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% Prologue for a DVI job.
% It assumes psprint has defined dev (string), land (bool) and res (int).

dev (LW) eq                               % LaserWriter?
{ land
  {                                       % /landscape given
    % rotate/scale/translate can cause scaling problems, so use setmatrix:
    version cvr 38.0 le
    { [ 0 -1 1 0 245 3135 ] setmatrix }   % LaserWriter
    { version cvr 47.0 lt
    { [ 0 -1 1 0 235 3130 ] setmatrix }   % LaserWriter Plus
    { [ 0 -1 1 0 235 3160 ] setmatrix }   % LaserWriter II NTX
                 % add y to move origin down by y pixels
                     % add x to move origin left by x pixels
    ifelse } ifelse
  }
  {                                       % /landscape not given
    % scale/translate can cause scaling problems, so use setmatrix:
    version cvr 38.0 le
    { [ 1 0 0 1 235 190 ] setmatrix }     % LaserWriter
    { version cvr 47.0 lt
    { [ 1 0 0 1 235 215 ] setmatrix }     % LaserWriter Plus
    { [ 1 0 0 1 235 265 ] setmatrix }     % LaserWriter II NTX
                % add x to move origin right by x pixels
                    % add y to move origin down by y pixels
    ifelse } ifelse
  } ifelse
} if

dev (PS40) eq                         % PrintServer?
{ land
  { [ 1 0 0 1 300 300 ] setmatrix     % /landscape given
  }
  { [ 0 1 -1 0 3210 300 ] setmatrix   % /landscape not given
  } ifelse
} if

dev (LINO) eq                         % Linotronic?
{ land
  { initmatrix                        % /landscape given
    90 rotate                         % rotate axes 90deg anticlockwise
    72 res div dup neg scale          % units now dots (y increases to right)
    res res translate                 % move to TeX origin

    % setmatrix won't work properly with a3/a4/a5/b5 page setups
    % [1 0 0 1 1270 margin 72 div 1270 mul add 1270] setmatrix   % res=1270
    % [2 0 0 2 1270 margin 72 div 1270 mul add 1270] setmatrix   % res=635
  }
  { initmatrix                        % /landscape not given
    newpath clippath pathbbox         % push LLx LLy URx URy
    /paperht exch 72 div def          % paper height in inches (URy = ht in pts)
    pop pop pop                       % URx LLy LLx
    72 res div dup neg scale          % units now dots (y increases down page)
    res paperht res mul neg res add
                          translate   % move to TeX origin

    % setmatrix won't work properly with a3/a4/a5/b5 page setups
    % [0 1 -1 0 paperht 1270 mul 1270 sub                        % res=1270
    %           margin 72 div 1270 mul add 1270] setmatrix
    % [0 2 -2 0 paperht 1270 mul 1270 sub                        % res=635
    %           margin 72 div 1270 mul add 1270] setmatrix
  } ifelse
} if

/mtrx 6 array def
mtrx currentmatrix pop                % save our new transformation matrix

/@newfont                             % initialize new font dict
{ /fontid exch def
  fontid 7 dict def
  fontid load begin
     /FontType 3 def
     /FontMatrix [1 0 0 -1 0 0] def   % -1 because y scale is negative
     /FontBBox [0 0 1 1] def
     /BitMaps 128 array def
     /BuildChar {CharBuilder} def
     /Encoding 128 array def
     0 1 127 {Encoding exch /.notdef put} for
     end
  fontid fontid load definefont pop
} def

% @saveVM and @restoreVM are only used if we are conserving VM
% by downloading font bitmaps more often:

/@saveVM                              % save state of VM before using font
{ /prefontVM save def
  @newfont
} def

/@restoreVM {prefontVM restore} def

% The char data, a bitmap descriptor, is an array with 6 elements:

/ch-image  {ch-data 0 get} def        % the hex string image
/ch-width  {ch-data 1 get} def        % the number of pixels across
/ch-height {ch-data 2 get} def        % the number of pixels tall
/ch-xoff   {ch-data 3 get} def        % number of pixels to left of origin
/ch-yoff   {ch-data 4 get} def        % number of pixels below origin
/ch-advw   {ch-data 5 get} def        % advance width

% The following character builder looks up the char data in the BitMaps array
% and paints the character:

/CharBuilder                          % image one char
{ /ch-code exch def                   % save the char code
  /font-dict exch def                 % and the font dict
  /ch-data font-dict /BitMaps get
  ch-code get def
     ch-advw 0
     ch-xoff neg ch-height ch-yoff sub 1 sub neg   % -xo , -(ht-yo-1)
     ch-width ch-xoff sub 1 sub ch-yoff            % (wd-xo-1) , yo
  setcachedevice
     ch-width ch-height true
     [1 0 0 -1 ch-xoff ch-yoff]       % bitmap sent top to bottom
     {ch-image}
  imagemask
} def

/sf {setfont} def                     % set current font

/dc                                   % define new character
{ /ch-code exch def
  /ch-data exch def

  % The following code should be enabled if you have an old LaserWriter.
  % It attempts to overcome a bug that causes the printer to crash
  % and print a test page rather then report a VMerror.
  %
  % vmstatus                          % returns: savelevel vmused vmmax
  % 10000 sub gt                      % is vmused > (vmmax-10000)?
  %   { pop VMERROR }                 % causes error message (avoiding crash)
  %   { pop }                         % pop savelevel
  % ifelse

  currentfont /BitMaps get ch-code ch-data put
  currentfont /Encoding get ch-code
  dup (   ) cvs cvn put               % generate unique name
} bind def

/@bop0 {pop} def                      % begin DVI page n

/@bop1                                % begin setting DVI page n
{ pop                                 % throw away page number
  initgraphics                        % start with a clean slate
  mtrx setmatrix                      % switch to our TeX coordinate system
  /prepageVM save def                 % save state of VM at start of page
} def

/@eop                                 % end DVI page n
{ pop                                 % throw away page number
  prepageVM restore                   % restore VM to state at start of page
  showpage
} def

/@end { } def                         % end of file

% h and s are used to typeset downloaded bitmap fonts:

/h {exch 0 rmoveto show} bind def     % move right by dh and show (...)

/s {3 1 roll moveto show} bind def    % move to h,v and show (...)

% H and S are used to typeset resident PostScript fonts.
% We can't use relative horizontal positioning because the advance widths in
% a PostScript font are not integers and rounding errors would accumulate:

/H {exch v moveto show} bind def      % move to h,v and show (...)

/S                                    % ditto, and save v position
{ 3 1 roll dup /v exch def
  moveto show
} bind def

% Some fine-tuning of the code used to draw a rule is necessary:

dev (LW) eq                           % LaserWriter?
version cvr 38.0 le and               % and version <= 38.0?
{
  /r                                  % set a wd by ht rule at h,v
  { newpath
    1 add moveto                      % move to h,v+1 (don't ask me why)
    /ht exch 1 sub def                % reduce height by 1
    /wd exch 1 sub def                % ditto for width
    wd 0 rlineto
    0 ht neg rlineto
    wd neg 0 rlineto
    fill
  } bind def
}
{
  /r                                  % set a wd by ht rule at h,v
  { newpath
    moveto                            % move to h,v
    /ht exch 1 sub def                % reduce height by 1
    /wd exch 1 sub def                % ditto for width
    wd 0 rlineto
    0 ht neg rlineto
    wd neg 0 rlineto
    fill
  } bind def
} ifelse

% Following procedures are invoked as the result of a \special command.
% We change all scaling and graphics back to defaults, but shift the origin
% to the current position on the page:

/p {moveto} bind def                  % move to h,v

/@bsp                                 % begin special mode
{ gsave
  /prespecialVM save def              % save showpage, TeX procedures etc.
  currentpoint transform
  initgraphics itransform translate
  land { 90 rotate } if               % rotate axes if /landscape given
  /showpage { } def                   % user does not have to remove showpage
} bind def

/@esp                                 % end special mode
{ prespecialVM restore                % restore saved showpage value etc.
  grestore
} bind def

% Here are the definitions needed to handle resident PostScript fonts:

/sp                                   % scaled pts to dots
{ 16#10000 div                        % scaled pts to pts
  res mul 72.27 div                   % pts to dots
} bind def

/PSfont                               % uses dot size and TFM name
{ dup /Times-Slanted eq
  {pop /Times-Roman findfont [1 0 .268 -1 0 0] makefont exch scalefont setfont}
  {findfont [1 0 0 -1 0 0] makefont exch scalefont setfont}
  ifelse
} bind def