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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html>
+<head>
+<title>History of Ghostscript versions 1.n</title>
+<!-- $Id: History2.htm,v 1.13.2.11.2.6 2003/05/17 14:38:59 giles Exp $ -->
+<!-- Originally: history2.txt -->
+<!--
+ WARNING: do not use Pete Kaiser's emacs function "gs-toc" alone to
+ re-create the table of contents here, because it will replace the
+ hand-edited TOC subheads with a separate subhead for each H2 in
+ the body of the file. Or if you do, first look at the original
+ TOC to see how to edit it for visual conciseness.
+-->
+<link rel="stylesheet" type="text/css" href="gs.css" title="Ghostscript Style">
+</head>
+
+<body>
+<!-- [1.0 begin visible header] ============================================ -->
+
+<!-- [1.1 begin headline] ================================================== -->
+
+<h1>History of Ghostscript versions 2.n</h1>
+
+<!-- [1.1 end headline] ==================================================== -->
+
+<!-- [1.2 begin table of contents] ========================================= -->
+
+<h2>Table of contents</h2>
+
+<blockquote><ul>
+<li><a href="#Version2.9.10b">Version 2.9.10-beta (7/28/94)</a>
+<ul>
+<li><a href="#V2.9.10b_Documentation">Documentation</a>,
+ <a href="#V2.9.10b_Procedures">Procedures</a>,
+ <a href="#V2.9.10b_Utilities">Utilities</a>,
+ <a href="#V2.9.10b_Drivers">Drivers</a>,
+ <a href="#V2.9.10b_Platforms">Platforms</a>,
+ <a href="#V2.9.10b_Fonts">Fonts</a>,
+ <a href="#V2.9.10b_Interpreter">Interpreter</a>,
+ <a href="#V2.9.10b_Streams">Streams</a>,
+ <a href="#V2.9.10b_Library">Library</a>
+</ul>
+<li><a href="#Version2.9.9b">Version 2.9.9-beta (6/23/94)</a>
+<ul>
+<li><a href="#V2.9.9b_Documentation">Documentation</a>,
+ <a href="#V2.9.9b_Platforms">Platforms</a>,
+ <a href="#V2.9.9b_Fonts">Fonts</a>,
+ <a href="#V2.9.9b_Interpreter">Interpreter</a>,
+ <a href="#V2.9.9b_Library">Library</a>
+</ul>
+<li><a href="#Version2.9.8">Version 2.9.8 (6/20/94)</a>
+<ul>
+<li><a href="#V2.9.8_Documentation">Documentation</a>,
+ <a href="#V2.9.8_Procedures">Procedures</a>,
+ <a href="#V2.9.8_Utilities">Utilities</a>,
+ <a href="#V2.9.8_Drivers">Drivers</a>,
+ <a href="#V2.9.8_Platforms">Platforms</a>,
+ <a href="#V2.9.8_Fonts">Fonts</a>,
+ <a href="#V2.9.8_Interpreter">Interpreter</a>,
+ <a href="#V2.9.8_Library">Library</a>
+</ul>
+<li><a href="#Version2.9.7b">Version 2.9.7-beta (6/5/94)</a>
+<ul>
+<li><a href="#V2.9.7b_Documentation">Documentation</a>,
+ <a href="#V2.9.7b_Procedures">Procedures</a>,
+ <a href="#V2.9.7b_Utilities">Utilities</a>,
+ <a href="#V2.9.7b_Drivers">Drivers</a>,
+ <a href="#V2.9.7b_Platforms">Platforms</a>,
+ <a href="#V2.9.7b_Fonts">Fonts</a>,
+ <a href="#V2.9.7b_Interpreter">Interpreter</a>,
+ <a href="#V2.9.7b_Library">Library</a>
+</ul>
+<li><a href="#Version2.9.6b">Version 2.9.6-beta (5/23/94, not distributed to the public)</a>
+<ul>
+<li><a href="#V2.9.6b_Documentation">Documentation</a>,
+ <a href="#V2.9.6b_Procedures">Procedures</a>,
+ <a href="#V2.9.6b_Utilities">Utilities</a>,
+ <a href="#V2.9.6b_Drivers">Drivers</a>,
+ <a href="#V2.9.6b_Platforms">Platforms</a>,
+ <a href="#V2.9.6b_Fonts">Fonts</a>,
+ <a href="#V2.9.6b_Interpreter">Interpreter</a>,
+ <a href="#V2.9.6b_Library">Library</a>
+</ul>
+<li><a href="#Version2.9.5b">Version 2.9.5-beta (4/11/94)</a>
+<ul>
+<li><a href="#V2.9.5b_Documentation">Documentation</a>,
+ <a href="#V2.9.5b_Procedures">Procedures</a>,
+ <a href="#V2.9.5b_Utilities">Utilities</a>,
+ <a href="#V2.9.5b_Drivers">Drivers</a>,
+ <a href="#V2.9.5b_Platforms">Platforms</a>,
+ <a href="#V2.9.5b_Interpreter">Interpreter</a>,
+ <a href="#V2.9.5b_Library">Library</a>
+</ul>
+<li><a href="#Version2.9.4b">Version 2.9.4-beta (2/19/94)</a>
+<ul>
+<li><a href="#V2.9.4b_Procedures">Procedures</a>,
+ <a href="#V2.9.4b_Utilities">Utilities</a>,
+ <a href="#V2.9.4b_Drivers">Drivers</a>,
+ <a href="#V2.9.4b_Platforms">Platforms</a>,
+ <a href="#V2.9.4b_Interpreter">Interpreter</a>,
+ <a href="#V2.9.4b_Library">Library</a>
+</ul>
+<li><a href="#Version2.9.3b">Version 2.9.3-beta (1/19/94)</a>
+<ul>
+<li><a href="#V2.9.3b_Documentation">Documentation</a>,
+ <a href="#V2.9.3b_Procedures">Procedures</a>,
+ <a href="#V2.9.3b_Drivers">Drivers</a>,
+ <a href="#V2.9.3b_Platforms">Platforms</a>,
+ <a href="#V2.9.3b_Interpreter">Interpreter</a>,
+ <a href="#V2.9.3b_Library">Library</a>
+</ul>
+<li><a href="#Version2.9.2b">Version 2.9.2-beta (1/2/94)</a>
+<ul>
+<li><a href="#V2.9.2b_Documentation">Documentation</a>,
+ <a href="#V2.9.2b_Utilities">Utilities</a>,
+ <a href="#V2.9.2b_Drivers">Drivers</a>,
+ <a href="#V2.9.2b_Platforms">Platforms</a>,
+ <a href="#V2.9.2b_Fonts">Fonts</a>,
+ <a href="#V2.9.2b_Interpreter">Interpreter</a>,
+ <a href="#V2.9.2b_Library">Library</a>
+</ul>
+<li><a href="#Version2.9.1b">Version 2.9.1-beta (12/7/93)</a>
+<ul>
+<li><a href="#V2.9.1b_Utilities">Utilities</a>,
+ <a href="#V2.9.1b_Interpreter">Interpreter</a>,
+ <a href="#V2.9.1b_Library">Library</a>
+</ul>
+<li><a href="#Version2.9b">Version 2.9-beta (12/6/93)</a>
+<ul>
+<li><a href="#V2.9b_Documentation">Documentation</a>,
+ <a href="#V2.9b_Procedures">Procedures</a>,
+ <a href="#V2.9b_Utilities">Utilities</a>,
+ <a href="#V2.9b_Drivers">Drivers</a>,
+ <a href="#V2.9b_Platforms">Platforms</a>,
+ <a href="#V2.9b_Interpreter">Interpreter</a>,
+ <a href="#V2.9b_Library">Library</a>
+</ul>
+<li><a href="#Version2.8b">Version 2.8-beta (11/10/93)</a>
+<ul>
+<li><a href="#V2.8b_Documentation">Documentation</a>,
+ <a href="#V2.8b_Procedures">Procedures</a>,
+ <a href="#V2.8b_Utilities">Utilities</a>,
+ <a href="#V2.8b_Drivers">Drivers</a>,
+ <a href="#V2.8b_Platforms">Platforms</a>,
+ <a href="#V2.8b_Fonts">Fonts</a>,
+ <a href="#V2.8b_Interpreter">Interpreter</a>,
+ <a href="#V2.8b_Library">Library</a>
+</ul>
+<li><a href="#Version2.7.2b">Version 2.7.2-beta (10/11/93)</a>
+<ul>
+<li><a href="#V2.7.2b_Utilities">Utilities</a>,
+ <a href="#V2.7.2b_Interpreter">Interpreter</a>,
+ <a href="#V2.7.2b_Library">Library</a>
+</ul>
+<li><a href="#Version2.7.1b">Version 2.7.1-beta (10/4/93, not distributed to the public)</a>
+<ul>
+<li><a href="#V2.7.1b_Documentation">Documentation</a>,
+ <a href="#V2.7.1b_Utilities">Utilities</a>,
+ <a href="#V2.7.1b_Drivers">Drivers</a>,
+ <a href="#V2.7.1b_Platforms">Platforms</a>,
+ <a href="#V2.7.1b_Fonts">Fonts</a>,
+ <a href="#V2.7.1b_Interpreter">Interpreter</a>,
+ <a href="#V2.7.1b_Library">Library</a>
+</ul>
+<li><a href="#Version2.7b">Version 2.7-beta (9/20/93, not distributed to the public)</a>
+<ul>
+<li><a href="#V2.7b_Documentation">Documentation</a>,
+ <a href="#V2.7b_Procedures">Procedures</a>,
+ <a href="#V2.7b_Utilities">Utilities</a>,
+ <a href="#V2.7b_Drivers">Drivers</a>,
+ <a href="#V2.7b_Platforms">Platforms</a>,
+ <a href="#V2.7b_Fonts">Fonts</a>,
+ <a href="#V2.7b_Interpreter">Interpreter</a>,
+ <a href="#V2.7b_Library">Library</a>
+</ul>
+<li><a href="#Version2.6.1">Version 2.6.1 (5/28/93)</a>
+<ul>
+<li><a href="#V2.6.1_Documentation">Documentation</a>,
+ <a href="#V2.6.1_Procedures">Procedures</a>,
+ <a href="#V2.6.1_Utilities">Utilities</a>,
+ <a href="#V2.6.1_Drivers">Drivers</a>,
+ <a href="#V2.6.1_Platforms">Platforms</a>,
+ <a href="#V2.6.1_Fonts">Fonts</a>,
+ <a href="#V2.6.1_Interpreter">Interpreter</a>,
+ <a href="#V2.6.1_Library">Library</a>
+</ul>
+<li><a href="#Version2.6">Version 2.6 (5/9/93)</a>
+<ul>
+<li><a href="#V2.6_Documentation">Documentation</a>,
+ <a href="#V2.6_Procedures">Procedures</a>,
+ <a href="#V2.6_Utilities">Utilities</a>,
+ <a href="#V2.6_Platforms">Platforms</a>,
+ <a href="#V2.6_Fonts">Fonts</a>,
+ <a href="#V2.6_Drivers">Drivers</a>,
+ <a href="#V2.6_Interpreter">Interpreter</a>,
+ <a href="#V2.6_Library">Library</a>
+</ul>
+<li><a href="#Version2.5.2">Version 2.5.2 (9/20/92)</a>
+<ul>
+<li><a href="#V2.5.2_Procedures">Procedures</a>,
+ <a href="#V2.5.2_Utilities">Utilities</a>,
+ <a href="#V2.5.2_Platforms">Platforms</a>,
+ <a href="#V2.5.2_Drivers">Drivers</a>,
+ <a href="#V2.5.2_Interpreter">Interpreter</a>,
+ <a href="#V2.5.2_Library">Library</a>
+</ul>
+<li><a href="#Version2.5.1">Version 2.5.1 (9/11/92)</a>
+<ul>
+<li><a href="#V2.5.1_Procedures">Procedures</a>,
+ <a href="#V2.5.1_Utilities">Utilities</a>,
+ <a href="#V2.5.1_Platforms">Platforms</a>,
+ <a href="#V2.5.1_Fonts">Fonts</a>,
+ <a href="#V2.5.1_Drivers">Drivers</a>,
+ <a href="#V2.5.1_Interpreter">Interpreter</a>,
+ <a href="#V2.5.1_Library">Library</a>
+</ul>
+<li><a href="#Version2.5">Version 2.5 (8/18/92)</a>
+<ul>
+<li><a href="#V2.5_Procedures">Procedures</a>,
+ <a href="#V2.5_Utilities">Utilities</a>,
+ <a href="#V2.5_Platforms">Platforms</a>,
+ <a href="#V2.5_Fonts">Fonts</a>,
+ <a href="#V2.5_Drivers">Drivers</a>,
+ <a href="#V2.5_Interpreter">Interpreter</a>,
+ <a href="#V2.5_Library">Library</a>
+</ul>
+<li><a href="#Version2.4.2">Version 2.4.2 (5/8/92)</a>
+<ul>
+<li><a href="#V2.4.2_Procedures">Procedures</a>,
+ <a href="#V2.4.2_Utilities">Utilities</a>,
+ <a href="#V2.4.2_Platforms">Platforms</a>,
+ <a href="#V2.4.2_Fonts">Fonts</a>,
+ <a href="#V2.4.2_Drivers">Drivers</a>,
+ <a href="#V2.4.2_Interpreter">Interpreter</a>,
+ <a href="#V2.4.2_Library">Library</a>
+</ul>
+<li><a href="#Version2.4.1">Version 2.4.1 (4/21/92)</a>
+<ul>
+<li><a href="#V2.4.1_Procedures">Procedures</a>,
+ <a href="#V2.4.1_Utilities">Utilities</a>,
+ <a href="#V2.4.1_Drivers">Drivers</a>,
+ <a href="#V2.4.1_Fonts">Fonts</a>,
+ <a href="#V2.4.1_Interpreter">Interpreter</a>,
+ <a href="#V2.4.1_Library">Library</a>
+</ul>
+<li><a href="#Version2.4">Version 2.4 (3/25/92)</a>
+<ul>
+<li><a href="#V2.4_Procedures">Procedures</a>,
+ <a href="#V2.4_Utilities">Utilities</a>,
+ <a href="#V2.4_Drivers">Drivers</a>,
+ <a href="#V2.4_Fonts">Fonts</a>,
+ <a href="#V2.4_Interpreter">Interpreter</a>,
+ <a href="#V2.4_Library">Library</a>
+</ul>
+<li><a href="#Version2.3">Version 2.3 (8/28/91)</a>
+<ul>
+<li><a href="#V2.3_Utilities">Utilities</a>,
+ <a href="#V2.3_Drivers">Drivers</a>
+</ul>
+<li><a href="#Version2.2">Version 2.2 (6/1/91)</a>
+<ul>
+<li><a href="#V2.2_Procedures">Procedures</a>,
+ <a href="#V2.2_Drivers">Drivers</a>,
+ <a href="#V2.2_Fonts">Fonts</a>,
+ <a href="#V2.2_Utilities">Utilities</a>,
+ <a href="#V2.2_Interpreter">Interpreter</a>,
+ <a href="#V2.2_Library">Library</a>
+</ul>
+<li><a href="#Version2.1.1">Version 2.1.1 (1/15/91)</a>
+<ul>
+<li><a href="#V2.1.1_Build_procedures">Build procedures</a>,
+ <a href="#V2.1.1_Interpreter">Interpreter</a>,
+ <a href="#V2.1.1_Drivers">Drivers</a>,
+ <a href="#V2.1.1_Library">Library</a>
+</ul>
+<li><a href="#Version2.1">Version 2.1 (12/31/90)</a>
+<ul>
+<li><a href="#V2.1_Build_procedures">Build procedures</a>,
+ <a href="#V2.1_Drivers">Drivers</a>,
+ <a href="#V2.1_Fonts">Fonts</a>,
+ <a href="#V2.1_Interpreter">Interpreter</a>,
+ <a href="#V2.1_Library">Library</a>
+</ul>
+<li><a href="#Version2.0">Version 2.0 (9/12/90)</a>
+<ul>
+<li><a href="#V2.0_Miscellaneous">Miscellaneous</a>,
+ <a href="#V2.0_Drivers">Drivers</a>,
+ <a href="#V2.0_Build_procedures">Build procedures</a>,
+ <a href="#V2.0_Interpreter">Interpreter</a>,
+ <a href="#V2.0_Library">Library</a>
+</ul>
+</ul></blockquote>
+
+<!-- [1.2 end table of contents] =========================================== -->
+
+<!-- [1.3 begin hint] ====================================================== -->
+
+<p>
+This document is a history of Ghostscript releases numbered 2.n. For more
+recent changes, see the the other history documents and, for the latest
+versions, the new:
+
+<blockquote>
+<a href="News.htm">News</a><br>
+<a href="History4.htm">History of Ghostscript versions 4.n</a><br>
+<a href="History3.htm">History of Ghostscript versions 3.n</a><br>
+History of Ghostscript versions 2.n (this document)<br>
+<a href="History1.htm">History of Ghostscript versions 1.n</a>
+</blockquote>
+
+<p>For other information, see the <a href="Readme.htm">Ghostscript
+overview</a>.
+
+<!-- [1.3 end hint] ======================================================== -->
+
+<hr>
+
+<!-- [1.0 end visible header] ============================================== -->
+
+<h2><a name="Version2.9.10b"></a>Version 2.9.10-beta (7/28/94)</h2>
+
+<p>
+This is the last 2.9 beta, since 3.0 will be released on July 31.
+
+<h3><a name="V2.9.10b_Documentation"></a>Documentation</h3><pre>
+Fixes bugs:
+ - A | in gs.1 had a \ in front of it instead of \\.
+
+Adds a paragraph in gs.1 that tells how to select paper size.
+
+Notes in devs.mak that the cdj550 driver is the best one for the H-P
+DeskJet 520, and the pjxl300 driver is the right one for the H-P DeskJet
+1200C.
+
+Notes in make.doc that Watcom C++ 10.0 may require a change in a makefile.
+
+</pre><h3><a name="V2.9.10b_Procedures"></a>Procedures</h3><pre>
+Removes ICCINIT from MODULES.LIS for VMS systems.
+
+Updates VMS.MAK to support Motif V1.2.
+
+Updates jpeg.mak to work with version 5alpha4 of the IJG JPEG code.
+
+</pre><h3><a name="V2.9.10b_Utilities"></a>Utilities</h3><pre>
+Fixes bugs:
+ - font2c didn't leave extra room in Type 0 font dictionaries for
+entries added by definefont.
+ - font2c left extra information on the stack.
+ - ansi2knr would remove newline characters within formal argument
+lists.
+ - font2c got an Error: /undefined in makefontprocname.
+
+Updates ansi2knr to work better with the GNU configure program.
+
+Updates ansi2knr to handle procedure formal arguments automatically.
+
+</pre><h3><a name="V2.9.10b_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - If a file contained color or gray-scale information followed by a
+masked image, the X driver would sometimes invert the polarity of the
+image.
+
+</pre><h3><a name="V2.9.10b_Platforms"></a>Platforms</h3><pre>
+Fixes bugs:
+ - Unix systems with a 2-argument gettimeofday returned garbage
+values for the current time.
+ - The VMS build script for compiled fonts omitted the requirement
+to load gs_ccfnt.ps.
+ - memory_.h didn't note that System V Unix platforms need memmove.
+
+On Unix systems, changes the subdirectory of $datadir/ghostscript to just
+be the version number (e.g., 2.9.10 rather than gs-2.9.9).
+
+</pre><h3><a name="V2.9.10b_Fonts"></a>Fonts</h3><pre>
+Adds support code for the Wadalab (University of Tokyo) free Kanji font.
+
+Notes in the documentation in Fontmap that .pfa and .pfb fonts are
+compatible with ATM, but .gsf fonts are not.
+
+Changes the names of Thomas Wolff's expanded Hershey fonts, replacing .gsf
+with .pfa.
+
+</pre><h3><a name="V2.9.10b_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - The scanner became confused if the literal names /&lt;&lt; or /&gt;&gt;
+straddled an input buffer boundary.
+ - .setlanguagelevel gave an invalidaccess error when
+switching from level 2 to level 1.
+ - currentgstate, setgstate, and copy for gstates didn't do
+the necessary access checks.
+ - The Category resource category didn't define .ResourceFile, so
+/Category resourcestatus gave an error.
+ - The garbage collector didn't trace the structures used by
+filenameforall properly on most platforms.
+ - Automatically expanding systemdict didn't work, but didn't give
+an error.
+ - Automatically expanding a dictionary usually expanded it by too
+much.
+ - systemdict was created too small.
+ - The garbage collector didn't trace the structures referenced only
+from allocator objects, leading to attempts to access freed storage.
+ - If a chunk was empty, the GC tried to free it even if it had
+inner chunks.
+* - The outer loop in dict_find_name_by_index() could cause an
+addressing fault on segmented machines when looking up Level 2 operators,
+because the offset could get decremented past 0.
+ - The heap_available procedure in gsmemory.c didn't convert
+properly to non-ANSI syntax. (New bug in 2.9.9.)
+ - The ledgertray procedure wasn't implemented.
+ - The xxxtray procedures didn't set the page size.
+ - The settumble operator wasn't implemented, even as a dummy.
+ - glyphshow didn't work with Type 3 fonts.
+ - Supplying a RenderTable for a CIE color space caused an error.
+ - The DCT filter code had the jpeg/ subdirectory name "wired in" to
+the source files.
+
+Adds experimental filters for Burrows/Wheeler block sorting compression
+(BWBlockSortEncode/Decode), described in DEC SRC Research Report #124,
+move-to-front coding (MoveToFrontEncode/Decode), and a simple form of
+Huffman coding (BoundedHuffmanEncode/Decode). These are experimental -- do
+not rely on them remaining the same (or existing at all) in future
+releases!
+
+Adds all function prototypes needed to pacify strict compilers.
+
+Removes all explicit references to userdict from the C code.
+
+Changes the SAFER switch so that it disallows not only explicit writing,
+deleting, or renaming of files, but also disallows specifying an explicit
+OutputFile for any device (except for the initial device, by means of
+-sOutputFile= on the command line).
+
+</pre><h3><a name="V2.9.10b_Streams"></a>Streams</h3><pre>
+Fixes bugs:
+ - Hex decoding (ASCIIHexDecode stream and &lt;&gt; literals) didn't treat
+the data source as read-only (although it restored it to its original
+contents).
+
+Implements move-to-front coding, a simple form of Huffman coding, and
+Burrows/Wheeler block sorting compression.
+
+</pre><h3><a name="V2.9.10b_Library"></a>Library</h3><pre>
+Fixes bugs:
+* - (The following bug fix was actually implemented somewhere around
+version 2.7.) restore didn't purge character cache entries whose keys were
+names created more recently than the save.
+ - gstype1.h declared gs_type1_state_sizeof as an extern, but this
+wasn't defined anywhere.
+ - gs_makeimagedevice didn't set the size of the palette correctly,
+which confused the GC.
+ - gs_makeimagedevice didn't set num_components to 1 for
+mapped-color devices with only gray values.
+* - The two-color halftoning algorithms truncated when computing the
+halftone level, rather than rounding it.
+* - If a path being filled had line segments that fell entirely to
+the right of the clipping region, part of the path might not be filled.
+ - The optimized code for 24-bit color didn't ensure properly that
+32-bit accesses would be aligned appropriately.
+ - The miter join check had gotten reversed somewhere along the way.
+* - Because x and y were interchanged in the miter check computation,
+in some situations the check was inverted. (This is a very old bug!)
+ - It was believed that strokepath didn't work with dashed lines;
+the problem appears to have been an incorrect testing program.
+
+Adds all function prototypes needed to pacify strict compilers.
+
+Changes fixed2float so it doesn't cast the result to float, and removes
+fixed2double. This produces slightly more accurate results in many places,
+and may even be faster (for FPUs that normally generate double rather than
+single precision results).
+
+</pre>
+
+<h2><a name="Version2.9.9b"></a>Version 2.9.9-beta (6/23/94)</h2>
+
+<h3><a name="V2.9.9b_Documentation"></a>Documentation</h3><pre>
+Puts a pointer to devs.mak in the section of use.doc that talks about
+MS-DOS displays.
+
+</pre><h3><a name="V2.9.9b_Platforms"></a>Platforms</h3><pre>
+Fixes bugs:
+ - The %pipe% IODevice was omitted on System V platforms.
+ - The AXP VMS build script needed /NESTED_INCLUDE=PRIMARY in
+CC_QUAL to work around a bug in the DEC C compiler.
+
+</pre><h3><a name="V2.9.9b_Fonts"></a>Fonts</h3><pre>
+Fixes bugs:
+ - gs_lev2.ps redefined .loadFontmap incorrectly.
+
+</pre><h3><a name="V2.9.9b_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - stream_compact used memcpy even though the source and destination
+might overlap.
+ - filter applied to a closed file could cause a crash.
+
+</pre><h3><a name="V2.9.9b_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - putdeviceparams to a printer didn't close and reopen the device
+if only the page size or resolution was changed.
+
+</pre>
+
+<h2><a name="Version2.9.8"></a>Version 2.9.8 (6/20/94)</h2>
+
+<p>
+This is the first version that claims to be a full Level 2
+implementation.
+It was distributed to satisfy a contractual requirement.
+</p>
+
+<h3><a name="V2.9.8_Documentation"></a>Documentation</h3><pre>
+In make.doc:
+ - Adds a reference to the generic System V section at the end of
+the SCO section.
+ - Notes that DEC OSF/1 systems may require changing the name of the
+install program to installbsd.
+
+Updates drivers.doc to reflect the change from "properties" to
+"parameters".
+
+Updates the Aladdin Enterprises Free Public License to version 1.
+
+In language.doc, notes that certain device parameters will be phased out.
+
+</pre><h3><a name="V2.9.8_Procedures"></a>Procedures</h3><pre>
+Fixes bugs:
+ - The file aa.ps was included in the distribution by mistake.
+
+Notes in the Unix makefiles that X11R6 probably needs SM and ICE added to
+XLIBS.
+
+</pre><h3><a name="V2.9.8_Utilities"></a>Utilities</h3><pre>
+Fixes bugs:
+ - viewjpeg.ps used a non-existent file as its example.
+ - A temporary string in wrfont.ps was allocated too small.
+
+Upgrades font2c.ps so it will handle (simple) Type 0 fonts as well as Type
+1.
+
+</pre><h3><a name="V2.9.8_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - The TIFF drivers didn't byte-align each scan line.
+ - gdevtfax.c applied &amp; to an array member of a structure.
+
+Changes the param_list interface slightly: Implementations of the
+put_params driver procedure should now use param_signal_error to report
+errors, and should not give up at the first error. (Even though this is a
+non-backward-compatible change, old implementations will continue to work;
+they just won't deliver complete results to the setpagedevice Policies
+machinery.)
+
+</pre><h3><a name="V2.9.8_Platforms"></a>Platforms</h3><pre>
+Fixes bugs:
+ - Removes the time zone adjustment from gp_get_clock in gp_unix.c,
+since the value returned by all Unix systems is bogus.
+ - The DV/X makefile still included the dfaxhigh and dfaxlow drivers.
+ - gssetmod.com (VMS command file) didn't work properly if the
+argument list was empty.
+ - vms.mak, vms-axp.mak, and modules.lis hadn't been updated to
+reflect changes in 2.9.7.
+ - The MS Windows version wouldn't link (overflowed the 64K primary
+data segment).
+
+</pre><h3><a name="V2.9.8_Fonts"></a>Fonts</h3><pre>
+Makes the font substitution algorithm somewhat more intelligent.
+
+</pre><h3><a name="V2.9.8_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - Enumerating the pointers of a zero-length array of structures
+caused a divide by zero.
+ - iref.h didn't protect itself against multiple inclusion.
+ - The CCITTFaxEncode filter didn't byte-align the final
+end-of-block code if EndOfBlock and EncodedByteAlign were both true.
+ - make_initial_dict in iinit.c used `name' as a formal parameter
+name, which some compilers believe conflicts with a typedef.
+ - Not all internal operators had registered names.
+ - The GC used memcpy, rather than bytes_copy, when compacting
+objects, even though the source and destination might overlap.
+ - When debugging was enabled, gc_string_mark could give a spurious
+error indication.
+ - vmstatus returned too small a value for the maximum VM.
+ - The scanner could get into a loop when reading a radix-85 string.
+ - The GC could get into a state where it was called after every
+allocation (because of the patch setting global = true in ireclaim).
+ - The general path filling algorithm didn't skip regions that were
+completely outside the clipping box.
+ - The gs_screen_enum structure contained a pointer (porder) that
+pointed into the middle of a structure, confusing the GC.
+
+Implements the BitmapWidths flag in fonts. The default of false means that
+we use scalable widths even with xfonts.
+
+Changes the Generic resource category so that ResourceFileName is optional.
+
+Changes the .getdeviceparams operator so that it takes an optional
+dictionary giving the set of keys whose values are wanted. Changes the
+.putdeviceparams operator so that it takes an optional policy dictionary
+specifying the action to be taken on errors, and returns a list of keys and
+errors if it fails, rather than causing an error. These are
+non-backward-compatible changes, but ordinary programs do not use these
+operators.
+
+Changes the names of some internal operators and procedures by adding
+a . to the beginning:
+ currenttime
+ devicename
+
+Implements currentpagedevice, and a small subset of setpagedevice. Only
+the following keys in the page device dictionary are known to the current
+implementation, and the ones marked with * are not actually processed:
+ PageSize
+ InputAttributes
+ MediaColor, MediaWeight, MediaType, InsertSheet
+ (for InputAttributes matching only)
+ *ImagingBBox
+ OutputAttributes
+ OutputType
+ (for OutputAttributes matching only)
+ NumCopies
+ HWResolution
+ *Margins
+ *Orientation (for all devices, not just roll devices)
+ Policies
+ Install
+ BeginPage
+ EndPage
+Does not implement:
+ - Updating InputAttributes or OutputAttributes by sensing the state
+ of the device;
+ - Retrying media matching after an initial failure;
+ - Automatic handling of portrait vs. landscape page size;
+ - Recording the CTM after Install as the one to be used for
+ defaultmatrix, initmatrix, and initgraphics.
+Also, media matching is normally disabled (with InputAttributes = null)
+for all devices. ****** We had to disable setpagedevice just before
+shipping this release, because of interactions with the older device
+handling machinery that we could not fix in the time available.
+
+</pre><h3><a name="V2.9.8_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - 24-bit color (mem_true24_fill_rectangle and _copy_mono) had
+algorithm bugs.
+ - A complex conditional expression in gx_render_gray wouldn't
+compile properly with the DECStation 3100 Ultrix 4.3 compiler.
+ - The GC routines for gx_device_clip didn't handle the case where
+the 'current' pointer pointed to list.single.
+ - gx_add_char_bits used memcpy, rather than bytes_copy, for
+compressing character bitmaps, even though the source and destination might
+overlap.
+ - Some compilers require the definition of st_gstate_contents to
+precede the definitions of the GC procedures.
+ - Filling a large rectangle (more than 1K of bitmap) with a colored
+halftone overwrote random areas of the stack.
+
+Changes gs_setcachedevice[2] to take a pointer to an array of floats,
+rather than 6 or 10 individual floats. THIS IS A NON-BACKWARD-COMPATIBLE
+CHANGE.
+
+Implements the BitmapWidths flag in fonts.
+
+</pre>
+
+<h2><a name="Version2.9.7b"></a>Version 2.9.7-beta (6/5/94)</h2>
+
+<p>
+Yet another pre-3.0 beta. The main features are a fairly reliable
+garbage
+collector, and function prototypes almost everywhere they are needed.
+
+<h3><a name="V2.9.7b_Documentation"></a>Documentation</h3><pre>
+Fixes bugs:
+ - The comment at the beginning of the zfindlibfile procedure was
+incorrect.
+
+Replaces the GNU License (the COPYING file) with version 0 of the new
+Aladdin Enterprises Free Public License (the PUBLIC file).
+
+</pre><h3><a name="V2.9.7b_Procedures"></a>Procedures</h3><pre>
+Fixes bugs:
+ - The definition of cmykread.dev in gs.mak was incorrect (it
+modified color.dev).
+
+Adds the ability to specify a value for FONTPATH on the command line
+(-sFONTPATH=), overriding GS_FONTPATH.
+
+Replaces the -oper2 configuration resource type with the ability to specify
+in the op_def list the dictionary in which operators will be defined. (See
+opdef.h for more details.) This is an internal change only.
+
+</pre><h3><a name="V2.9.7b_Utilities"></a>Utilities</h3><pre>
+Fixes bugs:
+ - viewgif.ps got an error on interlaced GIF files whose height
+wasn't a multiple of 8.
+
+Changes traceop.ps so it stores the traced operator in the same dictionary
+where the operator is currently defined, if possible.
+
+</pre><h3><a name="V2.9.7b_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - The new G3 fax drivers crashed on page widths greater than 2623
+(40 * 64 + 63) pixels. (We fixed this by disallowing page widths greater
+than approximately twice this.)
+ - The 24-bit PCX driver had some debugging code accidentally left
+in it that produced large volumes of useless console output.
+
+Removes the previous (Leffler) TIFF/F driver and the TruFax driver.
+
+</pre><h3><a name="V2.9.7b_Platforms"></a>Platforms</h3><pre>
+Fixes bugs:
+ - time_.h, gp_unix.c, and gp_sysv.c didn't do the right thing on
+SVR4 platforms, where gettimeofday only takes 1 argument.
+ - The final linking command on Turbo C platforms didn't specify the
+COMPDIR directory for the linker.
+
+</pre><h3><a name="V2.9.7b_Fonts"></a>Fonts</h3><pre>
+
+Changes the standard Fontmap to use the URW contributed fonts as
+work-alikes for Helvetica and Times Roman.
+
+</pre><h3><a name="V2.9.7b_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - The garbage collector wasn't in a consistent state.
+ - In Level 2 mode, statusdict was allocated in global VM rather
+than local VM.
+ - resourceforall gave an error on the built-in categories such as
+Filter.
+ - The file searching algorithm didn't check the current directory
+first.
+ - When opening a file failed, it didn't return a different error
+depending on the problem.
+ - The CCITTFaxEncode filter crashed on widths larger than 2623 (64
+* 40 + 63) pixels. (We fixed this by disallowing page widths greater than
+approximately twice this.)
+ - The .type1getsbw operator gave an invalidfont error if a
+CharString started with anything other than a [h]sbw. (Adobe's published
+specs say this is invalid, but some Adobe MultiMaster fonts start with a
+callsubr and/or a callothersubr.)
+ - When printing out the stack with == after an error, the error
+handler got a repeated (and ultimately fatal) typecheck error if it
+encountered an object of non-standard type.
+ - The token operator could incorrectly attempt to free a structure
+on the stack if it encountered an input buffer boundary.
+ - string_to_ref didn't correctly set the a_local flag in the string
+object it created.
+ - If the -c switch was the last switch on the command line,
+Ghostscript always exited without going into interactive mode.
+ - copy didn't check for errors when copying a dictionary.
+
+Makes many minor changes (mostly adding prototypes) to reduce error and
+warning messages from gcc and other strict compilers.
+
+Adds files containing the 4 predefined PDF encodings (MacRoman, MacExpert,
+WinAnsi, and PDFDoc).
+
+</pre><h3><a name="V2.9.7b_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - image_bbox in gxccman.c could produce a division by 0 if a
+0-width character was being entered into the cache.
+ - gx_image_cached_char incorrectly specified a scale of 2x2 rather
+than 1x1 if it had to read bits from an xfont.
+ - Stale pointers in the halftone cache weren't cleared properly by
+a restore. (We fixed this by making grestoreall clear the halftone cache.)
+ - setdash used gs_malloc, rather than the current allocator, for
+allocating the dash pattern.
+ - If one attempted to fill a very wide region with a colored
+halftone, gx_dc_ht_colored_fill_rectangle would loop indefinitely.
+ - The container_offset in clipping devices was set incorrectly,
+causing the garbage collector to mangle pointers.
+
+Changes the fopen routine in IODevices so that it can return an arbitrary
+error code, rather than simply succeeding or failing. THIS IS A
+NON-BACKWARD-COMPATIBLE CHANGE. It only affects IODevice implementations,
+of which there are very few. (It doesn't affect ordinary device drivers.)
+
+Changes the char_metrics xfont procedure so it returns the width as
+floating point numbers rather than integers. THIS IS A
+NON-BACKWARD-COMPATIBLE CHANGE. It only affects xfont implementations, of
+which there are very few.
+
+Makes many minor changes (mostly adding prototypes) to reduce error and
+warning messages from gcc and other strict compilers.
+
+</pre>
+
+<h2><a name="Version2.9.6b"></a>Version 2.9.6-beta (5/23/94, not
+distributed to the public)</h2>
+
+<p>
+This, too, was supposed to be the last beta release for public
+release 3.0.
+It was created primarily for a user who desperately needed a Level 1 system
+that would run properly on a 64-bit hardware architecture. The garbage
+collector is badly broken (it's in the middle of an architectural change);
+setpagedevice is still not implemented.
+
+<h3><a name="V2.9.6b_Documentation"></a>Documentation</h3>
+
+<pre>
+Documents the standard location of Type 1 fonts on AIX.
+
+Changes the last few mentions of Ghostview for Microsoft Windows to GSview
+for Windows.
+
+Notes that Solaris 2.n provides the X11 header files in a different place.
+
+Changes README to reflect the differentiation between Aladdin Ghostscript
+and GNU Ghostscript.
+
+</pre>
+<h3><a name="V2.9.6b_Procedures"></a>Procedures</h3>
+
+<pre>
+Fixes bugs:
+ - The compilation rules for the modules that call the IJG library
+used -Ijpeg rather than -I$(JPEGSRC).
+ - The rule for gslib.dev omitted echogs$(XE) as a prerequisite.
+
+Makes it possible to define the values of buildtime, copyright, revision,
+revisiondate, and serialnumber in the makefile.
+
+</pre><h3><a name="V2.9.6b_Utilities"></a>Utilities</h3><pre>
+Fixes bugs:
+ - The viewgif.ps utility didn't handle local color tables.
+
+Updates ps2ai.ps to version 1.81.
+
+</pre><h3><a name="V2.9.6b_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - The TIFF and fax devices used some identical names, causing
+linker complaints.
+ - The bj10e/bj200 driver inadvertently disabled the sheet feeder.
+(The change may not actually fix this bug, since we don't have either of
+these printers with a sheet feeder to test it on.)
+ - The 'bit' device didn't map colors to pixel values correctly.
+ - The monochrome PCL driver didn't work around the fact that the
+Canon LBP4i printer didn't clear its seed row correctly.
+
+Adds new drivers:
+ - A user-contributed driver for the H-P DesignJet 650C.
+ - A user-contributed driver for the Canon LIPS III printer.
+ - A completely new tiffg3 driver with one based on the new, fast
+faxg3 code. This driver does not include any external code, and carries an
+Aladdin copyright.
+ - A tiffg4 driver, also based on the fast CCITT filter code.
+
+Removes the tiffg3x driver that appeared briefly in 2.9.5, and renames the
+previous (Leffler) tiffg3 driver as tiffg3x.
+
+Adds support for A0, A1, and A2 paper sizes to PCL drivers.
+
+Changes all the names involving "props" to "params", for consistency with
+the header files, some other internal interfaces, and Adobe's terminology.
+THIS IS A NON-BACKWARD-COMPATIBLE CHANGE. However, it only affects devices
+that implement their own get_props and put_props procedures, of which there
+aren't very many.
+
+</pre><h3><a name="V2.9.6b_Platforms"></a>Platforms</h3><pre>
+Fixes bugs:
+ - The DV/X makefile used X11 rather than X for the X11 library name.
+ - The DV/X makefile incorrectly included the PC display drivers.
+ - The DV/X makefile omitted gp_dosfs.$(OBJ) from the list of
+platform-specific files.
+ - The DV/X makefile used : rather than ; for separating directory
+names in GS_LIB_DEFAULT.
+ - x_.h omitted a needed alias for XtAppSetFallbackResources.
+ - The makefile entry for System V Unix systems didn't include
+gp_unifn.$(OBJ).
+ - The comment before LDFLAGS in the gcc makefiles incorrectly
+suggested using the -x switch on Ultrix platforms.
+ - The forward declaration of quant_params in zfdct.c upset the Sun
+compiler because it declared a parameter as float rather than floatp.
+* - The Microsoft C compiler, like the Borland C compilers, only
+compares the offset part of segmented pointers.
+
+</pre><h3><a name="V2.9.6b_Fonts"></a>Fonts</h3><pre>
+
+Adds a fontmap suitable for use with Adobe Type Basics.
+
+</pre><h3><a name="V2.9.6b_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - The STACK_LOOP_BEGIN macro in istack.h didn't work correctly on
+segmented systems.
+ - The end_phase procedure in igc.c didn't work correctly on
+segmented systems.
+ - Indexed color spaces didn't mark their base space properly when
+garbage collecting.
+ - The garbage collector didn't work on segmented systems, because
+it smashed the lsize field of large objects with mark/reloc information.
+ - Some structures didn't have correct associated GC procedures:
+gs_indexed_map, gs_client_pattern, gs_pattern_instance.
+ - restore could free names or stack segments that were still
+referenced.
+* - If a packed object caused an error, the error object could be set
+to garbage rather than the correct object.
+* - Badly designed error handlers which use $error for temporary
+storage could cause a dictfull error.
+ - Some compilers objected to the use of "dict" as a variable name
+in a scope where it was defined as a type.
+ - IODevices were declared const and non-const inconsistently.
+ - setpagedevice popped one object too many off the stack if the
+request included any subdictionaries that needed to be merged.
+ - More garbage collector bugs were fixed.
+ - If the current stack block was empty, Level 2 restore would give
+a spurious typecheck error.
+ - The CCITTFaxEncode filter could get confused if it emptied the
+input and filled the output at the same time.
+ - The CCITTFaxEncode filter could insert an extra EOL if it had to
+suspend at certain times.
+ - The new parser for literal strings (as of 2.9.5) could mis-count
+internal parentheses if a parenthesis caused the internal buffer collecting
+the string to overflow.
+ - If the current stack block had fewer than 3 elements,
+.type1addpath could report a spurious typecheck error.
+ - Text rendering operations (show, stringwidth, etc.) caused a
+crash if the current color was a Pattern that hadn't already been
+rasterized.
+ - If a program did a grestore when the graphics state stack was
+empty, the graphics state was initialized to unexpected (and, in some
+cases, invalid) values.
+ - pathforall could cause a bogus stackoverflow if it overflowed the
+current stack block.
+ - Closing an encoding filter with a procedure as target left the
+filter on the stack.
+* - The outer loop in dict_lookup() could cause an addressing fault
+on segmented machines when looking up Level 2 operators, because the offset
+could get decremented past 0.
+ - There was an = instead of an == in a test in scanner_reloc_ptrs.
+ - The call on gs_reloc_refs in sproc_reloc_ptrs in zfproc.c omitted
+the last (gcst) argument.
+
+(Re-)implements the 2-D case of CCITTFaxEncode, and fixes a couple of bugs
+in it.
+
+Adds DiffEncode and DiffDecode filters that implement color prediction for
+the PDF variant of the LZWDecode filter.
+
+Changes the specification of .oserrorstring to be similar to getenv,
+where, etc. THIS IS A NON-BACKWARD-COMPATIBLE CHANGE; however, no
+user-written code should be using .oserrorstring.
+
+Adds oversampling for better character rasterizing.
+
+</pre><h3><a name="V2.9.6b_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - gx_dc_ht_colored_fill_rectangle gave a compiler warning because
+of a problem with const pointers.
+ - dfmul2fixed_vars (in gxfixed.h) omitted the &amp; before vda on
+big-endian platforms, causing compilation errors.
+ - IODevices were declared const and non-const inconsistently.
+ - The Type 1 rasterizer never enabled overshoot suppression.
+ - stroke didn't fatten the line properly if stroke adjustment was
+enabled, or if the line was horizontal or vertical.
+* - The clipping test for characters was too strict by almost 1
+pixel, leading to unnecessary clipping of text at the edge of the clipping
+box.
+* - The initial clipping box was computed incorrectly for devices
+whose initial transformation matrix included a rotation.
+
+Changed the implementation of clipping lists and show enumerators to use
+separate objects rather than embedded objects, to pacify the GC. (This is
+an internal change, not visible at the PostScript or API level.)
+
+Makes the character cache trim off left and right blank areas, as well as
+top and bottom. (Internal change.)
+
+Adds oversampling for better character rasterizing.
+
+</pre>
+
+<h2><a name="Version2.9.5b"></a>Version 2.9.5-beta (4/11/94)</h2>
+
+<p>
+This was supposed to be the last beta release before 3.0, but it
+won't be.
+The only known major defects are the unreliable garbage collector, and the
+dummy implementation of setpagedevice/currentpagedevice.
+
+<h3><a name="V2.9.5b_Documentation"></a>Documentation</h3>
+
+<pre>
+Fixes bugs:
+ - The file commnew.doc didn't belong in the fileset.
+
+Notes in the makefiles that SVR4 systems may need to set EXTRALIBS=-lnsl.
+
+Adds a user-contributed `man' page for the ps2epsi utility.
+
+</pre><h3><a name="V2.9.5b_Procedures"></a>Procedures</h3><pre>
+Fixes bugs:
+ - The IJG files didn't compile properly by themselves, because they
+didn't have $(AK) in their dependency list.
+
+Changes back the handling of files named on the command line, so that they
+are first sought in the current directory, and if that fails, use the
+search path. (2.9.4-beta changed things so that files on the command line
+did not use the search path, because as of that version, the search path
+doesn't necessarily include the current directory. I consider the "check
+the current directory and then use the search path" rule, which is the
+MS-DOS standard and was used in Ghostscript prior to 2.9.4, a serious
+mistake, since it is one of the best-known security holes in Unix and can
+also produce confusing and unexpected results depending on the current
+directory; I would much rather have a clear distinction between
+user-specified files, which should not use any path searching, and system
+files, that only use the defined search path. However, as of this moment,
+users seem to want the convenience at the expense of insecurity and
+confusion.)
+
+Adds '.' to the beginning of the search path for MS-DOS platforms, to
+conform to the usual MS-DOS file searching convention.
+
+Adds a -c ("code") switch, which interprets following arguments (until the
+next switch) as PostScript tokens.
+
+Changes the handling of FEATURE_DEVS so that either level1.dev or
+level2.dev must normally be selected. THIS IS A NON-BACKWARD-COMPATIBLE
+CHANGE for Level 1 systems, which formerly set FEATURE_DEVS to an empty
+definition.
+
+</pre><h3><a name="V2.9.5b_Utilities"></a>Utilities</h3><pre>
+Fixes bugs:
+ - bench.ps didn't switch back to local VM properly before running
+the program being benchmarked.
+
+Adds a ppmsetpagesize command to the pstoppm utility.
+
+</pre><h3><a name="V2.9.5b_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - The PCX and GIF drivers used an incorrect algorithm for computing
+the blue component of the color palette, which could cause colors to come
+out with not quite enough blue.
+ - The SPARCprinter driver wouldn't compile with non-ANSI compilers.
+
+Adds new drivers:
+ - A user-contributed driver for DEC sixel displays like the VT240
+(sxlcrt, in gdevln03.c, which has a FSF copyright.)
+ - A much larger and supposedly faster version of the TIFF/F driver
+(tiffg3x, in gdevtifx.c), contributed by a user. This has the same
+copyright as the TIFF/F driver (gdevtiff.c).
+ - A driver (faxg3, in gdevfax.c) that produces plain Group 3 fax
+output with no header, using the CCITTFaxEncode filter to do the work.
+(This is around 2.5-3 times as fast as the other fax drivers distributed
+with Ghostscript.)
+ - A user-contributed driver for the Mitsubishi CP50 color printer.
+
+Changes the `bit' driver so one can set the Colors and *Values properties.
+
+Makes the color mapping for PC displays, PCX files, and GIF files identical
+(they differed slightly before).
+
+</pre><h3><a name="V2.9.5b_Platforms"></a>Platforms</h3><pre>
+Fixes bugs:
+ - VMS used DISPLAY rather than DECW$DISPLAY to get the display name
+if opening the display failed.
+ - Many minor bugs relating to OS/2 and Win32 were fixed.
+ - On Unix and DV/X platforms, the install script didn't mkdir
+$(gsdir), and didn't mkdir the intermediate directory for the man page.
+ - On BSD and UTek platforms, the declaration of memset in
+memory_.h, and the definition in gsmisc.c, conflicted with the ANSI
+declaration.
+ - One of the SPARC compilers compiled the intersection computation
+in arc_either (gspath.c) incorrectly.
+ - The temporary file names created under OS/2 could exceed the 8.3
+length limit.
+
+</pre><h3><a name="V2.9.5b_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - The test files for the IJG library had been damaged by EOL
+conversion.
+ - The garbage collector didn't mark some of the most recently
+created names.
+ - The interpreter would sometimes report a typecheck instead of a
+stackunderflow.
+ - If aload didn't have enough room on the stack, it would report a
+rangecheck rather than a stackoverflow.
+ - zcontext wouldn't compile, because it hadn't been updated to the
+new GC interfaces.
+ - The definition of private_st_stream_proc_state in ifilter.h ended
+with a semicolon, which upset some compilers.
+ - load didn't check to make sure that the dictionaries it examined
+had read access.
+ - cvrs didn't handle negative numbers in radix 2 or 3 properly.
+ - The allocator could become confused if it was asked to allocate a
+large array.
+ - readline gave an ioerror rather than a rangecheck if it
+overflowed the string.
+ - The allocator didn't free packed arrays properly.
+ - The allocator's check for LIFO freeing of arrays was off by 1, so
+it never succeeded.
+ - The undercolor removal and black generation procedures weren't
+initialized properly.
+ - If the interpreter couldn't find gs_init.ps, it returned a random
+exit code.
+ - If an operator expected a procedure and didn't get one, it
+sometimes gave an invalidaccess rather than a typecheck.
+ - Unix file enumeration often did the wrong thing if there were
+directories in the pattern.
+ - The ASCIIHexDecode filter read an extra character after the
+terminating &gt;.
+ - scalefont didn't fill in ScaleMatrix properly.
+ - The CCITTFaxEncode filter crashed if the width of the page wasn't
+a multiple of 8 bits.
+ - The error printing code used .languagelevel, which wasn't defined
+in Level 1 configurations.
+ - setpagedevice didn't pop its argument.
+ - Definitions in statusdict didn't change according to the current
+language level.
+ - Separation color spaces didn't allow strings as color space names.
+ - Due to a bug in chunk_locate_ptr, the garbage collector sometimes
+decided incorrectly that a pointer was pointing outside collectable space.
+ - (Many other garbage collector bugs were fixed.)
+
+Implements additional Level 2 features:
+ - Garbage collection for strings.
+ - Expandable operand and dictionary stacks, and the ability to set
+ the maximum size of these stacks.
+ - Additional user and system parameters. The following are dummies:
+ AccurateScreens, JobName, JobTimeout, WaitTimeout.
+ - Procedure-based filters usable with cvx/exec and token.
+ - Separation color spaces (always using the alternate space).
+ (These were theoretically implemented in version 2.6, but they were
+ never tested and were actually missing most of the implementation.)
+ - VMThreshold and VMReclaim for invoking GC automatically.
+
+Adds a hook in iscan.c for parsing DSC comments.
+
+Adds encoding and decoding filters for the BCP and TBCP protocols. These
+are not fully implemented yet:
+ - The interrupt and status request characters are ignored on input,
+ and never generated on output;
+ - The TBCP encoder doesn't emit the start-of-protocol string;
+ - The TBCP decoder doesn't recognize the end-of-protocol string.
+
+Factors out Type 1 font capability as a separate feature.
+
+Changes the names of some files:
+ packed.h to ipacked.h;
+ bnum.h to ibnum.h.
+
+Changes the name of the value.index member of a ref to value.boolval.
+(Internal change only.)
+
+</pre><h3><a name="V2.9.5b_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - The definition of RELOC_PTRS_BEGIN in gsstruct.h wouldn't compile
+properly with non-ANSI compilers.
+ - The JPEG library wouldn't compile properly with non-ANSI compilers.
+* - The platform font machinery gave up too easily in some cases.
+ - CMYK devices needing halftoning converted the CMYK color to RGB.
+ - The debugging code in arc_add (gspath.c) didn't print the output
+values correctly.
+
+Factors out Type 1 font capability as a separate feature.
+
+</pre>
+
+<h2><a name="Version2.9.4b"></a>Version 2.9.4-beta (2/19/94)</h2>
+
+<h3><a name="V2.9.4b_Procedures"></a>Procedures</h3>
+
+<pre>
+Changes Ghostscript's path searching algorithm so that it does not
+automatically look in the current directory first. (The former algorithm
+was more MS-DOS-like; the new one is more Unix-like.) If you want to
+include the current directory, you must include '.' in the search path.
+THIS IS A NON-BACKWARD-COMPATIBLE CHANGE.
+
+Adds two new resource types for genconf.c:
+ - -header filexxx.h adds #include "filexxx.h" to gconfig.h.
+ - -libpath dir adds dir to the list of library search paths.
+
+</pre><h3><a name="V2.9.4b_Utilities"></a>Utilities</h3><pre>
+Fixes bugs:
+ - impath.ps (used by bdftops) computed the starting X coordinate
+incorrectly, typically causing characters to be displaced slightly to the
+right.
+ - pstoppm.ps didn't handle local and global VM properly.
+
+Adds a ps2ai.ps utility, contributed by a user, for converting arbitrary
+PostScript files into a form compatible with Adobe Illustrator.
+
+</pre><h3><a name="V2.9.4b_Drivers"></a>Drivers</h3><pre>
+
+Adds new drivers:
+ - A user-contributed driver for Imagen Impress laser printers.
+ - A user-contributed driver for the DEC LA75plus printer.
+
+</pre><h3><a name="V2.9.4b_Platforms"></a>Platforms</h3><pre>
+
+Under OS/2, adds the ability to keep Ghostscript in memory for a
+specified number of minutes.
+
+Adds support for Win32 and Win32s.
+
+Changes the MS Windows platform font interface so that it does not attempt
+to render fonts at sizes smaller than 6 pixels. Changes the X Windows
+interface, which already did this for 4-point and smaller fonts, to also
+use a lower limit of 6 pixels. Also changes the X Windows platform font
+machinery so it does not render fonts at sizes larger than 36 pixels: at
+large sizes, Ghostscript does a perfectly good job, and some X font servers
+rasterize the entire font and lock up the entire window system while doing
+so.
+
+</pre><h3><a name="V2.9.4b_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - currentdash always returned a new array of reals, rather than the
+actual argument of setdash.
+ - Strings in binary object sequences read in as integers.
+ - Because of a bug in chunk_locate_ptr, some large objects didn't
+get freed properly.
+ - If an error occurred while processing an image, Ghostscript would
+attempt to free random blocks of storage.
+ - Input filters discarded trailing data, rather than filling it out
+with zeros. (This is now fixed for ASCIIHexDecode and ASCII85Decode; it's
+not clear what other filters it should affect.)
+ - The ASCII85Encode filter produced garbage output for the final
+1-4 bytes before EOD.
+* - The TIFF output driver produced incorrect output for the second
+and subsequent pages if the output was being produced on multiple files.
+* - The default handleerror did a 'stop', which was not correct.
+ - gpcheck.h converted all positive return codes to 0 if interrupt
+checking was enabled.
+ - Images with multiple data sources didn't work.
+ - Images with 12-bit sample values didn't work.
+ - Images with a file as the data source read additional data beyond
+what was required.
+ - 2 vmreclaim worked (pretty much), but 1 vmreclaim didn't.
+ - If %lineedit was opened multiple times, characters from later
+openings overwrote characters from earlier ones.
+ - token returned garbage for the "remaining string" result when
+reading from a string, if it actually read all of the string. (New bug in
+2.9.2, probably.)
+
+Implements additional Level 2 features:
+ - DCTEncode and DCTDecode filters.
+ - Filters with procedures as the data source or target.
+ (Except for token and cvx/exec.)
+ - Garbage collection for names.
+
+Changes the error printout so that strings are always truncated at 200
+characters.
+
+For Level 2 systems, changes the initial setting of the object format
+parameter from 0 to an appropriate non-zero value.
+
+* Changes the .quit operator so that it takes two operands, an error object
+and an error code; if the latter is negative, the interpreter returns this
+as the error code, rather than e_Quit.
+
+Makes StandardEncoding and ISOLatin1Encoding arrays, rather than packed
+arrays, on large-memory systems, for compatibility with certain test
+suites. Changes .registerencoding to accept arrays as well as packed
+arrays.
+
+</pre><h3><a name="V2.9.4b_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - Due to an error in cie_mult3, CIE-based colors were badly
+mis-mapped.
+* - Very narrow (but not empty) rectangles would disappear.
+* - Small halftone cells could smash the next higher entry in the
+halftone cache.
+ - The orientation algorithm in gxstroke.c still interchanged
+clockwise and counter-clockwise coordinate systems (after having been
+"fixed" at least 3 times).
+ - Stroking 1-pixel-wide lines shortened them, instead of
+lengthening them, if non-butt caps were requested.
+
+Refactors mem_mapped8_copy_mono because of limitations in the bcc32
+compiler.
+
+</pre>
+
+<h2><a name="Version2.9.3b"></a>Version 2.9.3-beta (1/19/94)</h2>
+
+<p>This version was created for evaluation purposes for a few users who
+needed Level 2 capability; it was never released to anyone else, even
+beta testers.
+
+<h3><a name="V2.9.3b_Documentation"></a>Documentation</h3><pre>
+Fixes bugs:
+ - The description of psview and xpsview was incorrect.
+
+</pre><h3><a name="V2.9.3b_Procedures"></a>Procedures</h3><pre>
+Changes the installation directories for Unix and similar systems to put
+Ghostscript data in $(datadir)/ghostscript/gs-NN.NN.NN rather than directly
+in $(datadir)/ghostscript. (Fonts still go in $(datadir)/ghostscript/fonts.)
+
+</pre><h3><a name="V2.9.3b_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - Some spaces were incorrectly replaced with tabs in the help
+message in the 3B1 display driver.
+ - The BMP driver wrote a spurious scan line at the beginning
+of its output.
+ - The monochrome PCX driver had the two palette elements
+interchanged.
+
+Adds new drivers:
+ - A user-contributed driver for the Xerox XES printer format. This
+has a FSF copyright.
+ - A user-contributed driver for the Epson AP3250 printer. (This is
+the same as the Stylus 800, with slightly different margins.)
+ - A user-contributed driver for the DEC LA70 printer with some
+algorithms for improving text at low resolutions. This has a FSF
+copyright.
+ - A user-contributed driver for an intermediate-resolution mode
+for 9-pin "Epson-compatible" printers.
+
+Changes the name of the Stylus 800 driver from escp2 to st800.
+
+Adds a compile-time flag to the Epson driver to cope with Panasonic 9-pin
+printers, which sometimes have trouble mixing graphics and tabs.
+
+</pre><h3><a name="V2.9.3b_Platforms"></a>Platforms</h3><pre>
+Fixes bugs:
+ - The MS Windows driver (gp_mswin.c) referred to iodev.h rather
+than gxiodev.h.
+ - On Unix System V platforms, gp_unifs.c and gdevpipe.c were
+incorrectly omitted from the link list.
+ - (Some?) System V platforms don't have the S_ISDIR macro,
+requiring a change in stat_.h.
+ - The Unix `install' target didn't install gs_std_e.ps and
+gs_iso_e.ps.
+ - No MODULES.LIS file was provided for VMS.
+
+Adds Desqview/X makefiles that actually work.
+
+Documents the set of H-P-supplied patches needed to make H-P's
+compilers process Ghostscript.
+
+Changes the MS Windows driver so that if the user presses the Enter key
+while the image window has the focus, the text window will be brought to
+the top and made the active window. This is useful when viewing a
+multi-page document with Ghostscript.
+
+</pre>
+<h3><a name="V2.9.3b_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - The definition of public_st_client_color() in gxccolor.h
+included an extraneous semicolon.
+ - The definition of private_st_AXD_state() in sfilter.h included an
+extraneous semicolon.
+ - saxx.c didn't include sfilter.h, which it needed for the
+definition of private_st_AXD_state().
+ - ialloc_struct failed to create a separate chunk if the structure
+was very large.
+ - setcolorspace didn't allocate the colorspace object in the same
+VM space as the graphics state, causing problems when the colorspace was
+freed.
+ - In rare circumstances, currentfile could return an empty array
+rather than a file.
+ - Dictionary keys were always allocated in global VM.
+ - If NOPLATFONTS was true, definefont didn't check whether the
+dictionary was read-only before trying to insert an ExactSize key.
+ - startjob could get an invalidaccess error, because serverdict was
+allocated in global VM.
+ - Using definefont with an already registered font created a
+circular list structure.
+ - If a PostScript procedure appeared as a CharString in a Type 1
+font, it was always called with the character name, never the character
+code.
+ - The SubFileDecode filter didn't work with a non-empty EOD string
+(went into an endless loop). (Probably a new bug in 2.8.)
+ - save/restore didn't properly restore the maxlength of a
+dictionary, causing data to get smashed at random. (New bug in 2.9.)
+ - save didn't mark objects as old, so a nested restore had no
+effect. (New bug in 2.9.2.)
+ - After returning from an OtherSubrs callback, op_type1_free
+freed the saved interpreter state incorrectly. (New bug in 2.7.)
+ - Level 1 configurations didn't work because .makeoperator gave an
+invalidaccess error. (New bug in 2.9.2.)
+ - ASCII85 string literals didn't work. (Probably a new bug in 2.8.)
+ - If the current global/local allocation mode was different at the
+end of a file than at the beginning, an addressing fault could occur
+(gs_unregister_root in gs_run_string). (New bug in 2.9.2.)
+ - After a setfileposition on a file open for reading,
+fileposition would return an incorrect value, even though the stream
+was actually repositioned properly.
+
+Brings the dictionary unpacking code for the DCT filters into line with
+Adobe Technical Note 5116, which describes the Picky parameter for
+DCTDecode and the NoMarker, Resync, Blend, Picky, and Relax parameters for
+DCTEncode.
+
+Changes the .quit operator so that if given a negative argument, the
+interpreter returns this as the error code, rather than e_Quit.
+
+Changes the Ghostscript integer version number from 100P+10S+T to
+10000P+100S+T.
+
+Changes the default halftone screen for high-resolution devices, both
+black-and-white and color.
+
+</pre><h3><a name="V2.9.3b_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - The software floating multiply code used with USE_FPU=-1 only
+worked on little-endian platforms.
+ - Specifying a left side bearing to .type1addpath produced an
+inappropriate offset.
+
+</pre>
+
+<h2><a name="Version2.9.2b"></a>Version 2.9.2-beta (1/2/94)</h2>
+
+<p>This version was distributed only to beta testers. It adds a garbage
+collector and full local and global VM support. It is the first version
+that sets languagelevel = 2, i.e., claims to be a Level 2 implementation.
+
+<h3><a name="V2.9.2b_Documentation"></a>Documentation</h3><pre>
+Fixes bugs:
+ - make.doc still referred to use_* variables in gdevx.c, and
+use.doc didn't explain the use* X resources.
+
+Notes that -Olimit=1000 is needed to compile Ghostscript on AXP systems
+under OSF/1 1.3.
+
+</pre>
+
+<h3><a name="V2.9.2b_Utilities"></a>Utilities</h3><pre>
+Fixes bugs:
+ - viewgif.ps did not work with interlaced images.
+ - font2c.ps omitted gsmemory.h from the #include list in compiled
+fonts.
+
+</pre><h3><a name="V2.9.2b_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - The MS Windows driver hadn't been updated to work with the
+new additions to the gx_device structure.
+ - The BMP file driver wrote one scan line too many.
+ - The cdj driver omitted an important cast to int in the error
+diffusion code (FSdither macro).
+
+Changes the SuperVGA drivers to recognize erasepage and reset the
+color table, like the X driver.
+
+Adds some fragmentary code to begin implementing the PostScript fax
+extensions.
+
+</pre><h3><a name="V2.9.2b_Platforms"></a>Platforms</h3><pre>
+Fixes bugs:
+ - The procedure initializers for the MS Windows console I/O
+were missing the new reset element.
+ - The makefile entry in bcwin.mak used -fdev rather than -iodev.
+ - The Borland C++ makefiles exceeded MS-DOS's line length limit if
+the compiler files were in the standard Borland directory (BORLANDC).
+ - Some procedures weren't declared with prototypes in gp_vms.c.
+ - Some declarations had to be reordered to pacify the VAX compiler.
+ - Under MS Windows, Ghostscript didn't automatically de-iconify the
+text window to display messages on an error exit.
+ - The Unix makefile rule for gconfig_.h used echogs rather than
+./echogs.
+ - The Microsoft C makefile referred to an obsolete file gs.tr.
+ - gp_unifs.c used strpbrk and strrchr, which some systems lack.
+
+Updates the OS/2 code and documentation for compatibility with the current
+Ghostscript version.
+
+</pre><h3><a name="V2.9.2b_Fonts"></a>Fonts</h3><pre>
+Fixes bugs:
+ - The X11 .pfa fonts replaced their .gsf requirements in the
+fontmap, but not distributed with the previous (beta) release.
+
+Adds fontmaps appropriate for use with DEC Ultrix and OSF/1 systems.
+
+</pre><h3><a name="V2.9.2b_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - 4-value entries in the Metrics dictionary were interpreted with
+the width and side bearing interchanged.
+ - Objects large enough to require their own chunk were not freed
+properly.
+ - The GS_FONTPATH scanner didn't deal with the possibility that
+opening a file might fail.
+ - The interrupt and timeout errors incorrectly pushed an error
+object on the operand stack.
+ - imagemask gave an error if it was invoked with a dictionary
+argument with a current color space with more than 1 parameter.
+ - definefont insisted that a new font not have a FID entry.
+ - Some places didn't cast char to byte when needed.
+ - An extra element was left on the stack when substituting the
+default font for a font whose file couldn't be found.
+ - The CCITTFaxDecode filter didn't allow the dictionary to be
+omitted. (The Adobe documentation doesn't allow this, but Adobe
+implementations do.)
+ - When the input came from a pipe (`-') switch, opening a filter on
+currentfile that required more than 1 input byte to make progress would
+cause Ghostscript to hang (in sreadbuf).
+ - The interpreter didn't call gs_set_lib_paths before executing a
+compiled-in initialization file.
+ - A stream could be closed more than once. (New bug in 2.8.)
+ - The LZW decoder produced incorrect output if a code string was
+too long to fit into a single output buffer. (New bug as of 2.8.)
+
+Implements a special check in def to allow construction of systemdict,
+which is stored in global VM but references dictionaries in local VM.
+
+Implements additional Level 2 features:
+ - %null% and %ram% IODevices.
+ - startjob, exitserver.
+ - Local and global VM (finish).
+ - Garbage collection (for everything except names and strings).
+
+Moves the procedures for selecting paper size from systemdict to userdict.
+
+Sets languagelevel to 2 in Level 2 mode, since essentially all of
+Level 2 is now implemented.
+
+Factors out the Level 1 extended color facilities (CMYK color and
+colorimage) as a separate configuration feature.
+
+Adds some preliminary code to begin implementing the Adobe BCP and TBCP
+communication protocols.
+
+Changes the implementation of save and restore so that the bookkeeping
+structures are allocated in the new area, not the old. (This is an
+internal change not visible at the PostScript level.)
+
+</pre><h3><a name="V2.9.2b_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - gdevprn used some preprocessor macros in formal argument
+lists that ansi2knr couldn't handle.
+ - pick_cell_size called gs_distance_transform with a 0 argument
+that non-ANSI compilers didn't automatically promote to floating point.
+ - gs_screen_init called hypot with integer arguments that
+non-ANSI compilers didn't automatically promote to floating point.
+ - Some places didn't cast char to byte when needed.
+ - The vx/vy origin adjustment for WMode=1 wasn't implemented.
+ - The pattern cache wasn't initialized properly.
+ - Composite fonts didn't properly decode strings that started with
+an escape sequence, which have a special (undocumented) decoding rule, and
+also didn't properly decode strings with multiple consecutive escape
+sequences.
+
+Factors out the Level 1 extended color facilities (CMYK color and
+colorimage) as a separate configuration feature.
+
+</pre>
+
+<h2><a name="Version2.9.1b"></a>Version 2.9.1-beta (12/7/93)</h2>
+
+<p>This version was distributed only to beta testers.
+
+<h3><a name="V2.9.1b_Utilities"></a>Utilities</h3><pre>
+Adds a viewgif.ps utility to view GIF files. The current version does not
+work with interlaced data, local color tables, or files containing more
+than one image.
+
+</pre><h3><a name="V2.9.1b_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - putinterval and copy didn't do the right thing if the source and
+destination were aliases for overlapping sections of the same array or
+string.
+ - The DCT filter stub didn't allow the dictionary to be omitted.
+(The Adobe documentation doesn't allow this, but Adobe implementations
+do.)
+
+Adds an optional dictionary argument to the LZWDecode filter, containing
+InitialCodeLength, FirstBitLowOrder, BlockData, and EarlyChange entries.
+Setting these parameters appropriately allows reading (non-interlaced) GIF
+data directly.
+
+</pre><h3><a name="V2.9.1b_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - setdash produced inverted output if the pattern had an odd
+number of elements and the offset O had the property that L &lt;= O mod
+2*L, where L was the sum of the pattern elements.
+
+</pre>
+
+<h2><a name="Version2.9b"></a>Version 2.9-beta (12/6/93)</h2>
+
+<p>Like 2.7, this version was created to satisfy a contractual
+requirement,
+and will never be distributed to anyone other than the other party to the
+contract.
+
+<h3><a name="V2.9b_Documentation"></a>Documentation</h3><pre>
+Notes that Ghostscript runs on IBM PCs and compatibles under DR DOS
+6.0.
+
+Notes that Ghostscript will run on IBM PCs and compatibles with
+Hercules display cards if you redirect text output to a file.
+
+Notes that the alternate DeskJet 500C driver (djet500c) does not work
+on the 550C.
+
+Gives a list of system-specific directories where Type 1 fonts are
+likely to be installed, as a suggested setting for GS_FONTPATH.
+
+</pre><h3><a name="V2.9b_Procedures"></a>Procedures</h3><pre>
+Changes the distribution script so that it stores all text files in the
+main source archive with Unix end-of-line conventions, but with DOS
+end-of-line conventions in the MS-DOS-specific archive.
+
+Changes the MS-DOS, MS Windows, and OS/2 makefiles so that 486SX and 486DX
+processors are different CPU_TYPEs. (The former, designated by
+CPU_TYPE=485, does not include an on-chip FPU.)
+
+Adds a line to gs_init.ps which can be uncommented to select A4 as
+the default paper size.
+
+Adds a definable CFLAGS macro to the makefiles, allowing -DA4 to
+select A4 as the default paper size.
+
+Adds the H-P printer drivers to the standard Unix configurations.
+
+</pre><h3><a name="V2.9b_Utilities"></a>Utilities</h3><pre>
+Fixes bugs:
+ - If there were no unencoded characters, prfont.ps would get
+an error.
+
+Changes ansi2knr to accept a wider range of function declaration syntax,
+and to not depend on any Ghostscript header files.
+
+</pre><h3><a name="V2.9b_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - Several drivers (DigiFax, Epson LQ-2550, NEC P6) didn't handle
+A4 paper width.
+ - The IBM ProPrinter wasn't being initialized properly.
+ - The Epson driver didn't work properly with compilers that
+insisted on 'char' being a signed type.
+ - The Epson driver ignored its end_string argument, producing
+incorrect end-of-page behavior on some printers.
+
+Adds new drivers:
+ - User-contributed drivers for Bellcore MGR (a window manager most
+commonly used with OS-9) devices.
+ - A user-contributed driver for the CIF file format.
+ - A user-contributed driver for the HP 2563B line printer.
+
+Changes the LaserJet 2p, 3, and 4 drivers so they set the initial position
+to (0,0) rather than (0,0.25"). (I don't remember why it was the other
+way.)
+
+Implements the PageCount property in all drivers, not just printer
+drivers.
+
+Introduces a new gx_tile_bitmap type, and changes the tile_rectangle
+device procedure to take it in place of gx_bitmap. THIS IS A
+NON-BACKWARD-COMPATIBLE CHANGE. However, it only affects devices that
+implement their own tile_rectangle procedures, of which there aren't very
+many.
+
+</pre><h3><a name="V2.9b_Platforms"></a>Platforms</h3><pre>
+Fixes bugs:
+ - The VMS module lists referred to SDCTD and SDCTE instead of
+SDCT.
+ - The Unix install script tried to install the non-existent file
+readme.doc.
+ - Microsoft C does something bizarre with empty macro parameters,
+which caused a problem with the gs_struct_type_... macros.
+ - The Unix platforms didn't automatically handle the presence
+or absence of &lt;dirent.h&gt;.
+ - The DEC Alpha OSF/1 1.3 library lacks `const' in the prototype
+for popen, which requires a workaround.
+ - The DEC Alpha OSF/1 1.3 X Windows library uses `private' as a
+member name.
+
+Splits off gp_unifs.c, containing code common to "Unix-like" file systems.
+
+Adds a user-contributed OS-9 platform.
+
+</pre><h3><a name="V2.9b_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - The currentfile cache wasn't updated properly if an executable
+file appeared in the middle of a procedure. In particular, eexec-encoded
+.PFB fonts often didn't work.
+ - There was an extraneous `goto top' in scfd.c.
+ - An integer constant overflowed in iname.c.
+ - -2147483648 (i.e., -1 &lt;&lt; 31) was converted to a float.
+ - eexec didn't skip the first 4 characters correctly if they were
+split across a buffer boundary.
+ - The font/matrix pair cache didn't properly free entries with only
+an XUID that was being deallocated.
+
+Implements additional Level 2 features:
+ - Patterns, makepattern, setpattern.
+ - IODevice resource, setdevparams, currentdevparams.
+ - OutputDevice resource, setpagedevice, currentpagedevice.
+ (Partially implemented.)
+
+Adds a new type t_struct to handle miscellaneous types that are allocated
+as objects and that the interpreter doesn't handle specially, and changes
+condition, fontID, gstate, lock, and save types to use t_struct. (This is
+an internal change, not visible at the language level.)
+
+Moves the maxlength of a dictionary to its own ref, eliminating the "size
+of integer" hack. (This is an internal change, not visible at the
+language level.)
+
+Adds the last OS error number to the error printout.
+
+Removes the obsolete framedevice operator.
+
+Implements resetfile (the only Level 1 operator not yet implemented!).
+
+Changes the name of the getdevice operator to .getdevice.
+
+</pre><h3><a name="V2.9b_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - A couple of necessary casts from char * to byte * were omitted.
+ - A Sun compiler required an extra cast to (void *) in the e1
+macro in clip_rect_enum_ptrs in gxcpath.c.
+ - The gx_dc_ procedures defined in gxdraw.c weren't marked as
+'private'.
+ - The number of "on" pixels in a halftone cell sometimes varied by
+1 from cell to cell.
+ - Mapping a gray level to CMYK didn't subtract it from 1 (to
+produce the K component).
+* - charpath took hints into account.
+
+Shuffles the order of some declarations to pacify the VMS C compiler.
+
+</pre>
+
+<hr>
+
+<h2><a name="Version2.8b"></a>Version 2.8-beta (11/10/93)</h2>
+
+<p>This version was distributed only to beta testers. It adds Type 0
+font
+support. It also includes extensive redesign of streams (to eventually
+support procedure streams) and device properties (to eventually support
+get/setpagedevice and get/setdevparams).
+
+<h3><a name="V2.8b_Documentation"></a>Documentation</h3>
+
+<pre>
+Notes the change in X11 foreground/background handling.
+
+Changes README so it no longer claims that Ghostscript works with X11R3.
+
+Notes (in devs.mak) that the cdjmono driver is the best one to use for the
+DeskJet 510.
+
+</pre><h3><a name="V2.8b_Procedures"></a>Procedures</h3><pre>
+Fixes bugs:
+ - echogs wasn't always invoked with ./ on Unix systems.
+
+Changes the file name unix-ansi.mak to unixansi.mak, so it can be created
+on a MS-DOS system.
+
+Adds a new "feature", ccinit.dev, which compiles and links the
+initialization files (gs_*.ps) into the executable, just as ccfonts.dev
+compiles and links fonts. If ccinit and ccfonts are both selected, the
+only external file needed at run time is Fontmap. Note that you must have
+a working version of Ghostscript already in order to create a version that
+uses the ccinit feature, just as for ccfonts.
+
+</pre><h3><a name="V2.8b_Utilities"></a>Utilities</h3><pre>
+Fixes bugs:
+ - the ps2image utility didn't put a %! on the first line of the
+output.
+
+</pre><h3><a name="V2.8b_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - The Hercules display driver didn't include definitions for
+outport2 and PAGE_HEIGHT_INCHES, which it uses.
+ - The BGI driver didn't call setactivepage or setvisualpage,
+which it needs to do in general.
+ - The Apple DMP driver declared dmp_print_page rather than
+appledmp_print_page, causing a compilation error.
+
+Changes the X11 driver so that it doesn't use the default foreground and
+background colors: you must set foreground and background explicitly for
+Ghostscript if you want them to be other than black and white
+respectively.
+
+Adds new user-contributed drivers for:
+ - The StarJet 48 inkjet printer;
+ - The GNU/Linux VGALIB display interface.
+ - OS/2 Presentation Manager.
+
+Changes the margins of the Epson driver to 0.2, 0.0, 0.0, 0.0, which
+more accurately reflect the printer's capabilities.
+
+Changes the get_props and put_props device procedures to take property
+list "objects" with a procedural interface, rather than a data structure
+interface. THIS IS A NON-BACKWARD-COMPATIBLE CHANGE. It affects all
+get_props and put_props procedures. Fortunately, there were only a few
+devices that implemented their own get_props and put_props procedures (the
+H-P color printers, and the three window systems -- X Windows, MS Windows,
+and OS/2 PM).
+
+</pre><h3><a name="V2.8b_Platforms"></a>Platforms</h3><pre>
+Fixes bugs:
+ - The meaning of the -p switch for the Watcom compile-and-link
+program was changed between Watcom C/386 versions 8.5 and 9.5, causing the
+make process to malfunction.
+ - The SCFTAB and SCFDTAB modules were omitted from the VMS link
+list.
+
+Adds user-contributed code for OS/2.
+
+Removes the assumption that an 80486 CPU implies the presence of hardware
+floating point, since the 486SX and Cyrix 486SLC don't have it.
+
+</pre><h3><a name="V2.8b_Fonts"></a>Fonts</h3><pre>
+Fixes bugs:
+* - The GS_FONTPATH scanner didn't recognize .PFB fonts beginning
+with %!PS-AdobeFont.
+* - The GS_FONTPATH scanner often didn't recognize .PFB fonts at all.
+ - Type 1 fonts always set the line join, line cap, and miter limit
+to known values, rather than using the current values. (Using the current
+values doesn't make much sense, but it's apparently what the Adobe
+implementations do.)
+ - DISKFONTS didn't work, because of the change in the Ghostscript
+fonts to do a systemdict begin/end (in version 2.7.1).
+
+</pre><h3><a name="V2.8b_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - == didn't produce exactly the same output as the Adobe
+interpreters. (Some automated debugging and testing programs care.)
+ - The CCITTFaxEncode filter could get caught in an infinite loop,
+because it failed to mask a byte datum when scanning for runs of black
+pixels.
+ - The write operator gave an error for values outside the range 0
+to 255, rather than just using the low-order 8 bits.
+ - Some applications call a statusdict procedure named
+setresolution without checking first whether it is present; Ghostscript
+didn't provide one.
+ - Reading from a closed stream caused an error instead of
+returning EOF.
+ - Input streams didn't close automatically at EOF.
+ - findfont was defined as an operator, not a procedure.
+ - closefile on a closed file gave an error. (It isn't obvious
+that the Adobe documentation specifies that it shouldn't, but that's what
+Adobe says they do.)
+ - The LZWDecode filter didn't handle codes representing strings
+longer than the buffer size correctly.
+ - The LZWDecode filter only allowed 4095 codes to be used, rather
+than 4096.
+ - The rand operator produced an infinite string of zeros if
+given 0 or 0x7fffffff as the seed.
+ - When a CDevProc procedure was called, there was an extra
+copy of the character name on the operand stack below the operands of
+CDevProc.
+
+Replaces all stream implementations with new ones designed to allow
+interruption at arbitrary times. ****** The 2-D case of CCITTFaxEncode
+hasn't been converted (but it probably didn't work before, either).
