plan9fox/sys/lib/ghostscript/gs_fapi.ps

%    Copyright (C) 2000 artofcode LLC.  All rights reserved.
% 
% This software is provided AS-IS with no warranty, either express or
% implied.
% 
% This software is distributed under license and may not be copied,
% modified or distributed except as expressly authorized under the terms
% of the license contained in the file LICENSE in this distribution.
% 
% For more information about licensing, please refer to
% http://www.ghostscript.com/licensing/. For information on
% commercial licensing, go to http://www.artifex.com/licensing/ or
% contact Artifex Software, Inc., 101 Lucas Valley Road #110,
% San Rafael, CA  94903, U.S.A., +1(415)492-9861.

% $Id: gs_fapi.ps,v 1.25 2003/04/12 18:08:18 ray Exp $
% Redefine Font and CIDFont categories with FAPI-handeled fonts.

systemdict /.FAPIavailable known { .FAPIavailable } { false } ifelse not {
  (%END FAPI) .skipeof
} if

languagelevel 2 .setlanguagelevel

%====================================================================
% Redefine Font category with FAPIfontmap and CIDFont with FAPIfontmap :
15 dict begin    % a temporary dictionary for local binding.

/EmbedFontObjectsQuery mark
  /.EmbedFontObjects 0
.dicttomark def

/is_device_compatible_to_FAPI    % - is_device_compatible_to_FAPI <bool>
{ currentdevice //EmbedFontObjectsQuery .getdeviceparams               % <mark> <name> <value> ...
  dup mark eq {
    pop true
  } {
    exch pop exch pop 0 eq
  } ifelse
  % The code above assumes that only the requested parameter is rendered.
  % The commented-out code below may be useful for general case.
  % Keeping it for a while.
  % counttomark 2 idiv {
  %   exch /.EmbedFontObjects eq {
  %     counttomark 1 add 1 roll cleartomark
  %     0 eq exit
  %   } if
  % } repeat
  % dup mark eq {
  %   pop true
  % } if
} bind def

%----------------------------- Process FAPIconfig -----------------------

/Config
<<
%% Replace 1 (FAPIconfig)
  (FAPIconfig) .runlibfile
>> def

%------------------Copy the FontEmulationProcs here : -------------------

/FontEmulationProcs /ProcSet findresource {
  def
} forall

currentdict /super.complete_instance currentdict /complete_instance get put

%-----------FAPI-specific methods for category redefinition : -----------

/RefinePath      % <FontDict> /key RefinePath <FontDict>
{ exch begin
  //Config exch get
  /Path exch
  Path false .file_name_combine not {
    exch
    (Can't combine paths ) print print ( and ) print =
    /RefinePath /configurationerror signalerror
  } if
  def
  currentdict end
} bind def

/complete_instance  % <font_name> <FontDict> <Options> complete_FAPI_Font <font_name> <FontDict>
{ //super.complete_instance exec
  dup /CIDFontName known { /CIDFontPath } { /FontPath } ifelse //RefinePath exec
} bind def

/IsMyRecord      % <raw_record> -> <raw_record> bool
{ dup type /dicttype eq { dup /FAPI known } { false } ifelse
} bind def

/IsActive       % <record> IsActive <bool>
{ pop //is_device_compatible_to_FAPI exec
} bind def

/FontRecordVirtualMethods //RecordVirtualMethodsStub dup length 2 add dict copy begin
  /IsActive //IsActive def
  /MakeInstance   % <Name> <record> MakeInstance <Name> <Instance> <size>
  { //FontOptions //complete_instance exec
    2 copy //GetSize exec
  } bind def
currentdict end def

/CIDFontRecordVirtualMethods //RecordVirtualMethodsStub dup length 3 add dict copy begin
  /GetCSI //TranslateCSI def
  /IsActive //IsActive def
  /MakeInstance   % <Name> <record> MakeInstance <Name> <Instance> <size>
  { //CIDFontOptions //complete_instance exec
    2 copy //GetSize exec
  } bind def
currentdict end def

%----------------------------------The Redefintion---------------------

/MappedCategoryRedefiner /ProcSet findresource /Redefine get /Redefine exch def

% Redefine the /Font category :
4 dict begin
  /CategoryName /Font def
  /MapFileName (FAPIfontmap) def
  /VerifyMap  { pop } bind def
  /PreprocessRecord  % <map> <Name> <raw_record> PreprocessRecord <map> <Name> <record> <bool>
  { //IsMyRecord exec dup {
      pop dup /RecordVirtualMethods //FontRecordVirtualMethods put
      true
    } if
  } bind def
currentdict end Redefine

% Redefine the /CIDFont category :
4 dict begin
  /CategoryName /CIDFont def
  /MapFileName (FAPIcidfmap) def
  /VerifyMap  { pop } bind def
  /PreprocessRecord  % <map> <Name> <raw_record> PreprocessRecord <map> <Name> <record> <bool>
  { //IsMyRecord exec dup {
      pop dup /RecordVirtualMethods //CIDFontRecordVirtualMethods put
      true
    } if
  } bind def
currentdict end Redefine

