The Tor Browser: dom/plugins/ipc/NPEventUnix.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 8 -*- */

     2 /* vim: set sw=4 ts=8 et tw=80 ft=cpp : */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #ifndef mozilla_dom_plugins_NPEventUnix_h

     8 #define mozilla_dom_plugins_NPEventUnix_h 1

    10 #include "npapi.h"

    12 #ifdef MOZ_X11

    13 #include "mozilla/X11Util.h"

    14 #endif

    16 namespace mozilla {

    18 namespace plugins {

    20 struct NPRemoteEvent {

    21     NPEvent event;

    22 };

    24 }

    26 }

    29 //

    30 // XEvent is defined as a union of all more specific X*Events.

    31 // Luckily, as of xorg 1.6.0 / X protocol 11 rev 0, the only pointer

    32 // field contained in any of these specific X*Event structs is a

    33 // |Display*|.  So to simplify serializing these XEvents, we make the

    34 //

    35 // ********** XXX ASSUMPTION XXX **********

    36 //

    37 // that the process to which the event is forwarded shares the same

    38 // display as the process on which the event originated.

    39 //

    40 // With this simplification, serialization becomes a simple memcpy to

    41 // the output stream.  Deserialization starts as just a memcpy from

    42 // the input stream, BUT we then have to write the correct |Display*|

    43 // into the right field of each X*Event that contains one.

    44 //

    46 namespace IPC {

    48 template <>

    49 struct ParamTraits<mozilla::plugins::NPRemoteEvent>     // synonym for XEvent

    50 {

    51     typedef mozilla::plugins::NPRemoteEvent paramType;

    53     static void Write(Message* aMsg, const paramType& aParam)

    54     {

    55         aMsg->WriteBytes(&aParam, sizeof(paramType));

    56     }

    58     static bool Read(const Message* aMsg, void** aIter, paramType* aResult)

    59     {

    60         const char* bytes = 0;

    62         if (!aMsg->ReadBytes(aIter, &bytes, sizeof(paramType))) {

    63             return false;

    64         }

    66         memcpy(aResult, bytes, sizeof(paramType));

    68 #ifdef MOZ_X11

    69         SetXDisplay(aResult->event);

    70 #endif

    71         return true;

    72     }

    74     static void Log(const paramType& aParam, std::wstring* aLog)

    75     {

    76         // TODO

    77         aLog->append(L"(XEvent)");

    78     }

    80 #ifdef MOZ_X11

    81 private:

    82     static void SetXDisplay(XEvent& ev)

    83     {

    84         Display* display = mozilla::DefaultXDisplay();

    85         if (ev.type >= KeyPress) {

    86             ev.xany.display = display;

    87         }

    88         else {

    89             // XXX assuming that this is an error event

    90             // (type == 0? not clear from Xlib.h)

    91             ev.xerror.display = display;

    92         }

    93     }

    94 #endif

    95 };

    97 } // namespace IPC

   100 #endif // ifndef mozilla_dom_plugins_NPEventX11_h

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