--- /dev/null
+require 'RMagick'
+module Technoweenie # :nodoc:
+ module AttachmentFu # :nodoc:
+ module Processors
+ module RmagickProcessor
+ def self.included(base)
+ base.send :extend, ClassMethods
+ base.alias_method_chain :process_attachment, :processing
+ end
+
+ module ClassMethods
+ # Yields a block containing an RMagick Image for the given binary data.
+ def with_image(file, &block)
+ begin
+ binary_data = file.is_a?(Magick::Image) ? file : Magick::Image.read(file).first unless !Object.const_defined?(:Magick)
+ rescue
+ # Log the failure to load the image. This should match ::Magick::ImageMagickError
+ # but that would cause acts_as_attachment to require rmagick.
+ logger.debug("Exception working with image: #{$!}")
+ binary_data = nil
+ end
+ block.call binary_data if block && binary_data
+ ensure
+ !binary_data.nil?
+ end
+ end
+
+ protected
+ def process_attachment_with_processing
+ return unless process_attachment_without_processing
+ with_image do |img|
+ resize_image_or_thumbnail! img
+ self.width = img.columns if respond_to?(:width)
+ self.height = img.rows if respond_to?(:height)
+ callback_with_args :after_resize, img
+ end if image?
+ end
+
+ # Performs the actual resizing operation for a thumbnail
+ def resize_image(img, size)
+ size = size.first if size.is_a?(Array) && size.length == 1 && !size.first.is_a?(Fixnum)
+ if size.is_a?(Fixnum) || (size.is_a?(Array) && size.first.is_a?(Fixnum))
+ size = [size, size] if size.is_a?(Fixnum)
+ img.thumbnail!(*size)
+ else
+ img.change_geometry(size.to_s) { |cols, rows, image| image.resize!(cols, rows) }
+ end
+ self.temp_path = write_to_temp_file(img.to_blob)
+ end
+ end
+ end
+ end
+end
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