#11453 add SVG to ICNS conversion utility

development/MacOSX/svn2icns.sh

@@ -0,0 +1,134 @@
+#! /bin/bash
+###
+### svg2icns.sh
+###   Create ICNS file from SVG
+###   https://gist.github.com/plroebuck/af19a26c908838c7f9e363c571199deb
+###
+### See also:
+###   <https://stackoverflow.com/questions/12306223/how-to-manually-create-icns-files-using-iconutil#39678276>
+###   <https://developer.apple.com/library/content/documentation/GraphicsAnimation/Conceptual/HighResolutionOSX/Optimizing/Optimizing.html>
+###
+
+script="$(basename $0 .sh)"
+
+PATH=/Applications/Inkscape.app/Contents/MacOS:/Applications/Inkscape.app/Contents/Resources/bin:"$PATH"
+
+CONVERT_BIN=$(which inkscape)
+: ${CONVERT_BIN?Requires Inkscape to be installed}
+
+## Usage function
+usage() {
+    cat <<END_USAGE >&2
+Usage: ${script} <svgfilename> [<icnsfilename>]
+  svgfilename:  input file in SVG format
+  icnsfilename: output file in ICNS format (optional)
+
+END_USAGE
+}
+ 
+## Call usage() function if args not supplied
+argc="$#"
+if [[ "$argc" -lt 1 ]] || [[ "$argc" -gt 2 ]];
+then
+    usage
+    exit 1
+fi
+
+## Verify first positional argument
+svgfilename="$1"
+if [ ! -f "${svgfilename}" ];
+then
+    usage
+    echo "${script}: no such file: ${svgfilename}" >&2
+    exit 1
+else
+    ## Verify scalable vector graphics file
+    $(file "${svgfilename}" | cut -d':' -f2- | grep -qs 'SVG')
+    if [ "$?" -ne 0 ];
+    then
+        usage
+        echo "${script}: SVG file required: ${svgfilename}" >&2
+        exit 1
+    fi
+fi
+
+## Verify second positional argument if given
+if [ "$argc" -eq 2 ];
+then
+    icnsfilename="$2"
+    if [ -n "${icnsfilename}" ];
+    then
+        ## Ensure file extension
+        ext=${icnsfilename##*.}
+        if [ "$ext" != "icns" ];
+        then
+            icnsfilename="${icnsfilename}.icns"
+        fi
+    else
+        ## Given empty string as second arg
+        icnsfilename="${svgfilename%.*}.icns"
+    fi
+else
+    ## No second arg
+    icnsfilename="${svgfilename%.*}.icns"
+fi
+
+## Create iconset directory if necessary
+iconsetdirname=/tmp/$(basename "${icnsfilename}" .icns)-$$.iconset
+mkdir -p "${iconsetdirname}"
+
+##+---------------------+--------------------+--------------+
+##|      filename       | resolution, pixels | density, PPI |
+##+---------------------+--------------------+--------------+
+##| icon_16x16.png      | 16x16              |           72 |
+##| icon_16x16@2x.png   | 32x32              |          144 |
+##| icon_32x32.png      | 32x32              |           72 |
+##| icon_32x32@2x.png   | 64x64              |          144 |
+##| icon_128x128.png    | 128x128            |           72 |
+##| icon_128x128@2x.png | 256x256            |          144 |
+##| icon_256x256.png    | 256x256            |           72 |
+##| icon_256x256@2x.png | 512x512            |          144 |
+##| icon_512x512.png    | 512x512            |           72 |
+##| icon_512x512@2x.png | 1024x1024          |          144 |
+##+---------------------+--------------------+--------------+
+
+## Create PNG files as described in table
+sizes=( 16 32 128 256 512 )
+densities=( 72 144 )
+
+for size in "${sizes[@]}"
+do
+    dimen="${size}x${size}"
+    for density in "${densities[@]}"
+    do
+        if [ "${density}" == "72" ];
+        then
+            ## std
+            resolution="${dimen}"
+            scale=""
+        else
+            ## hires
+            resolution="$(( $size * 2 ))x$(( $size * 2 ))"
+            scale="@2x"
+        fi
+        pngfilename="${iconsetdirname}/icon_${dimen}${scale}.png"
+		  inkscape --export-type=png -w $size -h $size -o "${pngfilename}" "${svgfilename}"
+        if [ "$?" -ne 0 ];
+        then
+            echo "${script}: error creating icon file: ${pngfilename}" >&2
+            exit 1
+        fi
+    done
+done
+
+## Convert iconset to ICNS file
+iconutil --convert icns --output "${icnsfilename}" "${iconsetdirname}"
+if [ "$?" -ne 0 ];
+then
+    echo "${script}: error converting iconset to ICNS: ${iconsetdirname}" >&2
+    exit 1
+else
+    rm -rf "${iconsetdirname}"
+fi
+
+exit 0