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diff --git a/Master/xemtex/doc/ghostscript/History2.htm b/Master/xemtex/doc/ghostscript/History2.htm new file mode 100644 index 00000000000..62964ee41af --- /dev/null +++ b/Master/xemtex/doc/ghostscript/History2.htm @@ -0,0 +1,5231 @@ +<!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 /<< or />> +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 <> 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 & 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 & 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 >. + - 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 <= 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 <dirent.h>. + - 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 << 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 (<ESC>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 <sys/types.h>, which is needed for +time_t on some systems. + - malloc_.h used <malloc.h> rather than <stdlib.h> 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<<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 <file> <destfile> +rather than install <file> <directory>. + +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 <page#>: replaces the former -P switch. + --last-page <page#>: replaces the former -Q switch. + --(heading|footing)-(left|center|right) <string>: define + headers/footers. # inserts the page number. + --margin-(top|bottom|left|right) <inches>: define margins. + --spacing <n>: 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 !@*&^%#@$ PCL drivers *still* didn't do the right thing +about vertical spacing: the <ESC>*p+<n>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->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&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&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 <ctype.h> 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). + - <~ ~> 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->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&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=<string> replaces -sOUTPUTFILE (which is still +recognized) for setting the output file or pipe for the default +(printer) device. + -sPAPERSIZE=<sizename> initializes the paper size. + -dBufferSpace=<number> 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 <string.h> + - 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 &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 -> \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 <esc>*b#Y rather than <esc>*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<name> defined <name> 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<res> and -r<xres>x<yres> 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 << and >> 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=<device>, +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<width>x<height>. 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<version> 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->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 <dir>/fonts to the default search path, where <dir> 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 <math.h> +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 <return>. + +Changes the prompt so that it says + GS> +if the operand stack is empty, or + GS<n> +if there are n > 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 >> 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 >> operator doesn't sign-extend +negative numbers. (This has not been tested.) + +</pre> + +<!-- [3.0 begin visible trailer] =========================================== --> +<hr> + +<p> +<small>Copyright © 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> |