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barrier/lib/platform/CXWindowsScreen.cpp

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/*
* synergy -- mouse and keyboard sharing utility
* Copyright (C) 2002 Chris Schoeneman
*
* This package is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* found in the file COPYING that should have accompanied this file.
*
* This package 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.
*/
#include "CXWindowsScreen.h"
#include "CXWindowsClipboard.h"
#include "CXWindowsScreenSaver.h"
#include "CXWindowsUtil.h"
#include "CClipboard.h"
#include "IScreenEventHandler.h"
#include "IScreenReceiver.h"
#include "XScreen.h"
#include "CLock.h"
#include "CThread.h"
#include "CLog.h"
#include "IJob.h"
#include <cstring>
#if defined(X_DISPLAY_MISSING)
# error X11 is required to build synergy
#else
# include <X11/X.h>
# include <X11/Xutil.h>
#endif
#if UNIX_LIKE
#include <sys/poll.h>
#endif
//
// CXWindowsScreen::CTimer
//
CXWindowsScreen::CTimer::CTimer(IJob* job, double timeout) :
m_job(job),
m_timeout(timeout)
{
assert(m_job != NULL);
assert(m_timeout > 0.0);
reset();
}
CXWindowsScreen::CTimer::~CTimer()
{
// do nothing
}
void
CXWindowsScreen::CTimer::run()
{
m_job->run();
}
void
CXWindowsScreen::CTimer::reset()
{
m_time = m_timeout;
}
CXWindowsScreen::CTimer::CTimer&
CXWindowsScreen::CTimer::operator-=(double dt)
{
m_time -= dt;
return *this;
}
CXWindowsScreen::CTimer::operator double() const
{
return m_time;
}
bool
CXWindowsScreen::CTimer::operator<(const CTimer& t) const
{
return m_time < t.m_time;
}
//
// CXWindowsScreen
//
CXWindowsScreen* CXWindowsScreen::s_screen = NULL;
CXWindowsScreen::CXWindowsScreen(IScreenReceiver* receiver,
IScreenEventHandler* eventHandler) :
m_display(NULL),
m_root(None),
m_stop(false),
m_receiver(receiver),
m_eventHandler(eventHandler),
m_window(None),
m_x(0), m_y(0),
m_w(0), m_h(0),
m_screensaver(NULL),
m_screensaverNotify(false),
m_atomScreensaver(None)
{
assert(s_screen == NULL);
assert(m_receiver != NULL);
assert(m_eventHandler != NULL);
s_screen = this;
// no clipboards to start with
for (ClipboardID id = 0; id < kClipboardEnd; ++id) {
m_clipboard[id] = NULL;
}
}
CXWindowsScreen::~CXWindowsScreen()
{
assert(s_screen != NULL);
assert(m_display == NULL);
s_screen = NULL;
}
void
CXWindowsScreen::addTimer(IJob* job, double timeout)
{
CLock lock(&m_timersMutex);
removeTimerNoLock(job);
m_timers.push(CTimer(job, timeout));
}
void
CXWindowsScreen::removeTimer(IJob* job)
{
CLock lock(&m_timersMutex);
removeTimerNoLock(job);
}
void
CXWindowsScreen::removeTimerNoLock(IJob* job)
{
// do it the hard way. first collect all jobs that are not
// the removed job.
CTimerPriorityQueue::container_type tmp;
for (CTimerPriorityQueue::iterator index = m_timers.begin();
index != m_timers.end(); ++index) {
if (index->getJob() != job) {
tmp.push_back(*index);
}
}
// now swap in the new list
m_timers.swap(tmp);
}
void
CXWindowsScreen::setWindow(Window window)
{
CLock lock(&m_mutex);
assert(m_display != NULL);
// destroy the clipboards
for (ClipboardID id = 0; id < kClipboardEnd; ++id) {
delete m_clipboard[id];
m_clipboard[id] = NULL;
}
// save the new window
m_window = window;
// initialize the clipboards
if (m_window != None) {
for (ClipboardID id = 0; id < kClipboardEnd; ++id) {
m_clipboard[id] = new CXWindowsClipboard(m_display, m_window, id);
}
}
}
Window
CXWindowsScreen::getRoot() const
{
assert(m_display != NULL);
return m_root;
}
Cursor
CXWindowsScreen::getBlankCursor() const
{
return m_cursor;
}
void
CXWindowsScreen::open()
{
assert(m_display == NULL);
// set the X I/O error handler so we catch the display disconnecting
XSetIOErrorHandler(&CXWindowsScreen::ioErrorHandler);
// get the DISPLAY
const char* display = getenv("DISPLAY");
if (display == NULL) {
display = ":0.0";
}
// open the display
LOG((CLOG_DEBUG "XOpenDisplay(\"%s\")", display));
m_display = XOpenDisplay(display);
if (m_display == NULL) {
throw XScreenUnavailable(60.0);
}
// get root window
m_root = DefaultRootWindow(m_display);
// create the transparent cursor
createBlankCursor();
// get screen shape
updateScreenShape();
// initialize the screen saver
m_atomScreensaver = XInternAtom(m_display, "SCREENSAVER", False);
m_screensaver = new CXWindowsScreenSaver(this, m_display);
}
void
CXWindowsScreen::mainLoop()
{
// wait for an event in a cancellable way and don't lock the
// display while we're waiting.
