Improve tray icon images (#1736)

scripts/icons/convert_and_pack.sh

@@ -0,0 +1,61 @@
+#!/bin/bash
+
+if ! [ -x "$(command -v ./go-png2ico)" ]; then
+    echo "./go-png2ico not found"
+    echo "download the executable from https://github.com/J-Siu/go-png2ico"
+    echo "and drop it in this folder"
+    exit 1
+fi
+
+if ! [ -x "$(command -v ./oxipng)" ]; then
+    echo "./oxipng executable not found"
+    echo "download the executable from https://github.com/shssoichiro/oxipng"
+    echo "and drop it in this folder"
+    exit 1
+fi
+
+if ! [ -x "$(command -v inkscape)" ]; then
+    echo "inkscape executable not found"
+    exit 1
+fi
+
+icon_base_sizes=(16 64)
+icon_sizes_keys=() # associative array to prevent duplicates
+icon_sizes_keys[256]=1
+
+for icon_base_size in ${icon_base_sizes[@]}; do
+    # increment in 25% till 400%
+    icon_size_increment=$((icon_base_size / 4))
+    for ((i = 0; i <= 12; i++)); do
+        icon_sizes_keys[$((icon_base_size + i * icon_size_increment))]=1
+    done
+done
+
+# convert to normal array
+icon_sizes=${!icon_sizes_keys[@]}
+
+echo "using icon sizes:"
+echo ${icon_sizes[@]}
+
+src_vectors=("../../src_assets/common/assets/web/images/sunshine-locked.svg"
+             "../../src_assets/common/assets/web/images/sunshine-pausing.svg"
+             "../../src_assets/common/assets/web/images/sunshine-playing.svg"
+             "../../sunshine.svg")
+
+echo "using sources vectors:"
+echo ${src_vectors[@]}
+
+for src_vector in ${src_vectors[@]}; do
+    file_name=`basename "$src_vector" .svg`
+    png_files=()
+    for icon_size in ${icon_sizes[@]}; do
+        png_file="${file_name}${icon_size}.png"
+        echo "converting ${png_file}"
+        inkscape -w $icon_size -h $icon_size "$src_vector" --export-filename "${png_file}" &&
+        ./oxipng -o max --strip safe --alpha "${png_file}" &&
+        png_files+=("${png_file}")
+    done
+
+    echo "packing ${file_name}.ico"
+    ./go-png2ico "${png_files[@]}" "${file_name}.ico"
+done