Class: EXIFR::JPEG

Inherits:

Object

• Object
• EXIFR::JPEG

show all

Defined in:

lib/exifr/jpeg.rb

Overview

EXIFR::JPEG.new('IMG_3422.JPG').width         # -> 2272
EXIFR::JPEG.new('IMG_3422.JPG').exif.model    # -> "Canon PowerShot G3"

Instance Attribute Summary (collapse)

• - (Object) app1s readonly

  raw APP1 frames.

• - (Object) bits readonly

  number of bits per ??.

• - (Object) comment readonly

  comment; a string if one comment found, an array if more, otherwise nil.

• - (Object) exif readonly

  EXIF data if available.

• - (Object) exif_data readonly

  raw EXIF data.

• - (Object) height readonly

  image height.

• - (Object) width readonly

  image width.

Class Method Summary (collapse)

• + (Object) instance_methods(include_super = true)

  :nodoc:.

• + (Object) instance_methods_without_jpeg_extras

Instance Method Summary (collapse)

• - (Boolean) exif?

  Returns true when EXIF data is available.

• - (JPEG) initialize(file) constructor

  file is a filename or an IO object.

• - (Object) method_missing(method, *args)

  Dispatch to EXIF.

• - (Object) methods

  :nodoc:.

• - (Boolean) respond_to?(method)

  :nodoc:.

• - (Object) thumbnail

  Return thumbnail data when available.

• - (Object) to_hash

  Get a hash presentation of the image.

30
31
32
33
34
35
36

# File 'lib/exifr/jpeg.rb', line 30

def initialize(file)
  if file.kind_of? String
    File.open(file, 'rb') { |io| examine(io) }
  else
    examine(file.dup)
  end
end

57
58
59
60
61

# File 'lib/exifr/jpeg.rb', line 57

def method_missing(method, *args)
  super unless args.empty?
  super unless methods.include?(method.to_s)
  @exif.send method if defined?(@exif) && @exif
end

27
28
29

# File 'lib/exifr/jpeg.rb', line 27

def app1s
  @app1s
end

18
19
20

# File 'lib/exifr/jpeg.rb', line 18

def bits
  @bits
end

21
22
23

# File 'lib/exifr/jpeg.rb', line 21

def comment
  @comment
end

23
24
25

# File 'lib/exifr/jpeg.rb', line 23

def exif
  @exif
end

25
26
27

# File 'lib/exifr/jpeg.rb', line 25

def exif_data
  @exif_data
end

14
15
16

# File 'lib/exifr/jpeg.rb', line 14

def height
  @height
end

16
17
18

# File 'lib/exifr/jpeg.rb', line 16

def width
  @width
end

73
74
75

# File 'lib/exifr/jpeg.rb', line 73

def instance_methods(include_super = true) # :nodoc:
  instance_methods_without_jpeg_extras(include_super) + TIFF::TAGS << "gps"
end

72

# File 'lib/exifr/jpeg.rb', line 72

alias instance_methods_without_jpeg_extras instance_methods

39
40
41

# File 'lib/exifr/jpeg.rb', line 39

def exif?
  !exif.nil?
end

67
68
69

# File 'lib/exifr/jpeg.rb', line 67

def methods # :nodoc:
  super + TIFF::TAGS << "gps"
end

63
64
65

# File 'lib/exifr/jpeg.rb', line 63

def respond_to?(method) # :nodoc:
  super || methods.include?(method.to_s)
end

44
45
46

# File 'lib/exifr/jpeg.rb', line 44

def thumbnail
  defined?(@exif) && @exif && @exif.jpeg_thumbnails && @exif.jpeg_thumbnails.first
end

49
50
51
52
53

# File 'lib/exifr/jpeg.rb', line 49

def to_hash
  h = {:width => width, :height => height, :bits => bits, :comment => comment}
  h.merge!(exif) if exif?
  h
end