false;
}
memcpy(aResult, bytes, sizeof(paramType));
SetXDisplay(aResult->event);
return true;
}
static void Log(const paramType& aParam, std::wstring* aLog)
{
// TODO
aLog->append(L"(XEvent)");
}
private:
static void SetXDisplay(XEvent& ev)
{
Display* display = mozilla::DefaultXDisplay();
if (ev.type >= KeyPress) {
ev.xany.display = display;
}
else {
// XXX assuming that this is an error event
// (type == 0? not clear from Xlib.h)
ev.xerror.display = display;
}
}
};
} // namespace IPC
#endif // ifndef mozilla_dom_plugins_NPEventX11_h