kaiten-sushi.sh

#!/bin/bash
set -ux

WORKDIR=`mktemp -d "tmp-image.XXXXXX"`

input=$1
output=$2

convert ${input} -background white -alpha deactivate -flatten -resize 128x128 ${WORKDIR}/input.png

# top left
for i in `seq 0 15`; do
  index=`expr $i + 0`
  move=`expr 128 - $i \* 8`
  convert ${WORKDIR}/input.png -virtual-pixel White -distort Affine "0,0 0,${move}" ${WORKDIR}/img-top-left-$(printf %02d $index).png
done
for i in `seq 0 15`; do
  index=`expr $i + 16`
  move=`expr $i \* 8`
  convert ${WORKDIR}/input.png -virtual-pixel White -distort Affine "0,0 ${move},0" ${WORKDIR}/img-top-left-$(printf %02d $index).png
done

# top right
for i in `seq 0 15`; do
  index=`expr $i + 0`
  move=`expr 128 - $i \* 8`
  convert ${WORKDIR}/input.png -virtual-pixel White -distort Affine "${move},0 0,0" ${WORKDIR}/img-top-right-$(printf %02d $index).png
done
for i in `seq 0 15`; do
  index=`expr $i + 16`
  move=`expr $i \* 8`
  convert ${WORKDIR}/input.png -virtual-pixel White -distort Affine "0,0 0,${move}" ${WORKDIR}/img-top-right-$(printf %02d $index).png
done

# bottom left
for i in `seq 0 15`; do
  index=`expr $i + 0`
  move=`expr 128 - $i \* 8`
  convert ${WORKDIR}/input.png -virtual-pixel White -distort Affine "0,0 ${move},0" ${WORKDIR}/img-bottom-left-$(printf %02d $index).png
done
for i in `seq 0 15`; do
  index=`expr $i + 16`
  move=`expr $i \* 8`
  convert ${WORKDIR}/input.png -virtual-pixel White -distort Affine "0,${move} 0,0" ${WORKDIR}/img-bottom-left-$(printf %02d $index).png
done

# bottom right
for i in `seq 0 15`; do
  index=`expr $i + 0`
  move=`expr 128 - $i \* 8`
  convert ${WORKDIR}/input.png -virtual-pixel White -distort Affine "0,${move} 0,0" ${WORKDIR}/img-bottom-right-$(printf %02d $index).png
done
for i in `seq 0 15`; do
  index=`expr $i + 16`
  move=`expr $i \* 8`
  convert ${WORKDIR}/input.png -virtual-pixel White -distort Affine "${move},0 0,0" ${WORKDIR}/img-bottom-right-$(printf %02d $index).png
done

# middle left
for i in `seq 0 15`; do
  index=`expr $i + 0`
  move=`expr $i \* 8`
  convert ${WORKDIR}/input.png -virtual-pixel White -distort Affine "0,${move} 0,0" ${WORKDIR}/img-middle-left-$(printf %02d $index).png
done
for i in `seq 0 15`; do
  index=`expr $i + 16`
  move=`expr 128 - $i \* 8`
  convert ${WORKDIR}/input.png -virtual-pixel White -distort Affine "0,0 0,${move}" ${WORKDIR}/img-middle-left-$(printf %02d $index).png
done

# middle right
for i in `seq 0 15`; do
  index=`expr $i + 0`
  move=`expr $i \* 8`
  convert ${WORKDIR}/input.png -virtual-pixel White -distort Affine "0,0 0,${move}" ${WORKDIR}/img-middle-right-$(printf %02d $index).png
done
for i in `seq 0 15`; do
  index=`expr $i + 16`
  move=`expr 128 - $i \* 8`
  convert ${WORKDIR}/input.png -virtual-pixel White -distort Affine "0,${move} 0,0" ${WORKDIR}/img-middle-right-$(printf %02d $index).png
done

# top center
for i in `seq 0 15`; do
  index=`expr $i + 0`
  move=`expr $i \* 8`
  convert ${WORKDIR}/input.png -virtual-pixel White -distort Affine "0,0 ${move},0" ${WORKDIR}/img-top-center-$(printf %02d $index).png
done
for i in `seq 0 15`; do
  index=`expr $i + 16`
  move=`expr 128 - $i \* 8`
  convert ${WORKDIR}/input.png -virtual-pixel White -distort Affine "${move},0 0,0" ${WORKDIR}/img-top-center-$(printf %02d $index).png
done

# bottom center
for i in `seq 0 15`; do
  index=`expr $i + 0`
  move=`expr $i \* 8`
  convert ${WORKDIR}/input.png -virtual-pixel White -distort Affine "${move},0 0,0" ${WORKDIR}/img-bottom-center-$(printf %02d $index).png
done
for i in `seq 0 15`; do
  index=`expr $i + 16`
  move=`expr 128 - $i \* 8`
  convert ${WORKDIR}/input.png -virtual-pixel White -distort Affine "0,0 ${move},0" ${WORKDIR}/img-bottom-center-$(printf %02d $index).png
done

convert -layers Optimize -loop 0 -delay 4 -colors 80 -fuzz 11% ${WORKDIR}/img-top-left-*.png top-left-${output}
convert -layers Optimize -loop 0 -delay 4 -colors 80 -fuzz 11% ${WORKDIR}/img-top-right-*.png top-right-${output}
convert -layers Optimize -loop 0 -delay 4 -colors 80 -fuzz 11% ${WORKDIR}/img-bottom-left-*.png bottom-left-${output}
convert -layers Optimize -loop 0 -delay 4 -colors 80 -fuzz 11% ${WORKDIR}/img-bottom-right-*.png bottom-right-${output}
convert -layers Optimize -loop 0 -delay 4 -colors 80 -fuzz 11% ${WORKDIR}/img-middle-left-*.png middle-left-${output}
convert -layers Optimize -loop 0 -delay 4 -colors 80 -fuzz 11% ${WORKDIR}/img-middle-right-*.png middle-right-${output}
convert -layers Optimize -loop 0 -delay 4 -colors 80 -fuzz 11% ${WORKDIR}/img-top-center-*.png top-center-${output}
convert -layers Optimize -loop 0 -delay 4 -colors 80 -fuzz 11% ${WORKDIR}/img-bottom-center-*.png bottom-center-${output}
rm -rf ${WORKDIR}