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composite.cpp
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composite.cpp
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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2006 Lubos Lunak <l.lunak@kde.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#include "composite.h"
#include "abstract_egl_backend.h"
#include "dbusinterface.h"
#include "utils.h"
#include <QTextStream>
#include "workspace.h"
#include "client.h"
#include "unmanaged.h"
#include "deleted.h"
#include "effects.h"
#include "overlaywindow.h"
#include "scene.h"
#include "scene_xrender.h"
#include "scene_opengl.h"
#include "scene_qpainter.h"
#include "screens.h"
#include "shadow.h"
#include "useractions.h"
#include "xcbutils.h"
#include "platform.h"
#include "shell_client.h"
#include "wayland_server.h"
#include "decorations/decoratedclient.h"
#include <KWayland/Server/surface_interface.h>
#include <stdio.h>
#include <QtConcurrentRun>
#include <QFutureWatcher>
#include <QMenu>
#include <QTimerEvent>
#include <QDateTime>
#include <QOpenGLContext>
#include <KGlobalAccel>
#include <KLocalizedString>
#include <KNotification>
#include <KSelectionWatcher>
#include <xcb/composite.h>
#include <xcb/damage.h>
Q_DECLARE_METATYPE(KWin::Compositor::SuspendReason)
namespace KWin
{
extern int currentRefreshRate();
CompositorSelectionOwner::CompositorSelectionOwner(const char *selection) : KSelectionOwner(selection, connection(), rootWindow()), owning(false)
{
connect (this, SIGNAL(lostOwnership()), SLOT(looseOwnership()));
}
void CompositorSelectionOwner::looseOwnership()
{
owning = false;
}
KWIN_SINGLETON_FACTORY_VARIABLE(Compositor, s_compositor)
static inline qint64 milliToNano(int milli) { return qint64(milli) * 1000 * 1000; }
static inline qint64 nanoToMilli(int nano) { return nano / (1000*1000); }
Compositor::Compositor(QObject* workspace)
: QObject(workspace)
, m_suspended(options->isUseCompositing() ? NoReasonSuspend : UserSuspend)
, cm_selection(NULL)
, vBlankInterval(0)
, fpsInterval(0)
, m_xrrRefreshRate(0)
, forceUnredirectCheck(false)
, m_finishing(false)
, m_timeSinceLastVBlank(0)
, m_scene(NULL)
, m_bufferSwapPending(false)
, m_composeAtSwapCompletion(false)
{
qRegisterMetaType<Compositor::SuspendReason>("Compositor::SuspendReason");
connect(&unredirectTimer, SIGNAL(timeout()), SLOT(delayedCheckUnredirect()));
connect(&compositeResetTimer, SIGNAL(timeout()), SLOT(restart()));
connect(options, &Options::configChanged, this, &Compositor::slotConfigChanged);
connect(options, SIGNAL(unredirectFullscreenChanged()), SLOT(delayedCheckUnredirect()));
unredirectTimer.setSingleShot(true);
compositeResetTimer.setSingleShot(true);
nextPaintReference.invalidate(); // Initialize the timer
// 2 sec which should be enough to restart the compositor
static const int compositorLostMessageDelay = 2000;
m_releaseSelectionTimer.setSingleShot(true);
m_releaseSelectionTimer.setInterval(compositorLostMessageDelay);
connect(&m_releaseSelectionTimer, SIGNAL(timeout()), SLOT(releaseCompositorSelection()));
m_unusedSupportPropertyTimer.setInterval(compositorLostMessageDelay);
m_unusedSupportPropertyTimer.setSingleShot(true);
connect(&m_unusedSupportPropertyTimer, SIGNAL(timeout()), SLOT(deleteUnusedSupportProperties()));
// delay the call to setup by one event cycle
// The ctor of this class is invoked from the Workspace ctor, that means before
// Workspace is completely constructed, so calling Workspace::self() would result
// in undefined behavior. This is fixed by using a delayed invocation.
