QImage also provides the static fromData() function, constructing a QImage from the given data. Reading and Writing Image Files QImage provides several ways of loading an image file: The file can be loaded when constructing the QImage object, or by using the load() or loadFromData() functions later on. Note: If you would like to load QImage objects in a static build of Qt, refer to the Plugin HowTo. QImage objects can also be streamed and compared. QImage objects can be passed around by value since the QImage class uses implicit data sharing. There are also several functions that enables transformation of the image. QImage provides a collection of functions that can be used to obtain a variety of information about the image. These include monochrome, 8-bit, 32-bit and alpha-blended images which are available in all versions of Qt 4.x. The QImage class supports several image formats described by the Format enum. When using QPainter on a QImage, the painting can be performed in another thread than the current GUI thread. Finally, the QPicture class is a paint device that records and replays QPainter commands.īecause QImage is a QPaintDevice subclass, QPainter can be used to draw directly onto images. 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. The QImage class provides a hardware-independent image representation that allows direct access to the pixel data, and can be used as a paint device. Public class QImage extends QtJambiObject implements QPaintDeviceInterface, SUMMARY: NESTED | FIELD | CONSTR | METHODĬom.trolltech.qt.internal.QSignalEmitterInternalĬom.trolltech.qt.QSignalEmitter .QtJambiObject .gui.QImage All Implemented Interfaces: QPaintDeviceInterface, QtJambiInterface,
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