48 lines
1.2 KiB
Ruby
48 lines
1.2 KiB
Ruby
module Jekyll
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module ResponsiveImage
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class ImageResizer
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def self.resize(image, config)
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self.new.resize(image, config)
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end
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def resize(image, config)
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resized = []
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config['sizes'].each do |size|
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width = size['width']
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ratio = width.to_f / image.columns.to_f
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height = (image.rows.to_f * ratio).round
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next unless needs_resizing?(image, width)
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image_path = image.filename.force_encoding(Encoding::UTF_8)
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output_path = image_path
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resized.push(Image.new(width, height, config))
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# Don't resize images more than once
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next if File.exist?(output_path)
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resized = image.scale(ratio)
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resized.write(output_path) do |i|
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i.quality = size['quality'] || config['default_quality']
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end
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end
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resized
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end
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def needs_resizing?(image, width)
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image.columns > width
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end
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def ensure_output_dir_exists!(dir)
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unless Dir.exist?(dir)
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Jekyll.logger.info "Creating output directory #{dir}"
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FileUtils.mkdir_p(dir)
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end
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end
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end
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end
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end
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