+
+Implements additional Level 2 features:
+ - Type 0 (composite) fonts.
+
+Adds an eexecEncode filter.
+
+Implements setcolorscreen, which was accidentally omitted from 2.7.
+
+</pre><h3><a name="V2.8b_Library"></a>Library</h3><pre>
+Fixes bugs:
+* - In colorimage, if the color space of the image was different
+from the current color space, and the first data values on a scan line
+were zeros, the wrong color could result.
+ - The new flatness testing algorithm could overflow, producing
+straight lines or obvious polygons instead of curves.
+ - Images could fail to display pixels after the first non-blank
+pixel on a line if halftoned color was required. (This bug was probably
+introduced in 2.7.)
+ - Interpolation between transfer map entries didn't work, because
+of a rounding/truncation bug in frac2bits (bug introduced in 2.7.1.)
+ - cshow did an extra grestore at the end.
+
+* Implements a hack to slightly displace 1-bit-wide or -high images. This
+is necessary to work around a bug in TeX (or dvips?), which uses such
+images to draw horizontal and vertical lines without positioning them to
+ensure that they cover device pixel centers.
+
+Adds support for composite fonts (no new client procedures).
+
+</pre>
+
+<hr>
+
+<h2><a name="Version2.7.2b"></a>Version 2.7.2-beta (10/11/93)</h2>
+
+<p>This version was distributed only to alpha testers.
+
+<h3><a name="V2.7.2b_Utilities"></a>Utilities</h3><pre>
+Fixes bugs:
+ - prfont.ps didn't print unencoded characters.
+
+Improves mergeini.ps to remove embedded comments.
+
+</pre><h3><a name="V2.7.2b_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - An error occurring within the scope of an internal .stopped
+didn't pop the command and error name off the stack.
+* - The = and == procedures weren't re-entrant.
+
+* Adds a .writecvs operator that does a cvs to an internal string followed
+by a writestring.
+
+</pre><h3><a name="V2.7.2b_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - grestore freed the path and the clip path in an order that
+was likely to lead to memory sandbars.
+ - moveto + closepath didn't actually close the path.
+ - moveto + reversepath produced an empty path (no moveto).
+ - moveto + closepath + reversepath produced an extra lineto.
+ - reversepath didn't set the current point to the end (i.e., the
+former beginning) of the last subpath.
+
+Adds a "planar" memory device.
+
+</pre>
+
+<h2><a name="Version2.7.1b"></a>Version 2.7.1-beta (10/4/93, not distributed to the public)</h2>
+
+<p>Like 2.7, this version was created to satisfy a contractual
+requirement,
+and will never be distributed to anyone other than the other party to the
+contract.
+
+<h3><a name="V2.7.1b_Documentation"></a>Documentation</h3><pre>
+Documents the GS_OPTIONS environment variable.
+
+Adds a summary of all environment variables to the documentation
+(use.doc).
+
+Documents the existence of a third free viewer built on Ghostscript.
+
+</pre><h3><a name="V2.7.1b_Utilities"></a>Utilities</h3><pre>
+Fixes bugs:
+ - wrfont didn't wrap a systemdict begin / end around the body of
+the font.
+ - wrfont wrote out the Symbol and ZapfDingbats encodings in a way
+that only worked if the encoding was known by name.
+
+Changes bdftops to include an XUID if desired.
+
+Changes bdftops so that it uses 'show' for unknown ligatures, rather than
+executing the characters as subroutines; this makes such ligatures work
+properly with xfonts.
+
+</pre><h3><a name="V2.7.1b_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - The PCL drivers sent a printer reset (&lt;ESC&gt;E) at the beginning
+of every page, instead of only before the first page.
+ - The PCX driver didn't round up the scan line width in the
+header, even though it produced scan lines with the correct (rounded)
+number of bytes.
+
+Adds a new map_rgb_alpha_color procedure. This is a backward-compatible
+change; this procedure defaults to calling map_rgb_color.
+
+</pre><h3><a name="V2.7.1b_Platforms"></a>Platforms</h3><pre>
+Fixes bugs:
+ - On Unix platforms, the value of the TEMP environment variable
+had to end with a '/'.
+ - On MS-DOS systems, printer output to devices other than PRN
+(specifically, LPTn) didn't put the device into binary mode.
+
+Adds FPU_TYPE to the Unix makefiles, with a default value of 1.
+
+Removes the mention of Xmu linking problems on the SunOS platform,
+since the problem no longer exists.
+
+Changes the order of X Windows libraries from Xt X11 Xext to Xt Xext X11.
+This makes the OSF/1 linker happier.
+
+</pre><h3><a name="V2.7.1b_Fonts"></a>Fonts</h3><pre>
+Fixes bugs:
+ - All the fonts originated by Aladdin, and the shareware fonts,
+had UniqueIDs in the 4xxxxxx range, which is only supposed to be used for
+limited-distribution fonts.
+* - When Ghostscript loaded a font, it pushed a scratch dictionary
+on the dictionary stack, rather than userdict. (Note that this fix also
+requires fixing the fonts to include a protective systemdict begin /
+end; see below.)
+* - When loading a font failed, Ghostscript didn't check the font
+name against the default font name properly.
+ - Ghostscript's own fonts didn't include a systemdict begin /
+end to guard against redefinition of names used in the reading
+procedures (e.g., index).
+* - When Ghostscript scanned a .PFB font to get the FontName, it
+didn't skip over the 6-byte header, which could cause confusion or a
+syntaxerror.
+ - Loading a .PFB font that left extra information on the
+operand stack didn't work.
+
+Changes the ZapfDingbats font to use DingbatsEncoding rather than include
+a copy of the encoding in itself, if DingbatsEncoding is known. Changes
+the Symbol font similarly.
+
+Removes eexec encryption from the 4 URW fonts, so they will work with
+DISKFONTS.
+
+Adds shareware Hiragana and Katakana fonts (Calligraphic-Hiragana and
+Calligraphic-Katakana, by Kevin Hartig).
+
+Adds GS on the end of the family names of all of Aladdin's own converted
+fonts.
+
+Replaces many of the Hershey fonts with new ones (mostly Type 1) created
+by Thomas Wolff, who added accents, accented characters, and other
+non-alphabetics. These too now have proper UniqueIDs.
+
+</pre><h3><a name="V2.7.1b_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+* - imagemask interpreted the Decode array incorrectly (inverted).
+ - Running out of memory when constructing a path incorrectly
+signalled a limitcheck rather than a VMerror.
+ - restore didn't purge uncached scaled fonts properly.
+
+Adds alpha (opacity) to the graphics state, and setalpha and
+currentalpha operators.
+
+Redefines erasepage in terms of a new .fillpage operator that fills
+the current page with the current color and then does a sync_output.
+
+Redefines setdevice and putdeviceprops in terms of new .setdevice and
+.putdeviceprops operators that return a boolean indicating whether the
+page needs to be erased. With this change, operators that erase the page
+always call erasepage at the interpreter level rather than calling
+gs_erasepage directly.
+
+</pre><h3><a name="V2.7.1b_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - The null device allowed its size to be reset.
+ - clippath didn't establish a current point if the clipping
+path was empty.
+* - The Type 1 font interpreter (gs_type1_interpret) flattened
+curves even if it was being invoked for charpath.
+ - Colored halftones usually didn't come out with the correct
+phase, and had several other problems.
+ - A show or charpath within a BuildChar procedure didn't work.
+ - Accented characters composed with seac used the base
+character width instead of the composed character width. (The Adobe
+documentation says these must be the same, but some commercial fonts
+don't obey this.)
+ - setcurrentpoint in the accent of a character composed with
+seac didn't take the accent's displacement into account.
+
+Adds an alpha (coverage) value to the graphics state, and
+gs_setalpha/currentalpha procedures. Currently Ghostscript just passes
+the alpha value to the driver; it doesn't attempt to emulate alpha
+handling if the driver doesn't support it.
+
+Redefines gs_erasepage to call gs_fillpage.
+
+Bypasses the fill code if the clipping box is empty. This makes a big
+difference for stringwidth, and doesn't hurt anything else.
+
+Changes frac_1 from 0x7fff to 0x7ff8. This allows exact representation of
+practically all useful fractions, since this number (32760) is
+2*2*2*3*3*5*7*13.
+
+Changes float to double in several matrix routines for better accuracy.
+
+Adds new device properties to implement the deviceinfo operator:
+Colors, GrayValues, RedValues, GreenValues, BlueValues, ColorValues.
+Also adds HWBitsPerPixel and HWColorMap.
+
+Changes the sorting algorithm for halftones to use qsort instead of
+special code.
+
+Changes the Type 1 interpreter so that it uses the current point, rather
+than (0,0), as the character origin.
+
+</pre>
+
+<h2><a name="Version2.7b"></a>Version 2.7-beta (9/20/93, not distributed to the public)</h2>
+
+<p>This is the first of a series of beta-only versions planned for
+release
+between 2.6.n and 3.0. This version, in particular, was created to
+satisfy a contractual requirement, and will never be distributed to anyone
+other than the other party to the contract.
+
+<h3><a name="V2.7b_Documentation"></a>Documentation</h3><pre>
+Fixes bugs:
+ - The "HP XLFD extensions" to X11R5 are not specific to H-P
+platforms.
+ - The configuration generation script used rm rather than rm -f.
+ - gs.1 was installed in $(docdir) rather than $(mandir);
+$(mandir) wasn't defined.
+ - ansi2knr.1 was installed in $(docdir), which was
+inappropriate because ansi2knr itself wasn't installed anywhere.
+
+Moves documentation for versions 2.4.x and 2.5.x to history.doc.
+
+Moves the documentation on how to add devices to the configuration
+from devs.mak to make.doc.
+
+Changes the name of readme.doc to current.doc, since the presence of
+two "readme" files was confusing to users.
+
+Documents how to use the Microsoft Windows PostScript printer driver
+to convert TrueType fonts to Type 1 fonts embedded in the document.
+
+Corrects several errors in the documentation of the get_bits driver
+procedure.
+
+Documents the fact that X11R3 is no longer supported.
+
+Removes the last references to "Ghostscript" from the comments in the
+gs_*.ps files. The only remaining reference, other than the boilerplate
+comments at the beginning of each file, is in the message at the end of
+gs_init.ps.
+
+Documents the use of WMAKEL rather than WMAKE with the Watcom compiler.
+
+</pre><h3><a name="V2.7b_Procedures"></a>Procedures</h3><pre>
+Fixes bugs:
+* - The Unix install script used gs rather than $(GS) as the name of
+the executable.
+* - The Unix install script didn't copy gs_dbt_e.ps to $(gsdatadir).
+ - genconf.c used ps2 as a variable name; ps2 is a predefined
+preprocessor symbol in the VSC compiler used by IBM.
+ - @-expansion didn't interact properly with -- and -+.
+ - The Unix install script didn't copy COPYING to $(docdir),
+and copied README to $(gsdatadir) rather than $(docdir).
+ - ps2ascii used /bin/sh -f, which is an incorrect flag.
+
+Removes all uses and mentions of USG (a now-obsolete GNU convention)
+as a synonym for SYSV.
+
+Removes filter.dev and dps.dev from FEATURE_DEVS if level2.dev is
+included, since they don't add anything beyond level2.dev.
+
+Changes the ccgs script to explictly remove the old .o file before
+doing the mv, for the benefit of people who have changed mv to prompt
+before overwriting. Changes the configuration script to use rm -f
+for the same reason.
+
+Changes the -Z switch so an empty list of options does nothing, rather
+than turning on all options.
+
+Adds a -@ switch which is like -- and -+ except that it does
+@-expansion of arguments.
+
+Changes genconf so it takes patterns from the command line that describe
+how to write the linker control files, rather than having the patterns
+built in.
+
+Changes -d and -D so that if no value is supplied, the default is
+true rather than null.
+
+</pre><h3><a name="V2.7b_Utilities"></a>Utilities</h3><pre>
+Fixes bugs:
+* - The ps2ascii script still referenced ps2ascii.ps under its
+old name gs_2asc.ps.
+* - ps2image.ps had a 'pop' missing in the written-out
+definition of 'max' in the boilerplate code it put at the beginning
+of compressed files.
+* - ps2image.ps got a typecheck if a scan line had no repeated
+data in it anywhere.
+ - wrfont.ps didn't handle CharStrings or Subrs that weren't
+strings.
+ - mergeini.ps produced an init file that incorrectly
+attempted to load the Symbol and Dingbats encodings dynamically.
+
+Removes the gsview.bat file, since it was confusingly named and not
+generally useful.
+
+Changes bdftops back to using encrypted CharStrings, for compatibility
+with Adobe interpreters, but also changes lenIV to 0, to save a little
+more space.
+
+Changes the traceop utility so it makes traced operators appear to be
+operators, and so it will replace a definition in systemdict if explicitly
+requested to do so and systemdict is writable.
+
+Adds a printafm utility for printing the metrics of fonts in AFM format.
+
+</pre><h3><a name="V2.7b_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - The cdj driver was missing a few type casts that were needed to
+satisfy pedantic compilers.
+ - For banded devices, many of the non-displaying target routines
+were getting called with the original device as the first argument, not
+the target device. (This didn't make any difference in practice, because
+gdev_prn_open explicitly copied the non-rendering procedures back into the
+procedure vector.)
+* - The X driver didn't catch and discard bogus errors on
+XFreeColors, which faulty servers generate.
+* - The X driver gave up on color allocation too easily.
+* - The X driver dynamic color table size could become negative.
+* - x_lookup_font could return platform fonts of very small sizes,
+which have very inaccurate metrics.
+* - The ESCP/2 driver was incorrectly named gdevescp2 in devs.mak.
+ - The Apple DMP driver used #if 0 / #endif instead of comment
+brackets, and was incorrectly named "dmp" instead of "appledmp" in
+the source code.
+* - The X driver didn't free dynamic colors at the start of each page.
+* - The X driver didn't bind foreground/background defaults tightly.
+* - The X driver didn't check for GHOSTVIEW_COLORS properly.
+* - The X driver freed too many colors if an allocation request failed.
+* - The X driver didn't check return value of gs_malloc for being NULL.
+* - The DeskJet/LaserJet driver used an incorrect command for
+end-of-page.
+* - The DeskJet/LaserJet driver incorrectly reset the printer at the
+beginning of every page.
+* - The PCX driver put an old version number in the header, and
+didn't pad scan lines to an even number of bytes.
+ - The BMP driver used a variable named `quad', which is a
+reserved word on some platforms.
+* - The TIFF driver didn't handle A4 or B4 size paper correctly.
+* - The X11 driver incorrectly demanded the Xmu library, which was
+not needed and which caused link errors on some versions of SunOS.
+* - X11 font matching scheme was too loose, causing overlaps and
+other problems.
+* - X11 Font Extensions (rotated and mirrored fonts) did not work
+properly on NCD terminals.
+* - When freeing the rgb cube/gray ramp, the parameters to gs_free()
+did not exactly match the parameters to gs_malloc().
+* - Ghostscript failed to warn the user when it could not allocate
+the original color cube/gray ramp and dropped back to a smaller
+cube/ramp, or from color to mono.
+* - x_release could cause Ghostscript to fail if a font was freed
+after the device was closed.
+ - The X driver continued to ask the server for colors even after a
+request failed, causing colored images to display very slowly.
+
+* Adds a pcxgray driver to provide 8-bit gray scale output in PCX format.
+
+Adds a pcx24b driver to provide 24-bit RGB color PCX output.
+
+* Adds a LaserJet 4 driver.
+
+Adds a user-contributed driver for the DEC LA70 (very similar to the LA75).
+
+Substantially improves the performance of the PxM drivers by eliminating
+an unnecessary copying step and by writing each scan line with a single
+fwrite when possible.
+
+Moves the gray-scale and 24-bit RGB device color mapping routines to
+gxcmap.c from gdevpcx.c and (nowhere).
+
+Allows window granularities smaller than 64K in the VESA driver.
+
+Changes the LaserJet margins again.
+
+</pre><h3><a name="V2.7b_Platforms"></a>Platforms</h3><pre>
+Fixes bugs:
+ - Platforms where stat doesn't return a st_blocks value
+computed the block count wrong.
+ - In gp_vms.c, the call on SYS$FILESCAN needed two uint *s
+rather than a long * and a struct *.
+* - The VMS script files referenced IBSCAN instead of ISCAN2,
+and omitted GDEVXXF.
+* - The UUENCODEd icons for the MS Windows platform were omitted
+from the fileset.
+* - On MS-DOS systems, filenameforall didn't interpret * alone
+as a pattern matching all files.
+
+Adds wildcard matching capability to filenameforall under Unix.
+
+Removes gp_file_status from the platform interface, since all
+platforms provide identical stat calls in the C library.
+
+Adds DesqView/X (using djgcc and go32) as a platform.
+
+Removes the S3 driver from the standard PC configurations.
+
+Adds documentation for compiling Ghostscript on the Intergraph Clipper.
+
+Updates the documentation to add a better list of X Windows font
+names for the Sun platform.
+
+</pre><h3><a name="V2.7b_Fonts"></a>Fonts</h3><pre>
+
+Creates an external file (gs_dbt_e.ps) with the ZapfDingbats encoding
+(actually in 2.6.1, but not documented there).
+
+Changes the names of the Cyrillic fonts to Shareware-Cyrillic-Regular
+and Shareware-Cyrillic-Italic, keeping Cyrillic, Cyrillic-Regular,
+and Cyrillic-Italic as aliases.
+
+* Removes the requirement that the FontName in the font file be the same
+as the name in Fontmap. (This requirement led to the need for aliases,
+and was extremely confusing to users.)
+
+* Adds a GS_FONTPATH environment variable containing a list of directories
+that should be scanned automatically for fonts.
+
+* Gets rid of the Ugly font, and changes the default to the IBM Courier
+font, which is freely distributable.
+
+</pre><h3><a name="V2.7b_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - cvs didn't check for stack underflow.
+* - zht2.c didn't include alloc.h.
+* - execstackoverflow cleared the e-stack instead of just
+cutting it back.
+ - if and ifelse incorrectly reported typecheck instead of
+stackunderflow.
+ - Copying a dictionary could alter some items even if a later
+item causes an invalidaccess error because of an attempted store of a
+local object into global VM.
+ - bitshift and cvrs assumed that longs occupied 32 bits.
+* - exitserver didn't check the password, and always succeeded.
+ - Font loading didn't suppress all output messages if QUIET
+was set.
+* - The interpreter incorrectly pushed its exit procedure on
+the e-stack if it was called again after an interrupt.
+* - The interpreter didn't treat timeout like interrupt in
+terms of re-executing the current operation.
+* - `show' operators popped their operands before they were
+sure they wouldn't be interrupted.
+* - rotate with a matrix operand didn't check for multiples of
+90 degrees.
+ - In the system name table, ge was misspelled eg, and
+pathforall was misspelled pathfoall.
+* - file_close_file attempted to free the buffer even if it was an
+externally supplied string (specifically, the argument of gs_run_string).
+ - setprintername (in gs_statd.ps) set printername rather than
+.printername.
+
+Implements additional Level 2 features:
+ - Indexed color space with lookup procedure.
+ - sethalftone, except for the transfer function override,
+ and currenthalftone.
+
+Implements OtherSubrs for indices greater than 3 (required for
+MultiMaster fonts).
+
+Implements black generation and undercolor removal.
+
+Changes `store' from a C procedure to a PostScript procedure.
+
+Changes idiv back so it requires integer operands, per the Adobe
+documentation but not per some old Adobe interpreters.
+
+* Adds many new paper sizes to gs_statd.ps. It now includes ISO a0-a10
+and b0-b10, and CAD sizes archA-archE.
+
+Implements `status' for non-%os% files. (This is currently a no-op,
+but the framework is there.)
+
+Changes the error handler so it normally uses = rather than == to print
+the operand stack, to avoid recursive errors.
+
+* Adds time slicing capability to the interpreter.
+
+Implements setcolorscreen/currentcolorscreen.
+
+</pre><h3><a name="V2.7b_Library"></a>Library</h3><pre>
+Fixes bugs:
+* - Rectangles with vertices specified in clockwise order were
+drawn as 0-width lines.
+* - The string matching function reported that 'abcdefg'
+matched the pattern 'abcde'.
+* - The bounding box of non-rectangular clipping paths was not
+being marked as valid, so cached characters would simply get
+discarded as being outside the bounding box.
+ - erasepage filled the page with the device's white color,
+not with gray level 1 passed through the transfer function.
+* - Colors with equal R/G/B or C/M/Y components were rendered
+incorrectly if the 3 or 4 transfer functions were not all the same.
+* - Because of a bug in rc_unshare, using CIE color would give
+random errors (such as /invalidaccess in --for--).
+* - setbbox didn't round the coordinates properly, which could
+cause erroneous rangecheck errors with coordinates on the edge of the
+box.
+* - Color halftones "flipped over" at the 50% point, inverting
+foreground and background.
+ - Quite a few places assumed that longs occupied 32 bits.
+* - kshow passed an incorrect c1 value to the procedure.
+ - The debugging code in update_x_list in gxfill.c didn't take
+into account the possibility that the active line at x_first might be
+deleted.
+ - gx_image_cached_char called the xfont render_char procedure an
+extra time if it failed with required=0 and succeeded with required=1.
+(This was just a small inefficiency, not a logic bug.)
+ - Non-rectangular clipping regions weren't computed correctly,
+because accum_add_rect didn't handle overlapping rectangles.
+ - Drivers didn't report file system errors (such as file system
+full) as an ioerror.
+* - setdevice didn't reset the charpath and setcachedevice flags.
+ - The Zortech compiler produced wrong code for the uid_equal
+macro; uid_equal is now a procedure.
+
+Passes OtherSubrs arguments back to the caller correctly for indices
+greater than 3.
+
+Implements black generation and undercolor removal.
+
+Removes gdev_mem_ensure_byte_order, which was no longer used or useful.
+
+Removes gstdev.c (device tracing), since it hasn't been used in a
+long time and is of little value given a reasonable debugger.
+
+Changes the interface to the xfont char_metrics and render_char
+procedures to allow them to return 1.
+
+Changes 32-bit memory devices so they use CMYK color mapping rather
+than RGB mapping with an unused byte.
+
+Implements gs_setcolorscreen/currentcolorscreen.
+
+Implements Level 2 halftones, except for the transfer function override.
+
+Implements a hack to make zero-width rectangles display as one pixel wide,
+to work around a bug in the Microsoft Windows PostScript driver.
+Currently the hack only works for vertical lines, not horizontal ones.
+
+</pre>
+
+<hr>
+
+<h2><a name="Version2.6.1"></a>Version 2.6.1 (5/28/93)</h2>
+
+<p>This is primarily a bug-fix release for 2.6, with a couple of minor
+additions.
+
+<h3><a name="V2.6.1_Documentation"></a>Documentation</h3><pre>
+
+Adds proper `man' pages ansi2knr.1 and gs.1.
+
+</pre><h3><a name="V2.6.1_Procedures"></a>Procedures</h3><pre>
+Fixes bugs:
+ - The Unix makefile produced an incorrect linker command if
+EXTRALIBS was not empty.
+ - The Unix install commands didn't copy devices.doc,
+ps2epsi.doc, and xfonts.doc to the documentation directory.
+ - echogs.c didn't include &lt;sys/types.h&gt;, which is needed for
+time_t on some systems.
+ - malloc_.h used &lt;malloc.h&gt; rather than &lt;stdlib.h&gt; on
+NeXTStep systems.
+
+Changes the configuration procedure to use a C program rather than
+complex shell scripts.
+
+</pre><h3><a name="V2.6.1_Utilities"></a>Utilities</h3><pre>
+Fixes bugs:
+ - The boilerplate produced by ps2image used the 'max'
+operator, which is not a standard PostScript operator.
+ - The winmaps.ps utility had 'floring' instead of 'florin' in
+the OEMEncoding table.
+ - quit.ps was omitted from the PC distribution.
+
+Changes the name of the dicttomark procedure to .dicttomark.
+
+Renames gs_2asc.ps as ps2ascii.ps, so it matches the names of the
+script files.
+
+</pre><h3><a name="V2.6.1_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - The pbmraw driver was writing out RGG instead of RGB values.
+ - The X11 driver used NULL in a place where it should have
+used None.
+ - For multi-file output, the GIF driver didn't write a header
+at the beginning of each file.
+ - The Epson driver didn't honor the -A4 compilation switch,
+didn't put (0,0) at the physical corner of the page, and was too
+liberal about using tabs instead of spaces.
+
+Replaces the color handling algorithms in the X Windows driver with
+new, much better ones.
+
+Makes the PC display drivers recognize the -A4 compilation switch,
+like the printer drivers.
+
+Adds new user-contributed drivers:
+ - A driver for Epson printers that use the ESC/P 2 control
+language, such as the Stylus 800.
+ - A driver for the Apple Dot Matrix Printer and Imagewriter.
+
+Adds a new get_xfont_device driver procedure. This is a
+backward-compatible change, since there is a sensible default.
+
+</pre><h3><a name="V2.6.1_Platforms"></a>Platforms</h3><pre>
+Fixes bugs:
+ - On VMS, gconfig.h didn't have #include "gsconfig.h" as its
+first line.
+ - gconfig.c compiled incorrectly on the RS/6000 because the
+compiler evaluated a constant of the form (x&lt;&lt;y)+z incorrectly.
+ - Quite a few files that used the mem... functions didn't
+include memory_.h, which caused trouble on some bsd4.2 systems.
+ - The definition of zfont_char_xglyph confused one of the AIX
+compilers.
+ - On VMS, DEC C allows extra arguments for fopen, but gcc doesn't.
+ - On the MS Windows platform, 2.6 used gdevwddb rather than
+gdevwdib; the latter is almost always faster.
+ - The PC .zip files didn't include the Windows .ICO and .RES
+files in either GSEXE.ZIP or GSFILES.ZIP.
+
+On PC platforms, adds an option (FPU_TYPE=-1) to optimize for
+machines lacking a floating point processor.
+
+</pre><h3><a name="V2.6.1_Fonts"></a>Fonts</h3><pre>
+
+Adds 4 new fonts contributed by URW. These have a URW copyright and
+are governed by the GNU License.
+
+Documents the fact that font names in Fontmap can be strings, not
+only names.
+
+Adds DingbatsEncoding as a predefined encoding (in addition to
+Standard, ISOLatin1, and Symbol).
+
+</pre><h3><a name="V2.6.1_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - memchr (used in zfile.c) isn't available on all platforms.
+ - languagelevel was defined as an operator rather than an
+integer.
+ - iccfont.c referred to name_StandardEncoding instead of
+#include'ing font.h and referring just to StandardEncoding.
+ - The CCITTFaxDecode filter didn't work on 32- (or 64-) bit
+machines, because of a bug in more_bits().
+ - The structures recording an allocation within the scope of
+a save could get allocated unnecessarily, because they weren't
+properly marked as free when an array was freed.
+
+Renames the following Ghostscript-specific operators by adding a '.'
