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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<title>History of Ghostscript versions 1.n</title>
5 
<!-- $Id: History2.htm,v 1.39 2005/10/20 19:46:23 ray Exp $ -->
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<!-- Originally: history2.txt -->
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<!--
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	WARNING: do not use Pete Kaiser's emacs function "gs-toc" alone to
9 
	re-create the table of contents here, because it will replace the
10 
	hand-edited TOC subheads with a separate subhead for each H2 in
11 
	the body of the file.  Or if you do, first look at the original
12 
	TOC to see how to edit it for visual conciseness.
13 
-->
14 
<link rel="stylesheet" type="text/css" href="gs.css" title="Ghostscript Style">
15 
</head>
16 
 
17 
<body>
18 
<!-- [1.0 begin visible header] ============================================ -->
19 
 
20 
<!-- [1.1 begin headline] ================================================== -->
21 
 
22 
<h1>History of Ghostscript versions 2.n</h1>
23 
 
24 
<!-- [1.1 end headline] ==================================================== -->
25 
 
26 
<!-- [1.2 begin table of contents] ========================================= -->
27 
 
28 
<h2>Table of contents</h2>
29 
 
30 
<blockquote><ul>
31 
<li><a href="#Version2.9.10b">Version 2.9.10-beta (7/28/94)</a>
32 
<ul>
33 
<li><a href="#V2.9.10b_Documentation">Documentation</a>,
34 
    <a href="#V2.9.10b_Procedures">Procedures</a>,
35 
    <a href="#V2.9.10b_Utilities">Utilities</a>,
36 
    <a href="#V2.9.10b_Drivers">Drivers</a>,
37 
    <a href="#V2.9.10b_Platforms">Platforms</a>,
38 
    <a href="#V2.9.10b_Fonts">Fonts</a>,
39 
    <a href="#V2.9.10b_Interpreter">Interpreter</a>,
40 
    <a href="#V2.9.10b_Streams">Streams</a>,
41 
    <a href="#V2.9.10b_Library">Library</a>
42 
</ul>
43 
<li><a href="#Version2.9.9b">Version 2.9.9-beta (6/23/94)</a>
44 
<ul>
45 
<li><a href="#V2.9.9b_Documentation">Documentation</a>,
46 
    <a href="#V2.9.9b_Platforms">Platforms</a>,
47 
    <a href="#V2.9.9b_Fonts">Fonts</a>,
48 
    <a href="#V2.9.9b_Interpreter">Interpreter</a>,
49 
    <a href="#V2.9.9b_Library">Library</a>
50 
</ul>
51 
<li><a href="#Version2.9.8">Version 2.9.8 (6/20/94)</a>
52 
<ul>
53 
<li><a href="#V2.9.8_Documentation">Documentation</a>,
54 
    <a href="#V2.9.8_Procedures">Procedures</a>,
55 
    <a href="#V2.9.8_Utilities">Utilities</a>,
56 
    <a href="#V2.9.8_Drivers">Drivers</a>,
57 
    <a href="#V2.9.8_Platforms">Platforms</a>,
58 
    <a href="#V2.9.8_Fonts">Fonts</a>,
59 
    <a href="#V2.9.8_Interpreter">Interpreter</a>,
60 
    <a href="#V2.9.8_Library">Library</a>
61 
</ul>
62 
<li><a href="#Version2.9.7b">Version 2.9.7-beta (6/5/94)</a>
63 
<ul>
64 
<li><a href="#V2.9.7b_Documentation">Documentation</a>,
65 
    <a href="#V2.9.7b_Procedures">Procedures</a>,
66 
    <a href="#V2.9.7b_Utilities">Utilities</a>,
67 
    <a href="#V2.9.7b_Drivers">Drivers</a>,
68 
    <a href="#V2.9.7b_Platforms">Platforms</a>,
69 
    <a href="#V2.9.7b_Fonts">Fonts</a>,
70 
    <a href="#V2.9.7b_Interpreter">Interpreter</a>,
71 
    <a href="#V2.9.7b_Library">Library</a>
72 
</ul>
73 
<li><a href="#Version2.9.6b">Version 2.9.6-beta (5/23/94, not distributed to the public)</a>
74 
<ul>
75 
<li><a href="#V2.9.6b_Documentation">Documentation</a>,
76 
    <a href="#V2.9.6b_Procedures">Procedures</a>,
77 
    <a href="#V2.9.6b_Utilities">Utilities</a>,
78 
    <a href="#V2.9.6b_Drivers">Drivers</a>,
79 
    <a href="#V2.9.6b_Platforms">Platforms</a>,
80 
    <a href="#V2.9.6b_Fonts">Fonts</a>,
81 
    <a href="#V2.9.6b_Interpreter">Interpreter</a>,
82 
    <a href="#V2.9.6b_Library">Library</a>
83 
</ul>
84 
<li><a href="#Version2.9.5b">Version 2.9.5-beta (4/11/94)</a>
85 
<ul>
86 
<li><a href="#V2.9.5b_Documentation">Documentation</a>,
87 
    <a href="#V2.9.5b_Procedures">Procedures</a>,
88 
    <a href="#V2.9.5b_Utilities">Utilities</a>,
89 
    <a href="#V2.9.5b_Drivers">Drivers</a>,
90 
    <a href="#V2.9.5b_Platforms">Platforms</a>,
91 
    <a href="#V2.9.5b_Interpreter">Interpreter</a>,
92 
    <a href="#V2.9.5b_Library">Library</a>
93 
</ul>
94 
<li><a href="#Version2.9.4b">Version 2.9.4-beta (2/19/94)</a>
95 
<ul>
96 
<li><a href="#V2.9.4b_Procedures">Procedures</a>,
97 
    <a href="#V2.9.4b_Utilities">Utilities</a>,
98 
    <a href="#V2.9.4b_Drivers">Drivers</a>,
99 
    <a href="#V2.9.4b_Platforms">Platforms</a>,
100 
    <a href="#V2.9.4b_Interpreter">Interpreter</a>,
101 
    <a href="#V2.9.4b_Library">Library</a>
102 
</ul>
103 
<li><a href="#Version2.9.3b">Version 2.9.3-beta (1/19/94)</a>
104 
<ul>
105 
<li><a href="#V2.9.3b_Documentation">Documentation</a>,
106 
    <a href="#V2.9.3b_Procedures">Procedures</a>,
107 
    <a href="#V2.9.3b_Drivers">Drivers</a>,
108 
    <a href="#V2.9.3b_Platforms">Platforms</a>,
109 
    <a href="#V2.9.3b_Interpreter">Interpreter</a>,
110 
    <a href="#V2.9.3b_Library">Library</a>
111 
</ul>
112 
<li><a href="#Version2.9.2b">Version 2.9.2-beta (1/2/94)</a>
113 
<ul>
114 
<li><a href="#V2.9.2b_Documentation">Documentation</a>,
115 
    <a href="#V2.9.2b_Utilities">Utilities</a>,
116 
    <a href="#V2.9.2b_Drivers">Drivers</a>,
117 
    <a href="#V2.9.2b_Platforms">Platforms</a>,
118 
    <a href="#V2.9.2b_Fonts">Fonts</a>,
119 
    <a href="#V2.9.2b_Interpreter">Interpreter</a>,
120 
    <a href="#V2.9.2b_Library">Library</a>
121 
</ul>
122 
<li><a href="#Version2.9.1b">Version 2.9.1-beta (12/7/93)</a>
123 
<ul>
124 
<li><a href="#V2.9.1b_Utilities">Utilities</a>,
125 
    <a href="#V2.9.1b_Interpreter">Interpreter</a>,
126 
    <a href="#V2.9.1b_Library">Library</a>
127 
</ul>
128 
<li><a href="#Version2.9b">Version 2.9-beta (12/6/93)</a>
129 
<ul>
130 
<li><a href="#V2.9b_Documentation">Documentation</a>,
131 
    <a href="#V2.9b_Procedures">Procedures</a>,
132 
    <a href="#V2.9b_Utilities">Utilities</a>,
133 
    <a href="#V2.9b_Drivers">Drivers</a>,
134 
    <a href="#V2.9b_Platforms">Platforms</a>,
135 
    <a href="#V2.9b_Interpreter">Interpreter</a>,
136 
    <a href="#V2.9b_Library">Library</a>
137 
</ul>
138 
<li><a href="#Version2.8b">Version 2.8-beta (11/10/93)</a>
139 
<ul>
140 
<li><a href="#V2.8b_Documentation">Documentation</a>,
141 
    <a href="#V2.8b_Procedures">Procedures</a>,
142 
    <a href="#V2.8b_Utilities">Utilities</a>,
143 
    <a href="#V2.8b_Drivers">Drivers</a>,
144 
    <a href="#V2.8b_Platforms">Platforms</a>,
145 
    <a href="#V2.8b_Fonts">Fonts</a>,
146 
    <a href="#V2.8b_Interpreter">Interpreter</a>,
147 
    <a href="#V2.8b_Library">Library</a>
148 
</ul>
149 
<li><a href="#Version2.7.2b">Version 2.7.2-beta (10/11/93)</a>
150 
<ul>
151 
<li><a href="#V2.7.2b_Utilities">Utilities</a>,
152 
    <a href="#V2.7.2b_Interpreter">Interpreter</a>,
153 
    <a href="#V2.7.2b_Library">Library</a>
154 
</ul>
155 
<li><a href="#Version2.7.1b">Version 2.7.1-beta (10/4/93, not distributed to the public)</a>
156 
<ul>
157 
<li><a href="#V2.7.1b_Documentation">Documentation</a>,
158 
    <a href="#V2.7.1b_Utilities">Utilities</a>,
159 
    <a href="#V2.7.1b_Drivers">Drivers</a>,
160 
    <a href="#V2.7.1b_Platforms">Platforms</a>,
161 
    <a href="#V2.7.1b_Fonts">Fonts</a>,
162 
    <a href="#V2.7.1b_Interpreter">Interpreter</a>,
163 
    <a href="#V2.7.1b_Library">Library</a>
164 
</ul>
165 
<li><a href="#Version2.7b">Version 2.7-beta (9/20/93, not distributed to the public)</a>
166 
<ul>
167 
<li><a href="#V2.7b_Documentation">Documentation</a>,
168 
    <a href="#V2.7b_Procedures">Procedures</a>,
169 
    <a href="#V2.7b_Utilities">Utilities</a>,
170 
    <a href="#V2.7b_Drivers">Drivers</a>,
171 
    <a href="#V2.7b_Platforms">Platforms</a>,
172 
    <a href="#V2.7b_Fonts">Fonts</a>,
173 
    <a href="#V2.7b_Interpreter">Interpreter</a>,
174 
    <a href="#V2.7b_Library">Library</a>
175 
</ul>
176 
<li><a href="#Version2.6.1">Version 2.6.1 (5/28/93)</a>
177 
<ul>
178 
<li><a href="#V2.6.1_Documentation">Documentation</a>,
179 
    <a href="#V2.6.1_Procedures">Procedures</a>,
180 
    <a href="#V2.6.1_Utilities">Utilities</a>,
181 
    <a href="#V2.6.1_Drivers">Drivers</a>,
182 
    <a href="#V2.6.1_Platforms">Platforms</a>,
183 
    <a href="#V2.6.1_Fonts">Fonts</a>,
184 
    <a href="#V2.6.1_Interpreter">Interpreter</a>,
185 
    <a href="#V2.6.1_Library">Library</a>
186 
</ul>
187 
<li><a href="#Version2.6">Version 2.6 (5/9/93)</a>
188 
<ul>
189 
<li><a href="#V2.6_Documentation">Documentation</a>,
190 
    <a href="#V2.6_Procedures">Procedures</a>,
191 
    <a href="#V2.6_Utilities">Utilities</a>,
192 
    <a href="#V2.6_Platforms">Platforms</a>,
193 
    <a href="#V2.6_Fonts">Fonts</a>,
194 
    <a href="#V2.6_Drivers">Drivers</a>,
195 
    <a href="#V2.6_Interpreter">Interpreter</a>,
196 
    <a href="#V2.6_Library">Library</a>
197 
</ul>
198 
<li><a href="#Version2.5.2">Version 2.5.2 (9/20/92)</a>
199 
<ul>
200 
<li><a href="#V2.5.2_Procedures">Procedures</a>,
201 
    <a href="#V2.5.2_Utilities">Utilities</a>,
202 
    <a href="#V2.5.2_Platforms">Platforms</a>,
203 
    <a href="#V2.5.2_Drivers">Drivers</a>,
204 
    <a href="#V2.5.2_Interpreter">Interpreter</a>,
205 
    <a href="#V2.5.2_Library">Library</a>
206 
</ul>
207 
<li><a href="#Version2.5.1">Version 2.5.1 (9/11/92)</a>
208 
<ul>
209 
<li><a href="#V2.5.1_Procedures">Procedures</a>,
210 
    <a href="#V2.5.1_Utilities">Utilities</a>,
211 
    <a href="#V2.5.1_Platforms">Platforms</a>,
212 
    <a href="#V2.5.1_Fonts">Fonts</a>,
213 
    <a href="#V2.5.1_Drivers">Drivers</a>,
214 
    <a href="#V2.5.1_Interpreter">Interpreter</a>,
215 
    <a href="#V2.5.1_Library">Library</a>
216 
</ul>
217 
<li><a href="#Version2.5">Version 2.5 (8/18/92)</a>
218 
<ul>
219 
<li><a href="#V2.5_Procedures">Procedures</a>,
220 
    <a href="#V2.5_Utilities">Utilities</a>,
221 
    <a href="#V2.5_Platforms">Platforms</a>,
222 
    <a href="#V2.5_Fonts">Fonts</a>,
223 
    <a href="#V2.5_Drivers">Drivers</a>,
224 
    <a href="#V2.5_Interpreter">Interpreter</a>,
225 
    <a href="#V2.5_Library">Library</a>
226 
</ul>
227 
<li><a href="#Version2.4.2">Version 2.4.2 (5/8/92)</a>
228 
<ul>
229 
<li><a href="#V2.4.2_Procedures">Procedures</a>,
230 
    <a href="#V2.4.2_Utilities">Utilities</a>,
231 
    <a href="#V2.4.2_Platforms">Platforms</a>,
232 
    <a href="#V2.4.2_Fonts">Fonts</a>,
233 
    <a href="#V2.4.2_Drivers">Drivers</a>,
234 
    <a href="#V2.4.2_Interpreter">Interpreter</a>,
235 
    <a href="#V2.4.2_Library">Library</a>
236 
</ul>
237 
<li><a href="#Version2.4.1">Version 2.4.1 (4/21/92)</a>
238 
<ul>
239 
<li><a href="#V2.4.1_Procedures">Procedures</a>,
240 
    <a href="#V2.4.1_Utilities">Utilities</a>,
241 
    <a href="#V2.4.1_Drivers">Drivers</a>,
242 
    <a href="#V2.4.1_Fonts">Fonts</a>,
243 
    <a href="#V2.4.1_Interpreter">Interpreter</a>,
244 
    <a href="#V2.4.1_Library">Library</a>
245 
</ul>
246 
<li><a href="#Version2.4">Version 2.4 (3/25/92)</a>
247 
<ul>
248 
<li><a href="#V2.4_Procedures">Procedures</a>,
249 
    <a href="#V2.4_Utilities">Utilities</a>,
250 
    <a href="#V2.4_Drivers">Drivers</a>,
251 
    <a href="#V2.4_Fonts">Fonts</a>,
252 
    <a href="#V2.4_Interpreter">Interpreter</a>,
253 
    <a href="#V2.4_Library">Library</a>
254 
</ul>
255 
<li><a href="#Version2.3">Version 2.3 (8/28/91)</a>
256 
<ul>
257 
<li><a href="#V2.3_Utilities">Utilities</a>,
258 
    <a href="#V2.3_Drivers">Drivers</a>
259 
</ul>
260 
<li><a href="#Version2.2">Version 2.2 (6/1/91)</a>
261 
<ul>
262 
<li><a href="#V2.2_Procedures">Procedures</a>,
263 
    <a href="#V2.2_Drivers">Drivers</a>,
264 
    <a href="#V2.2_Fonts">Fonts</a>,
265 
    <a href="#V2.2_Utilities">Utilities</a>,
266 
    <a href="#V2.2_Interpreter">Interpreter</a>,
267 
    <a href="#V2.2_Library">Library</a>
268 
</ul>
269 
<li><a href="#Version2.1.1">Version 2.1.1 (1/15/91)</a>
270 
<ul>
271 
<li><a href="#V2.1.1_Build_procedures">Build procedures</a>,
272 
    <a href="#V2.1.1_Interpreter">Interpreter</a>,
273 
    <a href="#V2.1.1_Drivers">Drivers</a>,
274 
    <a href="#V2.1.1_Library">Library</a>
275 
</ul>
276 
<li><a href="#Version2.1">Version 2.1 (12/31/90)</a>
277 
<ul>
278 
<li><a href="#V2.1_Build_procedures">Build procedures</a>,
279 
    <a href="#V2.1_Drivers">Drivers</a>,
280 
    <a href="#V2.1_Fonts">Fonts</a>,
281 
    <a href="#V2.1_Interpreter">Interpreter</a>,
282 
    <a href="#V2.1_Library">Library</a>
283 
</ul>
284 
<li><a href="#Version2.0">Version 2.0 (9/12/90)</a>
285 
<ul>
286 
<li><a href="#V2.0_Miscellaneous">Miscellaneous</a>,
287 
    <a href="#V2.0_Drivers">Drivers</a>,
288 
    <a href="#V2.0_Build_procedures">Build procedures</a>,
289 
    <a href="#V2.0_Interpreter">Interpreter</a>,
290 
    <a href="#V2.0_Library">Library</a>
291 
</ul>
292 
</ul></blockquote>
293 
 
294 
<!-- [1.2 end table of contents] =========================================== -->
295 
 
296 
<!-- [1.3 begin hint] ====================================================== -->
297 
 
298 
<p>
299 
This document is a history of Ghostscript releases numbered 2.n.  For more
300 
recent changes, see the the other history documents and, for the latest
301 
versions, the new:
302 
 
303 
<blockquote>
304 
<a href="News.htm">News</a><br>
305 
<a href="History4.htm">History of Ghostscript versions 4.n</a><br>
306 
<a href="History3.htm">History of Ghostscript versions 3.n</a><br>
307 
History of Ghostscript versions 2.n (this document)<br>
308 
<a href="History1.htm">History of Ghostscript versions 1.n</a>
309 
</blockquote>
310 
 
311 
<p>For other information, see the <a href="Readme.htm">Ghostscript
312 
overview</a>.
313 
 
314 
<!-- [1.3 end hint] ======================================================== -->
315 
 
316 
<hr>
317 
 
318 
<!-- [1.0 end visible header] ============================================== -->
319 
 
320 
<h2><a name="Version2.9.10b"></a>Version 2.9.10-beta (7/28/94)</h2>
321 
 
322 
<p>
323 
This is the last 2.9 beta, since 3.0 will be released on July 31.
324 
 
