fix: resolve merge conflict due to addition of color quantizer

Fixes issues caused by the QML engine caching old pixmaps using the
same IDs as new ones, notably dbusmenu icons.

src/core/CMakeLists.txt

@@ -37,6 +37,7 @@ qt_add_library(quickshell-core STATIC
 	common.cpp
 	iconprovider.cpp
 	scriptmodel.cpp
+	colorquantizer.cpp
 )
 
 qt_add_qml_module(quickshell-core

src/core/clock.cpp

@@ -6,8 +6,6 @@
 #include <qtmetamacros.h>
 #include <qtypes.h>
 
-#include "util.hpp"
-
 SystemClock::SystemClock(QObject* parent): QObject(parent) {
 	QObject::connect(&this->timer, &QTimer::timeout, this, &SystemClock::onTimeout);
 	this->update();
@@ -48,19 +46,16 @@ void SystemClock::update() {
 void SystemClock::setTime(const QDateTime& targetTime) {
 	auto currentTime = QDateTime::currentDateTime();
 	auto offset = currentTime.msecsTo(targetTime);
-	auto dtime = offset > -500 && offset < 500 ? targetTime : currentTime;
+	this->currentTime = offset > -500 && offset < 500 ? targetTime : currentTime;
-	auto time = dtime.time();
 
-	auto secondPrecision = this->mPrecision >= SystemClock::Seconds;
+	auto time = this->currentTime.time();
-	auto secondChanged = this->setSeconds(secondPrecision ? time.second() : 0);
+	this->currentTime.setTime(QTime(
+	    this->mPrecision >= SystemClock::Hours ? time.hour() : 0,
+	    this->mPrecision >= SystemClock::Minutes ? time.minute() : 0,
+	    this->mPrecision >= SystemClock::Seconds ? time.second() : 0
+	));
 
-	auto minutePrecision = this->mPrecision >= SystemClock::Minutes;
+	emit this->dateChanged();
-	auto minuteChanged = this->setMinutes(minutePrecision ? time.minute() : 0);
-
-	auto hourPrecision = this->mPrecision >= SystemClock::Hours;
-	auto hourChanged = this->setHours(hourPrecision ? time.hour() : 0);
-
-	DropEmitter::call(secondChanged, minuteChanged, hourChanged);
 }
 
 void SystemClock::schedule(const QDateTime& targetTime) {
@@ -76,11 +71,11 @@ void SystemClock::schedule(const QDateTime& targetTime) {
 	auto nextTime = offset > 0 && offset < 500 ? targetTime : currentTime;
 
 	auto baseTimeT = nextTime.time();
-	nextTime.setTime(
+	nextTime.setTime(QTime(
-	    {hourPrecision ? baseTimeT.hour() : 0,
+	    hourPrecision ? baseTimeT.hour() : 0,
 	    minutePrecision ? baseTimeT.minute() : 0,
-	     secondPrecision ? baseTimeT.second() : 0}
+	    secondPrecision ? baseTimeT.second() : 0
-	);
+	));
 
 	if (secondPrecision) nextTime = nextTime.addSecs(1);
 	else if (minutePrecision) nextTime = nextTime.addSecs(60);
@@ -91,7 +86,3 @@ void SystemClock::schedule(const QDateTime& targetTime) {
 	this->timer.start(static_cast<qint32>(delay));
 	this->targetTime = nextTime;
 }
-
-DEFINE_MEMBER_GETSET(SystemClock, hours, setHours);
-DEFINE_MEMBER_GETSET(SystemClock, minutes, setMinutes);
-DEFINE_MEMBER_GETSET(SystemClock, seconds, setSeconds);

src/core/clock.hpp

@@ -7,9 +7,26 @@
 #include <qtmetamacros.h>
 #include <qtypes.h>
 
-#include "util.hpp"
-
 ///! System clock accessor.
+/// SystemClock is a view into the system's clock.
+/// It updates at hour, minute, or second intervals depending on @@precision.
+///
+/// # Examples
+/// ```qml
+/// SystemClock {
+///   id: clock
+///   precision: SystemClock.Seconds
+/// }
+///
+/// @@QtQuick.Text {
+///   text: Qt.formatDateTime(clock.date, "hh:mm:ss - yyyy-MM-dd")
+/// }
+/// ```
+///
+/// > [!WARNING] Clock updates will trigger within 50ms of the system clock changing,
+/// > however this can be either before or after the clock changes (+-50ms). If you
+/// > need a date object, use @@date instead of constructing a new one, or the time
+/// > of the constructed object could be off by up to a second.
 class SystemClock: public QObject {
 	Q_OBJECT;
 	/// If the clock should update. Defaults to true.
@@ -18,12 +35,17 @@ class SystemClock: public QObject {
 	Q_PROPERTY(bool enabled READ enabled WRITE setEnabled NOTIFY enabledChanged);
 	/// The precision the clock should measure at. Defaults to `SystemClock.Seconds`.
 	Q_PROPERTY(SystemClock::Enum precision READ precision WRITE setPrecision NOTIFY precisionChanged);
+	/// The current date and time.
+	///
+	/// > [!TIP] You can use @@QtQml.Qt.formatDateTime() to get the time as a string in
+	/// > your format of choice.
+	Q_PROPERTY(QDateTime date READ date NOTIFY dateChanged);
 	/// The current hour.
-	Q_PROPERTY(quint32 hours READ hours NOTIFY hoursChanged);
+	Q_PROPERTY(quint32 hours READ hours NOTIFY dateChanged);
 	/// The current minute, or 0 if @@precision is `SystemClock.Hours`.
-	Q_PROPERTY(quint32 minutes READ minutes NOTIFY minutesChanged);
+	Q_PROPERTY(quint32 minutes READ minutes NOTIFY dateChanged);
 	/// The current second, or 0 if @@precision is `SystemClock.Hours` or `SystemClock.Minutes`.
-	Q_PROPERTY(quint32 seconds READ seconds NOTIFY secondsChanged);
+	Q_PROPERTY(quint32 seconds READ seconds NOTIFY dateChanged);
 	QML_ELEMENT;
 
 public:
@@ -43,12 +65,15 @@ public:
 	[[nodiscard]] SystemClock::Enum precision() const;
 	void setPrecision(SystemClock::Enum precision);
 
+	[[nodiscard]] QDateTime date() const { return this->currentTime; }
+	[[nodiscard]] quint32 hours() const { return this->currentTime.time().hour(); }
+	[[nodiscard]] quint32 minutes() const { return this->currentTime.time().minute(); }
+	[[nodiscard]] quint32 seconds() const { return this->currentTime.time().second(); }
+
 signals:
 	void enabledChanged();
 	void precisionChanged();
-	void hoursChanged();
+	void dateChanged();
-	void minutesChanged();
-	void secondsChanged();
 
 private slots:
 	void onTimeout();
@@ -56,17 +81,11 @@ private slots:
 private:
 	bool mEnabled = true;
 	SystemClock::Enum mPrecision = SystemClock::Seconds;
-	quint32 mHours = 0;
-	quint32 mMinutes = 0;
-	quint32 mSeconds = 0;
 	QTimer timer;
+	QDateTime currentTime;
 	QDateTime targetTime;
 
 	void update();
 	void setTime(const QDateTime& targetTime);
 	void schedule(const QDateTime& targetTime);
-
-	DECLARE_PRIVATE_MEMBER(SystemClock, hours, setHours, mHours, hoursChanged);
-	DECLARE_PRIVATE_MEMBER(SystemClock, minutes, setMinutes, mMinutes, minutesChanged);
-	DECLARE_PRIVATE_MEMBER(SystemClock, seconds, setSeconds, mSeconds, secondsChanged);
 };

src/core/colorquantizer.cpp

@@ -0,0 +1,182 @@
+#include "colorquantizer.hpp"
+
+#include <qcolor.h>
+#include <qobject.h>
+#include <qqmllist.h>
+#include <qthreadpool.h>
+#include <qtypes.h>
+
+ColorQuantizerOperation::ColorQuantizerOperation(QUrl* source, qreal depth, qreal rescaleSize)
+    : source(source)
+    , maxDepth(depth)
+    , rescaleSize(rescaleSize) {
+	mColors = QList<QColor>();
+}
+
+void ColorQuantizerOperation::run() {
+	quantizeImage();
+
+	emit done(mColors);
+}
+
+void ColorQuantizerOperation::quantizeImage() {
+	mColors.clear();
+
+	if (source->isEmpty()) {
+		return;
+	}
+
+	QImage image(source->toLocalFile());
+
+	if ((image.width() > rescaleSize || image.height() > rescaleSize) && rescaleSize > 0) {
+		image = image.scaled(
+		    static_cast<int>(rescaleSize),
+		    static_cast<int>(rescaleSize),
+		    Qt::KeepAspectRatio,
+		    Qt::SmoothTransformation
+		);
+	}
+
+	if (image.isNull()) {
+		qWarning() << "Failed to load image from" << source;
+		return;
+	}
+
+	QList<QColor> pixels;
+	for (int y = 0; y < image.height(); ++y) {
+		for (int x = 0; x < image.width(); ++x) {
+			QRgb pixel = image.pixel(x, y);
+			if (qAlpha(pixel) == 0) {
+				continue;
+			}
+
+			pixels.append(QColor::fromRgb(pixel));
+		}
+	}
+
+	QDateTime startTime = QDateTime::currentDateTime();
+
+	mColors = quantization(pixels, 0);
+
+	QDateTime endTime = QDateTime::currentDateTime();
+	qint64 milliseconds = startTime.msecsTo(endTime);
+	qDebug() << "Color Quantization took: " << milliseconds << "ms";
+}
+
+QList<QColor> ColorQuantizerOperation::quantization(QList<QColor>& rgbValues, qreal depth) {
+	if (depth >= maxDepth || rgbValues.isEmpty()) {
+		if (rgbValues.isEmpty()) {
+			return QList<QColor>();
+		}
+
+		int totalR = 0;
+		int totalG = 0;
+		int totalB = 0;
+
+		for (const QColor& color: rgbValues) {
+			totalR += color.red();
+			totalG += color.green();
+			totalB += color.blue();
+		}
+
+		QColor avgColor(
+		    qRound(totalR / static_cast<double>(rgbValues.size())),
+		    qRound(totalG / static_cast<double>(rgbValues.size())),
+		    qRound(totalB / static_cast<double>(rgbValues.size()))
+		);
+
+		return QList<QColor>() << avgColor;
+	}
+
+	QString dominantChannel = findBiggestColorRange(rgbValues);
+	std::ranges::sort(rgbValues, [dominantChannel](const QColor& a, const QColor& b) {
+		if (dominantChannel == "r") return a.red() < b.red();
+		else if (dominantChannel == "g") return a.green() < b.green();
+		return a.blue() < b.blue();
+	});
+
+	qsizetype mid = rgbValues.size() / 2;
+
+	QList<QColor> leftHalf = rgbValues.mid(0, mid);
+	QList<QColor> rightHalf = rgbValues.mid(mid + 1);
+
+	QList<QColor> result;
+	result.append(quantization(leftHalf, depth + 1));
+	result.append(quantization(rightHalf, depth + 1));
+
+	return result;
+}
+
+QString ColorQuantizerOperation::findBiggestColorRange(const QList<QColor>& rgbValues) {
+	if (rgbValues.isEmpty()) return "r";
+
+	int rMin = 255;
+	int gMin = 255;
+	int bMin = 255;
+	int rMax = 0;
+	int gMax = 0;
+	int bMax = 0;
+
+	for (const QColor& color: rgbValues) {
+		rMin = qMin(rMin, color.red());
+		gMin = qMin(gMin, color.green());
+		bMin = qMin(bMin, color.blue());
+
+		rMax = qMax(rMax, color.red());
+		gMax = qMax(gMax, color.green());
+		bMax = qMax(bMax, color.blue());
+	}
+
+	int rRange = rMax - rMin;
+	int gRange = gMax - gMin;
+	int bRange = bMax - bMin;
+
+	int biggestRange = qMax(rRange, qMax(gRange, bRange));
+	if (biggestRange == rRange) {
+		return "r";
+	} else if (biggestRange == gRange) {
+		return "g";
+	} else {
+		return "b";
+	}
+}
+
+QList<QColor> ColorQuantizer::colors() { return mColors; }
+
+void ColorQuantizer::setSource(const QUrl& source) {
+	if (mSource != source) {
+		mSource = source;
+		emit sourceChanged();
+		quantizeAsync();
+	}
+}
+
+void ColorQuantizer::setDepth(qreal depth) {
+	if (mDepth != depth) {
+		mDepth = depth;
+		emit depthChanged();
+	}
+}
+
+void ColorQuantizer::setRescaleSize(int rescaleSize) {
+	if (mRescaleSize != rescaleSize) {
+		mRescaleSize = rescaleSize;
+		emit rescaleSizeChanged();
+	}
+}
+
+void ColorQuantizer::operationFinished(const QList<QColor>& result) {
+	mColors = result;
+	emit colorsChanged();
+	isProcessing = false;
+}
+
+void ColorQuantizer::quantizeAsync() {
+	if (isProcessing) return;
+
+	qDebug() << "Starting color quantization asynchronously";
+	isProcessing = true;
+	auto* task = new ColorQuantizerOperation(&mSource, mDepth, mRescaleSize);
+	QObject::connect(task, &ColorQuantizerOperation::done, this, &ColorQuantizer::operationFinished);
+	QThreadPool::globalInstance()->start(task);
+}

