module AttachmentSaver::Processors::MiniMagick
Public Instance Methods
examine_image()
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# File lib/processors/mini_magick.rb, line 30 def examine_image with_image_attributes(uploaded_file_path) do |original_image| self.content_type = original_image.mime_type unless self.class.attachment_options[:keep_content_type] || original_image.mime_type.blank? self.file_extension = original_image.file_type_extension unless self.class.attachment_options[:keep_file_extension] || original_image.file_type_extension.blank? self.width = original_image.width if respond_to?(:width) self.height = original_image.height if respond_to?(:height) end rescue AttachmentSaverError raise rescue Exception => ex raise MiniMagickProcessorError, "#{ex.class}: #{ex.message}", ex.backtrace end
process_image(original_image, derived_format_name, resize_format)
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# File lib/processors/mini_magick.rb, line 43 def process_image(original_image, derived_format_name, resize_format) resize_format = Image.from_geometry_string(resize_format) if resize_format.is_a?(String) original_image.send(*resize_format) do |derived_image| return nil unless want_format?(derived_format_name, derived_image.width, derived_image.height) # both original_filename and content_type must be defined for parents when using image processing # - but apps can just define them using attr_accessor if they don't want them persisted to db derived_content_type = derived_image.mime_type || original_image.mime_type || content_type derived_extension = derived_image.file_type_extension # we leverage tempfiles as discussed in the uploaded_file method temp = Tempfile.new(["asmtemp", ".#{derived_extension}"], tempfile_directory) temp.binmode temp.close derived_image.write(temp.path) temp.open # we close & reopen so we see the file the processor wrote to, even if it created a new file rather than writing into our tempfile { :format_name => derived_format_name.to_s, :width => derived_image.width, :height => derived_image.height, :content_type => derived_content_type, :file_extension => derived_extension, :uploaded_data => temp } end end
with_image(filename, &block)
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# File lib/processors/mini_magick.rb, line 12 def with_image(filename, &block) # note that we are instantiating minimagick on the file itself, not a copy (which is # what gets produced if you call from_file); we don't do any mutating operations on # our instances themselves (resize_to and crop_to create new instances). if ::MiniMagick::Image.respond_to?(:open) # v3 image = ::MiniMagick::Image.open(filename) else # v1 image = ::MiniMagick::Image.new(filename) end block.call(image.extend(Operations)) end
with_image_attributes(filename, &block)
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# File lib/processors/mini_magick.rb, line 24 def with_image_attributes(filename, &block) # MiniMagick doesn't actually load the image, it just keeps a reference to the filename # and invokes the imagemagick programs to determine attributes with_image(filename, &block) end