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63 lines
2.1 KiB
Text
63 lines
2.1 KiB
Text
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#!/usr/bin/env bash
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# This script automates compressing PNG images using the lossless Zopfli
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# Compression Algorithm. The process is slow but can produce significantly
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# better compression and, thus, smaller file sizes.
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#
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# This script is meant to be run manually, for example, before making a new
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# release.
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#
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# Requirements
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#
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# zopflipng - https://github.com/google/zopfli
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# Debian/Ubuntu: sudo apt install zopfli
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# Fedora: sudo dnf install zopfli
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# macOS: brew install zopfli
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#
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# Usage
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#
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# This script takes a single positional argument which is the path where to
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# search for PNG files. By default, the target path is the current working
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# directory. Run from the root of the repository to compress all PNG images. Run
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# from the `frontend` subdirectory to compress all PNG images within that
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# directory. Alternatively, run from any directory and pass an explicit path to
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# `compress-png` to limit the script to that path/directory.
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set -o errexit
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set -o nounset
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set -o pipefail
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readonly TARGET="${1:-.}"
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readonly ABS_TARGET="$(command -v realpath &>/dev/null && realpath "$TARGET")"
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function png_total_size() {
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find "$TARGET" -type f -iname '*.png' -exec du -ch {} + | tail -1
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}
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echo "Compressing PNGs in ${ABS_TARGET:-$TARGET}"
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echo "Before"
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png_total_size
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readonly opts=(
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# More iterations means slower, potentially better compression.
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#--iterations=500
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-m
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# Try all filter strategies (slow).
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#--filters=01234mepb
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# According to docs, remove colors behind alpha channel 0. No visual
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# difference, removes hidden information.
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--lossy_transparent
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# Avoid information loss that could affect how images are rendered, see
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# https://github.com/penpot/penpot/issues/1533#issuecomment-1030005203
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# https://github.com/google/zopfli/issues/113
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--keepchunks=cHRM,gAMA,pHYs,iCCP,sRGB,oFFs,sTER
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# Since we have git behind our back, overwrite PNG files in-place (only
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# when result is smaller).
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-y
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)
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time find "$TARGET" -type f -iname '*.png' -exec zopflipng "${opts[@]}" {} {} \;
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echo "After"
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png_total_size
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