Module: VivlioStarter::CLI::PreProcessCommands::ImageGenerator

Defined in:
lib/vivlio_starter/cli/pre_process/image_generator.rb

Overview

テーマ画像バリアント生成モジュール

Constant Summary collapse

DEFAULT_WAIFU2X_BIN = 
File.expand_path('~/.local/bin/waifu2x/waifu2x-ncnn-vulkan')
FRONTISPIECE_WAIFU2X_NOISE = 
1
FRONTISPIECE_SCALE = 
2
FRONTISPIECE_TARGET_WIDTH =

frontispiece推奨横幅

2880
FRONTISPIECE_WEBP_QUALITY = 
90

Class Method Summary collapse

Class Method Details

.command_available?(cmd) ⇒ Boolean

コマンドが利用可能かチェック

Returns:

  • (Boolean) 


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# File 'lib/vivlio_starter/cli/pre_process/image_generator.rb', line 134

def command_available?(cmd)
  return File.executable?(cmd) if cmd.include?(File::SEPARATOR)

  ENV.fetch('PATH', '').split(File::PATH_SEPARATOR).any? do |path|
    candidate = File.join(path, cmd)
    File.executable?(candidate)
  end
end

.convert_to_webp(source_path, target_path, target_width:, webp_quality:, label:) ⇒ Object

画像（PNG 等）を最終的な WebP（透過・指定幅・品質）へ変換して target_path に書き出す



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# File 'lib/vivlio_starter/cli/pre_process/image_generator.rb', line 297

def convert_to_webp(source_path, target_path, target_width:, webp_quality:, label:)
  convert_cmd = [
    'magick', source_path,
    '-alpha', 'set',
    '-background', 'none',
    '-transparent', 'white',
    '-resize', "#{target_width}x",
    '-quality', webp_quality.to_s,
    target_path
  ]
  run_command!(convert_cmd, label: "WebP 変換 (#{label})")
end

.ensure_magick_available! ⇒ Object

ImageMagick が利用可能かチェック



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# File 'lib/vivlio_starter/cli/pre_process/image_generator.rb', line 126

def ensure_magick_available!
  _out, status = Open3.capture2('magick', '-version')
  raise 'ImageMagick (magick) が見つかりません。インストールを確認してください。' unless status.success?
rescue Errno::ENOENT
  raise 'magick コマンドが見つかりません。ImageMagick をインストールしてください。'
end

.ensure_variant_generated(source_path, variant) ⇒ Object

バリアント画像が存在しなければ生成。 生成物はソースの隣ではなく生成キャッシュ .cache/vs/theme-images/ へ （images root からの相対サブパスを維持・generated-assets 移設仕様 §2）。 waifu2x を伴う高コスト処理のため、生成済みチェックが実質のメモ化になる。



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# File 'lib/vivlio_starter/cli/pre_process/image_generator.rb', line 56

def ensure_variant_generated(source_path, variant)
  images_root = ThemeImageResolver.theme_images_root
  relative = source_path.sub(%r{\A#{Regexp.escape(images_root)}/}, '')
  return nil if relative.empty?

  base = relative.sub(/\.[^.]+\z/, '')
  target = File.join(ThemeImageResolver.theme_images_cache_root, "#{base}_#{variant}.webp")
  return target if File.exist?(target)

  success = generate_frontispiece_and_ornament_from(relative)
  success ? target : nil
end

.frontispiece_variants ⇒ Object 



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# File 'lib/vivlio_starter/cli/pre_process/image_generator.rb', line 44

def frontispiece_variants
  portrait_ratio = ThemeImageResolver.binding_safe_portrait_ratio
  {
    portrait: portrait_ratio,
    landscape: (1.0 / 2.39) # ornament用 2.39:1（シネマスコープ）
  }
end

