projects.mako.cc - selectricity/blob - vendor/plugins/attachment_fu/lib/technoweenie/attachment_fu/processors/gd2_processor.rb

   1 require 'rubygems'
   2 require 'gd2'
   3 module Technoweenie # :nodoc:
   4   module AttachmentFu # :nodoc:
   5     module Processors
   6       module Gd2Processor
   7         def self.included(base)
   8           base.send :extend, ClassMethods
   9           base.alias_method_chain :process_attachment, :processing
  10         end
  11
  12         module ClassMethods
  13           # Yields a block containing a GD2 Image for the given binary data.
  14           def with_image(file, &block)
  15             im = GD2::Image.import(file)
  16             block.call(im)
  17           end
  18         end
  19
  20         protected
  21           def process_attachment_with_processing
  22             return unless process_attachment_without_processing && image?
  23             with_image do |img|
  24               resize_image_or_thumbnail! img
  25               self.width  = img.width
  26               self.height = img.height
  27               callback_with_args :after_resize, img
  28             end
  29           end
  30
  31           # Performs the actual resizing operation for a thumbnail
  32           def resize_image(img, size)
  33             size = size.first if size.is_a?(Array) && size.length == 1
  34             if size.is_a?(Fixnum) || (size.is_a?(Array) && size.first.is_a?(Fixnum))
  35               if size.is_a?(Fixnum)
  36                 # Borrowed from image science's #thumbnail method and adapted
  37                 # for this.
  38                 scale = size.to_f / (img.width > img.height ? img.width.to_f : img.height.to_f)
  39                 img.resize!((img.width * scale).round(1), (img.height * scale).round(1), false)
  40               else
  41                 img.resize!(size.first, size.last, false)
  42               end
  43             else
  44               w, h = [img.width, img.height] / size.to_s
  45               img.resize!(w, h, false)
  46             end
  47             temp_paths.unshift random_tempfile_filename
  48             self.size = img.export(self.temp_path)
  49           end
  50
  51       end
  52     end
  53   end
  54 end