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# Adding an Accelerated Graphics Driver

Qtopia Core uses Qt's premade raster-based implementation of QPaintEngine (`QRasterPaintEngine`) to implement painting operations. In addition QScreen implements window composition. Both are complete software implementations.

Painting is performed in two steps: each window is rendered into a backingstore using QPaintEngine, and then the server composes the backingstore images and copies them to the screen. Composition is done by the QScreen::exposeRegion() function which again calls the more basic functions QScreen::blit() and QScreen::solidFill().

In order to make use of accelerated graphics hardware, it is possible to derive from QPaintEngine and QScreen.

The acceleration API is still work in progress, and details are subject to change.

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