ui/src/vbt/Batch.i3

 Copyright (C) 1992, Digital Equipment Corporation                         
 All rights reserved.                                                      
 See the file COPYRIGHT for a full description.                            
                                                                           
 Batch.def, by msm & cgn, Wed May  6 16:57:44 1987 
 Last modified on Tue Mar 10 18:58:41 1992 by steveg  
      modified on Mon Feb 24 13:56:33 PST 1992 by muller  
      modified on Wed Aug 28 17:51:59 PDT 1991 by gnelson 


      modified on Fri Mar  3 20:53:46 PST 1989 by msm 

<*PRAGMA LL*>

 A Batch.T is a data structure containing a sequence of
   VBT painting commands.  Batches are untraced: they must be
   explicitly allocated and freed using the procedures in
   this interface.  


INTERFACE Batch;

TYPE T <: ADDRESS;

PROCEDURE New(len: INTEGER := -1): T;

 Allocate a batch containing at least len Word.Ts. 
 If len = -1, the number of Word.Ts in the result will be
   VBTTuning.BatchSize.  Initially the clip and scroll source are
   Rect.Empty.  


PROCEDURE Free(VAR ba: T);

 Return ba to the free list and set ba := NIL.  
 Free(ba) is a checked runtime error if ba is NIL. 


END Batch.