Added Sigma 35mm/1.4 to lens id 368 and changed resolver to look at both focal length and aperture. Fixed canonEv so lenses with f/6.3 report as f/6.3 (they actually report f/6.2 to camera)
On Canon bodies and lens firmware 1.x, this lens identifies itself using
model number 150. Starting with firmware 2.x, this lens now identifies
itself using model number 368.
Exiv2 was correctly identifying the former but not the latter.
This commit also fixes a pre-existing bug in which exiv2 was not
correctly disambiguating lenses using model number 368.
This PR (and fix981_canonAutoFocus2) use a decoder listed in TiffMappingInfo to
decode Exif.Canon.AFInfo. The decoding function "manufactures" Exif tags such as
Exif.Canon.AFNumPoints from the data in Exif.Canon.AFInfo. These tags must never
be written to file and are removed from the metadata in
exif.cpp/ExifParser::encode().
Three of the tags created (AFPointsInFocus,AFPointsSelected, AFPrimaryPoint) are
bitmasks. As the camera can have up to 64 focus points, the tags are a 64 bit
mask to say which points are active. The function printBitmask() reports data
such as 1,2,3 or (none).
This decoding function decodeCanonAFInfo() added to TiffMappingInfo manufactures
the new tags. Normally, tags are processed by the binary tag decoder and that
approach was taken in branch fix981_canonAf. However, the binary tag decoder
cannot deal with AFInfo because the size of some metadata arrays cannot be
determined at compile time.
Rosen Penev
Luis Díaz Más
Robin Mills
czgnp
Alex Esseling
Leonardo Brondani Schenkel
dbeichl
derselbst
Alexander Steffen
Daniel Zucchetto