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kwin/composite.cpp
Martin Flöser cbbe94d769 Restrict available supported compositors based on first initialized one 
Summary:
On Wayland we cannot switch from OpenGL to QPainter compositor as this
would break any running OpenGL application. KWin registers it's
EGLDisplay to Wayland and without OpenGL this doesn't make sense any
more. We are not able to render OpenGL buffers in the QPainter
compositor.

While it's theoretically possible to switch from QPainter to OpenGL it
doesn't make any sense for the same reason. Any running OpenGL
application would be using llvmpipe and could not be switched to proper
OpenGL.

This change stores the selected compositing type in Platform and the
implementations can use it to restrict the supported compositors. On X11
we don't need this, all other Platforms implement the restriction. Thus
it's no longer possible to switch the backends at runtime.

Test Plan:
Adjusted tests run, no runtime test as gui doesn't support
switching to QPainter anyway.

Reviewers: kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D19084
2019-02-22 16:59:08 +01:00

1215 lines
38 KiB
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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 "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 "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 <kwingltexture.h>
#include <KWayland/Server/surface_interface.h>
#include <stdio.h>
#include <QtConcurrentRun>
#include <QFutureWatcher>
#include <QMenu>
#include <QTimerEvent>
#include <QDateTime>
#include <QOpenGLContext>
#include <QQuickWindow>
#include <KGlobalAccel>
#include <KLocalizedString>
#include <KPluginLoader>
#include <KPluginMetaData>
#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)
, m_finishing(false)
, m_starting(false)
, m_timeSinceLastVBlank(0)
, m_scene(NULL)
, m_bufferSwapPending(false)
, m_composeAtSwapCompletion(false)
{
qRegisterMetaType<Compositor::SuspendReason>("Compositor::SuspendReason");
connect(&compositeResetTimer, SIGNAL(timeout()), SLOT(restart()));
connect(options, &Options::configChanged, this, &Compositor::slotConfigChanged);
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;
}
);
if (qEnvironmentVariableIsSet("KWIN_MAX_FRAMES_TESTED"))
m_framesToTestForSafety = qEnvironmentVariableIntValue("KWIN_MAX_FRAMES_TESTED");
// register DBus
new CompositorDBusInterface(this);
}
Compositor::~Compositor()
{
emit aboutToDestroy();
finish();
deleteUnusedSupportProperties();
delete cm_selection;
s_compositor = NULL;
}
void Compositor::setup()
{
if (kwinApp()->isTerminating()) {
// don't setup while KWin is terminating. An event to restart might be lingering in the event queue due to graphics reset
return;
}
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();
}
extern int screen_number; // main.cpp
extern bool is_multihead;
void Compositor::slotCompositingOptionsInitialized()
{
setupX11Support();
// 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();
}
}
emit aboutToToggleCompositing();
auto supportedCompositors = kwinApp()->platform()->supportedCompositors();
const auto userConfigIt = std::find(supportedCompositors.begin(), supportedCompositors.end(), options->compositingMode());
if (userConfigIt != supportedCompositors.end()) {
supportedCompositors.erase(userConfigIt);
supportedCompositors.prepend(options->compositingMode());
} else {
qCWarning(KWIN_CORE) << "Configured compositor not supported by Platform. Falling back to defaults";
}
const auto availablePlugins = KPluginLoader::findPlugins(QStringLiteral("org.kde.kwin.scenes"));
for (auto type : qAsConst(supportedCompositors)) {
const auto pluginIt = std::find_if(availablePlugins.begin(), availablePlugins.end(),
[type] (const auto &plugin) {
const auto &metaData = plugin.rawData();
auto it = metaData.find(QStringLiteral("CompositingType"));
if (it != metaData.end()) {
if ((*it).toInt() == int{type}) {
return true;
}
}
return false;
});
if (pluginIt != availablePlugins.end()) {
std::unique_ptr<SceneFactory> factory{qobject_cast<SceneFactory*>(pluginIt->instantiate())};
if (factory) {
m_scene = factory->create(this);
if (m_scene) {
if (!m_scene->initFailed()) {
qCDebug(KWIN_CORE) << "Instantiated compositing plugin:" << pluginIt->name();
break;
} else {
delete m_scene;
m_scene = nullptr;
}
}
}
}
}
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 (!supportedCompositors.contains(NoCompositing)) {
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;
}
kwinApp()->platform()->setSelectedCompositor(m_scene->compositingType() & OpenGLCompositing ? OpenGLCompositing : m_scene->compositingType());
if (!Workspace::self() && m_scene && m_scene->compositingType() == QPainterCompositing) {
// Force Software QtQuick on first startup with QPainter
QQuickWindow::setSceneGraphBackend(QSGRendererInterface::Software);
}
connect(m_scene, &Scene::resetCompositing, this, &Compositor::restart);
emit sceneCreated();
if (Workspace::self()) {
startupWithWorkspace();
} else {
connect(kwinApp(), &Application::workspaceCreated, this, &Compositor::startupWithWorkspace);
}
}
void Compositor::claimCompositorSelection()
{
if (!cm_selection) {
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::setupX11Support()
{
auto c = kwinApp()->x11Connection();
if (!c) {
delete cm_selection;
cm_selection = nullptr;
return;
}
claimCompositorSelection();
xcb_composite_redirect_subwindows(c, kwinApp()->x11RootWindow(), XCB_COMPOSITE_REDIRECT_MANUAL);
}
void Compositor::startupWithWorkspace()
{
if (!m_starting) {
return;
}
connect(kwinApp(), &Application::x11ConnectionChanged, this, &Compositor::setupX11Support, Qt::UniqueConnection);
Workspace::self()->markXStackingOrderAsDirty();
Q_ASSERT(m_scene);
connect(workspace(), &Workspace::destroyed, this, [this] { compositeTimer.stop(); });
setupX11Support();
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();
kwinApp()->platform()->createEffectsHandler(this, m_scene); // sets also the 'effects' pointer
connect(Workspace::self(), &Workspace::deletedRemoved, m_scene, &Scene::removeToplevel);
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();
}
const auto internalClients = w->internalClients();
for (auto c : internalClients) {
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();
emit aboutToToggleCompositing();
// Some effects might need access to effect windows when they are about to
// be destroyed, for example to unreference deleted windows, so we have to
// make sure that effect windows outlive effects.
delete effects;
effects = nullptr;
if (Workspace::self()) {
foreach (Client * c, Workspace::self()->clientList())
m_scene->removeToplevel(c);
foreach (Client * c, Workspace::self()->desktopList())
m_scene->removeToplevel(c);
foreach (Unmanaged * c, Workspace::self()->unmanagedList())
m_scene->removeToplevel(c);
foreach (Deleted * c, Workspace::self()->deletedList())
m_scene->removeToplevel(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();
if (auto c = kwinApp()->x11Connection()) {
xcb_composite_unredirect_subwindows(c, kwinApp()->x11RootWindow(), XCB_COMPOSITE_REDIRECT_MANUAL);
}
}
if (waylandServer()) {
foreach (ShellClient *c, waylandServer()->clients()) {
m_scene->removeToplevel(c);
}
foreach (ShellClient *c, waylandServer()->internalClients()) {
m_scene->removeToplevel(c);
}
foreach (ShellClient *c, waylandServer()->clients()) {
c->finishCompositing();
}
foreach (ShellClient *c, waylandServer()->internalClients()) {
c->finishCompositing();
}
}
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 (const auto c = kwinApp()->x11Connection()) {
foreach (const xcb_atom_t &atom, m_unusedSupportProperties) {
// remove property from root window
xcb_delete_property(c, kwinApp()->x11RootWindow(), atom);
}
}
}
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;
emit bufferSwapCompleted();
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();
if (auto c = kwinApp()->x11Connection()) {
xcb_flush(c);
}
}
// 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();
if (m_framesToTestForSafety > 0 && (m_scene->compositingType() & OpenGLCompositing)) {
kwinApp()->platform()->createOpenGLSafePoint(Platform::OpenGLSafePoint::PreFrame);
}
m_timeSinceLastVBlank = m_scene->paint(repaints, windows);
if (m_framesToTestForSafety > 0) {
if (m_scene->compositingType() & OpenGLCompositing) {
kwinApp()->platform()->createOpenGLSafePoint(Platform::OpenGLSafePoint::PostFrame);
}
m_framesToTestForSafety--;
if (m_framesToTestForSafety == 0 && (m_scene->compositingType() & OpenGLCompositing)) {
kwinApp()->platform()->createOpenGLSafePoint(Platform::OpenGLSafePoint::PostLastGuardedFrame);
}
}
m_timeSinceStart += m_timeSinceLastVBlank;
if (waylandServer()) {
for (Toplevel *win : qAsConst(windows)) {
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();
}
}
template <class T>
static bool repaintsPending(const QList<T*> &windows)
{
return std::any_of(windows.begin(), windows.end(), [] (T *t) { return !t->repaints().isEmpty(); });
}
bool Compositor::windowRepaintsPending() const
{
if (repaintsPending(Workspace::self()->clientList())) {
return true;
}
if (repaintsPending(Workspace::self()->desktopList())) {
return true;
}
if (repaintsPending(Workspace::self()->unmanagedList())) {
return true;
}
if (repaintsPending(Workspace::self()->deletedList())) {
return true;
}
if (auto w = waylandServer()) {
const auto &clients = w->clients();
auto test = [] (ShellClient *c) {
return c->readyForPainting() && !c->repaints().isEmpty();
};
if (std::any_of(clients.begin(), clients.end(), test)) {
return true;
}
const auto &internalClients = w->internalClients();
auto internalTest = [] (ShellClient *c) {
return c->isShown(true) && !c->repaints().isEmpty();
};
if (std::any_of(internalClients.begin(), internalClients.end(), internalTest)) {
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();
}
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();