.generate_diagonal_variant(input_png, output_png, ratio) ⇒ Object

対角線分割バリアントを生成



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# File 'lib/vivlio_starter/cli/pre_process/image_generator.rb', line 185

def generate_diagonal_variant(input_png, output_png, ratio)
  dims, status = Open3.capture2('magick', 'identify', '-format', '%w %h', input_png)
  raise "寸法取得に失敗しました: #{input_png}" unless status.success?

  width_str, height_str = dims.strip.split
  width = width_str.to_i
  height = height_str.to_i
  raise "不正な寸法です: #{input_png}" if width <= 0 || height <= 0

  ratio = ratio.to_f
  current_ratio = height.to_f / width
  if ratio >= current_ratio
    new_width = width
    new_height = (width * ratio).round
    bottom_x_offset = 0
    bottom_y_offset = new_height - height
  else
    new_height = height
    new_width = (height / ratio).round
    bottom_x_offset = new_width - width
    bottom_y_offset = 0
  end

  top_path = output_png.sub(/\.png\z/, '_top.png')
  bottom_path = output_png.sub(/\.png\z/, '_bottom.png')

  top_cmd = [
    'magick', input_png,
    '-background', 'white', '-flatten',
    '(', '-size', "#{width}x#{height}", 'xc:none', '-fill', 'white', '-draw', "polygon 0,0 #{width},0 0,#{height}", ')',
    '-compose', 'CopyAlpha', '-composite', "PNG32:#{top_path}"
  ]
  bottom_cmd = [
    'magick', input_png,
    '-background', 'white', '-flatten',
    '(', '-size', "#{width}x#{height}", 'xc:none', '-fill', 'white', '-draw', "polygon #{width},#{height} #{width},0 0,#{height}", ')',
    '-compose', 'CopyAlpha', '-composite', "PNG32:#{bottom_path}"
  ]
  composite_cmd = [
    'magick',
    '-size', "#{new_width}x#{new_height}",
    'xc:white',
    '-alpha', 'set',
    '+repage',
    top_path, '-geometry', '+0+0', '-compose', 'Over', '-composite',
    bottom_path, '-geometry', "+#{bottom_x_offset}+#{bottom_y_offset}", '-compose', 'Over', '-composite',
    '-transparent', 'white',
    "PNG32:#{output_png}"
  ]

  run_command!(top_cmd, label: '対角線分割 (上)')
  run_command!(bottom_cmd, label: '対角線分割 (下)')
  run_command!(composite_cmd, label: '対角線分割 (合成)')
ensure
  FileUtils.rm_f(top_path)
  FileUtils.rm_f(bottom_path)
end

.generate_frontispiece_and_ornament_from(image_spec, fuzz: nil, waifu2x: DEFAULT_WAIFU2X_BIN, waifu2x_args: [], waifu2x_noise: FRONTISPIECE_WAIFU2X_NOISE, scale: FRONTISPIECE_SCALE, target_width: FRONTISPIECE_TARGET_WIDTH, webp_quality: FRONTISPIECE_WEBP_QUALITY, keep_intermediate: false) ⇒ Object

frontispiece と ornament を生成



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# File 'lib/vivlio_starter/cli/pre_process/image_generator.rb', line 70

def generate_frontispiece_and_ornament_from(image_spec, fuzz: nil, waifu2x: DEFAULT_WAIFU2X_BIN,
                                            waifu2x_args: [], waifu2x_noise: FRONTISPIECE_WAIFU2X_NOISE,
                                            scale: FRONTISPIECE_SCALE, target_width: FRONTISPIECE_TARGET_WIDTH,
                                            webp_quality: FRONTISPIECE_WEBP_QUALITY, keep_intermediate: false)
  ensure_magick_available!

  images_root = File.join(Common::STYLESHEETS_DIR, 'images')
  source_path = resolve_image_reference(images_root, image_spec)
  basename = File.basename(source_path, '.*')