+at the front: makeoperator, setdebug, setmaxlength, stringmatch,
+type1decrypt, type1encrypt.
+
+Adds a real implementation of glyphshow.
+
+</pre><h3><a name="V2.6.1_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - Discarding fractional character coordinates in the Type 1
+rasterizer led to some rendering anomalies (e.g., characters 1 pixel
+too high).
+ - If a font had a non-standard encoding (i.e., not
+StandardEncoding, ISOLatin1Encoding, or SymbolEncoding), Ghostscript
+would never invoke the platform font code.
+ - The RGB to HSB color conversion algorithms produced
+nonsensical values.
+ - struct cached_char_s was defined redundantly in gxcdir.h,
+causing compilation problems on some systems.
+ - 32-bit color devices didn't work properly on little-endian
+machines (arrange_bytes in gdevmem2 was wrong).
+ - The scaled font cache could confuse two fonts with the same
+UniqueID and different Encodings.
+ - Under many common circumstances (first use of a character
+was with stringwidth, the font was renamed, the font encoding was
+changed), xfonts would not be used.
+
+Adds gs_glyphshow.
+
+</pre>
+
+<h2><a name="Version2.6"></a>Version 2.6 (5/9/93)</h2>
+
+<p>The main new feature in this release is the ability to use platform
+fonts. It also adds many more Level 2 PostScript facilities.
+
+<h3><a name="V2.6_Documentation"></a>Documentation</h3><pre>
+
+Corrects some errors in the documentation of the makeimagedevice operator.
+
+Adds operand and result types to the comments at the beginning of all the
+operators.
+
+Adds new sections on installation in use.doc.
+
+Reinstates history.doc as a repository for old and no longer interesting
+history information.
+
+Adds a new file, devices.doc, with documentation for specific devices.
+
+Points out that font2c must be run with a Fontmap that includes the fonts
+being converted, and that its arguments must be quoted with "" on VMS
+systems.
+
+Notes that the font name in the Fontmap must be the same as the FontName
+in the font.
+
+Adds a list of the Level 2 facilities not provided by Ghostscript.
+
+Identifies bug-ghostscript@prep.ai.mit.edu as an alias for the
+gnu.ghostscript.bug newsgroup.
+
+Points out explicitly that -sOutputFile=- sends output to stdout, and
+requires using the -q switch.
+
+Documents the use of tar_cat to construct the Unix makefiles.
+
+Adds a new file, xfonts.doc, that describes the external font interface.
+
+Documents the fact that drivers must use gs_malloc and gs_free rather than
+malloc and free.
+
+Documents the *.sh (shell script) files.
+
+Adds brief documentation on some additional development tool .ps files.
+
+Documents the TEMP and GS_OPTIONS environment variable.
+
+Points out the need to run Windows in 386 Enhanced mode on machines
+that have less than 6 Mb of RAM.
+
+Consolidates documentation on compiler switches in make.doc (some of
+it had been in the unix*.mak files).
+
+</pre><h3><a name="V2.6_Procedures"></a>Procedures</h3><pre>
+Fixes bugs:
+ - \'s in arguments following -- were doubled.
+
+Includes the full set of filters automatically if the level2 feature
+is selected.
+
+Extends DEVICE_DEVS... up to DEVS9. Adds DEVICE_DEVS1 as well.
+
+Renames turboc.mak and tbcplus.mak as tc.mak and bc.mak.
+
+Makes @-files use the library path (GS_LIB, -I).
+
+Changed the Unix install script to use install &lt;file&gt; &lt;destfile&gt;
+rather than install &lt;file&gt; &lt;directory&gt;.
+
+Adds a GS_OPTIONS environment variable that acts like an implicit @-file
+at the beginning of the command line (i.e., may contain switches and
+initialization files).
+
+Renames sym__enc.ps as gs_sym_e.ps.
+
+Adds a user-contributed shell script for using Ghostscript with an
+H-P printer spooler.
+
+Adds level1.ps to the set of installed utility files.
+
+Extends the TEMP environment variable (the directory for scratch
+files) to work on Unix as well as MS-DOS.
+
+Changes the MS Windows makefile to generate gswin.exe rather than
+gs.exe, and the Watcom makefile to generate gs386.exe.
+
+Moves the "product" string from gs_init.ps to iinit.c.
+
+Adds a GS macro to the makefiles, to allow choosing the name of the
+executable.
+
+</pre><h3><a name="V2.6_Utilities"></a>Utilities</h3><pre>
+Fixes bugs:
+* - font2c did the wrong thing (still) for fonts that didn't
+use StandardEncoding, ISOLatin1Encoding, or SymbolEncoding.
+* - impath.ps had a fatal bug (wrong operand order for
+charstack_write) that caused bdftops to fail.
+ - gslp didn't wrap or truncate lines.
+ - gslp didn't handle tabs in a second or subsequent column
+properly.
+ - The definition of ashow in gs_2asc.ps incorrectly undid the
+increment following the last character.
+ - The definition of awidthshow in gs_2asc.ps failed to pop
+two entries from the stack, and also tested the character against the
+wrong value.
+
+Adds a shell script (sysvlp.sh) that interfaces Ghostscript with the
+System V 3.2 lp interface.
+
+Adds ps2ascii and ps2epsi script/batch files.
+
+Adds a new utility, mergeini.ps, for concatenating all the
+Ghostscript initialization files into a single file, optionally
+removing comments and blank lines.
+
+Adds new switches to gslp:
+ -q: suppress all printed output.
+ --detect: check whether the file begins with %!, and if so,
+ interpret it directly as a PostScript file.
+ --first-page &lt;page#&gt;: replaces the former -P switch.
+ --last-page &lt;page#&gt;: replaces the former -Q switch.
+ --(heading|footing)-(left|center|right) &lt;string&gt;: define
+ headers/footers. # inserts the page number.
+ --margin-(top|bottom|left|right) &lt;inches&gt;: define margins.
+ --spacing &lt;n&gt;: for double, triple, etc. spacing.
+Also makes gslp ignore all the enscript flags it doesn't implement.
+
+Adds an option to wrfont.ps to do encryption at read-in time. (This
+allows much better compression of the standard Ghostscript fonts.)
+Changes bdftops to use this option.
+
+Changes gslp to accept wild cards in file names.
+
+Replaces landscap.ps with a new one contributed by a user.
+
+Changes the compression scheme used in ps2image to a much more
+effective one. Writing images is much slower than with the previous
+scheme, but reading is not.
+
+</pre><h3><a name="V2.6_Platforms"></a>Platforms</h3><pre>
+Fixes bugs:
+ - SCFDTAB and SCFTAB were omitted from the VMS module lists.
+ - Function prototypes were not being used with the Watcom
+compiler.
+ - On MS-DOS platforms, if the value of the TEMP variable had
+a trailing : or \, Ghostscript appended a \ anyway.
+ - Under Windows, changing the size or resolution of the image
+closed and reopened the window.
+ - Ghostscript would not build correctly with the Watcom compiler
+if DOS4G=quiet was not set, because the DOS4GW copyright message was sent
+to stdout.
+* - Finally gets Ghostscript to run properly on the RS/6000, by
+adding a compiler bug workaround to arc_add and arc_either.
+* - Finally gets Ghostscript to compile properly on Sun SPARC
+systems, by adding a compiler bug workaround in scan_number.
+
+Changes the default MS-DOS configuration from 8086/8088 to 80286.
+
+Adds all the SuperVGA drivers to the BC++ and Watcom executables
+(except for the VESA driver in the Watcom executable).
+
+Adds a makefile (msc.mak) for the Microsoft C/C++ 7.0 platform. This
+is currently a MS-DOS, not a MS Windows, platform.
+
+Changes gp_enumerate_files_init so it takes a gs_memory_procs *, not
+separate proc_alloc_t and proc_free_t arguments; also, it must
+enumerate precisely the requested set of files, not a superset. THIS
+IS A NON-BACKWARD-COMPATIBLE CHANGE. It affects all gp_*.c files.
+
+Adds the P*M drivers and bit.dev to the standard configuration on
+Unix platforms.
+
+Changes the Watcom makefile so it uses the WATCOM environment variable (by
+default) as the base directory for the Watcom executables.
+
+Adds the MS Windows COMMDLG.DLL and SHELL.DLL files to the set of
+files incorporated in GSEXE.ZIP, since the new MS Windows code uses
+them, and they aren't provided with Windows 3.0.
+
+Makes major revisions to the MS Windows platform and driver code, to
+support the gsview front end, and also to remove the dependence on the
+Borland EasyWin library. NOTE: Compiling the MS Windows code now requires
+Borland C++ 3.1 (not 3.0).
+
+Changes time_.h so that Ghostscript will compile and run on A/UX.
+
+Changes the MS-DOS implementation of file enumeration so it always
+treats \s in the file name as literal characters, not escapes, unless
+there are two \\s in a row. This does the most sensible thing given
+the DOS file naming conventions.
+
+Adds a %pipe% file device under Unix.
+
+Adds a makefile for Watcom C under MS Windows. This is very preliminary;
+in particular, NO display output is supported.
+
+</pre><h3><a name="V2.6_Fonts"></a>Fonts</h3><pre>
+Fixes bugs:
+ - fonts.mak referred to ncri and puti rather than ncrri and
+putri.
+ - cyr and cyri had the wrong protection.
+ - The Hershey fonts left the font on the stack when they were
+loaded.
+* - The FontName of an aliased font was the original FontName
+from the file, not the alias.
+* - Fontmap.BTS had incorrect entries for AvantGarde-Demi and
+AvantGarde-DemiOblique.
+ - Ghostscript pushed userdict, rather than an empty writable
+dictionary, onto the stack when loading a font, leading to name clashes.
+
+Adds a new cfonts.mak with a full set of rules for compiling all the
+standard Ghostscript fonts (except the Hershey fonts) into C.
+
+Adds UniqueIDs to the Hershey fonts, and removes the UniqueIDs from
+the Hershey entries in the Fontmap.
+
+Adds a new Fontmap for VAX/VMS with DECWindows/Motif.
+
+Changes MakeHersheyFont so it takes the encoding as an additional
+parameter, and changes the Hershey-Symbol font to use SymbolEncoding.
+
+</pre><h3><a name="V2.6_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - The !@*&amp;^%#@$ PCL drivers *still* didn't do the right thing
+about vertical spacing: the &lt;ESC&gt;*p+&lt;n&gt;Y command works on all PCL 3,
+4, and 5 printers *except* the LaserJet IIp.
+ - The cdj driver used recursive macros (height, t_margin,
+b_margin) that not all compilers handled correctly.
+ - The djtc driver used some assignments including =*, which
+some compilers dislike.
+ - The S3 driver wouldn't compile correctly with the Watcom
+compiler.
+ - The makefile entry for the S3 driver was wrong.
+ - The SuperVGA drivers returned an error, rather than using
+the highest available resolution, if a too-high resolution was
+requested.
+ - The GIF driver produced an incorrect header for images
+wider or taller than 32K pixels.
+ - The GIF driver wasn't able to handle multi-page documents
+correctly.
+ - The margins on the DeskJet were still not correct.
+ - Some ANSI C compilers rejected a complex expression in
+gdevpccm.c.
+ - Printer drivers didn't recover cleanly from problems in
+opening the scratch files.
+ - The BJ-10e driver used the same name `out' for a label and
+a variable.
+ - The SCO ODT compiler couldn't handle sizeof(ppdev-&gt;fname).
+ - The Epson driver used the wrong value for ESC in the
+initialization string.
+
+Adds new drivers:
+ - Drivers to produce MS Windows .BMP format output.
+ - A new ATI Wonder display driver (800x600, 16 colors) and a
+1024x768 mode for the existing driver.
+
+Adds new user-contributed drivers:
+ - A driver for the Tektronix 4693d color printer. This carries a
+university copyright.
+ - A driver for the SPARCprinter.
+ - A driver for the Canon BJ200 printer.
+ - A driver for the IBM ProPrinter.
+ - A driver for the DEC LJ250 printer, which has a
+PaintJet-compatible mode.
+ - A replacement driver for the Sony NWP533.
+ - A driver that writes TIFF/F (Group 3 fax) files. This carries
+an external copyright.
+ - A driver for the C.Itoh M8510 printer.
+ - A driver for the Okidata MicroLine 182 9-pin dot-matrix printer.
+ - A Hercules Graphics driver.
+ - A driver for printers under MS Windows.
+ - A driver for direct frame buffer addressing under SCO Unix
+and Xenix and AT&amp;T SVR4.
+
+Changes the get_bits driver procedure so it always reads a single
+scan line, and optionally does not copy the data. THIS IS A
+NON-BACKWARD-COMPATIBLE CHANGE. However, this change does not affect
+any existing printer driver, since these all go through intermediate
+routines in gdevprn.c.
+
+Changes gdevprn.h, and the relevant printer drivers, so that -DA4
+will change the default paper size for any printer driver.
+
+Allows the use of NULL or 0 for default procedures in the driver
+procedure vector.
+
+Adds an optional map_cmyk_color procedure to the driver procedure
+vector.
+
+Changes the Epson driver so that the minimum amount of white space
+required to use a tab is an easily changed parameter.
+
+Changes the BGI driver to use separate segments for the Borland
+device drivers, to reduce the risk of overflowing a segment.
+
+Adds an optimization option (normally enabled) to the PGM and PPM drivers
+such that they revert to PBM or (for PPM) PGM if the page can be
+represented that way.
+
+Adds a new (optional) driver procedure to get the procedure vector
+for external fonts.
+
+Adds an argument to gp_open_printer to indicate whether the file should be
+opened in binary or text mode. THIS IS A NON-BACKWARD-COMPATIBLE CHANGE.
+However, this change does not affect any existing printer driver, since
+these all go through intermediate routines in gdevprn.c.
+
+Changes the LN03/LA50/LA75 driver so it uses a text record mode to open
+the output file under VMS (by adding an argument to gp_open_printer to
+indicate this.)
+
+Allows (indeed, encourages) drivers to use far_data to declare the device
+structure, primarily to avoid overflowing the 64K data segment under MS
+Windows. Changes the file output drivers and many of the printer drivers
+to declare their device structures as far_data.
+
+Replaces the AT&amp;T 3B1 driver with an updated version (from the same
+contributor).
+
+Changes the Epson BJ driver and the SPARCprinter driver so they align
+the (0,0) point of the page with the physical corner of the paper
+rather than with the origin of the printable area.
+
+Removes the EIZO MDB-10 driver, since it caused complications for the
+EGA and VGA drivers and is not a widely used device.
+
+</pre><h3><a name="V2.6_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - The entry for the copydevice operator in the operator table
+was initialized incorrectly.
+ - printobject and writeobject didn't handle nested arrays.
+ - restore didn't properly close the current file (if
+appropriate), causing an invalidaccess error.
+ - buildfont required the presence of a valid, 4-element
+FontBBox. (The Red Books say it's required, but Adobe interpreters
+don't require it; some DEC software generates a 3-element FontBBox.)
+ - resourceforall had several bugs; it didn't do even
+approximately the right thing. There were quite a few other problems
+with the implementation of resources.
+ - setfont, makefont, and scalefont would accept a font with
+no FID entry.
+* - Loading a .PFB font left the file open (until the next
+restore or quit).
+ - The default (null) font didn't include a PaintType entry,
+which some PostScript files expected.
+* - The ASCIIHexDecode filter sometimes thought the underlying
+stream was at EOF even when there was (at most one buffer's worth of)
+data left.
+ - iscan.c included &lt;ctype.h&gt; before std.h, causing type name
+clashes on some systems.
+* - save and restore didn't handle the pointers in the graphics
+state correctly; for example, the current font wasn't restored
+properly.
+ - Binary object sequences at the top interpreter level didn't
+get executed immediately.
+ - On high-resolution devices, the default transfer function
+converted almost-white grays to very light grays rather than white.
+ - The `string' operator was checking the string length
+against max_uint rather than max_ushort, which could cause invalid
+lengths to be accepted.
+* - deviceinfo caused a stackunderflow error.
+* - idiv could give incorrect results for quotients or
+remainders that didn't fit in 24 bits.
+* - The ASCII85Encode filter padded trailing bytes with 1's
+rather than 0's.
+* - The ASCII85Decode filter had a typo that produced incorrect
+results if there were exactly 2 trailing bytes.
+ - findlibfile didn't push a copy of the file name if it was
+the name of a special (%) file.
+ - setduplexmode was not defined in statusdict, causing
+/undefined errors from some poorly designed input files.
+* - The CCITTFaxDecode filter had several bugs in 2-D decoding.
+* - The ASCII85Decode filter didn't read ahead to detect EOD if
+it fell precisely on a buffer boundary.
+ - If a file mentioned on the command line redefined `start',
+Ghostscript would run the new definition rather than the built-in one
+after processing all the files on the command line.
+ - The SCO ODT compiler couldn't handle the conditionals in the
+ngetc (iscan.c) and sgetc* (stream.h) macros.
+ - makefont and scalefont didn't cache the PostScript dictionaries
+for scaled fonts.
+ - Changing the elements of the Encoding of a font dynamically
+didn't take effect if the character was already cached.
+ - makefont and scalefont didn't add the (undocumented) OrigFont
+and ScaleMatrix entries to the new font.
+* - findfont insisted that the font name be a string or a name.
+ - filenameforall could cause an incorrect transfer of control
+if no files matched the pattern.
+* - ISOLatin1Encoding had hyphen instead of minus at code 45.
+ - restore didn't reset saved_cbot and saved_ctop correctly;
+as a result, some freed blocks could get abandoned rather than put on
+the free list.
+ - Some numerical constants in zarith.c assumed that longs
+occupied 32 bits.
+
+Implements additional Level 2 features:
+ - %device%file names (only the "os" device is provided).
+ - &lt;~ ~&gt; for ASCII-85 strings.
+ - Binary error messages.
+ - BuildGlyph.
+ - CCITTFaxDecode filter entries EndOfBlock, Rows, and
+ (undocumented) FirstBitLowOrder.
+ - {set/current}{color/colorspace/overprint/colorrendering/
+ blackgeneration/undercolorremoval}. (See below under library
+ for limitations.)
+ - Decode for the dictionary form of image.
+ - File access modes a, r/w/a+.
+ - Font entries CDevProc, Metrics2, and WMode.
+ - Font operators cshow, findencoding, rootfont, and
+ setcachedevice2.
+ - glyphshow (emulated with PostScript code).
+ - languagelevel.
+ - realtime.
+ - setbbox.
+ - (Subset of) system and user parameters.
+ - xshow, yshow, and xyshow.
+ - XUIDs for fonts.
+
+Moves the installation of systemdict and the initial allocation of
+globaldict (if relevant) and userdict from gs_init.ps to iinit.c.
+
+Makes Level 2 features dynamically selectable through the
+.setlanguagelevel operator; disables all Level 2 features
+(specifically including automatic dictionary expansion) unless the
+level2 feature is included and active.
+
+Adds the .knownget operator for speeding up system procedures.
+
+Renames the type1addpath operator as .type1addpath; adds an optional
+left side bearing argument; changes it so it does not do the
+setcachedevice, fill, or stroke, but does do a moveto for the
+character width. Changes Type1BuildChar appropriately. (All this is
+needed to make WMode work.)
+
+Removes the .setmetrics operator, which is no longer needed.
+
+* Changes the meaning of the user_errors argument to gs_run_file and
+gs_run_string so that -1 means always return on an error, 0 means
+only return on an error not within a `stopped'.
+
+Adds all the necessary checks and operators for local/global VM, but
+doesn't actually implement local/global mode.
+
+Changes setcachedevice back so that it requires 4 numbers on the
+stack rather than a 4-element array. (It was changed to be the other
+way in release 2.0, but that was because I didn't realize that fonts
+had to have an executable FontBBox, and some of the Ghostscript fonts
+didn't.)
+
+Changes all the filter operators from .filterxxx to .filter_xxx, and
+removes the need to enumerate them in gs_init.ps.
+
+Adds .oserrno and .oserrorstring operators for getting the last OS
+error (in the current context).
+
+Changes gs_finit similarly to gp_exit. Adds gs_exit_with_code that
+takes both an exit status and a Ghostscript error code.
+
+Changes the name of name.h to iname.h.
+
+Adds support for the `interrupt' error (but doesn't provide any standard
+way of generating one, other than through the gp_check_interrupts polling
+function).
+
+Adds copyright to systemdict.
+
+Changes the spot halftone screen to an elliptical screen supplied by
+Berthold K. P. Horn.
+
+Adds a check that the first token in gs_init.ps is an integer. In
+conjunction with other code in gs_init.ps, this should catch all attempts
+to run Ghostscript with a gs_init.ps that doesn't match the executable.
+
+Changes all relevant occurrences of sizeof to size_of in order to
+work with the buggy SVR4.2 C compiler.
+
+Changes gp_exit so it is passed both the Ghostscript error code and
+the exit status code as arguments. This is backward-compatible for
+all but the pickiest compilers.
+
+Adds a call on gp_check_interrupts() after fwrite calls in the stream
+machinery. This prevents lengthy console output from locking out
+other programs.
+
+Changes a couple of occurrences of op_def_ptr in iinit.c to work around a
+`const' bug in Sun's SC1.0 compiler.
+
+Adds a special hack in the 'where' operator to work around a bug in Aldus
+Freehand 2.x.
+
+Changes all empty argument lists from () to (void), which is the ANSI
+C syntax.
+
+Adds a hack to ignore ^[ and ^D^[ tokens, to work around the prologue
+and epilogue emitted by the MS Windows LaserJet IV driver.
+
+Defines the processcolors operator, which should not be needed, but
+is required because of bugs in Lotus 1-2-3 and Adobe PhotoShop.
+
+Changes the allocator (ialloc) to fill all allocated and/or freed
+blocks with a marker if gs_alloc_debug is set, as gs_malloc and
+gs_free already do.
+
+</pre><h3><a name="V2.6_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - 16-bit memory devices stored the bytes of each pixel in the
+wrong order.
+ - copy_mono did the wrong thing when copying 1 source chunk
+to 2 destination chunks with polarity inverted. (This probably
+didn't affect any actual uses of Ghostscript.)
+* - The compile-time check for ints being 2 or 4 bytes used the
+#error directive, which most compilers don't recognize.
+ - arc and arcn didn't do the right thing for degenerate
+(single-point) arcs, or for arcs drawn in the "wrong" direction that
+were multiples of 360 degrees.
+ - charpath did the wrong thing with Type 3 fonts.
+ - copyscanlines gave an error if the buffer was too large.
+ - The copy_mono procedure (used for text and halftones) for
+2- and 4-bit-per-pixel memory and printer devices incorrectly
+incremented the destination pointer after every pixel, instead of
+only after every byte.
+ - The fill_rectangle procedure (used for graphics) for 2- and
+4-bit-per-pixel memory and printer devices, if given any color other
+than all 0's or all 1's, multiplied the X coordinate and width by 2
+or 4, thereby filling the wrong area.
+ - The use of 'data' in both gs_type1_data and gs_font upset
+the VMS compiler.
+ - The `Flex' feature wasn't implemented for Type 1 fonts,
+which caused serious errors in rendering some fonts that use it.
+(Unfortunately, some Adobe fonts violate the specification, so we had
+to implement Flex to always use a curve.)
+* - Stem width adjustment was too eager, producing very strange
+effects on small characters with tight curves (a curve point could
+get snapped to the other side of the open area).
+ - The allocator didn't align structures adequately on
+machines where sizeof(long) or sizeof(char *) was 8 bytes.
+ - The test for IEEE floating point gave an incorrect
+(negative) result on machines where sizeof(long) was 8 bytes.
+ - genarch.c assumed that the result of subtracting two
+pointers was an int, leading to a garbage arch.h file on systems
+where this was false.
+* - The Type 1 font interpreter incorrectly reset the adjusted
+path position to be the same as the unadjusted path position whenever
+it returned control to the client (in particular, for callothersubr),
+leading to discontinuities and distortions in the character shapes.
+* - Accented characters in Type 1 fonts often misplaced the
+accent to the left.
+ - gsmisc.c wouldn't compile on machines with 64-bit pointers,
+because _pad was 0, and ANSI compilers don't accept 0-length arrays.
+ - pathforall got confused if the client procedures modified
+the path.
+ - The command list file representation limited X and Y
+coordinates to 15 bits.
+* - stroke could produce spikes or other garbage for mitered
+joins as a result of stroke adjustment.
+ - The params_size field of the null device was wrong, so
+scaling the null device produced unpredictable results.
+
+Changes monobit memory devices to always store data big-endian. This
+eliminates byte-swapping, at the cost of slightly slower rendering.
+
+Removes the memswab* routines, since they are no longer needed.
+
+Implements gs_cshow_[n_]init, which provides support for cshow, and
+gs_xyshow_[n_]init, which provides support for {x,y,xy}show.
+
+Adds an optional left side bearing argument to gs_type1_interpret.
+
+Changes gs_type1_interpret so it does not do a setcachedevice, fill,
+or stroke, but only appends the character outline to the path
+(including a moveto for the character width.)
+
+Removes gs_setmetrics, which is no longer needed.
+
+Implements gs_setcachedevice2, which provides support for
+setcachedevice2.
+
+Speeds up gsave/grestore by allocating, deallocating, and copying as
+much as possible of the graphics state in a single operation.
+
+Implements gs_{set/current}{color/colorspace/overprint/colorrendering/
+blackgeneration/undercolorremoval}. Device, indexed (with table, not
+with procedure), CIE, and (substituted) separation colors are
+supported; some of the setup code for patterns is also present.
+
+Increases the size of temporary file names in gdevprn.h from 30
+characters to 60.
+
+Changes the character cache to be allocated dynamically in chunks.
+
+Splits gxcache.c into gxccache.c (fast "hit" code) and gxccman.c (all
+other code).
+
+Changes all occurrences of sizeof to size_of in order to work with the
+buggy SVR4.2 C compiler.
+
+Adds a new concept of "external fonts", which allow a driver to
+substitute its own fonts for the ones obtained through the normal
+font machinery.
+
+Changes all empty argument lists from () to (void), which is the ANSI
+C syntax.
+
+</pre>
+
+<hr>
+
+<h2><a name="Version2.5.2"></a>Version 2.5.2 (9/20/92)</h2>
+
+<p>This is yet another bug fix release to (finally!) get the PCL drivers
+working again.
+
+<h3><a name="V2.5.2_Procedures"></a>Procedures</h3><pre>
+Fixes bugs:
+ - The comment in devs.mak for cdjcolor said it used 8 bits
+per pixel, rather than the correct 24.
+
+Adds gsbj/dj/lj/lp and gslp.ps to the installed files on Unix
+systems.
+
+Removes dps.dev and level2.dev from the standard configurations on
+all platforms, since the presence of the setcolor operator was
+causing the output of some common applications to fail.
+
+</pre>
+
+<h3><a name="V2.5.2_Utilities"></a>Utilities</h3><pre>
+Fixes bugs:
+ - font2c produced invalid output for any font that didn't use
+StandardEncoding or ISOLatin1Encoding.