%==================== A hook for buildfont* operators ====================

% The procedure .FAPIhook redirects PS fonts to FAPI on necessity.
% This depends on the following conditions :
%
% 1. If font dictionary has /FAPI entry, it is a font listed in FAPIconfig.FontPath,
%    and must be build with .FAPIrebuildfont, or a copy of a font, which was
%    built with .FAPIrebuildfont .
%
% 2. If the font dictionary has /PathLoad entry, and has no /FAPI entry,
%    it is an installed PS font, which is described in lib/fontmap or
%    in GS_FONTPATH. .loadfont inserts /PathLoad entry for this case
%    (see gs_fonts.ps).
%
%    Installed fonts are being loaded with GS font loader,
%    the they are passed to FAPI is same way as embedded fonts are.
%    We do so because UFST cannot read fonts, which don't
%    follow Type 1/42 file format strongly.
%
% 3. Executing .loadfont, we place /FAPI_hook_disable in the 0th
%    element of some procedure on the execution stack - see gs_fonts.ps .
%    If FAPI_hook finds /FAPI_hook_disable in there, 
%    it knows that it is called for a disk font during 
%    its internal definefont.
%
% 4. If font dictionary has no /FAPI entry, and has no /Path entry,
%    and if we are not in .loadfont context, it is an embedded font.
%
% 5. Two entries to be defined in lib/FAPIconfig to control the hooking of PS fonts :
%    HookDiskFonts and HookEmbeddedFonts .
%    They specify arrays of font types (integers) to be redirected with FAPI.
%    HookDiskFonts controls disk PS fonts (which fall into (2) and (3) ).
%    HookEmbeddedFonts controls fonts being embedded into documents.
%
% 7. We apply the operator .passtoFAPI for checking whether FAPI can handle a font. 
%    If so, we insert /FAPI entry into the font dictionary and convert it
%    with .FAPIrebuildfont . Otherwise the font is handled with the native GS font renderer.

/FAPI_hook_debug   % <proc> FAPI_hook_debug -
FAPIDEBUG { {exec} } { {pop} } ifelse
bind def
 
/FAPI_hook_warn   % <proc> FAPI_hook_debug -
QUIET { {pop} } { {exec} } ifelse
bind def
 
/FAPI_is_hook_disabled     % - FAPI_is_hook_disabled <bool>
{ % checks whether execution stack contains packedarray started with /FAPI_hook_disable .
  /FAPI_hook_disable /MappedCategoryRedefiner /ProcSet findresource /execstack_lookup get exec
  null ne
} bind def

/FAPIhook_aux  %      <string|name> <font_dict> .FAPIhook <string|name> <font>
{                                                     % name <<font>>
  { (FAPIhook ) print 1 index = } //FAPI_hook_debug exec
  dup /FAPI known {
    { //PrintFontRef exec ( is mapped to FAPI=) print dup /FAPI get = } //FAPI_hook_warn exec
    true //.FAPIrebuildfont //ChooseDecoding exec
  } {
    dup /PathLoad known dup {
      { (PathLoad known for the font ) print //PrintFontRef exec (.) = } //FAPI_hook_debug exec
    } {
      pop //FAPI_is_hook_disabled exec dup
      { pop
        { (FAPIhook is in .loadfont context for the font ) print //PrintFontRef exec (.) = } //FAPI_hook_debug exec
        true
      } if
    } ifelse
    { /HookDiskFonts } { /HookEmbeddedFonts } ifelse
    //Config exch get                                  % name <<font>> [types]
    1 index //GetFontType exec //FindInArray exec      % name <<font>> bHook
    { { (Trying to render the font ) print //PrintFontRef exec ( with FAPI...) = } //FAPI_hook_debug exec
      //.FAPIpassfont {
        { //PrintFontRef exec ( is being rendered with FAPI=) print dup /FAPI get = } //FAPI_hook_warn exec
        false //.FAPIrebuildfont //ChooseDecoding exec
      } {
        { (Can't render ) print //PrintFontRef exec ( with FAPI, will do with native GS renderer.) = } //FAPI_hook_warn exec
      } ifelse
    } {
      { (The font ) print //PrintFontRef exec ( doesn't need to render with FAPI.) = } //FAPI_hook_debug exec
    } ifelse
  } ifelse
} bind def

/FAPIhook  %      <string|name> <font_dict> .FAPIhook <string|name> <font>
{ //is_device_compatible_to_FAPI exec
  { //FAPIhook_aux exec
  } {
    { (FAPIhook is disabled for the current device.) = } //FAPI_hook_debug exec
  } ifelse
} bind def

% ------------------ Redefine .buildfont* with FAPI : -----------------------

/.buildfont1
{ //.buildfont1 exec //FAPIhook exec
} bind % 'odef' is below.

/.buildfont2
{ //.buildfont2 exec //FAPIhook exec
} bind % 'odef' is below.

/.buildfont42
{ //.buildfont42 exec //FAPIhook exec
} bind % 'odef' is below.

/.buildfont9
{ //.buildfont9 exec //FAPIhook exec
} bind % 'odef' is below.

/.buildfont10
{ //.buildfont10 exec //FAPIhook exec
} bind % 'odef' is below.

/.buildfont11
{ //.buildfont11 exec //FAPIhook exec
} bind % 'odef' is below.

end % the temporary dictionary for local binding.
odef odef odef odef odef odef

.setlanguagelevel

%END FAPI