mirror of
https://github.com/scratchfoundation/scratch-link.git
synced 2024-11-14 19:05:03 -05:00
73 lines
2.4 KiB
Bash
73 lines
2.4 KiB
Bash
#!/usr/bin/env bash
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usage () {
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echo "Usage: svg-convert input.svg output.png width height DPI"
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echo "Usage: svg-convert input.svg output.ico size1 [size2 [size3 [...]]]"
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echo "Convert an SVG into a PNG or ICO"
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echo "Assumes the input SVG is square and that pixel [1,1] is a good background color"
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echo "PNG conversion:"
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echo " Pads the output horizontally, using the background color, to match the requested size"
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echo " The resulting PNG is optimized using optipng"
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echo "ICO conversion:"
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echo " Assumes each desired size is square"
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echo " Sizes above 256 may not be supported"
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echo " List sizes in decreasing order to make sure the largest suitable icon size is used in every context"
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echo " Repeats PNG conversion once per desired size, then glues the results together into an ICO file"
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echo " PNG optimizations are performed in parallel so progress reporting will likely be garbled"
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}
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if [ -z "$3" ]; then
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usage
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exit 1
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fi
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set -e
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INPUT_SVG="$1"
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shift 1
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# DISPLAY="" prevents 'convert' from trying to contact an X server, which can slow it down quite a bit.
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# This might cause problems if the SVG contains text but does not embed the necessary font(s).
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echo "Detecting border color..."
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BORDER_COLOR=$(DISPLAY="" convert -background none -format '%[pixel:u.p{1,1}]' "${INPUT_SVG}" info:)
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echo "Detected border color: ${BORDER_COLOR}"
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# Usage: svg2png output.png width height DPI
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svg2png () {
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OUTPUT_PNG="$1"
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PNG_WIDTH="$2"
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PNG_HEIGHT="$3"
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PNG_DPI="$4"
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set -x
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cairosvg --output-height "${PNG_HEIGHT}" -f png -o - "${INPUT_SVG}" |
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DISPLAY="" convert -background "${BORDER_COLOR}" -gravity center -extent "${PNG_WIDTH}x${PNG_HEIGHT}" -density "${PNG_DPI}" - "${OUTPUT_PNG}"
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optipng -o7 -zm1-9 "$OUTPUT_PNG"
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}
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# Usage: svg2ico output.ico sizes...
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svg2ico () {
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set -e
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OUTPUT_ICO="$1"
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shift
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SVG2ICO_TMP=$(mktemp -d -t svg2ico-XXXXXXXXXX)
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trap 'echo "Cleaning up..." >&2; rm -rv "${SVG2ICO_TMP}"; exit' EXIT HUP INT TERM
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ICO_IMAGES=()
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for SIZE in "$@"; do
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ICO_PNG="${SVG2ICO_TMP}/icon-${SIZE}.png"
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ICO_IMAGES+=("${ICO_PNG}")
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svg2png "${ICO_PNG}" "${SIZE}" "${SIZE}" 96 &
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done
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wait # for all PNGs to be created and optimized
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(set -x && DISPLAY="" convert "${ICO_IMAGES[@]}" "${OUTPUT_ICO}")
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}
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# $1 = output file
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if [[ "${1}" =~ \.[Pp][Nn][Gg] ]]; then
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svg2png "$@"
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elif [[ "${1}" =~ \.[Ii][Cc][Oo] ]]; then
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svg2ico "$@"
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else
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echo "Unknown output file type: ${1}"
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usage
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exit 2
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fi
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