325 
<h3><a name="V2.9.10b_Documentation"></a>Documentation</h3><pre>
326 
Fixes bugs:
327 
	- A | in gs.1 had a \ in front of it instead of \\.
328 
 
329 
Adds a paragraph in gs.1 that tells how to select paper size.
330 
 
331 
Notes in devs.mak that the cdj550 driver is the best one for the H-P
332 
DeskJet 520, and the pjxl300 driver is the right one for the H-P DeskJet
333 
1200C.
334 
 
335 
Notes in make.doc that Watcom C++ 10.0 may require a change in a makefile.
336 
 
337 
</pre><h3><a name="V2.9.10b_Procedures"></a>Procedures</h3><pre>
338 
Removes ICCINIT from MODULES.LIS for VMS systems.
339 
 
340 
Updates VMS.MAK to support Motif V1.2.
341 
 
342 
Updates jpeg.mak to work with version 5alpha4 of the IJG JPEG code.
343 
 
344 
</pre><h3><a name="V2.9.10b_Utilities"></a>Utilities</h3><pre>
345 
Fixes bugs:
346 
	- font2c didn't leave extra room in Type 0 font dictionaries for
347 
entries added by definefont.
348 
	- font2c left extra information on the stack.
349 
	- ansi2knr would remove newline characters within formal argument
350 
lists.
351 
	- font2c got an Error: /undefined in makefontprocname.
352 
 
353 
Updates ansi2knr to work better with the GNU configure program.
354 
 
355 
Updates ansi2knr to handle procedure formal arguments automatically.
356 
 
357 
</pre><h3><a name="V2.9.10b_Drivers"></a>Drivers</h3><pre>
358 
Fixes bugs:
359 
	- If a file contained color or gray-scale information followed by a
360 
masked image, the X driver would sometimes invert the polarity of the
361 
image.
362 
 
363 
</pre><h3><a name="V2.9.10b_Platforms"></a>Platforms</h3><pre>
364 
Fixes bugs:
365 
	- Unix systems with a 2-argument gettimeofday returned garbage
366 
values for the current time.
367 
	- The VMS build script for compiled fonts omitted the requirement
368 
to load gs_ccfnt.ps.
369 
	- memory_.h didn't note that System V Unix platforms need memmove.
370 
 
371 
On Unix systems, changes the subdirectory of $datadir/ghostscript to just
372 
be the version number (e.g., 2.9.10 rather than gs-2.9.9).
373 
 
374 
</pre><h3><a name="V2.9.10b_Fonts"></a>Fonts</h3><pre>
375 
Adds support code for the Wadalab (University of Tokyo) free Kanji font.
376 
 
377 
Notes in the documentation in Fontmap that .pfa and .pfb fonts are
378 
compatible with ATM, but .gsf fonts are not.
379 
 
380 
Changes the names of Thomas Wolff's expanded Hershey fonts, replacing .gsf
381 
with .pfa.
382 
 
383 
</pre><h3><a name="V2.9.10b_Interpreter"></a>Interpreter</h3><pre>
384 
Fixes bugs:
385 
	- The scanner became confused if the literal names /&lt;&lt; or /&gt;&gt;
386 
straddled an input buffer boundary.
387 
	- .setlanguagelevel gave an invalidaccess error when
388 
switching from level 2 to level 1.
389 
	- currentgstate, setgstate, and copy for gstates didn't do
390 
the necessary access checks.
391 
	- The Category resource category didn't define .ResourceFile, so
392 
/Category resourcestatus gave an error.
393 
	- The garbage collector didn't trace the structures used by
394 
filenameforall properly on most platforms.
395 
	- Automatically expanding systemdict didn't work, but didn't give
396 
an error.
397 
	- Automatically expanding a dictionary usually expanded it by too
398 
much.
399 
	- systemdict was created too small.
400 
	- The garbage collector didn't trace the structures referenced only
401 
from allocator objects, leading to attempts to access freed storage.
402 
	- If a chunk was empty, the GC tried to free it even if it had
403 
inner chunks.
404 
*	- The outer loop in dict_find_name_by_index() could cause an
405 
addressing fault on segmented machines when looking up Level 2 operators,
406 
because the offset could get decremented past 0.
407 
	- The heap_available procedure in gsmemory.c didn't convert
408 
properly to non-ANSI syntax.  (New bug in 2.9.9.)
409 
	- The ledgertray procedure wasn't implemented.
410 
	- The xxxtray procedures didn't set the page size.
411 
	- The settumble operator wasn't implemented, even as a dummy.
412 
	- glyphshow didn't work with Type 3 fonts.
413 
	- Supplying a RenderTable for a CIE color space caused an error.
414 
	- The DCT filter code had the jpeg/ subdirectory name "wired in" to
415 
the source files.
416 
 
417 
Adds experimental filters for Burrows/Wheeler block sorting compression
418 
(BWBlockSortEncode/Decode), described in DEC SRC Research Report #124,
419 
move-to-front coding (MoveToFrontEncode/Decode), and a simple form of
420 
Huffman coding (BoundedHuffmanEncode/Decode).  These are experimental -- do
421 
not rely on them remaining the same (or existing at all) in future
422 
releases!
423 
 
424 
Adds all function prototypes needed to pacify strict compilers.
425 
 
426 
Removes all explicit references to userdict from the C code.
427 
 
428 
Changes the SAFER switch so that it disallows not only explicit writing,
429 
deleting, or renaming of files, but also disallows specifying an explicit
430 
OutputFile for any device (except for the initial device, by means of
431 
-sOutputFile= on the command line).
432 
 
433 
</pre><h3><a name="V2.9.10b_Streams"></a>Streams</h3><pre>
434 
Fixes bugs:
435 
	- Hex decoding (ASCIIHexDecode stream and &lt;&gt; literals) didn't treat
436 
the data source as read-only (although it restored it to its original
437 
contents).
438 
 
439 
Implements move-to-front coding, a simple form of Huffman coding, and
440 
Burrows/Wheeler block sorting compression.
441 
 
442 
</pre><h3><a name="V2.9.10b_Library"></a>Library</h3><pre>
443 
Fixes bugs:
444 
*	- (The following bug fix was actually implemented somewhere around
445 
version 2.7.)  restore didn't purge character cache entries whose keys were
446 
names created more recently than the save.
447 
	- gstype1.h declared gs_type1_state_sizeof as an extern, but this
448 
wasn't defined anywhere.
449 
	- gs_makeimagedevice didn't set the size of the palette correctly,
450 
which confused the GC.
451 
	- gs_makeimagedevice didn't set num_components to 1 for
452 
mapped-color devices with only gray values.
453 
*	- The two-color halftoning algorithms truncated when computing the
454 
halftone level, rather than rounding it.
455 
*	- If a path being filled had line segments that fell entirely to
456 
the right of the clipping region, part of the path might not be filled.
457 
	- The optimized code for 24-bit color didn't ensure properly that
458 
32-bit accesses would be aligned appropriately.
459 
	- The miter join check had gotten reversed somewhere along the way.
460 
*	- Because x and y were interchanged in the miter check computation,
461 
in some situations the check was inverted.  (This is a very old bug!)
462 
	- It was believed that strokepath didn't work with dashed lines;
463 
the problem appears to have been an incorrect testing program.
464 
 
465 
Adds all function prototypes needed to pacify strict compilers.
466 
 
467 
Changes fixed2float so it doesn't cast the result to float, and removes
468 
fixed2double.  This produces slightly more accurate results in many places,
469 
and may even be faster (for FPUs that normally generate double rather than
470 
single precision results).
471 
 
472 
</pre>
473 
 
474 
<h2><a name="Version2.9.9b"></a>Version 2.9.9-beta (6/23/94)</h2>
475 
 
476 
<h3><a name="V2.9.9b_Documentation"></a>Documentation</h3><pre>
477 
Puts a pointer to devs.mak in the section of use.doc that talks about
478 
MS-DOS displays.
479 
 
480 
</pre><h3><a name="V2.9.9b_Platforms"></a>Platforms</h3><pre>
481 
Fixes bugs:
482 
	- The %pipe% IODevice was omitted on System V platforms.
483 
	- The AXP VMS build script needed /NESTED_INCLUDE=PRIMARY in
484 
CC_QUAL to work around a bug in the DEC C compiler.
485 
 
486 
</pre><h3><a name="V2.9.9b_Fonts"></a>Fonts</h3><pre>
487 
Fixes bugs:
488 
	- gs_lev2.ps redefined .loadFontmap incorrectly.
489 
 
490 
</pre><h3><a name="V2.9.9b_Interpreter"></a>Interpreter</h3><pre>
491 
Fixes bugs:
492 
	- stream_compact used memcpy even though the source and destination
493 
might overlap.
494 
	- filter applied to a closed file could cause a crash.
495 
 
496 
</pre><h3><a name="V2.9.9b_Library"></a>Library</h3><pre>
497 
Fixes bugs:
498 
	- putdeviceparams to a printer didn't close and reopen the device
499 
if only the page size or resolution was changed.
500 
 
501 
</pre>
502 
 
503 
<h2><a name="Version2.9.8"></a>Version 2.9.8 (6/20/94)</h2>
504 
 
505 
<p>
506 
This is the first version that claims to be a full Level 2
507 
implementation.
508 
It was distributed to satisfy a contractual requirement.
509 
</p>
510 
 
511 
<h3><a name="V2.9.8_Documentation"></a>Documentation</h3><pre>
512 
In make.doc:
513 
	- Adds a reference to the generic System V section at the end of
514 
the SCO section.
515 
	- Notes that DEC OSF/1 systems may require changing the name of the
516 
install program to installbsd.
517 
 
518 
Updates drivers.doc to reflect the change from "properties" to
519 
"parameters".
520 
 
521 
Updates the Aladdin Enterprises Free Public License to version 1.
522 
 
523 
In language.doc, notes that certain device parameters will be phased out.
524 
 
525 
</pre><h3><a name="V2.9.8_Procedures"></a>Procedures</h3><pre>
526 
Fixes bugs:
527 
	- The file aa.ps was included in the distribution by mistake.
528 
 
529 
Notes in the Unix makefiles that X11R6 probably needs SM and ICE added to
530 
XLIBS.
531 
 
532 
</pre><h3><a name="V2.9.8_Utilities"></a>Utilities</h3><pre>
533 
Fixes bugs:
534 
	- viewjpeg.ps used a non-existent file as its example.
535 
	- A temporary string in wrfont.ps was allocated too small.
536 
 
537 
Upgrades font2c.ps so it will handle (simple) Type 0 fonts as well as Type
538 
1.
539 
 
540 
</pre><h3><a name="V2.9.8_Drivers"></a>Drivers</h3><pre>
541 
Fixes bugs:
542 
	- The TIFF drivers didn't byte-align each scan line.
543 
	- gdevtfax.c applied &amp; to an array member of a structure.
544 
 
545 
Changes the param_list interface slightly: Implementations of the
546 
put_params driver procedure should now use param_signal_error to report
547 
errors, and should not give up at the first error.  (Even though this is a
548 
non-backward-compatible change, old implementations will continue to work;
549 
they just won't deliver complete results to the setpagedevice Policies
550 
machinery.)
551 
 
552 
</pre><h3><a name="V2.9.8_Platforms"></a>Platforms</h3><pre>
553 
Fixes bugs:
554 
	- Removes the time zone adjustment from gp_get_clock in gp_unix.c,
555 
since the value returned by all Unix systems is bogus.
556 
	- The DV/X makefile still included the dfaxhigh and dfaxlow drivers.
557 
	- gssetmod.com (VMS command file) didn't work properly if the
558 
argument list was empty.
559 
	- vms.mak, vms-axp.mak, and modules.lis hadn't been updated to
560 
reflect changes in 2.9.7.
561 
	- The MS Windows version wouldn't link (overflowed the 64K primary
562 
data segment).
563 
 
564 
</pre><h3><a name="V2.9.8_Fonts"></a>Fonts</h3><pre>
565 
Makes the font substitution algorithm somewhat more intelligent.
566 
 
567 
</pre><h3><a name="V2.9.8_Interpreter"></a>Interpreter</h3><pre>
568 
Fixes bugs:
569 
	- Enumerating the pointers of a zero-length array of structures
570 
caused a divide by zero.
571 
	- iref.h didn't protect itself against multiple inclusion.
572 
	- The CCITTFaxEncode filter didn't byte-align the final
573 
end-of-block code if EndOfBlock and EncodedByteAlign were both true.
574 
	- make_initial_dict in iinit.c used `name' as a formal parameter
575 
name, which some compilers believe conflicts with a typedef.
576 
	- Not all internal operators had registered names.
577 
	- The GC used memcpy, rather than bytes_copy, when compacting
578 
objects, even though the source and destination might overlap.
579 
	- When debugging was enabled, gc_string_mark could give a spurious
580 
error indication.
581 
	- vmstatus returned too small a value for the maximum VM.
582 
	- The scanner could get into a loop when reading a radix-85 string.
583 
	- The GC could get into a state where it was called after every
584 
allocation (because of the patch setting global = true in ireclaim).
585 
	- The general path filling algorithm didn't skip regions that were
586 
completely outside the clipping box.
587 
	- The gs_screen_enum structure contained a pointer (porder) that
588 
pointed into the middle of a structure, confusing the GC.
589 
 
590 
Implements the BitmapWidths flag in fonts.  The default of false means that
591 
we use scalable widths even with xfonts.
592 
 
593 
Changes the Generic resource category so that ResourceFileName is optional.
594 
 
595 
Changes the .getdeviceparams operator so that it takes an optional
596 
dictionary giving the set of keys whose values are wanted.  Changes the
597 
.putdeviceparams operator so that it takes an optional policy dictionary
598 
specifying the action to be taken on errors, and returns a list of keys and
599 
errors if it fails, rather than causing an error.  These are
600 
non-backward-compatible changes, but ordinary programs do not use these
601 
operators.
602 
 
603 
Changes the names of some internal operators and procedures by adding
604 
a . to the beginning:
605 
	currenttime
606 
	devicename
607 
 
608 
Implements currentpagedevice, and a small subset of setpagedevice.  Only
609 
the following keys in the page device dictionary are known to the current
610 
implementation, and the ones marked with * are not actually processed:
611 
	PageSize
612 
	InputAttributes
613 
	MediaColor, MediaWeight, MediaType, InsertSheet
614 
	  (for InputAttributes matching only)
615 
	*ImagingBBox
616 
	OutputAttributes
617 
	OutputType
618 
	  (for OutputAttributes matching only)
619 
	NumCopies
620 
	HWResolution
621 
	*Margins
622 
	*Orientation (for all devices, not just roll devices)
623 
	Policies
624 
	Install
625 
	BeginPage
626 
	EndPage
627 
Does not implement:
628 
	- Updating InputAttributes or OutputAttributes by sensing the state
629 
	  of the device;
630 
	- Retrying media matching after an initial failure;
631 
	- Automatic handling of portrait vs. landscape page size;
632 
	- Recording the CTM after Install as the one to be used for
633 
	  defaultmatrix, initmatrix, and initgraphics.
634 
Also, media matching is normally disabled (with InputAttributes = null)
635 
for all devices.  ****** We had to disable setpagedevice just before
636 
shipping this release, because of interactions with the older device
637 
handling machinery that we could not fix in the time available.
638 
 
639 
</pre><h3><a name="V2.9.8_Library"></a>Library</h3><pre>
640 
Fixes bugs:
641 
	- 24-bit color (mem_true24_fill_rectangle and _copy_mono) had
642 
algorithm bugs.
643 
	- A complex conditional expression in gx_render_gray wouldn't
644 
compile properly with the DECStation 3100 Ultrix 4.3 compiler.
645 
	- The GC routines for gx_device_clip didn't handle the case where
646 
the 'current' pointer pointed to list.single.
647 
	- gx_add_char_bits used memcpy, rather than bytes_copy, for
648 
compressing character bitmaps, even though the source and destination might
649 
overlap.
650 
	- Some compilers require the definition of st_gstate_contents to
651 
precede the definitions of the GC procedures.
652 
	- Filling a large rectangle (more than 1K of bitmap) with a colored
653 
halftone overwrote random areas of the stack.
654 
 
655 
Changes gs_setcachedevice[2] to take a pointer to an array of floats,
656 
rather than 6 or 10 individual floats.  THIS IS A NON-BACKWARD-COMPATIBLE
657 
CHANGE.
658 
 
659 
Implements the BitmapWidths flag in fonts.
660 
 
661 
</pre>
662 
 
663 
<h2><a name="Version2.9.7b"></a>Version 2.9.7-beta (6/5/94)</h2>
664 
 
665 
<p>
666 
Yet another pre-3.0 beta.  The main features are a fairly reliable
667 
garbage
668 
collector, and function prototypes almost everywhere they are needed.
669 
 
670 
<h3><a name="V2.9.7b_Documentation"></a>Documentation</h3><pre>
671 
Fixes bugs:
672 
	- The comment at the beginning of the zfindlibfile procedure was
673 
incorrect.
674 
 
675 
Replaces the GNU License (the COPYING file) with version 0 of the new
676 
Aladdin Enterprises Free Public License (the PUBLIC file).
677 
 
678 
</pre><h3><a name="V2.9.7b_Procedures"></a>Procedures</h3><pre>
679 
Fixes bugs:
680 
	- The definition of cmykread.dev in gs.mak was incorrect (it
681 
modified color.dev).
682 
 
683 
Adds the ability to specify a value for FONTPATH on the command line
684 
(-sFONTPATH=), overriding GS_FONTPATH.
685 
 
686 
Replaces the -oper2 configuration resource type with the ability to specify
687 
in the op_def list the dictionary in which operators will be defined.  (See
688 
opdef.h for more details.)  This is an internal change only.
689 
 
690 
</pre><h3><a name="V2.9.7b_Utilities"></a>Utilities</h3><pre>
691 
Fixes bugs:
692 
	- viewgif.ps got an error on interlaced GIF files whose height
693 
wasn't a multiple of 8.
694 
 
695 
Changes traceop.ps so it stores the traced operator in the same dictionary
696 
where the operator is currently defined, if possible.
697 
 
698 
</pre><h3><a name="V2.9.7b_Drivers"></a>Drivers</h3><pre>
699 
Fixes bugs:
700 
	- The new G3 fax drivers crashed on page widths greater than 2623
701 
(40 * 64 + 63) pixels.  (We fixed this by disallowing page widths greater
702 
than approximately twice this.)
703 
	- The 24-bit PCX driver had some debugging code accidentally left
704 
in it that produced large volumes of useless console output.
705 
 
706 
Removes the previous (Leffler) TIFF/F driver and the TruFax driver.
707 
 
708 
</pre><h3><a name="V2.9.7b_Platforms"></a>Platforms</h3><pre>
709 
Fixes bugs:
710 
	- time_.h, gp_unix.c, and gp_sysv.c didn't do the right thing on
711 
SVR4 platforms, where gettimeofday only takes 1 argument.
712 
	- The final linking command on Turbo C platforms didn't specify the
713 
COMPDIR directory for the linker.
714 
 
