1#!/bin/bash
2
3# Copyright (C) 2014-2016 OpenDevise Inc. and the Asciidoctor Project
4
5# Permission is hereby granted, free of charge, to any person obtaining a copy
6# of this software and associated documentation files (the "Software"), to deal
7# in the Software without restriction, including without limitation the rights
8# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9# copies of the Software, and to permit persons to whom the Software is
10# furnished to do so, subject to the following conditions:
11
12# The above copyright notice and this permission notice shall be included in
13# all copies or substantial portions of the Software.
14
15# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21# THE SOFTWARE.
22
23# Optimizes and compresses the specified PDF using Ghostscript (gs).
24#
25# [NOTE]
26# You need at least Ghostscript 9.10 in order for page labels defined in the
27# PDF to be preserved (e.g., front matter pages numbered using roman numerals).
28
29if [ -z $1 ]; then
30   echo "Please supply a PDF file to optimize"
31   exit 1
32fi
33
34if [ -z $GS ]; then
35  GS=gs
36fi
37
38FILE=$1
39FILE_BASENAME=${FILE%.pdf}
40FILE_OPTIMIZED=$FILE_BASENAME-optimized.pdf
41FILE_PDFMARK=
42if [ -f "$FILE_BASENAME.pdfmark" ]; then
43  FILE_PDFMARK="$FILE_BASENAME.pdfmark"
44fi
45DOWNSAMPLE_IMAGES=true
46if [ -z $IMAGE_DPI ]; then
47  #IMAGE_DPI=150
48  IMAGE_DPI=300
49fi
50
51# /prepress defaults (see http://ghostscript.com/doc/current/Ps2pdf.htm)
52# -d{Color,Gray,Mono}ImageDownsampleType=/Bicubic
53# -dAutoFilter{Color,Gray}Images=true
54# -dOptimize=true
55# -dEmbedAllFonts=true
56# -dSubsetFonts=true
57# -dColorConversionStrategy=/LeaveColorUnchanged
58# -dUCRandBGInfo=/Preserve
59# -dCompressPages=true
60#
61# other unused settings
62# -r72
63#
64# for info about pdfmarks, see http://milan.kupcevic.net/ghostscript-ps-pdf
65#
66# to convert to grayscale, add the following (though doesn't always work)
67#
68# -dProcessColorModel=/DeviceGray \
69# -dColorConversionStrategy=/Gray \
70
71ERRFILE=$FILE_BASENAME-ERRS.optimize
72"$GS" -q -dNOPAUSE -dBATCH -dSAFER -dNOOUTERSAVE \
73  -sDEVICE=pdfwrite \
74  -dPDFSETTINGS=/prepress \
75  -dPrinted=false \
76  -dCannotEmbedFontPolicy=/Warning \
77  -dDownsampleColorImages=$DOWNSAMPLE_IMAGES \
78  -dColorImageResolution=$IMAGE_DPI \
79  -dDownsampleGrayImages=$DOWNSAMPLE_IMAGES \
80  -dGrayImageResolution=$IMAGE_DPI \
81  -dDownsampleMonoImages=$DOWNSAMPLE_IMAGES \
82  -dMonoImageResolution=$IMAGE_DPI \
83  -sOutputFile="$FILE_OPTIMIZED" \
84  "$FILE" $FILE_PDFMARK 2> $ERRFILE
85
86status=$?
87if test $status -ne 0 ; then
88    echo "$0: $GS return status = $status, aborting"
89elif grep -q Error $ERRFILE ; then
90    echo "$0: $GS succeeded but found Error in $ERRFILE (follows), aborting"
91    echo '---------- Errors from $GS ----------'
92    grep Error $ERRFILE
93    echo '-------------------------------------'
94    status=1
95else
96    rm -f $ERRFILE
97fi
98
99exit $status
100