Class: FormatParser::RW2Parser

Inherits:
Object
  • Object
show all
Includes:
EXIFParser, IOUtils
Defined in:
lib/parsers/rw2_parser.rb

Constant Summary collapse

PANASONIC_RAW_MIMETYPE = 
'image/x-panasonic-raw'
RW2_MAGIC_BYTES = 
[0x49, 0x49, 0x55, 0x0, 0x18, 0x0, 0x0, 0x0].pack('C8')
RAW_RWL_MAGIC_BYTES = 
[0x49, 0x49, 0x55, 0x0, 0x08, 0x0, 0x0, 0x0].pack('C8')
MAGIC_BYTES = 
[RW2_MAGIC_BYTES, RAW_RWL_MAGIC_BYTES]
BORDER_TAG_IDS = 
{
  top: 4,
  left: 5,
  bottom: 6,
  right: 7
}

Constants included from EXIFParser

EXIFParser::ORIENTATIONS

Constants included from IOUtils

IOUtils::INTEGER_DIRECTIVES

Instance Method Summary collapse

Methods included from EXIFParser

#exif_from_tiff_io

Methods included from IOUtils

#read_bytes, #read_fixed_point, #read_int, #safe_read, #safe_skip, #skip_bytes

Instance Method Details

#call(io) ⇒ Object 



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# File 'lib/parsers/rw2_parser.rb', line 22

def call(io)
  @buf = FormatParser::IOConstraint.new(io)

  return unless matches_rw2_definition?

  @buf.seek(0)
  exif = exif_from_tiff_io(@buf)
  return unless exif

  # RW2 doesn't use the standard EXIF width and height tags (🤷🏻). We can compute them from the sensor
  # top/bottom/left/right border tags. See https://exiftool.org/TagNames/PanasonicRaw.html for more.
  left_sensor_border = sensor_border(exif, :left)
  right_sensor_border = sensor_border(exif, :right)
  w = right_sensor_border - left_sensor_border if left_sensor_border && right_sensor_border

  top_sensor_border = sensor_border(exif, :top)
  bottom_sensor_border = sensor_border(exif, :bottom)
  h = bottom_sensor_border - top_sensor_border if top_sensor_border && bottom_sensor_border

  FormatParser::Image.new(
    format: :rw2,
    width_px: w,
    height_px: h,
    display_width_px: exif.rotated? ? h : w,
    display_height_px: exif.rotated? ? w : h,
    orientation: exif.orientation_sym,
    intrinsics: { exif: exif },
    content_type: PANASONIC_RAW_MIMETYPE,
  )
rescue EXIFR::MalformedTIFF
  nil
end

#likely_match?(filename) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/parsers/rw2_parser.rb', line 18

def likely_match?(filename)
  /\.(rw2|raw|rwl)$/i.match?(filename)
end