715 
</pre><h3><a name="V2.9.7b_Fonts"></a>Fonts</h3><pre>
716 
 
717 
Changes the standard Fontmap to use the URW contributed fonts as
718 
work-alikes for Helvetica and Times Roman.
719 
 
720 
</pre><h3><a name="V2.9.7b_Interpreter"></a>Interpreter</h3><pre>
721 
Fixes bugs:
722 
	- The garbage collector wasn't in a consistent state.
723 
	- In Level 2 mode, statusdict was allocated in global VM rather
724 
than local VM.
725 
	- resourceforall gave an error on the built-in categories such as
726 
Filter.
727 
	- The file searching algorithm didn't check the current directory
728 
first.
729 
	- When opening a file failed, it didn't return a different error
730 
depending on the problem.
731 
	- The CCITTFaxEncode filter crashed on widths larger than 2623 (64
732 
* 40 + 63) pixels.  (We fixed this by disallowing page widths greater than
733 
approximately twice this.)
734 
	- The .type1getsbw operator gave an invalidfont error if a
735 
CharString started with anything other than a [h]sbw.  (Adobe's published
736 
specs say this is invalid, but some Adobe MultiMaster fonts start with a
737 
callsubr and/or a callothersubr.)
738 
	- When printing out the stack with == after an error, the error
739 
handler got a repeated (and ultimately fatal) typecheck error if it
740 
encountered an object of non-standard type.
741 
	- The token operator could incorrectly attempt to free a structure
742 
on the stack if it encountered an input buffer boundary.
743 
	- string_to_ref didn't correctly set the a_local flag in the string
744 
object it created.
745 
	- If the -c switch was the last switch on the command line,
746 
Ghostscript always exited without going into interactive mode.
747 
	- copy didn't check for errors when copying a dictionary.
748 
 
749 
Makes many minor changes (mostly adding prototypes) to reduce error and
750 
warning messages from gcc and other strict compilers.
751 
 
752 
Adds files containing the 4 predefined PDF encodings (MacRoman, MacExpert,
753 
WinAnsi, and PDFDoc).
754 
 
755 
</pre><h3><a name="V2.9.7b_Library"></a>Library</h3><pre>
756 
Fixes bugs:
757 
	- image_bbox in gxccman.c could produce a division by 0 if a
758 
0-width character was being entered into the cache.
759 
	- gx_image_cached_char incorrectly specified a scale of 2x2 rather
760 
than 1x1 if it had to read bits from an xfont.
761 
	- Stale pointers in the halftone cache weren't cleared properly by
762 
a restore.  (We fixed this by making grestoreall clear the halftone cache.)
763 
	- setdash used gs_malloc, rather than the current allocator, for
764 
allocating the dash pattern.
765 
	- If one attempted to fill a very wide region with a colored
766 
halftone, gx_dc_ht_colored_fill_rectangle would loop indefinitely.
767 
	- The container_offset in clipping devices was set incorrectly,
768 
causing the garbage collector to mangle pointers.
769 
 
770 
Changes the fopen routine in IODevices so that it can return an arbitrary
771 
error code, rather than simply succeeding or failing.  THIS IS A
772 
NON-BACKWARD-COMPATIBLE CHANGE.  It only affects IODevice implementations,
773 
of which there are very few.  (It doesn't affect ordinary device drivers.)
774 
 
775 
Changes the char_metrics xfont procedure so it returns the width as
776 
floating point numbers rather than integers.  THIS IS A
777 
NON-BACKWARD-COMPATIBLE CHANGE.  It only affects xfont implementations, of
778 
which there are very few.
779 
 
780 
Makes many minor changes (mostly adding prototypes) to reduce error and
781 
warning messages from gcc and other strict compilers.
782 
 
783 
</pre>
784 
 
785 
<h2><a name="Version2.9.6b"></a>Version 2.9.6-beta (5/23/94, not
786 
distributed to the public)</h2>
787 
 
788 
<p>
789 
This, too, was supposed to be the last beta release for public
790 
release 3.0.
791 
It was created primarily for a user who desperately needed a Level 1 system
792 
that would run properly on a 64-bit hardware architecture.  The garbage
793 
collector is badly broken (it's in the middle of an architectural change);
794 
setpagedevice is still not implemented.
795 
 
796 
<h3><a name="V2.9.6b_Documentation"></a>Documentation</h3>
797 
 
798 
<pre>
799 
Documents the standard location of Type 1 fonts on AIX.
800 
 
801 
Changes the last few mentions of Ghostview for Microsoft Windows to GSview
802 
for Windows.
803 
 
804 
Notes that Solaris 2.n provides the X11 header files in a different place.
805 
 
806 
Changes README to reflect the differentiation between Aladdin Ghostscript
807 
and GNU Ghostscript.
808 
 
809 
</pre>
810 
<h3><a name="V2.9.6b_Procedures"></a>Procedures</h3>
811 
 
812 
<pre>
813 
Fixes bugs:
814 
	- The compilation rules for the modules that call the IJG library
815 
used -Ijpeg rather than -I$(JPEGSRC).
816 
	- The rule for gslib.dev omitted echogs$(XE) as a prerequisite.
817 
 
818 
Makes it possible to define the values of buildtime, copyright, revision,
819 
revisiondate, and serialnumber in the makefile.
820 
 
821 
</pre><h3><a name="V2.9.6b_Utilities"></a>Utilities</h3><pre>
822 
Fixes bugs:
823 
	- The viewgif.ps utility didn't handle local color tables.
824 
 
825 
Updates ps2ai.ps to version 1.81.
826 
 
827 
</pre><h3><a name="V2.9.6b_Drivers"></a>Drivers</h3><pre>
828 
Fixes bugs:
829 
	- The TIFF and fax devices used some identical names, causing
830 
linker complaints.
831 
	- The bj10e/bj200 driver inadvertently disabled the sheet feeder.
832 
(The change may not actually fix this bug, since we don't have either of
833 
these printers with a sheet feeder to test it on.)
834 
	- The 'bit' device didn't map colors to pixel values correctly.
835 
	- The monochrome PCL driver didn't work around the fact that the
836 
Canon LBP4i printer didn't clear its seed row correctly.
837 
 
838 
Adds new drivers:
839 
	- A user-contributed driver for the H-P DesignJet 650C.
840 
	- A user-contributed driver for the Canon LIPS III printer.
841 
	- A completely new tiffg3 driver with one based on the new, fast
842 
faxg3 code.  This driver does not include any external code, and carries an
843 
Aladdin copyright.
844 
	- A tiffg4 driver, also based on the fast CCITT filter code.
845 
 
846 
Removes the tiffg3x driver that appeared briefly in 2.9.5, and renames the
847 
previous (Leffler) tiffg3 driver as tiffg3x.
848 
 
849 
Adds support for A0, A1, and A2 paper sizes to PCL drivers.
850 
 
851 
Changes all the names involving "props" to "params", for consistency with
852 
the header files, some other internal interfaces, and Adobe's terminology.
853 
THIS IS A NON-BACKWARD-COMPATIBLE CHANGE.  However, it only affects devices
854 
that implement their own get_props and put_props procedures, of which there
855 
aren't very many.
856 
 
857 
</pre><h3><a name="V2.9.6b_Platforms"></a>Platforms</h3><pre>
858 
Fixes bugs:
859 
	- The DV/X makefile used X11 rather than X for the X11 library name.
860 
	- The DV/X makefile incorrectly included the PC display drivers.
861 
	- The DV/X makefile omitted gp_dosfs.$(OBJ) from the list of
862 
platform-specific files.
863 
	- The DV/X makefile used : rather than ; for separating directory
864 
names in GS_LIB_DEFAULT.
865 
	- x_.h omitted a needed alias for XtAppSetFallbackResources.
866 
	- The makefile entry for System V Unix systems didn't include
867 
gp_unifn.$(OBJ).
868 
	- The comment before LDFLAGS in the gcc makefiles incorrectly
869 
suggested using the -x switch on Ultrix platforms.
870 
	- The forward declaration of quant_params in zfdct.c upset the Sun
871 
compiler because it declared a parameter as float rather than floatp.
872 
*	- The Microsoft C compiler, like the Borland C compilers, only
873 
compares the offset part of segmented pointers.
874 
 
875 
</pre><h3><a name="V2.9.6b_Fonts"></a>Fonts</h3><pre>
876 
 
877 
Adds a fontmap suitable for use with Adobe Type Basics.
878 
 
879 
</pre><h3><a name="V2.9.6b_Interpreter"></a>Interpreter</h3><pre>
880 
Fixes bugs:
881 
	- The STACK_LOOP_BEGIN macro in istack.h didn't work correctly on
882 
segmented systems.
883 
	- The end_phase procedure in igc.c didn't work correctly on
884 
segmented systems.
885 
	- Indexed color spaces didn't mark their base space properly when
886 
garbage collecting.
887 
	- The garbage collector didn't work on segmented systems, because
888 
it smashed the lsize field of large objects with mark/reloc information.
889 
	- Some structures didn't have correct associated GC procedures:
890 
gs_indexed_map, gs_client_pattern, gs_pattern_instance.
891 
	- restore could free names or stack segments that were still
892 
referenced.
893 
*	- If a packed object caused an error, the error object could be set
894 
to garbage rather than the correct object.
895 
*	- Badly designed error handlers which use $error for temporary
896 
storage could cause a dictfull error.
897 
	- Some compilers objected to the use of "dict" as a variable name
898 
in a scope where it was defined as a type.
899 
	- IODevices were declared const and non-const inconsistently.
900 
	- setpagedevice popped one object too many off the stack if the
901 
request included any subdictionaries that needed to be merged.
902 
	- More garbage collector bugs were fixed.
903 
	- If the current stack block was empty, Level 2 restore would give
904 
a spurious typecheck error.
905 
	- The CCITTFaxEncode filter could get confused if it emptied the
906 
input and filled the output at the same time.
907 
	- The CCITTFaxEncode filter could insert an extra EOL if it had to
908 
suspend at certain times.
909 
	- The new parser for literal strings (as of 2.9.5) could mis-count
910 
internal parentheses if a parenthesis caused the internal buffer collecting
911 
the string to overflow.
912 
	- If the current stack block had fewer than 3 elements,
913 
.type1addpath could report a spurious typecheck error.
914 
	- Text rendering operations (show, stringwidth, etc.) caused a
915 
crash if the current color was a Pattern that hadn't already been
916 
rasterized.
917 
	- If a program did a grestore when the graphics state stack was
918 
empty, the graphics state was initialized to unexpected (and, in some
919 
cases, invalid) values.
920 
	- pathforall could cause a bogus stackoverflow if it overflowed the
921 
current stack block.
922 
	- Closing an encoding filter with a procedure as target left the
923 
filter on the stack.
924 
*	- The outer loop in dict_lookup() could cause an addressing fault
925 
on segmented machines when looking up Level 2 operators, because the offset
926 
could get decremented past 0.
927 
	- There was an = instead of an == in a test in scanner_reloc_ptrs.
928 
	- The call on gs_reloc_refs in sproc_reloc_ptrs in zfproc.c omitted
929 
the last (gcst) argument.
930 
 
931 
(Re-)implements the 2-D case of CCITTFaxEncode, and fixes a couple of bugs
932 
in it.
933 
 
934 
Adds DiffEncode and DiffDecode filters that implement color prediction for
935 
the PDF variant of the LZWDecode filter.
936 
 
937 
Changes the specification of .oserrorstring to be similar to getenv,
938 
where, etc.  THIS IS A NON-BACKWARD-COMPATIBLE CHANGE; however, no
939 
user-written code should be using .oserrorstring.
940 
 
941 
Adds oversampling for better character rasterizing.
942 
 
943 
</pre><h3><a name="V2.9.6b_Library"></a>Library</h3><pre>
944 
Fixes bugs:
945 
	- gx_dc_ht_colored_fill_rectangle gave a compiler warning because
946 
of a problem with const pointers.
947 
	- dfmul2fixed_vars (in gxfixed.h) omitted the &amp; before vda on
948 
big-endian platforms, causing compilation errors.
949 
	- IODevices were declared const and non-const inconsistently.
950 
	- The Type 1 rasterizer never enabled overshoot suppression.
951 
	- stroke didn't fatten the line properly if stroke adjustment was
952 
enabled, or if the line was horizontal or vertical.
953 
*	- The clipping test for characters was too strict by almost 1
954 
pixel, leading to unnecessary clipping of text at the edge of the clipping
955 
box.
956 
*	- The initial clipping box was computed incorrectly for devices
957 
whose initial transformation matrix included a rotation.
958 
 
959 
Changed the implementation of clipping lists and show enumerators to use
960 
separate objects rather than embedded objects, to pacify the GC.  (This is
961 
an internal change, not visible at the PostScript or API level.)
962 
 
963 
Makes the character cache trim off left and right blank areas, as well as
964 
top and bottom.  (Internal change.)
965 
 
966 
Adds oversampling for better character rasterizing.
967 
 
968 
</pre>
969 
 
970 
<h2><a name="Version2.9.5b"></a>Version 2.9.5-beta (4/11/94)</h2>
971 
 
972 
<p>
973 
This was supposed to be the last beta release before 3.0, but it
974 
won't be.
975 
The only known major defects are the unreliable garbage collector, and the
976 
dummy implementation of setpagedevice/currentpagedevice.
977 
 
978 
<h3><a name="V2.9.5b_Documentation"></a>Documentation</h3>
979 
 
980 
<pre>
981 
Fixes bugs:
982 
	- The file commnew.doc didn't belong in the fileset.
983 
 
984 
Notes in the makefiles that SVR4 systems may need to set EXTRALIBS=-lnsl.
985 
 
986 
Adds a user-contributed `man' page for the ps2epsi utility.
987 
 
988 
</pre><h3><a name="V2.9.5b_Procedures"></a>Procedures</h3><pre>
989 
Fixes bugs:
990 
	- The IJG files didn't compile properly by themselves, because they
991 
didn't have $(AK) in their dependency list.
992 
 
993 
Changes back the handling of files named on the command line, so that they
994 
are first sought in the current directory, and if that fails, use the
995 
search path.  (2.9.4-beta changed things so that files on the command line
996 
did not use the search path, because as of that version, the search path
997 
doesn't necessarily include the current directory.  I consider the "check
998 
the current directory and then use the search path" rule, which is the
999 
MS-DOS standard and was used in Ghostscript prior to 2.9.4, a serious
1000 
mistake, since it is one of the best-known security holes in Unix and can
1001 
also produce confusing and unexpected results depending on the current
1002 
directory; I would much rather have a clear distinction between
1003 
user-specified files, which should not use any path searching, and system
1004 
files, that only use the defined search path.  However, as of this moment,
1005 
users seem to want the convenience at the expense of insecurity and
1006 
confusion.)
1007 
 
1008 
Adds '.' to the beginning of the search path for MS-DOS platforms, to
1009 
conform to the usual MS-DOS file searching convention.
1010 
 
1011 
Adds a -c ("code") switch, which interprets following arguments (until the
1012 
next switch) as PostScript tokens.
1013 
 
1014 
Changes the handling of FEATURE_DEVS so that either level1.dev or
1015 
level2.dev must normally be selected.  THIS IS A NON-BACKWARD-COMPATIBLE
1016 
CHANGE for Level 1 systems, which formerly set FEATURE_DEVS to an empty
1017 
definition.
1018 
 
1019 
</pre><h3><a name="V2.9.5b_Utilities"></a>Utilities</h3><pre>
1020 
Fixes bugs:
1021 
	- bench.ps didn't switch back to local VM properly before running
1022 
the program being benchmarked.
1023 
 
1024 
Adds a ppmsetpagesize command to the pstoppm utility.
1025 
 
1026 
</pre><h3><a name="V2.9.5b_Drivers"></a>Drivers</h3><pre>
1027 
Fixes bugs:
1028 
	- The PCX and GIF drivers used an incorrect algorithm for computing
1029 
the blue component of the color palette, which could cause colors to come
1030 
out with not quite enough blue.
1031 
	- The SPARCprinter driver wouldn't compile with non-ANSI compilers.
1032 
 
1033 
Adds new drivers:
1034 
	- A user-contributed driver for DEC sixel displays like the VT240
1035 
(sxlcrt, in gdevln03.c, which has a FSF copyright.)
1036 
	- A much larger and supposedly faster version of the TIFF/F driver
1037 
(tiffg3x, in gdevtifx.c), contributed by a user.  This has the same
1038 
copyright as the TIFF/F driver (gdevtiff.c).
1039 
	- A driver (faxg3, in gdevfax.c) that produces plain Group 3 fax
1040 
output with no header, using the CCITTFaxEncode filter to do the work.
1041 
(This is around 2.5-3 times as fast as the other fax drivers distributed
1042 
with Ghostscript.)
1043 
	- A user-contributed driver for the Mitsubishi CP50 color printer.
1044 
 
1045 
Changes the `bit' driver so one can set the Colors and *Values properties.
1046 
 
1047 
Makes the color mapping for PC displays, PCX files, and GIF files identical
1048 
(they differed slightly before).
1049 
 
1050 
</pre><h3><a name="V2.9.5b_Platforms"></a>Platforms</h3><pre>
1051 
Fixes bugs:
1052 
	- VMS used DISPLAY rather than DECW$DISPLAY to get the display name
1053 
if opening the display failed.
1054 
	- Many minor bugs relating to OS/2 and Win32 were fixed.
1055 
	- On Unix and DV/X platforms, the install script didn't mkdir
1056 
$(gsdir), and didn't mkdir the intermediate directory for the man page.
1057 
	- On BSD and UTek platforms, the declaration of memset in
1058 
memory_.h, and the definition in gsmisc.c, conflicted with the ANSI
1059 
declaration.
1060 
	- One of the SPARC compilers compiled the intersection computation
1061 
in arc_either (gspath.c) incorrectly.
1062 
	- The temporary file names created under OS/2 could exceed the 8.3
1063 
length limit.
1064 
 
