#{RAILS_ROOT}/vendor/plugins/file_column/lib/magick_file_column.rb:85:in `write'
#{RAILS_ROOT}/vendor/plugins/file_column/lib/magick_file_column.rb:85:in `resize_image'
#{RAILS_ROOT}/vendor/plugins/file_column/lib/magick_file_column.rb:85:in `open'
#{RAILS_ROOT}/vendor/plugins/file_column/lib/magick_file_column.rb:85:in `resize_image'
#{RAILS_ROOT}/vendor/plugins/file_column/lib/magick_file_column.rb:19:in `transform_with_magick'
#{RAILS_ROOT}/vendor/plugins/file_column/lib/magick_file_column.rb:15:in `each_pair'
#{RAILS_ROOT}/vendor/plugins/file_column/lib/magick_file_column.rb:15:in `transform_with_magick'
#{RAILS_ROOT}/vendor/plugins/file_column/lib/magick_file_column.rb:150:in `path_magick_after_assign'
#{RAILS_ROOT}/vendor/plugins/file_column/lib/file_column.rb:660:in `send'
#{RAILS_ROOT}/vendor/plugins/file_column/lib/file_column.rb:660:in `path='
#{RAILS_ROOT}/vendor/plugins/file_column/lib/file_column.rb:659:in `each'
#{RAILS_ROOT}/vendor/plugins/file_column/lib/file_column.rb:659:in `path='
# magick_file_column
module FileColumn # :nodoc:
class BaseUploadedFile # :nodoc:
def transform_with_magick
if needs_resize?
begin
img = ::Magick::Image::read(absolute_path).first
rescue ::Magick::ImageMagickError
@magick_errors ||= []
@magick_errors << "invalid image"
return
end
if options[:magick][:versions]
options[:magick][:versions].each_pair do |version, version_options|
next if version_options[:lazy]
dirname = version_options[:name]
FileUtils.mkdir File.join(@dir, dirname)
resize_image(img, version_options, absolute_path(dirname))
end
end
if options[:magick][:size] or options[:magick][:crop]
resize_image(img, options[:magick], absolute_path)
end
GC.start
end
end
def create_magick_version_if_needed(version)
# RMagick might not have been loaded so far.
# We do not want to require it on every call of this method
# as this might be fairly expensive, so we just try if ::Magick
# exists and require it if not.
begin
::Magick
rescue NameError
require 'RMagick'
end
if version.is_a?(Symbol)
version_options = options[:magick][:versions][version]
else
version_options = MagickExtension::process_options(version)
end
unless File.exists?(absolute_path(version_options[:name]))
img = ::Magick::Image::read(absolute_path).first
dirname = version_options[:name]
FileUtils.mkdir File.join(@dir, dirname)
resize_image(img, version_options, absolute_path(dirname))
end
version_options[:name]
end
attr_reader :magick_errors
def has_magick_errors?
@magick_errors and !@magick_errors.empty?
end
private
def needs_resize?
options[:magick] and just_uploaded? and
(options[:magick][:size] or options[:magick][:versions])
end
def resize_image(img, img_options, dest_path)
begin
if img_options[:crop]
dx, dy = img_options[:crop].split(':').map { |x| x.to_f }
w, h = (img.rows * dx / dy), (img.columns * dy / dx)
img = img.crop(::Magick::CenterGravity, [img.columns, w].min,
[img.rows, h].min)
end
if img_options[:size]
img = img.change_geometry(img_options[:size]) do |c, r, i|
i.resize(c, r)
end
end
ensure
File.open(dest_path, "wb", options[:permissions]) {|f| img.write f}
end
end
end
# If you are using file_column to upload images, you can
# directly process the images with RMagick,
# a ruby extension
# for accessing the popular imagemagick libraries. You can find
# more information about RMagick at http://rmagick.rubyforge.org.
#
# You can control what to do by adding a <tt>:magick</tt> option
# to your options hash. All operations are performed immediately
# after a new file is assigned to the file_column attribute (i.e.,
# when a new file has been uploaded).
#
# To resize the uploaded image according to an imagemagick geometry
# string, just use the <tt>:size</tt> option:
#
# file_column :image, :magick => {:size => "800x600>"}
#
# You can also create additional versions of your image, for example
# thumb-nails, like this:
# file_column :image, :magick => {:versions => {
# :thumb => {:size => "50x50"},
# :medium => {:size => "640x480>"}
# }
#
# If you wish to crop your images with a size ratio before scaling
# them according to your version geometry, you can use the :crop directive.
# file_column :image, :magick => {:versions => {
# :square => {:crop => "1:1", :size => "50x50", :name => "thumb"},
# :screen => {:crop => "4:3", :size => "640x480>"},
# :widescreen => {:crop => "16:9", :size => "640x360!"},
# }
# }
#
# These versions will be stored in separate sub-directories, named like the
# symbol you used to identify the version. So in the previous example, the
# image versions will be stored in "thumb", "screen" and "widescreen"
# directories, resp.
# A name different from the symbol can be set via the <tt>:name</tt> option.
#
# These versions can be accessed via FileColumnHelper's +url_for_image_column+
# method like this:
#
# <%= url_for_image_column "entry", "image", :thumb %>
#
# <b>Note:</b> You'll need the
# RMagick extension being installed in order to use file_column's
# imagemagick integration.
module MagickExtension
def self.file_column(klass, attr, options) # :nodoc:
require 'RMagick'
options[:magick] = process_options(options[:magick],false) if options[:magick]
if options[:magick][:versions]
options[:magick][:versions].each_pair do |name, value|
options[:magick][:versions][name] = process_options(value, name.to_s)
end
end
state_method = "#{attr}_state".to_sym
after_assign_method = "#{attr}_magick_after_assign".to_sym
klass.send(:define_method, after_assign_method) do
self.send(state_method).transform_with_magick
end
options[:after_upload] ||= []
options[:after_upload] << after_assign_method
klass.validate do |record|
state = record.send(state_method)
if state.has_magick_errors?
state.magick_errors.each do |error|
record.errors.add attr, error
end
end
end
end
def self.process_options(options,create_name=true)
options = {:size => options } if options.kind_of?(String)
if options[:geometry]
options[:size] = options.delete(:geometry)
end
if options[:name].nil? and create_name
if create_name == true
hash = 0
for key in [:size, :crop]
hash = hash ^ options[key].hash if options[key]
end
options[:name] = hash.abs.to_s(36)
else
options[:name] = create_name
end
end
options
end
end
end