6aa5c53748
Sometimes scalable icons or icons within the thresholds from the desired resolutions aren't available. In this case it's still nicer to end up with a blocky scaled icon rather than the generic default.
199 lines
7.4 KiB
Bash
199 lines
7.4 KiB
Bash
#!/usr/bin/env bash
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fixupOutputHooks+=('convertDesktopFiles $prefix')
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# Get a param out of a desktop file. First parameter is the file and the second
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# is a pattern of the key who's value we should fetch.
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getDesktopParam() {
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local file="$1";
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local pattern="$2";
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awk -F "=" "/${pattern}/ {print \$2}" "${file}"
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}
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# Convert a freedesktop.org icon theme for a given app to a .icns file. When possible, missing
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# icons are synthesized from SVG or rescaled from existing ones (when within the size threshold).
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convertIconTheme() {
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local -r out=$1
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local -r sharePath=$2
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local -r iconName=$3
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local -r theme=${4:-hicolor}
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# Sizes based on archived Apple documentation:
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# https://developer.apple.com/design/human-interface-guidelines/macos/icons-and-images/app-icon#app-icon-sizes
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local -ra iconSizes=(16 32 128 256 512)
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local -ra scales=([1]="" [2]="@2")
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# Based loosely on the algorithm at:
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# https://specifications.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html#icon_lookup
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# Assumes threshold = 2 for ease of implementation.
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function findIcon() {
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local -r iconSize=$1
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local -r scale=$2
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local scaleSuffix=${scales[$scale]}
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local exactSize=${iconSize}x${iconSize}${scaleSuffix}
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local -a validSizes=(
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${exactSize}
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$((iconSize + 1))x$((iconSize + 1))${scaleSuffix}
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$((iconSize + 2))x$((iconSize + 2))${scaleSuffix}
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$((iconSize - 1))x$((iconSize - 1))${scaleSuffix}
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$((iconSize - 2))x$((iconSize - 2))${scaleSuffix}
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)
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for iconIndex in "${!candidateIcons[@]}"; do
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for maybeSize in "${validSizes[@]}"; do
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icon=${candidateIcons[$iconIndex]}
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if [[ $icon = */$maybeSize/* ]]; then
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if [[ $maybeSize = $exactSize ]]; then
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echo "fixed $icon"
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else
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echo "threshold $icon"
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fi
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elif [[ -a $icon ]]; then
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echo "fallback $icon"
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fi
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return 0
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done
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done
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echo "scalable"
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}
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function resizeIcon() {
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local -r in=$1
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local -r out=$2
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local -r iconSize=$3
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local -r scale=$4
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local density=$((72 * scale))x$((72 * scale))
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local dim=$((iconSize * scale))
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magick convert -scale "${dim}x${dim}" -density "$density" -units PixelsPerInch "$in" "$out"
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}
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function synthesizeIcon() {
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local -r in=$1
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local -r out=$2
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local -r iconSize=$3
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local -r scale=$4
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if [[ $in != '-' ]]; then
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local density=$((72 * scale))x$((72 * scale))
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local dim=$((iconSize * scale))
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rsvg-convert --keep-aspect-ratio --width "$dim" --height "$dim" "$in" --output "$out"
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magick convert -density "$density" -units PixelsPerInch "$out" "$out"
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else
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return 1
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fi
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}
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function getIcons() {
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local -r sharePath=$1
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local -r iconname=$2
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local -r theme=$3
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local -r resultdir=$(mktemp -d)
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local -ar candidateIcons=(
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"${sharePath}/icons/${theme}/"*"/${iconname}.png"
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"${sharePath}/icons/${theme}/"*"/${iconname}.xpm"
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)
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local -a scalableIcon=("${sharePath}/icons/${theme}/scalable/${iconname}.svg"*)
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if [[ ${#scalableIcon[@]} = 0 ]]; then
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scalableIcon=('-')
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fi
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# Tri-state variable, NONE means no icons have been found, an empty
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# icns file will be generated, not sure that's necessary because macOS
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# will default to a generic icon if no icon can be found.
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#
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# OTHER means an appropriate icon was found.
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#
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# Any other value is a path to an icon file that isn't scalable or
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# within the threshold. This is used as a fallback in case no better
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# icon can be found and will be scaled as much as
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# necessary to result in appropriate icon sizes.
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local foundIcon=NONE
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for iconSize in "${iconSizes[@]}"; do
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for scale in "${!scales[@]}"; do
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local iconResult=$(findIcon $iconSize $scale)
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local type=${iconResult%% *}
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local icon=${iconResult#* }
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local scaleSuffix=${scales[$scale]}
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local result=${resultdir}/${iconSize}x${iconSize}${scales[$scale]}${scaleSuffix:+x}.png
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case $type in
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fixed)
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local density=$((72 * scale))x$((72 * scale))
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magick convert -density "$density" -units PixelsPerInch "$icon" "$result"
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foundIcon=OTHER
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;;
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threshold)
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# Synthesize an icon of the exact size if a scalable icon is available
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# instead of scaling one and ending up with a fuzzy icon.
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if ! synthesizeIcon "${scalableIcon[0]}" "$result" "$iconSize" "$scale"; then
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resizeIcon "$icon" "$result" "$iconSize" "$scale"
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fi
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foundIcon=OTHER
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;;
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scalable)
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synthesizeIcon "${scalableIcon[0]}" "$result" "$iconSize" "$scale" || true
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foundIcon=OTHER
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;;
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fallback)
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# Use the largest size available to scale to
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# appropriate sizes.
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if [[ $foundIcon != OTHER ]]; then
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foundIcon=$icon
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fi
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;;
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*)
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;;
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esac
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done
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done
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if [[ $foundIcon != NONE && $foundIcon != OTHER ]]; then
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# Ideally we'd only resize to whatever the closest sizes are,
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# starting from whatever icon sizes are available.
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for iconSize in 16 32 128 256 512; do
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local result=${resultdir}/${iconSize}x${iconSize}.png
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resizeIcon "$foundIcon" "$result" "$iconSize" 1
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done
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fi
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echo "$resultdir"
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}
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iconsdir=$(getIcons "$sharePath" "apps/${iconName}" "$theme")
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if [[ -n "$(ls -1 "$iconsdir/"*)" ]]; then
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icnsutil compose --toc "$out/${iconName}.icns" "$iconsdir/"*
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else
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echo "Warning: no icons were found. Creating an empty icon for ${iconName}.icns."
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touch "$out/${iconName}.icns"
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fi
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}
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# For a given .desktop file, generate a darwin '.app' bundle for it.
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convertDesktopFile() {
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local -r file=$1
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local -r sharePath=$(dirname "$(dirname "$file")")
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local -r name=$(getDesktopParam "${file}" "^Name")
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local -r exec=$(getDesktopParam "${file}" "Exec")
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local -r iconName=$(getDesktopParam "${file}" "^Icon")
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local -r squircle=$(getDesktopParam "${file}" "X-macOS-SquircleIcon")
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mkdir -p "$out/Applications/${name}.app/Contents/MacOS"
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mkdir -p "$out/Applications/${name}.app/Contents/Resources"
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convertIconTheme "$out/Applications/${name}.app/Contents/Resources" "$sharePath" "$iconName"
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write-darwin-bundle "$out" "$name" "$exec" "$iconName" "$squircle"
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}
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convertDesktopFiles() {
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local dir="$1/share/applications/"
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if [ -d "${dir}" ]; then
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for desktopFile in $(find "$dir" -iname "*.desktop"); do
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convertDesktopFile "$desktopFile";
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done
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fi
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}
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