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GetVideoParameters (csCode = 18)

The required GetVideoParameters routine returns video parameter information.



 
OSErr = Status (theDeviceRefNum, cscGetVideoParameters, 

                     &theVDVideoParametersRec);

--> csDisplayModeID: ID of the desired DisplayModeID
--> csDepthMode: Relative bit depth
<-> *csVPBlockPtr: Pointer to a VPBlock
<-- csPageCount: Number of pages supported for resolution and relative bit depth
<-- csDeviceType: Direct, fixed, or CLUT

The GetVideoParameters routine accepts csDisplayModeID, csDepthMode, and a pointer to a VPBlock structure, which it fills in with the data for the specified csDisplayModeID and csDepthMode. It also returns the pageCount for that particular bit depth, as well as the deviceType.

Note

In PCI-based graphics drivers, the csVPBlockPtr->vpBaseOffset is always 0. The base address of video RAM for the current page, is the BaseAddress value returned by the GetCurrentMode routine.