[Gs-code-review] Run PDF files under a level of 'save'

[L. Peter Deutsch]

Log entry:

    Makes the PDF interpreter run files under a level of 'save'.  This
    improves memory utilization significantly, although we don't understand
    why.

Index: lib/pdf_main.ps
===================================================================
RCS file: /cvs/ghostscript/gs/lib/pdf_main.ps,v
retrieving revision 1.44
diff -C2 -r1.44 pdf_main.ps
*** lib/pdf_main.ps	21 Feb 2002 21:49:28 -0000	1.44
--- lib/pdf_main.ps	22 Feb 2002 03:44:07 -0000
***************
*** 101,106 ****
  currentdict /runpdfstring .undef
  
! /runpdf			% <file> runpdf -
!  { userdict begin
     /Page# null def
     /Page null def
--- 101,111 ----
  currentdict /runpdfstring .undef
  
! /runpdf {		% <file> runpdf -
!    userdict begin
! 	% It turns out that the PDF interpreter uses memory more
! 	% effectively if it is run under at least one level of save.
! 	% This is counter-intuitive, and we don't understand why it happens,
! 	% but the improvement is significant.
!    /PDFTopSave save def
     /Page# null def
     /Page null def
***************
*** 141,146 ****
     end			% temporary dict
     end			% pdfdict
     end			% userdict
!  } bind def
  end			% systemdict
  % Redefine the procedure that the C code uses for running piped input.
--- 146,153 ----
     end			% temporary dict
     end			% pdfdict
+    end			% GS_PDF_ProcSet
+    PDFTopSave restore
     end			% userdict
! } bind def
  end			% systemdict
  % Redefine the procedure that the C code uses for running piped input.


-- 

L. Peter Deutsch     |    Aladdin Enterprises   |  203 Santa Margarita Ave.
ghost at aladdin.com    |  http://www.aladdin.com  |  Menlo Park, CA 94025

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