+#!/bin/sh
+
+set -e
+
+: ${CACHEDIR:=$HOME/.xonotic-cached-converter}
+: ${do_jpeg:=true}
+: ${jpeg_qual_rgb:=95}
+: ${jpeg_qual_a:=99}
+: ${do_dds:=true}
+: ${dds_flags:=}
+: ${do_ogg:=false}
+: ${ogg_qual:=1}
+
+tmpdir=`mktemp -d -t cached-converter.XXXXXX`
+trap 'exit 1' INT
+trap 'rm -rf "$tmpdir"' EXIT
+
+cached()
+{
+ method=$1; shift
+ infile1=$1; shift
+ infile2=$1; shift
+ outfile1=$1; shift
+ outfile2=$1; shift
+ options=`echo "$*" | git hash-object --stdin`
+ sum=`git hash-object "$infile1"`
+ if [ -n "$infile2" ]; then
+ sum=$sum`git hash-object "$infile2"`
+ fi
+ mkdir -p "$CACHEDIR/$method-$options"
+ name1="$CACHEDIR/$method/$sum-1.${outfile1##*.}"
+ [ -z "$outfile2" ] || name2="$CACHEDIR/$method/$sum-2.${outfile2##*.}"
+ tempfile1="$name1.new"
+ [ -z "$outfile2" ] || tempfile2="$name2.new"
+ if "$method" "$infile1" "$infile2" "$tempfile1" "$tempfile2" "$@"; then
+ mv "$tempfile1" "$name1"
+ [ -z "$outfile2" ] || mv "$tempfile2" "$name2"
+ ln "$name1" "$outfile1" 2>/dev/null || cp "$name1" "$outfile1"
+ [ -z "$outfile2" ] || ln "$name2" "$outfile2" 2>/dev/null || cp "$name2" "$outfile2"
+ else
+ rm -f "$tempfile1"
+ rm -f "$tempfile2"
+ exit 1
+ fi
+}
+
+reduce_jpeg2_dds()
+{
+ i=$1; shift
+ ia=$1; shift
+ o=$1; shift; shift
+ convert "$i" "$ia" -compose CopyOpacity -composite "$tmpdir/x.png" && \
+ nvcompress -alpha -bc3 $1 "$tmpdir/x.png" "$o"
+}
+
+reduce_jpeg2_jpeg2()
+{
+ i=$1; shift
+ ia=$1; shift
+ o=$1; shift
+ oa=$1; shift
+ cp "$i" "$o" && jpegoptim --strip-all -m"$1" "$o" && \
+ cp "$ia" "$oa" && jpegoptim --strip-all -m"$2" "$oa"
+}
+
+reduce_jpeg2_jpeg2()
+{
+ i=$1; shift; shift
+ o=$1; shift; shift
+ cp "$i" "$o" && jpegoptim --strip-all -m"$1" "$o"
+}
+
+reduce_ogg()
+{
+ i=$1; shift; shift
+ o=$1; shift; shift
+ oggdec -o "$tmpdir/x.wav" "$i" && \
+ oggenc -q"$1" -o "$o" "$tmpdir/x.wav"
+}
+
+reduce_rgba_dds()
+{
+ i=$1; shift; shift
+ o=$1; shift; shift
+ nvcompress -alpha -bc3 $1 "$i" "$o"
+}
+
+reduce_rgba_jpeg2()
+{
+ i=$1; shift; shift
+ o=$1; shift
+ oa=$1; shift
+ convert "$X" -alpha extract -quality 100 "$o" && \
+ convert "$X" -alpha off -quality 100 "$oa" && \
+ jpegoptim --strip-all -m"$1" "$o" && \
+ jpegoptim --strip-all -m"$2" "$oa"
+}
+
+reduce_rgb_dds()
+{
+ i=$1; shift; shift
+ o=$1; shift; shift
+ nvcompress -bc1 $1 "$i" "$o"
+}
+
+reduce_rgb_jpeg()
+{
+ i=$1; shift; shift
+ o=$1; shift; shift
+ convert "$X" "$o" && \
+ jpegoptim --strip-all -m"$1" "$o"
+}
+
+
+for F in "$@"; do
+ case "$F" in
+ *_alpha.jpg)
+ # handle in *.jpg case
+ ;;
+ *.jpg)
+ if [ -f "${F%.jpg}_alpha.jpg" ]; then
+ cached "$do_jpeg" reduce_jpeg2_jpeg2 "$F" "${F%.*}_alpha.jpg" "$F" "${F%.*}_alpha.jpg" "$jpeg_qual_rgb"
+ cached "$do_jpeg" reduce_jpeg2_dds "$F" "${F%.*}_alpha.jpg" "$F" "${F%.*}_alpha.jpg" "$jpeg_qual_rgb"
+ else
+ cached "$do_jpeg" reduce_jpeg_jpeg "$F" "" "$F" "" "$jpeg_qual_rgb"
+ cached "$do_dds" reduce_rgb_dds "$F" "" "dds/${F%.*}.dds" "" "$dds_flags"
+ fi
+ ;;
+ *.png|*.tga)
+ if convert "$X" -depth 16 RGBA:- | perl -e 'while(read STDIN, $_, 8) { substr($_, 6, 2) eq "\xFF\xFF" or exit 1; ++$pix; } exit not $pix;'; then
+ cached "$do_jpeg" reduce_rgb_jpeg "$F" "" "${F%.*}.jpg" "" "$jpeg_qual_rgb"
+ cached "$do_dds" reduce_rgb_dds "$F" "" "dds/${F%.*}.dds" "" "$dds_flags"
+ else
+ cached "$do_jpeg" reduce_rgba_jpeg2 "$F" "" "${F%.*}.jpg" "${F%.*}_alpha.jpg" "$jpeg_qual_rgb" "$jpeg_qual_a"
+ cached "$do_dds" reduce_rgba_dds "$F" "" "dds/${F%.*}.dds" "" "$dds_flags"
+ fi
+ ;;
+ *.ogg)
+ cached "$do_ogg" reduce_ogg "$F" "" "$F" "" "$ogg_qual"
+ ;;
+ esac
+done