updated top the the new version of attachment_fu plugin to work out some

[selectricity-live] / vendor / plugins / attachment_fu / vendor / red_artisan / core_image / processor.rb

diff --git a/vendor/plugins/attachment_fu/vendor/red_artisan/core_image/processor.rb b/vendor/plugins/attachment_fu/vendor/red_artisan/core_image/processor.rb
new file mode 100644 (file)
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+++ b/vendor/plugins/attachment_fu/vendor/red_artisan/core_image/processor.rb
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+require 'rubygems'
+require 'osx/cocoa'
+require 'active_support'
+
+require 'red_artisan/core_image/filters/scale'
+require 'red_artisan/core_image/filters/color'
+require 'red_artisan/core_image/filters/watermark'
+require 'red_artisan/core_image/filters/quality'
+require 'red_artisan/core_image/filters/perspective'
+require 'red_artisan/core_image/filters/effects'
+
+# Generic image processor for scaling images based on CoreImage via RubyCocoa.
+#
+# Example usage:
+#
+# p = Processor.new OSX::CIImage.from(path_to_image)
+# p.resize(640, 480)
+# p.render do |result|
+#   result.save('resized.jpg', OSX::NSJPEGFileType)
+# end
+#
+# This will resize the image to the given dimensions exactly, if you'd like to ensure that aspect ratio is preserved:
+#
+# p = Processor.new OSX::CIImage.from(path_to_image)
+# p.fit(640)
+# p.render do |result|
+#   result.save('resized.jpg', OSX::NSJPEGFileType)
+# end
+#
+# fit(size) will attempt its best to resize the image so that the longest width/height (depending on image orientation) will match
+# the given size. The second axis will be calculated automatically based on the aspect ratio.
+#
+# Scaling is performed by first clamping the image so that its external bounds become infinite, this helps when scaling so that any
+# rounding discrepencies in dimensions don't affect the resultant image. We then perform a Lanczos transform on the image which scales
+# it to the target size. We then crop the image to the traget dimensions.
+#
+# If you are generating smaller images such as thumbnails where high quality rendering isn't as important, an additional method is
+# available:
+#
+# p = Processor.new OSX::CIImage.from(path_to_image)
+# p.thumbnail(100, 100)
+# p.render do |result|
+#   result.save('resized.jpg', OSX::NSJPEGFileType)
+# end
+#
+# This will perform a straight affine transform and scale the X and Y boundaries to the requested size. Generally, this will be faster
+# than a lanczos scale transform, but with a scaling quality trade.
+#
+# More than welcome to intregrate any patches, improvements - feel free to mail me with ideas.
+#
+# Thanks to
+# * Satoshi Nakagawa for working out that OCObjWrapper needs inclusion when aliasing method_missing on existing OSX::* classes.
+# * Vasantha Crabb for general help and inspiration with Cocoa
+# * Ben Schwarz for example image data and collaboration during performance testing
+#
+# Copyright (c) Marcus Crafter <crafterm@redartisan.com> released under the MIT license
+#
+module RedArtisan
+  module CoreImage
+    class Processor
+  
+      def initialize(original)
+        if original.respond_to? :to_str
+          @original = OSX::CIImage.from(original.to_str)
+        else
+          @original = original
+        end
+      end
+  
+      def render(&block)
+        raise "unprocessed image: #{@original}" unless @target
+        block.call @target
+      end
+      
+      include Filters::Scale, Filters::Color, Filters::Watermark, Filters::Quality, Filters::Perspective, Filters::Effects
+  
+      private
+  
+        def create_core_image_context(width, height)
+               output = OSX::NSBitmapImageRep.alloc.initWithBitmapDataPlanes_pixelsWide_pixelsHigh_bitsPerSample_samplesPerPixel_hasAlpha_isPlanar_colorSpaceName_bytesPerRow_bitsPerPixel(nil, width, height, 8, 4, true, false, OSX::NSDeviceRGBColorSpace, 0, 0)
+               context = OSX::NSGraphicsContext.graphicsContextWithBitmapImageRep(output)
+               OSX::NSGraphicsContext.setCurrentContext(context)
+               @ci_context = context.CIContext
+        end
+        
+        def vector(x, y, w, h)
+          OSX::CIVector.vectorWithX_Y_Z_W(x, y, w, h)
+        end
+    end
+  end
+end
+
+module OSX
+  class CIImage
+    include OCObjWrapper
+  
+    def method_missing_with_filter_processing(sym, *args, &block)
+      f = OSX::CIFilter.filterWithName("CI#{sym.to_s.camelize}")
+      return method_missing_without_filter_processing(sym, *args, &block) unless f
+    
+      f.setDefaults if f.respond_to? :setDefaults
+      f.setValue_forKey(self, 'inputImage')
+      options = args.last.is_a?(Hash) ? args.last : {}
+      options.each { |k, v| f.setValue_forKey(v, k.to_s) }
+    
+      block.call f.valueForKey('outputImage')
+    end
+  
+    alias_method_chain :method_missing, :filter_processing
+      
+    def save(target, format = OSX::NSJPEGFileType, properties = nil)
+      bitmapRep = OSX::NSBitmapImageRep.alloc.initWithCIImage(self)
+      blob = bitmapRep.representationUsingType_properties(format, properties)
+      blob.writeToFile_atomically(target, false)
+    end
+  
+    def self.from(filepath)
+      raise Errno::ENOENT, "No such file or directory - #{filepath}" unless File.exists?(filepath)
+      OSX::CIImage.imageWithContentsOfURL(OSX::NSURL.fileURLWithPath(filepath))
+    end
+  end
+end
+