Sha256: 74d9080e9176009f960843d7a8783b66fe1911077a62ddac1eba47fdb8964a5a
Contents?: true
Size: 1.49 KB
Versions: 21
Compression:
Stored size: 1.49 KB
Contents
require_relative 'exif_parser'
class FormatParser::ARWParser
include FormatParser::IOUtils
include FormatParser::EXIFParser
# Standard TIFF headers
MAGIC_LE = [0x49, 0x49, 0x2A, 0x0].pack('C4')
MAGIC_BE = [0x4D, 0x4D, 0x0, 0x2A].pack('C4')
HEADER_BYTES = [MAGIC_LE, MAGIC_BE]
ARW_MIME_TYPE = 'image/x-sony-arw'
def likely_match?(filename)
filename =~ /\.arw$/i
end
def call(io)
io = FormatParser::IOConstraint.new(io)
return unless HEADER_BYTES.include?(safe_read(io, 4))
exif_data = exif_from_tiff_io(io)
return unless valid?(exif_data)
w = exif_data.width || exif_data.pixel_x_dimension
h = exif_data.height || exif_data.pixel_y_dimension
FormatParser::Image.new(
format: :arw,
width_px: w,
height_px: h,
display_width_px: exif_data.rotated? ? h : w,
display_height_px: exif_data.rotated? ? w : h,
orientation: exif_data.orientation_sym,
intrinsics: { exif: exif_data },
content_type: ARW_MIME_TYPE,
)
rescue EXIFR::MalformedTIFF
nil
end
def valid?(exif_data)
# taken directly from tiff_parser.rb
# Similar to how exiftool determines the image type as ARW, we are implementing a check here
# https://github.com/exiftool/exiftool/blob/e969456372fbaf4b980fea8bb094d71033ac8bf7/lib/Image/ExifTool/Exif.pm#L929
exif_data.compression == 6 && exif_data.new_subfile_type == 1 && exif_data.make&.start_with?('SONY')
end
FormatParser.register_parser new, natures: :image, formats: :arw
end
Version data entries
21 entries across 21 versions & 1 rubygems