goldberg_emulator/overlay_experimental/linux/X11_Hook.cpp

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/*
* Copyright (C) 2019-2020 Nemirtingas
* This file is part of the ingame overlay project
*
* The ingame overlay project is free software; you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* The ingame overlay project 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with the ingame overlay project; if not, see
* <http://www.gnu.org/licenses/>.
*/
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#include "X11_Hook.h"
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#include <imgui.h>
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#include <backends/imgui_impl_x11.h>
#include <System/Library.h>
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extern int ImGui_ImplX11_EventHandler(XEvent &event);
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constexpr decltype(X11_Hook::DLL_NAME) X11_Hook::DLL_NAME;
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X11_Hook* X11_Hook::_inst = nullptr;
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bool X11_Hook::StartHook(std::function<bool(bool)>& _key_combination_callback)
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{
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if (!_Hooked)
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{
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void* hX11 = System::Library::GetLibraryHandle(DLL_NAME);
if (hX11 == nullptr)
{
SPDLOG_WARN("Failed to hook X11: Cannot find {}", DLL_NAME);
return false;
}
System::Library::Library libX11;
LibraryName = System::Library::GetLibraryPath(hX11);
if (!libX11.OpenLibrary(LibraryName, false))
{
SPDLOG_WARN("Failed to hook X11: Cannot load {}", LibraryName);
return false;
}
XEventsQueued = libX11.GetSymbol<decltype(::XEventsQueued)>("XEventsQueued");
XPending = libX11.GetSymbol<decltype(::XPending)>("XPending");
if (XPending == nullptr || XEventsQueued == nullptr)
{
SPDLOG_WARN("Failed to hook X11: Cannot load functions.({}, {})", DLL_NAME, (void*)XEventsQueued, (void*)XPending);
return false;
}
SPDLOG_INFO("Hooked X11");
_KeyCombinationCallback = std::move(_key_combination_callback);
_Hooked = true;
UnhookAll();
BeginHook();
HookFuncs(
std::make_pair<void**, void*>(&(void*&)XEventsQueued, (void*)&X11_Hook::MyXEventsQueued),
std::make_pair<void**, void*>(&(void*&)XPending, (void*)&X11_Hook::MyXPending)
);
EndHook();
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}
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return true;
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}
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void X11_Hook::ResetRenderState()
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{
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if (_Initialized)
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{
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_GameWnd = 0;
_Initialized = false;
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ImGui_ImplX11_Shutdown();
}
}
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bool X11_Hook::PrepareForOverlay(Display *display, Window wnd)
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{
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if(!_Hooked)
return false;
if (_GameWnd != wnd)
ResetRenderState();
if (!_Initialized)
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{
ImGui_ImplX11_Init(display, (void*)wnd);
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_GameWnd = wnd;
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_Initialized = true;
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}
ImGui_ImplX11_NewFrame();
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return true;
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}
/////////////////////////////////////////////////////////////////////////////////////
// X11 window hooks
bool IgnoreEvent(XEvent &event)
{
switch(event.type)
{
// Keyboard
case KeyPress: case KeyRelease:
// MouseButton
case ButtonPress: case ButtonRelease:
// Mouse move
case MotionNotify:
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// Copy to clipboard request
case SelectionRequest:
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return true;
}
return false;
}
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int X11_Hook::_CheckForOverlay(Display *d, int num_events)
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{
static Time prev_time = {};
X11_Hook* inst = Inst();
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if( inst->_Initialized )
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{
XEvent event;
while(num_events)
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{
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bool skip_input = inst->_KeyCombinationCallback(false);
XPeekEvent(d, &event);
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ImGui_ImplX11_EventHandler(event);
// Is the event is a key press
if (event.type == KeyPress)
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{
// Tab is pressed and was not pressed before
if (event.xkey.keycode == XKeysymToKeycode(d, XK_Tab) && event.xkey.state & ShiftMask)
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{
// if key TAB is held, don't make the overlay flicker :p
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if (event.xkey.time != prev_time)
{
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skip_input = true;
inst->_KeyCombinationCallback(true);
}
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}
}
else if(event.type == KeyRelease && event.xkey.keycode == XKeysymToKeycode(d, XK_Tab))
{
prev_time = event.xkey.time;
}
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if (!skip_input || !IgnoreEvent(event))
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{
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if(num_events)
num_events = 1;
break;
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}
XNextEvent(d, &event);
--num_events;
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}
}
return num_events;
}
int X11_Hook::MyXEventsQueued(Display *display, int mode)
{
X11_Hook* inst = X11_Hook::Inst();
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int res = inst->XEventsQueued(display, mode);
if( res )
{
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res = inst->_CheckForOverlay(display, res);
}
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return res;
}
int X11_Hook::MyXPending(Display* display)
{
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int res = Inst()->XPending(display);
if( res )
{
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res = Inst()->_CheckForOverlay(display, res);
}
return res;
}
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/////////////////////////////////////////////////////////////////////////////////////
X11_Hook::X11_Hook() :
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_Initialized(false),
_Hooked(false),
_GameWnd(0),
XEventsQueued(nullptr),
XPending(nullptr)
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{
}
X11_Hook::~X11_Hook()
{
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SPDLOG_INFO("X11 Hook removed");
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ResetRenderState();
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_inst = nullptr;
}
X11_Hook* X11_Hook::Inst()
{
if (_inst == nullptr)
_inst = new X11_Hook;
return _inst;
}
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std::string X11_Hook::GetLibraryName() const
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{
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return LibraryName;
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}