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Contents
# encoding: utf-8
module DynamicImage
# = DynamicImage Metadata
#
# Parses metadata from an image. Expects to receive image data as a
# binary string.
class Metadata
def initialize(data)
@data = data
end
# Returns the color space of the image as a string. The result will be one
# of the following: "rgb", "cmyk", "gray".
def colorspace
if valid?
case metadata[:colorspace]
when /rgb/i
"rgb"
when /cmyk/i
"cmyk"
when /gray/i
"gray"
end
end
end
# Returns the content type of the image.
def content_type
if valid?
"image/#{format.downcase}"
end
end
# Returns the dimensions of the image as a vector.
def dimensions
if valid?
Vector2d.new(*metadata[:dimensions])
end
end
# Returns the width of the image.
def width
dimensions.try(:x)
end
# Returns the height of the image.
def height
dimensions.try(:y)
end
# Returns the format of the image.
def format
if valid?
metadata[:format]
end
end
# Returns true if the image is valid.
def valid?
@data && metadata != :invalid
end
private
def metadata
@metadata ||= read_metadata
end
def read_metadata
image = MiniMagick::Image.read(@data)
image.auto_orient
metadata = {
colorspace: image[:colorspace],
dimensions: image[:dimensions],
format: image[:format]
}
image.destroy!
metadata
rescue MiniMagick::Invalid
:invalid
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems