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#!/bin/sh
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##
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## pdfresize -- resize a PDF document
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## Copyright (c) 2018 Ralf S. Engelschall <rse@engelschall.com>
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## Licensed under MIT license.
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##
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# determine parameters
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if [ $# -ne 3 ]; then
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echo "pdfresize: USAGE: pdfresize <scale-factor> <input-pdf> <output-pdf>" 1>&2
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exit 1
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fi
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scale="$1"
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input="$2"
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output="$3"
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# determine input size in 72PT units
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size=`pdfinfo $input | grep "Page size:" | sed -e 's;^[^0-9]*\([0-9]*\).*x \([0-9]*\).*;\1x\2;'`
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input_w=`echo $size | sed -e 's;x.*$;;'`
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input_h=`echo $size | sed -e 's;^.*x;;'`
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# calculate new size
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output_w=`(echo "scale = 0"; echo "$input_w * $scale" ) | @l_prefix@/bin/bc | sed -e 's;\..*;;'`
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output_h=`(echo "scale = 0"; echo "$input_h * $scale" ) | @l_prefix@/bin/bc | sed -e 's;\..*;;'`
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# perform resizing with the help of Ghostscript
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@l_prefix@/bin/gs \
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-q \
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-dNOPAUSE \
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-dBATCH \
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-sDEVICE=pdfwrite \
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-dSAFER \
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-dCompatibilityLevel="1.5" \
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-dPDFSETTINGS="/printer" \
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-dSubsetFonts=false \
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-dEmbedAllFonts=true \
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-r72 \
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-g${output_w}x${output_h} \
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-sOutputFile=$output \
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-c "<</BeginPage{ $scale $scale scale 0 0 translate}>> setpagedevice" \
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-f $input
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