}
bool Compositor::isOverlayWindowVisible() const
{
if (!hasScene()) {
return false;
}
if (!m_scene->overlayWindow()) {
return false;
}
return m_scene->overlayWindow()->isVisible();
}
/*****************************************************
* 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);
Compositor::self()->scene()->addToplevel(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;
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) {
xcb_damage_destroy(connection(), damage_handle);
}
damage_handle = XCB_NONE;
damage_region = QRegion();
repaints_region = QRegion();
effect_window = NULL;
}
void Toplevel::discardWindowPixmap()
{
addDamageFull();
if (effectWindow() != NULL && effectWindow()->sceneWindow() != NULL)
effectWindow()->sceneWindow()->pixmapDiscarded();
}
void Toplevel::damageNotifyEvent()
{
m_isDamaged = true;
// Note: The rect is supposed to specify the damage extents,
// but we don't know it at this point. No one who connects
// to this signal uses the rect however.
emit damaged(this, QRect());
}
bool Toplevel::compositing() const
{
if (!Workspace::self()) {
return false;
}
return Workspace::self()->compositing();
}
void Client::damageNotifyEvent()
{
if (syncRequest.isPending && isResize()) {
emit damaged(this, QRect());
m_isDamaged = true;
return;
}
if (!ready_for_painting) { // avoid "setReadyForPainting()" function calling overhead
if (syncRequest.counter == XCB_NONE) { // cannot detect complete redraw, consider done now
setReadyForPainting();
setupWindowManagementInterface();
}
}
Toplevel::damageNotifyEvent();
}
bool Toplevel::resetAndFetchDamage()
{
if (!m_isDamaged)
return false;
if (damage_handle == XCB_NONE) {
m_isDamaged = false;
return true;
}
xcb_connection_t *conn = connection();
// Create a new region and copy the damage region to it,
// resetting the damaged state.
xcb_xfixes_region_t region = xcb_generate_id(conn);
xcb_xfixes_create_region(conn, region, 0, 0);
xcb_damage_subtract(conn, damage_handle, 0, region);
// Send a fetch-region request and destroy the region
m_regionCookie = xcb_xfixes_fetch_region_unchecked(conn, region);
xcb_xfixes_destroy_region(conn, region);
m_isDamaged = false;
m_damageReplyPending = true;
return m_damageReplyPending;
}
void Toplevel::getDamageRegionReply()
{
if (!m_damageReplyPending)
return;
m_damageReplyPending = false;
// Get the fetch-region reply
xcb_xfixes_fetch_region_reply_t *reply =
xcb_xfixes_fetch_region_reply(connection(), m_regionCookie, 0);
if (!reply)
return;
// Convert the reply to a QRegion
int count = xcb_xfixes_fetch_region_rectangles_length(reply);
QRegion region;
if (count > 1 && count < 16) {
xcb_rectangle_t *rects = xcb_xfixes_fetch_region_rectangles(reply);
QVector<QRect> qrects;
qrects.reserve(count);
for (int i = 0; i < count; i++)
qrects << QRect(rects[i].x, rects[i].y, rects[i].width, rects[i].height);
region.setRects(qrects.constData(), count);
} else
region += QRect(reply->extents.x, reply->extents.y,
reply->extents.width, reply->extents.height);
damage_region += region;
repaints_region += region;
free(reply);
}
void Toplevel::addDamageFull()
{
if (!compositing())
return;
damage_region = rect();
repaints_region |= rect();
emit damaged(this, rect());
}
void Toplevel::resetDamage()
{
damage_region = QRegion();
}
void Toplevel::addRepaint(const QRect& r)
{
if (!compositing()) {
return;
}
repaints_region += r;
emit needsRepaint();
}
void Toplevel::addRepaint(int x, int y, int w, int h)
{
QRect r(x, y, w, h);
addRepaint(r);
}
void Toplevel::addRepaint(const QRegion& r)
{
if (!compositing()) {
return;
}
repaints_region += r;
emit needsRepaint();
}
void Toplevel::addLayerRepaint(const QRect& r)
{
if (!compositing()) {
return;
}
layer_repaints_region += r;
emit needsRepaint();
}
void Toplevel::addLayerRepaint(int x, int y, int w, int h)
{
QRect r(x, y, w, h);
addLayerRepaint(r);
}
void Toplevel::addLayerRepaint(const QRegion& r)
{
if (!compositing())
return;
layer_repaints_region += r;
emit needsRepaint();
}
void Toplevel::addRepaintFull()
{
repaints_region = visibleRect().translated(-pos());
emit needsRepaint();
}
void Toplevel::resetRepaints()
{
repaints_region = QRegion();
layer_repaints_region = QRegion();
}
void Toplevel::addWorkspaceRepaint(int x, int y, int w, int h)
{
addWorkspaceRepaint(QRect(x, y, w, h));
}
void Toplevel::addWorkspaceRepaint(const QRect& r2)
{
if (!compositing())
return;
Compositor::self()->addRepaint(r2);
}
//****************************************
// Client
//****************************************
bool Client::setupCompositing()
{
if (!Toplevel::setupCompositing()){
return false;
}
updateVisibility(); // for internalKeep()
return true;
}
void Client::finishCompositing(ReleaseReason releaseReason)
{
Toplevel::finishCompositing(releaseReason);
updateVisibility();
// for safety in case KWin is just resizing the window
resetHaveResizeEffect();
}
} // namespace
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