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97 lines
3.1 KiB
97 lines
3.1 KiB
1 year ago
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#!/bin/bash
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# A script to convert SVG into multiple sizes of PNG and compress them with pngcrush
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# todo :
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# figure out how to auto-scale rack images
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# depends on inkscape, pngcrush, awk
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pngcrushbin=pngcrush
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outputdir="${1:-png_modern}"
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sourcedir="svg"
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elementdir="$sourcedir/elements"
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pngcrushlog=pngcrush.log.txt
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pngcrushoutput=pngcrushoutput.txt
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inkscapelog=inkscape.log.txt
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crushpng() {
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$pngcrushbin -brute -reduce -e .2.png "$1" >> "$pngcrushoutput" || exit 1
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echo "$1 : $(echo "$(stat -c %s "${1%png}2.png")/$(stat -c %s "${1}")*100" | bc -l)" >> "$pngcrushlog"
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mv "${1%png}2.png" "$1"
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}
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svgtopng() {
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# parameters : svg, size, reported size, dimension
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# 3rd parameter allows to override "reported" size; if missing, actual size is used
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# 4th parameter allows to override width/height detection
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pngoutfile="$outputdir/$(basename ${1%.svg})_(${3:-$2}).png"
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[[ "$(stat -c "%Y" "$pngoutfile" 2>/dev/null)" -lt "$svgfilemod" ]] && {
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# if png file modification time is older than svg file modification time
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echo -n " to $2..."
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# we have to query image dimensions first, because export dimensions are used "as-is", resulting in a square rackmountable server, for example
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# inkscape option --query-all could be used, but it's not fully clear which layer is supposed to be "whole image"
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# crudely dropping decimal part, bash fails on it
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[[ "$4" ]] && {
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dimension=$4
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} || {
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[[ "$(inkscape --without-gui --query-width $1 | cut -d. -f1)" -gt "$(inkscape --without-gui --query-height $1 | cut -d. -f1)" ]] && {
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dimension=width
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} || {
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dimension=height
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}
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}
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inkscape --without-gui --export-$dimension=$2 $1 --export-png="$pngoutfile" >> "$inkscapelog" || exit 1
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echo -n " compress..."
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crushpng "$pngoutfile"
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} || {
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echo -n " skip $2..."
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}
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}
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mkdir -p "$outputdir"
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> "$pngcrushoutput"
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> "$pngcrushlog"
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> "$inkscapelog"
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svgelementcount=$(ls $elementdir | wc -l)
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for svgfile in $elementdir/*.svg; do
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echo -n "Converting $svgfile"
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((elementfilesdone++))
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svgfilemod=$(stat -c "%Y" "$svgfile")
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for size in 24 48 64 96 128; do
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# rackmountable device icons don't make much sense below size 64
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[[ "$svgfile" =~ Rackmountable_.* || "$svgfile" =~ Zabbix_server_.* || "$svgfile" =~ UPS_rackmountable.* ]] && [ "$size" -lt "64" ] && continue
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svgtopng "$svgfile" "$size"
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done
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echo "[$[$elementfilesdone*100/$svgelementcount]%]"
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done
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# rack images for now are converted with a fixed ratio
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rackimages=([64]=68 [96]=101 [128]=134)
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echo -n "Converting Rack_42.svg"
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for rackimagesize in "${!rackimages[@]}"; do
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svgtopng "$sourcedir/equipment_rack/Rack_42.svg" "${rackimages[$rackimagesize]}" "$rackimagesize" "width"
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done
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echo
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rackwithdoorimages=([64]=100 [96]=149 [128]=199)
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echo -n "Converting Rack_42_with_door.svg"
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for rackwithdoorimagesize in "${!rackwithdoorimages[@]}"; do
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svgtopng "$sourcedir/equipment_rack/Rack_42_with_door.svg" "${rackwithdoorimages[$rackwithdoorimagesize]}" "$rackwithdoorimagesize" "width"
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done
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echo
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[[ -s "$pngcrushlog" ]] && {
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echo "Biggest gain from pngcrush:"
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sort -n -r -t : -k 2 "$pngcrushlog" | tail -n 1
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awk 'BEGIN {FS=":"}; {sum+=$2} END { print "Average gain:",sum/NR}' "$pngcrushlog"
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}
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