added attachment_fu and made the set of changes

[selectricity-live] / vendor / plugins / attachment_fu / lib / technoweenie / attachment_fu / processors / image_science_processor.rb

diff --git a/vendor/plugins/attachment_fu/lib/technoweenie/attachment_fu/processors/image_science_processor.rb b/vendor/plugins/attachment_fu/lib/technoweenie/attachment_fu/processors/image_science_processor.rb
new file mode 100644 (file)
index 0000000..095283c
--- /dev/null
+++ b/vendor/plugins/attachment_fu/lib/technoweenie/attachment_fu/processors/image_science_processor.rb
@@ -0,0 +1,61 @@
+require 'image_science'
+module Technoweenie # :nodoc:
+  module AttachmentFu # :nodoc:
+    module Processors
+      module ImageScienceProcessor
+        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)
+            ::ImageScience.with_image file, &block
+          end
+        end
+
+        protected
+          def process_attachment_with_processing
+            return unless process_attachment_without_processing && image?
+            with_image do |img|
+              self.width  = img.width  if respond_to?(:width)
+              self.height = img.height if respond_to?(:height)
+              resize_image_or_thumbnail! img
+            end
+          end
+
+          # Performs the actual resizing operation for a thumbnail
+          def resize_image(img, size)
+            # create a dummy temp file to write to
+            # ImageScience doesn't handle all gifs properly, so it converts them to
+            # pngs for thumbnails.  It has something to do with trying to save gifs
+            # with a larger palette than 256 colors, which is all the gif format
+            # supports.
+            filename.sub! /gif$/, 'png'
+            content_type.sub!(/gif$/, 'png')
+            self.temp_path = write_to_temp_file(filename)
+            grab_dimensions = lambda do |img|
+              self.width  = img.width  if respond_to?(:width)
+              self.height = img.height if respond_to?(:height)
+              img.save self.temp_path
+              self.size = File.size(self.temp_path)
+              callback_with_args :after_resize, img
+            end
+
+            size = size.first if size.is_a?(Array) && size.length == 1
+            if size.is_a?(Fixnum) || (size.is_a?(Array) && size.first.is_a?(Fixnum))
+              if size.is_a?(Fixnum)
+                img.thumbnail(size, &grab_dimensions)
+              else
+                img.resize(size[0], size[1], &grab_dimensions)
+              end
+            else
+              new_size = [img.width, img.height] / size.to_s
+              img.resize(new_size[0], new_size[1], &grab_dimensions)
+            end
+          end
+      end
+    end
+  end
+end
\ No newline at end of file