A script to convert the fonts

.gitignore

@@ -1,2 +1,3 @@
 *.mpq
 /build/
+/tmp/

convert-fonts.sh

@@ -0,0 +1,145 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+# Requires `idiffs` from the `openimageio-tools` package.
+# In your home directory, run:
+# git clone https://github.com/diasurgical/devilutionx-font-converter.git
+readonly DEVILUTIONX_FONT_CONVERTER_PATH="${HOME}/devilutionx-font-converter"
+
+# The base language to use for CJK fonts.
+# This should be the language that has the most identical output files
+# in common with other CJK locales.
+readonly BASE_CJK_LANG=ja
+
+readonly OUT_DIR=tmp/out
+
+# For debugging
+readonly KEEP_PNG=0
+
+declare -ra FONT_PARAMS=(
+  # font_filename_prefix font_size frame_height bevel_size supersampling
+  12:17:20:1:2
+  24:24:32:1:2
+  30:30:38:1:2
+  42:42:54:2:2
+  46:46:64:2.5:2
+)
+
+check_deps() {
+  if ! which idiff > /dev/null; then
+    echo >&2 "Missing idiff. On Debian/Ubuntu, run: "
+    echo >&2 "  sudo apt install openimageio-tools"
+    exit 1
+  fi
+  if [[ ! -d "$DEVILUTIONX_FONT_CONVERTER_PATH" ]]; then
+    echo >&2 "Missing $DEVILUTIONX_FONT_CONVERTER_PATH. Run: "
+    echo >&2 "  git clone https://github.com/diasurgical/devilutionx-font-converter.git ~/devilutionx-font-converter"
+    exit 1
+  fi
+}
+
+maybe_dl() {
+  local -r url="$1"
+  local -r filename="${url##*/}"
+  if [[ ! -f "tmp/dl/${filename}" ]]; then
+    set -x
+    curl -L --output "tmp/dl/${filename}" --create-dirs --progress-bar "$1"
+    { set +x; } 2> /dev/null
+
+    # If filename ends with ".zip", decompress the archive:
+    if [[ "${filename}" == *.zip ]]; then
+      set -x
+      unzip -o "tmp/dl/${filename}" -d "tmp/dl/"
+      { set +x; } 2> /dev/null
+    fi
+  fi
+}
+
+download_fonts() {
+  maybe_dl https://github.com/notofonts/noto-cjk/releases/download/Sans2.004/06_NotoSansCJKjp.zip
+  maybe_dl https://github.com/notofonts/noto-cjk/releases/download/Sans2.004/07_NotoSansCJKkr.zip
+  maybe_dl https://github.com/notofonts/noto-cjk/releases/download/Sans2.004/08_NotoSansCJKsc.zip
+  maybe_dl https://github.com/notofonts/noto-cjk/releases/download/Sans2.004/09_NotoSansCJKtc.zip
+
+  # We don't have a Cantonese translation yet, so skip converting Cantonese fonts for now.
+  # maybe_dl https://github.com/notofonts/noto-cjk/releases/download/Sans2.004/10_NotoSansCJKhk.zip
+}
+
+dfc() {
+  set -x
+  uv --directory="$DEVILUTIONX_FONT_CONVERTER_PATH" run devilutionx-font-converter "$@"
+  { set +x; } 2> /dev/null
+}
+
+convert_cjk() {
+  local -r lang="$1"
+  local -r font_path="$2"
+  local out_dir
+  if [[ "$lang" == "$BASE_CJK_LANG" ]]; then
+    out_dir="$OUT_DIR"
+  else
+    out_dir="${OUT_DIR}/${1}"
+  fi
+  mkdir -p "$out_dir"
+
+  for params_str in "${FONT_PARAMS[@]}"; do
+    IFS=':' read -r font_filename_prefix font_size frame_height bevel_size supersampling <<< "${params_str}"
+    dfc \
+      --font_path "${PWD}/${font_path}" \
+      --output_directory="${PWD}/${out_dir}" \
+      --output_basename_prefix="$font_filename_prefix" \
+      --save_png \
+      --font_size="$font_size" \
+      --frame_height="$frame_height" \
+      --min_cp=0x4e00 \
+      --max_cp=0xff00 \
+      --outer_bevel_size="$bevel_size" \
+      --supersampling="$supersampling"
+    if [[ "$lang" != "$BASE_CJK_LANG" ]]; then
+      rm_duplicate_files "$out_dir" "$font_filename_prefix"
+      if (( KEEP_PNG == 0 )); then
+        rm "$out_dir"/*.png
+      fi
+    fi
+  done
+}
+
+rm_duplicate_files() {
+  local -r out_dir="$1"
+  local -r prefix="$2"
+  cd "$out_dir"
+  local -a to_remove=()
+  for f in "$prefix"-*.pcx; do
+    if cmp -s "$f" ../"${f}" || \
+       idiff -q -fail 0.87 "${f%.pcx}.png" "../${f%.pcx}.png" 2>/dev/null; then
+      to_remove+=(
+        "$f"
+        "${f%.pcx}.txt"
+      )
+    fi
+  done
+  if (( ${#to_remove[@]} )); then
+    set -x
+    rm -f "${to_remove[@]}"
+    { set +x; } 2> /dev/null
+  fi
+  cd -
+}
+
+main() {
+  check_deps
+  download_fonts
+
+  # The "$BASE_CJK_LANG" must be converted first.
+  convert_cjk ja tmp/dl/NotoSansCJKjp-Regular.otf
+  convert_cjk ko tmp/dl/NotoSansCJKkr-Regular.otf
+  convert_cjk zh_CN tmp/dl/NotoSansCJKsc-Regular.otf
+  convert_cjk zh_TW tmp/dl/NotoSansCJKtc-Regular.otf
+
+  if (( KEEP_PNG == 0 )); then
+    rm "$OUT_DIR"/*.png
+  fi
+}
+
+main "$@"