Sha256: 020207be42869ae19b33aa672edad010a13d27eafe14757adec8a9b582a59686
Contents?: true
Size: 2 KB
Versions: 7
Compression:
Stored size: 2 KB
Contents
module IIIFManifest
module V3
class ManifestBuilder
class ThumbnailBuilder
attr_reader :display_content, :iiif_thumbnail_factory, :image_service_builder_factory
def initialize(display_content, iiif_thumbnail_factory:, image_service_builder_factory:)
@display_content = display_content
@iiif_thumbnail_factory = iiif_thumbnail_factory
@image_service_builder_factory = image_service_builder_factory
end
# @return [Array<Object>]
def build
return Array(display_content.thumbnail.map(&:stringify_keys)) unless display_content.thumbnail.nil?
return nil if display_content.type != "Image" || iiif_endpoint.nil?
build_thumbnail
image_service_builder.apply(thumbnail)
[thumbnail]
end
private
def build_thumbnail
thumbnail['id'] = File.join(
display_content.iiif_endpoint.url,
'full',
"!#{max_edge},#{max_edge}",
'0',
'default.jpg'
)
thumbnail['type'] = display_content.type
thumbnail['height'] = (display_content.height * reduction_ratio).round
thumbnail['width'] = (display_content.width * reduction_ratio).round
thumbnail['format'] = display_content.format
end
def reduction_ratio
width = display_content.width
height = display_content.height
max_edge = @max_edge.to_f
return 1 if width <= max_edge && height <= max_edge
long_edge = [height, width].max
max_edge / long_edge
end
def max_edge
@max_edge = ::IIIFManifest.config.max_edge_for_thumbnail
end
def thumbnail
@thumbnail ||= iiif_thumbnail_factory.new
end
def iiif_endpoint
display_content.try(:iiif_endpoint)
end
def image_service_builder
image_service_builder_factory.new(iiif_endpoint)
end
end
end
end
end
Version data entries
7 entries across 7 versions & 2 rubygems