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[править] QCustomRasterPaintDevice Class Reference
[модуль QtGui ]

The QCustomRasterPaintDevice class is provided to activate hardware accelerated paint engines in Qtopia Core. Далее...

 #include <QCustomRasterPaintDevice>

This class is under development and is subject to change.

Inherits QPaintDevice.

Класс был добавлен в Qt 4.2.

[править] Открытые функции

  • 12 открытых функций, унаследованных от QPaintDevice

[править] Дополнительные унаследованные члены

  • 1 защищенная функция, унаследованных от QPaintDevice

[править] Подробное описание

The QCustomRasterPaintDevice class is provided to activate hardware accelerated paint engines in Qtopia Core.

Note that this class is only available in Qtopia Core.

In Qtopia Core, painting is a pure software implementation. But starting with Qtopia Core 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 Qtopia Core aware of the accelerated driver.

See the Adding an Accelerated Graphics Driver in Qtopia Core documentation for details.

See also QRasterPaintEngine and QPaintDevice.

[править] Описание функций-членов

QCustomRasterPaintDevice::QCustomRasterPaintDevice ( QWidget * widget )

Constructs a custom raster based paint device for the given top-level widget.

int QCustomRasterPaintDevice::bytesPerLine () const [virtual]

Returns the number of bytes per line in the framebuffer. Note that this number might be larger than the framebuffer width.

QImage::Format QCustomRasterPaintDevice::format () const [virtual]

Returns the format of the device's memory buffet.

The default format is QImage::Format_ARGB32_Premultiplied. The only other valid format is QImage::Format_RGB16.

void * QCustomRasterPaintDevice::memory () const [virtual]

Returns a pointer to the paint device's memory buffer, or 0 if no such buffer exists.

Copyright © 2007 Trolltech Trademarks
Qt 4.3.2