\inmodule QtGui More...

#include <qbitmap.h>

Inheritance diagram for QBitmap:

Collaboration diagram for QBitmap:

Public Types
typedef QExplicitlySharedDataPointer< QPlatformPixmap >	DataPtr

Public Types inherited from QPixmap
typedef QExplicitlySharedDataPointer< QPlatformPixmap >	DataPtr

Public Types inherited from QPaintDevice
enum	PaintDeviceMetric { PdmWidth = 1 , PdmHeight , PdmWidthMM , PdmHeightMM , PdmNumColors , PdmDepth , PdmDpiX , PdmDpiY , PdmPhysicalDpiX , PdmPhysicalDpiY , PdmDevicePixelRatio , PdmDevicePixelRatioScaled }

Public Member Functions
	QBitmap ()
	Constructs a null bitmap.

	QBitmap (int w, int h)
	Constructs a bitmap with the given width and height.

	QBitmap (const QSize &)

	QBitmap (const QString &fileName, const char *format=nullptr)
	Constructs a bitmap from the file specified by the given fileName.

	~QBitmap () override

void	swap (QBitmap &other)

	operator QVariant () const
	Returns the bitmap as a QVariant.

void	clear ()
	Clears the bitmap, setting all its bits to Qt::color0.

QBitmap	transformed (const QTransform &matrix) const
	Returns a copy of this bitmap, transformed according to the given matrix.

Public Member Functions inherited from QPixmap
	QPixmap ()
	Constructs a null pixmap.

	QPixmap (QPlatformPixmap *data)

	QPixmap (int w, int h)
	Constructs a pixmap with the given width and height.

	QPixmap (const QSize &)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Constructs a pixmap of the given size.

	QPixmap (const QString &fileName, const char *format=nullptr, Qt::ImageConversionFlags flags=Qt::AutoColor)
	Constructs a pixmap from the file with the given fileName.

	QPixmap (const char *const xpm[])
	Constructs a pixmap from the given xpm data, which must be a valid XPM image.

	QPixmap (const QPixmap &)
	Constructs a pixmap that is a copy of the given pixmap.

	QPixmap (QPixmap &&other) noexcept
	Move-constructs a QPixmap instance from other.

	~QPixmap ()
	Destroys the pixmap.

QPixmap &	operator= (const QPixmap &)
	Assigns the given pixmap to this pixmap and returns a reference to this pixmap.

void	swap (QPixmap &other) noexcept

bool	operator== (const QPixmap &) const =delete

bool	operator!= (const QPixmap &) const =delete

	operator QVariant () const
	Returns the pixmap as a QVariant.

bool	isNull () const
	Returns `true` if this is a null pixmap; otherwise returns `false`.

int	devType () const override

int	width () const
	Returns the width of the pixmap.

int	height () const
	Returns the height of the pixmap.

QSize	size () const
	Returns the size of the pixmap.

QRect	rect () const
	Returns the pixmap's enclosing rectangle.

int	depth () const
	Returns the depth of the pixmap.

void	fill (const QColor &fillColor=Qt::white)
	Fills the pixmap with the given color.

QBitmap	mask () const
	Returns `true` if this pixmap has an alpha channel, or has a mask, otherwise returns `false`.

void	setMask (const QBitmap &)
	Sets a mask bitmap.

qreal	devicePixelRatio () const
	Returns the device pixel ratio for the pixmap.

void	setDevicePixelRatio (qreal scaleFactor)
	Sets the device pixel ratio for the pixmap.

QSizeF	deviceIndependentSize () const
	Returns the size of the pixmap in device independent pixels.

bool	hasAlpha () const

bool	hasAlphaChannel () const

QBitmap	createHeuristicMask (bool clipTight=true) const
	Creates and returns a heuristic mask for this pixmap.

QBitmap	createMaskFromColor (const QColor &maskColor, Qt::MaskMode mode=Qt::MaskInColor) const
	Creates and returns a mask for this pixmap based on the given maskColor.

QPixmap	scaled (int w, int h, Qt::AspectRatioMode aspectMode=Qt::IgnoreAspectRatio, Qt::TransformationMode mode=Qt::FastTransformation) const

QPixmap	scaled (const QSize &s, Qt::AspectRatioMode aspectMode=Qt::IgnoreAspectRatio, Qt::TransformationMode mode=Qt::FastTransformation) const

QPixmap	scaledToWidth (int w, Qt::TransformationMode mode=Qt::FastTransformation) const
	Returns a scaled copy of the image.

QPixmap	scaledToHeight (int h, Qt::TransformationMode mode=Qt::FastTransformation) const
	Returns a scaled copy of the image.

