File indexing completed on 2024-05-19 05:31:41

 /*
     KWin - the KDE window manager
     This file is part of the KDE project.
 
     SPDX-FileCopyrightText: 2006 Lubos Lunak <l.lunak@kde.org>
     SPDX-FileCopyrightText: 2009 Lucas Murray <lmurray@undefinedfire.com>
     SPDX-FileCopyrightText: 2018 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include "effect/effecthandler.h"
 
 #include "config-kwin.h"
 
 #include "compositor.h"
 #include "core/output.h"
 #include "core/renderbackend.h"
 #include "core/rendertarget.h"
 #include "core/renderviewport.h"
 #include "decorations/decorationbridge.h"
 #include "effect/effectloader.h"
 #include "effect/offscreenquickview.h"
 #include "effectsadaptor.h"
 #include "input.h"
 #include "input_event.h"
 #include "inputmethod.h"
 #include "inputpanelv1window.h"
 #include "keyboard_input.h"
 #include "opengl/glshader.h"
 #include "opengl/glshadermanager.h"
 #include "opengl/gltexture.h"
 #include "osd.h"
 #include "pointer_input.h"
 #include "scene/itemrenderer.h"
 #include "scene/windowitem.h"
 #include "scene/workspacescene.h"
 #include "screenedge.h"
 #include "scripting/scripting.h"
 #include "sm.h"
 #include "virtualdesktops.h"
 #include "wayland_server.h"
 #include "window_property_notify_x11_filter.h"
 #include "workspace.h"
 #include "x11window.h"
 
 #if KWIN_BUILD_ACTIVITIES
 #include "activities.h"
 #endif
 #if KWIN_BUILD_TABBOX
 #include "tabbox/tabbox.h"
 #endif
 #if KWIN_BUILD_SCREENLOCKER
 #include "screenlockerwatcher.h"
 #endif
 
 #include <KDecoration2/Decoration>
 #include <KDecoration2/DecorationSettings>
 
 #include <QFontMetrics>
 #include <QMatrix4x4>
 #include <QPainter>
 #include <QPixmap>
 #include <QTimeLine>
 #include <QVariant>
 #include <QWindow>
 #include <QtMath>
 
 namespace KWin
 {
 
 static QByteArray readWindowProperty(xcb_window_t win, xcb_atom_t atom, xcb_atom_t type, int format)
 {
     if (win == XCB_WINDOW_NONE) {
         return QByteArray();
     }
     uint32_t len = 32768;
     for (;;) {
         Xcb::Property prop(false, win, atom, XCB_ATOM_ANY, 0, len);
         if (prop.isNull()) {
             // get property failed
             return QByteArray();
         }
         if (prop->bytes_after > 0) {
             len *= 2;
             continue;
         }
         return prop.toByteArray(format, type);
     }
 }
 
 static xcb_atom_t registerSupportProperty(const QByteArray &propertyName)
 {
     auto c = kwinApp()->x11Connection();
     if (!c) {
         return XCB_ATOM_NONE;
     }
     // get the atom for the propertyName
     UniqueCPtr<xcb_intern_atom_reply_t> atomReply(xcb_intern_atom_reply(c,
                                                                         xcb_intern_atom_unchecked(c, false, propertyName.size(), propertyName.constData()),
                                                                         nullptr));
     if (!atomReply) {
         return XCB_ATOM_NONE;
     }
     // announce property on root window
     unsigned char dummy = 0;
     xcb_change_property(c, XCB_PROP_MODE_REPLACE, kwinApp()->x11RootWindow(), atomReply->atom, atomReply->atom, 8, 1, &dummy);
     // TODO: add to _NET_SUPPORTED
     return atomReply->atom;
 }
 
 //****************************************
 // EffectsHandler
 //****************************************
 
 EffectsHandler::EffectsHandler(Compositor *compositor, WorkspaceScene *scene)
     : keyboard_grab_effect(nullptr)
     , fullscreen_effect(nullptr)
     , compositing_type(compositor->backend()->compositingType())
     , m_compositor(compositor)
     , m_scene(scene)
     , m_effectLoader(new EffectLoader(this))
     , m_trackingCursorChanges(0)
 {
     if (compositing_type == NoCompositing) {
         return;
     }
     KWin::effects = this;
 
     qRegisterMetaType<QList<KWin::EffectWindow *>>();
     qRegisterMetaType<KWin::SessionState>();
     connect(m_effectLoader, &AbstractEffectLoader::effectLoaded, this, [this](Effect *effect, const QString &name) {
         effect_order.insert(effect->requestedEffectChainPosition(), EffectPair(name, effect));
         loaded_effects << EffectPair(name, effect);
         effectsChanged();
     });
     m_effectLoader->setConfig(kwinApp()->config());
     new EffectsAdaptor(this);
     QDBusConnection dbus = QDBusConnection::sessionBus();
     dbus.registerObject(QStringLiteral("/Effects"), this);
 
     connect(options, &Options::animationSpeedChanged, this, &EffectsHandler::reconfigureEffects);
 