1065 
</pre><h3><a name="V2.9.5b_Interpreter"></a>Interpreter</h3><pre>
1066 
Fixes bugs:
1067 
	- The test files for the IJG library had been damaged by EOL
1068 
conversion.
1069 
	- The garbage collector didn't mark some of the most recently
1070 
created names.
1071 
	- The interpreter would sometimes report a typecheck instead of a
1072 
stackunderflow.
1073 
	- If aload didn't have enough room on the stack, it would report a
1074 
rangecheck rather than a stackoverflow.
1075 
	- zcontext wouldn't compile, because it hadn't been updated to the
1076 
new GC interfaces.
1077 
	- The definition of private_st_stream_proc_state in ifilter.h ended
1078 
with a semicolon, which upset some compilers.
1079 
	- load didn't check to make sure that the dictionaries it examined
1080 
had read access.
1081 
	- cvrs didn't handle negative numbers in radix 2 or 3 properly.
1082 
	- The allocator could become confused if it was asked to allocate a
1083 
large array.
1084 
	- readline gave an ioerror rather than a rangecheck if it
1085 
overflowed the string.
1086 
	- The allocator didn't free packed arrays properly.
1087 
	- The allocator's check for LIFO freeing of arrays was off by 1, so
1088 
it never succeeded.
1089 
	- The undercolor removal and black generation procedures weren't
1090 
initialized properly.
1091 
	- If the interpreter couldn't find gs_init.ps, it returned a random
1092 
exit code.
1093 
	- If an operator expected a procedure and didn't get one, it
1094 
sometimes gave an invalidaccess rather than a typecheck.
1095 
	- Unix file enumeration often did the wrong thing if there were
1096 
directories in the pattern.
1097 
	- The ASCIIHexDecode filter read an extra character after the
1098 
terminating &gt;.
1099 
	- scalefont didn't fill in ScaleMatrix properly.
1100 
	- The CCITTFaxEncode filter crashed if the width of the page wasn't
1101 
a multiple of 8 bits.
1102 
	- The error printing code used .languagelevel, which wasn't defined
1103 
in Level 1 configurations.
1104 
	- setpagedevice didn't pop its argument.
1105 
	- Definitions in statusdict didn't change according to the current
1106 
language level.
1107 
	- Separation color spaces didn't allow strings as color space names.
1108 
	- Due to a bug in chunk_locate_ptr, the garbage collector sometimes
1109 
decided incorrectly that a pointer was pointing outside collectable space.
1110 
	- (Many other garbage collector bugs were fixed.)
1111 
 
1112 
Implements additional Level 2 features:
1113 
	- Garbage collection for strings.
1114 
	- Expandable operand and dictionary stacks, and the ability to set
1115 
	the maximum size of these stacks.
1116 
	- Additional user and system parameters.  The following are dummies:
1117 
	AccurateScreens, JobName, JobTimeout, WaitTimeout.
1118 
	- Procedure-based filters usable with cvx/exec and token.
1119 
	- Separation color spaces (always using the alternate space).
1120 
	(These were theoretically implemented in version 2.6, but they were
1121 
	never tested and were actually missing most of the implementation.)
1122 
	- VMThreshold and VMReclaim for invoking GC automatically.
1123 
 
1124 
Adds a hook in iscan.c for parsing DSC comments.
1125 
 
1126 
Adds encoding and decoding filters for the BCP and TBCP protocols.  These
1127 
are not fully implemented yet:
1128 
	- The interrupt and status request characters are ignored on input,
1129 
	and never generated on output;
1130 
	- The TBCP encoder doesn't emit the start-of-protocol string;
1131 
	- The TBCP decoder doesn't recognize the end-of-protocol string.
1132 
 
1133 
Factors out Type 1 font capability as a separate feature.
1134 
 
1135 
Changes the names of some files:
1136 
	packed.h to ipacked.h;
1137 
	bnum.h to ibnum.h.
1138 
 
1139 
Changes the name of the value.index member of a ref to value.boolval.
1140 
(Internal change only.)
1141 
 
1142 
</pre><h3><a name="V2.9.5b_Library"></a>Library</h3><pre>
1143 
Fixes bugs:
1144 
	- The definition of RELOC_PTRS_BEGIN in gsstruct.h wouldn't compile
1145 
properly with non-ANSI compilers.
1146 
	- The JPEG library wouldn't compile properly with non-ANSI compilers.
1147 
*	- The platform font machinery gave up too easily in some cases.
1148 
	- CMYK devices needing halftoning converted the CMYK color to RGB.
1149 
	- The debugging code in arc_add (gspath.c) didn't print the output
1150 
values correctly.
1151 
 
1152 
Factors out Type 1 font capability as a separate feature.
1153 
 
1154 
</pre>
1155 
 
1156 
<h2><a name="Version2.9.4b"></a>Version 2.9.4-beta (2/19/94)</h2>
1157 
 
1158 
<h3><a name="V2.9.4b_Procedures"></a>Procedures</h3>
1159 
 
1160 
<pre>
1161 
Changes Ghostscript's path searching algorithm so that it does not
1162 
automatically look in the current directory first.  (The former algorithm
1163 
was more MS-DOS-like; the new one is more Unix-like.)  If you want to
1164 
include the current directory, you must include '.' in the search path.
1165 
THIS IS A NON-BACKWARD-COMPATIBLE CHANGE.
1166 
 
1167 
Adds two new resource types for genconf.c:
1168 
	- -header filexxx.h adds #include "filexxx.h" to gconfig.h.
1169 
	- -libpath dir adds dir to the list of library search paths.
1170 
 
1171 
</pre><h3><a name="V2.9.4b_Utilities"></a>Utilities</h3><pre>
1172 
Fixes bugs:
1173 
	- impath.ps (used by bdftops) computed the starting X coordinate
1174 
incorrectly, typically causing characters to be displaced slightly to the
1175 
right.
1176 
	- pstoppm.ps didn't handle local and global VM properly.
1177 
 
1178 
Adds a ps2ai.ps utility, contributed by a user, for converting arbitrary
1179 
PostScript files into a form compatible with Adobe Illustrator.
1180 
 
1181 
</pre><h3><a name="V2.9.4b_Drivers"></a>Drivers</h3><pre>
1182 
 
1183 
Adds new drivers:
1184 
	- A user-contributed driver for Imagen Impress laser printers.
1185 
	- A user-contributed driver for the DEC LA75plus printer.
1186 
 
1187 
</pre><h3><a name="V2.9.4b_Platforms"></a>Platforms</h3><pre>
1188 
 
1189 
Under OS/2, adds the ability to keep Ghostscript in memory for a
1190 
specified number of minutes.
1191 
 
1192 
Adds support for Win32 and Win32s.
1193 
 
1194 
Changes the MS Windows platform font interface so that it does not attempt
1195 
to render fonts at sizes smaller than 6 pixels.  Changes the X Windows
1196 
interface, which already did this for 4-point and smaller fonts, to also
1197 
use a lower limit of 6 pixels.  Also changes the X Windows platform font
1198 
machinery so it does not render fonts at sizes larger than 36 pixels: at
1199 
large sizes, Ghostscript does a perfectly good job, and some X font servers
1200 
rasterize the entire font and lock up the entire window system while doing
1201 
so.
1202 
 
1203 
</pre><h3><a name="V2.9.4b_Interpreter"></a>Interpreter</h3><pre>
1204 
Fixes bugs:
1205 
	- currentdash always returned a new array of reals, rather than the
1206 
actual argument of setdash.
1207 
	- Strings in binary object sequences read in as integers.
1208 
	- Because of a bug in chunk_locate_ptr, some large objects didn't
1209 
get freed properly.
1210 
	- If an error occurred while processing an image, Ghostscript would
1211 
attempt to free random blocks of storage.
1212 
	- Input filters discarded trailing data, rather than filling it out
1213 
with zeros.  (This is now fixed for ASCIIHexDecode and ASCII85Decode; it's
1214 
not clear what other filters it should affect.)
1215 
	- The ASCII85Encode filter produced garbage output for the final
1216 
1-4 bytes before EOD.
1217 
*	- The TIFF output driver produced incorrect output for the second
1218 
and subsequent pages if the output was being produced on multiple files.
1219 
*	- The default handleerror did a 'stop', which was not correct.
1220 
	- gpcheck.h converted all positive return codes to 0 if interrupt
1221 
checking was enabled.
1222 
	- Images with multiple data sources didn't work.
1223 
	- Images with 12-bit sample values didn't work.
1224 
	- Images with a file as the data source read additional data beyond
1225 
what was required.
1226 
	- 2 vmreclaim worked (pretty much), but 1 vmreclaim didn't.
1227 
	- If %lineedit was opened multiple times, characters from later
1228 
openings overwrote characters from earlier ones.
1229 
	- token returned garbage for the "remaining string" result when
1230 
reading from a string, if it actually read all of the string.  (New bug in
1231 
2.9.2, probably.)
1232 
 
1233 
Implements additional Level 2 features:
1234 
	- DCTEncode and DCTDecode filters.
1235 
	- Filters with procedures as the data source or target.
1236 
	(Except for token and cvx/exec.)
1237 
	- Garbage collection for names.
1238 
 
1239 
Changes the error printout so that strings are always truncated at 200
1240 
characters.
1241 
 
1242 
For Level 2 systems, changes the initial setting of the object format
1243 
parameter from 0 to an appropriate non-zero value.
1244 
 
1245 
* Changes the .quit operator so that it takes two operands, an error object
1246 
and an error code; if the latter is negative, the interpreter returns this
1247 
as the error code, rather than e_Quit.
1248 
 
1249 
Makes StandardEncoding and ISOLatin1Encoding arrays, rather than packed
1250 
arrays, on large-memory systems, for compatibility with certain test
1251 
suites.  Changes .registerencoding to accept arrays as well as packed
1252 
arrays.
1253 
 
1254 
</pre><h3><a name="V2.9.4b_Library"></a>Library</h3><pre>
1255 
Fixes bugs:
1256 
	- Due to an error in cie_mult3, CIE-based colors were badly
1257 
mis-mapped.
1258 
*	- Very narrow (but not empty) rectangles would disappear.
1259 
*	- Small halftone cells could smash the next higher entry in the
1260 
halftone cache.
1261 
	- The orientation algorithm in gxstroke.c still interchanged
1262 
clockwise and counter-clockwise coordinate systems (after having been
1263 
"fixed" at least 3 times).
1264 
	- Stroking 1-pixel-wide lines shortened them, instead of
1265 
lengthening them, if non-butt caps were requested.
1266 
 
1267 
Refactors mem_mapped8_copy_mono because of limitations in the bcc32
1268 
compiler.
1269 
 
1270 
</pre>
1271 
 
1272 
<h2><a name="Version2.9.3b"></a>Version 2.9.3-beta (1/19/94)</h2>
1273 
 
1274 
<p>This version was created for evaluation purposes for a few users who
1275 
needed Level 2 capability; it was never released to anyone else, even
1276 
beta testers.
1277 
 
1278 
<h3><a name="V2.9.3b_Documentation"></a>Documentation</h3><pre>
1279 
Fixes bugs:
1280 
	- The description of psview and xpsview was incorrect.
1281 
 
1282 
</pre><h3><a name="V2.9.3b_Procedures"></a>Procedures</h3><pre>
1283 
Changes the installation directories for Unix and similar systems to put
1284 
Ghostscript data in $(datadir)/ghostscript/gs-NN.NN.NN rather than directly
1285 
in $(datadir)/ghostscript.  (Fonts still go in $(datadir)/ghostscript/fonts.)
1286 
 
1287 
</pre><h3><a name="V2.9.3b_Drivers"></a>Drivers</h3><pre>
1288 
Fixes bugs:
1289 
	- Some spaces were incorrectly replaced with tabs in the help
1290 
message in the 3B1 display driver.
1291 
	- The BMP driver wrote a spurious scan line at the beginning
1292 
of its output.
1293 
	- The monochrome PCX driver had the two palette elements
1294 
interchanged.
1295 
 
1296 
Adds new drivers:
1297 
	- A user-contributed driver for the Xerox XES printer format.  This
1298 
has a FSF copyright.
1299 
	- A user-contributed driver for the Epson AP3250 printer.  (This is
1300 
the same as the Stylus 800, with slightly different margins.)
1301 
	- A user-contributed driver for the DEC LA70 printer with some
1302 
algorithms for improving text at low resolutions.  This has a FSF
1303 
copyright.
1304 
	- A user-contributed driver for an intermediate-resolution mode
1305 
for 9-pin "Epson-compatible" printers.
1306 
 
1307 
Changes the name of the Stylus 800 driver from escp2 to st800.
1308 
 
1309 
Adds a compile-time flag to the Epson driver to cope with Panasonic 9-pin
1310 
printers, which sometimes have trouble mixing graphics and tabs.
1311 
 
1312 
</pre><h3><a name="V2.9.3b_Platforms"></a>Platforms</h3><pre>
1313 
Fixes bugs:
1314 
	- The MS Windows driver (gp_mswin.c) referred to iodev.h rather
1315 
than gxiodev.h.
1316 
	- On Unix System V platforms, gp_unifs.c and gdevpipe.c were
1317 
incorrectly omitted from the link list.
1318 
	- (Some?) System V platforms don't have the S_ISDIR macro,
1319 
requiring a change in stat_.h.
1320 
	- The Unix `install' target didn't install gs_std_e.ps and
1321 
gs_iso_e.ps.
1322 
	- No MODULES.LIS file was provided for VMS.
1323 
 
1324 
Adds Desqview/X makefiles that actually work.
1325 
 
1326 
Documents the set of H-P-supplied patches needed to make H-P's
1327 
compilers process Ghostscript.
1328 
 
1329 
Changes the MS Windows driver so that if the user presses the Enter key
1330 
while the image window has the focus, the text window will be brought to
1331 
the top and made the active window.  This is useful when viewing a
1332 
multi-page document with Ghostscript.
1333 
 
1334 
</pre>
1335 
<h3><a name="V2.9.3b_Interpreter"></a>Interpreter</h3><pre>
1336 
Fixes bugs:
1337 
	- The definition of public_st_client_color() in gxccolor.h
1338 
included an extraneous semicolon.
1339 
	- The definition of private_st_AXD_state() in sfilter.h included an
1340 
extraneous semicolon.
1341 
	- saxx.c didn't include sfilter.h, which it needed for the
1342 
definition of private_st_AXD_state().
1343 
	- ialloc_struct failed to create a separate chunk if the structure
1344 
was very large.
1345 
	- setcolorspace didn't allocate the colorspace object in the same
1346 
VM space as the graphics state, causing problems when the colorspace was
1347 
freed.
1348 
	- In rare circumstances, currentfile could return an empty array
1349 
rather than a file.
1350 
	- Dictionary keys were always allocated in global VM.
1351 
	- If NOPLATFONTS was true, definefont didn't check whether the
1352 
dictionary was read-only before trying to insert an ExactSize key.
1353 
	- startjob could get an invalidaccess error, because serverdict was
1354 
allocated in global VM.
1355 
	- Using definefont with an already registered font created a
1356 
circular list structure.
1357 
	- If a PostScript procedure appeared as a CharString in a Type 1
1358 
font, it was always called with the character name, never the character
1359 
code.
1360 
	- The SubFileDecode filter didn't work with a non-empty EOD string
1361 
(went into an endless loop).  (Probably a new bug in 2.8.)
1362 
	- save/restore didn't properly restore the maxlength of a
1363 
dictionary, causing data to get smashed at random.  (New bug in 2.9.)
1364 
	- save didn't mark objects as old, so a nested restore had no
1365 
effect.  (New bug in 2.9.2.)
1366 
	- After returning from an OtherSubrs callback, op_type1_free
1367 
freed the saved interpreter state incorrectly.  (New bug in 2.7.)
1368 
	- Level 1 configurations didn't work because .makeoperator gave an
1369 
invalidaccess error.  (New bug in 2.9.2.)
1370 
	- ASCII85 string literals didn't work.  (Probably a new bug in 2.8.)
1371 
	- If the current global/local allocation mode was different at the
1372 
end of a file than at the beginning, an addressing fault could occur
1373 
(gs_unregister_root in gs_run_string).  (New bug in 2.9.2.)
1374 
	- After a setfileposition on a file open for reading,
1375 
fileposition would return an incorrect value, even though the stream
1376 
was actually repositioned properly.
1377 
 
1378 
Brings the dictionary unpacking code for the DCT filters into line with
1379 
Adobe Technical Note 5116, which describes the Picky parameter for
1380 
DCTDecode and the NoMarker, Resync, Blend, Picky, and Relax parameters for
1381 
DCTEncode.
1382 
 
1383 
Changes the .quit operator so that if given a negative argument, the
1384 
interpreter returns this as the error code, rather than e_Quit.
1385 
 
1386 
Changes the Ghostscript integer version number from 100P+10S+T to
1387 
10000P+100S+T.
1388 
 
1389 
Changes the default halftone screen for high-resolution devices, both
1390 
black-and-white and color.
1391 
 
1392 
</pre><h3><a name="V2.9.3b_Library"></a>Library</h3><pre>
1393 
Fixes bugs:
1394 
	- The software floating multiply code used with USE_FPU=-1 only
1395 
worked on little-endian platforms.
1396 
	- Specifying a left side bearing to .type1addpath produced an
1397 
inappropriate offset.
1398 
 
1399 
</pre>
1400 
 
1401 
<h2><a name="Version2.9.2b"></a>Version 2.9.2-beta (1/2/94)</h2>
1402 
 
1403 
<p>This version was distributed only to beta testers.  It adds a garbage
1404 
collector and full local and global VM support.  It is the first version
1405 
that sets languagelevel = 2, i.e., claims to be a Level 2 implementation.
1406 
 
1407 
<h3><a name="V2.9.2b_Documentation"></a>Documentation</h3><pre>
1408 
Fixes bugs:
1409 
	- make.doc still referred to use_* variables in gdevx.c, and
1410 
use.doc didn't explain the use* X resources.
1411 
 
1412 
Notes that -Olimit=1000 is needed to compile Ghostscript on AXP systems
1413 
under OSF/1 1.3.
1414 
 
1415 
</pre>
1416 
 
1417 
<h3><a name="V2.9.2b_Utilities"></a>Utilities</h3><pre>
1418 
Fixes bugs:
1419 
	- viewgif.ps did not work with interlaced images.
1420 
	- font2c.ps omitted gsmemory.h from the #include list in compiled
1421 
fonts.
1422 
 
1423 
</pre><h3><a name="V2.9.2b_Drivers"></a>Drivers</h3><pre>
1424 
Fixes bugs:
1425 
	- The MS Windows driver hadn't been updated to work with the
1426 
new additions to the gx_device structure.
1427 
	- The BMP file driver wrote one scan line too many.
1428 
	- The cdj driver omitted an important cast to int in the error
1429 
diffusion code (FSdither macro).
1430 
 
1431 
Changes the SuperVGA drivers to recognize erasepage and reset the
1432 
color table, like the X driver.
1433 
 
1434 
Adds some fragmentary code to begin implementing the PostScript fax
1435 
extensions.
1436 
 
1437 
</pre><h3><a name="V2.9.2b_Platforms"></a>Platforms</h3><pre>
1438 
Fixes bugs:
1439 
	- The procedure initializers for the MS Windows console I/O
1440 
were missing the new reset element.
1441 
	- The makefile entry in bcwin.mak used -fdev rather than -iodev.
1442 
	- The Borland C++ makefiles exceeded MS-DOS's line length limit if
1443 
the compiler files were in the standard Borland directory (BORLANDC).
1444 
	- Some procedures weren't declared with prototypes in gp_vms.c.
1445 
	- Some declarations had to be reordered to pacify the VAX compiler.
1446 
	- Under MS Windows, Ghostscript didn't automatically de-iconify the
1447 
text window to display messages on an error exit.
1448 
	- The Unix makefile rule for gconfig_.h used echogs rather than
1449 
./echogs.
1450 
	- The Microsoft C makefile referred to an obsolete file gs.tr.
1451 
	- gp_unifs.c used strpbrk and strrchr, which some systems lack.
1452 
 