src/core/colorquantizer.hpp

@@ -0,0 +1,95 @@
+#pragma once
+
+#include <qlist.h>
+#include <qmutex.h>
+#include <qobject.h>
+#include <qqmlintegration.h>
+#include <qrunnable.h>
+#include <qtmetamacros.h>
+#include <qtypes.h>
+
+class ColorQuantizerOperation
+    : public QObject
+    , public QRunnable {
+	Q_OBJECT;
+
+public:
+	ColorQuantizerOperation(QUrl* source, qreal depth, qreal rescaleSize);
+
+	void run() override;
+
+signals:
+	void done(QList<QColor> colors);
+
+private:
+	QList<QColor> mColors;
+	QUrl* source;
+	qreal maxDepth;
+	qreal rescaleSize;
+
+	void quantizeImage();
+	QList<QColor> quantization(QList<QColor>& rgbValues, qreal depth);
+	static QString findBiggestColorRange(const QList<QColor>& rgbValues);
+};
+
+///! Color Quantization Utility
+/// A color quantization utility used for getting prevalent colors in an image, by
+/// averaging out the image's color data recursively.
+///
+/// #### Example
+/// ```qml
+/// ColorQuantizer {
+///   id: colorQuantizer
+///   source: Qt.resolvedUrl("./yourImage.png")
+///   depth: 3 // Will produce 8 colors (2³)
+///   rescaleSize: 64 // Rescale to 64x64 for faster processing
+/// }
+/// ```
+
+class ColorQuantizer: public QObject {
+	Q_OBJECT;
+	/// Access the colors resulting from the color quantization performed.
+	/// > [!NOTE] The amount of colors returned from the quantization is determined by
+	/// > the property depth, specifically 2ⁿ where n is the depth.
+	Q_PROPERTY(QList<QColor> colors READ colors NOTIFY colorsChanged);
+
+	/// Path to the image you'd like to run the color quantization on.
+	Q_PROPERTY(QUrl source READ source WRITE setSource NOTIFY sourceChanged);
+
+	/// Max depth for the color quantization. Each level of depth represents another
+	/// binary split of the color space
+	Q_PROPERTY(qreal depth READ depth WRITE setDepth NOTIFY depthChanged);
+
+	/// The size to rescale the image to, when rescaleSize is 0 then no scaling will be done.
+	/// > [!NOTE] Results from color quantization doesn't suffer much when rescaling, it's
+	/// > reccommended to rescale, otherwise the quantization process will take much longer.
+	Q_PROPERTY(qreal rescaleSize READ rescaleSize WRITE setRescaleSize NOTIFY rescaleSizeChanged);
+	QML_ELEMENT;
+
+public:
+	QList<QColor> colors();
+	[[nodiscard]] QUrl source() const { return mSource; }
+	void setSource(const QUrl& source);
+	[[nodiscard]] qreal depth() const { return mDepth; }
+	void setDepth(qreal depth);
+	[[nodiscard]] qreal rescaleSize() const { return mRescaleSize; }
+	void setRescaleSize(int rescaleSize);
+
+signals:
+	void colorsChanged();
+	void sourceChanged();
+	void depthChanged();
+	void rescaleSizeChanged();
+
+public slots:
+	void operationFinished(const QList<QColor>& result);
+
+private:
+	bool isProcessing = false;
+	QList<QColor> mColors;
+	QUrl mSource;
+	qreal mDepth = 0;
+	qreal mRescaleSize = 0;
+
+	void quantizeAsync();
+};

src/core/desktopentry.cpp

@@ -213,7 +213,7 @@ QVector<QString> DesktopEntry::parseExecString(const QString& execString) {
 
 				currentArgument += c;
 				escape = 0;
-			} else if (c == u'"') {
+			} else if (c == u'"' || c == u'\'') {
 				parsingString = false;
 			} else {
 				currentArgument += c;
@@ -229,7 +229,7 @@ QVector<QString> DesktopEntry::parseExecString(const QString& execString) {
 			percent = false;
 		} else if (c == '%') {
 			percent = true;
-		} else if (c == u'"') {
+		} else if (c == u'"' || c == u'\'') {
 			parsingString = true;
 		} else if (c == u' ') {
 			if (!currentArgument.isEmpty()) {

src/core/imageprovider.cpp

@@ -1,5 +1,6 @@
 #include "imageprovider.hpp"
 
+#include <qcontainerfwd.h>
 #include <qdebug.h>
 #include <qimage.h>
 #include <qlogging.h>
@@ -7,10 +8,14 @@
 #include <qobject.h>
 #include <qpixmap.h>
 #include <qqmlengine.h>
+#include <qtypes.h>
 
 namespace {
 
+namespace {
 QMap<QString, QsImageHandle*> liveImages; // NOLINT
+quint32 handleIndex = 0;                  // NOLINT
+} // namespace
 
 void parseReq(const QString& req, QString& target, QString& param) {
 	auto splitIdx = req.indexOf('/');
@@ -24,14 +29,9 @@ void parseReq(const QString& req, QString& target, QString& param) {
 
 } // namespace
 
-QsImageHandle::QsImageHandle(QQmlImageProviderBase::ImageType type, QObject* parent)
+QsImageHandle::QsImageHandle(QQmlImageProviderBase::ImageType type)
-    : QObject(parent)
+    : type(type)
-    , type(type) {
+    , id(QString::number(++handleIndex)) {
-	{
-		auto dbg = QDebug(&this->id);
-		dbg.nospace() << static_cast<void*>(this);
-	}
-
 	liveImages.insert(this->id, this);
 }
 
@@ -85,3 +85,9 @@ QsPixmapProvider::requestPixmap(const QString& id, QSize* size, const QSize& req
 		return QPixmap();
 	}
 }
+
+QString QsIndexedImageHandle::url() const {
+	return this->QsImageHandle::url() % '/' % QString::number(this->changeIndex);
+}
+
+void QsIndexedImageHandle::imageChanged() { ++this->changeIndex; }

src/core/imageprovider.hpp

@@ -20,15 +20,13 @@ public:
 	QPixmap requestPixmap(const QString& id, QSize* size, const QSize& requestedSize) override;
 };
 
-class QsImageHandle: public QObject {
+class QsImageHandle {
-	Q_OBJECT;
-
 public:
-	explicit QsImageHandle(QQmlImageProviderBase::ImageType type, QObject* parent = nullptr);
+	explicit QsImageHandle(QQmlImageProviderBase::ImageType type);
-	~QsImageHandle() override;
+	virtual ~QsImageHandle();
 	Q_DISABLE_COPY_MOVE(QsImageHandle);
 
-	[[nodiscard]] QString url() const;
+	[[nodiscard]] virtual QString url() const;
 
 	virtual QImage requestImage(const QString& id, QSize* size, const QSize& requestedSize);
 	virtual QPixmap requestPixmap(const QString& id, QSize* size, const QSize& requestedSize);
@@ -37,3 +35,14 @@ private:
 	QQmlImageProviderBase::ImageType type;
 	QString id;
 };
+
+class QsIndexedImageHandle: public QsImageHandle {
+public:
+	explicit QsIndexedImageHandle(QQmlImageProviderBase::ImageType type): QsImageHandle(type) {}
+
+	[[nodiscard]] QString url() const override;
+	void imageChanged();
+
+private:
+	quint32 changeIndex = 0;
+};

src/core/module.md

@@ -29,5 +29,6 @@ headers = [
 	"qsmenuanchor.hpp",
 	"clock.hpp",
 	"scriptmodel.hpp",
+	"colorquantizer.hpp",
 ]
 -----

src/core/qmlscreen.cpp

@@ -42,6 +42,24 @@ QString QuickshellScreenInfo::name() const {
 	return this->screen->name();
 }
 