if (kwinApp()->platform()->isReady()) {
QMetaObject::invokeMethod(this, "setup", Qt::QueuedConnection);
}
connect(kwinApp()->platform(), &Platform::readyChanged, this,
[this] (bool ready) {
if (ready) {
setup();
} else {
finish();
}
}, Qt::QueuedConnection
);
connect(kwinApp(), &Application::x11ConnectionAboutToBeDestroyed, this,
[this] {
delete cm_selection;
cm_selection = nullptr;
}
);
// register DBus
new CompositorDBusInterface(this);
}
Compositor::~Compositor()
{
emit aboutToDestroy();
AbstractEglBackend::unbindWaylandDisplay();
finish();
deleteUnusedSupportProperties();
delete cm_selection;
s_compositor = NULL;
}
void Compositor::setup()
{
if (hasScene())
return;
if (m_suspended) {
QStringList reasons;
if (m_suspended & UserSuspend) {
reasons << QStringLiteral("Disabled by User");
}
if (m_suspended & BlockRuleSuspend) {
reasons << QStringLiteral("Disabled by Window");
}
if (m_suspended & ScriptSuspend) {
reasons << QStringLiteral("Disabled by Script");
}
qCDebug(KWIN_CORE) << "Compositing is suspended, reason:" << reasons;
return;
} else if (!kwinApp()->platform()->compositingPossible()) {
qCCritical(KWIN_CORE) << "Compositing is not possible";
return;
}
m_starting = true;
if (!options->isCompositingInitialized()) {
options->reloadCompositingSettings(true);
slotCompositingOptionsInitialized();
} else {
slotCompositingOptionsInitialized();
}
}
extern int screen_number; // main.cpp
extern bool is_multihead;
void Compositor::slotCompositingOptionsInitialized()
{
claimCompositorSelection();
// There might still be a deleted around, needs to be cleared before creating the scene (BUG 333275)
if (Workspace::self()) {
while (!Workspace::self()->deletedList().isEmpty()) {
Workspace::self()->deletedList().first()->discard();
}
}
switch(options->compositingMode()) {
case OpenGLCompositing: {
qCDebug(KWIN_CORE) << "Initializing OpenGL compositing";
// Some broken drivers crash on glXQuery() so to prevent constant KWin crashes:
if (kwinApp()->platform()->openGLCompositingIsBroken())
qCWarning(KWIN_CORE) << "KWin has detected that your OpenGL library is unsafe to use";
else {
kwinApp()->platform()->createOpenGLSafePoint(Platform::OpenGLSafePoint::PreInit);
m_scene = SceneOpenGL::createScene(this);
// TODO: Add 30 second delay to protect against screen freezes as well
kwinApp()->platform()->createOpenGLSafePoint(Platform::OpenGLSafePoint::PostInit);
if (m_scene && !m_scene->initFailed()) {
connect(static_cast<SceneOpenGL*>(m_scene), &SceneOpenGL::resetCompositing, this, &Compositor::restart);
break; // -->
}
delete m_scene;
m_scene = NULL;
}
// Do not Fall back to XRender - it causes problems when selfcheck fails during startup, but works later on
break;
}
#ifdef KWIN_HAVE_XRENDER_COMPOSITING
case XRenderCompositing:
qCDebug(KWIN_CORE) << "Initializing XRender compositing";
m_scene = SceneXrender::createScene(this);
break;
#endif
case QPainterCompositing:
qCDebug(KWIN_CORE) << "Initializing QPainter compositing";
m_scene = SceneQPainter::createScene(this);
break;
default:
qCDebug(KWIN_CORE) << "No compositing enabled";
m_starting = false;
if (cm_selection) {
cm_selection->owning = false;
cm_selection->release();
}
if (kwinApp()->platform()->requiresCompositing()) {
qCCritical(KWIN_CORE) << "The used windowing system requires compositing";
qCCritical(KWIN_CORE) << "We are going to quit KWin now as it is broken";
qApp->quit();
}
return;
}
if (m_scene == NULL || m_scene->initFailed()) {
qCCritical(KWIN_CORE) << "Failed to initialize compositing, compositing disabled";
delete m_scene;
m_scene = NULL;
m_starting = false;
if (cm_selection) {
cm_selection->owning = false;
