#include <qwasmbackingstore.h>

Inheritance diagram for QWasmBackingStore:

Collaboration diagram for QWasmBackingStore:

Public Member Functions
	QWasmBackingStore (QWasmCompositor compositor, QWindow window)

	~QWasmBackingStore ()

QPaintDevice *	paintDevice () override
	Implement this function to return the appropriate paint device.

void	beginPaint (const QRegion &) override
	This function is called before painting onto the surface begins, with the region in which the painting will occur.

void	flush (QWindow *window, const QRegion &region, const QPoint &offset) override
	Flushes the given region from the specified window.

void	resize (const QSize &size, const QRegion &staticContents) override

QImage	toImage () const override
	Implemented in subclasses to return the content of the backingstore as a QImage.

const QImage &	getImageRef () const

emscripten::val	getUpdatedWebImage (QWasmWindow *window)

Public Member Functions inherited from QPlatformBackingStore
	QPlatformBackingStore (QWindow *window)
	Constructs an empty surface for the given top-level window.

virtual	~QPlatformBackingStore ()
	Destroys this surface.

QWindow *	window () const
	Returns a pointer to the top-level window associated with this surface.

QBackingStore *	backingStore () const
	Returns a pointer to the backing store associated with this surface.

virtual FlushResult	rhiFlush (QWindow window, qreal sourceDevicePixelRatio, const QRegion &region, const QPoint &offset, QPlatformTextureList textures, bool translucentBackground)
	Flushes the given region from the specified window, and compositing it with the specified textures list.

virtual QRhiTexture *	toTexture (QRhiResourceUpdateBatch resourceUpdates, const QRegion &dirtyRegion, TextureFlags flags) const
	May be reimplemented in subclasses to return the content of the backingstore as an QRhiTexture.

virtual QPlatformGraphicsBuffer *	graphicsBuffer () const
	Accessor for a backingstores graphics buffer abstraction.

virtual bool	scroll (const QRegion &area, int dx, int dy)
	Scrolls the given area dx pixels to the right and dy downward; both dx and dy may be negative.

virtual void	endPaint ()
	This function is called after painting onto the surface has ended.

void	setRhiConfig (const QPlatformBackingStoreRhiConfig &config)

QRhi *	rhi () const

void	surfaceAboutToBeDestroyed ()

void	graphicsDeviceReportedLost ()

Protected Member Functions
void	updateTexture (QWasmWindow *window)

Additional Inherited Members
Public Types inherited from QPlatformBackingStore
enum	FlushResult { FlushSuccess , FlushFailed , FlushFailedDueToLostDevice }

enum	TextureFlag { TextureSwizzle = 0x01 , TextureFlip = 0x02 , TexturePremultiplied = 0x04 }

Detailed Description

Definition at line 19 of file qwasmbackingstore.h.

Constructor & Destructor Documentation

◆ QWasmBackingStore()

QT_BEGIN_NAMESPACE QWasmBackingStore::QWasmBackingStore	(	QWasmCompositor *	compositor,
		QWindow *	window )

Definition at line 17 of file qwasmbackingstore.cpp.

References QWasmWindow::setBackingStore(), and QPlatformBackingStore::window().

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◆ ~QWasmBackingStore()

QWasmBackingStore::~QWasmBackingStore ( )

Definition at line 25 of file qwasmbackingstore.cpp.

References QWasmIntegration::get(), QWasmWindow::setBackingStore(), and QPlatformBackingStore::window().

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Member Function Documentation

◆ beginPaint()

void QWasmBackingStore::beginPaint ( const QRegion & )

overridevirtual

This function is called before painting onto the surface begins, with the region in which the painting will occur.

See also: endPaint(), paintDevice()

Reimplemented from QPlatformBackingStore.

Definition at line 85 of file qwasmbackingstore.cpp.

References QPlatformBackingStore::backingStore(), QPainter::CompositionMode_Source, QImage::devicePixelRatio(), QPainter::fillRect(), QImage::hasAlphaChannel(), painter, rect, resize(), QPainter::setCompositionMode(), Qt::transparent, and QPlatformBackingStore::window().

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◆ flush()

void QWasmBackingStore::flush	(	QWindow *	window,
		const QRegion &	region,
		const QPoint &	offset )

overridevirtual

Flushes the given region from the specified window.

Note: region is relative to the window which may not be top-level in case window corresponds to a native child widget. offset is the position of the native child relative to the top-level window.

Unlike rhiFlush(), this function's default implementation does nothing. It is expected that subclasses provide a platform-specific (non-QRhi-based) implementation, if applicable on the given platform.

See also: rhiFlush()

Reimplemented from QPlatformBackingStore.

Definition at line 39 of file qwasmbackingstore.cpp.

References QWasmCompositor::handleBackingStoreFlush(), Q_UNUSED, and QPlatformBackingStore::window().

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◆ getImageRef()

const QImage & QWasmBackingStore::getImageRef ( ) const

Definition at line 119 of file qwasmbackingstore.cpp.

◆ getUpdatedWebImage()

emscripten::val QWasmBackingStore::getUpdatedWebImage ( QWasmWindow * window )

Definition at line 124 of file qwasmbackingstore.cpp.

References updateTexture(), and QPlatformBackingStore::window().

Referenced by QWasmWindow::paint().

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◆ paintDevice()

QPaintDevice * QWasmBackingStore::paintDevice ( )

overridevirtual

Implement this function to return the appropriate paint device.

Implements QPlatformBackingStore.

Definition at line 34 of file qwasmbackingstore.cpp.

◆ resize()

void QWasmBackingStore::resize	(	const QSize &	size,
		const QRegion &	staticContents )

overridevirtual

Implements QPlatformBackingStore.

Definition at line 102 of file qwasmbackingstore.cpp.

References QPlatformWindow::devicePixelRatio(), QImage::Format_RGBA8888, Q_UNUSED, QImage::setDevicePixelRatio(), and QPlatformBackingStore::window().

Referenced by beginPaint().

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◆ toImage()

QImage QWasmBackingStore::toImage ( ) const

overridevirtual

Implemented in subclasses to return the content of the backingstore as a QImage.

If composition via a 3D graphics API is supported, either this function or toTexture() must be implemented.

The returned image is only valid until the next operation (resize, paint, scroll, or flush) on the backingstore. The caller must not store the return value between calls, but instead call this function before each use, or make an explicit copy.