     Workspace *ws = Workspace::self();
     VirtualDesktopManager *vds = VirtualDesktopManager::self();
     connect(ws, &Workspace::showingDesktopChanged, this, [this](bool showing, bool animated) {
         if (animated) {
             Q_EMIT showingDesktopChanged(showing);
         }
     });
     connect(ws, &Workspace::currentDesktopChanged, this, [this](VirtualDesktop *old, Window *window) {
         VirtualDesktop *newDesktop = VirtualDesktopManager::self()->currentDesktop();
         Q_EMIT desktopChanged(old, newDesktop, window ? window->effectWindow() : nullptr);
     });
     connect(ws, &Workspace::currentDesktopChanging, this, [this](VirtualDesktop *currentDesktop, QPointF offset, KWin::Window *window) {
         Q_EMIT desktopChanging(currentDesktop, offset, window ? window->effectWindow() : nullptr);
     });
     connect(ws, &Workspace::currentDesktopChangingCancelled, this, [this]() {
         Q_EMIT desktopChangingCancelled();
     });
     connect(ws, &Workspace::windowAdded, this, [this](Window *window) {
         setupWindowConnections(window);
         Q_EMIT windowAdded(window->effectWindow());
     });
     connect(ws, &Workspace::windowActivated, this, [this](Window *window) {
         Q_EMIT windowActivated(window ? window->effectWindow() : nullptr);
     });
     connect(ws, &Workspace::deletedRemoved, this, [this](KWin::Window *d) {
         Q_EMIT windowDeleted(d->effectWindow());
     });
     connect(ws->sessionManager(), &SessionManager::stateChanged, this, &KWin::EffectsHandler::sessionStateChanged);
     connect(vds, &VirtualDesktopManager::layoutChanged, this, [this](int width, int height) {
         Q_EMIT desktopGridSizeChanged(QSize(width, height));
         Q_EMIT desktopGridWidthChanged(width);
         Q_EMIT desktopGridHeightChanged(height);
     });
     connect(vds, &VirtualDesktopManager::desktopAdded, this, &EffectsHandler::desktopAdded);
     connect(vds, &VirtualDesktopManager::desktopRemoved, this, &EffectsHandler::desktopRemoved);
     connect(Cursors::self()->mouse(), &Cursor::mouseChanged, this, &EffectsHandler::mouseChanged);
     connect(ws, &Workspace::geometryChanged, this, &EffectsHandler::virtualScreenSizeChanged);
     connect(ws, &Workspace::geometryChanged, this, &EffectsHandler::virtualScreenGeometryChanged);
 #if KWIN_BUILD_ACTIVITIES
     if (Activities *activities = Workspace::self()->activities()) {
         connect(activities, &Activities::added, this, &EffectsHandler::activityAdded);
         connect(activities, &Activities::removed, this, &EffectsHandler::activityRemoved);
         connect(activities, &Activities::currentChanged, this, &EffectsHandler::currentActivityChanged);
     }
 #endif
     connect(ws, &Workspace::stackingOrderChanged, this, &EffectsHandler::stackingOrderChanged);
 #if KWIN_BUILD_TABBOX
     TabBox::TabBox *tabBox = workspace()->tabbox();
     connect(tabBox, &TabBox::TabBox::tabBoxAdded, this, &EffectsHandler::tabBoxAdded);
     connect(tabBox, &TabBox::TabBox::tabBoxUpdated, this, &EffectsHandler::tabBoxUpdated);
     connect(tabBox, &TabBox::TabBox::tabBoxClosed, this, &EffectsHandler::tabBoxClosed);
     connect(tabBox, &TabBox::TabBox::tabBoxKeyEvent, this, &EffectsHandler::tabBoxKeyEvent);
 #endif
     connect(workspace()->screenEdges(), &ScreenEdges::approaching, this, &EffectsHandler::screenEdgeApproaching);
 #if KWIN_BUILD_SCREENLOCKER
     connect(kwinApp()->screenLockerWatcher(), &ScreenLockerWatcher::locked, this, &EffectsHandler::screenLockingChanged);
     connect(kwinApp()->screenLockerWatcher(), &ScreenLockerWatcher::aboutToLock, this, &EffectsHandler::screenAboutToLock);
 #endif
 
     connect(kwinApp(), &Application::x11ConnectionChanged, this, [this]() {
         registered_atoms.clear();
         for (auto it = m_propertiesForEffects.keyBegin(); it != m_propertiesForEffects.keyEnd(); it++) {
             const auto atom = registerSupportProperty(*it);
             if (atom == XCB_ATOM_NONE) {
                 continue;
             }
             m_compositor->keepSupportProperty(atom);
             m_managedProperties.insert(*it, atom);
             registerPropertyType(atom, true);
         }
         if (kwinApp()->x11Connection()) {
             m_x11WindowPropertyNotify = std::make_unique<WindowPropertyNotifyX11Filter>(this);
         } else {
             m_x11WindowPropertyNotify.reset();
         }
         Q_EMIT xcbConnectionChanged();
     });
 
     if (kwinApp()->x11Connection()) {
         m_x11WindowPropertyNotify = std::make_unique<WindowPropertyNotifyX11Filter>(this);
     }
 
     // connect all clients
     for (Window *window : ws->windows()) {
         setupWindowConnections(window);
     }
 
     connect(ws, &Workspace::outputAdded, this, &EffectsHandler::screenAdded);
     connect(ws, &Workspace::outputRemoved, this, &EffectsHandler::screenRemoved);
 
     if (auto inputMethod = kwinApp()->inputMethod()) {
         connect(inputMethod, &InputMethod::panelChanged, this, &EffectsHandler::inputPanelChanged);
     }
 
     reconfigure();
 }
 
 EffectsHandler::~EffectsHandler()
 {
     unloadAllEffects();
     KWin::effects = nullptr;
 }
 
 xcb_window_t EffectsHandler::x11RootWindow() const
 {
     return kwinApp()->x11RootWindow();
 }
 
 xcb_connection_t *EffectsHandler::xcbConnection() const
 {
     return kwinApp()->x11Connection();
 }
 
 CompositingType EffectsHandler::compositingType() const
 {
     return compositing_type;
 }
 
 bool EffectsHandler::isOpenGLCompositing() const
 {
     return compositing_type & OpenGLCompositing;
 }
 
 void EffectsHandler::unloadAllEffects()
 {
     for (const EffectPair &pair : std::as_const(loaded_effects)) {
         destroyEffect(pair.second);
     }
 
     effect_order.clear();
     m_effectLoader->clear();
 
     effectsChanged();
 }
 
 void EffectsHandler::setupWindowConnections(Window *window)
 {
     connect(window, &Window::closed, this, [this, window]() {
         if (window->effectWindow()) {
             Q_EMIT windowClosed(window->effectWindow());
         }
     });
 }
 
 void EffectsHandler::reconfigure()
 {
     m_effectLoader->queryAndLoadAll();
 }
 
 // the idea is that effects call this function again which calls the next one
 void EffectsHandler::prePaintScreen(ScreenPrePaintData &data, std::chrono::milliseconds presentTime)
 {
     if (m_currentPaintScreenIterator != m_activeEffects.constEnd()) {
         (*m_currentPaintScreenIterator++)->prePaintScreen(data, presentTime);
         --m_currentPaintScreenIterator;
     }
     // no special final code
 }
 
 void EffectsHandler::paintScreen(const RenderTarget &renderTarget, const RenderViewport &viewport, int mask, const QRegion &region, Output *screen)
 {
     if (m_currentPaintScreenIterator != m_activeEffects.constEnd()) {
         (*m_currentPaintScreenIterator++)->paintScreen(renderTarget, viewport, mask, region, screen);
         --m_currentPaintScreenIterator;
     } else {
         m_scene->finalPaintScreen(renderTarget, viewport, mask, region, screen);
     }
 }
 
 void EffectsHandler::postPaintScreen()
 {
     if (m_currentPaintScreenIterator != m_activeEffects.constEnd()) {
         (*m_currentPaintScreenIterator++)->postPaintScreen();
         --m_currentPaintScreenIterator;
     }
     // no special final code
 }
 
 void EffectsHandler::prePaintWindow(EffectWindow *w, WindowPrePaintData &data, std::chrono::milliseconds presentTime)
 {
     if (m_currentPaintWindowIterator != m_activeEffects.constEnd()) {
         (*m_currentPaintWindowIterator++)->prePaintWindow(w, data, presentTime);
         --m_currentPaintWindowIterator;
     }
     // no special final code
 }
 
 void EffectsHandler::paintWindow(const RenderTarget &renderTarget, const RenderViewport &viewport, EffectWindow *w, int mask, const QRegion &region, WindowPaintData &data)
 {
     if (m_currentPaintWindowIterator != m_activeEffects.constEnd()) {
         (*m_currentPaintWindowIterator++)->paintWindow(renderTarget, viewport, w, mask, region, data);
         --m_currentPaintWindowIterator;
     } else {
         m_scene->finalPaintWindow(renderTarget, viewport, w, mask, region, data);
     }
 }
 
 void EffectsHandler::postPaintWindow(EffectWindow *w)
 {
     if (m_currentPaintWindowIterator != m_activeEffects.constEnd()) {
         (*m_currentPaintWindowIterator++)->postPaintWindow(w);
         --m_currentPaintWindowIterator;
     }
     // no special final code
 }
 