cm_selection->release();
}
if (kwinApp()->platform()->requiresCompositing()) {
qCCritical(KWIN_CORE) << "The used windowing system requires compositing";
qCCritical(KWIN_CORE) << "We are going to quit KWin now as it is broken";
qApp->quit();
}
return;
}
emit sceneCreated();
if (Workspace::self()) {
startupWithWorkspace();
} else {
connect(kwinApp(), &Application::workspaceCreated, this, &Compositor::startupWithWorkspace);
}
}
void Compositor::claimCompositorSelection()
{
if (!cm_selection && kwinApp()->x11Connection()) {
char selection_name[ 100 ];
sprintf(selection_name, "_NET_WM_CM_S%d", Application::x11ScreenNumber());
cm_selection = new CompositorSelectionOwner(selection_name);
connect(cm_selection, SIGNAL(lostOwnership()), SLOT(finish()));
}
if (!cm_selection) // no X11 yet
return;
if (!cm_selection->owning) {
cm_selection->claim(true); // force claiming
cm_selection->owning = true;
}
}
void Compositor::startupWithWorkspace()
{
if (!m_starting) {
return;
}
Q_ASSERT(m_scene);
connect(workspace(), &Workspace::destroyed, this, [this] { compositeTimer.stop(); });
claimCompositorSelection();
m_xrrRefreshRate = KWin::currentRefreshRate();
fpsInterval = options->maxFpsInterval();
if (m_scene->syncsToVBlank()) { // if we do vsync, set the fps to the next multiple of the vblank rate
vBlankInterval = milliToNano(1000) / m_xrrRefreshRate;
fpsInterval = qMax((fpsInterval / vBlankInterval) * vBlankInterval, vBlankInterval);
} else
vBlankInterval = milliToNano(1); // no sync - DO NOT set "0", would cause div-by-zero segfaults.
m_timeSinceLastVBlank = fpsInterval - (options->vBlankTime() + 1); // means "start now" - we don't have even a slight idea when the first vsync will occur
scheduleRepaint();
xcb_composite_redirect_subwindows(connection(), rootWindow(), XCB_COMPOSITE_REDIRECT_MANUAL);
new EffectsHandlerImpl(this, m_scene); // sets also the 'effects' pointer
connect(Workspace::self(), &Workspace::deletedRemoved, m_scene, &Scene::windowDeleted);
connect(effects, SIGNAL(screenGeometryChanged(QSize)), SLOT(addRepaintFull()));
addRepaintFull();
foreach (Client * c, Workspace::self()->clientList()) {
c->setupCompositing();
c->getShadow();
}
foreach (Client * c, Workspace::self()->desktopList())
c->setupCompositing();
foreach (Unmanaged * c, Workspace::self()->unmanagedList()) {
c->setupCompositing();
c->getShadow();
}
if (auto w = waylandServer()) {
const auto clients = w->clients();
for (auto c : clients) {
c->setupCompositing();
c->getShadow();
}
}
emit compositingToggled(true);
m_starting = false;
if (m_releaseSelectionTimer.isActive()) {
m_releaseSelectionTimer.stop();
}
// render at least once
performCompositing();
}
void Compositor::scheduleRepaint()
{
if (!compositeTimer.isActive())
setCompositeTimer();
}
void Compositor::finish()
{
if (!hasScene())
return;
m_finishing = true;
m_releaseSelectionTimer.start();
if (Workspace::self()) {
foreach (Client * c, Workspace::self()->clientList())
m_scene->windowClosed(c, NULL);
foreach (Client * c, Workspace::self()->desktopList())
m_scene->windowClosed(c, NULL);
foreach (Unmanaged * c, Workspace::self()->unmanagedList())
m_scene->windowClosed(c, NULL);
foreach (Deleted * c, Workspace::self()->deletedList())
m_scene->windowDeleted(c);
foreach (Client * c, Workspace::self()->clientList())
c->finishCompositing();
foreach (Client * c, Workspace::self()->desktopList())
c->finishCompositing();
foreach (Unmanaged * c, Workspace::self()->unmanagedList())
c->finishCompositing();
foreach (Deleted * c, Workspace::self()->deletedList())
c->finishCompositing();
xcb_composite_unredirect_subwindows(connection(), rootWindow(), XCB_COMPOSITE_REDIRECT_MANUAL);