QPixmap	transformed (const QTransform &, Qt::TransformationMode mode=Qt::FastTransformation) const

QImage	toImage () const
	Converts the pixmap to a QImage.

bool	load (const QString &fileName, const char *format=nullptr, Qt::ImageConversionFlags flags=Qt::AutoColor)
	Loads a pixmap from the file with the given fileName.

bool	loadFromData (const uchar buf, uint len, const char format=nullptr, Qt::ImageConversionFlags flags=Qt::AutoColor)
	Loads a pixmap from the len first bytes of the given binary data.

bool	loadFromData (const QByteArray &data, const char *format=nullptr, Qt::ImageConversionFlags flags=Qt::AutoColor)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Loads a pixmap from the binary data using the specified format and conversion flags.

bool	save (const QString &fileName, const char *format=nullptr, int quality=-1) const
	Saves the pixmap to the file with the given fileName using the specified image file format and quality factor.

bool	save (QIODevice device, const char format=nullptr, int quality=-1) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This function writes a QPixmap to the given device using the specified image file format and quality factor.

bool	convertFromImage (const QImage &img, Qt::ImageConversionFlags flags=Qt::AutoColor)
	Replaces this pixmap's data with the given image using the specified flags to control the conversion.

QPixmap	copy (int x, int y, int width, int height) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Returns a deep copy of the subset of the pixmap that is specified by the rectangle QRect( x, y, width, height).

QPixmap	copy (const QRect &rect=QRect()) const
	Returns a deep copy of the subset of the pixmap that is specified by the given rectangle.

void	scroll (int dx, int dy, int x, int y, int width, int height, QRegion *exposed=nullptr)

void	scroll (int dx, int dy, const QRect &rect, QRegion *exposed=nullptr)

qint64	cacheKey () const
	Returns a number that identifies this QPixmap.

bool	isDetached () const

void	detach ()
	Detaches the pixmap from shared pixmap data.

bool	isQBitmap () const
	Returns `true` if this is a QBitmap; otherwise returns `false`.

QPaintEngine *	paintEngine () const override

bool	operator! () const
	Returns `true` if this is a null pixmap; otherwise returns `false`.

QPlatformPixmap *	handle () const

DataPtr &	data_ptr ()

Public Member Functions inherited from QPaintDevice
virtual	~QPaintDevice ()

bool	paintingActive () const

int	width () const

int	height () const

int	widthMM () const

int	heightMM () const

int	logicalDpiX () const

int	logicalDpiY () const

int	physicalDpiX () const

int	physicalDpiY () const

qreal	devicePixelRatio () const

qreal	devicePixelRatioF () const

int	colorCount () const

int	depth () const

Static Public Member Functions
static QBitmap	fromImage (const QImage &image, Qt::ImageConversionFlags flags=Qt::AutoColor)
	Returns a copy of the given image converted to a bitmap using the specified image conversion flags.

static QBitmap	fromImage (QImage &&image, Qt::ImageConversionFlags flags=Qt::AutoColor)

static QBitmap	fromData (const QSize &size, const uchar *bits, QImage::Format monoFormat=QImage::Format_MonoLSB)
	Constructs a bitmap with the given size, and sets the contents to the bits supplied.

static QBitmap	fromPixmap (const QPixmap &pixmap)
	Returns a copy of the given pixmap converted to a bitmap.

Static Public Member Functions inherited from QPixmap
static int	defaultDepth ()

static QTransform	trueMatrix (const QTransform &m, int w, int h)
	Returns the actual matrix used for transforming a pixmap with the given width, height and matrix.

static QPixmap	fromImage (const QImage &image, Qt::ImageConversionFlags flags=Qt::AutoColor)
	Converts the given image to a pixmap using the specified flags to control the conversion.

static QPixmap	fromImageReader (QImageReader *imageReader, Qt::ImageConversionFlags flags=Qt::AutoColor)
	Create a QPixmap from an image read directly from an imageReader.

static QPixmap	fromImage (QImage &&image, Qt::ImageConversionFlags flags=Qt::AutoColor)

Static Public Member Functions inherited from QPaintDevice
static qreal	devicePixelRatioFScale ()

Additional Inherited Members
Protected Member Functions inherited from QPixmap
int	metric (PaintDeviceMetric) const override

Protected Member Functions inherited from QPaintDevice
	QPaintDevice () noexcept

virtual void	initPainter (QPainter *painter) const

virtual QPaintDevice *	redirected (QPoint *offset) const

virtual QPainter *	sharedPainter () const

Static Protected Member Functions inherited from QPixmap
static QPixmap	fromImageInPlace (QImage &image, Qt::ImageConversionFlags flags=Qt::AutoColor)

Protected Attributes inherited from QPaintDevice
ushort	painters

Related Symbols inherited from QPixmap
QDataStream &	operator<< (QDataStream &stream, const QPixmap &pixmap)
	Writes the given pixmap to the given stream as a PNG image.

QDataStream &	operator>> (QDataStream &stream, QPixmap &pixmap)
	Reads an image from the given stream into the given pixmap.

Detailed Description

\inmodule QtGui

The QBitmap class provides monochrome (1-bit depth) pixmaps.

The QBitmap class is a monochrome off-screen paint device used mainly for creating custom QCursor and QBrush objects, constructing QRegion objects, and for setting masks for pixmaps and widgets.

QBitmap is a QPixmap subclass ensuring a depth of 1, except for null objects which have a depth of 0. If a pixmap with a depth greater than 1 is assigned to a bitmap, the bitmap will be dithered automatically.

