HP c8000 Workstation Guia do Utilizador descarregar pdf (Página 57)

configuring X Windows on HP-UX (other graphics cards)

extensions

Chapter 3 55

extensions

double buffer extension (DBE)

DBE is an extension to the X Server that provides a double-buffering

API. For more information about DBE and the API, consult the DBE

man pages:

DBE

XdbeQueryExtension

XdbeGetVisualInfo

XdbeFreeVisualInfo

XdbeScreenVisualInfo

XdbeAllocateBackBufferName

XdbeDeallocateBackBufferName

XdbeSwapBuffers

XdbeBeginIdiom

XdbeEndIdiom

XdbeGetBackBufferAttributes

determining swap performance

The DBE API does not allow users to determine if double-buffering in a

visual is through software or hardware. However, the API does provide a

way to determine relative swapping performance on a per-visual basis.

The XdbeScreenVisualInfo() function returns information about

the swapping performance levels for the double-buffering visuals on a

display. A visual with a higher performance level is likely to have better

double-buffer graphics performance than a visual with a lower

performance level. Nothing can be deduced from any of the following: the

magnitude of the difference of two performance levels, a performance

level in isolation, or comparing performance levels from different servers.

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HP c8000 Workstation Guia do Utilizador Página 57