Add support for Core Image in attachment_fu via a new core_image_proc…

…essor class that uses a vendor imported mini core image library.

Updated attachment_fu to automatically use core image when available and fall back to Image Science, Rmagick and MiniMagick when not available.

init.rb

@@ -11,4 +11,6 @@ def make_tmpname(basename, n)
 require 'geometry'
 ActiveRecord::Base.send(:extend, Technoweenie::AttachmentFu::ActMethods)
 Technoweenie::AttachmentFu.tempfile_path = ATTACHMENT_FU_TEMPFILE_PATH if Object.const_defined?(:ATTACHMENT_FU_TEMPFILE_PATH)
-FileUtils.mkdir_p Technoweenie::AttachmentFu.tempfile_path
+FileUtils.mkdir_p Technoweenie::AttachmentFu.tempfile_path
+
+$:.unshift(File.dirname(__FILE__) + '/vendor')

lib/technoweenie/attachment_fu.rb

@@ -1,6 +1,6 @@
 module Technoweenie # :nodoc:
   module AttachmentFu # :nodoc:
-    @@default_processors = %w(ImageScience Rmagick MiniMagick)
+    @@default_processors = %w(CoreImage ImageScience Rmagick MiniMagick)
     @@tempfile_path      = File.join(RAILS_ROOT, 'tmp', 'attachment_fu')
     @@content_types      = ['image/jpeg', 'image/pjpeg', 'image/gif', 'image/png', 'image/x-png', 'image/jpg']
     mattr_reader :content_types, :tempfile_path, :default_processors

lib/technoweenie/attachment_fu/processors/core_image_processor.rb

@@ -0,0 +1,56 @@
+require 'red_artisan/core_image/processor'
+
+module Technoweenie # :nodoc:
+  module AttachmentFu # :nodoc:
+    module Processors
+      module CoreImageProcessor
+        def self.included(base)
+          base.send :extend, ClassMethods
+          base.alias_method_chain :process_attachment, :processing
+        end
+
+        module ClassMethods
+          def with_image(file, &block)
+            block.call OSX::CIImage.from(file)
+          end
+        end
+
+        protected
+          def process_attachment_with_processing
+            return unless process_attachment_without_processing
+            with_image do |img|
+              self.width  = img.extent.size.width  if respond_to?(:width)
+              self.height = img.extent.size.height if respond_to?(:height)
+              resize_image_or_thumbnail! img
+              callback_with_args :after_resize, img
+            end if image?
+          end
+
+          # Performs the actual resizing operation for a thumbnail
+          def resize_image(img, size)
+            processor = ::RedArtisan::CoreImage::Processor.new(img)
+            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)
+                processor.fit(size)
+              else
+                processor.resize(size[0], size[1])
+              end
+            else
+              new_size = [img.extent.size.width, img.extent.size.height] / size.to_s
+              processor.resize(new_size[0], new_size[1])
+            end
+
+            processor.render do |result|
+              self.width  = result.extent.size.width  if respond_to?(:width)
+              self.height = result.extent.size.height if respond_to?(:height)
+              result.save self.temp_path, OSX::NSJPEGFileType
+              self.size = File.size(self.temp_path)
+            end
+          end          
+      end
+    end
+  end
+end
+
+

test/fixtures/attachment.rb

@@ -94,6 +94,16 @@ class ImageScienceAttachment < ActiveRecord::Base
   puts "no ImageScience"
 end
 
