Optimize assets, again

[lumiscosity]

learned a few new tricks since last time! mostly single-byte improvements but some sprites like the new icon and atlas texture weren't compressed at all yet, plus the book got some bigger wins too.

[sisby-folk]

command ran?

[lumiscosity]

function rcomp() {
    find . -name "*.png" -type f -exec oxipng -o max -a -s {} \;
    find . -name "*.png" -type f -exec pngout {} \;
    find . -name "*.png" -type f -exec oxipng -o max --zopfli -a -s {} \;
    find . -name "*.png" -type f -exec defluff-shim {} \;
    find . -name "*.png" -type f -exec deflopt {} \;
}

where pngout is a wrapper around PNGOUT.EXE:

#!/usr/bin/env bash
# this arcane incantation converts linux paths to windows paths in the first arg
# you'll see it again in a second
set -- $(echo "$1" | sed 's/\//\\/g') "${@:2}"
# you can try different values after b, but i've found 128 to give the best results
wine /usr/bin/pngout.exe "$@" "/b128" "/k1" "/q"

and defluff-shim is a wrapper around defluff:

#!/usr/bin/env bash
if [ $# -eq 1 ]; then
  defluff < "$1" > ~/.cache/defluff-shim-tmp.png
  oldsize=$(wc -c < "$1")
  newsize=$(wc -c < ~/.cache/defluff-shim-tmp.png)
  if [[ newsize -lt oldsize ]]; then
    rm "$1"
    mv ~/.cache/defluff-shim-tmp.png "$1"
  else
    rm ~/.cache/defluff-shim-tmp.png
  fi
else
  echo 'usage: defluff-shim (path)'
fi

and deflopt is a wrapper around deflopt:

#!/usr/bin/env bash
set -- $(echo "$1" | sed 's/\//\\/g') "${@:2}"
wine /usr/bin/DeflOpt.exe "$@"

defluff and deflopt are the final steps that shave off the last tiny bytes by, as far as i understand it, optimizing the headers. pngout is a png compressor with different characteristics than opti/oxipng, it seems to excel at images with large blobs of shared color and small amounts of color from what i can tell. chaining it between the two oxipng calls gave me the best results

i'll probably make a blogpost about this sometime...