+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
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