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The DDHAL_GETSCANLINEDATAstructure returns the scan line. This structure passes the information to the DirectDraw HAL GetScanLinecallback function.
typedef struct _DDHAL_GETSCANLINEDATA {
LPDDRAWI_DIRECTDRAW_GBL
lpDD
;
DWORD
dwScanLine
;
HRESULT
ddRVal
;
LPDDHAL_GETSCANLINE
GetScanLine
;
} DDHAL_GETSCANLINEDATA;
Members
- lpDD
- Pointer to the DDRAWI_DIRECTDRAW_GBLstructure that represents the DirectDraw object.
- dwScanLine
- Indicates the number of the scan line.
- ddRVal
- Passes the DirectDraw return values.
- GetScanLine
- This member is used by DirectDraw and should not be filled in
by the driver.
Remarks
The returned scan line value in dwScanLinemust be between 0 and <n>, where scan line 0 is the first visible scan line on the screen and <n> is the last visible scan line, plus any scan lines that occur during vblank. For example, in a case where you're running at a screen resolution of 640x480, and you have 12 scan lines during vertical blank, the values returned to GetScanLinerange from 0 to 491.
Last updated on Tuesday, July 13, 2004