HP j6700 hp workstations - hp-ux 11.x graphics administration guide - Page 57
extensions, double buffer extension DBE, determining swap performance
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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. Chapter 3 55