CEvent event;
m_mutex.lock();
#if UNIX_LIKE
// use poll() to wait for a message from the X server or for timeout.
// this is a good deal more efficient than polling and sleeping.
struct pollfd pfds[1];
pfds[0].fd = ConnectionNumber(m_display);
pfds[0].events = POLLIN;
while (!m_stop) {
// compute timeout to next timer
int timeout = (m_timers.empty() ? -1 :
static_cast<int>(1000.0 * m_timers.top()));
// wait for message from X server or for timeout. also check
// if the thread has been cancelled. poll() should return -1
// with EINTR when the thread is cancelled.
m_mutex.unlock();
poll(pfds, 1, timeout);
CThread::testCancel();
m_mutex.lock();
// process timers
processTimers();
// handle pending events
while (!m_stop && XPending(m_display) > 0) {
// get the event
XNextEvent(m_display, &event.m_event);
// process the event. if unhandled then let the subclass
// have a go at it.
m_mutex.unlock();
if (!onPreDispatch(&event)) {
m_eventHandler->onEvent(&event);
}
m_mutex.lock();
}
}
#else // !UNIX_LIKE
// poll and sleep
while (!m_stop) {
// poll for pending events and process timers
while (!m_stop && XPending(m_display) == 0) {
// check timers
if (processTimers()) {
continue;
}
// wait
m_mutex.unlock();
CThread::sleep(0.01);
m_mutex.lock();
}
// process events
while (!m_stop && XPending(m_display) > 0) {
// get the event
XNextEvent(m_display, &event.m_event);
// process the event. if unhandled then let the subclass
// have a go at it.
m_mutex.unlock();
if (!onPreDispatch(&event)) {
m_eventHandler->onEvent(&event);
}
m_mutex.lock();
}
}
#endif // !UNIX_LIKE
m_mutex.unlock();
}
void
CXWindowsScreen::exitMainLoop()
{
CLock lock(&m_mutex);
m_stop = true;
}
void
CXWindowsScreen::close()
{
CLock lock(&m_mutex);
// done with screen saver
delete m_screensaver;
m_screensaver = NULL;
// destroy clipboards
for (ClipboardID id = 0; id < kClipboardEnd; ++id) {
delete m_clipboard[id];
m_clipboard[id] = NULL;
}
// close the display
if (m_display != NULL) {
XCloseDisplay(m_display);
m_display = NULL;
LOG((CLOG_DEBUG "closed display"));
}
XSetIOErrorHandler(NULL);
}
bool
CXWindowsScreen::setClipboard(ClipboardID id, const IClipboard* clipboard)
{
CLock lock(&m_mutex);
// fail if we don't have the requested clipboard
if (m_clipboard[id] == NULL) {
return false;
}
// get the actual time. ICCCM does not allow CurrentTime.
Time timestamp = CXWindowsUtil::getCurrentTime(
m_display, m_clipboard[id]->getWindow());
if (clipboard != NULL) {
// save clipboard data
return CClipboard::copy(m_clipboard[id], clipboard, timestamp);
}
else {
// assert clipboard ownership
if (!m_clipboard[id]->open(timestamp)) {
return false;
}
m_clipboard[id]->empty();
m_clipboard[id]->close();
return true;
}
}
void
CXWindowsScreen::checkClipboards()
{
// do nothing, we're always up to date
}
void
CXWindowsScreen::openScreensaver(bool notify)
{
CLock lock(&m_mutex);
assert(m_screensaver != NULL);
m_screensaverNotify = notify;
if (m_screensaverNotify) {
m_screensaver->setNotify(m_window);
}
else {
m_screensaver->disable();
}
}
void
CXWindowsScreen::closeScreensaver()
{
CLock lock(&m_mutex);
if (m_screensaver != NULL) {
if (m_screensaverNotify) {
m_screensaver->setNotify(None);
}
else {
m_screensaver->enable();
}
}
}
void
CXWindowsScreen::screensaver(bool activate)
{
CLock lock(&m_mutex);
assert(m_screensaver != NULL);
if (activate) {
m_screensaver->activate();
}
else {
m_screensaver->deactivate();
}
}
void
CXWindowsScreen::syncDesktop()
{
// do nothing; X doesn't suffer from this bogosity
}
bool
CXWindowsScreen::getClipboard(ClipboardID id, IClipboard* clipboard) const
{
assert(clipboard != NULL);
// block others from using the display while we get the clipboard
CLock lock(&m_mutex);
// fail if we don't have the requested clipboard
if (m_clipboard[id] == NULL) {
return false;
}
// get the actual time. ICCCM does not allow CurrentTime.
