Class: FaviconMaker::Generator

Inherits:
Object
  • Object
show all
Defined in:
lib/favicon_maker/generator.rb

Constant Summary collapse

ICON_VERSIONS = 
{
  :apple_144 => {:filename => "apple-touch-icon-144x144-precomposed.png", :sizes => "144x144", :format => "png"},
  :apple_120 => {:filename => "apple-touch-icon-120x120-precomposed.png", :sizes => "120x120", :format => "png"},
  :apple_114 => {:filename => "apple-touch-icon-114x114-precomposed.png", :sizes => "114x114", :format => "png"},
  :apple_72 => {:filename => "apple-touch-icon-72x72-precomposed.png", :sizes => "72x72", :format => "png"},
  :apple_57 => {:filename => "apple-touch-icon-57x57-precomposed.png", :sizes => "57x57", :format => "png"},
  :apple_pre => {:filename => "apple-touch-icon-precomposed.png", :sizes => "57x57", :format => "png"},
  :apple => {:filename => "apple-touch-icon.png", :sizes => "57x57", :format => "png"},
  :fav_png => {:filename => "favicon.png", :sizes => "16x16", :format => "png"},
  :fav_ico => {:filename => "favicon.ico", :sizes => "64x64,32x32,24x24,16x16", :format => "ico"}
}
IM_VERSION = 
(`convert --version`).scan(/ImageMagick (\d\.\d\.\d)/).flatten.first
RECENT_VERSION = 
"6.8.0"
COLORSPACE_MIN_VERSION = 
"6.7.5"

Class Method Summary collapse

Class Method Details

.create_versions(options = {}, &block) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/favicon_maker/generator.rb', line 25

def create_versions(options={}, &block)

  puts "FaviconMaker: WARNING! Your installed ImageMagick version #{IM_VERSION} is not up-to-date and might produce suboptimal output!" if IM_VERSION < RECENT_VERSION

  switch_colorspace = IM_VERSION < COLORSPACE_MIN_VERSION

  colorspace_conv = ["RGB", "sRGB"]
  colorspace_conv.reverse! if switch_colorspace

  is_windows = (RbConfig::CONFIG['host_os'].match /mswin|mingw|cygwin/)

  options = {
    :versions => ICON_VERSIONS.keys,
    :custom_versions => {},
    :root_dir => File.dirname(__FILE__),
    :input_dir => "favicons",
    :base_image => "favicon_base.png",
    :output_dir => "favicons_output",
    :copy => false
  }.merge(options)

  raise ArgumentError unless options[:versions].is_a? Array
  base_path = File.join(options[:root_dir], options[:input_dir])
  input_file = File.join(base_path, options[:base_image])

  icon_versions = ICON_VERSIONS.merge(options[:custom_versions])
  (options[:versions] + options[:custom_versions].keys).uniq.each do |version|
    version = icon_versions[version]
    sizes = version[:dimensions] || version[:sizes]
    composed_path = File.join(base_path, version[:filename])
    output_path = File.join(options[:root_dir], options[:output_dir])
    output_file = File.join(output_path, version[:filename])

    build_mode = nil
    # check for self composed icon file
    if File.exist?(composed_path) && options[:copy]
      FileUtils.cp composed_path, output_file
      build_mode = :copied
    else
      case version[:format].to_sym
      when :png
        image = MiniMagick::Image.open(input_file)
        image.define "png:include-chunk=none,trns,gama"
        image.colorspace colorspace_conv.first
        image.resize sizes
        image.format "png"
        image.strip
        image.colorspace colorspace_conv.last
        image.write output_file
      when :ico
        ico_cmd = "convert \"#{input_file}\" -colorspace #{colorspace_conv.first} "
        escapes = "\\" unless is_windows
        sizes.split(',').sort_by{|s| s.split('x')[0].to_i}.each do |size|
          ico_cmd << "#{escapes}( -clone 0 -colors 256 -resize #{size} #{escapes}) "
        end
        ico_cmd << "-delete 0 -colors 256 -colorspace #{colorspace_conv.last} \"#{File.join(output_path, version[:filename])}\""
        puts `#{ico_cmd}`
      end
      build_mode = :generated
    end

    if block_given?
      yield output_file, build_mode
    end
  end
end