Sha256: bef0a2693f03291ea9c61ff49392cc9ad9c4ae141939bf07fe2028a31310be1a
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Size: 1.92 KB
Versions: 12
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Stored size: 1.92 KB
Contents
require_relative 'exif_parser'
class FormatParser::RW2Parser
include FormatParser::IOUtils
include FormatParser::EXIFParser
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
}
def likely_match?(filename)
/\.(rw2|raw|rwl)$/i.match?(filename)
end
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
private
def matches_rw2_definition?
MAGIC_BYTES.include?(read_bytes(8))
end
def sensor_border(exif, border)
exif[0]&.raw_fields&.[](BORDER_TAG_IDS[border])&.[](0)
end
FormatParser.register_parser new, natures: [:image], formats: [:rw2]
end
Version data entries
12 entries across 12 versions & 1 rubygems