  # 出力先はソースの隣ではなく生成キャッシュ（相対サブパス維持・移設仕様 §2）。
  # bundled/sakura.webp → theme-images/bundled/、myphoto.png → theme-images/ 直下。
  relative_dir = File.dirname(
    File.expand_path(source_path).delete_prefix("#{File.expand_path(images_root)}/")
  )
  base_dir = File.join(ThemeImageResolver.theme_images_cache_root, relative_dir == '.' ? '' : relative_dir)

  Common.log_action("frontispiece/ornament 生成: #{image_spec} → #{basename}_portrait/landscape.webp")

  waifu2x_available = waifu2x && !waifu2x.strip.empty? && command_available?(waifu2x)
  Common.log_warn("waifu2x (#{waifu2x}) が見つかりません。ImageMagick のみで生成します。") unless waifu2x_available

  Dir.mktmpdir('frontispiece-one') do |tmpdir|
    trimmed_path = File.join(tmpdir, "#{basename}_trimmed.png")
    trim_image_to(source_path, trimmed_path, fuzz)

    frontispiece_variants.each do |variant, ratio|
      variant_png = File.join(tmpdir, "#{basename}_#{variant}.png")
      generate_diagonal_variant(trimmed_path, variant_png, ratio)

      target_path = File.join(base_dir, "#{basename}_#{variant}.webp")
      generate_variant_output(
        variant_png,
        target_path,
        variant: variant,
        waifu2x_available: waifu2x_available,
        waifu2x: waifu2x,
        waifu2x_args: waifu2x_args,
        waifu2x_noise: waifu2x_noise,
        scale: scale,
        target_width: target_width,
        webp_quality: webp_quality,
        keep_intermediate: keep_intermediate
      )

      Common.log_success("生成しました: #{target_path}")
    end
  end

  true
rescue StandardError => e
  Common.log_error("frontispiece/ornament 生成に失敗しました: #{e.message}")
  false
end

.generate_variant_output(input_png, target_path, variant:, waifu2x_available:, waifu2x:, waifu2x_args:, waifu2x_noise:, scale:, target_width:, webp_quality:, keep_intermediate:) ⇒ Object

バリアント出力を生成 rubocop:disable Lint/UnusedMethodArgument



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# File 'lib/vivlio_starter/cli/pre_process/image_generator.rb', line 245

def generate_variant_output(input_png, target_path, variant:, waifu2x_available:, waifu2x:, waifu2x_args:,
                            waifu2x_noise:, scale:, target_width:, webp_quality:, keep_intermediate:)
  # rubocop:enable Lint/UnusedMethodArgument
  FileUtils.mkdir_p(File.dirname(target_path))

  variant_label = File.basename(target_path)

  unless waifu2x_available
    convert_to_webp(input_png, target_path, target_width:, webp_quality:, label: variant_label)
    return
  end

  # waifu2x 経路: アルファ抽出 → waifu2x 拡大 → アルファ拡大 → 再合成 の中間 PNG は
  # tmpdir に隔離する。base_dir（bundled/）へ書かないため、途中で例外が起きても
  # ブロック離脱で自動削除され、bundled/ に中間生成物が残らない。
  Dir.mktmpdir('frontispiece-variant') do |tmpdir|
    stem              = File.join(tmpdir, File.basename(target_path, '.webp'))
    alpha_path        = "#{stem}_alpha.png"
    alpha_scaled_path = "#{stem}_alpha_x#{scale}.png"
    color_path        = "#{stem}_color_x#{scale}.png"
    merged_path       = "#{stem}_merged_x#{scale}.png"

    run_command!(
      ['magick', input_png, '-alpha', 'extract', "PNG32:#{alpha_path}"],
      label: "アルファ抽出 (#{variant_label})"
    )

    waifu_cmd = [waifu2x, '-i', input_png, '-o', color_path, '-n', waifu2x_noise.to_s, '-s',
                 scale.to_s] + waifu2x_args
    run_command!(
      waifu_cmd,
      label: "waifu2x (#{variant_label})",
      stream_output: Common.current_log_level >= 3
    )

