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% Copyright (C) 2017-2023 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., 39 Mesa Street, Suite 108A, San Francisco,
% CA 94129, USA, for further information.
%
% viewpwg.ps
% Display a PWG file.
% VPWGDEBUG can be predefined to be true to get debugging.
% /VPWGDEBUG false def
/VPWGDEBUG where { pop } { /VPWGDEBUG false def } ifelse
/read1 % <file> read1 <int>
{ read pop
} bind def
/read2 % <file> read2 <int>
{ dup read1 8 bitshift exch read1 add
} bind def
/read4 % <file> read4 <int>
{ dup read2 16 bitshift exch read2 add
} bind def
/readString % <file> readString <string>
{ 0 string
dup
0 1 63
{ % <file> <string> <string> <iteration>
3 index read pop
% <file> <string> <string> <iteration> <char>
dup 0 eq {pop pop} {put dup} ifelse
}
for
pop
exch pop
} bind def
/readReserved % <file> readReserved -
{ read4 0 ne
{ (Reserved field not zero.\n) print cleartomark stop }
if
} bind def
/readBoolean % <file> readBoolean <bool>
{ read4 dup 0 eq
{ pop false }
{ 1 eq
{ 0 }
{ (Boolean not a boolean.\n) print cleartomark stop }
ifelse
}
ifelse
} bind def
/readPWGheader % <file> readPWGheader <dict>
{ 20 dict begin
dup 4 string readstring pop
<52615332> eq not
{ (Not a PWG file.\n) print cleartomark stop
} if
pop
currentdict end
} bind def
/readPWGpageHeader % <file> readPWGpageHeader <dict>
% Note: PWG header must be on dict stack
{ 10 dict begin
dup readString /PwgRaster exch def
dup readString /MediaColor exch def
dup readString /MediaType exch def
dup readString /PrintContentOptimize exch def
dup readReserved
dup readReserved
dup readReserved
dup read4 /CutMedia exch def
dup readBoolean /Duplex exch def
dup read4 /HWResolutionX exch def
dup read4 /HWResolutionY exch def
dup readReserved
dup readReserved
dup readReserved
dup readReserved
dup readBoolean /InsertSheet exch def
dup read4 /Jog exch def
dup read4 /LeadingEdge exch def
dup readReserved
dup readReserved
dup readReserved
dup read4 /MediaPosition exch def
dup read4 /MediaWeightMetric exch def
dup readReserved
dup readReserved
dup read4 /NumCopies exch def
dup read4 /Orientation exch def
dup readReserved
dup read4 /PageSizeX exch def
dup read4 /PageSizeY exch def
dup readReserved
dup readReserved
dup read4 /Tumble exch def
dup read4 /Width exch def
dup read4 /Height exch def
dup readReserved
dup read4 /BitsPerColor exch def
dup read4 /BitsPerPixel exch def
dup read4 /BytesPerLine exch def
dup read4 /ColorOrder exch def
dup read4 /ColorSpace exch def
dup readReserved
dup readReserved
dup readReserved
dup readReserved
dup read4 /NumColors exch def
dup readReserved
dup readReserved
dup readReserved
dup readReserved
dup readReserved
dup readReserved
dup readReserved
dup read4 /TotalPageCount exch def
dup read4 /CrossFeedTransform exch def
dup read4 /FeedTransform exch def
dup read4 /ImageBoxLeft exch def
dup read4 /ImageBoxTop exch def
dup read4 /ImageBoxRight exch def
dup read4 /ImageBoxBottom exch def
dup read4 /AlternatePrimary exch def
dup read4 /PrintQuality exch def
dup readReserved
dup readReserved
dup readReserved
dup readReserved
dup readReserved
dup read4 /VendorIdentifier exch def
dup read4 /VendorLength exch def
% Skip 1088 bytes of VendorData
1088 { dup read pop pop } repeat
% 64 Reserved bytes
dup readReserved dup readReserved dup readReserved dup readReserved
dup readReserved dup readReserved dup readReserved dup readReserved
dup readReserved dup readReserved dup readReserved dup readReserved
dup readReserved dup readReserved dup readReserved dup readReserved
dup readString /RenderingIntent exch def
dup readString /PageSizeName exch def
pop
currentdict end
} bind def
/viewPWG % <file|string> viewPWG -
{ save 20 dict begin
/saved exch def
dup type /stringtype eq { (r) file } if
/F exch def
F readPWGheader /Header exch def
% We have a dictionary with /saved, /F and /Header on the stack.
% Debug dump Header fields.
VPWGDEBUG { Header { exch == == } forall (----------------\n) print flush } if
{
% If we have no bytes left, stop
F bytesavailable 0 le { exit } if
% Read the page header.
F readPWGpageHeader /PageHeader exch def
% Push PageHeader onto the dict stack.
PageHeader begin
% Debug dump the Page Header.
VPWGDEBUG { PageHeader { exch == == } forall (----------------\n) print flush } if
% Define D to be the decoded data from F.
/D F
<</Width Width
/BPP BitsPerPixel
>> /PWGDecode filter def
% Set the Colorspace appropriately.
ColorSpace dup dup 3 eq exch 18 eq or exch 48 eq or
{ % Black or SGray or Device1
/DeviceGray setcolorspace
/NumComponents 1 def
}
{ ColorSpace dup dup dup 1 eq exch 19 eq or exch 20 eq or exch 50 eq or
{ % Rgb or sRGB or AdobeRGB or Device3
/DeviceRGB setcolorspace
/NumComponents 3 def
}
{ ColorSpace dup 6 eq exch 51 eq or
{ % DeviceCMYK or Device4
/DeviceCMYK setcolorspace
/NumComponents 4 def
}
{ (Unsupported colorspace in PWG file.\n) print cleartomark stop
}
ifelse
}
ifelse
}
ifelse
% Do some matrixy stuff I don't understand.
matrix currentmatrix
0 1 3 { 2 copy get dup 0 ne { dup abs div } if 3 copy put pop pop } for
setmatrix
<<
/ImageType 1
/ImageMatrix [1 0 0 -1 0 Height]
/BitsPerComponent BitsPerPixel NumComponents div
/Width Width
/Height Height
/DataSource D
>> image
% Bin the PageHeader dictionary
end
showpage
}
loop
saved end restore
} bind def
% This lets you do stuff on the command line like:
% gs -sDEVICE=pdfwrite -o stuff%03d.pdf viewurf.ps -c "(image.urf) << /PageSize 2 index viewURFgetsize 2 array astore >> setpagedevice viewURF"
% so the output size is influenced by the original image.
%/viewURFgetsize % <file|string> ==> [width height]
%{
% save 20 dict begin
% /saved exch def
% dup type /stringtype eq { (r) file } if
% /F exch def
% F readURFheader /Header exch def
% currentdict Header end begin begin
% VPWGDEBUG { Header { exch == == } forall (----------------\n) print flush } if
% F readURFimageHeader /ImageHeader exch def
% currentdict ImageHeader end begin begin
% F 0 setfileposition % reset file pointer
% Width Height
% saved end end end restore
%} bind def
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