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dccc86ea62
Apple introduced a bug in macOS 11 that they can't be arsed to fix which breaks PNG loading into icns files by dropping the blue channel of the last pixel, leaving a streak of yellow pixels at the bottom of the image. This hacks around it by setting a fully transparent, non-white (actually yellow) pixel in the bottom-right corner of the images. This is such inexcusable trash.
80 lines
3.0 KiB
Bash
Executable File
80 lines
3.0 KiB
Bash
Executable File
#!/bin/bash
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# Invoked from cmake as mk-icns.sh /path/to/icon.svg /path/to/output.icns
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svg="$1"
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out="$2"
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outdir="${out/%.icns/.iconset}"
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set -e
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# Apple's PNG encoding/decoding is buggy and likes to inject yellow lines, particularly for the
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# smaller images. This is apparently a known issue since macOS 11 that apple just doesn't give a
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# shit about fixing (https://en.wikipedia.org/wiki/Apple_Icon_Image_format#Known_issues).
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#
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# So moral of the story: we have to arse around and edit the png to put a tranparent pixel in the
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# bottom-left corner but that pixel *must* be different from the preceeding color, otherwise Apple's
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# garbage breaks exposing the dumpster fire that lies beneath and drops the blue channel from the
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# last pixel (or run of pixels, if they are the same color (ignoring transparency). So, just to be
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# consistent, we make *all* 4 corners transparent yellow, because it seems unlikely for our logo to
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# have full-on yellow in the corner, and the color itself is irrelevant because it is fully
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# transparent.
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#
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# Why is there so much broken, buggy crap in the macOS core???
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no_r_kelly() {
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size=$1
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last=$((size - 1))
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for x in 0 $last; do
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for y in 0 $last; do
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echo -n "color $x,$y point "
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done
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done
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}
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mkdir -p "${outdir}"
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for size in 32 64 128 256 512 1024; do
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# Yay Apple thanks for this utter trash OS.
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last=$((size - 1))
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convert -background none -resize "${size}x${size}" "$svg" \
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-fill '#ff00' -draw "$(no_r_kelly $size)" \
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-strip "png32:${outdir}/icon_${size}x${size}.png"
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done
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# Outputs the imagemagick -draw command to color the corner-adjacent pixels as half-transparent
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# white. We use this for the 16x16 (the others pick up corner transparency from the svg).
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semitransparent_off_corners() {
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size=$1
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for x in 1 $((size - 2)); do
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for y in 0 $((size - 1)); do
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echo -n "color $x,$y point "
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done
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done
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for x in 0 $((size -1)); do
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for y in 1 $((size - 2)); do
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echo -n "color $x,$y point "
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done
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done
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}
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# For 16x16 we crop the image to 5/8 of its regular size before resizing which effectively zooms in
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# on it a bit because if we resize the full icon it ends up a fuzzy mess, while the crop and resize
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# lets us retain some detail of the logo. (We don't do this for the 16x16@2x because that is really
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# 32x32 where it retains enough detail).
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convert -background none -resize 512x512 "$svg" -gravity Center -extent 320x320 -resize 16x16 \
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-fill '#ff00' -draw "$(no_r_kelly 16)" \
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-fill '#fff8' -draw "$(semitransparent_off_corners 16)" \
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-strip "png32:$outdir/icon_16x16.png"
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# Create all the "@2x" versions which are just the double-size versions
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rm -f "${outdir}/icon_*@2x.png"
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mv "${outdir}/icon_1024x1024.png" "${outdir}/icon_512x512@2x.png"
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for size in 16 32 128 256; do
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double=$((size * 2))
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ln -f "${outdir}/icon_${double}x${double}.png" "${outdir}/icon_${size}x${size}@2x.png"
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done
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iconutil -c icns "${outdir}"
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