+QString QuickshellScreenInfo::model() const {
+	if (this->screen == nullptr) {
+		this->warnDangling();
+		return "{ NULL SCREEN }";
+	}
+
+	return this->screen->model();
+}
+
+QString QuickshellScreenInfo::serialNumber() const {
+	if (this->screen == nullptr) {
+		this->warnDangling();
+		return "{ NULL SCREEN }";
+	}
+
+	return this->screen->serialNumber();
+}
+
 qint32 QuickshellScreenInfo::x() const {
 	if (this->screen == nullptr) {
 		this->warnDangling();

src/core/qmlscreen.hpp

@@ -29,6 +29,10 @@ class QuickshellScreenInfo: public QObject {
 	///
 	/// Usually something like `DP-1`, `HDMI-1`, `eDP-1`.
 	Q_PROPERTY(QString name READ name CONSTANT);
+	/// The model of the screen as seen by the operating system.
+	Q_PROPERTY(QString model READ model CONSTANT);
+	/// The serial number of the screen as seen by the operating system.
+	Q_PROPERTY(QString serialNumber READ serialNumber CONSTANT);
 	Q_PROPERTY(qint32 x READ x NOTIFY geometryChanged);
 	Q_PROPERTY(qint32 y READ y NOTIFY geometryChanged);
 	Q_PROPERTY(qint32 width READ width NOTIFY geometryChanged);
@@ -49,6 +53,8 @@ public:
 	bool operator==(QuickshellScreenInfo& other) const;
 
 	[[nodiscard]] QString name() const;
+	[[nodiscard]] QString model() const;
+	[[nodiscard]] QString serialNumber() const;
 	[[nodiscard]] qint32 x() const;
 	[[nodiscard]] qint32 y() const;
 	[[nodiscard]] qint32 width() const;

src/dbus/dbusmenu/dbusmenu.cpp

@@ -59,8 +59,8 @@ QString DBusMenuItem::icon() const {
 		    this->iconName,
 		    this->menu->iconThemePath.value().join(':')
 		);
-	} else if (this->image != nullptr) {
+	} else if (this->image.hasData()) {
-		return this->image->url();
+		return this->image.url();
 	} else return nullptr;
 }
 
@@ -113,7 +113,7 @@ void DBusMenuItem::updateProperties(const QVariantMap& properties, const QString
 	auto originalEnabled = this->mEnabled;
 	auto originalVisible = this->visible;
 	auto originalIconName = this->iconName;
-	auto* originalImage = this->image;
+	auto imageChanged = false;
 	auto originalIsSeparator = this->mSeparator;
 	auto originalButtonType = this->mButtonType;
 	auto originalToggleState = this->mCheckState;
@@ -173,12 +173,16 @@ void DBusMenuItem::updateProperties(const QVariantMap& properties, const QString
 	if (iconData.canConvert<QByteArray>()) {
 		auto data = iconData.value<QByteArray>();
 		if (data.isEmpty()) {
-			this->image = nullptr;
+			imageChanged = this->image.hasData();
-		} else if (this->image == nullptr || this->image->data != data) {
+			this->image.data.clear();
-			this->image = new DBusMenuPngImage(data, this);
+		} else if (!this->image.hasData() || this->image.data != data) {
+			imageChanged = true;
+			this->image.data = data;
+			this->image.imageChanged();
 		}
 	} else if (removed.isEmpty() || removed.contains("icon-data")) {
-		this->image = nullptr;
+		imageChanged = this->image.hasData();
+		image.data.clear();
 	}
 
 	auto type = properties.value("type");
@@ -239,17 +243,13 @@ void DBusMenuItem::updateProperties(const QVariantMap& properties, const QString
 	if (this->mSeparator != originalIsSeparator) emit this->isSeparatorChanged();
 	if (this->displayChildren != originalDisplayChildren) emit this->hasChildrenChanged();
 
-	if (this->iconName != originalIconName || this->image != originalImage) {
+	if (this->iconName != originalIconName || imageChanged) {
-		if (this->image != originalImage) {
-			delete originalImage;
-		}
-
 		emit this->iconChanged();
 	}
 
 	qCDebug(logDbusMenu).nospace() << "Updated properties of " << this << " { label=" << this->mText
 	                               << ", enabled=" << this->mEnabled << ", visible=" << this->visible
-	                               << ", iconName=" << this->iconName << ", iconData=" << this->image
+	                               << ", iconName=" << this->iconName << ", iconData=" << &this->image
 	                               << ", separator=" << this->mSeparator
 	                               << ", toggleType=" << this->mButtonType
 	                               << ", toggleState=" << this->mCheckState

src/dbus/dbusmenu/dbusmenu.hpp

@@ -30,7 +30,17 @@ namespace qs::dbus::dbusmenu {
 using menu::QsMenuEntry;
 
 class DBusMenu;
-class DBusMenuPngImage;
+class DBusMenuItem;
+
+class DBusMenuPngImage: public QsIndexedImageHandle {
+public:
+	explicit DBusMenuPngImage(): QsIndexedImageHandle(QQuickImageProvider::Image) {}
+
+	[[nodiscard]] bool hasData() const { return !data.isEmpty(); }
+	QImage requestImage(const QString& id, QSize* size, const QSize& requestedSize) override;
+
+	QByteArray data;
+};
 
 ///! Menu item shared by an external program.
 /// Menu item shared by an external program via the
@@ -93,7 +103,7 @@ private:
 	bool visible = true;
 	bool mSeparator = false;
 	QString iconName;
-	DBusMenuPngImage* image = nullptr;
+	DBusMenuPngImage image;
 	menu::QsMenuButtonType::Enum mButtonType = menu::QsMenuButtonType::None;
 	Qt::CheckState mCheckState = Qt::Unchecked;
 	bool displayChildren = false;
@@ -156,17 +166,6 @@ private:
 
 QDebug operator<<(QDebug debug, DBusMenu* menu);
 
-class DBusMenuPngImage: public QsImageHandle {
-public:
-	explicit DBusMenuPngImage(QByteArray data, DBusMenuItem* parent)
-	    : QsImageHandle(QQuickImageProvider::Image, parent)
-	    , data(std::move(data)) {}
-
-	QImage requestImage(const QString& id, QSize* size, const QSize& requestedSize) override;
-
-	QByteArray data;
-};
-
 class DBusMenuHandle;
 
 QDebug operator<<(QDebug debug, const DBusMenuHandle* handle);

src/io/ipc.cpp

@@ -1,9 +1,12 @@
 #include "ipc.hpp"
+#include <cstring>
 #include <utility>
 
 #include <qcolor.h>
 #include <qmetatype.h>
 #include <qobjectdefs.h>
+#include <qtypes.h>
+#include <qvariant.h>
 
 namespace qs::io::ipc {
 
@@ -14,6 +17,12 @@ const BoolIpcType BoolIpcType::INSTANCE {};
 const DoubleIpcType DoubleIpcType::INSTANCE {};
 const ColorIpcType ColorIpcType::INSTANCE {};
 
+void* IpcType::copyStorage(const void* data) const {
+	auto* storage = this->createStorage();
+	memcpy(storage, data, this->size());
+	return storage;
+}
+
 const IpcType* IpcType::ipcType(const QMetaType& metaType) {
 	if (metaType.id() == QMetaType::Void) return &VoidIpcType::INSTANCE;
 	if (metaType.id() == QMetaType::QString) return &StringIpcType::INSTANCE;
@@ -70,12 +79,18 @@ void IpcTypeSlot::replace(void* value) {
 	this->storage = value;
 }
 
+void IpcTypeSlot::replace(const QVariant& value) {
+	this->replace(this->mType->copyStorage(value.constData()));
+}
+
 const char* VoidIpcType::name() const { return "void"; }
 const char* VoidIpcType::genericArgumentName() const { return "void"; }
+qsizetype VoidIpcType::size() const { return 0; }
 
 // string
 const char* StringIpcType::name() const { return "string"; }
 const char* StringIpcType::genericArgumentName() const { return "QString"; }
+qsizetype StringIpcType::size() const { return sizeof(QString); }
 void* StringIpcType::fromString(const QString& string) const { return new QString(string); }
 QString StringIpcType::toString(void* slot) const { return *static_cast<QString*>(slot); }
 void* StringIpcType::createStorage() const { return new QString(); }
@@ -84,6 +99,7 @@ void StringIpcType::destroyStorage(void* slot) const { delete static_cast<QStrin
 // int
 const char* IntIpcType::name() const { return "int"; }
 const char* IntIpcType::genericArgumentName() const { return "int"; }
+qsizetype IntIpcType::size() const { return sizeof(int); }
 
 void* IntIpcType::fromString(const QString& string) const {
 	auto ok = false;
@@ -100,6 +116,7 @@ void IntIpcType::destroyStorage(void* slot) const { delete static_cast<int*>(slo
 // bool
 const char* BoolIpcType::name() const { return "bool"; }
 const char* BoolIpcType::genericArgumentName() const { return "bool"; }
+qsizetype BoolIpcType::size() const { return sizeof(bool); }
 
 void* BoolIpcType::fromString(const QString& string) const {
 	if (string == "true") return new bool(true);
@@ -121,6 +138,7 @@ void BoolIpcType::destroyStorage(void* slot) const { delete static_cast<bool*>(s
 // double
 const char* DoubleIpcType::name() const { return "real"; }
 const char* DoubleIpcType::genericArgumentName() const { return "double"; }
+qsizetype DoubleIpcType::size() const { return sizeof(double); }
 
 void* DoubleIpcType::fromString(const QString& string) const {
 	auto ok = false;
@@ -139,6 +157,7 @@ void DoubleIpcType::destroyStorage(void* slot) const { delete static_cast<double
 // color
 const char* ColorIpcType::name() const { return "color"; }
 const char* ColorIpcType::genericArgumentName() const { return "QColor"; }
+qsizetype ColorIpcType::size() const { return sizeof(QColor); }
 
 void* ColorIpcType::fromString(const QString& string) const {
 	auto color = QColor::fromString(string);
@@ -167,6 +186,10 @@ QString WireFunctionDefinition::toString() const {
 	return "function " % this->name % '(' % paramString % "): " % this->returnType;
 }
 
+QString WirePropertyDefinition::toString() const {
+	return "property " % this->name % ": " % this->type;
+}
+
 QString WireTargetDefinition::toString() const {
 	QString accum = "target " % this->name;
 
@@ -174,6 +197,10 @@ QString WireTargetDefinition::toString() const {
 		accum += "\n  " % func.toString();
 	}
 
+	for (const auto& prop: this->properties) {
+		accum += "\n  " % prop.toString();
+	}
+
 	return accum;
 }
 

src/io/ipc.hpp

@@ -3,6 +3,7 @@
 #include <qcontainerfwd.h>
 #include <qobjectdefs.h>
 #include <qtclasshelpermacros.h>
+#include <qtypes.h>
 
 #include "../ipc/ipc.hpp"
 
@@ -21,10 +22,12 @@ public:
 