Use the QColor objects Qt::color0 and Qt::color1 when drawing on a QBitmap object (or a QPixmap object with depth 1).

Painting with Qt::color0 sets the bitmap bits to 0, and painting with Qt::color1 sets the bits to 1. For a bitmap, 0-bits indicate background (or transparent pixels) and 1-bits indicate foreground (or opaque pixels). Use the clear() function to set all the bits to Qt::color0. Note that using the Qt::black and Qt::white colors make no sense because the QColor::pixel() value is not necessarily 0 for black and 1 for white.

The QBitmap class provides the transformed() function returning a transformed copy of the bitmap; use the QTransform argument to translate, scale, shear, and rotate the bitmap. In addition, QBitmap provides the static fromData() function which returns a bitmap constructed from the given uchar data, and the static fromImage() function returning a converted copy of a QImage object.

Just like the QPixmap class, QBitmap is optimized by the use of implicit data sharing. For more information, see the \l {Implicit Data Sharing} documentation.

See also: QPixmap, QImage, QImageReader, QImageWriter

Definition at line 15 of file qbitmap.h.

Member Typedef Documentation

◆ DataPtr

QBitmap::DataPtr

Definition at line 43 of file qbitmap.h.

Constructor & Destructor Documentation

◆ QBitmap() [1/4]

QBitmap::QBitmap ( )

Constructs a null bitmap.

See also: QPixmap::isNull()

Definition at line 70 of file qbitmap.cpp.

Referenced by fromImage(), fromImage(), and fromPixmap().

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◆ QBitmap() [2/4]

QBitmap::QBitmap	(	int	width,
		int	height )

Constructs a bitmap with the given width and height.

The pixels inside are uninitialized.

See also: clear()

Definition at line 83 of file qbitmap.cpp.

◆ QBitmap() [3/4]

QBitmap::QBitmap ( const QSize & size )

explicit

Deprecated: [6.0] Use fromPixmap instead.

Constructs a bitmap with the given size. The pixels in the bitmap are uninitialized.

See also: clear()

Definition at line 96 of file qbitmap.cpp.

◆ QBitmap() [4/4]

QBitmap::QBitmap	(	const QString &	fileName,
		const char *	format = nullptr )

explicit

Constructs a bitmap from the file specified by the given fileName.

If the file does not exist, or has an unknown format, the bitmap becomes a null bitmap.

The fileName and format parameters are passed on to the QPixmap::load() function. If the file format uses more than 1 bit per pixel, the resulting bitmap will be dithered automatically.

See also: QPixmap::isNull(), QImageReader::imageFormat()

Definition at line 124 of file qbitmap.cpp.

References fileName, QPixmap::load(), and Qt::MonoOnly.

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◆ ~QBitmap()

QBitmap::~QBitmap ( )

overridedefault

This dtor must stay empty until Qt 7 (was inline until 6.2).

Member Function Documentation

◆ clear()

QBitmap::clear ( )

inline

Clears the bitmap, setting all its bits to Qt::color0.

Definition at line 33 of file qbitmap.h.

References Qt::color0, and fill().

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◆ fromData()

QBitmap QBitmap::fromData	(	const QSize &	size,
		const uchar *	bits,
		QImage::Format	monoFormat = QImage::Format_MonoLSB )

static

Constructs a bitmap with the given size, and sets the contents to the bits supplied.

The bitmap data has to be byte aligned and provided in the bit order specified by monoFormat. The mono format must be either QImage::Format_Mono or QImage::Format_MonoLSB. Use QImage::Format_Mono to specify data on the XBM format.

See also: fromImage()

Definition at line 207 of file qbitmap.cpp.

References Qt::color0, Qt::color1, QImage::Format_Mono, QImage::Format_MonoLSB, fromImage(), Q_ASSERT, and rgb.

Referenced by createPixmapCursorFromData(), qHasPixmapTexture(), QSvgPaintEngine::savePatternMask(), and QX11PlatformPixmap::transformed().

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◆ fromImage() [1/2]

QBitmap QBitmap::fromImage	(	const QImage &	image,
		Qt::ImageConversionFlags	flags = Qt::AutoColor )

static

Returns a copy of the given image converted to a bitmap using the specified image conversion flags.

See also: fromData()

Definition at line 170 of file qbitmap.cpp.

References QBitmap(), QImage::Format_MonoLSB, and makeBitmap().

Referenced by QCursor::QCursor(), QPixmap::QPixmap(), QGraphicsItem::boundingRegion(), QPixmap::createHeuristicMask(), QPixmap::createMaskFromColor(), fromData(), QX11PlatformPixmap::fromImage(), fromPixmap(), QPlatformPixmap::mask(), QX11PlatformPixmap::mask(), qt_patternForAlpha(), QMacStyle::styleHint(), and QQC2_NAMESPACE::QMacStyle::styleHint().

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◆ fromImage() [2/2]

QBitmap QBitmap::fromImage	(	QImage &&	image,
		Qt::ImageConversionFlags	flags = Qt::AutoColor )

static

Since: 5.12 This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Returns a copy of the given image converted to a bitmap using the specified image conversion flags.