 Effect *EffectsHandler::provides(Effect::Feature ef)
 {
     for (int i = 0; i < loaded_effects.size(); ++i) {
         if (loaded_effects.at(i).second->provides(ef)) {
             return loaded_effects.at(i).second;
         }
     }
     return nullptr;
 }
 
 void EffectsHandler::drawWindow(const RenderTarget &renderTarget, const RenderViewport &viewport, EffectWindow *w, int mask, const QRegion &region, WindowPaintData &data)
 {
     if (m_currentDrawWindowIterator != m_activeEffects.constEnd()) {
         (*m_currentDrawWindowIterator++)->drawWindow(renderTarget, viewport, w, mask, region, data);
         --m_currentDrawWindowIterator;
     } else {
         m_scene->finalDrawWindow(renderTarget, viewport, w, mask, region, data);
     }
 }
 
 void EffectsHandler::renderWindow(const RenderTarget &renderTarget, const RenderViewport &viewport, EffectWindow *w, int mask, const QRegion &region, WindowPaintData &data)
 {
     m_scene->finalDrawWindow(renderTarget, viewport, w, mask, region, data);
 }
 
 bool EffectsHandler::hasDecorationShadows() const
 {
     return false;
 }
 
 bool EffectsHandler::decorationsHaveAlpha() const
 {
     return true;
 }
 
 // start another painting pass
 void EffectsHandler::startPaint()
 {
     m_activeEffects.clear();
     m_activeEffects.reserve(loaded_effects.count());
     for (QList<KWin::EffectPair>::const_iterator it = loaded_effects.constBegin(); it != loaded_effects.constEnd(); ++it) {
         if (it->second->isActive()) {
             m_activeEffects << it->second;
         }
     }
     m_currentDrawWindowIterator = m_activeEffects.constBegin();
     m_currentPaintWindowIterator = m_activeEffects.constBegin();
     m_currentPaintScreenIterator = m_activeEffects.constBegin();
 }
 
 void EffectsHandler::setActiveFullScreenEffect(Effect *e)
 {
     if (fullscreen_effect == e) {
         return;
     }
     const bool activeChanged = (e == nullptr || fullscreen_effect == nullptr);
     fullscreen_effect = e;
     Q_EMIT activeFullScreenEffectChanged();
     if (activeChanged) {
         Q_EMIT hasActiveFullScreenEffectChanged();
         workspace()->screenEdges()->checkBlocking();
     }
 }
 
 Effect *EffectsHandler::activeFullScreenEffect() const
 {
     return fullscreen_effect;
 }
 
 bool EffectsHandler::hasActiveFullScreenEffect() const
 {
     return fullscreen_effect;
 }
 
 bool EffectsHandler::grabKeyboard(Effect *effect)
 {
     if (keyboard_grab_effect != nullptr) {
         return false;
     }
     if (!doGrabKeyboard()) {
         return false;
     }
     keyboard_grab_effect = effect;
     return true;
 }
 
 bool EffectsHandler::doGrabKeyboard()
 {
     return true;
 }
 
 void EffectsHandler::ungrabKeyboard()
 {
     Q_ASSERT(keyboard_grab_effect != nullptr);
     doUngrabKeyboard();
     keyboard_grab_effect = nullptr;
     input()->keyboard()->update();
 }
 
 void EffectsHandler::doUngrabKeyboard()
 {
 }
 
 void EffectsHandler::grabbedKeyboardEvent(QKeyEvent *e)
 {
     if (keyboard_grab_effect != nullptr) {
         keyboard_grab_effect->grabbedKeyboardEvent(e);
     }
 }
 
 void EffectsHandler::startMouseInterception(Effect *effect, Qt::CursorShape shape)
 {
     if (m_grabbedMouseEffects.contains(effect)) {
         return;
     }
     m_grabbedMouseEffects.append(effect);
     if (m_grabbedMouseEffects.size() != 1) {
         return;
     }
     doStartMouseInterception(shape);
 }
 
 void EffectsHandler::doStartMouseInterception(Qt::CursorShape shape)
 {
     input()->pointer()->setEffectsOverrideCursor(shape);
 
     // We want to allow global shortcuts to be triggered when moving a
     // window so it is possible to pick up a window and then move it to a
     // different desktop by using the global shortcut to switch desktop.
     // However, that means that some other things can also be triggered. If
     // an effect that fill the screen gets triggered that way, we end up in a
     // weird state where the move will restart after the effect closes. So to
     // avoid that, abort move/resize if a full screen effect starts.
     if (workspace()->moveResizeWindow()) {
         workspace()->moveResizeWindow()->endInteractiveMoveResize();
     }
 }
 
 void EffectsHandler::stopMouseInterception(Effect *effect)
 {
     if (!m_grabbedMouseEffects.contains(effect)) {
         return;
     }
     m_grabbedMouseEffects.removeAll(effect);
     if (m_grabbedMouseEffects.isEmpty()) {
         doStopMouseInterception();
     }
 }
 
 void EffectsHandler::doStopMouseInterception()
 {
     input()->pointer()->removeEffectsOverrideCursor();
 }
 
 bool EffectsHandler::isMouseInterception() const
 {
     return m_grabbedMouseEffects.count() > 0;
 }
 
 bool EffectsHandler::touchDown(qint32 id, const QPointF &pos, std::chrono::microseconds time)
 {
     // TODO: reverse call order?
     for (auto it = loaded_effects.constBegin(); it != loaded_effects.constEnd(); ++it) {
         if (it->second->touchDown(id, pos, time)) {
             return true;
         }
     }
     return false;
 }
 
 bool EffectsHandler::touchMotion(qint32 id, const QPointF &pos, std::chrono::microseconds time)
 {
     // TODO: reverse call order?
     for (auto it = loaded_effects.constBegin(); it != loaded_effects.constEnd(); ++it) {
         if (it->second->touchMotion(id, pos, time)) {
             return true;
         }
     }
     return false;
 }
 
 bool EffectsHandler::touchUp(qint32 id, std::chrono::microseconds time)
 {
     // TODO: reverse call order?
     for (auto it = loaded_effects.constBegin(); it != loaded_effects.constEnd(); ++it) {
         if (it->second->touchUp(id, time)) {
             return true;
         }
     }
     return false;
 }
 
 bool EffectsHandler::tabletToolEvent(TabletEvent *event)
 {
     // TODO: reverse call order?
     for (auto it = loaded_effects.constBegin(); it != loaded_effects.constEnd(); ++it) {
         if (it->second->tabletToolEvent(event)) {
             return true;
         }
     }
     return false;
 }
 
 bool EffectsHandler::tabletToolButtonEvent(uint button, bool pressed, const TabletToolId &tabletToolId, std::chrono::microseconds time)
 {
     // TODO: reverse call order?
     for (auto it = loaded_effects.constBegin(); it != loaded_effects.constEnd(); ++it) {
         if (it->second->tabletToolButtonEvent(button, pressed, tabletToolId.m_uniqueId)) {
             return true;
         }
     }
     return false;
 }
 
 bool EffectsHandler::tabletPadButtonEvent(uint button, bool pressed, const TabletPadId &tabletPadId, std::chrono::microseconds time)
 {
     // TODO: reverse call order?
     for (auto it = loaded_effects.constBegin(); it != loaded_effects.constEnd(); ++it) {
         if (it->second->tabletPadButtonEvent(button, pressed, tabletPadId.data)) {
             return true;
         }
     }
     return false;
 }
 
 bool EffectsHandler::tabletPadStripEvent(int number, int position, bool isFinger, const TabletPadId &tabletPadId, std::chrono::microseconds time)
 {
     // TODO: reverse call order?
     for (auto it = loaded_effects.constBegin(); it != loaded_effects.constEnd(); ++it) {
         if (it->second->tabletPadStripEvent(number, position, isFinger, tabletPadId.data)) {
             return true;
         }
     }
     return false;
 }
 
 bool EffectsHandler::tabletPadRingEvent(int number, int position, bool isFinger, const TabletPadId &tabletPadId, std::chrono::microseconds time)
 {
     // TODO: reverse call order?
     for (auto it = loaded_effects.constBegin(); it != loaded_effects.constEnd(); ++it) {
         if (it->second->tabletPadRingEvent(number, position, isFinger, tabletPadId.data)) {
             return true;
         }
     }
     return false;
 }
 
 void EffectsHandler::registerPointerShortcut(Qt::KeyboardModifiers modifiers, Qt::MouseButton pointerButtons, QAction *action)
 {
     input()->registerPointerShortcut(modifiers, pointerButtons, action);
 }
 
 void EffectsHandler::registerAxisShortcut(Qt::KeyboardModifiers modifiers, PointerAxisDirection axis, QAction *action)
 {
     input()->registerAxisShortcut(modifiers, axis, action);
 }
 
 void EffectsHandler::registerTouchpadSwipeShortcut(SwipeDirection dir, uint fingerCount, QAction *onUp, std::function<void(qreal)> progressCallback)
 {
     input()->registerTouchpadSwipeShortcut(dir, fingerCount, onUp, progressCallback);
 }
 
 void EffectsHandler::registerTouchpadPinchShortcut(PinchDirection dir, uint fingerCount, QAction *onUp, std::function<void(qreal)> progressCallback)
 {
     input()->registerTouchpadPinchShortcut(dir, fingerCount, onUp, progressCallback);
 }
 
 void EffectsHandler::registerTouchscreenSwipeShortcut(SwipeDirection direction, uint fingerCount, QAction *action, std::function<void(qreal)> progressCallback)
 {
     input()->registerTouchscreenSwipeShortcut(direction, fingerCount, action, progressCallback);
 }
 
 void EffectsHandler::startMousePolling()
 {
     if (Cursors::self()->mouse()) {
         Cursors::self()->mouse()->startMousePolling();
     }
 }
 
 void EffectsHandler::stopMousePolling()
 {
     if (Cursors::self()->mouse()) {
         Cursors::self()->mouse()->stopMousePolling();
     }
 }
 
 bool EffectsHandler::hasKeyboardGrab() const
 {
     return keyboard_grab_effect != nullptr;
 }
 
 void EffectsHandler::registerPropertyType(long atom, bool reg)
 {
     if (reg) {
         ++registered_atoms[atom]; // initialized to 0 if not present yet
     } else {
         if (--registered_atoms[atom] == 0) {
             registered_atoms.remove(atom);
         }
     }
 }
 
 xcb_atom_t EffectsHandler::announceSupportProperty(const QByteArray &propertyName, Effect *effect)
 {
     PropertyEffectMap::iterator it = m_propertiesForEffects.find(propertyName);
     if (it != m_propertiesForEffects.end()) {
         // property has already been registered for an effect
         // just append Effect and return the atom stored in m_managedProperties
         if (!it.value().contains(effect)) {
             it.value().append(effect);
         }
         return m_managedProperties.value(propertyName, XCB_ATOM_NONE);
     }
     m_propertiesForEffects.insert(propertyName, QList<Effect *>() << effect);
     const auto atom = registerSupportProperty(propertyName);
     if (atom == XCB_ATOM_NONE) {
         return atom;
     }
     m_compositor->keepSupportProperty(atom);
     m_managedProperties.insert(propertyName, atom);
     registerPropertyType(atom, true);
     return atom;
 }
 
 void EffectsHandler::removeSupportProperty(const QByteArray &propertyName, Effect *effect)
 {
     PropertyEffectMap::iterator it = m_propertiesForEffects.find(propertyName);
     if (it == m_propertiesForEffects.end()) {
         // property is not registered - nothing to do
         return;
     }
     if (!it.value().contains(effect)) {
         // property is not registered for given effect - nothing to do
         return;
     }
     it.value().removeAll(effect);
     if (!it.value().isEmpty()) {
         // property still registered for another effect - nothing further to do
         return;
     }
     const xcb_atom_t atom = m_managedProperties.take(propertyName);
     registerPropertyType(atom, false);
     m_propertiesForEffects.remove(propertyName);
     m_compositor->removeSupportProperty(atom); // delayed removal
 }
 
 QByteArray EffectsHandler::readRootProperty(long atom, long type, int format) const
 {
     if (!kwinApp()->x11Connection()) {
         return QByteArray();
     }
     return readWindowProperty(kwinApp()->x11RootWindow(), atom, type, format);
 }
 
 void EffectsHandler::activateWindow(EffectWindow *effectWindow)
 {
     auto window = effectWindow->window();
     if (window->isClient()) {
         Workspace::self()->activateWindow(window, true);
     }
 }
 
