Contents

# frozen_string_literal: true

require 'gdk_pixbuf2'

module Morandi
  # ProfiledPixbuf is a descendent of GdkPixbuf::Pixbuf with ICC support.
  # It attempts to load an image using jpegicc/littlecms to ensure that it is sRGB.
  class ProfiledPixbuf < GdkPixbuf::Pixbuf
    def valid_jpeg?(filename)
      return false unless File.exist?(filename)
      return false unless File.size(filename).positive?

      type, = GdkPixbuf::Pixbuf.get_file_info(filename)

      type && type.name.eql?('jpeg')
    rescue StandardError
      false
    end

    # TODO: this doesn't use lcms
    def self.from_string(string, loader: nil, chunk_size: 4096)
      loader ||= GdkPixbuf::PixbufLoader.new
      ((string.bytesize + chunk_size - 1) / chunk_size).times do |i|
        loader.write(string.byteslice(i * chunk_size, chunk_size))
      end
      loader.close
      loader.pixbuf
    end

    def self.default_icc_path(path)
      "#{path}.icc.jpg"
    end

    def initialize(file, local_options, scale_to = nil)
      @local_options = local_options
      @file = file

      if suitable_for_jpegicc?
        icc_file = icc_cache_path
        valid_jpeg?(icc_file) || system('jpgicc', '-q97', @file, icc_file)
        file = icc_file if valid_jpeg?(icc_file)
      end

      if scale_to
        super(file: file, width: scale_to, height: scale_to)
      else
        super(file: file)
      end
    end

    private

    def suitable_for_jpegicc?
      valid_jpeg?(@file)
    end

    def icc_cache_path
      @local_options['path.icc'] || Morandi::ProfiledPixbuf.default_icc_path(@file)
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
morandi-0.99.03	lib/morandi/profiled_pixbuf.rb