summaryrefslogtreecommitdiff
path: root/Master/xemtex/gslib/viewpbm.ps
blob: 2ba6907e48f8f3c0e748a0a58d2b6ad5805f7d56 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
%    Copyright (C) 1992, 1995, 1996, 1998, 1999 Aladdin Enterprises.  All rights reserved.
% 
% This program is free software; you can redistribute it and/or modify it
% under the terms of the GNU General Public License as published by the
% Free Software Foundation; either version 2 of the License, or (at your
% option) any later version.
%
% This program is distributed in the hope that it will be useful, but
% WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
% Public License for more details.
%
% You should have received a copy of the GNU General Public License along
% with this program; if not, write to the Free Software Foundation, Inc.,
% 59 Temple Place, Suite 330, Boston, MA, 02111-1307.

% $Id: viewpbm.ps,v 1.2.6.2.2.1 2003/04/12 14:02:39 giles Exp $
% viewpbm.ps
% Display a PBM/PGM/PPM file.
% Requires the Level 2 `image' operator (to handle variable pixel widths).
% If SCALE is defined, maps input pixels to output pixels with that scale;
% if SCALE is undefined, scales the image to fit the page.

/s 100 string def
/readmaxv {		% <file> readmaxv -
  10 string readline pop cvx exec /maxv exch def
} bind def
/readrow {		% <file> <row> readrow <row>
  0 1 2 index length 1 sub {
    1 index exch 3 index token pop put
  } for exch pop
} bind def
/read01 {		% <file> <count> read01 <byte>
  0 exch {
    1 index read pop 48 xor dup 1 le { exch dup add add } { pop } ifelse
  } repeat
} bind def
/readrow01 {		% <file> <row> readrow01 <row>
  0 1 w 8 idiv {
    1 index exch 3 index 8 read01 put
  } for
  wrem 0 ne {
     dup rsize 1 sub wrem read01 8 wrem sub bitshift put
  } if
  exch pop
} bind def
/readwh {		% <file> readwh <w> <h>
 dup s readline pop		% check for comment
 (#) anchorsearch {
   pop pop dup s readline pop
 } if
 cvx exec
} bind def
/pbmtypes mark
% The procedures in this dictionary are called as
%	<file> Pn <w> <h> <readproc>
/P1 {			% ASCII 1-bit white/black
  /bpc 1 def /maxv 1 def /rsize w 7 add 8 idiv def
  /wrem w 8 mod def
  /ncomp 1 def /invert true def /DeviceGray setcolorspace
  readwh
	{ readrow01 }
} bind
/P2 {			% ASCII 8-bit gray
  readwh
  /bpc 8 def 2 index readmaxv /rsize 2 index def
  /ncomp 1 def /invert false def /DeviceGray setcolorspace
	{ readrow }
} bind
/P3 {			% ASCII 8-bit RGB
  readwh
  /bpc 8 def 2 index readmaxv /rsize 2 index 3 mul def
  /ncomp 3 def /invert false def /DeviceRGB setcolorspace
	{ readrow }
} bind
/P4 {			% Binary 1-bit white/black
  readwh
  /bpc 1 def /maxv 1 def /rsize 2 index 7 add 8 idiv def
  /ncomp 1 def /invert true def /DeviceGray setcolorspace
	{ readstring pop }
} bind
/P5 {			% Binary 8-bit gray
  readwh
  /bpc 8 def 2 index readmaxv /rsize 2 index def
  /ncomp 1 def /invert false def /DeviceGray setcolorspace
	{ readstring pop }
} bind
/P6 {			% Binary 8-bit RGB
  readwh
  /bpc 8 def 2 index readmaxv /rsize 2 index 3 mul def
  /ncomp 3 def /invert false def /DeviceRGB setcolorspace
	{ readstring pop }
} bind
.dicttomark readonly def
/pbmsetup {			% <file> <w> <h> <readproc> runpbm -
   /readproc exch def
   /h exch def
   /w exch def
   /f exch def
   20 dict begin		% image dictionary
     /ImageType 1 def
     /Width w def
     /Height h def
     /ImageMatrix [w 0 0 h neg 0 h] def
     /BitsPerComponent bpc def
     /Decode [ 0 255 maxv div invert { exch } if ncomp 1 sub { 2 copy } repeat ] def
     /DataSource [ f rsize string /readproc load /exec load ] cvx def
   currentdict end
} def
/imagescale {			% <imagedict> imagescale -
  begin
    /SCALE where {
      pop
	% Map pixels SCALE-for-1.  Assume orthogonal transformation.
      Width 1 0 dtransform add abs div SCALE mul
      Height 0 1 dtransform add abs div SCALE mul
    } {
	% Scale the image (uniformly) to fit the page.
      clippath pathbbox pop pop translate
      pathbbox .min exch pop exch pop ceiling
      dup Height Width gt {
	Width mul Height div exch
      } {
	Height mul Width div
      } ifelse
    }
    ifelse scale
  end
} def

% Image a PBM file page by page.
/viewpbm {			% <filename> viewpbm -
  20 dict begin
    (r) file /pf exch def {
      pf token not { exit } if
      pbmtypes exch get pf exch exec pbmsetup
      dup imagescale image showpage
    } loop
  end
} def

% Reassemble a composite PBM file from the CMYK separations.
/viewpsm {
  20 dict begin
    /fname exch def
    /sources [ 0 1 3 {
      /plane exch def 
      /pf fname (r) file def
      pf pbmtypes pf token pop get exec
		% Stack: pf w h readproc
      plane {
	/readproc exch def /h exch def /w exch def pop
	/row rsize string def
	h { pf row readproc pop } repeat
	pf pbmtypes pf token pop get exec
      } repeat
      pbmsetup
    } for ] def
    /datas [ sources { /DataSource get 0 get } forall ] def
    /decode sources 0 get /Decode get
      dup 0 get exch 1 get add cvi 0 exch
      2 copy 4 copy 8 array astore def
    sources 0 get
      dup /MultipleDataSources true put
      dup /DataSource datas put
      dup /Decode decode put
    /DeviceCMYK setcolorspace
    dup imagescale image showpage
  end
} def

% If the program was invoked from the command line, run it now.
[ shellarguments
 { counttomark 1 ge
    { ] { viewpbm } forall
    }
    { cleartomark
      (Usage: gs [--] viewpbm.ps filename.p*m ...\n) print
      ( e.g.: gs [--] viewpbm.ps my.ppm another.ppm\n) print flush
    }
   ifelse
 }
 { pop
 }
ifelse