 EffectWindow *EffectsHandler::activeWindow() const
 {
     return Workspace::self()->activeWindow() ? Workspace::self()->activeWindow()->effectWindow() : nullptr;
 }
 
 void EffectsHandler::moveWindow(EffectWindow *w, const QPoint &pos, bool snap, double snapAdjust)
 {
     auto window = w->window();
     if (!window->isClient() || !window->isMovable()) {
         return;
     }
 
     if (snap) {
         window->move(Workspace::self()->adjustWindowPosition(window, pos, true, snapAdjust));
     } else {
         window->move(pos);
     }
 }
 
 void EffectsHandler::windowToDesktops(EffectWindow *w, const QList<VirtualDesktop *> &desktops)
 {
     auto window = w->window();
     if (!window->isClient() || window->isDesktop() || window->isDock()) {
         return;
     }
     window->setDesktops(desktops);
 }
 
 void EffectsHandler::windowToScreen(EffectWindow *w, Output *screen)
 {
     auto window = w->window();
     if (window->isClient() && !window->isDesktop() && !window->isDock()) {
         Workspace::self()->sendWindowToOutput(window, screen);
     }
 }
 
 void EffectsHandler::setShowingDesktop(bool showing)
 {
     Workspace::self()->setShowingDesktop(showing);
 }
 
 QString EffectsHandler::currentActivity() const
 {
 #if KWIN_BUILD_ACTIVITIES
     if (!Workspace::self()->activities()) {
         return QString();
     }
     return Workspace::self()->activities()->current();
 #else
     return QString();
 #endif
 }
 
 VirtualDesktop *EffectsHandler::currentDesktop() const
 {
     return VirtualDesktopManager::self()->currentDesktop();
 }
 
 QList<VirtualDesktop *> EffectsHandler::desktops() const
 {
     return VirtualDesktopManager::self()->desktops();
 }
 
 void EffectsHandler::setCurrentDesktop(VirtualDesktop *desktop)
 {
     VirtualDesktopManager::self()->setCurrent(desktop);
 }
 
 QSize EffectsHandler::desktopGridSize() const
 {
     return VirtualDesktopManager::self()->grid().size();
 }
 
 int EffectsHandler::desktopGridWidth() const
 {
     return desktopGridSize().width();
 }
 
 int EffectsHandler::desktopGridHeight() const
 {
     return desktopGridSize().height();
 }
 
 int EffectsHandler::workspaceWidth() const
 {
     return desktopGridWidth() * Workspace::self()->geometry().width();
 }
 
 int EffectsHandler::workspaceHeight() const
 {
     return desktopGridHeight() * Workspace::self()->geometry().height();
 }
 
 VirtualDesktop *EffectsHandler::desktopAtCoords(QPoint coords) const
 {
     return VirtualDesktopManager::self()->grid().at(coords);
 }
 
 QPoint EffectsHandler::desktopGridCoords(VirtualDesktop *desktop) const
 {
     return VirtualDesktopManager::self()->grid().gridCoords(desktop);
 }
 
 QPoint EffectsHandler::desktopCoords(VirtualDesktop *desktop) const
 {
     QPoint coords = VirtualDesktopManager::self()->grid().gridCoords(desktop);
     if (coords.x() == -1) {
         return QPoint(-1, -1);
     }
     const QSize displaySize = Workspace::self()->geometry().size();
     return QPoint(coords.x() * displaySize.width(), coords.y() * displaySize.height());
 }
 
 VirtualDesktop *EffectsHandler::desktopAbove(VirtualDesktop *desktop, bool wrap) const
 {
     return VirtualDesktopManager::self()->inDirection(desktop, VirtualDesktopManager::Direction::Up, wrap);
 }
 
 VirtualDesktop *EffectsHandler::desktopToRight(VirtualDesktop *desktop, bool wrap) const
 {
     return VirtualDesktopManager::self()->inDirection(desktop, VirtualDesktopManager::Direction::Right, wrap);
 }
 
 VirtualDesktop *EffectsHandler::desktopBelow(VirtualDesktop *desktop, bool wrap) const
 {
     return VirtualDesktopManager::self()->inDirection(desktop, VirtualDesktopManager::Direction::Down, wrap);
 }
 
 VirtualDesktop *EffectsHandler::desktopToLeft(VirtualDesktop *desktop, bool wrap) const
 {
     return VirtualDesktopManager::self()->inDirection(desktop, VirtualDesktopManager::Direction::Left, wrap);
 }
 
 QString EffectsHandler::desktopName(VirtualDesktop *desktop) const
 {
     return desktop->name();
 }
 
 bool EffectsHandler::optionRollOverDesktops() const
 {
     return options->isRollOverDesktops();
 }
 
 double EffectsHandler::animationTimeFactor() const
 {
     return options->animationTimeFactor();
 }
 
 EffectWindow *EffectsHandler::findWindow(WId id) const
 {
     if (X11Window *w = Workspace::self()->findClient(Predicate::WindowMatch, id)) {
         return w->effectWindow();
     }
     if (X11Window *w = Workspace::self()->findUnmanaged(id)) {
         return w->effectWindow();
     }
     return nullptr;
 }
 
 EffectWindow *EffectsHandler::findWindow(SurfaceInterface *surf) const
 {
     if (waylandServer()) {
         if (Window *w = waylandServer()->findWindow(surf)) {
             return w->effectWindow();
         }
     }
     return nullptr;
 }
 
 EffectWindow *EffectsHandler::findWindow(QWindow *w) const
 {
     if (Window *window = workspace()->findInternal(w)) {
         return window->effectWindow();
     }
     return nullptr;
 }
 
 EffectWindow *EffectsHandler::findWindow(const QUuid &id) const
 {
     if (Window *window = workspace()->findWindow(id)) {
         return window->effectWindow();
     }
     return nullptr;
 }
 
 QList<EffectWindow *> EffectsHandler::stackingOrder() const
 {
     QList<Window *> list = workspace()->stackingOrder();
     QList<EffectWindow *> ret;
     for (Window *t : list) {
         if (EffectWindow *w = t->effectWindow()) {
             ret.append(w);
         }
     }
     return ret;
 }
 
 void EffectsHandler::setElevatedWindow(KWin::EffectWindow *w, bool set)
 {
     WindowItem *item = w->windowItem();
 
     if (set) {
         item->elevate();
     } else {
         item->deelevate();
     }
 }
 
 void EffectsHandler::setTabBoxWindow(EffectWindow *w)
 {
 #if KWIN_BUILD_TABBOX
     auto window = w->window();
     if (window->isClient()) {
         workspace()->tabbox()->setCurrentClient(window);
     }
 #endif
 }
 
 QList<EffectWindow *> EffectsHandler::currentTabBoxWindowList() const
 {
 #if KWIN_BUILD_TABBOX
     const auto clients = workspace()->tabbox()->currentClientList();
     QList<EffectWindow *> ret;
     ret.reserve(clients.size());
     std::transform(std::cbegin(clients), std::cend(clients),
                    std::back_inserter(ret),
                    [](auto client) {
                        return client->effectWindow();
                    });
     return ret;
 #else
     return QList<EffectWindow *>();
 #endif
 }
 
 void EffectsHandler::refTabBox()
 {
 #if KWIN_BUILD_TABBOX
     workspace()->tabbox()->reference();
 #endif
 }
 
 void EffectsHandler::unrefTabBox()
 {
 #if KWIN_BUILD_TABBOX
     workspace()->tabbox()->unreference();
 #endif
 }
 
 void EffectsHandler::closeTabBox()
 {
 #if KWIN_BUILD_TABBOX
     workspace()->tabbox()->close();
 #endif
 }
 