}
delete effects;
effects = NULL;
delete m_scene;
m_scene = NULL;
compositeTimer.stop();
repaints_region = QRegion();
if (Workspace::self()) {
for (ClientList::ConstIterator it = Workspace::self()->clientList().constBegin();
it != Workspace::self()->clientList().constEnd();
++it) {
// forward all opacity values to the frame in case there'll be other CM running
if ((*it)->opacity() != 1.0) {
NETWinInfo i(connection(), (*it)->frameId(), rootWindow(), 0, 0);
i.setOpacity(static_cast< unsigned long >((*it)->opacity() * 0xffffffff));
}
}
// discard all Deleted windows (#152914)
while (!Workspace::self()->deletedList().isEmpty())
Workspace::self()->deletedList().first()->discard();
}
m_finishing = false;
emit compositingToggled(false);
}
void Compositor::releaseCompositorSelection()
{
if (hasScene() && !m_finishing) {
// compositor is up and running again, no need to release the selection
return;
}
if (m_starting) {
// currently still starting the compositor, it might fail, so restart the timer to test again
m_releaseSelectionTimer.start();
return;
}
if (m_finishing) {
// still shutting down, a restart might follow, so restart the timer to test again
m_releaseSelectionTimer.start();
return;
}
qCDebug(KWIN_CORE) << "Releasing compositor selection";
if (cm_selection) {
cm_selection->owning = false;
cm_selection->release();
}
}
void Compositor::keepSupportProperty(xcb_atom_t atom)
{
m_unusedSupportProperties.removeAll(atom);
}
void Compositor::removeSupportProperty(xcb_atom_t atom)
{
m_unusedSupportProperties << atom;
m_unusedSupportPropertyTimer.start();
}
void Compositor::deleteUnusedSupportProperties()
{
if (m_starting) {
// currently still starting the compositor
m_unusedSupportPropertyTimer.start();
return;
}
if (m_finishing) {
// still shutting down, a restart might follow
m_unusedSupportPropertyTimer.start();
return;
}
if (kwinApp()->x11Connection()) {
foreach (const xcb_atom_t &atom, m_unusedSupportProperties) {
// remove property from root window
xcb_delete_property(connection(), rootWindow(), atom);
}
}
}
// OpenGL self-check failed, fallback to XRender
void Compositor::fallbackToXRenderCompositing()
{
finish();
KConfigGroup config(kwinApp()->config(), "Compositing");
config.writeEntry("Backend", "XRender");
config.sync();
options->setCompositingMode(XRenderCompositing);
setup();
}
void Compositor::slotConfigChanged()
{
if (!m_suspended) {
setup();
if (effects) // setupCompositing() may fail
effects->reconfigure();
addRepaintFull();
} else
finish();
}
void Compositor::slotReinitialize()
{
// Reparse config. Config options will be reloaded by setup()
kwinApp()->config()->reparseConfiguration();
// Restart compositing
finish();
// resume compositing if suspended
m_suspended = NoReasonSuspend;
options->setCompositingInitialized(false);
setup();
if (effects) { // setup() may fail
effects->reconfigure();
}
}
// for the shortcut
void Compositor::slotToggleCompositing()
{
if (kwinApp()->platform()->requiresCompositing()) {
// we are not allowed to turn on/off compositing
return;
}
if (m_suspended) { // direct user call; clear all bits
resume(AllReasonSuspend);
} else { // but only set the user one (sufficient to suspend)
suspend(UserSuspend);
}
}
void Compositor::updateCompositeBlocking()
{
updateCompositeBlocking(NULL);
}
void Compositor::updateCompositeBlocking(Client *c)
{
if (kwinApp()->platform()->requiresCompositing()) {
return;
}
if (c) { // if c == 0 we just check if we can resume
if (c->isBlockingCompositing()) {
if (!(m_suspended & BlockRuleSuspend)) // do NOT attempt to call suspend(true); from within the eventchain!
