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#!/bin/sh
set -e
if [ $# -ne 2 ]; then
echo >&2 "Usage: $0 input.svg output.ico"
exit 1
fi
# For smooth rendering on high-DPI displays, the standard three app icon sizes
# (16x16, 32x32 and 48x48) have to be scaled to the four Windows DPI settings
# as in the table below:
# Small Regular Tiles
# 96 DPI (100%) 16x16 32x32 48x48
# 120 DPI (125%) 20x20 40x40 60x60
# 144 DPI (150%) 24x24 48x48 72x72
# 196 DPI (200%) 32x32 64x64 96x96
# Also, there should also be an extra large 256x256 icon and some low colour
# 8-bit and 4-bit variants, which are still used in Remote Desktop.
# Note: Windows Vista has a bug in its icon scaling that makes no sense.
# Instead of following the DPI setting, small icons are always a bit larger
# than they should be at 22x22, 26x26 and 36x36 for 120, 144 and 196 DPI. This
# script doesn't generate icons with those sizes, since computers with Vista
# and a high-DPI display are probably fairly rare these days.
temppng=".$(basename "$1" .svg)-temp.png"
inkscape --without-gui --export-png="$temppng" --export-dpi=72 \
--export-background-opacity=0 --export-width=512 --export-height=512 \
"$1" >/dev/null 2>&1
# Old versions of ImageMagick (like the one in Cygwin) use the wrong gamma when
# exporting icon files. To fix, add -gamma 2.2 after the input file.
convert png:"$temppng" -filter lanczos2 \
\( -clone 0 -resize 96x96 \) \
\( -clone 0 -resize 72x72 \) \
\( -clone 0 -resize 64x64 \) \
\( -clone 0 -resize 60x60 \) \
\( -clone 0 -resize 48x48 \) \
\( -clone 0 -resize 40x40 \) \
\( -clone 0 -resize 32x32 \) \
\( -clone 0 -resize 24x24 \) \
\( -clone 0 -resize 20x20 \) \
\( -clone 0 -resize 16x16 \) \
\( -clone 0 -resize 256x256 \) \
\( -clone 0 -resize 32x32 \( -clone 0 -alpha opaque -colors 255 \) \
\( -clone 0 -channel A -threshold 50% \) \
-delete 0 -compose CopyOpacity -composite -colors 256 \) \
\( -clone 0 -resize 16x16 \( -clone 0 -alpha opaque -colors 255 \) \
\( -clone 0 -channel A -threshold 50% \) \
-delete 0 -compose CopyOpacity -composite -colors 256 \) \
\( -clone 0 -resize 32x32 \( -clone 0 -alpha opaque -colors 15 \) \
\( -clone 0 -channel A -threshold 50% \) \
-delete 0 -compose CopyOpacity -composite -colors 16 \) \
\( -clone 0 -resize 16x16 \( -clone 0 -alpha opaque -colors 15 \) \
\( -clone 0 -channel A -threshold 50% \) \
-delete 0 -compose CopyOpacity -composite -colors 16 \) \
-delete 0 \
-define png:compression-level=9 -define png:include-chunk=none ico:"$2"
rm "$temppng"
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