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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>