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