typedef struct _DD_UPDATEOVERLAYDATA {
PDD_DIRECTDRAW_GLOBAL lpDD;
PDD_SURFACE_LOCAL lpDDDestSurface;
RECTL rDest;
PDD_SURFACE_LOCAL lpDDSrcSurface;
RECTL rSrc;
DWORD dwFlags;
DDOVERLAYFX overlayFX;
HRESULT ddRVal;
VOID * UpdateOverlay;
} DD_UPDATEOVERLAYDATA;
The DD_UPDATEOVERLAYDATA structure is passed to the DirectDraw hardware interface’s UpdateOverlay surface object callback.
Members
lpDD
Pointer to the DD_DIRECTDRAW_GLOBAL structure that describes the driver.
lpDDDestSurface
Pointer to the DD_SURFACE_LOCAL structure that describes the surface to be overlayed. This value can be NULL if DDOVER_HIDE is specified for dwFlags.
rDest
RECTL that specifies the destination for the overlay.
lpDDSrcSurface
Pointer to the DD_SURFACE_LOCAL structure that describes the overlay surface.
rSrc
RECTL that specifies the portion of the source surface to be used for the overlay.
dwFlags
Specifies how the driver should handle the overlay. This field can be a combination of the following values:
| Value | Meaning |
| DDOVER_HIDE | The driver should hide the overlay surface. |
| DDOVER_SHOW | The driver should show the overlay surface using the attributes specified by overlayFX. |
| DDOVER_KEYDEST | The driver should use the color key associated with the destination surface by SetColorKey. |
| DDOVER_KEYDESTOVERRIDE | The driver should use the destination color key specified by overlayFX.dckDestColorKey. |
| DDOVER_KEYSRC | The driver should use the color key associated with the destination surface by SetColorKey. |
| DDOVER_KEYSRCOVERRIDE | The driver should use the source color key specified by overlayFX.dckSrcColorKey. |
overlayFX
DDOVERLAYFX structure that contains the requested attributes for the overlay.
ddRVal
Location in which the driver returns a DirectDraw status return code. The status codes are defined in ddraw.h.
UpdateOverlay
Unused by Windows NT.