 	[[nodiscard]] virtual const char* name() const = 0;
 	[[nodiscard]] virtual const char* genericArgumentName() const = 0;
+	[[nodiscard]] virtual qsizetype size() const = 0;
 	[[nodiscard]] virtual void* fromString(const QString& /*string*/) const { return nullptr; }
 	[[nodiscard]] virtual QString toString(void* /*slot*/) const { return ""; }
 	[[nodiscard]] virtual void* createStorage() const { return nullptr; }
 	virtual void destroyStorage(void* /*slot*/) const {}
+	void* copyStorage(const void* data) const;
 
 	static const IpcType* ipcType(const QMetaType& metaType);
 };
@@ -43,6 +46,7 @@ public:
 	[[nodiscard]] QGenericReturnArgument asGenericReturnArgument();
 
 	void replace(void* value);
+	void replace(const QVariant& value);
 
 private:
 	const IpcType* mType = nullptr;
@@ -53,6 +57,7 @@ class VoidIpcType: public IpcType {
 public:
 	[[nodiscard]] const char* name() const override;
 	[[nodiscard]] const char* genericArgumentName() const override;
+	[[nodiscard]] qsizetype size() const override;
 
 	static const VoidIpcType INSTANCE;
 };
@@ -61,6 +66,7 @@ class StringIpcType: public IpcType {
 public:
 	[[nodiscard]] const char* name() const override;
 	[[nodiscard]] const char* genericArgumentName() const override;
+	[[nodiscard]] qsizetype size() const override;
 	[[nodiscard]] void* fromString(const QString& string) const override;
 	[[nodiscard]] QString toString(void* slot) const override;
 	[[nodiscard]] void* createStorage() const override;
@@ -73,6 +79,7 @@ class IntIpcType: public IpcType {
 public:
 	[[nodiscard]] const char* name() const override;
 	[[nodiscard]] const char* genericArgumentName() const override;
+	[[nodiscard]] qsizetype size() const override;
 	[[nodiscard]] void* fromString(const QString& string) const override;
 	[[nodiscard]] QString toString(void* slot) const override;
 	[[nodiscard]] void* createStorage() const override;
@@ -85,6 +92,7 @@ class BoolIpcType: public IpcType {
 public:
 	[[nodiscard]] const char* name() const override;
 	[[nodiscard]] const char* genericArgumentName() const override;
+	[[nodiscard]] qsizetype size() const override;
 	[[nodiscard]] void* fromString(const QString& string) const override;
 	[[nodiscard]] QString toString(void* slot) const override;
 	[[nodiscard]] void* createStorage() const override;
@@ -97,6 +105,7 @@ class DoubleIpcType: public IpcType {
 public:
 	[[nodiscard]] const char* name() const override;
 	[[nodiscard]] const char* genericArgumentName() const override;
+	[[nodiscard]] qsizetype size() const override;
 	[[nodiscard]] void* fromString(const QString& string) const override;
 	[[nodiscard]] QString toString(void* slot) const override;
 	[[nodiscard]] void* createStorage() const override;
@@ -109,6 +118,7 @@ class ColorIpcType: public IpcType {
 public:
 	[[nodiscard]] const char* name() const override;
 	[[nodiscard]] const char* genericArgumentName() const override;
+	[[nodiscard]] qsizetype size() const override;
 	[[nodiscard]] void* fromString(const QString& string) const override;
 	[[nodiscard]] QString toString(void* slot) const override;
 	[[nodiscard]] void* createStorage() const override;
@@ -127,13 +137,23 @@ struct WireFunctionDefinition {
 
 DEFINE_SIMPLE_DATASTREAM_OPS(WireFunctionDefinition, data.name, data.returnType, data.arguments);
 
-struct WireTargetDefinition {
+struct WirePropertyDefinition {
 	QString name;
-	QVector<WireFunctionDefinition> functions;
+	QString type;
 
 	[[nodiscard]] QString toString() const;
 };
 
-DEFINE_SIMPLE_DATASTREAM_OPS(WireTargetDefinition, data.name, data.functions);
+DEFINE_SIMPLE_DATASTREAM_OPS(WirePropertyDefinition, data.name, data.type);
+
+struct WireTargetDefinition {
+	QString name;
+	QVector<WireFunctionDefinition> functions;
+	QVector<WirePropertyDefinition> properties;
+
+	[[nodiscard]] QString toString() const;
+};
+
+DEFINE_SIMPLE_DATASTREAM_OPS(WireTargetDefinition, data.name, data.functions, data.properties);
 
 } // namespace qs::io::ipc

src/io/ipccomm.cpp

@@ -21,16 +21,17 @@ namespace qs::io::ipc::comm {
 
 struct NoCurrentGeneration: std::monostate {};
 struct TargetNotFound: std::monostate {};
-struct FunctionNotFound: std::monostate {};
+struct EntryNotFound: std::monostate {};
 
 using QueryResponse = std::variant<
     std::monostate,
     NoCurrentGeneration,
     TargetNotFound,
-    FunctionNotFound,
+    EntryNotFound,
     QVector<WireTargetDefinition>,
     WireTargetDefinition,
-    WireFunctionDefinition>;
+    WireFunctionDefinition,
+    WirePropertyDefinition>;
 
 void QueryMetadataCommand::exec(qs::ipc::IpcServerConnection* conn) const {
 	auto resp = conn->responseStream<QueryResponse>();
@@ -44,16 +45,24 @@ void QueryMetadataCommand::exec(qs::ipc::IpcServerConnection* conn) const {
 			auto* handler = registry->findHandler(this->target);
 
 			if (handler) {
-				if (this->function.isEmpty()) {
+				if (this->name.isEmpty()) {
 					resp << handler->wireDef();
 				} else {
-					auto* func = handler->findFunction(this->function);
+					auto* func = handler->findFunction(this->name);
 
 					if (func) {
 						resp << func->wireDef();
-					} else {
+						return;
-						resp << FunctionNotFound();
 					}
+
+					auto* prop = handler->findProperty(this->name);
+
+					if (prop) {
+						resp << prop->wireDef();
+						return;
+					}
+
+					resp << EntryNotFound();
 				}
 			} else {
 				resp << TargetNotFound();
@@ -64,8 +73,8 @@ void QueryMetadataCommand::exec(qs::ipc::IpcServerConnection* conn) const {
 	}
 }
 
-int queryMetadata(IpcClient* client, const QString& target, const QString& function) {
+int queryMetadata(IpcClient* client, const QString& target, const QString& name) {
-	client->sendMessage(IpcCommand(QueryMetadataCommand {.target = target, .function = function}));
+	client->sendMessage(IpcCommand(QueryMetadataCommand {.target = target, .name = name}));
 
 	QueryResponse slot;
 	if (!client->waitForResponse(slot)) return -1;
@@ -82,9 +91,11 @@ int queryMetadata(IpcClient* client, const QString& target, const QString& funct
 		qCInfo(logBare).noquote() << std::get<WireTargetDefinition>(slot).toString();
 	} else if (std::holds_alternative<WireFunctionDefinition>(slot)) {
 		qCInfo(logBare).noquote() << std::get<WireFunctionDefinition>(slot).toString();
+	} else if (std::holds_alternative<WirePropertyDefinition>(slot)) {
+		qCInfo(logBare).noquote() << std::get<WirePropertyDefinition>(slot).toString();
 	} else if (std::holds_alternative<TargetNotFound>(slot)) {
 		qCCritical(logBare) << "Target not found.";
-	} else if (std::holds_alternative<FunctionNotFound>(slot)) {
+	} else if (std::holds_alternative<EntryNotFound>(slot)) {
 		qCCritical(logBare) << "Function not found.";
 	} else if (std::holds_alternative<NoCurrentGeneration>(slot)) {
 		qCCritical(logBare) << "Not ready to accept queries yet.";
@@ -119,7 +130,7 @@ using StringCallResponse = std::variant<
     std::monostate,
     NoCurrentGeneration,
     TargetNotFound,
-    FunctionNotFound,
+    EntryNotFound,
     ArgParseFailed,
     Completed>;
 
@@ -137,7 +148,7 @@ void StringCallCommand::exec(qs::ipc::IpcServerConnection* conn) const {
 
 		auto* func = handler->findFunction(this->function);
 		if (!func) {
-			resp << FunctionNotFound();
+			resp << EntryNotFound();
 			return;
 		}
 
@@ -223,7 +234,7 @@ int callFunction(
 		qCCritical(logBare).noquote() << "Function definition:" << error.definition.toString();
 	} else if (std::holds_alternative<TargetNotFound>(slot)) {
 		qCCritical(logBare) << "Target not found.";
-	} else if (std::holds_alternative<FunctionNotFound>(slot)) {
+	} else if (std::holds_alternative<EntryNotFound>(slot)) {
 		qCCritical(logBare) << "Function not found.";
 	} else if (std::holds_alternative<NoCurrentGeneration>(slot)) {
 		qCCritical(logBare) << "Not ready to accept queries yet.";
@@ -233,4 +244,74 @@ int callFunction(
 
 	return -1;
 }
+
+struct PropertyValue {
+	QString value;
+};
+
+DEFINE_SIMPLE_DATASTREAM_OPS(PropertyValue, data.value);
+
+using StringPropReadResponse =
+    std::variant<std::monostate, NoCurrentGeneration, TargetNotFound, EntryNotFound, PropertyValue>;
+
+void StringPropReadCommand::exec(qs::ipc::IpcServerConnection* conn) const {
+	auto resp = conn->responseStream<StringPropReadResponse>();
+
+	if (auto* generation = EngineGeneration::currentGeneration()) {
+		auto* registry = IpcHandlerRegistry::forGeneration(generation);
+
+		auto* handler = registry->findHandler(this->target);
+		if (!handler) {
+			resp << TargetNotFound();
+			return;
+		}
+
+		auto* prop = handler->findProperty(this->property);
+		if (!prop) {
+			resp << EntryNotFound();
+			return;
+		}
+
+		auto slot = IpcTypeSlot(prop->type);
+		prop->read(handler, slot);
+
+		resp << PropertyValue {
+		    .value = slot.type()->toString(slot.get()),
+		};
+	} else {
+		conn->respond(StringCallResponse(NoCurrentGeneration()));
+	}
+}
+
+int getProperty(IpcClient* client, const QString& target, const QString& property) {
+	if (target.isEmpty()) {
+		qCCritical(logBare) << "Target required to send message.";
+		return -1;
+	} else if (property.isEmpty()) {
+		qCCritical(logBare) << "Property required to send message.";
+		return -1;
+	}
+
+	client->sendMessage(IpcCommand(StringPropReadCommand {.target = target, .property = property}));
+
+	StringPropReadResponse slot;
+	if (!client->waitForResponse(slot)) return -1;
+
+	if (std::holds_alternative<PropertyValue>(slot)) {
+		auto& result = std::get<PropertyValue>(slot);
+		QTextStream(stdout) << result.value << Qt::endl;
+		return 0;
+	} else if (std::holds_alternative<TargetNotFound>(slot)) {
+		qCCritical(logBare) << "Target not found.";
+	} else if (std::holds_alternative<EntryNotFound>(slot)) {
+		qCCritical(logBare) << "Property not found.";
+	} else if (std::holds_alternative<NoCurrentGeneration>(slot)) {
+		qCCritical(logBare) << "Not ready to accept queries yet.";
+	} else {
+		qCCritical(logIpc) << "Received invalid IPC response from" << client;
+	}
+
+	return -1;
+}
+
 } // namespace qs::io::ipc::comm

src/io/ipccomm.hpp

@@ -2,6 +2,7 @@
 
 #include <qcontainerfwd.h>
 #include <qflags.h>
+#include <qtypes.h>
 
 #include "../ipc/ipc.hpp"
 
