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-% Copyright (C) 1992, 1996 Aladdin Enterprises. 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: impath.ps 6300 2005-12-28 19:56:24Z giles $
-% impath.ps
-% Reverse-rasterize a bitmap to produce a Type 1 outline.
-% (This was formerly a Ghostscript operator implemented in C.)
-
-% <image> <width> <height> <wx> <wy> <ox> <oy> <string>
-% type1imagepath <substring>
-% Converts an image (bitmap) description of a character into
-% a scalable description in Adobe Type 1 format. The
-% current transformation matrix should be the same as the
-% FontMatrix of the font in which this character will be
-% used: this establishes the scaling relationship between
-% image pixels (the image is assumed to be 1 unit high in
-% user space) and the character coordinate system used in
-% the scalable description. wx and wy are the character
-% width, and ox and oy are the character origin relative
-% to the lower left corner of the bitmap, in *pixels*.
-% The image is assumed to be stored in left-to-right,
-% top-to-bottom order. Note that this is not consistent
-% with the `image' operator's interpretation of the CTM.
-% All coordinates in the scalable description are rounded to
-% integers, so the coefficients in the FontMatrix should
-% be on the order of 1/N for some value of N that is
-% either a multiple of the height/width or is large
-% compared to the width and height. (There is a
-% convention, which some PostScript programs rely on, that
-% N=1000.)
-% Note that the encoded description has *not* been subjected
-% to CharString encryption, which is necessary before the
-% description can be given to type1addpath: to do this,
-% follow the type1imagepath with
-% 4330 exch dup .type1encrypt exch pop
-% If the description is too complex to fit into the supplied
-% string, a limitcheck error results. A good rule of
-% thumb is that the size of the string should be about 6
-% times the number of 1-bits in the image that are not
-% completely surrounded by other 1-bits.
-
-% Import the Type 1 opcodes.
-(type1ops.ps) runlibfile
-
-100 dict
-dup /type1imagepath_dict exch def
-begin
-
-/rc { round cvi } bind def
-/moving [/rmoveto /hmoveto /vmoveto] def
-/drawing [/rlineto /hlineto /vlineto] def
-
-% Convert the current path to a Type 1 token array.
-/putxy % x y ops -> cs_elements
- { 3 -1 roll dup x sub rc exch /x exch def
- 3 -1 roll dup y sub rc exch /y exch def
- % stack: ops dx dy
- dup 0 eq
- { % dy = 0, use hmoveto/lineto
- pop exch 1 get
- }
- { 1 index 0 eq
- { % dx = 0, use vmoveto/lineto
- exch pop exch 2 get
- }
- { % use rmoveto/rlineto
- 3 -1 roll 0 get
- }
- ifelse
- }
- ifelse
- } bind def
-/pathtotype1 % -> charstack
- { 3 dict begin /x 0 def /y 0 def
- mark
- { moving putxy
- }
- { drawing putxy
- }
- { % Convert curve to relative form
- x y 3
- { exch neg 7 index add rc
- exch neg 6 index add rc
- 8 -2 roll
- }
- repeat /y exch def /x exch def
- 1 index 0 eq 5 index 0 eq and % dy1=dx3=0, hv
- { 5 -1 roll pop exch pop /hvcurveto
- }
- { dup 0 eq 6 index 0 eq and % dx1=dy3=0, vh
- { 6 -1 roll pop pop /vhcurveto
- }
- { /rrcurveto % none of the above
- }
- ifelse
- }
- ifelse
- }
- { /closepath
- }
- pathforall end
- } bind def
-
-end % type1imagepath_dict
-
-% The main program
-/type1imagepath % image width height wx wy ox oy string ->
- % substring
- { type1imagepath_dict begin
- /tsave save def
- /ostring exch def
- /oy exch def /ox exch def
- /wy exch def /wx exch def
- /height exch def /width exch def
- /data exch def
-
- /ofilter ostring /NullEncode filter def
- /raster width 7 add 8 idiv def
-
-% Construct the coordinate transformation.
- height dup scale
- matrix currentmatrix matrix invertmatrix setmatrix
-
-% Determine the left side bearing.
- /lsbx width
- 0 1 width 1 sub
- { dup dup 8 idiv 0 exch
- raster raster height mul 1 sub
- { data exch get or }
- for exch 8 mod bitshift 128 and 0 ne
- { exch pop exit }
- if pop
- }
- for def
-
-% Compute and encode the origin, width, and side bearing.
- mark
- ox oy dtransform
- rc /opty exch def rc /optx exch def
- wx wy dtransform
- rc /iwy exch def rc /iwx exch def
- lsbx ox sub 0 dtransform
- rc /ilsby exch def rc /ilsbx exch def
- ilsbx
- iwy 0 ne ilsby 0 ne or
- { ilsby iwx iwy /sbw }
- { iwx /hsbw }
- ifelse
- ofilter charstack_write
-
-% Flip over the Y axis, because the image is stored top-to-bottom.
- [1 0 0 -1 0 height] concat
-% Account for the character origin.
- lsbx oy translate
-% Trace the outline.
- newpath
- width height data .imagepath
- gsave matrix setmatrix pathtotype1 grestore
- ofilter charstack_write
-% Terminate the output
- mark /endchar ofilter charstack_write
-
- ofilter .fileposition ofilter closefile % flush buffers
- ostring 0 3 -1 roll getinterval
- tsave restore
- end
- } bind def