53 lines
1.3 KiB
Ruby
53 lines
1.3 KiB
Ruby
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module Jekyll
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class ResponsiveImage
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class ResizeHandler
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def resize_image(img, 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 / img.columns.to_f
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height = (img.rows.to_f * ratio).round
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next unless needs_resizing?(img, width)
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filepath = format_output_path(config['output_path_format'], img.filename, width, height)
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resized.push(Utils.image_hash(filepath, width, height))
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# Don't resize images more than once
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next if File.exists?(filepath)
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ensure_output_dir_exists!(File.dirname(filepath))
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Jekyll.logger.info "Generating #{filepath}"
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i = img.scale(ratio)
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i.write(filepath) do |f|
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f.quality = size['quality'] || config['default_quality']
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end
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i.destroy!
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end
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resized
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end
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def format_output_path(format, path, width, height)
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params = Utils.symbolize_keys(Utils.image_hash(path, width, height))
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format % params
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end
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def needs_resizing?(img, width)
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img.columns > width
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end
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def ensure_output_dir_exists!(dir)
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unless Dir.exists?(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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