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32 lines
1.2 KiB
32 lines
1.2 KiB
# 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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