Pixels can only be accessed through QPainter functions or by converting the QPixmap to a QImage. Because QPixmap is a QPaintDevice subclass, QPainter can be used to draw directly onto pixmaps. Note that the pixel data in a pixmap is internal and is managed by the underlying window system. For more information, see the Implicit Data Sharing documentation. QPixmap objects can be passed around by value since the QPixmap class uses implicit data sharing. QLabel has a pixmap property, whereas QAbstractButton has an icon property.
Finally, the QPicture class is a paint device that records and replays QPainter commands.Ī QPixmap can easily be displayed on the screen using QLabel or one of QAbstractButton ‘s subclasses (such as QPushButton and QToolButton ). The isQBitmap() function returns true if a QPixmap object is really a bitmap, otherwise returns false. QBitmap is only a convenience class that inherits QPixmap, ensuring a depth of 1. QImage is designed and optimized for I/O, and for direct pixel access and manipulation, while QPixmap is designed and optimized for showing images on screen. Qt provides four classes for handling image data: QImage, QPixmap, QBitmap and QPicture. Def convertFromImage (img)ĭef createHeuristicMask ()ĭef createMaskFromColor (maskColor)ĭef load (fileName])ĭef loadFromData (buf])ĭef loadFromData (data])ĭef save (device])ĭef save (fileName])ĭef scaled (s])ĭef scaled (w, h])ĭef scaledToHeight (h)ĭef scaledToWidth (w)ĭef scroll (dx, dy, rect)ĭef scroll (dx, dy, x, y, width, height)ĭef transformed (arg_1)
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