@@ -9,12 +10,12 @@ namespace qs::io::ipc::comm {
 
 struct QueryMetadataCommand {
 	QString target;
-	QString function;
+	QString name;
 
 	void exec(qs::ipc::IpcServerConnection* conn) const;
 };
 
-DEFINE_SIMPLE_DATASTREAM_OPS(QueryMetadataCommand, data.target, data.function);
+DEFINE_SIMPLE_DATASTREAM_OPS(QueryMetadataCommand, data.target, data.name);
 
 struct StringCallCommand {
 	QString target;
@@ -27,7 +28,7 @@ struct StringCallCommand {
 DEFINE_SIMPLE_DATASTREAM_OPS(StringCallCommand, data.target, data.function, data.arguments);
 
 void handleMsg(qs::ipc::IpcServerConnection* conn);
-int queryMetadata(qs::ipc::IpcClient* client, const QString& target, const QString& function);
+int queryMetadata(qs::ipc::IpcClient* client, const QString& target, const QString& name);
 
 int callFunction(
     qs::ipc::IpcClient* client,
@@ -36,4 +37,15 @@ int callFunction(
     const QVector<QString>& arguments
 );
 
+struct StringPropReadCommand {
+	QString target;
+	QString property;
+
+	void exec(qs::ipc::IpcServerConnection* conn) const;
+};
+
+DEFINE_SIMPLE_DATASTREAM_OPS(StringPropReadCommand, data.target, data.property);
+
+int getProperty(qs::ipc::IpcClient* client, const QString& target, const QString& property);
+
 } // namespace qs::io::ipc::comm

src/io/ipchandler.cpp

@@ -107,6 +107,32 @@ WireFunctionDefinition IpcFunction::wireDef() const {
 	return wire;
 }
 
+bool IpcProperty::resolve(QString& error) {
+	this->type = IpcType::ipcType(this->property.metaType());
+
+	if (!this->type) {
+		error = QString("Type %1 cannot be used across IPC.").arg(this->property.metaType().name());
+		return false;
+	}
+
+	return true;
+}
+
+void IpcProperty::read(QObject* target, IpcTypeSlot& slot) const {
+	slot.replace(this->property.read(target));
+}
+
+QString IpcProperty::toString() const {
+	return QString("property ") % this->property.name() % ": " % this->type->name();
+}
+
+WirePropertyDefinition IpcProperty::wireDef() const {
+	WirePropertyDefinition wire;
+	wire.name = this->property.name();
+	wire.type = this->type->name();
+	return wire;
+}
+
 IpcCallStorage::IpcCallStorage(const IpcFunction& function): returnSlot(function.returnType) {
 	for (const auto& arg: function.argumentTypes) {
 		this->argumentSlots.emplace_back(arg);
@@ -153,6 +179,21 @@ void IpcHandler::onPostReload() {
 		}
 	}
 
+	for (auto i = smeta.propertyCount(); i != meta->propertyCount(); i++) {
+		const auto& property = meta->property(i);
+		if (!property.isReadable() || !property.hasNotifySignal()) continue;
+
+		auto ipcProp = IpcProperty(property);
+		QString error;
+
+		if (!ipcProp.resolve(error)) {
+			qmlWarning(this).nospace().noquote()
+			    << "Error parsing property \"" << property.name() << "\": " << error;
+		} else {
+			this->propertyMap.insert(property.name(), ipcProp);
+		}
+	}
+
 	this->complete = true;
 	this->updateRegistration();
 
@@ -270,6 +311,10 @@ WireTargetDefinition IpcHandler::wireDef() const {
 		wire.functions += func.wireDef();
 	}
 
+	for (const auto& prop: this->propertyMap.values()) {
+		wire.properties += prop.wireDef();
+	}
+
 	return wire;
 }
 
@@ -307,6 +352,13 @@ IpcFunction* IpcHandler::findFunction(const QString& name) {
 	else return &*itr;
 }
 
+IpcProperty* IpcHandler::findProperty(const QString& name) {
+	auto itr = this->propertyMap.find(name);
+
+	if (itr == this->propertyMap.end()) return nullptr;
+	else return &*itr;
+}
+
 IpcHandler* IpcHandlerRegistry::findHandler(const QString& target) {
 	return this->handlers.value(target);
 }

src/io/ipchandler.hpp

@@ -53,14 +53,28 @@ private:
 	friend class IpcFunction;
 };
 
+class IpcProperty {
+public:
+	explicit IpcProperty(QMetaProperty property): property(property) {}
+
+	bool resolve(QString& error);
+	void read(QObject* target, IpcTypeSlot& slot) const;
+
+	[[nodiscard]] QString toString() const;
+	[[nodiscard]] WirePropertyDefinition wireDef() const;
+
+	QMetaProperty property;
+	const IpcType* type = nullptr;
+};
+
 class IpcHandlerRegistry;
 
 ///! Handler for IPC message calls.
 /// Each IpcHandler is registered into a per-instance map by its unique @@target.
-/// Functions defined on the IpcHandler can be called by `qs msg`.
+/// Functions and properties defined on the IpcHandler can be accessed via `qs ipc`.
 ///
 /// #### Handler Functions
-/// IPC handler functions can be called by `qs msg` as long as they have at most 10
+/// IPC handler functions can be called by `qs ipc call` as long as they have at most 10
 /// arguments, and all argument types along with the return type are listed below.
 ///
 /// **Argument and return types must be explicitly specified or they will not
@@ -112,9 +126,9 @@ class IpcHandlerRegistry;
 ///   }
 /// }
 /// ```
-/// The list of registered targets can be inspected using `qs msg -s`.
+/// The list of registered targets can be inspected using `qs ipc show`.
 /// ```sh
-/// $ qs msg -s
+/// $ qs ipc show
 /// target rect
 ///   function setColor(color: color): void
 ///   function getColor(): color
@@ -124,18 +138,22 @@ class IpcHandlerRegistry;
 ///   function getRadius(): int
 /// ```
 ///
-/// and then invoked using `qs msg`.
+/// and then invoked using `qs ipc call`.
 /// ```sh
-/// $ qs msg rect setColor orange
+/// $ qs ipc call rect setColor orange
-/// $ qs msg rect setAngle 40.5
+/// $ qs ipc call rect setAngle 40.5
-/// $ qs msg rect setRadius 30
+/// $ qs ipc call rect setRadius 30
-/// $ qs msg rect getColor
+/// $ qs ipc call rect getColor
 /// #ffffa500
-/// $ qs msg rect getAngle
+/// $ qs ipc call rect getAngle
 /// 40.5
-/// $ qs msg rect getRadius
+/// $ qs ipc call rect getRadius
 /// 30
 /// ```
+///
+/// #### Properties
+/// Properties of an IpcHanlder can be read using `qs ipc prop get` as long as they are
+/// of an IPC compatible type. See the table above for compatible types.
 class IpcHandler
     : public QObject
     , public PostReloadHook {
@@ -162,12 +180,16 @@ public:
 
 	QString listMembers(qsizetype indent);
 	[[nodiscard]] IpcFunction* findFunction(const QString& name);
+	[[nodiscard]] IpcProperty* findProperty(const QString& name);
 	[[nodiscard]] WireTargetDefinition wireDef() const;
 
 signals:
 	void enabledChanged();
 	void targetChanged();
 
+private slots:
+	//void handleIpcPropertyChange();
+
 private:
 	void updateRegistration(bool destroying = false);
 
@@ -183,6 +205,7 @@ private:
 	bool complete = false;
 
 	QHash<QString, IpcFunction> functionMap;
+	QHash<QString, IpcProperty> propertyMap;
 
 	friend class IpcHandlerRegistry;
 };

src/ipc/ipccommand.hpp

@@ -15,6 +15,7 @@ using IpcCommand = std::variant<
     std::monostate,
     IpcKillCommand,
     qs::io::ipc::comm::QueryMetadataCommand,
-    qs::io::ipc::comm::StringCallCommand>;
+    qs::io::ipc::comm::StringCallCommand,
+    qs::io::ipc::comm::StringPropReadCommand>;
 
 } // namespace qs::ipc

src/launch/command.cpp

@@ -102,9 +102,10 @@ int locateConfigFile(CommandState& cmd, QString& path) {
 	return 0;
 }
 
-void sortInstances(QVector<InstanceLockInfo>& list) {
+void sortInstances(QVector<InstanceLockInfo>& list, bool newestFirst) {
-	std::ranges::sort(list, [](const InstanceLockInfo& a, const InstanceLockInfo& b) {
+	std::ranges::sort(list, [=](const InstanceLockInfo& a, const InstanceLockInfo& b) {
-		return a.instance.launchTime < b.instance.launchTime;
+		auto r = a.instance.launchTime < b.instance.launchTime;
+		return newestFirst ? !r : r;
 	});
 };
 
@@ -153,7 +154,7 @@ int selectInstance(CommandState& cmd, InstanceLockInfo* instance) {
 		path = QDir(basePath->filePath("by-path")).filePath(pathId);
 
 		auto instances = QsPaths::collectInstances(path);
-		sortInstances(instances);
+		sortInstances(instances, cmd.config.newest);
 
 		if (instances.isEmpty()) {
 			qCInfo(logBare) << "No running instances for" << configFilePath;
@@ -227,7 +228,7 @@ int listInstances(CommandState& cmd) {
 			qCInfo(logBare) << "Use --all to list all instances.";
 		}
 	} else {
-		sortInstances(instances);
+		sortInstances(instances, cmd.config.newest);
 
 		if (cmd.output.json) {
 			auto array = QJsonArray();
@@ -284,26 +285,23 @@ int killInstances(CommandState& cmd) {
 	});
 }
 
