Class: ImageSize

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

Defined Under Namespace

Modules: Type

Constant Summary collapse

JpegCodeCheck = 
[
  "\xc0", "\xc1", "\xc2", "\xc3",
  "\xc5", "\xc6", "\xc7",
  "\xc9", "\xca", "\xcb",
  "\xcd", "\xce", "\xcf",
]

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(img_data, img_type = nil) ⇒ ImageSize

receive image & make size argument 1 is image String, StringIO or IO argument 2 is type(ImageSize::Type::GIF and so on.) or nil



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# File 'lib/image_size.rb', line 40

def initialize(img_data, img_type = nil)
  @img_data = img_data.dup
  @img_width  = nil
  @img_height = nil
  @img_type   = nil

  if @img_data.is_a?(IO)
    img_top = @img_data.read(1024)
    img_io = def_read_o(@img_data)
  elsif @img_data.is_a?(StringIO)
    img_top = @img_data.read(1024)
    img_io = def_read_o(@img_data)
  elsif @img_data.is_a?(String)
    img_top = @img_data[0, 1024]
#      img_io = StringIO.open(@img_data){|sio| io = def_read_o(sio); io }
    img_io = StringIO.open(@img_data)
    img_io = def_read_o(img_io)
  else
    raise "argument class error!! #{img_data.type}"
  end
  
  if @img_type.nil?
    @img_type = check_type(img_top)
  else
    type = Type.constants.find{|t| img_type == t }
    raise("type is failed. #{img_type}\n") if !type
    @img_type = img_type
  end

  if @img_type != Type::OTHER
    @img_width, @img_height = self.__send__("measure_#{@img_type}", img_io)
  else
    @img_width, @img_height = [nil, nil]
  end
  
  if @img_data.is_a?(String)
    img_io.close
  end
end

Class Method Details

.type_list ⇒ Object

image type list



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# File 'lib/image_size.rb', line 33

def ImageSize.type_list
  Type.constants 
end

Instance Method Details

#get_height ⇒ Object Also known as: height, h

get image height



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# File 'lib/image_size.rb', line 85

def get_height
  if @img_type == Type::OTHER then nil else @img_height end
end

#get_size ⇒ Object Also known as: size

get image width and height(Array)



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# File 'lib/image_size.rb', line 95

def get_size
  [self.get_width, self.get_height]
end

#get_type ⇒ Object

get image type ex. “GIF”, “PNG”, “JPEG”



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# File 'lib/image_size.rb', line 82

def get_type; @img_type; end

#get_width ⇒ Object Also known as: width, w

get image width



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# File 'lib/image_size.rb', line 90

def get_width
  if @img_type == Type::OTHER then nil else @img_width end
end