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Terminology for graphics driver writers

Cursor support

The NFB interface provides three levels of cursor mouse movement support.

For certain graphics architectures (fast system bus, limited off-screen memory), the graphics chip has no hardware cursor support and the graphics adapters using this chip could potentially have several different DACs that implement their hardware cursor differently. For these devices, it is wise to always make the full software cursor emulation (mentioned first above) available, for example by setting a flag in the grafinfo(DSP/4dsp) file on SVR5 and SCO OpenServer 5. This will avoid situations where a new graphics adapter comes out that uses chip A, but doesn't have DAC B, so the NFB driver that uses only the hardware cursor defined for DAC B breaks.
© 2005 The SCO Group, Inc. All rights reserved.
OpenServer 6 and UnixWare (SVR5) HDK - June 2005