Class: TimestampMaker::Handlers::ImageMagick

Inherits:
Object
  • Object
show all
Defined in:
lib/timestamp_maker/handlers/image_magick.rb

Constant Summary collapse

GRAVITY_MAP = 
{
  'top-left' => 'NorthWest',
  'top-right' => 'NorthEast',
  'bottom-left' => 'SouthWest',
  'bottom-right' => 'SouthEast'
}.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(time_zone_lookuper:) ⇒ ImageMagick

Returns a new instance of ImageMagick.



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# File 'lib/timestamp_maker/handlers/image_magick.rb', line 20

def initialize(time_zone_lookuper:)
  @time_zone_lookuper = time_zone_lookuper
end

Instance Attribute Details

#time_zone_lookuper ⇒ Object

Returns the value of attribute time_zone_lookuper.



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# File 'lib/timestamp_maker/handlers/image_magick.rb', line 18

def time_zone_lookuper
  @time_zone_lookuper
end

Instance Method Details

#accept?(mime_type) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/timestamp_maker/handlers/image_magick.rb', line 24

def accept?(mime_type)
  mime_type.start_with?('image/')
end

#add_timestamp(input_path, output_path, time, format:, font_size:, font_family:, font_color:, background_color:, coordinate_origin:, x:, y:, font_padding:) ⇒ Object 



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# File 'lib/timestamp_maker/handlers/image_magick.rb', line 28

def add_timestamp(
  input_path,
  output_path,
  time,
  format:,
  font_size:,
  font_family:,
  font_color:,
  background_color:,
  coordinate_origin:,
  x:,
  y:,
  font_padding:
)
  time_string = time.strftime(format)
  command = %W[
    convert #{input_path}
    (
    -background #{background_color}
    -fill #{font_color}
    -family #{font_family}
    -pointsize #{font_size}
    -gravity NorthWest
    -splice #{font_padding}x#{font_padding}
    -gravity SouthEast
    -splice #{font_padding}x#{font_padding}
    label:#{time_string}
    )
    -gravity #{GRAVITY_MAP[coordinate_origin]}
    -geometry +#{x}+#{y}
    -composite #{output_path}
  ]
  raise "Command failed with exit #{$CHILD_STATUS.exitstatus}: #{command.first}" unless system(*command)
end

#creation_time(input_path) ⇒ Object 



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# File 'lib/timestamp_maker/handlers/image_magick.rb', line 63

def creation_time(input_path)
  command = %W[
    identify -format %[exif:DateTime*]%[exif:OffsetTime*]%[exif:GPSLatitude*]%[exif:GPSLongitude*] #{input_path}
  ]

  stdout_string, status = Open3.capture2(*command)
  raise unless status.success?

  parsed = Hash[stdout_string.split("\n").map! { |i| i[5..-1].split('=') }]

  time_string = parsed['DateTimeOriginal'] || parsed['DateTimeDigitized'] || parsed['DateTime']
  raise 'Cannot find creation time' if time_string.nil?

  time_arguments = time_string.split(/[: ]/).map(&:to_i)

  if (time_zone = retrieve_time_zone_by_coordinate(parsed))
    begin
      return TZInfo::Timezone.get(time_zone).local_time(*time_arguments)
    rescue TZInfo::InvalidTimezoneIdentifier
      warn "Can not find time zone: #{time_zone}"
    end
  end

  time_offset_string = parsed['OffsetTimeOriginal'] || parsed['OffsetTimeDigitized'] || parsed['OffsetTime']
  raise 'Can not find time offset' if time_offset_string.nil?

  Time.new(*time_arguments, time_offset_string)
end