QMetaObject::invokeMethod(this, "suspend", Qt::QueuedConnection, Q_ARG(Compositor::SuspendReason, BlockRuleSuspend));
}
}
else if (m_suspended & BlockRuleSuspend) { // lost a client and we're blocked - can we resume?
bool resume = true;
for (ClientList::ConstIterator it = Workspace::self()->clientList().constBegin(); it != Workspace::self()->clientList().constEnd(); ++it) {
if ((*it)->isBlockingCompositing()) {
resume = false;
break;
}
}
if (resume) { // do NOT attempt to call suspend(false); from within the eventchain!
QMetaObject::invokeMethod(this, "resume", Qt::QueuedConnection, Q_ARG(Compositor::SuspendReason, BlockRuleSuspend));
}
}
}
void Compositor::suspend(Compositor::SuspendReason reason)
{
if (kwinApp()->platform()->requiresCompositing()) {
return;
}
Q_ASSERT(reason != NoReasonSuspend);
m_suspended |= reason;
if (reason & KWin::Compositor::ScriptSuspend) {
// when disabled show a shortcut how the user can get back compositing
const auto shortcuts = KGlobalAccel::self()->shortcut(workspace()->findChild<QAction*>(QStringLiteral("Suspend Compositing")));
if (!shortcuts.isEmpty()) {
// display notification only if there is the shortcut
const QString message = i18n("Desktop effects have been suspended by another application.<br/>"
"You can resume using the '%1' shortcut.", shortcuts.first().toString(QKeySequence::NativeText));
KNotification::event(QStringLiteral("compositingsuspendeddbus"), message);
}
}
finish();
}
void Compositor::resume(Compositor::SuspendReason reason)
{
Q_ASSERT(reason != NoReasonSuspend);
m_suspended &= ~reason;
setup(); // signal "toggled" is eventually emitted from within setup
}
void Compositor::restart()
{
if (hasScene()) {
finish();
QTimer::singleShot(0, this, SLOT(setup()));
}
}
void Compositor::addRepaint(int x, int y, int w, int h)
{
if (!hasScene())
return;
repaints_region += QRegion(x, y, w, h);
scheduleRepaint();
}
void Compositor::addRepaint(const QRect& r)
{
if (!hasScene())
return;
repaints_region += r;
scheduleRepaint();
}
void Compositor::addRepaint(const QRegion& r)
{
if (!hasScene())
return;
repaints_region += r;
scheduleRepaint();
}
void Compositor::addRepaintFull()
{
if (!hasScene())
return;
const QSize &s = screens()->size();
repaints_region = QRegion(0, 0, s.width(), s.height());
scheduleRepaint();
}
void Compositor::timerEvent(QTimerEvent *te)
{
if (te->timerId() == compositeTimer.timerId()) {
performCompositing();
} else
QObject::timerEvent(te);
}
void Compositor::aboutToSwapBuffers()
{
assert(!m_bufferSwapPending);
m_bufferSwapPending = true;
}
void Compositor::bufferSwapComplete()
{
assert(m_bufferSwapPending);
m_bufferSwapPending = false;
if (m_composeAtSwapCompletion) {
m_composeAtSwapCompletion = false;
performCompositing();
}
}
void Compositor::performCompositing()
{
if (m_scene->usesOverlayWindow() && !isOverlayWindowVisible())
return; // nothing is visible anyway
// If a buffer swap is still pending, we return to the event loop and
// continue processing events until the swap has completed.