-int msgInstance(CommandState& cmd) {
+int ipcCommand(CommandState& cmd) {
 	InstanceLockInfo instance;
 	auto r = selectInstance(cmd, &instance);
 	if (r != 0) return r;
 
 	return IpcClient::connect(instance.instance.instanceId, [&](IpcClient& client) {
-		if (cmd.ipc.info) {
+		if (*cmd.ipc.show || cmd.ipc.showOld) {
-			return qs::io::ipc::comm::queryMetadata(&client, *cmd.ipc.target, *cmd.ipc.function);
+			return qs::io::ipc::comm::queryMetadata(&client, *cmd.ipc.target, *cmd.ipc.name);
+		} else if (*cmd.ipc.getprop) {
+			return qs::io::ipc::comm::getProperty(&client, *cmd.ipc.target, *cmd.ipc.name);
 		} else {
 			QVector<QString> arguments;
 			for (auto& arg: cmd.ipc.arguments) {
 				arguments += *arg;
 			}
 
-			return qs::io::ipc::comm::callFunction(
+			return qs::io::ipc::comm::callFunction(&client, *cmd.ipc.target, *cmd.ipc.name, arguments);
-			    &client,
-			    *cmd.ipc.target,
-			    *cmd.ipc.function,
-			    arguments
-			);
 		}
 
 		return -1;
@@ -422,8 +420,8 @@ int runCommand(int argc, char** argv, QCoreApplication* coreApplication) {
 		return listInstances(state);
 	} else if (*state.subcommand.kill) {
 		return killInstances(state);
-	} else if (*state.subcommand.msg) {
+	} else if (*state.subcommand.msg || *state.ipc.ipc) {
-		return msgInstance(state);
+		return ipcCommand(state);
 	} else {
 		if (strcmp(qVersion(), QT_VERSION_STR) != 0) {
 			qWarning() << "\033[31mQuickshell was built against Qt" << QT_VERSION_STR

src/launch/launch_p.hpp

@@ -49,6 +49,7 @@ struct CommandState {
 		QStringOption path;
 		QStringOption manifest;
 		QStringOption name;
+		bool newest = false;
 	} config;
 
 	struct {
@@ -67,9 +68,13 @@ struct CommandState {
 	} output;
 
 	struct {
-		bool info = false;
+		CLI::App* ipc = nullptr;
+		CLI::App* show = nullptr;
+		CLI::App* call = nullptr;
+		CLI::App* getprop = nullptr;
+		bool showOld = false;
 		QStringOption target;
-		QStringOption function;
+		QStringOption name;
 		std::vector<QStringOption> arguments;
 	} ipc;
 

src/launch/parsecommand.cpp

@@ -16,7 +16,7 @@ int parseCommand(int argc, char** argv, CommandState& state) {
 	    .argv = argv,
 	};
 
-	auto addConfigSelection = [&](CLI::App* cmd) {
+	auto addConfigSelection = [&](CLI::App* cmd, bool withNewestOption = false) {
 		auto* group = cmd->add_option_group("Config Selection")
 		                  ->description("If no options in this group are specified,\n"
 		                                "$XDG_CONFIG_HOME/quickshell/shell.qml will be used.");
@@ -37,6 +37,11 @@ int parseCommand(int argc, char** argv, CommandState& state) {
 		                  "otherwise it is the name of a folder in $XDG_CONFIG_HOME/quickshell.")
 		    ->envname("QS_CONFIG_NAME");
 
+		if (withNewestOption) {
+			group->add_flag("-n,--newest", state.config.newest)
+			    ->description("Operate on the most recently launched instance instead of the oldest");
+		}
+
 		return group;
 	};
 
@@ -130,7 +135,7 @@ int parseCommand(int argc, char** argv, CommandState& state) {
 		    ->description("Rules to apply to the log being read, in the format of QT_LOGGING_RULES.");
 
 		auto* instance = addInstanceSelection(sub)->excludes(file);
-		addConfigSelection(sub)->excludes(instance)->excludes(file);
+		addConfigSelection(sub, true)->excludes(instance)->excludes(file);
 		addLoggingOptions(sub, false);
 
 		state.subcommand.log = sub;
@@ -146,7 +151,7 @@ int parseCommand(int argc, char** argv, CommandState& state) {
 
 		sub->add_flag("-j,--json", state.output.json, "Output the list as a json.");
 
-		addConfigSelection(sub)->excludes(all);
+		addConfigSelection(sub, true)->excludes(all);
 		addLoggingOptions(sub, false, true);
 
 		state.subcommand.list = sub;
@@ -156,36 +161,71 @@ int parseCommand(int argc, char** argv, CommandState& state) {
 		auto* sub = cli->add_subcommand("kill", "Kill quickshell instances.");
 		//sub->add_flag("-a,--all", "Kill all matching instances instead of just one.");
 		auto* instance = addInstanceSelection(sub);
-		addConfigSelection(sub)->excludes(instance);
+		addConfigSelection(sub, true)->excludes(instance);
 		addLoggingOptions(sub, false, true);
 
 		state.subcommand.kill = sub;
 	}
 
 	{
-		auto* sub = cli->add_subcommand("msg", "Send messages to IpcHandlers.")->require_option();
+		auto* sub = cli->add_subcommand("ipc", "Communicate with other Quickshell instances.")
-
+		                ->require_subcommand();
-		auto* target = sub->add_option("target", state.ipc.target, "The target to message.");
+		state.ipc.ipc = sub;
-
-		auto* function = sub->add_option("function", state.ipc.function)
-		                     ->description("The function to call in the target.")
-		                     ->needs(target);
-
-		auto* arguments = sub->add_option("arguments", state.ipc.arguments)
-		                      ->description("Arguments to the called function.")
-		                      ->needs(function)
-		                      ->allow_extra_args();
-
-		sub->add_flag("-s,--show", state.ipc.info)
-		    ->description("Print information about a function or target if given, or all available "
-		                  "targets if not.")
-		    ->excludes(arguments);
 
 		auto* instance = addInstanceSelection(sub);
-		addConfigSelection(sub)->excludes(instance);
+		addConfigSelection(sub, true)->excludes(instance);
 		addLoggingOptions(sub, false, true);
 
-		sub->require_option();
+		{
+			auto* show = sub->add_subcommand("show", "Print information about available IPC targets.");
+			state.ipc.show = show;
+		}
+
+		{
+			auto* call = sub->add_subcommand("call", "Call an IpcHandler function.");
+			state.ipc.call = call;
+
+			call->add_option("target", state.ipc.target, "The target to message.");
+
+			call->add_option("function", state.ipc.name)
+			    ->description("The function to call in the target.");
+
+			call->add_option("arguments", state.ipc.arguments)
+			    ->description("Arguments to the called function.")
+			    ->allow_extra_args();
+		}
+
+		{
+			auto* prop =
+			    sub->add_subcommand("prop", "Manipulate IpcHandler properties.")->require_subcommand();
+
+			{
+				auto* get = prop->add_subcommand("get", "Read the value of a property.");
+				state.ipc.getprop = get;
+				get->add_option("target", state.ipc.target, "The target to read the property of.");
+				get->add_option("property", state.ipc.name)->description("The property to read.");
+			}
+		}
+	}
+
+	{
+		auto* sub = cli->add_subcommand("msg", "[DEPRECATED] Moved to `ipc call`.")->require_option();
+
+		sub->add_option("target", state.ipc.target, "The target to message.");
+
+		sub->add_option("function", state.ipc.name)->description("The function to call in the target.");
+
+		sub->add_option("arguments", state.ipc.arguments)
+		    ->description("Arguments to the called function.")
+		    ->allow_extra_args();
+
+		sub->add_flag("-s,--show", state.ipc.showOld)
+		    ->description("Print information about a function or target if given, or all available "
+		                  "targets if not.");
+
+		auto* instance = addInstanceSelection(sub);
+		addConfigSelection(sub, true)->excludes(instance);
+		addLoggingOptions(sub, false, true);
 
 		state.subcommand.msg = sub;
 	}

src/services/notifications/dbusimage.hpp

@@ -1,7 +1,5 @@
 #pragma once
 
-#include <utility>
-
 #include <qdbusargument.h>
 #include <qimage.h>
 #include <qobject.h>
@@ -23,14 +21,22 @@ struct DBusNotificationImage {
 const QDBusArgument& operator>>(const QDBusArgument& argument, DBusNotificationImage& pixmap);
 const QDBusArgument& operator<<(QDBusArgument& argument, const DBusNotificationImage& pixmap);
 
-class NotificationImage: public QsImageHandle {
+class NotificationImage: public QsIndexedImageHandle {
 public:
-	explicit NotificationImage(DBusNotificationImage image, QObject* parent)
+	explicit NotificationImage(): QsIndexedImageHandle(QQuickAsyncImageProvider::Image) {}
-	    : QsImageHandle(QQuickAsyncImageProvider::Image, parent)
+
-	    , image(std::move(image)) {}
+	[[nodiscard]] bool hasData() const { return !this->image.data.isEmpty(); }
+	void clear() { this->image.data.clear(); }
+
+	[[nodiscard]] DBusNotificationImage& writeImage() {
+		this->imageChanged();
+		return this->image;
+	}
 
 	QImage requestImage(const QString& id, QSize* size, const QSize& requestedSize) override;
 
+private:
 	DBusNotificationImage image;
 };
+
 } // namespace qs::service::notifications

src/services/notifications/notification.cpp

@@ -1,5 +1,4 @@
 #include "notification.hpp"
-#include <utility>
 
 #include <qcontainerfwd.h>
 #include <qdbusargument.h>
@@ -117,13 +116,12 @@ void Notification::updateProperties(
 
 	QString imagePath;
 
-	if (!imageDataName.isEmpty()) {
+	if (imageDataName.isEmpty()) {
+		this->mImagePixmap.clear();
+	} else {
 		auto value = hints.value(imageDataName).value<QDBusArgument>();
-		DBusNotificationImage image;
+		value >> this->mImagePixmap.writeImage();
-		value >> image;
+		imagePath = this->mImagePixmap.url();
-		if (this->mImagePixmap) this->mImagePixmap->deleteLater();
-		this->mImagePixmap = new NotificationImage(std::move(image), this);
-		imagePath = this->mImagePixmap->url();
 	}
 
 	// don't store giant byte arrays longer than necessary
@@ -131,7 +129,7 @@ void Notification::updateProperties(
 	hints.remove("image_data");
 	hints.remove("icon_data");
 
