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39 lines
1.4 KiB
39 lines
1.4 KiB
# frozen_string_literal: true
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module Paperclip
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class LazyThumbnail < Paperclip::Thumbnail
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def make
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return File.open(@file.path) unless needs_convert?
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if options[:geometry]
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min_side = [@current_geometry.width, @current_geometry.height].min.to_i
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options[:geometry] = "#{min_side}x#{min_side}#" if @target_geometry.square? && min_side < @target_geometry.width
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elsif options[:pixels]
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width = Math.sqrt(options[:pixels] * (@current_geometry.width.to_f / @current_geometry.height)).round.to_i
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height = Math.sqrt(options[:pixels] * (@current_geometry.height.to_f / @current_geometry.width)).round.to_i
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options[:geometry] = "#{width}x#{height}>"
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end
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Paperclip::Thumbnail.make(file, options, attachment)
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end
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private
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def needs_convert?
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needs_different_geometry? || needs_different_format? || needs_metadata_stripping?
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end
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def needs_different_geometry?
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(options[:geometry] && @current_geometry.width != @target_geometry.width && @current_geometry.height != @target_geometry.height) ||
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(options[:pixels] && @current_geometry.width * @current_geometry.height > options[:pixels])
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end
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def needs_different_format?
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@format.present? && @current_format != @format
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end
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def needs_metadata_stripping?
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@attachment.instance.respond_to?(:local?) && @attachment.instance.local?
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end
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end
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end
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