1453 
Updates the OS/2 code and documentation for compatibility with the current
1454 
Ghostscript version.
1455 
 
1456 
</pre><h3><a name="V2.9.2b_Fonts"></a>Fonts</h3><pre>
1457 
Fixes bugs:
1458 
	- The X11 .pfa fonts replaced their .gsf requirements in the
1459 
fontmap, but not distributed with the previous (beta) release.
1460 
 
1461 
Adds fontmaps appropriate for use with DEC Ultrix and OSF/1 systems.
1462 
 
1463 
</pre><h3><a name="V2.9.2b_Interpreter"></a>Interpreter</h3><pre>
1464 
Fixes bugs:
1465 
	- 4-value entries in the Metrics dictionary were interpreted with
1466 
the width and side bearing interchanged.
1467 
	- Objects large enough to require their own chunk were not freed
1468 
properly.
1469 
	- The GS_FONTPATH scanner didn't deal with the possibility that
1470 
opening a file might fail.
1471 
	- The interrupt and timeout errors incorrectly pushed an error
1472 
object on the operand stack.
1473 
	- imagemask gave an error if it was invoked with a dictionary
1474 
argument with a current color space with more than 1 parameter.
1475 
	- definefont insisted that a new font not have a FID entry.
1476 
	- Some places didn't cast char to byte when needed.
1477 
	- An extra element was left on the stack when substituting the
1478 
default font for a font whose file couldn't be found.
1479 
	- The CCITTFaxDecode filter didn't allow the dictionary to be
1480 
omitted.  (The Adobe documentation doesn't allow this, but Adobe
1481 
implementations do.)
1482 
	- When the input came from a pipe (`-') switch, opening a filter on
1483 
currentfile that required more than 1 input byte to make progress would
1484 
cause Ghostscript to hang (in sreadbuf).
1485 
	- The interpreter didn't call gs_set_lib_paths before executing a
1486 
compiled-in initialization file.
1487 
	- A stream could be closed more than once.  (New bug in 2.8.)
1488 
	- The LZW decoder produced incorrect output if a code string was
1489 
too long to fit into a single output buffer.  (New bug as of 2.8.)
1490 
 
1491 
Implements a special check in def to allow construction of systemdict,
1492 
which is stored in global VM but references dictionaries in local VM.
1493 
 
1494 
Implements additional Level 2 features:
1495 
	- %null% and %ram% IODevices.
1496 
	- startjob, exitserver.
1497 
	- Local and global VM (finish).
1498 
	- Garbage collection (for everything except names and strings).
1499 
 
1500 
Moves the procedures for selecting paper size from systemdict to userdict.
1501 
 
1502 
Sets languagelevel to 2 in Level 2 mode, since essentially all of
1503 
Level 2 is now implemented.
1504 
 
1505 
Factors out the Level 1 extended color facilities (CMYK color and
1506 
colorimage) as a separate configuration feature.
1507 
 
1508 
Adds some preliminary code to begin implementing the Adobe BCP and TBCP
1509 
communication protocols.
1510 
 
1511 
Changes the implementation of save and restore so that the bookkeeping
1512 
structures are allocated in the new area, not the old.  (This is an
1513 
internal change not visible at the PostScript level.)
1514 
 
1515 
</pre><h3><a name="V2.9.2b_Library"></a>Library</h3><pre>
1516 
Fixes bugs:
1517 
	- gdevprn used some preprocessor macros in formal argument
1518 
lists that ansi2knr couldn't handle.
1519 
	- pick_cell_size called gs_distance_transform with a 0 argument
1520 
that non-ANSI compilers didn't automatically promote to floating point.
1521 
	- gs_screen_init called hypot with integer arguments that
1522 
non-ANSI compilers didn't automatically promote to floating point.
1523 
	- Some places didn't cast char to byte when needed.
1524 
	- The vx/vy origin adjustment for WMode=1 wasn't implemented.
1525 
	- The pattern cache wasn't initialized properly.
1526 
	- Composite fonts didn't properly decode strings that started with
1527 
an escape sequence, which have a special (undocumented) decoding rule, and
1528 
also didn't properly decode strings with multiple consecutive escape
1529 
sequences.
1530 
 
1531 
Factors out the Level 1 extended color facilities (CMYK color and
1532 
colorimage) as a separate configuration feature.
1533 
 
1534 
</pre>
1535 
 
1536 
<h2><a name="Version2.9.1b"></a>Version 2.9.1-beta (12/7/93)</h2>
1537 
 
1538 
<p>This version was distributed only to beta testers.
1539 
 
1540 
<h3><a name="V2.9.1b_Utilities"></a>Utilities</h3><pre>
1541 
Adds a viewgif.ps utility to view GIF files.  The current version does not
1542 
work with interlaced data, local color tables, or files containing more
1543 
than one image.
1544 
 
1545 
</pre><h3><a name="V2.9.1b_Interpreter"></a>Interpreter</h3><pre>
1546 
Fixes bugs:
1547 
	- putinterval and copy didn't do the right thing if the source and
1548 
destination were aliases for overlapping sections of the same array or
1549 
string.
1550 
	- The DCT filter stub didn't allow the dictionary to be omitted.
1551 
(The Adobe documentation doesn't allow this, but Adobe implementations
1552 
do.)
1553 
 
1554 
Adds an optional dictionary argument to the LZWDecode filter, containing
1555 
InitialCodeLength, FirstBitLowOrder, BlockData, and EarlyChange entries.
1556 
Setting these parameters appropriately allows reading (non-interlaced) GIF
1557 
data directly.
1558 
 
1559 
</pre><h3><a name="V2.9.1b_Library"></a>Library</h3><pre>
1560 
Fixes bugs:
1561 
	- setdash produced inverted output if the pattern had an odd
1562 
number of elements and the offset O had the property that L &lt;= O mod
1563 
2*L, where L was the sum of the pattern elements.
1564 
 
1565 
</pre>
1566 
 
1567 
<h2><a name="Version2.9b"></a>Version 2.9-beta (12/6/93)</h2>
1568 
 
1569 
<p>Like 2.7, this version was created to satisfy a contractual
1570 
requirement,
1571 
and will never be distributed to anyone other than the other party to the
1572 
contract.
1573 
 
1574 
<h3><a name="V2.9b_Documentation"></a>Documentation</h3><pre>
1575 
Notes that Ghostscript runs on IBM PCs and compatibles under DR DOS
1576 
6.0.
1577 
 
1578 
Notes that Ghostscript will run on IBM PCs and compatibles with
1579 
Hercules display cards if you redirect text output to a file.
1580 
 
1581 
Notes that the alternate DeskJet 500C driver (djet500c) does not work
1582 
on the 550C.
1583 
 
1584 
Gives a list of system-specific directories where Type 1 fonts are
1585 
likely to be installed, as a suggested setting for GS_FONTPATH.
1586 
 
1587 
</pre><h3><a name="V2.9b_Procedures"></a>Procedures</h3><pre>
1588 
Changes the distribution script so that it stores all text files in the
1589 
main source archive with Unix end-of-line conventions, but with DOS
1590 
end-of-line conventions in the MS-DOS-specific archive.
1591 
 
1592 
Changes the MS-DOS, MS Windows, and OS/2 makefiles so that 486SX and 486DX
1593 
processors are different CPU_TYPEs.  (The former, designated by
1594 
CPU_TYPE=485, does not include an on-chip FPU.)
1595 
 
1596 
Adds a line to gs_init.ps which can be uncommented to select A4 as
1597 
the default paper size.
1598 
 
1599 
Adds a definable CFLAGS macro to the makefiles, allowing -DA4 to
1600 
select A4 as the default paper size.
1601 
 
1602 
Adds the H-P printer drivers to the standard Unix configurations.
1603 
 
1604 
</pre><h3><a name="V2.9b_Utilities"></a>Utilities</h3><pre>
1605 
Fixes bugs:
1606 
	- If there were no unencoded characters, prfont.ps would get
1607 
an error.
1608 
 
1609 
Changes ansi2knr to accept a wider range of function declaration syntax,
1610 
and to not depend on any Ghostscript header files.
1611 
 
1612 
</pre><h3><a name="V2.9b_Drivers"></a>Drivers</h3><pre>
1613 
Fixes bugs:
1614 
	- Several drivers (DigiFax, Epson LQ-2550, NEC P6) didn't handle
1615 
A4 paper width.
1616 
	- The IBM ProPrinter wasn't being initialized properly.
1617 
	- The Epson driver didn't work properly with compilers that
1618 
insisted on 'char' being a signed type.
1619 
	- The Epson driver ignored its end_string argument, producing
1620 
incorrect end-of-page behavior on some printers.
1621 
 
1622 
Adds new drivers:
1623 
	- User-contributed drivers for Bellcore MGR (a window manager most
1624 
commonly used with OS-9) devices.
1625 
	- A user-contributed driver for the CIF file format.
1626 
	- A user-contributed driver for the HP 2563B line printer.
1627 
 
1628 
Changes the LaserJet 2p, 3, and 4 drivers so they set the initial position
1629 
to (0,0) rather than (0,0.25").  (I don't remember why it was the other
1630 
way.)
1631 
 
1632 
Implements the PageCount property in all drivers, not just printer
1633 
drivers.
1634 
 
1635 
Introduces a new gx_tile_bitmap type, and changes the tile_rectangle
1636 
device procedure to take it in place of gx_bitmap.  THIS IS A
1637 
NON-BACKWARD-COMPATIBLE CHANGE.  However, it only affects devices that
1638 
implement their own tile_rectangle procedures, of which there aren't very
1639 
many.
1640 
 
1641 
</pre><h3><a name="V2.9b_Platforms"></a>Platforms</h3><pre>
1642 
Fixes bugs:
1643 
	- The VMS module lists referred to SDCTD and SDCTE instead of
1644 
SDCT.
1645 
	- The Unix install script tried to install the non-existent file
1646 
readme.doc.
1647 
	- Microsoft C does something bizarre with empty macro parameters,
1648 
which caused a problem with the gs_struct_type_... macros.
1649 
	- The Unix platforms didn't automatically handle the presence
1650 
or absence of &lt;dirent.h&gt;.
1651 
	- The DEC Alpha OSF/1 1.3 library lacks `const' in the prototype
1652 
for popen, which requires a workaround.
1653 
	- The DEC Alpha OSF/1 1.3 X Windows library uses `private' as a
1654 
member name.
1655 
 
1656 
Splits off gp_unifs.c, containing code common to "Unix-like" file systems.
1657 
 
1658 
Adds a user-contributed OS-9 platform.
1659 
 
1660 
</pre><h3><a name="V2.9b_Interpreter"></a>Interpreter</h3><pre>
1661 
Fixes bugs:
1662 
	- The currentfile cache wasn't updated properly if an executable
1663 
file appeared in the middle of a procedure.  In particular, eexec-encoded
1664 
.PFB fonts often didn't work.
1665 
	- There was an extraneous `goto top' in scfd.c.
1666 
	- An integer constant overflowed in iname.c.
1667 
	- -2147483648 (i.e., -1 &lt;&lt; 31) was converted to a float.
1668 
	- eexec didn't skip the first 4 characters correctly if they were
1669 
split across a buffer boundary.
1670 
	- The font/matrix pair cache didn't properly free entries with only
1671 
an XUID that was being deallocated.
1672 
 
1673 
Implements additional Level 2 features:
1674 
	- Patterns, makepattern, setpattern.
1675 
	- IODevice resource, setdevparams, currentdevparams.
1676 
	- OutputDevice resource, setpagedevice, currentpagedevice.
1677 
	(Partially implemented.)
1678 
 
1679 
Adds a new type t_struct to handle miscellaneous types that are allocated
1680 
as objects and that the interpreter doesn't handle specially, and changes
1681 
condition, fontID, gstate, lock, and save types to use t_struct.  (This is
1682 
an internal change, not visible at the language level.)
1683 
 
1684 
Moves the maxlength of a dictionary to its own ref, eliminating the "size
1685 
of integer" hack.  (This is an internal change, not visible at the
1686 
language level.)
1687 
 
1688 
Adds the last OS error number to the error printout.
1689 
 
1690 
Removes the obsolete framedevice operator.
1691 
 
1692 
Implements resetfile (the only Level 1 operator not yet implemented!).
1693 
 
1694 
Changes the name of the getdevice operator to .getdevice.
1695 
 
1696 
</pre><h3><a name="V2.9b_Library"></a>Library</h3><pre>
1697 
Fixes bugs:
1698 
	- A couple of necessary casts from char * to byte * were omitted.
1699 
	- A Sun compiler required an extra cast to (void *) in the e1
1700 
macro in clip_rect_enum_ptrs in gxcpath.c.
1701 
	- The gx_dc_ procedures defined in gxdraw.c weren't marked as
1702 
'private'.
1703 
	- The number of "on" pixels in a halftone cell sometimes varied by
1704 
1 from cell to cell.
1705 
	- Mapping a gray level to CMYK didn't subtract it from 1 (to
1706 
produce the K component).
1707 
*	- charpath took hints into account.
1708 
 
1709 
Shuffles the order of some declarations to pacify the VMS C compiler.
1710 
 
1711 
</pre>
1712 
 
1713 
<hr>
1714 
 
1715 
<h2><a name="Version2.8b"></a>Version 2.8-beta (11/10/93)</h2>
1716 
 
1717 
<p>This version was distributed only to beta testers.  It adds Type 0
1718 
font
1719 
support.  It also includes extensive redesign of streams (to eventually
1720 
support procedure streams) and device properties (to eventually support
1721 
get/setpagedevice and get/setdevparams).
1722 
 
1723 
<h3><a name="V2.8b_Documentation"></a>Documentation</h3>
1724 
 
1725 
<pre>
1726 
Notes the change in X11 foreground/background handling.
1727 
 
1728 
Changes README so it no longer claims that Ghostscript works with X11R3.
1729 
 
1730 
Notes (in devs.mak) that the cdjmono driver is the best one to use for the
1731 
DeskJet 510.
1732 
 
1733 
</pre><h3><a name="V2.8b_Procedures"></a>Procedures</h3><pre>
1734 
Fixes bugs:
1735 
	- echogs wasn't always invoked with ./ on Unix systems.
1736 
 
1737 
Changes the file name unix-ansi.mak to unixansi.mak, so it can be created
1738 
on a MS-DOS system.
1739 
 
1740 
Adds a new "feature", ccinit.dev, which compiles and links the
1741 
initialization files (gs_*.ps) into the executable, just as ccfonts.dev
1742 
compiles and links fonts.  If ccinit and ccfonts are both selected, the
1743 
only external file needed at run time is Fontmap.  Note that you must have
1744 
a working version of Ghostscript already in order to create a version that
1745 
uses the ccinit feature, just as for ccfonts.
1746 
 
1747 
</pre><h3><a name="V2.8b_Utilities"></a>Utilities</h3><pre>
1748 
Fixes bugs:
1749 
	- the ps2image utility didn't put a %! on the first line of the
1750 
output.
1751 
 
1752 
</pre><h3><a name="V2.8b_Drivers"></a>Drivers</h3><pre>
1753 
Fixes bugs:
1754 
	- The Hercules display driver didn't include definitions for
1755 
outport2 and PAGE_HEIGHT_INCHES, which it uses.
1756 
	- The BGI driver didn't call setactivepage or setvisualpage,
1757 
which it needs to do in general.
1758 
	- The Apple DMP driver declared dmp_print_page rather than
1759 
appledmp_print_page, causing a compilation error.
1760 
 
1761 
Changes the X11 driver so that it doesn't use the default foreground and
1762 
background colors: you must set foreground and background explicitly for
1763 
Ghostscript if you want them to be other than black and white
1764 
respectively.
1765 
 
1766 
Adds new user-contributed drivers for:
1767 
	- The StarJet 48 inkjet printer;
1768 
	- The Linux VGALIB display interface.
1769 
	- OS/2 Presentation Manager.
1770 
 
1771 
Changes the margins of the Epson driver to 0.2, 0.0, 0.0, 0.0, which
1772 
more accurately reflect the printer's capabilities.
1773 
 
1774 
Changes the get_props and put_props device procedures to take property
1775 
list "objects" with a procedural interface, rather than a data structure
1776 
interface.  THIS IS A NON-BACKWARD-COMPATIBLE CHANGE.  It affects all
1777 
get_props and put_props procedures.  Fortunately, there were only a few
1778 
devices that implemented their own get_props and put_props procedures (the
1779 
H-P color printers, and the three window systems -- X Windows, MS Windows,
1780 
and OS/2 PM).
1781 
 
1782 
</pre><h3><a name="V2.8b_Platforms"></a>Platforms</h3><pre>
1783 
Fixes bugs:
1784 
	- The meaning of the -p switch for the Watcom compile-and-link
1785 
program was changed between Watcom C/386 versions 8.5 and 9.5, causing the
1786 
make process to malfunction.
1787 
	- The SCFTAB and SCFDTAB modules were omitted from the VMS link
1788 
list.
1789 
 
1790 
Adds user-contributed code for OS/2.
1791 
 
1792 
Removes the assumption that an 80486 CPU implies the presence of hardware
1793 
floating point, since the 486SX and Cyrix 486SLC don't have it.
1794 
 
1795 
</pre><h3><a name="V2.8b_Fonts"></a>Fonts</h3><pre>
1796 
Fixes bugs:
1797 
*	- The GS_FONTPATH scanner didn't recognize .PFB fonts beginning
1798 
with %!PS-AdobeFont.
1799 
*	- The GS_FONTPATH scanner often didn't recognize .PFB fonts at all.
1800 
	- Type 1 fonts always set the line join, line cap, and miter limit
1801 
to known values, rather than using the current values.  (Using the current
1802 
values doesn't make much sense, but it's apparently what the Adobe
1803 
implementations do.)
1804 
	- DISKFONTS didn't work, because of the change in the Ghostscript
1805 
fonts to do a systemdict begin/end (in version 2.7.1).
1806 
 
1807 
</pre><h3><a name="V2.8b_Interpreter"></a>Interpreter</h3><pre>
1808 
Fixes bugs:
1809 
	- == didn't produce exactly the same output as the Adobe
1810 
interpreters.  (Some automated debugging and testing programs care.)
1811 
	- The CCITTFaxEncode filter could get caught in an infinite loop,
1812 
because it failed to mask a byte datum when scanning for runs of black
1813 
pixels.
1814 
	- The write operator gave an error for values outside the range 0
1815 
to 255, rather than just using the low-order 8 bits.
1816 
	- Some applications call a statusdict procedure named
1817 
setresolution without checking first whether it is present; Ghostscript
1818 
didn't provide one.
1819 
	- Reading from a closed stream caused an error instead of
1820 
returning EOF.
1821 
	- Input streams didn't close automatically at EOF.
1822 
	- findfont was defined as an operator, not a procedure.
1823 
	- closefile on a closed file gave an error.  (It isn't obvious
1824 
that the Adobe documentation specifies that it shouldn't, but that's what
1825 
Adobe says they do.)
1826 
	- The LZWDecode filter didn't handle codes representing strings
1827 
longer than the buffer size correctly.
1828 
	- The LZWDecode filter only allowed 4095 codes to be used, rather
1829 
than 4096.
1830 
	- The rand operator produced an infinite string of zeros if
1831 
given 0 or 0x7fffffff as the seed.
1832 
	- When a CDevProc procedure was called, there was an extra
1833 
copy of the character name on the operand stack below the operands of
1834 
CDevProc.
1835 
 