if (m_bufferSwapPending) {
m_composeAtSwapCompletion = true;
compositeTimer.stop();
return;
}
// If outputs are disabled, we return to the event loop and
// continue processing events until the outputs are enabled again
if (!kwinApp()->platform()->areOutputsEnabled()) {
compositeTimer.stop();
return;
}
// Create a list of all windows in the stacking order
ToplevelList windows = Workspace::self()->xStackingOrder();
ToplevelList damaged;
// Reset the damage state of each window and fetch the damage region
// without waiting for a reply
foreach (Toplevel *win, windows) {
if (win->resetAndFetchDamage())
damaged << win;
}
if (damaged.count() > 0) {
m_scene->triggerFence();
xcb_flush(connection());
}
// Move elevated windows to the top of the stacking order
foreach (EffectWindow *c, static_cast<EffectsHandlerImpl *>(effects)->elevatedWindows()) {
Toplevel* t = static_cast< EffectWindowImpl* >(c)->window();
windows.removeAll(t);
windows.append(t);
}
// Get the replies
foreach (Toplevel *win, damaged) {
// Discard the cached lanczos texture
if (win->effectWindow()) {
const QVariant texture = win->effectWindow()->data(LanczosCacheRole);
if (texture.isValid()) {
delete static_cast<GLTexture *>(texture.value<void*>());
win->effectWindow()->setData(LanczosCacheRole, QVariant());
}
}
win->getDamageRegionReply();
}
if (repaints_region.isEmpty() && !windowRepaintsPending()) {
m_scene->idle();
m_timeSinceLastVBlank = fpsInterval - (options->vBlankTime() + 1); // means "start now"
m_timeSinceStart += m_timeSinceLastVBlank;
// Note: It would seem here we should undo suspended unredirect, but when scenes need
// it for some reason, e.g. transformations or translucency, the next pass that does not
// need this anymore and paints normally will also reset the suspended unredirect.
// Otherwise the window would not be painted normally anyway.
compositeTimer.stop();
return;
}
// skip windows that are not yet ready for being painted and if screen is locked skip windows that are
// neither lockscreen nor inputmethod windows
// TODO ?
// this cannot be used so carelessly - needs protections against broken clients, the window
// should not get focus before it's displayed, handle unredirected windows properly and so on.
foreach (Toplevel *t, windows) {
if (!t->readyForPainting()) {
windows.removeAll(t);
}
if (waylandServer() && waylandServer()->isScreenLocked()) {
if(!t->isLockScreen() && !t->isInputMethod()) {
windows.removeAll(t);
}
}
}
QRegion repaints = repaints_region;
// clear all repaints, so that post-pass can add repaints for the next repaint
repaints_region = QRegion();
m_timeSinceLastVBlank = m_scene->paint(repaints, windows);
m_timeSinceStart += m_timeSinceLastVBlank;
if (waylandServer()) {
for (Toplevel *win : damaged) {
if (auto surface = win->surface()) {
surface->frameRendered(m_timeSinceStart);
}
}
}
compositeTimer.stop(); // stop here to ensure *we* cause the next repaint schedule - not some effect through m_scene->paint()
// Trigger at least one more pass even if there would be nothing to paint, so that scene->idle()
// is called the next time. If there would be nothing pending, it will not restart the timer and
// scheduleRepaint() would restart it again somewhen later, called from functions that
// would again add something pending.