 EffectWindow *EffectsHandler::currentTabBoxWindow() const
 {
 #if KWIN_BUILD_TABBOX
     if (auto c = workspace()->tabbox()->currentClient()) {
         return c->effectWindow();
     }
 #endif
     return nullptr;
 }
 
 void EffectsHandler::addRepaintFull()
 {
     m_compositor->scene()->addRepaintFull();
 }
 
 void EffectsHandler::addRepaint(const QRect &r)
 {
     m_compositor->scene()->addRepaint(r);
 }
 
 void EffectsHandler::addRepaint(const QRectF &r)
 {
     m_compositor->scene()->addRepaint(r.toAlignedRect());
 }
 
 void EffectsHandler::addRepaint(const QRegion &r)
 {
     m_compositor->scene()->addRepaint(r);
 }
 
 void EffectsHandler::addRepaint(int x, int y, int w, int h)
 {
     m_compositor->scene()->addRepaint(x, y, w, h);
 }
 
 Output *EffectsHandler::activeScreen() const
 {
     return workspace()->activeOutput();
 }
 
 QRectF EffectsHandler::clientArea(clientAreaOption opt, const Output *screen, const VirtualDesktop *desktop) const
 {
     return Workspace::self()->clientArea(opt, screen, desktop);
 }
 
 QRectF EffectsHandler::clientArea(clientAreaOption opt, const EffectWindow *effectWindow) const
 {
     const Window *window = effectWindow->window();
     return Workspace::self()->clientArea(opt, window);
 }
 
 QRectF EffectsHandler::clientArea(clientAreaOption opt, const QPoint &p, const VirtualDesktop *desktop) const
 {
     const Output *output = Workspace::self()->outputAt(p);
     return Workspace::self()->clientArea(opt, output, desktop);
 }
 
 QRect EffectsHandler::virtualScreenGeometry() const
 {
     return Workspace::self()->geometry();
 }
 
 QSize EffectsHandler::virtualScreenSize() const
 {
     return Workspace::self()->geometry().size();
 }
 
 void EffectsHandler::defineCursor(Qt::CursorShape shape)
 {
     input()->pointer()->setEffectsOverrideCursor(shape);
 }
 
 bool EffectsHandler::checkInputWindowEvent(QMouseEvent *e)
 {
     if (m_grabbedMouseEffects.isEmpty()) {
         return false;
     }
     for (Effect *effect : std::as_const(m_grabbedMouseEffects)) {
         effect->windowInputMouseEvent(e);
     }
     return true;
 }
 
 bool EffectsHandler::checkInputWindowEvent(QWheelEvent *e)
 {
     if (m_grabbedMouseEffects.isEmpty()) {
         return false;
     }
     for (Effect *effect : std::as_const(m_grabbedMouseEffects)) {
         effect->windowInputMouseEvent(e);
     }
     return true;
 }
 
 void EffectsHandler::connectNotify(const QMetaMethod &signal)
 {
     if (signal == QMetaMethod::fromSignal(&EffectsHandler::cursorShapeChanged)) {
         if (!m_trackingCursorChanges) {
             connect(Cursors::self()->mouse(), &Cursor::cursorChanged, this, &EffectsHandler::cursorShapeChanged);
             Cursors::self()->mouse()->startCursorTracking();
         }
         ++m_trackingCursorChanges;
     }
     QObject::connectNotify(signal);
 }
 
 void EffectsHandler::disconnectNotify(const QMetaMethod &signal)
 {
     if (signal == QMetaMethod::fromSignal(&EffectsHandler::cursorShapeChanged)) {
         Q_ASSERT(m_trackingCursorChanges > 0);
         if (!--m_trackingCursorChanges) {
             Cursors::self()->mouse()->stopCursorTracking();
             disconnect(Cursors::self()->mouse(), &Cursor::cursorChanged, this, &EffectsHandler::cursorShapeChanged);
         }
     }
     QObject::disconnectNotify(signal);
 }
 
 void EffectsHandler::checkInputWindowStacking()
 {
     if (m_grabbedMouseEffects.isEmpty()) {
         return;
     }
     doCheckInputWindowStacking();
 }
 
 void EffectsHandler::doCheckInputWindowStacking()
 {
 }
 
 QPointF EffectsHandler::cursorPos() const
 {
     return Cursors::self()->mouse()->pos();
 }
 
 void EffectsHandler::reserveElectricBorder(ElectricBorder border, Effect *effect)
 {
     workspace()->screenEdges()->reserve(border, effect, "borderActivated");
 }
 
 void EffectsHandler::unreserveElectricBorder(ElectricBorder border, Effect *effect)
 {
     workspace()->screenEdges()->unreserve(border, effect);
 }
 
 void EffectsHandler::registerTouchBorder(ElectricBorder border, QAction *action)
 {
     workspace()->screenEdges()->reserveTouch(border, action);
 }
 
 void EffectsHandler::registerRealtimeTouchBorder(ElectricBorder border, QAction *action, EffectsHandler::TouchBorderCallback progressCallback)
 {
     workspace()->screenEdges()->reserveTouch(border, action, progressCallback);
 }
 
 void EffectsHandler::unregisterTouchBorder(ElectricBorder border, QAction *action)
 {
     workspace()->screenEdges()->unreserveTouch(border, action);
 }
 
 QPainter *EffectsHandler::scenePainter()
 {
     return m_scene->renderer()->painter();
 }
 
 void EffectsHandler::toggleEffect(const QString &name)
 {
     if (isEffectLoaded(name)) {
         unloadEffect(name);
     } else {
         loadEffect(name);
     }
 }
 
 QStringList EffectsHandler::loadedEffects() const
 {
     QStringList listModules;
     listModules.reserve(loaded_effects.count());
     std::transform(loaded_effects.constBegin(), loaded_effects.constEnd(),
                    std::back_inserter(listModules),
                    [](const EffectPair &pair) {
                        return pair.first;
                    });
     return listModules;
 }
 