    scale_percent = format('%.2f%%', scale.to_f * 100)
    run_command!(
      ['magick', alpha_path, '-filter', 'catrom', '-resize', scale_percent, "PNG32:#{alpha_scaled_path}"],
      label: "アルファ拡大 (#{variant_label})"
    )

    run_command!(
      ['magick', color_path, alpha_scaled_path, '-compose', 'CopyAlpha', '-composite',
       "PNG32:#{merged_path}"],
      label: "アルファ再適用 (#{variant_label})"
    )

    convert_to_webp(merged_path, target_path, target_width:, webp_quality:, label: variant_label)
  end
end

.resolve_image_reference(images_root, image_spec) ⇒ Object

画像参照を解決



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# File 'lib/vivlio_starter/cli/pre_process/image_generator.rb', line 144

def resolve_image_reference(images_root, image_spec)
  spec = image_spec.to_s.strip
  raise '画像指定が空です' if spec.empty?

  normalized_root = File.expand_path(images_root)
  base_dir = normalized_root.end_with?(File::SEPARATOR) ? normalized_root : normalized_root + File::SEPARATOR
  relative = spec.sub(%r{^/+}, '')
  absolute = File.expand_path(relative, base_dir)

  unless absolute == normalized_root || absolute.start_with?(normalized_root + File::SEPARATOR)
    raise "画像指定が不正です: #{spec}"
  end

  return absolute if File.exist?(absolute)

  if File.extname(relative).empty?
    %w[.webp .png .jpg .jpeg].each do |ext|
      candidate = absolute + ext
      return candidate if File.exist?(candidate)
    end
  else
    stem = absolute.sub(/\.[^.]+\z/, '')
    exts = %w[.webp .png .jpg .jpeg]
    ([absolute] + exts.map { |ext| "#{stem}#{ext}" }).each do |candidate|
      return candidate if File.exist?(candidate)
    end
  end

  raise "画像が見つかりません: #{spec}"
end

.run_command!(cmd, label:, stream_output: false) ⇒ Object

コマンドを実行



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# File 'lib/vivlio_starter/cli/pre_process/image_generator.rb', line 311

def run_command!(cmd, label:, stream_output: false)
  Common.log_action("  $ #{Shellwords.join(cmd.map(&:to_s))}")

  if stream_output
    # stderr は常に /dev/null へ捨てる（waifu2x-ncnn-vulkan 等のデバイス情報ログを抑制）
    success = system(*cmd, err: File::NULL)
    raise "#{label} に失敗しました" unless success

    return
  end

  # stderr は /dev/null へ捨てる。エラー時のみ再取得して報告する
  stdout_str, status = Open3.capture2(*cmd, err: File::NULL)

  if status.success?
    if Common.current_log_level >= 3 && stdout_str && !stdout_str.strip.empty?
      stdout_str.each_line { |line| Common.log_debug("#{label}: #{line.rstrip}") }
    end
    return
  end

  # 失敗時は stderr も取得してエラーメッセージに含める
  _out, stderr_str, = Open3.capture3(*cmd)
  combined = [stdout_str, stderr_str].map(&:to_s).reject(&:empty?).join("\n")
  message = combined.empty? ? "#{label} に失敗しました" : "#{label} に失敗しました:\n#{combined}"
  raise message
end

.trim_image_to(source_path, destination_path, fuzz) ⇒ Object

画像をトリミング



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# File 'lib/vivlio_starter/cli/pre_process/image_generator.rb', line 176

def trim_image_to(source_path, destination_path, fuzz)
  FileUtils.mkdir_p(File.dirname(destination_path))
  command = ['magick', source_path, '-alpha', 'set']
  command += ['-fuzz', fuzz] if fuzz
  command += ['-bordercolor', 'none', '-border', '1x1', '-trim', '+repage', "PNG32:#{destination_path}"]
  run_command!(command, label: "トリミング (#{File.basename(source_path)})")
end