1836 
Replaces all stream implementations with new ones designed to allow
1837 
interruption at arbitrary times.  ****** The 2-D case of CCITTFaxEncode
1838 
hasn't been converted (but it probably didn't work before, either).
1839 
 
1840 
Implements additional Level 2 features:
1841 
	- Type 0 (composite) fonts.
1842 
 
1843 
Adds an eexecEncode filter.
1844 
 
1845 
Implements setcolorscreen, which was accidentally omitted from 2.7.
1846 
 
1847 
</pre><h3><a name="V2.8b_Library"></a>Library</h3><pre>
1848 
Fixes bugs:
1849 
*	- In colorimage, if the color space of the image was different
1850 
from the current color space, and the first data values on a scan line
1851 
were zeros, the wrong color could result.
1852 
	- The new flatness testing algorithm could overflow, producing
1853 
straight lines or obvious polygons instead of curves.
1854 
	- Images could fail to display pixels after the first non-blank
1855 
pixel on a line if halftoned color was required.  (This bug was probably
1856 
introduced in 2.7.)
1857 
	- Interpolation between transfer map entries didn't work, because
1858 
of a rounding/truncation bug in frac2bits (bug introduced in 2.7.1.)
1859 
	- cshow did an extra grestore at the end.
1860 
 
1861 
* Implements a hack to slightly displace 1-bit-wide or -high images.  This
1862 
is necessary to work around a bug in TeX (or dvips?), which uses such
1863 
images to draw horizontal and vertical lines without positioning them to
1864 
ensure that they cover device pixel centers.
1865 
 
1866 
Adds support for composite fonts (no new client procedures).
1867 
 
1868 
</pre>
1869 
 
1870 
<hr>
1871 
 
1872 
<h2><a name="Version2.7.2b"></a>Version 2.7.2-beta (10/11/93)</h2>
1873 
 
1874 
<p>This version was distributed only to alpha testers.
1875 
 
1876 
<h3><a name="V2.7.2b_Utilities"></a>Utilities</h3><pre>
1877 
Fixes bugs:
1878 
	- prfont.ps didn't print unencoded characters.
1879 
 
1880 
Improves mergeini.ps to remove embedded comments.
1881 
 
1882 
</pre><h3><a name="V2.7.2b_Interpreter"></a>Interpreter</h3><pre>
1883 
Fixes bugs:
1884 
	- An error occurring within the scope of an internal .stopped
1885 
didn't pop the command and error name off the stack.
1886 
*	- The = and == procedures weren't re-entrant.
1887 
 
1888 
* Adds a .writecvs operator that does a cvs to an internal string followed
1889 
by a writestring.
1890 
 
1891 
</pre><h3><a name="V2.7.2b_Library"></a>Library</h3><pre>
1892 
Fixes bugs:
1893 
	- grestore freed the path and the clip path in an order that
1894 
was likely to lead to memory sandbars.
1895 
	- moveto + closepath didn't actually close the path.
1896 
	- moveto + reversepath produced an empty path (no moveto).
1897 
	- moveto + closepath + reversepath produced an extra lineto.
1898 
	- reversepath didn't set the current point to the end (i.e., the
1899 
former beginning) of the last subpath.
1900 
 
1901 
Adds a "planar" memory device.
1902 
 
1903 
</pre>
1904 
 
1905 
<h2><a name="Version2.7.1b"></a>Version 2.7.1-beta (10/4/93, not distributed to the public)</h2>
1906 
 
1907 
<p>Like 2.7, this version was created to satisfy a contractual
1908 
requirement,
1909 
and will never be distributed to anyone other than the other party to the
1910 
contract.
1911 
 
1912 
<h3><a name="V2.7.1b_Documentation"></a>Documentation</h3><pre>
1913 
Documents the GS_OPTIONS environment variable.
1914 
 
1915 
Adds a summary of all environment variables to the documentation
1916 
(use.doc).
1917 
 
1918 
Documents the existence of a third free viewer built on Ghostscript.
1919 
 
1920 
</pre><h3><a name="V2.7.1b_Utilities"></a>Utilities</h3><pre>
1921 
Fixes bugs:
1922 
	- wrfont didn't wrap a systemdict begin / end around the body of
1923 
the font.
1924 
	- wrfont wrote out the Symbol and ZapfDingbats encodings in a way
1925 
that only worked if the encoding was known by name.
1926 
 
1927 
Changes bdftops to include an XUID if desired.
1928 
 
1929 
Changes bdftops so that it uses 'show' for unknown ligatures, rather than
1930 
executing the characters as subroutines; this makes such ligatures work
1931 
properly with xfonts.
1932 
 
1933 
</pre><h3><a name="V2.7.1b_Drivers"></a>Drivers</h3><pre>
1934 
Fixes bugs:
1935 
	- The PCL drivers sent a printer reset (&lt;ESC&gt;E) at the beginning
1936 
of every page, instead of only before the first page.
1937 
	- The PCX driver didn't round up the scan line width in the
1938 
header, even though it produced scan lines with the correct (rounded)
1939 
number of bytes.
1940 
 
1941 
Adds a new map_rgb_alpha_color procedure.  This is a backward-compatible
1942 
change; this procedure defaults to calling map_rgb_color.
1943 
 
1944 
</pre><h3><a name="V2.7.1b_Platforms"></a>Platforms</h3><pre>
1945 
Fixes bugs:
1946 
	- On Unix platforms, the value of the TEMP environment variable
1947 
had to end with a '/'.
1948 
	- On MS-DOS systems, printer output to devices other than PRN
1949 
(specifically, LPTn) didn't put the device into binary mode.
1950 
 
1951 
Adds FPU_TYPE to the Unix makefiles, with a default value of 1.
1952 
 
1953 
Removes the mention of Xmu linking problems on the SunOS platform,
1954 
since the problem no longer exists.
1955 
 
1956 
Changes the order of X Windows libraries from Xt X11 Xext to Xt Xext X11.
1957 
This makes the OSF/1 linker happier.
1958 
 
1959 
</pre><h3><a name="V2.7.1b_Fonts"></a>Fonts</h3><pre>
1960 
Fixes bugs:
1961 
	- All the fonts originated by Aladdin, and the shareware fonts,
1962 
had UniqueIDs in the 4xxxxxx range, which is only supposed to be used for
1963 
limited-distribution fonts.
1964 
*	- When Ghostscript loaded a font, it pushed a scratch dictionary
1965 
on the dictionary stack, rather than userdict.  (Note that this fix also
1966 
requires fixing the fonts to include a protective systemdict begin /
1967 
end; see below.)
1968 
*	- When loading a font failed, Ghostscript didn't check the font
1969 
name against the default font name properly.
1970 
	- Ghostscript's own fonts didn't include a systemdict begin /
1971 
end to guard against redefinition of names used in the reading
1972 
procedures (e.g., index).
1973 
*	- When Ghostscript scanned a .PFB font to get the FontName, it
1974 
didn't skip over the 6-byte header, which could cause confusion or a
1975 
syntaxerror.
1976 
	- Loading a .PFB font that left extra information on the
1977 
operand stack didn't work.
1978 
 
1979 
Changes the ZapfDingbats font to use DingbatsEncoding rather than include
1980 
a copy of the encoding in itself, if DingbatsEncoding is known.  Changes
1981 
the Symbol font similarly.
1982 
 
1983 
Removes eexec encryption from the 4 URW fonts, so they will work with
1984 
DISKFONTS.
1985 
 
1986 
Adds shareware Hiragana and Katakana fonts (Calligraphic-Hiragana and
1987 
Calligraphic-Katakana, by Kevin Hartig).
1988 
 
1989 
Adds GS on the end of the family names of all of Aladdin's own converted
1990 
fonts.
1991 
 
1992 
Replaces many of the Hershey fonts with new ones (mostly Type 1) created
1993 
by Thomas Wolff, who added accents, accented characters, and other
1994 
non-alphabetics.  These too now have proper UniqueIDs.
1995 
 
1996 
</pre><h3><a name="V2.7.1b_Interpreter"></a>Interpreter</h3><pre>
1997 
Fixes bugs:
1998 
*	- imagemask interpreted the Decode array incorrectly (inverted).
1999 
	- Running out of memory when constructing a path incorrectly
2000 
signalled a limitcheck rather than a VMerror.
2001 
	- restore didn't purge uncached scaled fonts properly.
2002 
 
2003 
Adds alpha (opacity) to the graphics state, and setalpha and
2004 
currentalpha operators.
2005 
 
2006 
Redefines erasepage in terms of a new .fillpage operator that fills
2007 
the current page with the current color and then does a sync_output.
2008 
 
2009 
Redefines setdevice and putdeviceprops in terms of new .setdevice and
2010 
.putdeviceprops operators that return a boolean indicating whether the
2011 
page needs to be erased.  With this change, operators that erase the page
2012 
always call erasepage at the interpreter level rather than calling
2013 
gs_erasepage directly.
2014 
 
2015 
</pre><h3><a name="V2.7.1b_Library"></a>Library</h3><pre>
2016 
Fixes bugs:
2017 
	- The null device allowed its size to be reset.
2018 
	- clippath didn't establish a current point if the clipping
2019 
path was empty.
2020 
*	- The Type 1 font interpreter (gs_type1_interpret) flattened
2021 
curves even if it was being invoked for charpath.
2022 
	- Colored halftones usually didn't come out with the correct
2023 
phase, and had several other problems.
2024 
	- A show or charpath within a BuildChar procedure didn't work.
2025 
	- Accented characters composed with seac used the base
2026 
character width instead of the composed character width.  (The Adobe
2027 
documentation says these must be the same, but some commercial fonts
2028 
don't obey this.)
2029 
	- setcurrentpoint in the accent of a character composed with
2030 
seac didn't take the accent's displacement into account.
2031 
 
2032 
Adds an alpha (coverage) value to the graphics state, and
2033 
gs_setalpha/currentalpha procedures.  Currently Ghostscript just passes
2034 
the alpha value to the driver; it doesn't attempt to emulate alpha
2035 
handling if the driver doesn't support it.
2036 
 
2037 
Redefines gs_erasepage to call gs_fillpage.
2038 
 
2039 
Bypasses the fill code if the clipping box is empty.  This makes a big
2040 
difference for stringwidth, and doesn't hurt anything else.
2041 
 
2042 
Changes frac_1 from 0x7fff to 0x7ff8.  This allows exact representation of
2043 
practically all useful fractions, since this number (32760) is
2044 
2*2*2*3*3*5*7*13.
2045 
 
2046 
Changes float to double in several matrix routines for better accuracy.
2047 
 
2048 
Adds new device properties to implement the deviceinfo operator:
2049 
Colors, GrayValues, RedValues, GreenValues, BlueValues, ColorValues.
2050 
Also adds HWBitsPerPixel and HWColorMap.
2051 
 
2052 
Changes the sorting algorithm for halftones to use qsort instead of
2053 
special code.
2054 
 
2055 
Changes the Type 1 interpreter so that it uses the current point, rather
2056 
than (0,0), as the character origin.
2057 
 
2058 
</pre>
2059 
 
2060 
<h2><a name="Version2.7b"></a>Version 2.7-beta (9/20/93, not distributed to the public)</h2>
2061 
 
2062 
<p>This is the first of a series of beta-only versions planned for
2063 
release
2064 
between 2.6.n and 3.0.  This version, in particular, was created to
2065 
satisfy a contractual requirement, and will never be distributed to anyone
2066 
other than the other party to the contract.
2067 
 
2068 
<h3><a name="V2.7b_Documentation"></a>Documentation</h3><pre>
2069 
Fixes bugs:
2070 
	- The "HP XLFD extensions" to X11R5 are not specific to H-P
2071 
platforms.
2072 
	- The configuration generation script used rm rather than rm -f.
2073 
	- gs.1 was installed in $(docdir) rather than $(mandir);
2074 
$(mandir) wasn't defined.
2075 
	- ansi2knr.1 was installed in $(docdir), which was
2076 
inappropriate because ansi2knr itself wasn't installed anywhere.
2077 
 
2078 
Moves documentation for versions 2.4.x and 2.5.x to history.doc.
2079 
 
2080 
Moves the documentation on how to add devices to the configuration
2081 
from devs.mak to make.doc.
2082 
 
2083 
Changes the name of readme.doc to current.doc, since the presence of
2084 
two "readme" files was confusing to users.
2085 
 
2086 
Documents how to use the Microsoft Windows PostScript printer driver
2087 
to convert TrueType fonts to Type 1 fonts embedded in the document.
2088 
 
2089 
Corrects several errors in the documentation of the get_bits driver
2090 
procedure.
2091 
 
2092 
Documents the fact that X11R3 is no longer supported.
2093 
 
2094 
Removes the last references to "Ghostscript" from the comments in the
2095 
gs_*.ps files.  The only remaining reference, other than the boilerplate
2096 
comments at the beginning of each file, is in the message at the end of
2097 
gs_init.ps.
2098 
 
2099 
Documents the use of WMAKEL rather than WMAKE with the Watcom compiler.
2100 
 
2101 
</pre><h3><a name="V2.7b_Procedures"></a>Procedures</h3><pre>
2102 
Fixes bugs:
2103 
*	- The Unix install script used gs rather than $(GS) as the name of
2104 
the executable.
2105 
*	- The Unix install script didn't copy gs_dbt_e.ps to $(gsdatadir).
2106 
	- genconf.c used ps2 as a variable name; ps2 is a predefined
2107 
preprocessor symbol in the VSC compiler used by IBM.
2108 
	- @-expansion didn't interact properly with -- and -+.
2109 
	- The Unix install script didn't copy COPYING to $(docdir),
2110 
and copied README to $(gsdatadir) rather than $(docdir).
2111 
	- ps2ascii used /bin/sh -f, which is an incorrect flag.
2112 
 
2113 
Removes all uses and mentions of USG (a now-obsolete GNU convention)
2114 
as a synonym for SYSV.
2115 
 
2116 
Removes filter.dev and dps.dev from FEATURE_DEVS if level2.dev is
2117 
included, since they don't add anything beyond level2.dev.
2118 
 
2119 
Changes the ccgs script to explictly remove the old .o file before
2120 
doing the mv, for the benefit of people who have changed mv to prompt
2121 
before overwriting.  Changes the configuration script to use rm -f
2122 
for the same reason.
2123 
 
2124 
Changes the -Z switch so an empty list of options does nothing, rather
2125 
than turning on all options.
2126 
 
2127 
Adds a -@ switch which is like -- and -+ except that it does
2128 
@-expansion of arguments.
2129 
 
2130 
Changes genconf so it takes patterns from the command line that describe
2131 
how to write the linker control files, rather than having the patterns
2132 
built in.
2133 
 
2134 
Changes -d and -D so that if no value is supplied, the default is
2135 
true rather than null.
2136 
 
2137 
</pre><h3><a name="V2.7b_Utilities"></a>Utilities</h3><pre>
2138 
Fixes bugs:
2139 
*	- The ps2ascii script still referenced ps2ascii.ps under its
2140 
old name gs_2asc.ps.
2141 
*	- ps2image.ps had a 'pop' missing in the written-out
2142 
definition of 'max' in the boilerplate code it put at the beginning
2143 
of compressed files.
2144 
*	- ps2image.ps got a typecheck if a scan line had no repeated
2145 
data in it anywhere.
2146 
	- wrfont.ps didn't handle CharStrings or Subrs that weren't
2147 
strings.
2148 
	- mergeini.ps produced an init file that incorrectly
2149 
attempted to load the Symbol and Dingbats encodings dynamically.
2150 
 
2151 
Removes the gsview.bat file, since it was confusingly named and not
2152 
generally useful.
2153 
 
2154 
Changes bdftops back to using encrypted CharStrings, for compatibility
2155 
with Adobe interpreters, but also changes lenIV to 0, to save a little
2156 
more space.
2157 
 
2158 
Changes the traceop utility so it makes traced operators appear to be
2159 
operators, and so it will replace a definition in systemdict if explicitly
2160 
requested to do so and systemdict is writable.
2161 
 
2162 
Adds a printafm utility for printing the metrics of fonts in AFM format.
2163 
 
2164 
</pre><h3><a name="V2.7b_Drivers"></a>Drivers</h3><pre>
2165 
Fixes bugs:
2166 
	- The cdj driver was missing a few type casts that were needed to
2167 
satisfy pedantic compilers.
2168 
	- For banded devices, many of the non-displaying target routines
2169 
were getting called with the original device as the first argument, not
2170 
the target device.  (This didn't make any difference in practice, because
2171 
gdev_prn_open explicitly copied the non-rendering procedures back into the
2172 
procedure vector.)
2173 
*	- The X driver didn't catch and discard bogus errors on
2174 
XFreeColors, which faulty servers generate.
2175 
*	- The X driver gave up on color allocation too easily.
2176 
*	- The X driver dynamic color table size could become negative.
2177 
*	- x_lookup_font could return platform fonts of very small sizes,
2178 
which have very inaccurate metrics.
2179 
*	- The ESCP/2 driver was incorrectly named gdevescp2 in devs.mak.
2180 
	- The Apple DMP driver used #if 0 / #endif instead of comment
2181 
brackets, and was incorrectly named "dmp" instead of "appledmp" in
2182 
the source code.
2183 
*	- The X driver didn't free dynamic colors at the start of each page.
2184 
*	- The X driver didn't bind foreground/background defaults tightly.
2185 
*	- The X driver didn't check for GHOSTVIEW_COLORS properly.
2186 
*	- The X driver freed too many colors if an allocation request failed.
2187 
*	- The X driver didn't check return value of gs_malloc for being NULL.
2188 
*	- The DeskJet/LaserJet driver used an incorrect command for
2189 
end-of-page.
2190 
*	- The DeskJet/LaserJet driver incorrectly reset the printer at the
2191 
beginning of every page.
2192 
*	- The PCX driver put an old version number in the header, and
2193 
didn't pad scan lines to an even number of bytes.
2194 
	- The BMP driver used a variable named `quad', which is a
2195 
reserved word on some platforms.
2196 
*	- The TIFF driver didn't handle A4 or B4 size paper correctly.
2197 
*	- The X11 driver incorrectly demanded the Xmu library, which was
2198 
not needed and which caused link errors on some versions of SunOS.
2199 
*	- X11 font matching scheme was too loose, causing overlaps and
2200 
other problems.
2201 
*	- X11 Font Extensions (rotated and mirrored fonts) did not work
2202 
properly on NCD terminals.
2203 
*	- When freeing the rgb cube/gray ramp, the parameters to gs_free()
2204 
did not exactly match the parameters to gs_malloc().
2205 
*	- Ghostscript failed to warn the user when it could not allocate
2206 
the original color cube/gray ramp and dropped back to a smaller
2207 
cube/ramp, or from color to mono.
2208 
*	- x_release could cause Ghostscript to fail if a font was freed
2209 
after the device was closed.
2210 
	- The X driver continued to ask the server for colors even after a
2211 
request failed, causing colored images to display very slowly.
2212 
 
2213 
* Adds a pcxgray driver to provide 8-bit gray scale output in PCX format.
2214 
 
2215 
Adds a pcx24b driver to provide 24-bit RGB color PCX output.
2216 
 
2217 
* Adds a LaserJet 4 driver.
2218 
 
2219 
Adds a user-contributed driver for the DEC LA70 (very similar to the LA75).
2220 
 
2221 
Substantially improves the performance of the PxM drivers by eliminating
2222 
an unnecessary copying step and by writing each scan line with a single
2223 
fwrite when possible.
2224 
 
2225 
Moves the gray-scale and 24-bit RGB device color mapping routines to
2226 
gxcmap.c from gdevpcx.c and (nowhere).
2227 
 
2228 
Allows window granularities smaller than 64K in the VESA driver.
2229 
 
2230 
Changes the LaserJet margins again.
2231 
 
2232 
</pre><h3><a name="V2.7b_Platforms"></a>Platforms</h3><pre>
2233 
Fixes bugs:
2234 
	- Platforms where stat doesn't return a st_blocks value
2235 
computed the block count wrong.
2236 
	- In gp_vms.c, the call on SYS$FILESCAN needed two uint *s
2237 
rather than a long * and a struct *.
2238 
*	- The VMS script files referenced IBSCAN instead of ISCAN2,
2239 
and omitted GDEVXXF.
2240 
*	- The UUENCODEd icons for the MS Windows platform were omitted
2241 
from the fileset.
2242 
*	- On MS-DOS systems, filenameforall didn't interpret * alone
2243 
as a pattern matching all files.
2244 
 
2245 
Adds wildcard matching capability to filenameforall under Unix.
2246 
 
2247 
Removes gp_file_status from the platform interface, since all
2248 
platforms provide identical stat calls in the C library.
2249 
 
2250 
Adds DesqView/X (using djgcc and go32) as a platform.
2251 
 
2252 
Removes the S3 driver from the standard PC configurations.
2253 
 
2254 
Adds documentation for compiling Ghostscript on the Intergraph Clipper.
2255 
 
2256 
Updates the documentation to add a better list of X Windows font
2257 
names for the Sun platform.
2258 
 
2259 
</pre><h3><a name="V2.7b_Fonts"></a>Fonts</h3><pre>
2260 
 
2261 
Creates an external file (gs_dbt_e.ps) with the ZapfDingbats encoding
2262 
(actually in 2.6.1, but not documented there).
2263 
 
2264 
Changes the names of the Cyrillic fonts to Shareware-Cyrillic-Regular
2265 
and Shareware-Cyrillic-Italic, keeping Cyrillic, Cyrillic-Regular,
2266 
and Cyrillic-Italic as aliases.
2267 
 
2268 
* Removes the requirement that the FontName in the font file be the same
2269 
as the name in Fontmap.  (This requirement led to the need for aliases,
2270 
and was extremely confusing to users.)
2271 
 
2272 
* Adds a GS_FONTPATH environment variable containing a list of directories
2273 
that should be scanned automatically for fonts.
2274 
 
2275 
* Gets rid of the Ugly font, and changes the default to the IBM Courier
2276 
font, which is freely distributable.
2277 
 
2278 
</pre><h3><a name="V2.7b_Interpreter"></a>Interpreter</h3><pre>
2279 
Fixes bugs:
2280 
	- cvs didn't check for stack underflow.
2281 
*	- zht2.c didn't include alloc.h.
2282 
*	- execstackoverflow cleared the e-stack instead of just
2283 
cutting it back.
2284 
	- if and ifelse incorrectly reported typecheck instead of
2285 
stackunderflow.
2286 
	- Copying a dictionary could alter some items even if a later
2287 
item causes an invalidaccess error because of an attempted store of a
2288 
local object into global VM.
2289 
	- bitshift and cvrs assumed that longs occupied 32 bits.
2290 
*	- exitserver didn't check the password, and always succeeded.
2291 
	- Font loading didn't suppress all output messages if QUIET
2292 
was set.
2293 
*	- The interpreter incorrectly pushed its exit procedure on
2294 
the e-stack if it was called again after an interrupt.
2295 
*	- The interpreter didn't treat timeout like interrupt in
2296 
terms of re-executing the current operation.
2297 
*	- `show' operators popped their operands before they were
2298 
sure they wouldn't be interrupted.
2299 
*	- rotate with a matrix operand didn't check for multiples of
2300 
90 degrees.
2301 
	- In the system name table, ge was misspelled eg, and
2302 
pathforall was misspelled pathfoall.
2303 
*	- file_close_file attempted to free the buffer even if it was an
2304 
externally supplied string (specifically, the argument of gs_run_string).
2305 
	- setprintername (in gs_statd.ps) set printername rather than
2306 
.printername.
2307 
 
2308 
Implements additional Level 2 features:
2309 
	- Indexed color space with lookup procedure.
2310 
	- sethalftone, except for the transfer function override,
2311 
	and currenthalftone.
2312 
 
2313 
Implements OtherSubrs for indices greater than 3 (required for
2314 
MultiMaster fonts).
2315 
 
2316 
Implements black generation and undercolor removal.
2317 
 
2318 
Changes `store' from a C procedure to a PostScript procedure.
2319 
 
2320 
Changes idiv back so it requires integer operands, per the Adobe
2321 
documentation but not per some old Adobe interpreters.
2322 
 
2323 
* Adds many new paper sizes to gs_statd.ps.  It now includes ISO a0-a10
2324 
and b0-b10, and CAD sizes archA-archE.
2325 
 
2326 
Implements `status' for non-%os% files.  (This is currently a no-op,
2327 
but the framework is there.)
2328 
 
2329 
Changes the error handler so it normally uses = rather than == to print
2330 
the operand stack, to avoid recursive errors.
2331 
 
2332 
* Adds time slicing capability to the interpreter.
2333 
 
2334 
Implements setcolorscreen/currentcolorscreen.
2335 
 
2336 
</pre><h3><a name="V2.7b_Library"></a>Library</h3><pre>
2337 
Fixes bugs:
2338 
*	- Rectangles with vertices specified in clockwise order were
2339 
drawn as 0-width lines.
2340 
*	- The string matching function reported that 'abcdefg'
2341 
matched the pattern 'abcde'.
2342 
*	- The bounding box of non-rectangular clipping paths was not
2343 
being marked as valid, so cached characters would simply get
2344 
discarded as being outside the bounding box.
2345 
	- erasepage filled the page with the device's white color,
2346 
not with gray level 1 passed through the transfer function.
2347 
*	- Colors with equal R/G/B or C/M/Y components were rendered
2348 
incorrectly if the 3 or 4 transfer functions were not all the same.
2349 
*	- Because of a bug in rc_unshare, using CIE color would give
2350 
random errors (such as /invalidaccess in --for--).
2351 
*	- setbbox didn't round the coordinates properly, which could
2352 
cause erroneous rangecheck errors with coordinates on the edge of the
2353 
box.
2354 
*	- Color halftones "flipped over" at the 50% point, inverting
2355 
foreground and background.
2356 
	- Quite a few places assumed that longs occupied 32 bits.
2357 
*	- kshow passed an incorrect c1 value to the procedure.
2358 
	- The debugging code in update_x_list in gxfill.c didn't take
2359 
into account the possibility that the active line at x_first might be
2360 
deleted.
2361 
	- gx_image_cached_char called the xfont render_char procedure an
2362 
extra time if it failed with required=0 and succeeded with required=1.
2363 
(This was just a small inefficiency, not a logic bug.)
2364 
	- Non-rectangular clipping regions weren't computed correctly,
2365 
because accum_add_rect didn't handle overlapping rectangles.
2366 
	- Drivers didn't report file system errors (such as file system
2367 
full) as an ioerror.
2368 
*	- setdevice didn't reset the charpath and setcachedevice flags.
2369 
	- The Zortech compiler produced wrong code for the uid_equal
2370 
macro; uid_equal is now a procedure.
2371 
 
2372 
Passes OtherSubrs arguments back to the caller correctly for indices
2373 
greater than 3.
2374 
 
2375 
Implements black generation and undercolor removal.
2376 
 
2377 
Removes gdev_mem_ensure_byte_order, which was no longer used or useful.
2378 
 
2379 
Removes gstdev.c (device tracing), since it hasn't been used in a
2380 
long time and is of little value given a reasonable debugger.
2381 
 
2382 
Changes the interface to the xfont char_metrics and render_char
2383 
procedures to allow them to return 1.
2384 
 
2385 
Changes 32-bit memory devices so they use CMYK color mapping rather
2386 
than RGB mapping with an unused byte.
2387 
 
2388 
Implements gs_setcolorscreen/currentcolorscreen.
2389 
 
2390 
Implements Level 2 halftones, except for the transfer function override.
2391 
 
2392 
Implements a hack to make zero-width rectangles display as one pixel wide,
2393 
to work around a bug in the Microsoft Windows PostScript driver.
2394 
Currently the hack only works for vertical lines, not horizontal ones.
2395 
 
2396 
</pre>
2397 
 
2398 
<hr>
2399 
 
2400 
<h2><a name="Version2.6.1"></a>Version 2.6.1 (5/28/93)</h2>
2401 
 
2402 
<p>This is primarily a bug-fix release for 2.6, with a couple of minor
2403 
additions.
2404 
 
2405 
<h3><a name="V2.6.1_Documentation"></a>Documentation</h3><pre>
2406 
 
2407 
Adds proper `man' pages ansi2knr.1 and gs.1.
2408 
 
2409 
</pre><h3><a name="V2.6.1_Procedures"></a>Procedures</h3><pre>
2410 
Fixes bugs:
2411 
	- The Unix makefile produced an incorrect linker command if
2412 
EXTRALIBS was not empty.
2413 
	- The Unix install commands didn't copy devices.doc,
2414 
ps2epsi.doc, and xfonts.doc to the documentation directory.
2415 
	- echogs.c didn't include &lt;sys/types.h&gt;, which is needed for
2416 
time_t on some systems.
2417 
	- malloc_.h used &lt;malloc.h&gt; rather than &lt;stdlib.h&gt; on
2418 
NeXTStep systems.
2419 
 
2420 
Changes the configuration procedure to use a C program rather than
2421 
complex shell scripts.
2422 
 
2423 
</pre><h3><a name="V2.6.1_Utilities"></a>Utilities</h3><pre>
2424 
Fixes bugs:
2425 
	- The boilerplate produced by ps2image used the 'max'
2426 
operator, which is not a standard PostScript operator.
2427 
	- The winmaps.ps utility had 'floring' instead of 'florin' in
2428 
the OEMEncoding table.
2429 
	- quit.ps was omitted from the PC distribution.
2430 
 
2431 
Changes the name of the dicttomark procedure to .dicttomark.
2432 
 
2433 
Renames gs_2asc.ps as ps2ascii.ps, so it matches the names of the
2434 
script files.
2435 
 
2436 
</pre><h3><a name="V2.6.1_Drivers"></a>Drivers</h3><pre>
2437 
Fixes bugs:
2438 
	- The pbmraw driver was writing out RGG instead of RGB values.
2439 
	- The X11 driver used NULL in a place where it should have
2440 
used None.
2441 
	- For multi-file output, the GIF driver didn't write a header
2442 
at the beginning of each file.
2443 
	- The Epson driver didn't honor the -A4 compilation switch,
2444 
didn't put (0,0) at the physical corner of the page, and was too
2445 
liberal about using tabs instead of spaces.
2446 
 
2447 
Replaces the color handling algorithms in the X Windows driver with
2448 
new, much better ones.
2449 
 
2450 
Makes the PC display drivers recognize the -A4 compilation switch,
2451 
like the printer drivers.
2452 
 
2453 
Adds new user-contributed drivers:
2454 
	- A driver for Epson printers that use the ESC/P 2 control
2455 
language, such as the Stylus 800.
2456 
	- A driver for the Apple Dot Matrix Printer and Imagewriter.
2457 
 
2458 
Adds a new get_xfont_device driver procedure.  This is a
2459 
backward-compatible change, since there is a sensible default.
2460 
 
2461 
</pre><h3><a name="V2.6.1_Platforms"></a>Platforms</h3><pre>
2462 
Fixes bugs:
2463 
	- On VMS, gconfig.h didn't have #include "gsconfig.h" as its
2464 
first line.
2465 
	- gconfig.c compiled incorrectly on the RS/6000 because the
2466 
compiler evaluated a constant of the form (x&lt;&lt;y)+z incorrectly.
2467 
	- Quite a few files that used the mem... functions didn't
2468 
include memory_.h, which caused trouble on some bsd4.2 systems.
2469 
	- The definition of zfont_char_xglyph confused one of the AIX
2470 
compilers.
2471 
	- On VMS, DEC C allows extra arguments for fopen, but gcc doesn't.
2472 
	- On the MS Windows platform, 2.6 used gdevwddb rather than
2473 
gdevwdib; the latter is almost always faster.
2474 
	- The PC .zip files didn't include the Windows .ICO and .RES
2475 
files in either GSEXE.ZIP or GSFILES.ZIP.
2476 
 
2477 
On PC platforms, adds an option (FPU_TYPE=-1) to optimize for
2478 
machines lacking a floating point processor.
2479 
 
2480 
</pre><h3><a name="V2.6.1_Fonts"></a>Fonts</h3><pre>
2481 
 
2482 
Adds 4 new fonts contributed by URW.  These have a URW copyright and
2483 
are governed by the GNU License.
2484 
 
2485 
Documents the fact that font names in Fontmap can be strings, not
2486 
only names.
2487 
 
2488 
Adds DingbatsEncoding as a predefined encoding (in addition to
2489 
Standard, ISOLatin1, and Symbol).
2490 
 
2491 
</pre><h3><a name="V2.6.1_Interpreter"></a>Interpreter</h3><pre>
2492 
Fixes bugs:
2493 
	- memchr (used in zfile.c) isn't available on all platforms.
2494 
	- languagelevel was defined as an operator rather than an
2495 
integer.
2496 
	- iccfont.c referred to name_StandardEncoding instead of
2497 
#include'ing font.h and referring just to StandardEncoding.
2498 
	- The CCITTFaxDecode filter didn't work on 32- (or 64-) bit
2499 
machines, because of a bug in more_bits().
2500 
	- The structures recording an allocation within the scope of
2501 
a save could get allocated unnecessarily, because they weren't
2502 
properly marked as free when an array was freed.
2503 
 
2504 
Renames the following Ghostscript-specific operators by adding a '.'
2505 
at the front: makeoperator, setdebug, setmaxlength, stringmatch,
2506 
type1decrypt, type1encrypt.
2507 
 
2508 
Adds a real implementation of glyphshow.
2509 
 
2510 
</pre><h3><a name="V2.6.1_Library"></a>Library</h3><pre>
2511 
Fixes bugs:
2512 
	- Discarding fractional character coordinates in the Type 1
2513 
rasterizer led to some rendering anomalies (e.g., characters 1 pixel
2514 
too high).
2515 
	- If a font had a non-standard encoding (i.e., not
2516 
StandardEncoding, ISOLatin1Encoding, or SymbolEncoding), Ghostscript
2517 
would never invoke the platform font code.
2518 
	- The RGB to HSB color conversion algorithms produced
2519 
nonsensical values.
2520 
	- struct cached_char_s was defined redundantly in gxcdir.h,
2521 
causing compilation problems on some systems.
2522 
	- 32-bit color devices didn't work properly on little-endian
2523 
machines (arrange_bytes in gdevmem2 was wrong).
2524 
	- The scaled font cache could confuse two fonts with the same
2525 
UniqueID and different Encodings.
2526 
	- Under many common circumstances (first use of a character
2527 
was with stringwidth, the font was renamed, the font encoding was
2528 
changed), xfonts would not be used.
2529 
 
2530 
Adds gs_glyphshow.
2531 
 
2532 
</pre>
2533 
 
2534 
<h2><a name="Version2.6"></a>Version 2.6 (5/9/93)</h2>
2535 
 
2536 
<p>The main new feature in this release is the ability to use platform
2537 
fonts.  It also adds many more Level 2 PostScript facilities.
2538 
 
2539 
<h3><a name="V2.6_Documentation"></a>Documentation</h3><pre>
2540 
 
2541 
Corrects some errors in the documentation of the makeimagedevice operator.
2542 
 
2543 
Adds operand and result types to the comments at the beginning of all the
2544 
operators.
2545 
 
2546 
Adds new sections on installation in use.doc.
2547 
 
2548 
Reinstates history.doc as a repository for old and no longer interesting
2549 
history information.
2550 
 
2551 
Adds a new file, devices.doc, with documentation for specific devices.
2552 
 
2553 
Points out that font2c must be run with a Fontmap that includes the fonts
2554 
being converted, and that its arguments must be quoted with "" on VMS
2555 
systems.
2556 
 
2557 
Notes that the font name in the Fontmap must be the same as the FontName
2558 
in the font.
2559 
 
2560 
Adds a list of the Level 2 facilities not provided by Ghostscript.
2561 
 
2562 
Identifies bug-ghostscript@prep.ai.mit.edu as an alias for the
2563 
gnu.ghostscript.bug newsgroup.
2564 
 
2565 
Points out explicitly that -sOutputFile=- sends output to stdout, and
2566 
requires using the -q switch.
2567 
 
2568 
Documents the use of tar_cat to construct the Unix makefiles.
2569 
 
2570 
Adds a new file, xfonts.doc, that describes the external font interface.
2571 
 
2572 
Documents the fact that drivers must use gs_malloc and gs_free rather than
2573 
malloc and free.
2574 
 
2575 
Documents the *.sh (shell script) files.
2576 
 
2577 
Adds brief documentation on some additional development tool .ps files.
2578 
 
2579 
Documents the TEMP and GS_OPTIONS environment variable.
2580 
 
2581 
Points out the need to run Windows in 386 Enhanced mode on machines
2582 
that have less than 6 Mb of RAM.
2583 
 
2584 
Consolidates documentation on compiler switches in make.doc (some of
2585 
it had been in the unix*.mak files).
2586 
 
2587 
</pre><h3><a name="V2.6_Procedures"></a>Procedures</h3><pre>
2588 
Fixes bugs:
2589 
	- \'s in arguments following -- were doubled.
2590 
 
2591 
Includes the full set of filters automatically if the level2 feature
2592 
is selected.
2593 
 
2594 
Extends DEVICE_DEVS... up to DEVS9.  Adds DEVICE_DEVS1 as well.
2595 
 
2596 
Renames turboc.mak and tbcplus.mak as tc.mak and bc.mak.
2597 
 
2598 
Makes @-files use the library path (GS_LIB, -I).
2599 
 
2600 
Changed the Unix install script to use install &lt;file&gt; &lt;destfile&gt;
2601 
rather than install &lt;file&gt; &lt;directory&gt;.
2602 
 
2603 
Adds a GS_OPTIONS environment variable that acts like an implicit @-file
2604 
at the beginning of the command line (i.e., may contain switches and
2605 
initialization files).
2606 
 