if (m_bufferSwapPending && m_scene->syncsToVBlank()) {
m_composeAtSwapCompletion = true;
} else {
scheduleRepaint();
}
}
bool Compositor::windowRepaintsPending() const
{
foreach (Toplevel * c, Workspace::self()->clientList())
if (!c->repaints().isEmpty())
return true;
foreach (Toplevel * c, Workspace::self()->desktopList())
if (!c->repaints().isEmpty())
return true;
foreach (Toplevel * c, Workspace::self()->unmanagedList())
if (!c->repaints().isEmpty())
return true;
foreach (Toplevel * c, Workspace::self()->deletedList())
if (!c->repaints().isEmpty())
return true;
if (auto w = waylandServer()) {
const auto &clients = w->clients();
for (auto c : clients) {
if (c->readyForPainting() && !c->repaints().isEmpty()) {
return true;
}
}
const auto &internalClients = w->internalClients();
for (auto c : internalClients) {
if (c->isShown(true) && !c->repaints().isEmpty()) {
return true;
}
}
}
return false;
}
void Compositor::setCompositeResetTimer(int msecs)
{
compositeResetTimer.start(msecs);
}
void Compositor::setCompositeTimer()
{
if (!hasScene()) // should not really happen, but there may be e.g. some damage events still pending
return;
if (m_starting || !Workspace::self()) {
return;
}
// Don't start the timer if we're waiting for a swap event
if (m_bufferSwapPending && m_composeAtSwapCompletion)
return;
// Don't start the timer if all outputs are disabled
if (!kwinApp()->platform()->areOutputsEnabled()) {
return;
}
uint waitTime = 1;
if (m_scene->blocksForRetrace()) {
// TODO: make vBlankTime dynamic?!
// It's required because glXWaitVideoSync will *likely* block a full frame if one enters
// a retrace pass which can last a variable amount of time, depending on the actual screen
// Now, my ooold 19" CRT can do such retrace so that 2ms are entirely sufficient,
// while another ooold 15" TFT requires about 6ms
qint64 padding = m_timeSinceLastVBlank;
if (padding > fpsInterval) {
// we're at low repaints or spent more time in painting than the user wanted to wait for that frame
padding = vBlankInterval - (padding%vBlankInterval); // -> align to next vblank
} else { // -> align to the next maxFps tick
padding = ((vBlankInterval - padding%vBlankInterval) + (fpsInterval/vBlankInterval-1)*vBlankInterval);
// "remaining time of the first vsync" + "time for the other vsyncs of the frame"
}
if (padding < options->vBlankTime()) { // we'll likely miss this frame
waitTime = nanoToMilli(padding + vBlankInterval - options->vBlankTime()); // so we add one
} else {
waitTime = nanoToMilli(padding - options->vBlankTime());
}
}
else { // w/o blocking vsync we just jump to the next demanded tick
if (fpsInterval > m_timeSinceLastVBlank) {
waitTime = nanoToMilli(fpsInterval - m_timeSinceLastVBlank);
if (!waitTime) {
waitTime = 1; // will ensure we don't block out the eventloop - the system's just not faster ...
}
}/* else if (m_scene->syncsToVBlank() && m_timeSinceLastVBlank - fpsInterval < (vBlankInterval<<1)) {
// NOTICE - "for later" ------------------------------------------------------------------
// It can happen that we push two frames within one refresh cycle.
