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Autodocs
 Libraries:
 layers.library
  BeginUpdate
  BehindLayer
  CreateBehindHookLayer
  CreateBehindLayer
  CreateUpfrontHookLayer
  CreateUpfrontLayer
  DeleteLayer
  DisposeLayerInfo
  DoHookClipRects
  EndUpdate
  FattenLayerInfo
  InitLayers
  InstallClipRegion
  InstallLayerHook
  InstallLayerInfoHook
  LockLayer
  LockLayerInfo
  LockLayers
  MoveLayer
  MoveLayerInFrontOf
  MoveSizeLayer
  NewLayerInfo
  ScrollLayer
  SizeLayer
  SwapBitsRastPortClipRect
  ThinLayerInfo
  UnlockLayer
  UnlockLayerInfo
  UnlockLayers
  UpfrontLayer
  WhichLayer
Include
GuruMeditation
Docs » Autodocs » layers.library » SwapBitsRastPortClipRect

NAME

	SwapBitsRastPortClipRect -- Swap bits between common bitmap
and obscured ClipRect

SYNOPSIS

	SwapBitsRastPortClipRect( rp, cr )
a0 a1
void SwapBitsRastPortClipRect( struct RastPort *, struct ClipRect *);

FUNCTION

	Support routine useful for those that need to do some
operations not done by the layer library. Allows programmer
to swap the contents of a small BitMap with a subsection of
the display. This is accomplished without using extra memory.
The bits in the display RastPort are exchanged with the
bits in the ClipRect's BitMap.
Note: the ClipRect structures which the layer library allocates are
actually a little bigger than those described in the graphics/clip.h
include file. So be warned that it is not a good idea to have
instances of cliprects in your code.

INPUTS

	rp - pointer to rastport
cr - pointer to cliprect to swap bits with

NOTES

	Because the blit operation started by this function is done asynchronously,
it is imperative that a WaitBlit() be performed before releasing or using
the processor to modify any of the associated structures.

BUGS

SEE ALSO

<graphics/clip.h>, <graphics/rastport.h>, <graphics/clip.h>

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