+begin
+  class CoreImageAttachment < ActiveRecord::Base
+    has_attachment :path_prefix => 'vendor/plugins/attachment_fu/test/files',
+      :processor => :core_image, :thumbnails => { :thumb => [50, 51], :geometry => '31>' }, :resize_to => 55
+  end
+rescue MissingSourceFile
+  puts $!.message
+  puts "no CoreImage"
+end
+
 begin
   class MiniMagickAttachment < ActiveRecord::Base
     has_attachment :path_prefix => 'vendor/plugins/attachment_fu/test/files',

test/processors/core_image_test.rb

@@ -0,0 +1,31 @@
+require File.expand_path(File.join(File.dirname(__FILE__), '..', 'test_helper'))
+
+class CoreImageTest < Test::Unit::TestCase
+  attachment_model CoreImageAttachment
+
+  if Object.const_defined?(:OSX)
+    def test_should_resize_image
+      attachment = upload_file :filename => '/files/rails.png'
+      assert_valid attachment
+      assert attachment.image?
+      # test core image thumbnail
+      assert_equal 42, attachment.width
+      assert_equal 55, attachment.height
+
+      thumb      = attachment.thumbnails.detect { |t| t.filename =~ /_thumb/ }
+      geo        = attachment.thumbnails.detect { |t| t.filename =~ /_geometry/ }
+
+      # test exact resize dimensions
+      assert_equal 50, thumb.width
+      assert_equal 51, thumb.height
+
+      # test geometry string
+      assert_equal 31, geo.width
+      assert_equal 41, geo.height
+    end
+  else
+    def test_flunk
+      puts "CoreImage not loaded, tests not running"
+    end
+  end
+end

test/schema.rb

@@ -34,6 +34,17 @@
     t.column :type,            :string
   end
 
+  create_table :core_image_attachments, :force => true do |t|
+    t.column :parent_id,       :integer
+    t.column :thumbnail,       :string 
+    t.column :filename,        :string, :limit => 255
+    t.column :content_type,    :string, :limit => 255
+    t.column :size,            :integer
+    t.column :width,           :integer
+    t.column :height,          :integer
+    t.column :type,            :string
+  end
+
   create_table :mini_magick_attachments, :force => true do |t|
     t.column :parent_id,       :integer
     t.column :thumbnail,       :string 

vendor/red_artisan/core_image/filters/color.rb

@@ -0,0 +1,27 @@
+module RedArtisan
+  module CoreImage
+    module Filters
+      module Color
+
+        def greyscale(color = nil, intensity = 1.00)
+          create_core_image_context(@original.extent.size.width, @original.extent.size.height)
+
+          color = OSX::CIColor.colorWithString("1.0 1.0 1.0 1.0") unless color
+
+          @original.color_monochrome :inputColor => color, :inputIntensity => intensity do |greyscale|
+            @target = greyscale
+          end
+        end
+
+        def sepia(intensity = 1.00)
+          create_core_image_context(@original.extent.size.width, @original.extent.size.height)
+
+          @original.sepia_tone :inputIntensity => intensity do |sepia|
+            @target = sepia
+          end
+        end
+
+      end
+    end
+  end
+end

vendor/red_artisan/core_image/filters/effects.rb

@@ -0,0 +1,31 @@
+module RedArtisan
+  module CoreImage
+    module Filters
+      module Effects
+
+        def spotlight(position, points_at, brightness, concentration, color)
+          create_core_image_context(@original.extent.size.width, @original.extent.size.height)
+
+          @original.spot_light :inputLightPosition => vector3(*position), :inputLightPointsAt => vector3(*points_at), 
+                               :inputBrightness => brightness, :inputConcentration => concentration, :inputColor => color do |spot|
+            @target = spot
+          end
+        end
+
+        def edges(intensity = 1.00)
+          create_core_image_context(@original.extent.size.width, @original.extent.size.height)
+
+          @original.edges :inputIntensity => intensity do |edged|
+            @target = edged
+          end
+        end
+
+        private
+
+          def vector3(x, y, w)
+            OSX::CIVector.vectorWithX_Y_Z(x, y, w)
+          end
+      end
+    end
+  end
+end