Time timestamp = CXWindowsUtil::getCurrentTime(
m_display, m_clipboard[id]->getWindow());
// copy the clipboard
return CClipboard::copy(clipboard, m_clipboard[id], timestamp);
}
void
CXWindowsScreen::getShape(SInt32& x, SInt32& y, SInt32& w, SInt32& h) const
{
CLock lock(&m_mutex);
assert(m_display != NULL);
x = m_x;
y = m_y;
w = m_w;
h = m_h;
}
void
CXWindowsScreen::getCursorPos(SInt32& x, SInt32& y) const
{
CLock lock(&m_mutex);
assert(m_display != NULL);
Window root, window;
int mx, my, xWindow, yWindow;
unsigned int mask;
if (XQueryPointer(m_display, getRoot(), &root, &window,
&mx, &my, &xWindow, &yWindow, &mask)) {
x = mx;
y = my;
}
else {
getCursorCenter(x, y);
}
}
void
CXWindowsScreen::getCursorCenter(SInt32& x, SInt32& y) const
{
CLock lock(&m_mutex);
assert(m_display != NULL);
x = m_x + (m_w >> 1);
y = m_y + (m_h >> 1);
}
void
CXWindowsScreen::updateScreenShape()
{
m_x = 0;
m_y = 0;
m_w = WidthOfScreen(DefaultScreenOfDisplay(m_display));
m_h = HeightOfScreen(DefaultScreenOfDisplay(m_display));
LOG((CLOG_INFO "screen shape: %d,%d %dx%d", m_x, m_y, m_w, m_h));
}
bool
CXWindowsScreen::onPreDispatch(CEvent* event)
{
assert(event != NULL);
XEvent* xevent = &event->m_event;
switch (xevent->type) {
case MappingNotify:
// keyboard mapping changed
XRefreshKeyboardMapping(&xevent->xmapping);
// pass event on
break;
case SelectionClear:
{
// we just lost the selection. that means someone else
// grabbed the selection so this screen is now the
// selection owner. report that to the receiver.
ClipboardID id = getClipboardID(xevent->xselectionclear.selection);
if (id != kClipboardEnd) {
LOG((CLOG_DEBUG "lost clipboard %d ownership at time %d", id, xevent->xselectionclear.time));
m_clipboard[id]->lost(xevent->xselectionclear.time);
m_receiver->onGrabClipboard(id);
return true;
}
}
break;
case SelectionNotify:
// notification of selection transferred. we shouldn't
// get this here because we handle them in the selection
// retrieval methods. we'll just delete the property
// with the data (satisfying the usual ICCCM protocol).
if (xevent->xselection.property != None) {
CLock lock(&m_mutex);
XDeleteProperty(m_display,
xevent->xselection.requestor,
xevent->xselection.property);
}
return true;
case SelectionRequest:
{
// somebody is asking for clipboard data
ClipboardID id = getClipboardID(
xevent->xselectionrequest.selection);
if (id != kClipboardEnd) {
CLock lock(&m_mutex);
m_clipboard[id]->addRequest(
xevent->xselectionrequest.owner,
xevent->xselectionrequest.requestor,
xevent->xselectionrequest.target,
xevent->xselectionrequest.time,
xevent->xselectionrequest.property);
return true;
}
}
break;
case PropertyNotify:
// property delete may be part of a selection conversion
if (xevent->xproperty.state == PropertyDelete) {
processClipboardRequest(xevent->xproperty.window,
xevent->xproperty.time,
xevent->xproperty.atom);
return true;
}
break;
case ClientMessage:
if (xevent->xclient.message_type == m_atomScreensaver ||
xevent->xclient.format == 32) {
// screen saver activation/deactivation event
m_eventHandler->onScreensaver(xevent->xclient.data.l[0] != 0);
return true;
}
break;
case DestroyNotify:
// looks like one of the windows that requested a clipboard
// transfer has gone bye-bye.