+
+</pre>
+
+<h3><a name="V2.5.2_Platforms"></a>Platforms</h3><pre>
+Fixes bugs:
+ - gp_sysv.c required an extern long timezone.
+
+</pre>
+
+<h3><a name="V2.5.2_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - The PCL drivers were *still* doing the wrong thing about
+zeroing the seed row for Mode 3 compression.
+ - Setting the resolution with -r didn't work under Windows.
+ - The Windows driver got a stack overflow if it was ever
+asked to display a bit image wider than 32 pixels.
+ - The Tseng driver didn't sense the model (ET3000 vs. ET4000)
+correctly.
+
+Adds the eps9high device to the standard MS-DOS makefiles.
+
+</pre>
+
+<h3><a name="V2.5.2_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - gs_run_string used gs_user_errors (a global) rather than
+user_errors (its argument) to control error handling. (This does not
+affect normal operation of Ghostscript, only use as a server.)
+ - eexec popped the top element of the dictionary stack
+afterwards even if the encrypted code had pushed something onto it.
+This caused problems for some badly written PostScript code.
+ - The printed form of real numbers didn't always include a
+decimal point, causing compatibility problems.
+
+Makes -s and -d work for device properties.
+
+Increases the cache limit on large-memory systems.
+
+Adds a check to ensure that the revision of gs_init.ps matches that
+of the interpreter.
+
+Adds the .knownget operator.
+
+</pre><h3><a name="V2.5.2_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - The raster computation in clist_render_init, and the
+computation of state_size in clist_open, didn't widen an operand to
+long, leading to possibly incorrect operation for 24-bit-per-pixel
+printers on MS-DOS systems.
+ - The flatness was set too large for Type 1 characters,
+leading to visible straight edges instead of curves at large sizes.
+ - Type 1 fonts that contained out-of-range coordinates would
+produce garbled output. (This was not a problem with the standard
+Ghostscript fonts, or with Adobe Type Manager fonts.)
+ - gschar0.c wouldn't compile, because it referred to a
+non-existing structure member penum-&gt;chr. (This had no effect on
+Ghostscript's operation.)
+ - The curve flattener required line segments to be no more
+than 8 x the flatness in length, leading to an enormous number of
+segments.
+ - pathforall would cause an addressing fault if the path
+consisted of only a moveto.
+
+Refactors some header files so that std.h is always included before
+any system header file that might include sys/types.h.
+
+Adds logic for removing top and bottom blank rows in cached
+characters. (This is the beginning of compression for the cache.)
+
+Changes the arguments of memswab2/4 from char * to byte *, for more
+accurate type conformance.
+
+</pre>
+
+<h2><a name="Version2.5.1"></a>Version 2.5.1 (9/11/92)</h2>
+
+<p>This is the usual bug fix re-release.
+
+<h3><a name="V2.5.1_Procedures"></a>Procedures</h3><pre>
+Fixes bugs:
+ - The makefile rules for compiled fonts had a circular
+dependency.
+ - `make begin' didn't work properly on all platforms.
+
+Ensures that all batch files end with a newline. (The absence of the
+newline was confusing the GNU diff program.)
+
+Documents the fact that the -dASCIIOUT switch no longer exists.
+
+</pre><h3><a name="V2.5.1_Utilities"></a>Utilities</h3><pre>
+Fixes bugs:
+ - pstoppm didn't `bind' its internal procedures.
+ - grestoreall would undo the output device selected by
+pstoppm.
+
+Changes the utilities for reading and writing Type 1 character
+outlines so they can work with stack representations as well as
+arrays.
+
+Removes the pfbtogs.ps, phonbook.ps, and showpbm.ps utilities from
+the distribution.
+
+Adds a gslj utility to parallel gslp and gsdj.
+
+</pre><h3><a name="V2.5.1_Platforms"></a>Platforms</h3>
+
+<pre>
+Adds the DeskJet 500C drivers (cdeskjet/cdj*) to the MS-DOS / Borland
+C++, MS-DOS / Watcom C/386, and MS-Windows configurations.
+
+Removes the PCX file driver from the MS Windows executable, because
+the static data segment exceeded 64K.
+
+Makes some changes in the Unix System V platform file (gp_sysv.c) and
+in time_.h and unixtail.mak to accommodate the 3B1.
+
+</pre><h3><a name="V2.5.1_Fonts"></a>Fonts</h3><pre>
+Fixes bugs:
+ - The Charter-Italic font was named bchi.pfa rather than
+bchri.pfa.
+ - The Cyrillic fonts (cyr.gsf, cyri.gsf) were omitted from
+the fileset.
+ - Ghostscript incorrectly assumed that all Type 1 fonts had a
+FontInfo dictionary.
+ - .loadfont used false PFBDecode, so a few .PFB fonts would
+get errors because the first eexec byte would be whitespace.
+
+Changes font2c and its supporting code so that compiled fonts are
+location-independent.
+
+</pre><h3><a name="V2.5.1_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - The margins for the H-P printers were still wrong.
+ - The H-P drivers accidentally cleared the compression seed
+row when switching compression modes.
+ - Some of the H-P drivers used the wrong control codes for
+skipping blank lines.
+
+Adds user-supported drivers for the AT&amp;T 3B1 console device, and for
+the NEC P6+ printer.
+
+Updates the SunView driver with a new version supplied by a(nother)
+user.
+
+Changes the X Windows driver so the Ghostscript window doesn't get
+input focus.
+
+Changes the common code for the printer drivers so that if it can
+allocate a full bitmap but there isn't at least a minimum amount of
+memory left afterwards, it switches to banding.
+
+Changes the Windows driver so it handles devices with more than 8
+bits per pixel. (We haven't been able to test this.)
+
+Adds a read-only PageCount device property (for printer devices
+only).
+
+Changes all Aladdin-supported drivers to clip drawing requests to the
+((0,0), (width,height)) rectangle of device space.
+
+</pre><h3><a name="V2.5.1_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - Closing a NullEncode filter always gave an ioerror.
+ - If a single-character name occurred 1 character before the
+end of an input buffer, the character would be doubled.
+ - The procedures in gs_statd.ps didn't use "bind".
+ - Setting the page size didn't work properly with devices
+with rotated coordinate systems.
+ - If an error occurred, and the error object wasn't the last
+element of its procedure, the interpreter would re-execute the error
+object after running the error handler.
+ - Memory devices didn't get resized if HWSize was changed,
+leading to out-of-bounds memory accesses.
+
+Moves revision and revisiondate from gs_init.ps to iinit.c. Adds a
+-v switch that just prints these out.
+
+Arranges things so that if Ghostscript is reading from a pipe (`-'
+switch on the command line) and encounters an error, it exits with
+status 1 rather than 0.
+
+Changes the interpreter interface so the caller explicitly passes a
+pointer for storing an error object.
+
+</pre><h3><a name="V2.5.1_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - The automatic adjustment of the scaling for variant paper
+sizes caused the image to get expanded when it should have been
+contracted, and vice versa.
+ - The curve flattener insisted that each line segment be no
+more than 2 x the flatness in length, leading to an enormous number
+of segments even when not necessary for accuracy.
+ - flattenpath and strokepath discarded a trailing moveto.
+ - strokepath treated "0-width" lines as really having a width
+of zero, rather than one pixel.
+ - Buffered devices weren't closed and reopened if the amount
+of buffer space was changed.
+ - stroke used the line cap at the beginning of each subpath
+even if the subpath was closed.
+
+Removes the requirement that the clipping rectangle fall in the
+non-negative quadrant of device space. (This was causing problems
+for Ghostview, but removing it required adding the extra clipping
+step to the drawing routines in the drivers.)
+
+</pre>
+
+<h2><a name="Version2.5"></a>Version 2.5 (8/18/92)</h2>
+
+<p>This version adds Type 1 hinting, CCITTFax encoding and decoding, and
+Microsoft Windows support, as well as the usual minor improvements
+and bug fixes.
+
+<h3><a name="V2.5_Procedures"></a>Procedures</h3><pre>
+Fixes bugs:
+ - GSIMPATH, SLZWD, and SLZWE were omitted from the VMS
+makefiles, and GSIM2OUT was not removed.
+ - landscap.ps messed up the current path.
+
+Adds new switches:
+ -dSAFER disables file writing and directory modification.
+ -dESTACKPRINT causes errors to print the execution stack with
+== instead of =.
+ -sOutputFile=&lt;string&gt; replaces -sOUTPUTFILE (which is still
+recognized) for setting the output file or pipe for the default
+(printer) device.
+ -sPAPERSIZE=&lt;sizename&gt; initializes the paper size.
+ -dBufferSpace=&lt;number&gt; sets the buffer size for the default
+(printer) device.
+
+For Unix systems, changes the directories in GS_LIB_DEFAULT from
+`pwd` to $(gsdatadir), i.e., normally $(datadir)/ghostscript, where
+datadir is normally /usr/local/lib.
+
+Adds a note in the header file to the effect that the X Windows
+driver expects to find header files in $(XINCLUDE)/X11, not in
+$(XINCLUDE).
+
+Changes -q so it defines QUIET as true instead of null (so it can be
+used in the middle of the command line as well as at the beginning).
+
+Renames the history.doc file as NEWS.
+
+</pre>
+
+<h3><a name="V2.5_Utilities"></a>Utilities</h3>
+
+<h3><a name="V2.5_Platforms"></a>Platforms</h3><pre>
+Fixes bugs:
+ - The stack size was not getting increased on the Watcom
+platform.
+
+Removes "b" from the scratch file opening modes in gp_unix.c and
+(conditionally) in gdevprn.c, to pacify the DECstation Ultrix system.
+
+Adds a makefile (bcwin.mak) and a platform file (gp_mswin.c) for
+Microsoft Windows.
+
+On MS-DOS platforms (including Windows), uses the TEMP environment
+variable to designate the directory for scratch files.
+
+Changes std.h so that the VMS C compiler uses function prototypes and
+'const'.
+
+Changes the VMS cc makefile so it doesn't use ansi2knr.
+
+</pre><h3><a name="V2.5_Fonts"></a>Fonts</h3><pre>
+Fixes bugs:
+ - findfont left an extra entry on the stack if it couldn't
+find the default font.
+
+Renames bchi, ncri, and puti as bchri, ncrri, and putri, to conform
+with the naming scheme for other fonts.
+
+Adds $(CCFLAGS) to the command line used for compiling fonts.
+
+Converts the .pfa fonts (CharterBT, IBM Courier, and Utopia) to .gsf,
+by removing eexec encryption and also removing some mysterious
+unmapped characters from Courier. This makes these fonts work with
+DISKFONTS.
+
+Changes the implementation of compiled fonts so they are read-only
+and sharable (no external references). (They are, however, not
+position-independent.)
+
+Provides a way to use compiled fonts on platforms that limit the
+number of characters in an identifier.
+
+Adds public-domain Cyrillic and Cyrillic-Italic fonts.
+
+Adds a 'userdict begin' to .loadfont, because Type 3 fonts produced
+by Fontographer expect a writable dictionary on the top of the stack.
+
+Changes definefont for Type 1 fonts to insert UnderlinePosition and
+UnderlineThickness entries in FontInfo if they are absent, because
+many word processors incorrectly assume these entries are present.
+
+</pre><h3><a name="V2.5_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - The documentation in use.doc said that the densities for
+9-pin Epson printers were 60x60 to 240x60, rather than 60x72 to
+240x72.
+ - gdevprn.c smashed one byte beyond the end of the string
+given as the OutputFile device property.
+ - The X11 driver used XVisualIDFromVisual, which is not
+defined in X11R3.
+ - The SunView driver modified the input data, which was
+declared as const.
+ - The LaserJet IIP and III drivers shifted the page 185
+pixels to the left and 0.25" down, because the initialization string
+was incorrect.
+ - The PCX driver wrote 16-bit values using the byte ordering
+of the platform, rather than always LSB first.
+ - For vertical spacing, the LaserJet and DeskJet drivers used
+a command that spaces N/300", rather than N scan lines, but gave it a
+parameter in scan lines.
+ - The VESA driver didn't allocate a full 256-byte buffer for
+reading the mode information from the BIOS, causing the stack to get
+smashed by newer VESA implementations.
+ - The VESA driver didn't use the scan line length returned by
+the BIOS, causing garbage output for some cards and some resolutions.
+ - The generic printer driver didn't free the bitmap when
+closing the device, if it fit entirely in memory.
+ - The PaintJet driver allocated its data areas on the stack
+instead of with gs_malloc.
+ - The generic printer driver didn't attempt to increase the
+buffer size if it was too small.
+ - The band list driver didn't split large bitmaps properly,
+leading to garbled characters at high resolutions.
+ - The GIF and PCX drivers used a color map that often turned
+gray colors into non-grays.
+
+Changes the default put_props procedure so that if the device is
+open, setting HWSize and/or HWResolution closes the device and
+reopens it.
+
+Adds a driver for Microsoft Windows 3.n.
+
+Updates the 'cdj' and 'dj500c' DeskJet 500C drivers with new versions.
+(This are user-contributed drivers.)
+
+Changes gdev_prn_put_props so OutputFile can be changed dynamically.
+
+Updates the DEC LN03 driver to also handle the LA50 and LA75. (This
+is a user-contributed driver with a FSF copyright.)
+
+Changes the LaserJet/DeskJet driver so that -DA4 in the makefile
+makes A4 paper the default. The driver now also sends an appropriate
+page size selection command to the printer if the printer supports it.
+
+Changes all the Aladdin-supported drivers to return appropriate error
+codes rather than -1.
+
+Adds a driver for the S3 86C911, a PC graphics accelerator used in
+the popular Diamond Stealth board. This is the first driver that
+uploads character bitmaps to a device; others will probably follow.
+
+Adds user-supplied code to the Epson driver so it will do triple
+passes on 9-pin printers for higher resolution.
+
+Adds user-supplied code for the PaintJet XL to the PaintJet driver.
+
+</pre><h3><a name="V2.5_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - zdps1.c didn't include alloc.h.
+ - On 32-bit systems, if maxlength of a dictionary was less
+than the actual allocated space, length could become larger than
+maxlength.
+ - flushfile didn't actually flush data when reading.
+ - The ASCII85Decode filter signalled EOF prematurely.
+ - The scanner interpreted .3D.glorp as the number 0.3, rather
+than as a name.
+ - Closing a file freed the stream structure, creating
+dangling references if there were other file objects pointing to the
+same stream.
+ - eexec called handleerror if an error occurred, instead of
+letting the error propagate to an enclosing stopped.
+ - gs.h made perror illegal, instead of defining it in terms
+of strerror.
+ - One-character names weren't being allocated at
+initialization, so they could be left dangling after a restore.
+ - Internal gsaves (i.e., the ones in show and setcachedevice)
+didn't also save istate, so setfont inside a BuildChar procedure
+might cause the font outside to get changed.
+ - The allocator incorrectly freed objects in the current
+chunk that were older than the current save.
+ - mark was just an object, rather than an operator, so 'bind'
+didn't bind it. (This is theoretically a problem for null, true, and
+false also, but even more unlikely to be a problem in practice.)
+ - packed_get didn't cast packed integers to int, so negative
+integer elements of packed arrays came out wrong.
+ - quit just did a gs_exit, instead of returning to the driver
+in an orderly way.
+ - Because check_type_access checked for errors in the wrong
+order, sometimes type errors were reported as access errors.
+ - eq didn't check for stack underflow.
+ - Some of the stream_procs structures weren't properly
+declared const, leading to link errors on VMS.
+
+Implements currentcolor, currentcolorspace, setcolor, and
+setcolorspace (for DeviceGray, DeviceRGB, and DeviceCMYK only).
+
+Implements the dictionary form of image and imagemask. All the pairs
+in the Decode array must be the same; Interpolate is ignored. The
+only supported color spaces are DeviceGray, DeviceRGB, and
+DeviceCMYK.
+
+Implements files as allowable sources for the image operators.
+
+Removes the index field from the name structure, moving it to the
+'size' field of name refs.
+
+Changes the unread/sungetc operation to require that the character be
+the same as the last one read from the file.
+
+Adds fflush calls to some debugging printout routines, because Unix
+sometimes buffers terminal output.
+
+Implements the CCITTFaxEncode and CCITTFaxDecode filters. Implements
+the general case of the SubFileDecode filter.
+
+Changes definefont to treat a UniqueID of 0 as equivalent to no
+UniqueID, because Fontographer output apparently often violates the
+specification in this way.
+
+Changes the default printer screen from 32.5 to 46 cells/inch. (The
+old value was appropriate for a hand-rotated cell with two spots in
+it.)
+
+Changes the utility routines to allow an integral real wherever an
+integer parameter is expected in a dictionary, because Fontographer
+produces fonts that violate the Adobe specification in this way.
+
+Adds a `dosio' feature that provides direct access to memory and to
+I/O ports under MS-DOS. (This feature is not included in the
+standard executables, of course.)
+
+Changes the default character cache limit to a 1/4" x 1/4" character
+at the default resolution, rather than basing it on the preallocated
+cache size.
+
+Removes support for t_color objects, which haven't actually been used
+for several releases.
+
+Implements setcmykcolor and currentcmykcolor as operators, so they
+will interact properly with setcolorspace and currentcolorspace.
+
+Changes the name of the file.h header file to files.h, to work around
+a bug in the VMS header library.
+
+Adds command line switches @file (to treat file as more command line,
+to get around the DOS 128-character command line limit) and -ffile
+(so one can specify file names that begin with - or @).
+
+Changes the PFBDecode filter so it takes an additional boolean that
+says whether or not to convert binary packets to hex. (Conversion to
+hex and back to binary accounted for a substantial amount of the time
+required to load .PFB fonts.)
+
+Splits off `copydevice' as a separate operator again.
+
+</pre><h3><a name="V2.5_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - In the VMS environment, string_.h used its own prototypes
+for the str... and mem... functions instead of &lt;string.h&gt;
+ - gx_alloc_char_bits declared cdsize as long, but didn't
+shorten it when passing it to shorten_cached_char.
+ - Stroking didn't suppress fattening of the lines.
+ - kshow didn't update the cached CTM information in the show
+enumerator when returning from the callout, so further characters
+could get drawn in the wrong place.
+ - When a memory device returned its initial matrix, it
+smashed the padding fields, which contained the interpreter's type
+information.
+ - setcachedevice didn't set the initial matrix in the cache
+memory device.
+ - image_set_rgb (in the image operators) didn't do a
+gx_color_from_rgb, so in principle one could sometimes get incorrect
+colors in an image.
+ - The decision about whether or not to cache a character
+bitmap incorrectly compared the character size against cmax rather
+than cdata_size.
+ - show didn't reset the in_cachedevice flag in the graphics
+state, so characters rendered by a recursive show were never cached.
+ - clip and eoclip didn't release the intermediate flattened
+clip path, causing memory to be lost.
+ - The tile_diff routine didn't handle the case of two
+identical tiles properly; this produced garbage in the band list
+file.
+ - stringwidth didn't round the character origin to an
+integral pixel; this interacted badly with hinting, causing
+improperly hinted characters to wind up in the cache.
+ - Bitmaps (including characters) were displaced, as well as
+being clipped, if they intersected the top of a clipping region.
+ - In gxclist and gdevmem1, the raster computation (although
+not the result) could overflow an int on 16-bit machines.
+
+Implements decoding (sample mapping) for image and imagemask.
+
+Implements hinting for Type 1 fonts, based on (but not copying) the
+algorithms from the X11R5 tape.
+
+Changes curve rasterizing to use sampling, rather than recursive
+subdivision, for characters. This produces noticeably better output.
+Speed penalty for non-cached characters is less than 10% at display
+resolutions, up to 50% for 300 dpi printers.
+
+Implements gs_setcmykcolor and gs_currentcmykcolor. These are
+semi-fake, since they simply convert the color to and from RGB, but
+the former does set the current color space properly.
+
+Changes clipping regions so they use the any-part-of-pixel rule
+rather than the center-of-pixel rule. This helps avoid dropouts when
+using very small regions.
+
+Implements stroke adjustment.
+
+</pre>
+
+<hr>
+
+<h2><a name="Version2.4.2"></a>Version 2.4.2 (5/8/92)</h2>
+
+<p>
+This is another quick release. It finally fixes rotated halftone
+screens, and cleans up a few minor problems from 2.4.1.
+
+<p>
+This release is being distributed only to beta testers and commercial
+licensees, since I don't want to be distracted from working on 2.5.
+
+<h3><a name="V2.4.2_Procedures"></a>Procedures</h3><pre>
+Fixes bugs:
+ - UTRACE still appeared in the VMS makefiles.
+ - The support files (*.bat, *.doc, *.gsf, *.ps, Fontmap,
+COPYING, README) weren't included in the MS-DOS tar file.
+ - The Unix install script didn't install landscap.ps.
+
+Replaces the type1imagepath operator with PostScript code (impath.ps,
+type1ops.ps) based on the new .imagepath operator.
+
+Renames LICENSE as COPYING.
+
+</pre><h3><a name="V2.4.2_Utilities"></a>Utilities</h3><pre>
+Fixes bugs:
+ - pcharstr.ps had an occurrence of Subrs rather than /Subrs,
+causing it to not print the Subrs, or to get an error if there were
+none.
+ - font2c.ps didn't get the const declarations for string
+dictionaries quite right.
+ - The missing newline at the end of gsbj.bat confused GNU
+diff.
+ - ansi2knr would go into an infinite loop if a statement
+exceeded its internal buffer size.
+ - Compiled fonts would get processed by ansi2knr, which
+messed them up.
+
+</pre><h3><a name="V2.4.2_Platforms"></a>Platforms</h3><pre>
+Fixes bugs:
+ - Ghostscript didn't supply equivalents for rename and
+gettimeofday, which some System V platforms lack.
+ - The missing newline at the end of gp_dosfb.c confused GNU
+diff.
+
+Changes the Borland makefiles so that stack checking is only enabled
+if DEBUG or TDEBUG is set.
+
+</pre><h3><a name="V2.4.2_Fonts"></a>Fonts</h3>
+
+<pre>
+Changes the names of the Utopia fonts from utrg/utb/utbi/uti to
+putr/putb/putbi/puti, for consistency with the rest of the font names.
+Changes cour/courb/courbi/couri to ncrr/ncrb/ncrbi/ncri likewise.
+
+Replaces the Charter fonts with the CharterBT fonts donated by
+Bitstream to the X11R5 distribution.
+
+Adds font aliasing capability to Fontmap. Replaces
+Courier-[Bold]Oblique and ZapfChancery-MediumItalic by aliases.
+
+Changes the FontBBox of the Hershey fonts to be an executable, rather
+than a literal, array.
+
+</pre><h3><a name="V2.4.2_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - The GIF driver omitted a `private' on the definition of
+gif_print_page.
+ - The GIF driver wrote 16-bit values using the byte ordering
+of the platform, rather than always LSB first.
+ - George Cameron's DeskJet 500C driver had an incorrect
+control sequence for skipping blank lines.
+
+Adds 'const' in many places, including the tile and bitmap arguments
+of the tile_rectangle, copy_mono, and copy_color driver routines.
+THIS IS A DRIVER INTERFACE CHANGE. (Printer drivers are not
+affected, since they don't implement these routines.)
+
+Adds a driver for the Trident TVGA.
+
+</pre><h3><a name="V2.4.2_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - alloc_free sometimes incorrectly chose to put an unaligned
+block in an old segment on a freelist.
+ - The default undercolor removal function returned its
+argument rather than returning 0.
+
+Adds NullEncode and SubFileDecode to the standard filters, since
+bdftops uses the latter.
+
+Adds RunLengthEncode and RunLengthDecode to the optional filters.
+
+Removes the type1imagepath operator. (It is still available as
+PostScript code, impath.ps.) Replaces it with a simpler outline
+tracing operator .imagepath.
+
+Adds 'const' in many places.
+
+Makes fileposition (but not setfileposition) legal for NullEncode
+filters.
+
+Changes the default transfer function for high-resolution devices
+from the identity function to the square root function.
+
+Moves array_get from zgeneric.c to iutil.c.
+
+Changes uses of fopen to add a "b" to the access mode, rather than
+relying on the _fmode global variable on MS-DOS platforms.
+
+Allows use of the -Z switch even when gsmain.c wasn't compiled with
+-DDEBUG, since other modules might have been.
+
+Reorganizes gs.c and gsmain.c so that the latter can be used in
+server environments.
+
+Replaces all uses of stdin/out/err with gs_stdin/out/err.
+
+Makes the number of permanent entries on the dictionary stack a
+parameter, to allow inserting globaldict in the future.
+
+Changes BlueShift in the Type 1 font Private dictionary to allow real
+numbers. (This differs from the Adobe specification, but at least
+one commercial font has a real number for BlueShift.)
+
+</pre><h3><a name="V2.4.2_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - The doubling check in init_ht (gxht.c) still sometimes
+thought there was enough room to double the tile when there actually
+wasn't.
+ - Rotated halftone screens didn't work.
+ - gxarith.h used #ifdef vax, rather than #if
+!arch_floats_are_IEEE, to test whether IEEE floats were being used.
+ - pathforall didn't report a trailing moveto.
+
+Replaces gs_type1imagepath with gs_imagepath.
+
+Allows sOUTPUTFILE=-, meaning output to stdout.
+
+Adds 'const' in many places.
+
+Replaces all uses of stdin/out/err with gs_stdin/out/err.
+
+</pre>
+
+<h2><a name="Version2.4.1"></a>Version 2.4.1 (4/21/92)</h2>
+
+<p>This is a quick release to fix minor problems discovered in 2.4, and
+to add a few improvements that didn't quite make it into 2.4. It
+also adds GIF and PCX file support.
+
+<h3><a name="V2.4.1_Procedures"></a>Procedures</h3><pre>
+Fixes bugs:
+ - Some makefile dependencies, and the ccgs script, caused trouble
+for parallel versions of `make'.
+ - Compiling genarch with -O with gcc on the RS/6000 produced a
+buggy executable.
+
+Fixes some minor problems in make.doc.
+
+Adds DEVICE_DEVS2..5 to handle long device lists.
+
+Removes the need to set GS_RUN_EXE when using the Watcom compiler on
+MS-DOS systems.
+
+Gets rid of gs_ccfnt.ps, merging its function into gs_fonts.ps.
+
+Gets rid of gconfig.ps; this information is now compiled in gconfig.c.
+
+</pre><h3><a name="V2.4.1_Utilities"></a>Utilities</h3><pre>
+Fixes bugs:
+ - The palette for pstoppm in 8-bit mode didn't contain all 8
+primary colors.
+ - font2c used just values_ to mean &amp;values_[0]; some compilers
+couldn't handle this.
+
+Makes font2c insert `const' in many appropriate places.
+
+</pre><h3><a name="V2.4.1_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - The SunView driver had not been updated properly for 2.4 and was
+pretty thoroughly broken.
+ - None of the printer drivers worked properly with the Watcom
+compiler, because stdprn was doing \n -&gt; \r\n substitution.
+ - If the generic printer driver couldn't allocate the requested
+size command list buffer, it gave up rather than trying to allocate a
+smaller buffer.
