Changes for 4.2.0 release
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Bob Friesenhahn
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7ec02eaa81
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html/v4.2.0.html
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html/v4.2.0.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML>
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<HEAD>
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<TITLE>
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Changes in TIFF v4.2.0
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</TITLE>
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<STYLE TYPE="text/css">
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body {
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font-family: Helvetica, Arial, Sans;
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}
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table, th, td {
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border: 1px solid black;
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border-collapse: collapse;
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}
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th, td {
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padding: 8pt;
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text-align: center;
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}
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th {
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text-align: center;
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}
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td {
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text-align: center;
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}
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ul li {
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padding: 3pt;
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}
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ul.a {
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list-style-type: circle;
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}
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ul.b {
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list-style-type: square;
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}
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ol.c {
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list-style-type: upper-roman;
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}
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ol.d {
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list-style-type: lower-alpha;
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}
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hr {
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width: 65%;
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}
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</STYLE>
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</HEAD>
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<BODY BGCOLOR=white>
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<BASEFONT SIZE=4>
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<B><FONT SIZE="+3">T</FONT>IFF <FONT SIZE="+2">C</FONT>HANGE <FONT SIZE="+2">I</FONT>NFORMATION</B>
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<BASEFONT SIZE=3>
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<div style="margin-left: 3em">
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<HR SIZE=4 ALIGN=left>
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<B>Current Version</B>: v4.2.0<BR>
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<B>Previous Version</B>: <A HREF=v4.1.0.html>v4.1.0</a><BR>
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<B>Master Download Site</B>: <A HREF="https://download.osgeo.org/libtiff">
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download.osgeo.org</a>, directory pub/libtiff<<BR>
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<B>Master HTTP Site #1</B>: <A HREF="http://www.simplesystems.org/libtiff/">
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http://www.simplesystems.org/libtiff/</a><BR>
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<B>Master HTTP Site #2</B>: <A HREF="http://libtiff.maptools.org/">
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http://libtiff.maptools.org/</a>
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<HR SIZE=4 ALIGN=left>
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</div>
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<P>
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This document provides a summary of significant changes made to the
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software between the <I>previous</I> and <I>current</I> versions (see
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above). A fully-detailed change summary is provided by the ChangeLog file
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included in the release package and by the Git commit history:
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<UL>
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<LI><A HREF="#highlights">Major Changes</A>
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<LI><A HREF="#configure">Changes in the software configuration</A>
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<LI><A HREF="#libtiff">Changes in libtiff</A>
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<LI><A HREF="#tools">Changes in the tools</A>
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<LI><A HREF="#contrib">Changes in the contrib area</A>
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</UL>
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<p>
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<P><HR ALIGN=left>
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<!-- ============================================================= -->
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<A NAME="highlights"><B><FONT SIZE="+3">M</FONT>AJOR CHANGES:</B></A>
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<UL>
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<LI>Optional support for using libdeflate is added.</LI>
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<LI>Many of the tools now support a memory usage limit.</LI>
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</UL>
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<P><HR ALIGN=left>
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<!-- ============================================================= -->
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<A NAME="configure"><B><FONT SIZE="+3">C</FONT>HANGES IN THE SOFTWARE CONFIGURATION:</B></A>
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<UL>
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<LI>The Microsoft Windows 'nmake' build is resuscitated and provides
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a default HAVE_STRTOLL setting in 'nmake.opt' which is suitable for
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MSVC++ 14.0 ("Visual Studio 2015") and later but may be disabled in
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order to compile with earlier compiler versions.</LI>
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<LI>mingw-w64 cmake build fixes to not add libm</LI>
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</UL>
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<P><HR ALIGN=left>
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<!-- ============================================================= -->
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<A NAME="libtiff"><B><FONT SIZE="+3">C</FONT>HANGES IN LIBTIFF:</B></A>
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<UL>
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<LI>A great many issues discovered by fuzzers (via oss-fuzz and other reports) have been addressed.</LI>
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<LI>EXIF 2.32 and GPS tags and functionality have been upgraded:
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<UL>
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<LI>Existing EXIF field definition of tags are upgraded to EXIF version 2.3.2</LI>
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<LI>EXIF-GPS structure, tags and access functions are added as special CustomDirectory (like it was done for EXIF).</LI>
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<LI>Reading error for FileSource and SceneType tags corrected.</LI>
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</UL>
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<LI>Make TIFFTAG_CFAPATTERN variable count.</LI>
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<LI>Cmake configuration fixes for big-endian targets.</LI>
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<LI>Added support for optional building against libdeflate for
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faster Zip/Deflate compression/decompression. We now have 2 kinds of
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builds with the Zip/Deflate codec:
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<UL>
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<LI>zlib only</LI>
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<LI>zlib + libdeflate</LI>
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</UL>
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<P>Speed improvements in the 35%-50% range can be expected when libdeflate is used.
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Compression level up to 12 is now supported (capped to 9 when zlib is used).
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Still requires zlib for situations where libdeflate cannot be used (that
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is for scanline access, since libdeflate has no streaming mode)</P>
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<P>Pseudo-tag TIFFTAG_DEFLATE_SUBCODEC=DEFLATE_SUBCODEC_ZLIB/DEFLATE_SUBCODEC_LIBDEFLATE
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is added to control which subcodec (zlib or libdeflate) should be used (it defaults
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of course to libdeflate, when it is available).
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This is mostly aimed at being used on the writing side, to be able to reproduce
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output of previous libtiff versions at a binary level, in situations where this would
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be really needed. Or as a safety belt in case there would be unforeseen issues
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with using libdeflate.
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It can be used to know when libdeflate is available at runtime (DEFLATE_SUBCODEC_LIBDEFLATE
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will be the default value in that situation).</P>
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<P>Of course, deflate codestreams produced by libdeflate can be read by zlib, and vice-versa.</P>
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</LI>
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</UL>
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<P><HR ALIGN=left>
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<!-- ============================================================= -->
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<A NAME="tools"><B><FONT SIZE="+3">C</FONT>HANGES IN THE TOOLS:</B></A>
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<UL>
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<LI>A great many issues discovered by fuzzers (via oss-fuzz and other reports) have been addressed.</LI>
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<LI>ppm2tiff: support any bps value from 1 to 16.</LI>
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<LI>tiff2ps, tiff2rgba: A default memory limit is now enforced (256MiB) and a '-M' option is added to allow the user to adjust the limit.</LI>
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<LI>tiff2pdf, tiffcp: A default memory limit is now enforced (256MiB) and a '-m' option is added to allow the user to adjust the limit.</LI>
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<LI>tiffcrop: A default memory limit is now enforced (256MiB) and a '-k' option is added to allow the user to adjust the limit.</LI>
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<LI>tiff2pdf: fix "raw" copy of Deflate streams.</LI>
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<LI>tiff2pdf.c: properly calculate datasize when saving to JPEG YCbCr</LI>
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<LI>tiffcp: disable strip chopping when trying to convert to JBIG compression</LI>
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</UL>
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<P><HR ALIGN=left>
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<!-- ============================================================= -->
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<A NAME="contrib"><B><FONT SIZE="+3">C</FONT>HANGES IN THE CONTRIB AREA:</B></A>
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<UL>
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<LI>None</LI>
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</UL>
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</BODY>
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</HTML>
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