-	if (!this->mImagePixmap) {
+	if (!this->mImagePixmap.hasData()) {
 		QString imagePathName;
 		if (hints.contains("image-path")) imagePathName = "image-path";
 		else if (hints.contains("image_path")) imagePathName = "image_path";

src/services/notifications/notification.hpp

@@ -12,11 +12,10 @@
 
 #include "../../core/retainable.hpp"
 #include "../../core/util.hpp"
+#include "dbusimage.hpp"
 
 namespace qs::service::notifications {
 
-class NotificationImage;
-
 ///! The urgency level of a Notification.
 /// See @@Notification.urgency.
 class NotificationUrgency: public QObject {
@@ -187,7 +186,7 @@ private:
 	quint32 mId;
 	NotificationCloseReason::Enum mCloseReason = NotificationCloseReason::Dismissed;
 	bool mLastGeneration = false;
-	NotificationImage* mImagePixmap = nullptr;
+	NotificationImage mImagePixmap;
 	QList<NotificationAction*> mActions;
 
 	// clang-format off

src/services/status_notifier/item.cpp

@@ -282,7 +282,7 @@ void StatusNotifierItem::onGetAllFailed() const {
 }
 
 TrayImageHandle::TrayImageHandle(StatusNotifierItem* item)
-    : QsImageHandle(QQmlImageProviderBase::Pixmap, item)
+    : QsImageHandle(QQmlImageProviderBase::Pixmap)
     , item(item) {}
 
 QPixmap

src/wayland/hyprland/surface/hyprland-surface-v1.xml

@@ -34,7 +34,7 @@
     This protocol exposes hyprland-specific wl_surface properties.
   </description>
 
-  <interface name="hyprland_surface_manager_v1" version="1">
+  <interface name="hyprland_surface_manager_v1" version="2">
     <description summary="manager for hyprland surface objects">
       This interface allows a client to create hyprland surface objects.
     </description>
@@ -63,7 +63,7 @@
     </enum>
   </interface>
 
-  <interface name="hyprland_surface_v1" version="1">
+  <interface name="hyprland_surface_v1" version="2">
     <description summary="hyprland-specific wl_surface properties">
       This interface allows access to hyprland-specific properties of a wl_surface.
 
@@ -96,5 +96,31 @@
       <entry name="no_surface" value="0" summary="wl_surface was destroyed"/>
       <entry name="out_of_range" value="1" summary="given opacity was not in the range 0.0 - 1.0 (inclusive)"/>
     </enum>
+
+    <request name="set_visible_region" since="2">
+      <description summary="set the visible region of the surface">
+        This request sets the region of the surface that contains visible content.
+        Visible content refers to content that has an alpha value greater than zero.
+
+        The visible region is an optimization hint for the compositor that lets it
+        avoid drawing parts of the surface that are not visible. Setting a visible region
+        that does not contain all content in the surface may result in missing content
+        not being drawn.
+
+        The visible region is specified in buffer-local coordinates.
+
+        The compositor ignores the parts of the visible region that fall outside of the surface.
+        When all parts of the region fall outside of the buffer geometry, the compositor may
+        avoid rendering the surface entirely.
+
+        The initial value for the visible region is empty. Setting the
+        visible region has copy semantics, and the wl_region object can be destroyed immediately.
+        A NULL wl_region causes the visible region to be set to empty.
+
+        Does not take effect until wl_surface.commit is called.
+      </description>
+
+      <arg name="region" type="object" interface="wl_region" allow-null="true"/>
+    </request>
   </interface>
 </protocol>

src/wayland/hyprland/surface/manager.cpp

@@ -7,13 +7,13 @@
 
 namespace qs::hyprland::surface::impl {
 
-HyprlandSurfaceManager::HyprlandSurfaceManager(): QWaylandClientExtensionTemplate(1) {
+HyprlandSurfaceManager::HyprlandSurfaceManager(): QWaylandClientExtensionTemplate(2) {
 	this->initialize();
 }
 
 HyprlandSurface*
 HyprlandSurfaceManager::createHyprlandExtension(QtWaylandClient::QWaylandWindow* surface) {
-	return new HyprlandSurface(this->get_hyprland_surface(surface->surface()));
+	return new HyprlandSurface(this->get_hyprland_surface(surface->surface()), surface);
 }
 
 HyprlandSurfaceManager* HyprlandSurfaceManager::instance() {

src/wayland/hyprland/surface/qml.cpp

@@ -1,17 +1,20 @@
 #include "qml.hpp"
 #include <memory>
 
+#include <private/qhighdpiscaling_p.h>
 #include <private/qwaylandwindow_p.h>
 #include <qlogging.h>
 #include <qobject.h>
 #include <qqmlinfo.h>
+#include <qregion.h>
 #include <qtmetamacros.h>
 #include <qtypes.h>
+#include <qvariant.h>
 #include <qwindow.h>
 
+#include "../../../core/region.hpp"
 #include "../../../window/proxywindow.hpp"
 #include "../../../window/windowinterface.hpp"
-#include "../../util.hpp"
 #include "manager.hpp"
 #include "surface.hpp"
 
@@ -40,6 +43,15 @@ HyprlandWindow::HyprlandWindow(ProxyWindowBase* window): QObject(nullptr), proxy
 	    &HyprlandWindow::onWindowConnected
 	);
 
+	QObject::connect(window, &ProxyWindowBase::polished, this, &HyprlandWindow::onWindowPolished);
+
+	QObject::connect(
+	    window,
+	    &ProxyWindowBase::devicePixelRatioChanged,
+	    this,
+	    &HyprlandWindow::updateVisibleMask
+	);
+
 	QObject::connect(window, &QObject::destroyed, this, &HyprlandWindow::onProxyWindowDestroyed);
 
 	if (window->backingWindow()) {
@@ -60,14 +72,76 @@ void HyprlandWindow::setOpacity(qreal opacity) {
 
 	this->mOpacity = opacity;
 
-	if (this->surface) {
+	if (this->surface && this->proxyWindow) {
-		this->surface->setOpacity(opacity);
+		this->pendingPolish.opacity = true;
-		qs::wayland::util::scheduleCommit(this->proxyWindow);
+		this->proxyWindow->schedulePolish();
 	}
 
 	emit this->opacityChanged();
 }
 
+PendingRegion* HyprlandWindow::visibleMask() const { return this->mVisibleMask; }
+
+void HyprlandWindow::setVisibleMask(PendingRegion* mask) {
+	if (mask == this->mVisibleMask) return;
+
+	if (this->mVisibleMask) {
+		QObject::disconnect(this->mVisibleMask, nullptr, this, nullptr);
+	}
+
+	this->mVisibleMask = mask;
+
+	if (mask) {
+		QObject::connect(mask, &QObject::destroyed, this, &HyprlandWindow::onVisibleMaskDestroyed);
+		QObject::connect(mask, &PendingRegion::changed, this, &HyprlandWindow::updateVisibleMask);
+	}
+
+	this->updateVisibleMask();
+	emit this->visibleMaskChanged();
+}
+
+void HyprlandWindow::onVisibleMaskDestroyed() {
+	this->mVisibleMask = nullptr;
+	this->updateVisibleMask();
+	emit this->visibleMaskChanged();
+}
+
+void HyprlandWindow::updateVisibleMask() {
+	if (!this->surface || !this->proxyWindow) return;
+
+	this->pendingPolish.visibleMask = true;
+	this->proxyWindow->schedulePolish();
+}
+
+void HyprlandWindow::onWindowPolished() {
+	if (!this->surface) return;
+
+	if (this->pendingPolish.opacity) {
+		this->surface->setOpacity(this->mOpacity);
+		this->pendingPolish.opacity = false;
+	}
+
+	if (this->pendingPolish.visibleMask) {
+		QRegion mask;
+		if (this->mVisibleMask != nullptr) {
+			mask =
+			    this->mVisibleMask->applyTo(QRect(0, 0, this->mWindow->width(), this->mWindow->height()));
+		}
+
+		auto dpr = this->proxyWindow->devicePixelRatio();
+		if (dpr != 1.0) {
+			mask = QHighDpi::scale(mask, dpr);
+		}
+
+		if (mask.isEmpty() && this->mVisibleMask) {
+			mask = QRect(-1, -1, 1, 1);
+		}
+
+		this->surface->setVisibleRegion(mask);
+		this->pendingPolish.visibleMask = false;
+	}
+}
+
 void HyprlandWindow::onWindowConnected() {
 	this->mWindow = this->proxyWindow->backingWindow();
 	// disconnected by destructor
@@ -86,11 +160,24 @@ void HyprlandWindow::onWindowVisibleChanged() {
 		if (!this->mWindow->handle()) {
 			this->mWindow->create();
 		}
+	}
 
-		this->mWaylandWindow = dynamic_cast<QWaylandWindow*>(this->mWindow->handle());
+	auto* window = dynamic_cast<QWaylandWindow*>(this->mWindow->handle());
+	if (window == this->mWaylandWindow) return;
 
 	if (this->mWaylandWindow) {
-			// disconnected by destructor
+		QObject::disconnect(this->mWaylandWindow, nullptr, this, nullptr);
+	}
+
+	this->mWaylandWindow = window;
+	if (!window) return;
+
+	QObject::connect(
+	    this->mWaylandWindow,
+	    &QObject::destroyed,
+	    this,
+	    &HyprlandWindow::onWaylandWindowDestroyed
+	);
 
 	QObject::connect(
 	    this->mWaylandWindow,
@@ -109,10 +196,10 @@ void HyprlandWindow::onWindowVisibleChanged() {
 	if (this->mWaylandWindow->surface()) {
 		this->onWaylandSurfaceCreated();
 	}
-		}
-	}
 }
 
+void HyprlandWindow::onWaylandWindowDestroyed() { this->mWaylandWindow = nullptr; }
+
 void HyprlandWindow::onWaylandSurfaceCreated() {
 	auto* manager = impl::HyprlandSurfaceManager::instance();
 
@@ -122,12 +209,26 @@ void HyprlandWindow::onWaylandSurfaceCreated() {
 		return;
 	}
 
+	auto v = this->mWaylandWindow->property("hyprland_window_ext");
+	if (v.canConvert<HyprlandWindow*>()) {
+		auto* windowExt = v.value<HyprlandWindow*>();
+		if (windowExt != this && windowExt->surface) {
+			this->surface.swap(windowExt->surface);
+		}
+	}
+
+	if (!this->surface) {
 		auto* ext = manager->createHyprlandExtension(this->mWaylandWindow);
 		this->surface = std::unique_ptr<impl::HyprlandSurface>(ext);
+	}
 
-	if (this->mOpacity != 1.0) {
+	this->mWaylandWindow->setProperty("hyprland_window_ext", QVariant::fromValue(this));
-		this->surface->setOpacity(this->mOpacity);
+
-		qs::wayland::util::scheduleCommit(this->proxyWindow);
+	this->pendingPolish.opacity = this->mOpacity != 1.0;
+	this->pendingPolish.visibleMask = this->mVisibleMask;
+
+	if (this->pendingPolish.opacity || this->pendingPolish.visibleMask) {
+		this->proxyWindow->schedulePolish();
 	}
 }
 
@@ -144,8 +245,9 @@ void HyprlandWindow::onProxyWindowDestroyed() {
 	// Deleting it when the proxy window is deleted will cause a full opacity frame between the destruction of the
 	// hyprland_surface_v1 and wl_surface objects.
 
