44 lines
1.1 KiB
Ruby
Executable file
44 lines
1.1 KiB
Ruby
Executable file
#!/usr/bin/ruby -w
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SCALES = [1, 2, 3]
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def usage
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name = File.basename(__FILE__)
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puts "Usage: #{name} <size> <input-image> <output-directory>"
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end
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def generate_all_scales(size, in_file, out_dir)
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SCALES.each do |scale|
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scale_retina(size, scale, in_file, out_dir)
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end
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end
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def scale_retina(points, scale, in_file, out_dir)
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file_scale = scale > 1 ? "@#{scale}x" : ''
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ext = "_#{points}#{file_scale}.png"
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filename = File.basename(in_file).sub(/\.\w+$/, ext)
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size = points * scale
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out_file = File.join(out_dir, filename)
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puts "> convert '#{in_file}' -scale #{size}x#{size} '#{out_file}'"
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output = `convert '#{in_file}' -scale #{size}x#{size} '#{out_file}'`.strip
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puts output if output.length > 0
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end
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raw_size, in_file, out_dir = ARGV
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size = raw_size.to_f
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unless size > 0
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puts "Invalid size: #{raw_size.inspect}"
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usage
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exit 1
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end
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unless File.exist?(in_file)
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puts "Input image not found: #{in_file}"
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usage
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exit 2
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end
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unless File.directory?(out_dir)
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puts "Output directory not found: #{out_dir}"
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usage
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exit 1
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end
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generate_all_scales(size, in_file, out_dir)
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