Docs » Autodocs » graphics.library » ChangeVPBitMap
ChangeVPBitMap -- change display memory address for multi-buffered
animation (V39)
ChangeVPBitMap(vp,bm,db)
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void ChangeVPBitMap(struct ViewPort *, struct BitMap *, struct DBufInfo *);
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.
vp = a pointer to a viewport
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.
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.
AllocDBufInfo(), AllocBitMap()
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