+ - The SuperVGA drivers (except for the VESA driver) didn't
+work with the Watcom compiler, because a couple of places in the
+drivers weren't truncating the offset of "segmented" pointers
+properly.
+ - Some of the H-P used &lt;esc&gt;*b#Y rather than &lt;esc&gt;*p+#Y for
+vertical positioning; this apparently is wrong, at least for the
+LJIIp.
+
+Removes the dependence of the X Windows driver on Xt, Xext, and Xmu. As a
+result, Ghostscript will not install a standard colormap itself, but it
+will use one if one is already installed.
+
+Adds a set of drivers for Portable Bitmap, Graymap, and Pixmap file
+formats.
+
+Adds drivers for monochrome, EGA/VGA-style, and SuperVGA-style PCX
+file formats.
+
+Adds drivers for monochrome and 256-color GIF file formats.
+
+</pre><h3><a name="V2.4.1_Fonts"></a>Fonts</h3><pre>
+Adds ZapfChancery-MediumItalic as a copy of ZapfChancery-Oblique.
+
+</pre><h3><a name="V2.4.1_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - A value with l_new set could 'escape' to save level 0 on a
+stack; if stored, it prevented the slot from being saved and restored
+properly.
+ - 16#7fffffff + 1 gave the floating point equivalent of -2^31, not
+2^31.
+ - The PFBDecode filter computed the packet length incorrectly if
+the 0x8000-bit of the length was set.
+ - 5-byte numbers in Type 1 CharStrings complained of a rangecheck
+if they exceeded 16 bits, rather than if they exceeded the integer part of
+a fixed.
+ - (, ), and \ appearing in file name arguments in the command
+line did not work properly.
+
+Adds 'const' in many places.
+
+Changes the random number generator to be the same as the one used in
+Level 2 PostScript (as reported by Ed Taft on comp.lang.postscript).
+
+Exits with code 1 rather than code 0 on an unrecoverable error detected at
+the PostScript level.
+
+Makes dictionaries expand automatically when they fill up.
+
+Adds gp_exit to complement gp_init.
+
+Changes dictionaries to always allocate a power of 2 entries on
+32-bit machines. Changes the name table to allocate indices
+scattered, so dictionary lookup doesn't have to do a multiply to
+scramble the index.
+
+Changes the handling of currentfile to do "shallow binding" so stack
+searching is almost never required.
+
+</pre><h3><a name="V2.4.1_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - arc and arcn got a numeric exception if the radius was zero.
+ - The undocumented 15 opcode in Type 1 fonts wasn't ignored.
+ - PaintType 3 wasn't allowed. (It isn't clear what it should
+mean; we treat it as equivalent to 0.)
+ - The VAX/VMS C compiler was generating incorrect code for the
+chi_bits and cmask macros in gdevmem, producing incorrect output.
+ - If the result of the slow algorithm for intersecting clipping
+paths was a rectangle, the wrong thing happened (cbox didn't get set).
+ - gx_path_is_rectangle didn't recognize open rectangles.
+ - clist_change_tile didn't check properly whether the tile
+size had changed, so changing the screen could produce invalid band
+files.
+ - The image operators did the wrong thing in the 1-for-1
+case, interleaving N bytes of data with 7*N bytes of garbage.
+ - stroke sometimes handled bevel and miter joins wrong in
+reflected coordinate systems.
+ - init_ht checked incorrectly whether there was enough room
+to Y-replicate tiles, so sometimes it did it when it shouldn't have.
+ - stroke sometimes thought lines were thin when they weren't.
+
+Adds 'const' in many places.
+
+Adds support for 2- and 4-bit-per-pixel memory devices.
+
+</pre>
+
+<h2><a name="Version2.4"></a>Version 2.4 (3/25/92)</h2>
+
+<p>This is a major release that adds SuperVGA support, support for
+Metrics,
+settable device properties, and incremental font loading. It also
+includes important performance improvements, based on rewrites of some key
+algorithms, and quite a few new Level 2 / Display PostScript facilities.
+
+<h3><a name="V2.4_Procedures"></a>Procedures</h3><pre>
+Fixes bugs:
+ - The rule for compiling gconfig.c didn't include the -I switches.
+ - .bat files were being distributed with a \n line terminator
+rather than \r\n.
+ - A CLOSE MODULE_LIST was needed after END_COMPILE: in the VMS
+command files.
+ - Unix systems couldn't handle multiple drivers with overlapping
+sets of files.
+ - -s&lt;name&gt; defined &lt;name&gt; as a null, rather than as an empty string.
+
+Adds gconfig.ps to the list of needed configuration files.
+
+Changes the way that the makefile handles nested .h files, so that it
+doesn't have to `touch' them.
+
+Adds the loadallfonts procedure to gs_fonts.ps.
+
+Changes the standard DOS configuration to include VGA, EGA, VESA, Epson,
+BubbleJet, and H-P printer drivers.
+
+Renames ghost.mak as gs.mak, and gdevs.mak as devs.mak.
+
+Adds a USE_ASM flag so that one can build a DOS version of Ghostscript
+without having an assembler.
+
+Splits off common code from the two MS-DOS makefiles into tccommon.mak.
+
+Replaces the COPYING and LICENSE files with a new LICENSE file containing
+version 2 of the GNU General Public License.
+
+Removes DEVICES and DEVICE_OBJS from the makefiles, since they are no
+longer needed.
+
+Adds a GS_DEVICE environment variable to supply a default device name if
+desired.
+
+Adds ansihead.mak and unix-ansi.mak, to parallel [g]cc-head.mak and
+unix-[g]cc.mak, for other ANSI C compilers.
+
+Changes the way that optional features are defined in the makefiles, so
+that they actually work.
+
+Adds support for the Watcom C/386 compiler.
+
+Allows # in the command line as equivalent to =, to compensate for
+brain-damaged MS-DOS shell.
+
+Adds -sOUTPUTFILE= to set the output file or pipe.
+
+Adds -dWRITESYSTEMDICT to leave systemdict writable.
+
+</pre><h3><a name="V2.4_Utilities"></a>Utilities</h3><pre>
+Fixes bugs:
+ - pcharstr.ps insisted on having Subrs be present in the font.
+ - pcharstr.ps decoded negative numbers between -108 and -1131
+incorrectly.
+ - pfbtogs.ps didn't handle packets longer than 64K correctly.
+
+Changes the bdftops utility so that it makes entries for UnderlinePosition
+and UnderlineThickness in FontInfo, and so that it always records a
+FullName (the FontName if no other is provided).
+
+Changes the name of the pfbtops utility to pfbtogs, because groff already
+includes a program called pfbtops.
+
+Adds the gslp utility for doing "line printing" of text files, similar to
+enscript + lpr.
+
+Adds a new variable DITHERPPI that enables a different dither pattern,
+claimed to be better for printers.
+
+Adds the font2c utility for compiling Type 1 fonts into C, so they can be
+linked into an executable rather than loaded dynamically.
+
+</pre><h3><a name="V2.4_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - gdev_prn_copy_scan_lines was erroneously masking the last byte
+of data even on color printers, as was paintjet_print_page.
+ - The TruFax driver had a couple of compilation errors, since it
+hadn't been compiled in a while.
+ - The BGI driver sometimes didn't consult BGIPATH when looking for
+.BGI files.
+ - initclip did the wrong thing with memory devices.
+ - The BGI driver didn't look in BGIDIR for .BGI files.
+ - The Epson driver didn't set the right margin properly with
+ESC+Q.
+ - The BJ-10e driver was badly broken.
+ - gdev_prn_open/close_printer didn't reset the command list file,
+so it was taking quadratic time to print multi-page documents.
+
+Adds color to the SunView driver.
+
+Adds selectable resolution (75, 100, 150, or 300 DPI) to the
+DeskJet/LaserJet driver.
+
+Changes gssetdev so that drivers can specify special libraries to be
+loaded, as well as object files.
+
+Adds a driver for VESA-compliant SuperVGA displays. This driver handles
+all resolutions from 640 x 400 up to 1280 x 1024, in 256-color mode. The
+default is VGA resolution (640 x 480).
+
+Adds a driver for the ATI Wonder SuperVGA card, and for SuperVGA cards
+using the Tseng Labs ET3000 or ET4000 chip such as the STB VGA EM-16 and
+the Orchid ProDesigner II (256-color modes only).
+
+Adds a driver for Trident and Tseng Labs SuperVGA cards in 800 x 600,
+16-color modes (for cards with only 256K of memory).
+
+Adds user-contributed drivers for the Ricoh 4081, DEC LN03, Canon LBP-8II,
+and H-P DeskJet 500C printers.
+
+Adds Tim Theisen's Ghostview changes to the X11 driver.
+
+MAKES NON-BACKWARD-COMPATIBLE CHANGES TO THE DRIVER PROCEDURE INTERFACE as
+follows:
+
+ - Changes map_rgb_color and map_color_rgb to always work in a
+ 16-bit color value space, rather than a space defined by the
+ maximum number of distinct colors provided by the device.
+
+ - Adds an argument to the output_page procedure to indicate
+ whether the procedure is being called for copypage or
+ showpage, and a num_copies argument.
+
+ - Adds a gx_bitmap_id to the copy_ and tile_ procedures, so that
+ drivers can cache bitmaps in the server or device if they want
+ to.
+
+ - Removes fill_trapezoid and tile_trapezoid.
+
+ - Adds a new get_bits procedure for reading the bits back from the
+ driver buffer (when possible), replacing copy_scan_lines.
+ This procedure takes a new argument describing padding and
+ byte swapping, and returns a different value from
+ copy_scan_lines.
+
+ - Adds get_props and put_props procedures for accessing arbitrary
+ additional properties of devices. The interface is quite
+ complex, but provides a great deal of flexibility.
+
+See drivers.doc for details.
+
+Changes gdev_mem_bytes_per_scan_line to gdev_prn_bytes_per_scan_line.
+
+Adds a user-contributed driver for DigiBoard, Inc.'s fax software.
+
+</pre><h3><a name="V2.4_Fonts"></a>Fonts</h3>
+
+<pre>
+Changes Type1BuildChar so it uses the information from the Metrics
+dictionary in the font, if Metrics is present.
+
+Changes findfont (.loadfont) so it recognizes .PFB fonts and can load them
+directly. Also changes .loadfont to disable packing temporarily, because
+some fonts rely on procedures being writable (!).
+
+</pre><h3><a name="V2.4_Interpreter"></a>Interpreter</h3><pre>
+Fixes bugs:
+ - The hypot function is not available on some Unix systems.
+ - Ghostscript didn't flush and close files when exiting.
+ - In statusdict, the /margins procedure used .leftmargin, but
+/setmargins used .lmargin.
+ - An out-of-range putinterval would simply do nothing, rather than
+reporting an error.
+ - If an attempt to allocate a block larger than the allocator's
+chunk size (20K) failed, the allocator would erroneously think it had
+succeeded.
+ - The bind operator made the top-level procedure read-only, as
+well as interior procedures.
+ - gs.c copied 1 extra character for the value of strings defined
+on the command line with -s...=, which could smash the first byte of the
+next object in memory.
+ - copying a dictionary erroneously required the maxlength of the
+destination to be greater than or equal to the maxlength of the source,
+rather than the length of the source.
+ - undef didn't correctly decide when to mark a deleted entry as
+deleted vs. free; as a result, some keys couldn't be looked up properly
+after an undef.
+ - type1encrypt and type1decrypt didn't set the size of the result
+properly.
+ - cvi and cvr didn't allow leading or trailing whitespace in
+strings.
+ - cvs didn't cause an error if the destination string was too
+short.
+ - Many operators didn't check correctly for stack underflow (off
+by 1).
+ - `for' used reals, rather than integers, if the limit was a real,
+even if the initial value and increment were integers.
+ - `restore' didn't properly invalidate copies of the save object
+being restored from; `save dup restore restore' would crash.
+ - `restore' sometimes didn't undo stores into matrices that were
+stored into by operators. (The identity matrix always had l_new set.)
+ - readline gave a rangecheck if the input line exactly filled the
+string.
+ - `--' as the last switch on the command line caused a crash
+rather than an error message.
+ - On MS-DOS systems, filenameforall didn't handle patterns with a
+drive or directory specifier properly.
+ - stroke sometimes called gz_draw_line_fixed even if the line went
+outside the clipping box by 1 pixel.
+
+Changes the loop that binds procedure "operators" to entirely disable the
+handling of the typecheck error, rather than to use stopped. This cuts
+initialization time significantly, and also eliminates about 35K of wasted
+space (for saving the stacks).
+
+Changes the version "operator" so it returns 47.0. Adds "revision" to
+define the Ghostscript version # x 100.
+
+Adds gscurrentresolution and gssetresolution procedures for getting and
+setting the device resolution.
+
+Adds -r&lt;res&gt; and -r&lt;xres&gt;x&lt;yres&gt; as command line options for setting
+device resolution.
+
+Adds a facility for incrementally loading the individual CharStrings of a
+Ghostscript font from the disk. This can save a lot of memory, at the
+expense of slower rendering. (It is intended primarily for MS-DOS
+systems.)
+
+Changes findlibfile to return the name of the file that was actually
+opened, as well as the file itself, when the operation succeeds.
+
+Changes the name of the main entry to the interpreter from interpret to
+gs_interpret, because of a conflict with a Data General library procedure.
+
+Adds the .setmetrics operator to set the metrics for the current
+character for Type 1 fonts.
+
+Adds more LaserWriter-specific entries to statusdict.
+
+Gives names to all the internal `operators', so they will print out
+reasonably when an error occurs.
+
+Extends the status operator to accept a string and return file
+information, as defined for Level 2 PostScript.
+
+Adds the filter operator and some specific filters: ASCII85Encode,
+ASCII85Decode, ASCIIHexEncode, ASCIIHexDecode, eexecDecode, NullEncode,
+PFBDecode, and the null case of SubFileDecode.
+
+Extends the scanner to recognize the Level 2 &lt;&lt; and &gt;&gt; tokens.
+
+Adds a facility for extracting the text strings from a PostScript file and
+writing them out in a simple format (selected by -dASCIIOUT, implemented
+by gs_2asc.ps).
+
+Implements all of the remaining Display PostScript facilities that are
+also in Level 2 (i.e., everything in section A.1.3 of the PostScript
+Language Reference Manual, Second Edition, that is not also in section
+A.1.2). The virtual memory operations are all stubs; the new halftone
+options are not fully implemented.
+
+Changes makeimagedevice to use a string of gray or RGB values, rather than
+an array of color objects, to specify the palette. Removes
+currentgscolor and setgscolor from the interpreter, but leaves t_color
+objects in, since they may be useful later.
+
+Adds getdeviceprops and putdeviceprops for manipulating device properties.
+Currently defined properties for all devices: InitialMatrix, HWResolution,
+HWSize, Name. Currently defined properties for printers: BufferSpace,
+MaxBitmap, OutputFile. OutputFile allows |command for piping on Unix
+systems.
+
+Removes deviceparams and makedevice. Adds devicedefaultmatrix.
+
+Implements reversepath.
+
+Makes copy work on devices.
+
+MS-DOS specific
+- - - - - - - -
+
+Fixes bugs:
+ - iutilasm.asm wouldn't assemble with newer versions of MASM if
+CPU_TYPE was set to 286 or above.
+ - CPU_TYPE=386 didn't properly substitute the faster
+multiply/divide routines under Turbo C++ or Borland C++, only under the
+original Turbo C.
+
+</pre><h3><a name="V2.4_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - A curve whose first and last points were the same wouldn't get
+drawn at all.
+ - A bug in the Turbo C++ compiler generated bad code when shifting
+a long right by 1 bit.
+ - If stroking a dashed line ever encountered a segment that was
+completely blank, Ghostscript would indirect through a null pointer.
+ - arc and arcn gave an error if the radius was negative.
+ - stroke always used the general algorithm, even if the line was
+guaranteed to be thin.
+ - arc and arcn erroneously reduced the angles mod 360.
+ - Very large or negative 32-bit numbers in Type 1 fonts didn't
+work properly on MS-DOS systems (the ff0000 bits got set to zero).
+ - Color printer devices rendering entirely in memory only
+allocated a monochrome-sized bitmap.
+ - clip and eoclip didn't intersect the paths properly in the
+general case.
+ - charpath erroneously rounded the current point to an integral
+value, causing characters to be spaced improperly.
+ - The definition of max_color_param got some compilers confused.
+ - charpath always used quadratic time and space, and dropped all
+but the last character when used with a Type 3 font.
+ - Stroking a path with a 180 degree angle would incorrectly miter
+instead of beveling.
+ - Type 1 fonts used the current flatness for curves, which could
+produce bad (and inconsistent) results.
+ - Stroking a degenerate line segment produced incorrect results.
+
+Changes the character cache to use the UniqueID as the key, when
+available, instead of the font pointer. This dramatically improves
+performance when fonts are getting removed and reloaded because of page
+isolation with save/restore.
+
+Removes some unnecessary casts to (float) from gsmatrix.c and gscoord.c.
+
+Changes the Type 1 interpreter so that it rounds line and curve endpoints
+to the center of the nearest half-pixel, and omits null line segments.
+This both speeds up rendering at small sizes and improves output quality.
+
+Changes gs_deviceparams to return resolution as well as extent; changes
+gs_makedevice to accept resolution as well as extent.
+
+Replaces the algorithm for approximating circular arcs with curves with a
+more accurate one.
+
+Changes gs_point and gs_rect to use doubles rather than floats.
+
+Adds gs_setmetrics, for overriding Type 1 font metrics for the current
+character.
+
+Changes clipping to use lists of rectangles rather than path intersection.
+ This makes a big difference when clipping bitmaps (including characters).
+
+Changes the character cache to discard entries incrementally, rather than
+clearing the entire cache when it fills up.
+
+Changes the implementation of transfer functions to use a cached map,
+built when the transfer function is set. This makes transfer functions
+work properly in all situations, including images.
+
+Defines a .quit operator that takes an exit code, and redefines quit in
+terms of it.
+
+Adds support for 16-bit-per-pixel devices in gdevmem.
+
+Adds gs_copydevice and gs_deviceinitialmatrix; removes gs_deviceparams and
+gs_makedevice.
+
+Changes setscreen to ensure that the cell is always at least 4x4 pixels in
+size.
+
+</pre>
+
+<h2><a name="Version2.3"></a>Version 2.3 (8/28/91)</h2>
+
+<p>This is a minor release to fix two bugs and add the PaintJet driver,
+which
+didn't make it into 2.2.
+
+<h3><a name="V2.3_Utilities"></a>Utilities</h3><pre>
+Changes the pstoppm utility so it counts pages correctly even in the
+presence of arbitrary saves and restores.
+
+</pre><h3><a name="V2.3_Drivers"></a>Drivers</h3><pre>
+Adds a new, "supported" PaintJet driver.
+
+Changes the Epson driver to use ESC+D rather than ESC+\ for horizontal
+positioning, since many printers don't support the latter.
+
+Adds horizontal double-density (two-pass) printing to the Epson driver, so
+it can do 240 x 60 and 360 x 180 densities. (Vertical double density is
+not supported yet.)
+
+</pre>
+
+<hr>
+
+<h2><a name="Version2.2"></a>Version 2.2 (6/1/91)</h2>
+
+<p>
+The purpose of this release is to add save/restore, and a few
+miscellaneous Level 2 P*stScr*pt features such as undef. It also includes
+major improvements in graphics quality and in handling of high-resolution
+printers.
+
+<h3><a name="V2.2_Procedures"></a>Procedures</h3><pre>
+Changes the version numbering to M.mpp rather than M.m.p, so that
+`version' can be a real number for those programs that insist on it.
+
+Renames ghost.ps as gs_init.ps, gfonts.ps as gs_fonts.ps, and statusd.ps
+as gs_statd.ps. The initialization files now all are named gs_*.ps.
+
+Renames gdevs.{c,h,tl} as gconfig.{c,h,tl}.
+
+Changes the relevant makefiles and command files so that a single build
+can contain several drivers that share code, e.g., the Epson driver and
+the DeskJet driver.
+
+Changes gs_init.ps so it relies on an external gconfig.ps file rather than
+making a specific test for the presence of Level 2 features.
+
+Adds an entry for uglyr.gsf to the makefile.
+
+Removes the distinction between CCA and CCNA, since most of the files now
+contain constructs that require non-ANSI compilation on MS-DOS platforms.
+
+Adds a `man' page for the ansi2knr utility.
+
+Changes the documentation (use.doc) to show how to use -sDEVICE=&lt;device&gt;,
+or the selectdevice procedure, to select devices by name.
+
+Adds DEVICE_DEVS to the makefiles (analogous to DEVICES and DEVICE_OBJS).
+This finally makes the make procedure fully automatic.
+
+Adds the name of the initialization file (gs_init.ps) as a
+platform-specific makefile parameter, GS_INIT.
+
+Removes the test program gt.{c,tr} from the fileset, since it is not
+useful to users.
+
+Moves the Symbol encoding vector to a separate file (symbol_e.ps), from
+which it is loaded when first used.
+
+Changes the error handler so it can handle errors that occur while reading
+the initialization files.
+
+Extends ansi2knr so it can handle `void' and `...' in parameter lists.
+
+Adds quit.ps to the set of installed files.
+
+MS-DOS-specific changes
+- - - - - - - - - - - -
+
+Adds the VGA and BGI drivers to the standard MS-DOS configuration, and
+makes VGA the default.
+
+Adds a `+' and a newline at the end of gs.tr, to avoid problems with file
+transfer programs or editors that add a newline at the end of files.
+
+Changes the name of msdos.mak to turboc.mak, and creates a new tbcplus.mak
+makefile for use with Turbo C++ and Borland C++.
+
+Changes the extension of the loader response files from .tl to .tr.
+
+Changes the default search path from c:/ghost and c:/ghost/fonts to c:/gs
+and c:/gs/fonts.
+
+Changes the directory separator from `|' back to ';', since it appears
+that DOS can handle a ; in a command line if it is prefixed with \.
+
+Unix-specific changes
+- - - - - - - - - - -
+
+Changes the uses of install in unixtail.mak so they only install a single
+file at a time, which is all that the standard Unix install allows.
+
+Removes the duplicate files (README/readme, LICENSE/license,
+COPYING/copying, Fontmap/fontmap).
+
+Changes the ld flags from LDPLAT to LDFLAGS.
+
+Adds XCFLAGS and XLDFLAGS. These are concatenated with CFLAGS and LDFLAGS
+respectively. The intention is that they be set from the `make' command
+line if desired.
+
+VMS-specific changes
+- - - - - - - - - -
+
+Repairs the omission of ZPACKED from the VMS build lists.
+
+</pre>
+
+<h3><a name="V2.2_Drivers"></a>Drivers</h3><pre>
+Fixes bugs:
+ - The SunView driver produced semi-garbage on little-endian
+platforms (Sun-386i) because it didn't swap the bit order.
+ - The X driver would dump core if it couldn't open the display and
+the DISPLAY environment variable wasn't set.
+ - The X driver relied on white = 0, black = ones in a couple of
+places;
+ - The X driver would return an error, instead of clipping, if
+asked to display outside the window.
+ - The X driver would create inappropriately sized windows, because
+it believed the server's report of the screen resolution.
+
+Adds Fran Taylor's Private Eye driver to gdevs.mak and the fileset (not
+supported by Aladdin Enterprises).
+
+Adds Neil Ostroff's TruFax driver to gdevs.mak and the fileset (not
+supported by Aladdin Enterprises).
+
+Makes the scratch file template for the printer drivers a per-platform
+quantity (gp_scratch_file_name_template). Puts the default scratch files
+for Unix in /usr/tmp rather than /tmp.
+
+Changes the SunView driver to prevent the Ghostscript window from being
+destroyed (which badly confuses the interpreter).
+
+Extends the Epson driver to handle a variety of print densities in both X
+and Y, to handle 24-pin as well as 8-pin graphics, and to allow optional
+specification of default density in the makefile (gdevs.mak).
+
+Refactors the printer drivers so that a single driver handles both DeskJet
+and LaserJet. Adds LaserJet drivers that use the new compression modes on
+the LJ IId/IIp and LJ III.
+
+Changes all the printer drivers to use band lists rather than bitmap
+paging as the buffering method. (The individual drivers need only a
+one-line change to replace mem_copy_scan_lines with
+gdev_prn_copy_scan_lines with a different argument.)
+
+Adds the halftone phase as additional arguments to tile_rectangle and
+tile_trapezoid.
+
+Adds an entirely new and much simpler PaintJet driver, using the new band
+list interface.
+
+Adds margin information to the device structure. This is currently only
+relevant for printer devices.
+
+Adds BGIPATH and BGIUSER environment variables, allowing additional
+control of the BGI driver.
+
+Changes the x/y_pixels_per_inch member of the device structure from int to
+float.
+
+</pre>
+
+<h3><a name="V2.2_Fonts"></a>Fonts</h3>
+
+<pre>
+Patches gs_fonts.ps so definefont will add an isFixedPitch entry to
+FontInfo if there isn't one there.
+
+Removes the old "type 7 path" encoding code from gs_fonts.ps.
+
+Changes bdftops so it puts isFixedWidth and ItalicAngle entries in the
+FontInfo dictionary of the fonts it creates, since some P*stScr*pt
+programs rely on this.
+
+Changes bdftops so it synthesizes as many missing characters as possible
+out of the ones that are there (in particular: synthesizes accents out of
+punctuation marks, and accented characters using seac.) The results
+aren't all that good, but they're a lot better than having characters
+missing out of the font.
+
+</pre><h3><a name="V2.2_Utilities"></a>Utilities</h3><pre>
+Adds a pfbtops utility for converting .PFB fonts to standard Ghostscript
+fonts.
+
+Fixes bugs:
+ - ps2image didn't reset things properly between pages for
+multi-page documents.
+
+</pre><h3><a name="V2.2_Interpreter"></a>Interpreter</h3><pre>
+Makes Ghostscript recognize `-' alone as meaning that it should read from
+standard input as though it were a file. This allows Ghostscript to
+accept a pipe as input.
+
+Fixes bugs:
+ - seac in type1addpath used the current font's encoding, not
+StandardEncoding.
+ - type1decryptfile (eexec) didn't recognize binary (as opposed to
+hex) representation.
+ - Mentioning a name whose value was a no-access object caused an
+invalidaccess error.
+ - There was a bogus definition of `run' in zfile.c.
+ - The interpreter didn't handle end-of-file on stdin properly.
+ - Real numbers with an 'e' or 'E' but no decimal point were not
+recognized.
+ - On MS-DOS systems, inside strings, \ followed by a newline was
+not discarded properly.
+ - On MS-DOS systems, the long unsigned divide routine sometimes
+gave incorrect answers. Among other things, this caused alternate-radix
+numbers sometimes to crash the interpreter.
+ - cvrs didn't do the right thing about reals or negative integers.
+ - .echo.mode was being reset with def instead of store, and was
+defined in systemdict rather than userdict.
+ - setgray and settransfer didn't interact properly.
+ - 16#80000000 was being interpreted as a signed integer (and
+converted to a real) rather than an unsigned one.
