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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 » BeginUpdate

NAME

	BeginUpdate -- Prepare to repair damaged layer.

SYNOPSIS

	result = BeginUpdate( l )
	d0                    a0
	LONG BeginUpdate( struct Layer *);

FUNCTION

	Convert damage list to ClipRect list and swap in for
	programmer to redraw through. This routine simulates
	the ROM library environment. The idea is to only render in the
	"damaged" areas, saving time over redrawing all of the layer.
	The layer is locked against changes made by the layer library.

INPUTS

	l - pointer to a layer

RESULT

	result - TRUE if damage list converted to ClipRect list successfully.
	         FALSE if list conversion aborted. (probably out of memory)

BUGS

	If BeginUpdate returns FALSE, programmer must abort the attempt to
	refresh this layer and instead call EndUpdate( l, FALSE ) to restore
	original ClipRect and damage list.

SEE ALSO

EndUpdate(), <graphics/layers.h>, <graphics/clip.h>

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