vendor/red_artisan/core_image/filters/perspective.rb

@@ -0,0 +1,25 @@
+module RedArtisan
+  module CoreImage
+    module Filters
+      module Perspective
+
+        def perspective(top_left, top_right, bottom_left, bottom_right)
+          create_core_image_context(@original.extent.size.width, @original.extent.size.height)
+
+          @original.perspective_transform :inputTopLeft => top_left, :inputTopRight => top_right, :inputBottomLeft => bottom_left, :inputBottomRight => bottom_right do |transformed|
+            @target = transformed
+          end
+        end
+
+        def perspective_tiled(top_left, top_right, bottom_left, bottom_right)
+          create_core_image_context(@original.extent.size.width, @original.extent.size.height)
+
+          @original.perspective_tile :inputTopLeft => top_left, :inputTopRight => top_right, :inputBottomLeft => bottom_left, :inputBottomRight => bottom_right do |tiled|
+            @target = tiled
+          end
+        end
+
+      end
+    end
+  end
+end

vendor/red_artisan/core_image/filters/quality.rb

@@ -0,0 +1,25 @@
+module RedArtisan
+  module CoreImage
+    module Filters
+      module Quality
+
+        def reduce_noise(level = 0.02, sharpness = 0.4)
+          create_core_image_context(@original.extent.size.width, @original.extent.size.height)
+
+          @original.noise_reduction :inputNoiseLevel => level, :inputSharpness => sharpness do |noise_reduced|
+            @target = noise_reduced
+          end
+        end
+
+        def adjust_exposure(input_ev = 0.5)
+          create_core_image_context(@original.extent.size.width, @original.extent.size.height)
+
+          @original.exposure_adjust :inputEV => input_ev do |adjusted|
+            @target = adjusted
+          end          
+        end
+
+      end
+    end
+  end
+end

vendor/red_artisan/core_image/filters/scale.rb

@@ -0,0 +1,47 @@
+module RedArtisan
+  module CoreImage
+    module Filters
+      module Scale
+
+        def resize(width, height)
+          create_core_image_context(width, height)
+
+          scale_x, scale_y = scale(width, height)
+
+          @original.affine_clamp :inputTransform => OSX::NSAffineTransform.transform do |clamped|
+            clamped.lanczos_scale_transform :inputScale => scale_x > scale_y ? scale_x : scale_y, :inputAspectRatio => scale_x / scale_y do |scaled|
+              scaled.crop :inputRectangle => vector(0, 0, width, height) do |cropped|
+                @target = cropped
+              end
+            end
+          end
+        end
+
+        def thumbnail(width, height)
+          create_core_image_context(width, height)
+
+          transform = OSX::NSAffineTransform.transform
+          transform.scaleXBy_yBy *scale(width, height)
+
+          @original.affine_transform :inputTransform => transform do |scaled|
+            @target = scaled
+          end
+        end
+
+        def fit(size)
+          original_size = @original.extent.size
+          scale = size.to_f / (original_size.width > original_size.height ? original_size.width : original_size.height)
+          resize (original_size.width * scale).to_i, (original_size.height * scale).to_i
+        end
+
+        private
+
+          def scale(width, height)
+            original_size = @original.extent.size
+            return width.to_f / original_size.width.to_f, height.to_f / original_size.height.to_f
+          end
+
+      end
+    end
+  end
+end

vendor/red_artisan/core_image/filters/watermark.rb

@@ -0,0 +1,32 @@
+module RedArtisan
+  module CoreImage
+    module Filters
+      module Watermark
+
+        def watermark(watermark_image, tile = false, strength = 0.1)
+          create_core_image_context(@original.extent.size.width, @original.extent.size.height)
+
+          if watermark_image.respond_to? :to_str
+            watermark_image = OSX::CIImage.from(watermark_image.to_str)
+          end
+
+          if tile
+            tile_transform = OSX::NSAffineTransform.transform
+            tile_transform.scaleXBy_yBy 1.0, 1.0
+
+            watermark_image.affine_tile :inputTransform => tile_transform do |tiled|
+              tiled.crop :inputRectangle => vector(0, 0, @original.extent.size.width, @original.extent.size.height) do |tiled_watermark|
+                watermark_image = tiled_watermark
+              end
+            end
+          end
+
+          @original.dissolve_transition :inputTargetImage => watermark_image, :inputTime => strength do |watermarked|
+            @target = watermarked
+          end
+        end
+
+      end
+    end
+  end
+end