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33 lines
1.2 KiB
Ruby
33 lines
1.2 KiB
Ruby
# frozen_string_literal: true
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module Paperclip
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class BlurhashTranscoder < Paperclip::Processor
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def make
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return @file unless options[:style] == :small || options[:blurhash]
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width, height, data = blurhash_params
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# Guard against segfaults if data has unexpected size
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raise RangeError, "Invalid image data size (expected #{width * height * 3}, got #{data.size})" if data.size != width * height * 3 # TODO: should probably be another exception type
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attachment.instance.blurhash = Blurhash.encode(width, height, data, **(options[:blurhash] || {}))
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@file
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rescue Vips::Error => e
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raise Paperclip::Error, "Error while generating blurhash for #{@basename}: #{e}"
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end
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private
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def blurhash_params
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if Rails.configuration.x.use_vips
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image = Vips::Image.thumbnail(@file.path, 100)
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[image.width, image.height, image.colourspace(:srgb).extract_band(0, n: 3).to_a.flatten]
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else
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pixels = convert(':source -depth 8 RGB:-', source: File.expand_path(@file.path)).unpack('C*')
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geometry = options.fetch(:file_geometry_parser).from_file(@file)
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[geometry.width, geometry.height, pixels]
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end
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end
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end
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end
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