Class: FastImage

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

Defined Under Namespace

Classes: FormatNotSupported

Constant Summary collapse

SUPPORTED_FORMATS =
[:jpeg, :png, :gif]
FILE_EXTENSIONS =

prefer jpg to jpeg as an extension

[:jpg, :png, :gif]

Class Method Summary collapse

Class Method Details

.resize(input, w, h, options = {}) ⇒ Object

Resizes an image, storing the result in a file given in file_out

Input can be a filename, a uri, or an IO object.

FastImage Resize can resize GIF, JPEG and PNG files.

Giving a zero value for width or height causes the image to scale proportionately.

Example

require 'fastimage_resize'

FastImage.resize("http://stephensykes.com/images/ss.com_x.gif", 100, 20, :outfile=>"my.gif")

Supported options

:jpeg_quality

A figure passed to libgd to determine quality of output jpeg (only useful if input is jpeg)

:outfile

Name of a file to store the output in, in this case a temp file is not used


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# File 'lib/fastimage_resize.rb', line 61

def self.resize(input, w, h, options={})
  jpeg_quality = options[:jpeg_quality] || -1
  file_out = options[:outfile]
  
  if input.respond_to?(:read)
    file_in = read_to_local(input)
  else
    if input =~ URI.regexp(['http','https','ftp'])
      u = URI.parse(input)
      file_in = read_to_local(open(u))
    else
      file_in = input.to_s
    end
  end

  fast_image = new(file_in, :raise_on_failure=>true)
  type_index = SUPPORTED_FORMATS.index(fast_image.type)
  raise FormatNotSupported unless type_index

  if !file_out
    temp_file = Tempfile.new([name, ".#{FILE_EXTENSIONS[type_index]}"])
    temp_file.binmode
    file_out = temp_file.path
  else
    temp_file = nil
  end

  in_path = file_in.respond_to?(:path) ? file_in.path : file_in

  fast_image.resize_image(in_path, file_out.to_s, w.to_i, h.to_i, type_index, jpeg_quality.to_i)

  if file_in.respond_to?(:close)
    file_in.close
    file_in.unlink
  end

  temp_file
rescue OpenURI::HTTPError, SocketError, URI::InvalidURIError, RuntimeError => e
  raise ImageFetchFailure, e.class
end