-	if (this->surface == nullptr) {
 	this->proxyWindow = nullptr;
+
+	if (this->surface == nullptr) {
 		this->deleteLater();
 	}
 }

src/wayland/hyprland/surface/qml.hpp

@@ -9,6 +9,7 @@
 #include <qtypes.h>
 #include <qwindow.h>
 
+#include "../../../core/region.hpp"
 #include "../../../window/proxywindow.hpp"
 #include "surface.hpp"
 
@@ -31,11 +32,18 @@ namespace qs::hyprland::surface {
 /// [hyprland-surface-v1]: https://github.com/hyprwm/hyprland-protocols/blob/main/protocols/hyprland-surface-v1.xml
 class HyprlandWindow: public QObject {
 	Q_OBJECT;
+	// clang-format off
 	/// A multiplier for the window's overall opacity, ranging from 1.0 to 0.0. Overall opacity includes the opacity of
 	/// both the window content *and* visual effects such as blur that apply to it.
 	///
 	/// Default: 1.0
 	Q_PROPERTY(qreal opacity READ opacity WRITE setOpacity NOTIFY opacityChanged);
+	/// A hint to the compositor that only certain regions of the surface should be rendered.
+	/// This can be used to avoid rendering large empty regions of a window which can increase
+	/// performance, especially if the window is blurred. The mask should include all pixels
+	/// of the window that do not have an alpha value of 0.
+	Q_PROPERTY(PendingRegion* visibleMask READ visibleMask WRITE setVisibleMask NOTIFY visibleMaskChanged);
+	// clang-format on
 	QML_ELEMENT;
 	QML_UNCREATABLE("HyprlandWindow can only be used as an attached object.");
 	QML_ATTACHED(HyprlandWindow);
@@ -48,17 +56,25 @@ public:
 	[[nodiscard]] qreal opacity() const;
 	void setOpacity(qreal opacity);
 
+	[[nodiscard]] PendingRegion* visibleMask() const;
+	virtual void setVisibleMask(PendingRegion* mask);
+
 	static HyprlandWindow* qmlAttachedProperties(QObject* object);
 
 signals:
 	void opacityChanged();
+	void visibleMaskChanged();
 
 private slots:
 	void onWindowConnected();
 	void onWindowVisibleChanged();
+	void onWaylandWindowDestroyed();
 	void onWaylandSurfaceCreated();
 	void onWaylandSurfaceDestroyed();
 	void onProxyWindowDestroyed();
+	void onVisibleMaskDestroyed();
+	void onWindowPolished();
+	void updateVisibleMask();
 
 private:
 	void disconnectWaylandWindow();
@@ -67,7 +83,13 @@ private:
 	QWindow* mWindow = nullptr;
 	QtWaylandClient::QWaylandWindow* mWaylandWindow = nullptr;
 
+	struct {
+		bool opacity : 1 = false;
+		bool visibleMask : 1 = false;
+	} pendingPolish;
+
 	qreal mOpacity = 1.0;
+	PendingRegion* mVisibleMask = nullptr;
 	std::unique_ptr<impl::HyprlandSurface> surface;
 };
 

src/wayland/hyprland/surface/surface.cpp

@@ -1,19 +1,53 @@
 #include "surface.hpp"
+#include <cmath>
 
+#include <private/qwaylanddisplay_p.h>
+#include <private/qwaylandintegration_p.h>
+#include <qlogging.h>
+#include <qregion.h>
 #include <qtypes.h>
 #include <qwayland-hyprland-surface-v1.h>
+#include <wayland-client-protocol.h>
 #include <wayland-hyprland-surface-v1-client-protocol.h>
 #include <wayland-util.h>
 
 namespace qs::hyprland::surface::impl {
 
-HyprlandSurface::HyprlandSurface(::hyprland_surface_v1* surface)
+HyprlandSurface::HyprlandSurface(
-    : QtWayland::hyprland_surface_v1(surface) {}
+    ::hyprland_surface_v1* surface,
+    QtWaylandClient::QWaylandWindow* backer
+)
+    : QtWayland::hyprland_surface_v1(surface)
+    , backer(backer)
+    , backerSurface(backer->surface()) {}
 
 HyprlandSurface::~HyprlandSurface() { this->destroy(); }
 
+bool HyprlandSurface::surfaceEq(wl_surface* surface) const {
+	return surface == this->backerSurface;
+}
+
 void HyprlandSurface::setOpacity(qreal opacity) {
 	this->set_opacity(wl_fixed_from_double(opacity));
 }
 
+void HyprlandSurface::setVisibleRegion(const QRegion& region) {
+	if (this->version() < HYPRLAND_SURFACE_V1_SET_VISIBLE_REGION_SINCE_VERSION) {
+		qWarning() << "Cannot set hyprland surface visible region: compositor does not support "
+		              "hyprland_surface_v1.set_visible_region";
+		return;
+	}
+
+	if (region.isEmpty()) {
+		this->set_visible_region(nullptr);
+	} else {
+		static const auto* waylandIntegration = QtWaylandClient::QWaylandIntegration::instance();
+		auto* display = waylandIntegration->display();
+
+		auto* wlRegion = display->createRegion(region);
+		this->set_visible_region(wlRegion);
+		wl_region_destroy(wlRegion); // NOLINT(misc-include-cleaner)
+	}
+}
+
 } // namespace qs::hyprland::surface::impl

src/wayland/hyprland/surface/surface.hpp

@@ -1,21 +1,31 @@
 #pragma once
 
+#include <private/qwaylandwindow_p.h>
 #include <qobject.h>
+#include <qregion.h>
 #include <qtclasshelpermacros.h>
 #include <qtmetamacros.h>
 #include <qtypes.h>
 #include <qwayland-hyprland-surface-v1.h>
+#include <wayland-client-protocol.h>
 #include <wayland-hyprland-surface-v1-client-protocol.h>
 
 namespace qs::hyprland::surface::impl {
 
 class HyprlandSurface: public QtWayland::hyprland_surface_v1 {
 public:
-	explicit HyprlandSurface(::hyprland_surface_v1* surface);
+	explicit HyprlandSurface(::hyprland_surface_v1* surface, QtWaylandClient::QWaylandWindow* backer);
 	~HyprlandSurface() override;
 	Q_DISABLE_COPY_MOVE(HyprlandSurface);
 
+	[[nodiscard]] bool surfaceEq(wl_surface* surface) const;
+
 	void setOpacity(qreal opacity);
+	void setVisibleRegion(const QRegion& region);
+
+private:
+	QtWaylandClient::QWaylandWindow* backer;
+	wl_surface* backerSurface = nullptr;
 };
 
 } // namespace qs::hyprland::surface::impl

src/wayland/wlr_layershell.cpp

@@ -90,8 +90,8 @@ void WlrLayershell::setHeight(qint32 height) {
 }
 
 void WlrLayershell::setScreen(QuickshellScreenInfo* screen) {
-	this->ProxyWindowBase::setScreen(screen);
 	this->ext->setUseWindowScreen(screen != nullptr);
+	this->ProxyWindowBase::setScreen(screen);
 }
 
 // NOLINTBEGIN

src/window/proxywindow.cpp

@@ -3,6 +3,7 @@
 #include <private/qquickwindow_p.h>
 #include <qcoreevent.h>
 #include <qevent.h>
+#include <qguiapplication.h>
 #include <qnamespace.h>
 #include <qobject.h>
 #include <qqmlcontext.h>
@@ -200,9 +201,6 @@ void ProxyWindowBase::completeWindow() {
 	if (this->mScreen != nullptr && this->window->screen() != this->mScreen) {
 		if (this->window->isVisible()) this->window->setVisible(false);
 		this->window->setScreen(this->mScreen);
-	} else if (this->mScreen == nullptr) {
-		this->mScreen = this->window->screen();
-		QObject::connect(this->mScreen, &QObject::destroyed, this, &ProxyWindowBase::onScreenDestroyed);
 	}
 
 	this->setWidth(this->mWidth);
@@ -327,39 +325,39 @@ void ProxyWindowBase::setHeight(qint32 height) {
 
 void ProxyWindowBase::setScreen(QuickshellScreenInfo* screen) {
 	auto* qscreen = screen == nullptr ? nullptr : screen->screen;
-	if (qscreen == this->mScreen) return;
+	auto newMScreen = this->mScreen != qscreen;
 
-	if (this->mScreen != nullptr) {
+	if (this->mScreen && newMScreen) {
 		QObject::disconnect(this->mScreen, nullptr, this, nullptr);
 	}
 
+	if (this->qscreen() != qscreen) {
+		this->mScreen = qscreen;
 		if (this->window == nullptr) {
 			emit this->screenChanged();
-	} else {
+		} else if (qscreen) {
 			auto reshow = this->isVisibleDirect();
 			if (reshow) this->setVisibleDirect(false);
 			if (this->window != nullptr) this->window->setScreen(qscreen);
 			if (reshow) this->setVisibleDirect(true);
 		}
+	}
 
-	if (qscreen) this->mScreen = qscreen;
+	if (qscreen && newMScreen) {
-	else this->mScreen = this->window->screen();
-
 		QObject::connect(this->mScreen, &QObject::destroyed, this, &ProxyWindowBase::onScreenDestroyed);
+	}
 }
 
 void ProxyWindowBase::onScreenDestroyed() { this->mScreen = nullptr; }
 
+QScreen* ProxyWindowBase::qscreen() const {
+	if (this->window) return this->window->screen();
+	if (this->mScreen) return this->mScreen;
+	return QGuiApplication::primaryScreen();
+}
+
 QuickshellScreenInfo* ProxyWindowBase::screen() const {
-	QScreen* qscreen = nullptr;
+	return QuickshellTracked::instance()->screenInfo(this->qscreen());
-
-	if (this->window == nullptr) {
-		if (this->mScreen != nullptr) qscreen = this->mScreen;
-	} else {
-		qscreen = this->window->screen();
-	}
-
-	return QuickshellTracked::instance()->screenInfo(qscreen);
 }
 
 QColor ProxyWindowBase::color() const { return this->mColor; }

src/window/proxywindow.hpp

@@ -100,7 +100,8 @@ public:
 
 	[[nodiscard]] qreal devicePixelRatio() const;
 
-	[[nodiscard]] virtual QuickshellScreenInfo* screen() const;
+	[[nodiscard]] QScreen* qscreen() const;
+	[[nodiscard]] QuickshellScreenInfo* screen() const;
 	virtual void setScreen(QuickshellScreenInfo* screen);
 
 	[[nodiscard]] QColor color() const;