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# frozen_string_literal: true
require_relative 'shell_helper'
module Booru
module ImageProcessing
class JpegProcessor < Processor
include ShellHelper
def pre_process
write_log 'pre_process'
# Perform lossy rotation on image if it has EXIF orientation field
# (web browsers do not respect that, see http://caniuse.com/#search=image-orientation)
image = ::MiniMagick::Image.open(@original_path)
orientation = image.exif['Orientation']
if orientation.to_i > 1 # 1 is the default orientation
write_log 'Auto-oriented JPEG.'
image.auto_orient
image.strip # remove EXIF metadata to prevent image from being rotated again
image.write(@original_path)
end
end
def generate_version(dimensions, destination_path)
write_log "generate_version #{dimensions} #{destination_path}"
width, height = dimensions
# resize JPEG to desired size and jpegtran the resized version.
::MiniMagick::Tool::Convert.new do |cmd|
cmd.resize "#{width}x#{height}"
cmd << @original_path
cmd << destination_path
end
jpegtran(destination_path)
end
def post_process
write_log 'post_process'
jpegtran(@original_path)
end
end
end
end
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