destroyClipboardRequest(xevent->xdestroywindow.window);
// we don't know if the event was handled or not so continue
break;
}
// let screen saver have a go
{
CLock lock(&m_mutex);
m_screensaver->onPreDispatch(xevent);
}
return m_eventHandler->onPreDispatch(event);
}
void
CXWindowsScreen::createBlankCursor()
{
// this seems just a bit more complicated than really necessary
// get the closet cursor size to 1x1
unsigned int w, h;
XQueryBestCursor(m_display, m_root, 1, 1, &w, &h);
// make bitmap data for cursor of closet size. since the cursor
// is blank we can use the same bitmap for shape and mask: all
// zeros.
const int size = ((w + 7) >> 3) * h;
char* data = new char[size];
memset(data, 0, size);
// make bitmap
Pixmap bitmap = XCreateBitmapFromData(m_display, m_root, data, w, h);
// need an arbitrary color for the cursor
XColor color;
color.pixel = 0;
color.red = color.green = color.blue = 0;
color.flags = DoRed | DoGreen | DoBlue;
// make cursor from bitmap
m_cursor = XCreatePixmapCursor(m_display, bitmap, bitmap,
&color, &color, 0, 0);
// don't need bitmap or the data anymore
delete[] data;
XFreePixmap(m_display, bitmap);
}
bool
CXWindowsScreen::processTimers()
{
std::vector<IJob*> jobs;
{
CLock lock(&m_timersMutex);
// get current time
const double time = m_time.getTime();
// done if no timers have expired
if (m_timers.empty() || m_timers.top() > time) {
return false;
}
// subtract current time from all timers. note that this won't
// change the order of elements in the priority queue (except
// for floating point round off which we'll ignore).
for (CTimerPriorityQueue::iterator index = m_timers.begin();
index != m_timers.end(); ++index) {
(*index) -= time;
}
// process all timers at or below zero, saving the jobs
while (m_timers.top() <= 0.0) {
CTimer timer = m_timers.top();
jobs.push_back(timer.getJob());
timer.reset();
m_timers.pop();
m_timers.push(timer);
}
// reset the clock
m_time.reset();
}
// now run the jobs. note that if one of these jobs removes
// a timer later in the jobs list and deletes that job pointer
// then this will crash when it tries to run that job.
for (std::vector<IJob*>::iterator index = jobs.begin();
index != jobs.end(); ++index) {
(*index)->run();
}
}
ClipboardID
CXWindowsScreen::getClipboardID(Atom selection) const
{
for (ClipboardID id = 0; id < kClipboardEnd; ++id) {
if (m_clipboard[id] != NULL &&
m_clipboard[id]->getSelection() == selection) {
return id;
}
}
return kClipboardEnd;
}
void
CXWindowsScreen::processClipboardRequest(Window requestor,
Time time, Atom property)
{
CLock lock(&m_mutex);
// check every clipboard until one returns success
for (ClipboardID id = 0; id < kClipboardEnd; ++id) {
if (m_clipboard[id] != NULL &&
m_clipboard[id]->processRequest(requestor, time, property)) {
break;
}
}
}
void
CXWindowsScreen::destroyClipboardRequest(Window requestor)
{
CLock lock(&m_mutex);
// check every clipboard until one returns success
for (ClipboardID id = 0; id < kClipboardEnd; ++id) {
if (m_clipboard[id] != NULL &&
m_clipboard[id]->destroyRequest(requestor)) {
break;
}
}
}
int
CXWindowsScreen::ioErrorHandler(Display*)
{
// the display has disconnected, probably because X is shutting
// down. X forces us to exit at this point. that's arguably
// a flaw in X but, realistically, it's difficult to gracefully
// handle not having a Display* anymore. we'll simply log the
// error, notify the subclass (which must not use the display
// so we set it to NULL), and exit.
LOG((CLOG_WARN "X display has unexpectedly disconnected"));
s_screen->m_display = NULL;
s_screen->m_receiver->onError();
LOG((CLOG_CRIT "quiting due to X display disconnection"));
exit(17);
}
//
// CDisplayLock
//
CDisplayLock::CDisplayLock(const CXWindowsScreen* screen) :
m_mutex(&screen->m_mutex),
m_display(screen->m_display)
{
// note -- it's permitted for m_display to be NULL. that might
// happen if we couldn't connect to the display or if the
// display unexpectedly disconnected. the caller is expected
// to check for NULL as necessary.
m_mutex->lock();
}
CDisplayLock::~CDisplayLock()
{
m_mutex->unlock();
}
CDisplayLock::operator Display*() const
{
return m_display;
}
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