// Swapping will then block even with triple buffering when the GPU does not discard but
// queues frames
// now here's the mean part: if we take that as "OMG, we're late - next frame ASAP",
// there'll immediately be 2 frames in the pipe, swapping will block, we think we're
// late ... ewww
// so instead we pad to the clock again and add 2ms safety to ensure the pipe is really
// free
// NOTICE: obviously m_timeSinceLastVBlank can be too big because we're too slow as well
// So if this code was enabled, we'd needlessly half the framerate once more (15 instead of 30)
waitTime = nanoToMilli(vBlankInterval - (m_timeSinceLastVBlank - fpsInterval)%vBlankInterval) + 2;
}*/ else {
waitTime = 1; // ... "0" would be sufficient, but the compositor isn't the WMs only task
}
}
compositeTimer.start(qMin(waitTime, 250u), this); // force 4fps minimum
}
bool Compositor::isActive()
{
return !m_finishing && hasScene();
}
void Compositor::checkUnredirect()
{
checkUnredirect(false);
}
// force is needed when the list of windows changes (e.g. a window goes away)
void Compositor::checkUnredirect(bool force)
{
if (!hasScene() || !m_scene->overlayWindow() || m_scene->overlayWindow()->window() == None || !options->isUnredirectFullscreen())
return;
if (force)
forceUnredirectCheck = true;
if (!unredirectTimer.isActive())
unredirectTimer.start(0);
}
void Compositor::delayedCheckUnredirect()
{
if (!hasScene() || !m_scene->overlayWindow() || m_scene->overlayWindow()->window() == None || !(options->isUnredirectFullscreen() || sender() == options))
return;
ToplevelList list;
bool changed = forceUnredirectCheck;
foreach (Client * c, Workspace::self()->clientList())
list.append(c);
foreach (Unmanaged * c, Workspace::self()->unmanagedList())
list.append(c);
foreach (Toplevel * c, list) {
if (c->updateUnredirectedState()) {
changed = true;
break;
}
}
// no desktops, no Deleted ones
if (!changed)
return;
forceUnredirectCheck = false;
// Cut out parts from the overlay window where unredirected windows are,
// so that they are actually visible.
const QSize &s = screens()->size();
QRegion reg(0, 0, s.width(), s.height());
foreach (Toplevel * c, list) {
if (c->unredirected())
reg -= c->geometry();
}
m_scene->overlayWindow()->setShape(reg);
addRepaint(reg);
}
bool Compositor::checkForOverlayWindow(WId w) const
{
if (!hasScene()) {
// no scene, so it cannot be the overlay window
return false;
}
if (!m_scene->overlayWindow()) {
// no overlay window, it cannot be the overlay
return false;
}
// and compare the window ID's
return w == m_scene->overlayWindow()->window();
}
WId Compositor::overlayWindow() const
{
if (!hasScene()) {
return None;
}
if (!m_scene->overlayWindow()) {
return None;
}
return m_scene->overlayWindow()->window();
}
bool Compositor::isOverlayWindowVisible() const
{
if (!hasScene()) {
return false;
}
if (!m_scene->overlayWindow()) {
return false;
}
return m_scene->overlayWindow()->isVisible();
}
void Compositor::setOverlayWindowVisibility(bool visible)
{
if (hasScene() && m_scene->overlayWindow()) {
m_scene->overlayWindow()->setVisibility(visible);
}
}
/*****************************************************
* Workspace
****************************************************/
bool Workspace::compositing() const
{
return m_compositor && m_compositor->hasScene();
}
//****************************************
// Toplevel
//****************************************
bool Toplevel::setupCompositing()
{
if (!compositing())
return false;
if (damage_handle != XCB_NONE)
return false;
if (kwinApp()->operationMode() == Application::OperationModeX11 && !surface()) {
damage_handle = xcb_generate_id(connection());
xcb_damage_create(connection(), damage_handle, frameId(), XCB_DAMAGE_REPORT_LEVEL_NON_EMPTY);
}
damage_region = QRegion(0, 0, width(), height());
effect_window = new EffectWindowImpl(this);
unredirect = false;
Compositor::self()->checkUnredirect(true);
Compositor::self()->scene()->windowAdded(this);
// With unmanaged windows there is a race condition between the client painting the window
// and us setting up damage tracking. If the client wins we won't get a damage event even
// though the window has been painted. To avoid this we mark the whole window as damaged
// and schedule a repaint immediately after creating the damage object.
if (dynamic_cast<Unmanaged*>(this))
addDamageFull();
return true;
}
void Toplevel::finishCompositing(ReleaseReason releaseReason)
{
if (kwinApp()->operationMode() == Application::OperationModeX11 && damage_handle == XCB_NONE)
return;
Compositor::self()->checkUnredirect(true);
if (effect_window->window() == this) { // otherwise it's already passed to Deleted, don't free data
discardWindowPixmap();
delete effect_window;
}
if (damage_handle != XCB_NONE &&
releaseReason != ReleaseReason::Destroyed) {