class QBitmap

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

Inheritance diagram of PySide6.QtGui.QBitmap

Synopsis

Methods

Static functions

Note

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Detailed Description

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 Implicit Data Sharing documentation.

__init__()

Constructs a null bitmap.

See also

isNull()

__init__(arg__1)
Parameters:

arg__1 – QPixmap

Note

This function is deprecated.

Use fromPixmap instead. Constructs a bitmap that is a copy of the given pixmap.

If the pixmap has a depth greater than 1, the resulting bitmap will be dithered automatically.

See also

depth() fromImage() fromData()

__init__(arg__1)
Parameters:

arg__1 – QSize

Use fromPixmap instead.

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

See also

clear()

__init__(fileName[, format=None])
Parameters:

  • fileName – str

  • format – str

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 load() function. If the file format uses more than 1 bit per pixel, the resulting bitmap will be dithered automatically.

__init__(w, h)
Parameters:

  • w – int

  • h – int

Constructs a bitmap with the given width and height. The pixels inside are uninitialized.

See also

clear()

clear()

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

static fromData(size, bits[, monoFormat=QImage.Format_MonoLSB])
Parameters:
Return type:

QBitmap

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 Format_Mono or Format_MonoLSB . Use Format_Mono to specify data on the XBM format.

See also

fromImage()

static fromPixmap(pixmap)
Parameters:

pixmap – QPixmap

Return type:

QBitmap

Returns a copy of the given pixmap converted to a bitmap.

If the pixmap has a depth greater than 1, the resulting bitmap will be dithered automatically.

See also

depth()

swap(other)
Parameters:

other – QBitmap

Swaps bitmap other with this bitmap. This operation is very fast and never fails.

transformed(matrix)
Parameters:

matrix – QTransform

Return type:

QBitmap

Returns a copy of this bitmap, transformed according to the given matrix.

See also

transformed()