 QStringList EffectsHandler::listOfEffects() const
 {
     return m_effectLoader->listOfKnownEffects();
 }
 
 bool EffectsHandler::loadEffect(const QString &name)
 {
     makeOpenGLContextCurrent();
     m_compositor->scene()->addRepaintFull();
 
     return m_effectLoader->loadEffect(name);
 }
 
 void EffectsHandler::unloadEffect(const QString &name)
 {
     auto it = std::find_if(effect_order.begin(), effect_order.end(),
                            [name](EffectPair &pair) {
                                return pair.first == name;
                            });
     if (it == effect_order.end()) {
         qCDebug(KWIN_CORE) << "EffectsHandler::unloadEffect : Effect not loaded :" << name;
         return;
     }
 
     qCDebug(KWIN_CORE) << "EffectsHandler::unloadEffect : Unloading Effect :" << name;
     destroyEffect((*it).second);
     effect_order.erase(it);
     effectsChanged();
 
     m_compositor->scene()->addRepaintFull();
 }
 
 void EffectsHandler::destroyEffect(Effect *effect)
 {
     makeOpenGLContextCurrent();
 
     if (fullscreen_effect == effect) {
         setActiveFullScreenEffect(nullptr);
     }
 
     if (keyboard_grab_effect == effect) {
         ungrabKeyboard();
     }
 
     stopMouseInterception(effect);
 
     const QList<QByteArray> properties = m_propertiesForEffects.keys();
     for (const QByteArray &property : properties) {
         removeSupportProperty(property, effect);
     }
 
     delete effect;
 }
 
 void EffectsHandler::reconfigureEffects()
 {
     makeOpenGLContextCurrent();
     for (const EffectPair &pair : loaded_effects) {
         pair.second->reconfigure(Effect::ReconfigureAll);
     }
 }
 
 void EffectsHandler::reconfigureEffect(const QString &name)
 {
     for (QList<EffectPair>::const_iterator it = loaded_effects.constBegin(); it != loaded_effects.constEnd(); ++it) {
         if ((*it).first == name) {
             kwinApp()->config()->reparseConfiguration();
             makeOpenGLContextCurrent();
             (*it).second->reconfigure(Effect::ReconfigureAll);
             return;
         }
     }
 }
 
 bool EffectsHandler::isEffectLoaded(const QString &name) const
 {
     auto it = std::find_if(loaded_effects.constBegin(), loaded_effects.constEnd(),
                            [&name](const EffectPair &pair) {
                                return pair.first == name;
                            });
     return it != loaded_effects.constEnd();
 }
 
 bool EffectsHandler::isEffectSupported(const QString &name)
 {
     // If the effect is loaded, it is obviously supported.
     if (isEffectLoaded(name)) {
         return true;
     }
 
     // next checks might require a context
     makeOpenGLContextCurrent();
 
     return m_effectLoader->isEffectSupported(name);
 }
 
 QList<bool> EffectsHandler::areEffectsSupported(const QStringList &names)
 {
     QList<bool> retList;
     retList.reserve(names.count());
     std::transform(names.constBegin(), names.constEnd(),
                    std::back_inserter(retList),
                    [this](const QString &name) {
                        return isEffectSupported(name);
                    });
     return retList;
 }
 
 void EffectsHandler::reloadEffect(Effect *effect)
 {
     QString effectName;
     for (QList<EffectPair>::const_iterator it = loaded_effects.constBegin(); it != loaded_effects.constEnd(); ++it) {
         if ((*it).second == effect) {
             effectName = (*it).first;
             break;
         }
     }
     if (!effectName.isNull()) {
         unloadEffect(effectName);
         m_effectLoader->loadEffect(effectName);
     }
 }
 
 void EffectsHandler::effectsChanged()
 {
     loaded_effects.clear();
     m_activeEffects.clear(); // it's possible to have a reconfigure and a quad rebuild between two paint cycles - bug #308201
 
     loaded_effects.reserve(effect_order.count());
     std::copy(effect_order.constBegin(), effect_order.constEnd(),
               std::back_inserter(loaded_effects));
 
     m_activeEffects.reserve(loaded_effects.count());
 
     m_currentPaintScreenIterator = m_activeEffects.constBegin();
     m_currentPaintWindowIterator = m_activeEffects.constBegin();
     m_currentDrawWindowIterator = m_activeEffects.constBegin();
 }
 
 QStringList EffectsHandler::activeEffects() const
 {
     QStringList ret;
     for (QList<KWin::EffectPair>::const_iterator it = loaded_effects.constBegin(),
                                                  end = loaded_effects.constEnd();
          it != end; ++it) {
         if (it->second->isActive()) {
             ret << it->first;
         }
     }
     return ret;
 }
 
 bool EffectsHandler::isEffectActive(const QString &pluginId) const
 {
     auto it = std::find_if(loaded_effects.cbegin(), loaded_effects.cend(), [&pluginId](const EffectPair &p) {
         return p.first == pluginId;
     });
     if (it == loaded_effects.cend()) {
         return false;
     }
     return it->second->isActive();
 }
 
 bool EffectsHandler::blocksDirectScanout() const
 {
     return std::any_of(m_activeEffects.constBegin(), m_activeEffects.constEnd(), [](const Effect *effect) {
         return effect->blocksDirectScanout();
     });
 }
 
 Display *EffectsHandler::waylandDisplay() const
 {
     if (waylandServer()) {
         return waylandServer()->display();
     }
     return nullptr;
 }
 
 QVariant EffectsHandler::kwinOption(KWinOption kwopt)
 {
     switch (kwopt) {
     case CloseButtonCorner: {
         // TODO: this could become per window and be derived from the actual position in the deco
         const auto settings = Workspace::self()->decorationBridge()->settings();
         return settings && settings->decorationButtonsLeft().contains(KDecoration2::DecorationButtonType::Close) ? Qt::TopLeftCorner : Qt::TopRightCorner;
     }
     case SwitchDesktopOnScreenEdge:
         return workspace()->screenEdges()->isDesktopSwitching();
     case SwitchDesktopOnScreenEdgeMovingWindows:
         return workspace()->screenEdges()->isDesktopSwitchingMovingClients();
     default:
         return QVariant(); // an invalid one
     }
 }
 
 QString EffectsHandler::supportInformation(const QString &name) const
 {
     auto it = std::find_if(loaded_effects.constBegin(), loaded_effects.constEnd(),
                            [name](const EffectPair &pair) {
                                return pair.first == name;
                            });
     if (it == loaded_effects.constEnd()) {
         return QString();
     }
 
     QString support((*it).first + QLatin1String(":\n"));
     const QMetaObject *metaOptions = (*it).second->metaObject();
     for (int i = 0; i < metaOptions->propertyCount(); ++i) {
         const QMetaProperty property = metaOptions->property(i);
         if (qstrcmp(property.name(), "objectName") == 0) {
             continue;
         }
         support += QString::fromUtf8(property.name()) + QLatin1String(": ") + (*it).second->property(property.name()).toString() + QLatin1Char('\n');
     }
 
     return support;
 }
 
 bool EffectsHandler::isScreenLocked() const
 {
 #if KWIN_BUILD_SCREENLOCKER
     return kwinApp()->screenLockerWatcher()->isLocked();
 #else
     return false;
 #endif
 }
 
