Changes in TIFF v3.8.0
======================

.. table:: References
  :widths: auto

  ======================  ==========================================
  Current Version         v3.8.0 (:tag:`Release-v3-8-0`)
  Previous Version        :doc:`v3.7.4 <v3.7.4>`
  Master Download Site    `<https://download.osgeo.org/libtiff/>`_
  Master HTTP Site        `<http://www.simplesystems.org/libtiff/>`_
  ======================  ==========================================

This document describes the changes made to the software between the
*previous* and *current* versions (see above).
If you don't find something listed here, then it was not done in this
timeframe, or it was not considered important enough to be mentioned.
The following information is located here:

Major changes
-------------

* Read-only support for custom directories (e.g. EXIF directory).

* Preliminary support for MS MDI format.


Software configuration changes
------------------------------

* Make the default strip size configurable via the
  ``--with-default-strip-size`` and :c:macro:`STRIP_SIZE_DEFAULT` options.


Library changes
---------------

* :file:`tiffio.h`: Added :c:macro:`VC_EXTRALEAN` definition before including
  :file:`windows.h`, to reduce the compile time.

* :file:`tif_jpeg.c`: Improve compilation under MinGW.

* :file:`tif_aux.c`, :file:`tif_dir.c`, :file:`tif_dir.h`, :file:`tif_dirwrite.c`,
  :file:`tif_print.c`, :file:`tif_getimage.c`: Make ``InkSet``, ``NumberOfInks``, ``DotRange`` and
  ``StoNits`` tags custom.

* :file:`tif_aux.c`, :file:`tif_dir.c`, :file:`tif_dir.h`, :file:`tif_print.c`: Make
  ``WhitePoint`` tag custom.

* :file:`tiffio.h`: fixed typo that potentially resulted in
  redefininition of :c:macro:`USE_WIN32_FILEIO`

* :file:`tif_dir.c`, :file:`tif_dir.h`, :file:`tif_print.c`: Make ``RichTIFFIPTC``,
  ``Photoshop`` and ``ICCProfile`` tags custom.

* :file:`libtiff/*`, :file:`contrib/*`: Added 'dual-mode' error handling, enabling
  newer code to get context indicator in error handler and still
  remain compatible with older code: Done :c:func:`TIFFError` calls everywhere
  except in tools.

* :file:`tiffinfo.c`: Print ``EXIF`` directory contents if exist.

* :file:`tif_dirinfo.c`, :file:`tif_dirread.c`, :file:`tif_dir.h`, :file:`tif_dir.c`:
  Custom directory read-only support.

* :file:`tif_aux.c`, :file:`tif_dirinfo.c`, :file:`tif_dirread.c`, :file:`tif_dir.h`,
  :file:`tif_dir.c`, :file:`tif_print.c`: Make ``YCbCrCoefficients`` and ``ReferenceBlackWhite``
  tags custom.

* :file:`tif_dirread.c`: One more workaround for broken ``StripByteCounts``
  tag. Handle the case when ``StripByteCounts`` array filled with
  completely wrong values.

* :file:`tif_dirinfo.c`: Release file descriptor in case of failure
  in the :c:func:`TIFFOpenW` function as per bug
  :bugzilla-rs:`1003`

* :file:`tif_dirinfo.c`: Correctly use :c:func:`bsearch` and :c:func:`lfind`
  functions as per bug
  :bugzilla-rs:`1008`

* :file:`tif_open.c`, :file:`tiff.h`, :file:`tiffdump.c`: Incorporate preliminary support
  for MS MDI format.
  :bugzilla-rs:`1002`

* libtiff.def, :file:`tiffiop.h`, :file:`tiffio.h`: Made :c:func:`TIFFFreeDirectory`
  public.

* :file:`/tif_dirinfo.c`: Make ``XResolution``, ``YResolution`` and
  ``ResolutionUnit`` tags modifiable during write process. As per bug
  :bugzilla-rs:`977`

* :file:`if_dirread.c`: Don't try and split single strips into "0" strips
  in :c:func:`ChopUpSingleUncompressedStrip`.  This happens in some degenerate
  cases (like 1×1 files with ``stripbytecounts==0`` (:file:`gtsmall.jp2` embed tiff)

* :file:`tif_fax3.c`: changed '`at scanline ...`' style warning/errors
  with incorrect use of tif_row, to '`at line ... of
  strip/tile ...`' style.


Tools changes
-------------

* :file:`tiffcp.c`: Added many error reporting messages; fixed integer
  overflow as per bug
  :bugzilla-rs:`789`

* :file:`tiffcp.c`: Return non-zero status when reading fails.

* :file:`fax2tiff.c`: Properly calculate sizes of temporary arrays
  as per bug
  :bugzilla-rs:`943`

* :file:`fax2tiff.c`: Added option `-r` to set RowsPerStrip parameter
  as per bug
  :bugzilla-rs:`944`

* :file:`tiffdump.c`: Fixed :c:var:`typeshift` and :c:var:`typemask` arrays initialization
  problem as per bug
  :bugzilla-rs:`946`

* :file:`bmp2tiff.c`: Fixed possible integer overflow error as per bug
  :bugzilla-rs:`965`

* :file:`tiffsplit.c`: Copy fax related fields over split parts
  as per bug
  :bugzilla-rs:`983`

* :file:`tiffdump.c`: Fixed crash when reading malformed tags.

* :file:`tiff2pdf.c`: Added missed ``break`` statement as per bug
  :bugzilla-rs:`932`


Contributed software changes
----------------------------

* :file:`contrib/addtiffo/*`: Major upgrade by Joris to support subsampled
  YCbCr images in jpeg compressed TIFF files.