Add the script to convert pieces as reference

Author: veloce

scripts/convert_svgs_to_pngs.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+# This script converts all SVGs in the lila/public/piece folder to PNGs in the output folder using Inkscape.
+# Script taken from @tiagoamaro's PR: https://github.com/lichess-org/flutter-chessground/pull/28
+
+SOURCE_DIR="./lila/public/piece"
+DEST_DIR="./output"
+SCALING_FACTORS=("1 ." "2 ./2.0x" "3 ./3.0x" "4 ./4.0x")
+
+for dname in $(ls -d $SOURCE_DIR/*); do
+    if [ -d "$dname" ]; then
+        for factor_folder in "${SCALING_FACTORS[@]}"; do
+            read -r -a factor_folder_array <<< "$factor_folder"
+            factor=${factor_folder_array[0]}
+            folder=${factor_folder_array[1]}
+            for fname in $(ls $dname); do
+                fpath="$dname/$fname"
+                if [ -f "$fpath" ]; then
+                    out_folder="$DEST_DIR/${dname##*/}/$folder"
+                    echo $out_folder
+                    mkdir -p $out_folder
+                    fname_without_extension="${fname%.*}"
+                    png="$out_folder/$fname_without_extension.png"
+                    echo "Converting $fpath to $png"
+                    size=$((128 * factor))
+                    inkscape --export-type="png" --export-width="$size" --export-height="$size" --export-filename="$png" $fpath &
+                fi
+            done
+        done
+    fi
+done