205 lines
5.8 KiB
HTML
205 lines
5.8 KiB
HTML
<!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 v4.1.0
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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>: v4.1.0<BR>
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<B>Previous Version</B>: <A HREF=v4.0.10.html>v4.0.10</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 describes the changes made to the software between the
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<I>previous</I> and <I>current</I> versions (see above). If you don't
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find something listed here, then it was not done in this timeframe, or
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it was not considered important enough to be mentioned. The following
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information is located here. A change summary is also provided by the
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ChangeLog file included in the release package and by the Git commit
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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>Make defer strile offset/bytecount loading available at runtime
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and add per-strile offset/bytecount loading capabilities. Part of
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this commit makes the behaviour that was previously met when libtiff
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was compiled with -DDEFER_STRILE_LOAD available for default builds
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when specifying the new 'D' (Deferred) TIFFOpen() flag. In that
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mode, the [Tile/Strip][ByteCounts/Offsets] arrays are only loaded
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when first accessed. This can speed-up the opening of files stored
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on the network when just metadata retrieval is needed.
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Another addition is the capability of loading only the values of
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the offset/bytecount of the strile of interest instead of the
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whole array. This is enabled with the new 'O' (Ondemand) flag of
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TIFFOpen() (which implies 'D').
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The public TIFFGetStrileOffset[WithErr]() and
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TIFFGetStrileByteCount[WithErr]() functions have been added to
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API. They are of particular interest when using sparse files (with
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offset == bytecount == 0) and you want to detect if a strile is
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present or not without decompressing the data, or updating an
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existing sparse file.
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</LI>
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<LI>The BigTIFF writer now optimizes file size by using 32-bit LONG
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values (rather than 64-bit) where it is reasonable and safe to do
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so. Likewise, the 16-bit SHORT type is used when possible for
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StripByteCounts/TileByteCounts.
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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="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 WIN32 build now uses tif_win32.c when building with CMake.</LI>
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<LI>Properly set value of HOST_FILLORDER to LSB2MSB for Windows
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CMake builds. It was not being properly set!</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>
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Changes in the libtiff library may be viewed on-line
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at <A HREF="https://gitlab.com/libtiff/libtiff/commits/master/libtiff">Libtiff
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Library Commits</A>.
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</LI>
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<LI>
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New function TIFFReadFromUserBuffer() which replaces the use of
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TIFFReadEncodedStrip()/TIFFReadEncodedTile() when the user can
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provide the buffer for the input data, for example when he wants
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to avoid libtiff to read the strile offset/count values from the
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[Strip|Tile][Offsets/ByteCounts] array.
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</LI>
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<LI>
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New functions TIFFDeferStrileArrayWriting() and TIFFForceStrileArrayWriting()
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Those advanced writing functions must be used in a particular sequence
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to make their intended effect. Their aim is to control when/where
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the [Strip/Tile][Offsets/ByteCounts] arrays are written into the file.
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The purpose of this is to generate 'cloud-optimized geotiff' files where
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the first KB of the file only contain the IFD entries without the potentially
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large strile arrays. Those are written afterwards.
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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>Changes in the libtiff utilities may be viewed on-line
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at <A HREF="https://gitlab.com/libtiff/libtiff/commits/master/tools">Libtiff
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Tools Commits</A></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>Changes in the libtiff contrib area may be viewed on-line
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at <A HREF="https://gitlab.com/libtiff/libtiff/commits/master/contrib">Libtiff
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Contrib Commits</A></LI>
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</UL>
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</BODY>
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</HTML>
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