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Diffstat (limited to 'lib/viewpbm.ps')
| -rw-r--r-- | lib/viewpbm.ps | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/lib/viewpbm.ps b/lib/viewpbm.ps new file mode 100644 index 000000000..114c3910b --- /dev/null +++ b/lib/viewpbm.ps @@ -0,0 +1,225 @@ +% Copyright (C) 2001-2012 Artifex Software, Inc. +% 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. +% +% Refer to licensing information at http://www.artifex.com or contact +% Artifex Software, Inc., 7 Mt. Lassen Drive - Suite A-134, San Rafael, +% CA 94903, U.S.A., +1(415)492-9861, for further information. +% + +% 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. +% If FITPAGE true, it fits the output page size to the image, honouring SCALE + +/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 + /FITPAGE where {/FITPAGE get}{false} ifelse + { + Width 72 mul SCALE mul Height 72 mul SCALE mul + } + { + % 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 + } ifelse + } { + /FITPAGE where {/FITPAGE get}{false} ifelse + { + Width 72 mul Height 72 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 + } + 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 + /FITPAGE where + { + /FITPAGE get + { + /SCALE where + { + pop + <</PageSize [w 72 mul SCALE mul h 72 mul SCALE mul] >> + } + { + <</PageSize [w 72 mul h 72 mul] >> + } ifelse + setpagedevice + } if + } if + 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 + /FITPAGE where + { + /FITPAGE get + { + /SCALE where + { + <</PageSize [w SCALE mul h SCALE mul]>> + } + { + <</PageSize [w h]>> + }ifelse + setpagedevice + } if + } if + 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 |