This class is under development and is subject to change.
|QCustomRasterPaintDevice(QWidget * widget)|
|virtual int||bytesPerLine() const|
|virtual QImage::Format||format() const|
|virtual void *||memory() const|
Reimplemented Public Functions
|virtual int||metric(PaintDeviceMetric m) const|
- 12 public functions inherited from QPaintDevice
Additional Inherited Members
- 1 protected function inherited from QPaintDevice
The QCustomRasterPaintDevice class is provided to activate hardware accelerated paint engines in Qt for Embedded Linux.
Note that this class is only available in Qt for Embedded Linux.
In Qt for Embedded Linux, painting is a pure software implementation. But starting with Qt 4.2, it is possible to add an accelerated graphics driver to take advantage of available hardware resources.
Hardware acceleration is accomplished by creating a custom screen driver, accelerating the copying from memory to the screen, and implementing a custom paint engine accelerating the various painting operations. Then a custom paint device (derived from the QCustomRasterPaintDevice class) and a custom window surface (derived from QWSWindowSurface) must be implemented to make Qt for Embedded Linux aware of the accelerated driver.
See the Adding an Accelerated Graphics Driver to Qt for Embedded Linux documentation for details.
Member Function Documentation
QCustomRasterPaintDevice::QCustomRasterPaintDevice(QWidget * widget)
Constructs a custom raster based paint device for the given top-level widget.
Returns the number of bytes per line in the framebuffer. Note that this number might be larger than the framebuffer width.
[virtual] QImage::Format QCustomRasterPaintDevice::format() const
Returns the format of the device's memory buffet.
Returns a pointer to the paint device's memory buffer, or 0 if no such buffer exists.
[virtual] int QCustomRasterPaintDevice::metric(PaintDeviceMetric m) const
Reimplemented from QPaintDevice::metric().
© 2016 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.