+ - atan returned 0 sometimes when it should have returned 180.
+ - currentcmykcolor was defined wrong.
+
+Removes the filename operator, since no standard Ghostscript code used it,
+and it caused problems with some P*stScr*pt files.
+
+Implements new operators: filenameforall, selectfont (as a procedure),
+stringmatch, undef.
+
+Adds new standard procedures: selectdevice.
+
+For MS-DOS, requires that the operand and execution stacks be located in
+the data segment, and uses short pointers to address them. This produces
+significantly smaller and faster code. (These changes are not visible to
+users or library clients.)
+
+Changes the assignment of attribute bits, and adds new bits for
+save/restore and the garbage collector. Changes many of the macros in
+store.h to support save/restore. (These changes are not visible to users
+or library clients.) Implements save and restore.
+
+Moves type names from gs_init.ps to ghost.h and ztype.c.
+
+Moves error names from gs_init.ps to errors.h and iinit.c.
+
+Introduces gp.h as a documented interface to the platform-specific files.
+
+Adds the -- switch, which allows Ghostscript programs to take arguments
+from the command line.
+
+Changes many uses of the name `name' to something else, to avoid upsetting
+the Microsoft C compiler.
+
+Really implements packed arrays -- they took the same amount of space as
+ordinary arrays in previous versions.
+
+Changes exitserver in serverdict so that it just clears the stacks. (This
+isn't the correct fix, but it will do as a workaround.)
+
+Makes many miscellaneous small changes to pacify various compilers.
+
+Changes gs_fonts.ps so that when "quiet" mode is selected (-q switch),
+Ghostscript doesn't print anything when loading fonts or when substituting
+for undefined characters.
+
+Defines the name consisting of just a control-D as a no-op, because some
+P*stScr*pt-generating applications put control-Ds in their output.
+
+Implements halftone phase (sethalftonephase and currenthalftonephase
+operators).
+
+Removes the -E switch, since it is no longer useful.
+
+Changes the -w and -h switches to a single -g (geometry) switch, with
+usage -g&lt;width&gt;x&lt;height&gt;. Makes the -h switch, and a new -? switch, print
+usage help.
+
+Implements correct handling of stack overflow errors (makes an array out
+of the contents of the overflowing stack, and resets the stack, before
+invoking the error handler).
+
+Adds t_oparray (`operators' defined as procedures) and the makeoperator
+operator. This is so that programs like the Distillery that rely on all
+operators being bound by `bind' will work properly.
+
+Adds a new NOPAUSE flag to suppress the prompt and pause at copypage and
+showpage.
+
+</pre><h3><a name="V2.2_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - gs_type1_interpret didn't store the encryption state or the skip
+count before returning to let the client handle a seac or an endchar in
+the middle of a seac.
+ - The definition of the Type 1 operator ce_testadd was based on
+wrong information; the operator takes only 2 operands and does something
+unknown.
+ - mem_true24_copy_mono wasn't incrementing the destination pointer
+if the color was transparent, leading to garbled characters.
+ - gx_lookup_fm_pair would sometimes look at one entry beyond the
+end of the cached font/matrix pair area. (This probably had no practical
+effect.)
+ - gs_type1_interpret didn't save the current point when returning
+to the client for a callothersubr, causing some characters to be rendered
+displaced (such as some of the chess pieces in chess.ps).
+ - gs_setgray, gs_sethsbcolor, gs_setrgbcolor, gs_setflat, and
+gs_setlinewidth gave errors for out-of-range operands rather than forcing
+them into range.
+ - Transfer functions were not actually supported.
+ - The area fill algorithm failed on certain complex paths.
+ - The current point was sometimes defined when a BuildChar
+procedure was called.
+ - Stroking a degenerate line didn't display anything for round
+caps or joins.
+ - If the ends of a curve had exactly the same X coordinate, the
+curve sometimes wouldn't be displayed.
+ - Very thin lines that went outside the clipping region would
+sometimes be displayed as dashed, or not at all.
+ - The translation in a FontMatrix was ignored.
+ - Very wide, shallow lines would color extraneous pixels when
+using bevel or miter joins.
+ - Dashed lines didn't join properly at the beginning of a closed
+path.
+ - 0-degree arcs didn't add the appropriate line (possibly
+degenerate) to the path.
+ - gs_type1_interpret didn't reset the callsubr stack when starting
+the base character of a seac, which caused confusion if the accent's
+endchar fell inside a Subr.
+ - Non-monochrome memory memory devices weren't checking the
+arguments of the drawing procedures properly.
+ - The initial clipping rectangle for memory devices was being
+computed wrong.
+ - Null devices had a semi-infinite clipping rectangle instead of
+an empty one.
+ - gs_setlinewidth was treating negative arguments as zero, instead
+of taking the absolute value.
+ - imagemask with a dithered color used a solid color rather than
+the dithered one.
+
+Tweaks the area fill and image rendering algorithms to be a little more
+liberal with paint when being used to render characters.
+
+Changes the name of the 8-bit mapped color memory device from
+mem_mapped_color_device to mem_mapped8_color_device.
+
+Changes the memory devices so that on little-endian platforms, they can
+store the bytes within a word in either order. (Little-endian order
+allows efficient 32-bit updating, big-endian is required when displaying
+or writing to a printer or a file.)
+
+Implements halftone phase.
+
+Replaces the trapezoid fill algorithm with a much more accurate one
+inspired by a contribution from Paul Haeberli. This also changes the
+graphics convention back to filling only pixels whose center falls within
+the region to be filled.
+
+Changes the character cache to allocate headers and bits contiguously out
+of a single ring buffer.
+
+Changes gs_imagemask and gs_imagemask_init to take a thickness adjustment
+parameter.
+
+Changes gs_setcachedevice and gs_setcharwidth to take the graphics state
+as a parameter.
+
+Renames gx_device_memory_bitmap_size as gdev_mem_bitmap_size,
+mem_copy_scan_lines as gdev_mem_copy_scan_lines, and
+mem_bytes_per_scan_line as gdev_mem_bytes_per_scan_line.
+
+</pre>
+
+<hr>
+
+<h2><a name="Version2.1.1"></a>Version 2.1.1 (1/15/91)</h2>
+
+<p>This is a sub-release distributed to fix a few early bugs in 2.1,
+just in
+time for the new GNU master tape.
+
+<h3><a name="V2.1.1_Build_procedures"></a>Build procedures</h3><pre>
+Removes all of the (undebugged) Level 2 code from the fileset, as well as
+the (unused) file gdevvga.c.
+
+Changes the tar file so that the files are stored in the directory
+gs&lt;version&gt; rather than simply gs, e.g., gs211.
+
+</pre><h3><a name="V2.1.1_Interpreter"></a>Interpreter</h3><pre>
+Changes the scanner so that \ is recognized within strings regardless of
+whether the scanner is reading from a string or from a file. This is
+compatible with newer P*stScr*pt interpreters, and with the newer
+P*stSc*pt language specification, but not with the older specification in
+the original PostScript Language Reference Manual.
+
+</pre><h3><a name="V2.1.1_Drivers"></a>Drivers</h3><pre>
+Fixes the max_value macro in gdevmem.c so that compilers won't complain
+about a left shift by 32.
+
+Adds 'byte' to the list of types that gdevx.c must sidestep because header
+files use them.
+
+</pre><h3><a name="V2.1.1_Library"></a>Library</h3><pre>
+Changes the computation of penum-&gt;unpack in gsimage.c so as not to upset
+compilers that don't treat procedures and pointers to procedures as
+compatible types for conditional expressions.
+
+</pre>
+<h2><a name="Version2.1"></a>Version 2.1 (12/31/90)</h2>
+
+<p>This is primarily a bug fix release to clean up problems in 2.0. It
+also implements a first cut at the new color operators.
+
+<h3><a name="V2.1_Build_procedures"></a>Build procedures</h3><pre>
+Changes the separator for multiple directories in MS-DOS from ';' to '|',
+since there is no way to include a ';' in a command line.
+
+Adds &lt;dir&gt;/fonts to the default search path, where &lt;dir&gt; is c:/ghost for
+MS-DOS systems and `pwd` for Unix systems.
+
+Adds new documentation describing how to direct output to the printer.
+
+Changes the PROCTYPE and USE8087 options in MSDOS.MAK to CPU_TYPE and
+FPU_TYPE. The latter now indicates the type of FPU to generate code for,
+if any.
+
+</pre>
+
+<h3><a name="V2.1_Drivers"></a>Drivers</h3>
+
+<pre>
+Adds a driver for the Canon BubbleJet BJ10e.
+
+Modifies the EGA driver to handle (non-standard) frame buffers larger than
+64K. Adds drivers for the VGA and for the EIZO MDB-10 (a 1024 x 768 frame
+buffer).
+
+Changes the X driver so that it clips to the window dimensions, rather
+than reporting an error.
+
+Notes that the H-P LaserJet driver, like the DeskJet driver, works under
+Unix as well as MS-DOS.
+
+Adds support for 120 X DPI mode, and for the LQ-1500, to the Epson driver.
+
+</pre><h3><a name="V2.1_Fonts"></a>Fonts</h3><pre>
+Fixes bugs in bdftops:
+ - It was using /UniqueId instead of /UniqueID as the key for the
+font unique ID. This effectively disabled the font cache.
+ - The definition for .notdef was bogus -- an invalid CharString.
+
+Changes ghost.ps and gfonts.ps so that NullFont is the initial font,
+rather than Ugly.
+
+Arranges things so that when attempting a font substitution, if the
+default font is not found, NullFont is used instead.
+
+Extends bdftops so that if certain easily synthesized characters are
+missing from a font, it will attempt to synthesize them using available
+characters.
+
+</pre><h3><a name="V2.1_Interpreter"></a>Interpreter</h3><pre>
+Extends the -T switch to allow specifying a printf template for the
+arguments of the procedure being traced.
+
+Fixes bugs:
+ - /0 was interpreted as equivalent to 0 (a number) rather than a
+literal name.
+ - packedarray was defined as being like array, instead of like
+array followed by astore.
+ - Many minor and harmless type mismatches (and a couple of very
+minor genuine bugs) were upsetting the Apollo C compiler.
+ - exp was incorrectly failing in certain cases with a negative
+first argument.
+ - copyscanlines incorrectly required at least 4 elements on the
+operand stack, although it correctly only used the top 3.
+ - readhexstring incorrectly read 1 byte even if the string length
+was zero.
+ - Not every place that expected an array would accept a packed
+array.
+ - Very complex paths (and infrequently other things) could produce
+a 'memory leak'.
+ - / alone would skip following whitespace and gather following
+characters, rather than creating an empty name.
+ - ghost.ps left newerror defined as true in $error, which resulted
+in an erroneous error report if a program executed a 'stop'.
+ - The definition of exitserver in serverdict didn't clear the
+stack.
+ - currentfile returned an executable file, rather than a literal
+one.
+ - setfont for Type 1 fonts didn't check the UniqueID in the font
+dictionary against the one in the font's Private dictionary.
+ - A value stored in a dictionary under the key /xxx couldn't be
+retrieved using the key (xxx), and vice versa.
+ - charpath with a Type 1 font on a string containing a 'space'
+would produce garbage (it released the parent path inappropriately).
+ - bytesavailable did not work properly for terminal input.
+
+Changes the interface to the memory allocator so that it always takes an
+element size and an element count, like calloc instead of malloc (but note
+that alloc does *not* clear just-allocated blocks). Gets rid of the
+special 'dynamic' allocation procedures.
+
+Changes the random number operators to use a better implementation.
+
+Changes the idiv operator so it will accept any numbers, not just
+integers, as arguments. (The PostScript manual doesn't allow this, but
+implementations apparently do.)
+
+Provides semi-fake but usable definitions for all of the color PostScript
+extensions, including a real implementation of colorimage.
+
+No longer uses the name 'null', which is apparently reserved by Microsoft
+C. Makes a number of other minor changes required to pacify the Microsoft
+C compiler.
+
+Implements %statementedit and %lineedit. (%statementedit is equivalent to
+%lineedit, which is wrong.) Changes the interactive interpreter to use
+%statementedit.
+
+Changes the scanner to accept null, ctrl-K (vertical tab), and ctrl-L
+(form feed) as whitespace. Ctrl-L terminates a comment, null and ctrl-K
+do not.
+
+Allows a literal string as the 'proc' argument(s) for image, imagemask,
+and colorimage.
+
+Adds the following operators/procedures: arct, cleardictstack, deletefile,
+renamefile.
+
+Defines =print as a synonym for =, for the benefit of LaserPrep.
+
+Implements non-zero PaintType for the show operators (but not for
+charpath) for Type 1 fonts.
+
+Adds the ISOLatin1Encoding encoding vector.
+
+Renames currentcolor and setcolor as currentgscolor and setgscolor, to
+avoid conflict with the Level 2 PostScript names. Removes colorhsb,
+colorrgb, hsbcolor, and rgbcolor.
+
+</pre><h3><a name="V2.1_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - In a couple of places, a 0 was being passed as a pointer
+argument without casting, which confused the Microsoft C compiler.
+ - Image devices were not recognized properly in debugging
+configurations.
+ - Inverted-color monochrome image devices were not recognized
+properly.
+ - Images that exactly fill the drawing area rendered very slowly,
+because they erroneously used the general clipping algorithm.
+ - Images that are 1-for-1 with the device were incorrectly scaled
+by a factor of 8 in X.
+ - Rounding artifacts sometimes caused characters to be unevenly
+offset vertically by 1 pixel.
+ - Type 1 fonts that used the Flex feature resulted in garbled
+images.
+ - The show operator routines would incorrectly fill or stroke a
+path that existed at the time the show was started.
+ - setscreen truncated the cell size instead of rounding, which
+could produce off-by-1 anomalies.
+ - stroke would sometimes produce garbage (or nothing at all) for
+very narrow lines.
+ - path filling would only color the pixels whose centers fell
+inside the path: the Adobe specification requires coloring a pixel if any
+part of it falls inside the path.
+
+Changes the Epson printer driver so that it drives the printer directly
+rather than writing to a file.
+
+Changes pathbbox so that if the path is empty but there is a current
+point, it returns a null rectangle at the current point.
+
+Changes gs_image_init to take an additional parameter (after bps) giving
+the number of samples per pixel (1, 3, or 4), and an indication of whether
+the samples for each pixel are together or separated (-3 or -4).
+
+Renames the gs_image_data and gs_imagemask_data procedures as gs_image and
+gs_imagemask, and removes the old versions of the latter.
+
+Adds gs_colorimage.
+
+Replaces Snoopy's color dithering algorithm with one contributed by Paul
+Haeberli.
+
+Changes gs_setgray, gs_[set]hsbcolor, and gs_[set]rgbcolor so that they
+coerce arguments outside the range [0..1] back into the range, instead of
+signalling an error.
+
+Makes a number of minor changes required to pacify the Microsoft C
+compiler.
+
+Changes gs_arcto so that if the last argument is a null pointer, the
+tangent points are not returned.
+
+Removes gs_type1addpath, which is not useful. (Clients must call
+gs_type1_init and gs_type1_interpret directly.)
+
+Implements the 'seac' opcode for Type 1 fonts, allowing fonts with accented
+characters to display properly.
+
+Implements the undocumented 'testadd' opcode for Type 1 fonts, which is
+used by some Adobe fonts.
+
+Renames gs_currentcolor and gs_setcolor as gs_currentgscolor and
+gs_setgscolor. Removes gs_colorhsb, gs_colorrgb, gs_hsbcolor, and
+gs_rgbcolor.
+
+</pre>
+
+<hr>
+
+<h2><a name="Version2.0"></a>Version 2.0 (9/12/90)</h2>
+
+<p>The main purpose of this release is to add fonts, support for
+multiple
+devices, and imaging into memory. It also fixes a number of miscellaneous
+bugs. (Unfortunately, accurate records of the bugs fixed are not
+available.) The changes were so extensive that we chose to increment the
+major version number.
+
+<h3><a name="V2.0_Miscellaneous"></a>Miscellaneous</h3><pre>
+Doesn't attempt to open the .MAP file on Unix systems.
+
+Adds mention of statusd.ps to interp.doc.
+
+Notes that Turbo C 2.0, not 1.5, is required for building the MS-DOS
+version.
+
+Adds a DEVICES= line to the makefile, and allows multiple devices.
+
+Documents, in interp.doc, the X Windows resources that Ghostscript
+recognizes.
+
+Adds three PostScript masters to the fileset: chess.ps (+ cheq.ps),
+golfer.ps, and escher.ps.
+
+</pre><h3><a name="V2.0_Drivers"></a>Drivers</h3><pre>
+Changes the names of all the device drivers. See gdevs.mak for the
+updated list.
+
+Adds a (working) driver for SunView.
+
+Adds drivers for the Sony NeWS frame buffer, and the Sony Microsystems
+NWP533 printers. These drivers were contributed by users, so we aren't
+prepared to answer questions about them.
+
+Adds a driver for the Borland Graphics Interface (BGI) for MS-DOS systems.
+Note that to use this driver with a non-EGA/VGA display, you need a .BGI
+file appropriate for your hardware. (The Ghostscript executable includes
+the EGA/VGA driver.)
+
+Adds a driver for Epson printers. The driver has only been tested on an
+LX-800, and on an H-P DeskJet in FX-80 emulation mode, but may work on
+other models. The driver could be adapted to work on Unix systems, but as
+distributed, it only works on MS-DOS systems.
+
+Adds a driver for the Hewlett-Packard DeskJet printer. The driver could
+be adapted to work on Unix systems, but as distributed, it only works on
+MS-DOS systems.
+
+The X Windows driver no longer waits for the user to type a character
+before bringing up the initial display.
+
+Adds information to drivers.doc describing how to change the definition of
+the device structure and procedure table.
+
+Extends the tile_rectangle and tile_trapezoid driver procedures to
+interpret color0 = color1 = gx_no_color_index as meaning that the tile is
+actually colored, not a mask.
+
+</pre><h3><a name="V2.0_Build_procedures"></a>Build procedures</h3><pre>
+Changes the tar file so it puts everything in a directory called gs.
+
+Removes the -ansi switch for gcc (this was causing problems with &lt;math.h&gt;
+on some systems).
+
+Changes LDPLAT to the string -X, which is appropriate for most Unix
+systems (but not for SunOS 4.n).
+
+Adds EXTRALIBS to the makefile, for specifying additional libraries to be
+linked in.
+
+Adds a 'clean' target for 'make', to get rid of all temporary files, the
+binaries, and the executable.
+
+Changes names of system-specific files from gp-xxx.c to gp_xxx.c.
+
+Adds support for VMS (gp_vms.c and ghost.dcl).
+
+Creates a new file gdevs.mak, and reorganizes the other makefiles, so that
+the choice of which device driver(s) to include is isolated in a single
+line in the platform-specific makefile.
+
+Changes the standard MS-DOS makefile so it builds for 8088/86 (not 80386),
+with neither -DNOPRIVATE nor -DDEBUG.
+
+Changes the name of the MS-DOS makefile from dos-ega.mak to msdos.mak, and
+the Unix makefiles from ux-[g]cc-x.mak to unix-[g]cc.mak.
+
+Updates drivers.doc to describe how to add new drivers in gdevs.mak.
+
+Removes gdevs.ps: the drivers are now responsible for specifying the size
+of the imaging region.
+
+</pre><h3><a name="V2.0_Interpreter"></a>Interpreter</h3><pre>
+Adds a makefile macro GS_LIB_DEFAULT and an environment variable GS_LIB to
+define a search path for the library (initialization and font) files, and
+implements the -I switch for the same purpose (replacing -sLIB=, which was
+never actually implemented). See interp.doc for details.
+
+No longer clears the operand stack between interactive inputs. No longer
+prints the contents of the operand stack after every input in debug mode.
+
+Doesn't "eat" the character that the user types to proceed after a
+showpage, unless it's an isolated &lt;return&gt;.
+
+Changes the prompt so that it says
+ GS&gt;
+if the operand stack is empty, or
+ GS&lt;n&gt;
+if there are n &gt; 0 elements on the operand stack.
+
+Adds -w and -h switches to the command line, equivalent to -dWIDTH= and
+-dHEIGHT= except that they require numeric arguments.
+
+Adds -q (quiet startup) switch to the command line, which suppresses some
+initial messages and also has an effect equivalent to -dQUIET.
+
+Fixes bugs:
+ - = and == caused an error on some kinds of objects if the object
+didn't have read access.
+ - cvs didn't print operator names.
+ - The definition of dynamic_begin in iscan.c caused the DEC VMS C
+compiler to produce incorrect code.
+ - mul didn't return a correct (real) result when multiplying a
+very large integer by an integer that wasn't very large.
+ - eq and ne didn't work on files, fonts, save objects, and some
+operators.
+ - The scanner would sometimes blow up on floating point numbers
+beginning with a '.'.
+ - flushfile didn't pop its argument from the stack.
+ - put and putinterval would store into a packed array.
+ - a few operators didn't check properly for stack underflow.
+ - cvrs produced wrong output for radix values greater than 10.
+ - The scanner would convert upper-case letters in alternate-radix
+numbers wrong on Unix systems.
+ - String comparisons other than equality often produced the wrong
+result if the strings were of different lengths.
+ - An ifelse as the last thing inside a forall would confuse the
+execution stack.
+ - There were some omitted casts and 'private' declarations that
+made the GNU compiler unhappy.
+ - There was a memory leak in the image[mask] operators that caused
+516 bytes to be permanently lost each time one of them was used.
+ - Quoted strings of length greater than 50 and less than 100 would
+get mangled when being read in.
+ - The scanner didn't consume the whitespace character following a
+token, so programs that read data out of the program file could get
+confused.
+ - Under rare circumstances, an object of size between 249 and 255
+bytes could get allocated on top of another object.
+
+Allows bind to bind packed arrays, even though they aren't normally
+writable.
+
+Changes the length operator to allow a name as the argument. (The
+PostScript manual doesn't allow this, but implementations apparently do.)
+
+Changes the setcachedevice operator to allow the bounding box to be
+specified as a 4-element array instead of 4 scalars. (The PostScript
+manual doesn't allow this, but implementations apparently do.)
+
+Removes a line from ghost.ps that accidentally disabled the font cache.
+
+Implements memory devices (makeimagedevice, copyscanlines, and makedevice
+for image devices). makeimagedevice is implemented only for 1, 8, 24, and
+32 bits per pixel.
+
+Changes the deviceparams operator so it pushes a mark on the stack below
+the parameters. This is to allow for devices that have more than the
+standard set of parameters.
+
+Replaces defaultdevicename with two new operators, getdevice and
+devicename.
+
+Adds a flushpage operator that flushes any outstanding buffered output to
+the screen. This is not the same as copypage: on printers, copypage
+actually prints a page, whereas flushpage may do nothing; on displays,
+flushpage and copypage may both flush output to a server.
+
+Adds an unread operator for pushing back a character into a file.
+
+Adds a description of proposed grayimage and colorimage operators to
+ghost.doc, even though they aren't implemented yet.
+
+Changes the name of the currentfileposition operator to fileposition.
+
+Removes the framedevice operator, since the new device operators supersede
+it.
+
+Adds a writeppmfile operator, for writing the contents of a memory device
+to a ppm file.
+
+Makes Ghostscript work even when the &gt;&gt; operator doesn't sign-extend
+negative numbers. (This has not been tested.)
+
+Adds the Symbol encoding to ghost.ps.
+
+Adds two new file-related operators, filename and findlibfile. See
+ghost.doc and interp.doc for details.
+
+Adds type1encrypt and type1decrypt operators for manipulating Adobe Type 1
+encoded fonts.
+
+Changes the imagecharpath and addcharpath operators to type1imagepath and
+type1addpath. These operators now work with the Adobe Type 1 font
+encoding.
+
+Adds the type1decryptfile operator for reading Adobe Type 1 encrypted
+fonts.
+
+</pre><h3><a name="V2.0_Library"></a>Library</h3><pre>
+Fixes bugs:
+ - curveto and lineto didn't check for the current point being
+defined.
+ - stringwidth would fail if there was no current point.
+ - There were omitted casts that made the GNU compiler unhappy.
+ - Line caps and joins didn't always work.
+ - Dashed lines didn't work at all.
+ - If you read out the current matrix while inside a BuildChar
+procedure, the result was garbage.
+ - image[mask] would crash if you gave it a single string with more
+than 64K-1 pixels (MS-DOS only).
+ - Filling with a gray pattern sometimes wrote into pixels beyond
+the right edge of the region (MS-DOS only).
+ - The font cache would mistake fonts for each other if both fonts
+had a default (unsupplied) "unique ID".
+ - When a character was entered into the font cache for the first
+time, sometimes it would display as garbage and/or displaced vertically
+from its proper position.
+
+Implements gs_makeimagedevice, gs_copyscanlines, gs_getdevice,
+gs_devicename, gs_flushpage, gs_writeppmfile, gs_type1encrypt,
+gs_type1decrypt, gs_type1imagepath, and gs_type1addpath procedures
+corresponding to the new operators in the interpreter (see preceding
+section).
+
+Changes [gs_]setdevice so that it does an erasepage when it first opens
+the device.
+
+Changes definition of gx_device structure as follows. NOTE: THIS AFFECTS
+ALL DRIVERS.
+
+ - Removes bits_from_MSB (which wasn't actually used, in any case).
+ Ghostscript now assumes officially, as it always did in
+ practice, that device bitmaps are stored MSB first, i.e., X=0
+ corresponds to the 0x80 bit in the first byte.
+
+ - Removes the initial_matrix member, which wasn't actually being
+ set up.
+
+ - Adds a new member 'name', a string giving the device name.
+
+ - Adds new members 'x_pixels_per_inch' and 'y_pixels_per_inch'.
+ These are only used by the default initial_matrix procedure
+ (see below).
+
+ - Adds a new procedure 'output_page'. The default implementation
+ (gx_default_output_page) just calls the sync_output procedure.
+
+ - Adds a new procedure 'get_initial_matrix'. The default
+ procedure uses the width, height, and x/y_pixels_per_inch
+ members to compute the matrix, assuming that X values run from
+ right to left, and Y values run from top to bottom.
+
+Changes the names of the allocation procedure types gs_proc_alloc and
+gs_proc_free to proc_alloc_t and proc_free_t, and moves them from gs.h to
+std.h.
+
+Makes Ghostscript work even when the &gt;&gt; operator doesn't sign-extend
+negative numbers. (This has not been tested.)
+
+</pre>
+
+<!-- [3.0 begin visible trailer] =========================================== -->
+<hr>
+
+<p>
+<small>Copyright &copy; 1996, 1997, 1998 Aladdin Enterprises.
+All rights reserved.</small>
+
+<p>
+This software is provided AS-IS with no warranty, either express or
+implied.
+
+This software is distributed under license and may not be copied,
+modified or distributed except as expressly authorized under the terms
+of the license contained in the file LICENSE in this distribution.
+
+<p>
+<small>Ghostscript version 7.07, 17 May 2003
+
+<!-- [3.0 end visible trailer] ============================================= -->
+
+</body>
+</html>