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