build_images.sh

#! /bin/bash

# Check dependencies
command -v inkscape >/dev/null 2>&1 || { echo >&2 "I require inkscape but it's not installed. Aborting."; exit 1; }
command -v scour >/dev/null 2>&1 || { echo >&2 "I require scour but it's not installed. Aborting."; exit 1; }
command -v optipng >/dev/null 2>&1 || { echo >&2 "I require optipng but it's not installed. Aborting."; exit 1; }
command -v convert >/dev/null 2>&1 || { echo >&2 "I require convert (imagemagick) but it's not installed. Aborting."; exit 1; }

CURRENT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"
BASE_DIR="$(dirname "${CURRENT_DIR}")"

CONVERT_OPTIONS="-alpha off +dither -colors 256 -depth 4"
OPTIPNG_OPTIONS="-preserve -quiet -o7"

# optimize svg
function optimize_svg() {
  SOURCE="$1"

  cp ${SOURCE} ${SOURCE}.tmp
  scour \
      --remove-descriptive-elements \
      --enable-id-stripping \
      --enable-viewboxing \
      --enable-comment-stripping \
      --nindent=4 \
      -i ${SOURCE}.tmp \
      -o ${SOURCE}
  rm ${SOURCE}.tmp
}

# build image
function build_image() {
  SOURCE="$1"
  TARGET_PNG="$2"
  IMAGE_WIDTH="$3"
  IMAGE_HEIGHT="$4"

  inkscape \
      --export-width=${IMAGE_WIDTH} \
      --export-height=${IMAGE_HEIGHT} \
      --export-filename=${TARGET_PNG} \
      ${SOURCE}
}

# optimize image
function optimize_image() {
  IMAGE_FILE="$1"

  convert "${IMAGE_FILE}" ${CONVERT_OPTIONS} "${IMAGE_FILE}"
  optipng ${OPTIPNG_OPTIONS} ${IMAGE_FILE}
}

# build menu image
function build_menu_image() {
  IMAGE_NAME="$1"

  INPUT_SVG="${CURRENT_DIR}/menu/${IMAGE_NAME}.svg"
  OUTPUT_PNG="${BASE_DIR}/assets/menu/${IMAGE_NAME}.png"

  optimize_svg "${INPUT_SVG}"
  build_image "${INPUT_SVG}" "${OUTPUT_PNG}" 640 640
  optimize_image "${OUTPUT_PNG}"
}


build_menu_image "game-pick-image"
build_menu_image "game-pick-word"