 QString EffectsHandler::debug(const QString &name, const QString &parameter) const
 {
     QString internalName = name.toLower();
     for (QList<EffectPair>::const_iterator it = loaded_effects.constBegin(); it != loaded_effects.constEnd(); ++it) {
         if ((*it).first == internalName) {
             return it->second->debug(parameter);
         }
     }
     return QString();
 }
 
 bool EffectsHandler::makeOpenGLContextCurrent()
 {
     return m_scene->makeOpenGLContextCurrent();
 }
 
 void EffectsHandler::doneOpenGLContextCurrent()
 {
     m_scene->doneOpenGLContextCurrent();
 }
 
 bool EffectsHandler::animationsSupported() const
 {
     static const QByteArray forceEnvVar = qgetenv("KWIN_EFFECTS_FORCE_ANIMATIONS");
     if (!forceEnvVar.isEmpty()) {
         static const int forceValue = forceEnvVar.toInt();
         return forceValue == 1;
     }
     return m_scene->animationsSupported();
 }
 
 void EffectsHandler::highlightWindows(const QList<EffectWindow *> &windows)
 {
     Effect *e = provides(Effect::HighlightWindows);
     if (!e) {
         return;
     }
     e->perform(Effect::HighlightWindows, QVariantList{QVariant::fromValue(windows)});
 }
 
 PlatformCursorImage EffectsHandler::cursorImage() const
 {
     return kwinApp()->cursorImage();
 }
 
 void EffectsHandler::hideCursor()
 {
     Cursors::self()->hideCursor();
 }
 
 void EffectsHandler::showCursor()
 {
     Cursors::self()->showCursor();
 }
 
 void EffectsHandler::startInteractiveWindowSelection(std::function<void(KWin::EffectWindow *)> callback)
 {
     kwinApp()->startInteractiveWindowSelection([callback](KWin::Window *window) {
         if (window && window->effectWindow()) {
             callback(window->effectWindow());
         } else {
             callback(nullptr);
         }
     });
 }
 
 void EffectsHandler::startInteractivePositionSelection(std::function<void(const QPointF &)> callback)
 {
     kwinApp()->startInteractivePositionSelection(callback);
 }
 
 void EffectsHandler::showOnScreenMessage(const QString &message, const QString &iconName)
 {
     OSD::show(message, iconName);
 }
 
 void EffectsHandler::hideOnScreenMessage(OnScreenMessageHideFlags flags)
 {
     OSD::HideFlags osdFlags;
     if (flags.testFlag(OnScreenMessageHideFlag::SkipsCloseAnimation)) {
         osdFlags |= OSD::HideFlag::SkipCloseAnimation;
     }
     OSD::hide(osdFlags);
 }
 
 KSharedConfigPtr EffectsHandler::config() const
 {
     return kwinApp()->config();
 }
 
 KSharedConfigPtr EffectsHandler::inputConfig() const
 {
     return kwinApp()->inputConfig();
 }
 
 Effect *EffectsHandler::findEffect(const QString &name) const
 {
     auto it = std::find_if(loaded_effects.constBegin(), loaded_effects.constEnd(), [name](const EffectPair &pair) {
         return pair.first == name;
     });
     if (it == loaded_effects.constEnd()) {
         return nullptr;
     }
     return (*it).second;
 }
 
 void EffectsHandler::renderOffscreenQuickView(const RenderTarget &renderTarget, const RenderViewport &viewport, OffscreenQuickView *w) const
 {
     if (!w->isVisible()) {
         return;
     }
     if (compositingType() == OpenGLCompositing) {
         GLTexture *t = w->bufferAsTexture();
         if (!t) {
             return;
         }
 
         ShaderTraits traits = ShaderTrait::MapTexture | ShaderTrait::TransformColorspace;
         const qreal a = w->opacity();
         if (a != 1.0) {
             traits |= ShaderTrait::Modulate;
         }
 
         GLShader *shader = ShaderManager::instance()->pushShader(traits);
         const QRectF rect = scaledRect(w->geometry(), viewport.scale());
 
         QMatrix4x4 mvp(viewport.projectionMatrix());
         mvp.translate(rect.x(), rect.y());
         shader->setUniform(GLShader::Mat4Uniform::ModelViewProjectionMatrix, mvp);
 
         if (a != 1.0) {
             shader->setUniform(GLShader::Vec4Uniform::ModulationConstant, QVector4D(a, a, a, a));
         }
         shader->setColorspaceUniformsFromSRGB(renderTarget.colorDescription());
 
         const bool alphaBlending = w->hasAlphaChannel() || (a != 1.0);
         if (alphaBlending) {
             glEnable(GL_BLEND);
             glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
         }
 
         t->render(rect.size());
 
         if (alphaBlending) {
             glDisable(GL_BLEND);
         }
 
         ShaderManager::instance()->popShader();
     } else if (compositingType() == QPainterCompositing) {
         QPainter *painter = effects->scenePainter();
         const QImage buffer = w->bufferAsImage();
         if (buffer.isNull()) {
             return;
         }
         painter->save();
         painter->setOpacity(w->opacity());
         painter->drawImage(w->geometry(), buffer);
         painter->restore();
     }
 }
 
 SessionState EffectsHandler::sessionState() const
 {
     return Workspace::self()->sessionManager()->state();
 }
 
 QList<Output *> EffectsHandler::screens() const
 {
     return Workspace::self()->outputs();
 }
 
 Output *EffectsHandler::screenAt(const QPoint &point) const
 {
     return Workspace::self()->outputAt(point);
 }
 
 Output *EffectsHandler::findScreen(const QString &name) const
 {
     const auto outputs = Workspace::self()->outputs();
     for (Output *screen : outputs) {
         if (screen->name() == name) {
             return screen;
         }
     }
     return nullptr;
 }
 
 Output *EffectsHandler::findScreen(int screenId) const
 {
     return Workspace::self()->outputs().value(screenId);
 }
 
 bool EffectsHandler::isCursorHidden() const
 {
     return Cursors::self()->isCursorHidden();
 }
 
 KWin::EffectWindow *EffectsHandler::inputPanel() const
 {
     if (!kwinApp()->inputMethod() || !kwinApp()->inputMethod()->isEnabled()) {
         return nullptr;
     }
 
     auto panel = kwinApp()->inputMethod()->panel();
     if (panel) {
         return panel->effectWindow();
     }
     return nullptr;
 }
 
 bool EffectsHandler::isInputPanelOverlay() const
 {
     if (!kwinApp()->inputMethod() || !kwinApp()->inputMethod()->isEnabled()) {
         return true;
     }
 
     auto panel = kwinApp()->inputMethod()->panel();
     if (panel) {
         return panel->mode() == InputPanelV1Window::Mode::Overlay;
     }
     return true;
 }
 
 QQmlEngine *EffectsHandler::qmlEngine() const
 {
     return Scripting::self()->qmlEngine();
 }
 
 EffectsHandler *effects = nullptr;
 
 } // namespace
 
 #include "moc_effecthandler.cpp"
 #include "moc_globals.cpp"