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NAME
- ChangeVPBitMap
-
change display memory address for multi-buffered animation (V39)
SYNOPSIS
ChangeVPBitMap(vp,bm,db)
void ChangeVPBitMap(struct ViewPort *, struct BitMap *, struct DBufInfo *);
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FUNCTION
Changes the area of display memory which will be displayed in a viewport. This can be used to implement double (or triple) buffering, a method of achieving smooth animation.
INPUTS
vp = a pointer to a viewport
bm = a pointer to a BitMap structure. This BitMap structure must be
bm = a pointer to a BitMap structure. This BitMap structure must be
of the same layout as the one attached to the viewport (same depth, alignment, and BytesPerRow).
db = A pointer to a DBufInfo.
NOTES
This will set the vp->RasInfo->BitMap field to the bm pointer which is passed.
When using the synchronization features, you MUST carefully insure that all messages have been replied to before calling FreeDBufInfo or calling ChangeVPBitMap with the same DBufInfo.
When using the synchronization features, you MUST carefully insure that all messages have been replied to before calling FreeDBufInfo or calling ChangeVPBitMap with the same DBufInfo.