gs_typ32.ps

GhostScript的源代码

%    Copyright (C) 1997 Aladdin Enterprises.  All rights reserved.
% 
% This file is part of Aladdin Ghostscript.
% 
% Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author
% or distributor accepts any responsibility for the consequences of using it,
% or for whether it serves any particular purpose or works at all, unless he
% or she says so in writing.  Refer to the Aladdin Ghostscript Free Public
% License (the "License") for full details.
% 
% Every copy of Aladdin Ghostscript must include a copy of the License,
% normally in a plain ASCII text file named PUBLIC.  The License grants you
% the right to copy, modify and redistribute Aladdin Ghostscript, but only
% under certain conditions described in the License.  Among other things, the
% License requires that the copyright notice and this notice be preserved on
% all copies.

% $Id: gs_typ32.ps $
% Initialization file for Type 32 fonts.

% ------ Type 32 fonts ------ %

% We need LanguageLevel 2 or higher in order to have defineresource.
languagelevel dup 2 max .setlanguagelevel

/BitmapFontInit mark

/.makeglyph32 systemdict /.makeglyph32 get
systemdict /.makeglyph32 .undef

/addglyph {	% ([wx wy llx lly urx ury] |
		%     [w0x w0y llx lly urx ury w1x w1y vx vy])
		%   <bitmap> <cid> <type32font> addglyph -
  1 index dup 2 index .removeglyphs
  22 string .makeglyph32
		% Stack: metrics bitmap cid font metstr
  3 index () ne {
		% Use G4 encoding to compress the bitmap.
		% Define a string large enough to hold the metrics,
		% an uncompressed bitmap (worst case = 5x expansion),
		% and the 2 RTC codes (3 bytes).
    dup length 4 index length 5 mul add 10 add string
		% Stack: metrics bitmap cid font metstr buffer
    dup 0 3 index putinterval
    dup 2 index length 1 index length 1 index sub getinterval
		% Stack: metrics bitmap cid font metstr buffer bitbuf
    mark /Columns 8 index dup 4 get exch 2 get sub
      /Rows 10 index dup 5 get exch 3 get sub
      /K -1 /EndOfBlock true /BlackIs1 true
    .dicttomark /CCITTFaxEncode filter
		% Stack: metrics bitmap cid font metstr buffer filter
    dup 6 index writestring closefile
		% Find the end of the data by scanning backwards for the RTC.
		% There are 2 RTCs x 12 bits = 3 bytes to remove.
    {
      dup dup length 1 sub get 0 ne { exit } if
      0 1 index length 1 sub getinterval
    } loop
    0 1 index length 3 sub getinterval
    exch pop	% metstr
  } if
  1 index /CharStrings get 3 index 3 -1 roll put
  pop pop pop pop
} obind

/removeall {		% <type32font> removeall -
  0 65535 2 index removeglyphs pop
} obind

/.removeglyphs systemdict /.removeglyphs get
systemdict /.removeglyphs .undef

/removeglyphs {		% <cid_min> <cid_max> <type32font> .removeglyphs -
  3 copy .removeglyphs
  dup /CharStrings get dup {
		% Stack: cidmin cidmax font CharStrings cid bitmap
    pop dup 5 index ge { dup 4 index le { 2 copy undef } if } if pop
  } forall pop pop pop pop
} obind

.dicttomark /ProcSet defineresource pop

/.cidfonttypes where { pop } { /.cidfonttypes 6 dict def } ifelse
.cidfonttypes begin

4	% CIDFontType 4 = FontType 32
{ dup /FontType 32 put
  dup /CharStrings 20 dict put
  1 index exch .buildfont32 exch pop
} bind def

end		% .cidfonttypes

% Define the BuildGlyph procedure.
% Since Type 32 fonts are indexed by CID, there is no BuildChar procedure.
% The name %Type32BuildGlyph is known to the interpreter.
(%Type32BuildGlyph) cvn {	% <font> <cid> %Type32BuildGlyph -
  1 index /CharStrings get
		% Stack: font cid CharStrings
  dup 2 index .knownget { exch pop } { 0 get } ifelse
		% Stack: font cid cstr
  dup .getmetrics32
 dup 14 gt {
    11 1 roll setcachedevice2
  } {
    7 1 roll setcachedevice
  } ifelse
		% Stack: font cid cstr w h nmetrics
  4 -1 roll exch 1 index length 1 index sub getinterval
		% Stack: font cid w h bitstr
  dup () eq {
    pop
  } {
    mark /Columns 4 index /Rows 5 index /K -1 /EndOfBlock false /BlackIs1 true
    .dicttomark /CCITTFaxDecode filter 2 index 2 index true
		% Stack: font cid w h filter w h true
    [ 1 0 0 1 0 7 index ] 5 -1 roll imagemask
  } ifelse
  pop pop pop pop
} bind def

systemdict /.getmetrics32 .undef

buildfontdict 32 /.buildfont32 cvx put

32 dup /FontType defineresource pop

.setlanguagelevel