2607 
Renames sym__enc.ps as gs_sym_e.ps.
2608 
 
2609 
Adds a user-contributed shell script for using Ghostscript with an
2610 
H-P printer spooler.
2611 
 
2612 
Adds level1.ps to the set of installed utility files.
2613 
 
2614 
Extends the TEMP environment variable (the directory for scratch
2615 
files) to work on Unix as well as MS-DOS.
2616 
 
2617 
Changes the MS Windows makefile to generate gswin.exe rather than
2618 
gs.exe, and the Watcom makefile to generate gs386.exe.
2619 
 
2620 
Moves the "product" string from gs_init.ps to iinit.c.
2621 
 
2622 
Adds a GS macro to the makefiles, to allow choosing the name of the
2623 
executable.
2624 
 
2625 
</pre><h3><a name="V2.6_Utilities"></a>Utilities</h3><pre>
2626 
Fixes bugs:
2627 
*	- font2c did the wrong thing (still) for fonts that didn't
2628 
use StandardEncoding, ISOLatin1Encoding, or SymbolEncoding.
2629 
*	- impath.ps had a fatal bug (wrong operand order for
2630 
charstack_write) that caused bdftops to fail.
2631 
	- gslp didn't wrap or truncate lines.
2632 
	- gslp didn't handle tabs in a second or subsequent column
2633 
properly.
2634 
	- The definition of ashow in gs_2asc.ps incorrectly undid the
2635 
increment following the last character.
2636 
	- The definition of awidthshow in gs_2asc.ps failed to pop
2637 
two entries from the stack, and also tested the character against the
2638 
wrong value.
2639 
 
2640 
Adds a shell script (sysvlp.sh) that interfaces Ghostscript with the
2641 
System V 3.2 lp interface.
2642 
 
2643 
Adds ps2ascii and ps2epsi script/batch files.
2644 
 
2645 
Adds a new utility, mergeini.ps, for concatenating all the
2646 
Ghostscript initialization files into a single file, optionally
2647 
removing comments and blank lines.
2648 
 
2649 
Adds new switches to gslp:
2650 
	-q: suppress all printed output.
2651 
	--detect: check whether the file begins with %!, and if so,
2652 
	    interpret it directly as a PostScript file.
2653 
	--first-page &lt;page#&gt;: replaces the former -P switch.
2654 
	--last-page &lt;page#&gt;: replaces the former -Q switch.
2655 
	--(heading|footing)-(left|center|right) &lt;string&gt;: define
2656 
	    headers/footers.  # inserts the page number.
2657 
	--margin-(top|bottom|left|right) &lt;inches&gt;: define margins.
2658 
	--spacing &lt;n&gt;: for double, triple, etc. spacing.
2659 
Also makes gslp ignore all the enscript flags it doesn't implement.
2660 
 
2661 
Adds an option to wrfont.ps to do encryption at read-in time.  (This
2662 
allows much better compression of the standard Ghostscript fonts.)
2663 
Changes bdftops to use this option.
2664 
 
2665 
Changes gslp to accept wild cards in file names.
2666 
 
2667 
Replaces landscap.ps with a new one contributed by a user.
2668 
 
2669 
Changes the compression scheme used in ps2image to a much more
2670 
effective one.  Writing images is much slower than with the previous
2671 
scheme, but reading is not.
2672 
 
2673 
</pre><h3><a name="V2.6_Platforms"></a>Platforms</h3><pre>
2674 
Fixes bugs:
2675 
	- SCFDTAB and SCFTAB were omitted from the VMS module lists.
2676 
	- Function prototypes were not being used with the Watcom
2677 
compiler.
2678 
	- On MS-DOS platforms, if the value of the TEMP variable had
2679 
a trailing : or \, Ghostscript appended a \ anyway.
2680 
	- Under Windows, changing the size or resolution of the image
2681 
closed and reopened the window.
2682 
	- Ghostscript would not build correctly with the Watcom compiler
2683 
if DOS4G=quiet was not set, because the DOS4GW copyright message was sent
2684 
to stdout.
2685 
*	- Finally gets Ghostscript to run properly on the RS/6000, by
2686 
adding a compiler bug workaround to arc_add and arc_either.
2687 
*	- Finally gets Ghostscript to compile properly on Sun SPARC
2688 
systems, by adding a compiler bug workaround in scan_number.
2689 
 
2690 
Changes the default MS-DOS configuration from 8086/8088 to 80286.
2691 
 
2692 
Adds all the SuperVGA drivers to the BC++ and Watcom executables
2693 
(except for the VESA driver in the Watcom executable).
2694 
 
2695 
Adds a makefile (msc.mak) for the Microsoft C/C++ 7.0 platform.  This
2696 
is currently a MS-DOS, not a MS Windows, platform.
2697 
 
2698 
Changes gp_enumerate_files_init so it takes a gs_memory_procs *, not
2699 
separate proc_alloc_t and proc_free_t arguments; also, it must
2700 
enumerate precisely the requested set of files, not a superset.  THIS
2701 
IS A NON-BACKWARD-COMPATIBLE CHANGE.  It affects all gp_*.c files.
2702 
 
2703 
Adds the P*M drivers and bit.dev to the standard configuration on
2704 
Unix platforms.
2705 
 
2706 
Changes the Watcom makefile so it uses the WATCOM environment variable (by
2707 
default) as the base directory for the Watcom executables.
2708 
 
2709 
Adds the MS Windows COMMDLG.DLL and SHELL.DLL files to the set of
2710 
files incorporated in GSEXE.ZIP, since the new MS Windows code uses
2711 
them, and they aren't provided with Windows 3.0.
2712 
 
2713 
Makes major revisions to the MS Windows platform and driver code, to
2714 
support the gsview front end, and also to remove the dependence on the
2715 
Borland EasyWin library.  NOTE: Compiling the MS Windows code now requires
2716 
Borland C++ 3.1 (not 3.0).
2717 
 
2718 
Changes time_.h so that Ghostscript will compile and run on A/UX.
2719 
 
2720 
Changes the MS-DOS implementation of file enumeration so it always
2721 
treats \s in the file name as literal characters, not escapes, unless
2722 
there are two \\s in a row.  This does the most sensible thing given
2723 
the DOS file naming conventions.
2724 
 
2725 
Adds a %pipe% file device under Unix.
2726 
 
2727 
Adds a makefile for Watcom C under MS Windows.  This is very preliminary;
2728 
in particular, NO display output is supported.
2729 
 
2730 
</pre><h3><a name="V2.6_Fonts"></a>Fonts</h3><pre>
2731 
Fixes bugs:
2732 
	- fonts.mak referred to ncri and puti rather than ncrri and
2733 
putri.
2734 
	- cyr and cyri had the wrong protection.
2735 
	- The Hershey fonts left the font on the stack when they were
2736 
loaded.
2737 
*	- The FontName of an aliased font was the original FontName
2738 
from the file, not the alias.
2739 
*	- Fontmap.BTS had incorrect entries for AvantGarde-Demi and
2740 
AvantGarde-DemiOblique.
2741 
	- Ghostscript pushed userdict, rather than an empty writable
2742 
dictionary, onto the stack when loading a font, leading to name clashes.
2743 
 
2744 
Adds a new cfonts.mak with a full set of rules for compiling all the
2745 
standard Ghostscript fonts (except the Hershey fonts) into C.
2746 
 
2747 
Adds UniqueIDs to the Hershey fonts, and removes the UniqueIDs from
2748 
the Hershey entries in the Fontmap.
2749 
 
2750 
Adds a new Fontmap for VAX/VMS with DECWindows/Motif.
2751 
 
2752 
Changes MakeHersheyFont so it takes the encoding as an additional
2753 
parameter, and changes the Hershey-Symbol font to use SymbolEncoding.
2754 
 
2755 
</pre><h3><a name="V2.6_Drivers"></a>Drivers</h3><pre>
2756 
Fixes bugs:
2757 
	- The !@*&amp;^%#@$ PCL drivers *still* didn't do the right thing
2758 
about vertical spacing: the &lt;ESC&gt;*p+&lt;n&gt;Y command works on all PCL 3,
2759 
4, and 5 printers *except* the LaserJet IIp.
2760 
	- The cdj driver used recursive macros (height, t_margin,
2761 
b_margin) that not all compilers handled correctly.
2762 
	- The djtc driver used some assignments including =*, which
2763 
some compilers dislike.
2764 
	- The S3 driver wouldn't compile correctly with the Watcom
2765 
compiler.
2766 
	- The makefile entry for the S3 driver was wrong.
2767 
	- The SuperVGA drivers returned an error, rather than using
2768 
the highest available resolution, if a too-high resolution was
2769 
requested.
2770 
	- The GIF driver produced an incorrect header for images
2771 
wider or taller than 32K pixels.
2772 
	- The GIF driver wasn't able to handle multi-page documents
2773 
correctly.
2774 
	- The margins on the DeskJet were still not correct.
2775 
	- Some ANSI C compilers rejected a complex expression in
2776 
gdevpccm.c.
2777 
	- Printer drivers didn't recover cleanly from problems in
2778 
opening the scratch files.
2779 
	- The BJ-10e driver used the same name `out' for a label and
2780 
a variable.
2781 
	- The SCO ODT compiler couldn't handle sizeof(ppdev-&gt;fname).
2782 
	- The Epson driver used the wrong value for ESC in the
2783 
initialization string.
2784 
 
2785 
Adds new drivers:
2786 
	- Drivers to produce MS Windows .BMP format output.
2787 
	- A new ATI Wonder display driver (800x600, 16 colors) and a
2788 
1024x768 mode for the existing driver.
2789 
 
2790 
Adds new user-contributed drivers:
2791 
	- A driver for the Tektronix 4693d color printer.  This carries a
2792 
university copyright.
2793 
	- A driver for the SPARCprinter.
2794 
	- A driver for the Canon BJ200 printer.
2795 
	- A driver for the IBM ProPrinter.
2796 
	- A driver for the DEC LJ250 printer, which has a
2797 
PaintJet-compatible mode.
2798 
	- A replacement driver for the Sony NWP533.
2799 
	- A driver that writes TIFF/F (Group 3 fax) files.  This carries
2800 
an external copyright.
2801 
	- A driver for the C.Itoh M8510 printer.
2802 
	- A driver for the Okidata MicroLine 182 9-pin dot-matrix printer.
2803 
	- A Hercules Graphics driver.
2804 
	- A driver for printers under MS Windows.
2805 
	- A driver for direct frame buffer addressing under SCO Unix
2806 
and Xenix and AT&amp;T SVR4.
2807 
 
2808 
Changes the get_bits driver procedure so it always reads a single
2809 
scan line, and optionally does not copy the data.  THIS IS A
2810 
NON-BACKWARD-COMPATIBLE CHANGE.  However, this change does not affect
2811 
any existing printer driver, since these all go through intermediate
2812 
routines in gdevprn.c.
2813 
 
2814 
Changes gdevprn.h, and the relevant printer drivers, so that -DA4
2815 
will change the default paper size for any printer driver.
2816 
 
2817 
Allows the use of NULL or 0 for default procedures in the driver
2818 
procedure vector.
2819 
 
2820 
Adds an optional map_cmyk_color procedure to the driver procedure
2821 
vector.
2822 
 
2823 
Changes the Epson driver so that the minimum amount of white space
2824 
required to use a tab is an easily changed parameter.
2825 
 
2826 
Changes the BGI driver to use separate segments for the Borland
2827 
device drivers, to reduce the risk of overflowing a segment.
2828 
 
2829 
Adds an optimization option (normally enabled) to the PGM and PPM drivers
2830 
such that they revert to PBM or (for PPM) PGM if the page can be
2831 
represented that way.
2832 
 
2833 
Adds a new (optional) driver procedure to get the procedure vector
2834 
for external fonts.
2835 
 
2836 
Adds an argument to gp_open_printer to indicate whether the file should be
2837 
opened in binary or text mode.  THIS IS A NON-BACKWARD-COMPATIBLE CHANGE.
2838 
However, this change does not affect any existing printer driver, since
2839 
these all go through intermediate routines in gdevprn.c.
2840 
 
2841 
Changes the LN03/LA50/LA75 driver so it uses a text record mode to open
2842 
the output file under VMS (by adding an argument to gp_open_printer to
2843 
indicate this.)
2844 
 
2845 
Allows (indeed, encourages) drivers to use far_data to declare the device
2846 
structure, primarily to avoid overflowing the 64K data segment under MS
2847 
Windows.  Changes the file output drivers and many of the printer drivers
2848 
to declare their device structures as far_data.
2849 
 
2850 
Replaces the AT&amp;T 3B1 driver with an updated version (from the same
2851 
contributor).
2852 
 
2853 
Changes the Epson BJ driver and the SPARCprinter driver so they align
2854 
the (0,0) point of the page with the physical corner of the paper
2855 
rather than with the origin of the printable area.
2856 
 
2857 
Removes the EIZO MDB-10 driver, since it caused complications for the
2858 
EGA and VGA drivers and is not a widely used device.
2859 
 
2860 
</pre><h3><a name="V2.6_Interpreter"></a>Interpreter</h3><pre>
2861 
Fixes bugs:
2862 
	- The entry for the copydevice operator in the operator table
2863 
was initialized incorrectly.
2864 
	- printobject and writeobject didn't handle nested arrays.
2865 
	- restore didn't properly close the current file (if
2866 
appropriate), causing an invalidaccess error.
2867 
	- buildfont required the presence of a valid, 4-element
2868 
FontBBox.  (The Red Books say it's required, but Adobe interpreters
2869 
don't require it; some DEC software generates a 3-element FontBBox.)
2870 
	- resourceforall had several bugs; it didn't do even
2871 
approximately the right thing.  There were quite a few other problems
2872 
with the implementation of resources.
2873 
	- setfont, makefont, and scalefont would accept a font with
2874 
no FID entry.
2875 
*	- Loading a .PFB font left the file open (until the next
2876 
restore or quit).
2877 
	- The default (null) font didn't include a PaintType entry,
2878 
which some PostScript files expected.
2879 
*	- The ASCIIHexDecode filter sometimes thought the underlying
2880 
stream was at EOF even when there was (at most one buffer's worth of)
2881 
data left.
2882 
	- iscan.c included &lt;ctype.h&gt; before std.h, causing type name
2883 
clashes on some systems.
2884 
*	- save and restore didn't handle the pointers in the graphics
2885 
state correctly; for example, the current font wasn't restored
2886 
properly.
2887 
	- Binary object sequences at the top interpreter level didn't
2888 
get executed immediately.
2889 
	- On high-resolution devices, the default transfer function
2890 
converted almost-white grays to very light grays rather than white.
2891 
	- The `string' operator was checking the string length
2892 
against max_uint rather than max_ushort, which could cause invalid
2893 
lengths to be accepted.
2894 
*	- deviceinfo caused a stackunderflow error.
2895 
*	- idiv could give incorrect results for quotients or
2896 
remainders that didn't fit in 24 bits.
2897 
*	- The ASCII85Encode filter padded trailing bytes with 1's
2898 
rather than 0's.
2899 
*	- The ASCII85Decode filter had a typo that produced incorrect
2900 
results if there were exactly 2 trailing bytes.
2901 
	- findlibfile didn't push a copy of the file name if it was
2902 
the name of a special (%) file.
2903 
	- setduplexmode was not defined in statusdict, causing
2904 
/undefined errors from some poorly designed input files.
2905 
*	- The CCITTFaxDecode filter had several bugs in 2-D decoding.
2906 
*	- The ASCII85Decode filter didn't read ahead to detect EOD if
2907 
it fell precisely on a buffer boundary.
2908 
	- If a file mentioned on the command line redefined `start',
2909 
Ghostscript would run the new definition rather than the built-in one
2910 
after processing all the files on the command line.
2911 
	- The SCO ODT compiler couldn't handle the conditionals in the
2912 
ngetc (iscan.c) and sgetc* (stream.h) macros.
2913 
	- makefont and scalefont didn't cache the PostScript dictionaries
2914 
for scaled fonts.
2915 
	- Changing the elements of the Encoding of a font dynamically
2916 
didn't take effect if the character was already cached.
2917 
	- makefont and scalefont didn't add the (undocumented) OrigFont
2918 
and ScaleMatrix entries to the new font.
2919 
*	- findfont insisted that the font name be a string or a name.
2920 
	- filenameforall could cause an incorrect transfer of control
2921 
if no files matched the pattern.
2922 
*	- ISOLatin1Encoding had hyphen instead of minus at code 45.
2923 
	- restore didn't reset saved_cbot and saved_ctop correctly;
2924 
as a result, some freed blocks could get abandoned rather than put on
2925 
the free list.
2926 
	- Some numerical constants in zarith.c assumed that longs
2927 
occupied 32 bits.
2928 
 
2929 
Implements additional Level 2 features:
2930 
	- %device%file names (only the "os" device is provided).
2931 
	- &lt;~ ~&gt; for ASCII-85 strings.
2932 
	- Binary error messages.
2933 
	- BuildGlyph.
2934 
	- CCITTFaxDecode filter entries EndOfBlock, Rows, and
2935 
	(undocumented) FirstBitLowOrder.
2936 
	- {set/current}{color/colorspace/overprint/colorrendering/
2937 
	blackgeneration/undercolorremoval}.  (See below under library
2938 
	for limitations.)
2939 
	- Decode for the dictionary form of image.
2940 
	- File access modes a, r/w/a+.
2941 
	- Font entries CDevProc, Metrics2, and WMode.
2942 
	- Font operators cshow, findencoding, rootfont, and
2943 
	setcachedevice2.
2944 
	- glyphshow (emulated with PostScript code).
2945 
	- languagelevel.
2946 
	- realtime.
2947 
	- setbbox.
2948 
	- (Subset of) system and user parameters.
2949 
	- xshow, yshow, and xyshow.
2950 
	- XUIDs for fonts.
2951 
 
2952 
Moves the installation of systemdict and the initial allocation of
2953 
globaldict (if relevant) and userdict from gs_init.ps to iinit.c.
2954 
 
2955 
Makes Level 2 features dynamically selectable through the
2956 
.setlanguagelevel operator; disables all Level 2 features
2957 
(specifically including automatic dictionary expansion) unless the
2958 
level2 feature is included and active.
2959 
 
2960 
Adds the .knownget operator for speeding up system procedures.
2961 
 
2962 
Renames the type1addpath operator as .type1addpath; adds an optional
2963 
left side bearing argument; changes it so it does not do the
2964 
setcachedevice, fill, or stroke, but does do a moveto for the
2965 
character width.  Changes Type1BuildChar appropriately.  (All this is
2966 
needed to make WMode work.)
2967 
 
2968 
Removes the .setmetrics operator, which is no longer needed.
2969 
 
2970 
* Changes the meaning of the user_errors argument to gs_run_file and
2971 
gs_run_string so that -1 means always return on an error, 0 means
2972 
only return on an error not within a `stopped'.
2973 
 
2974 
Adds all the necessary checks and operators for local/global VM, but
2975 
doesn't actually implement local/global mode.
2976 
 
2977 
Changes setcachedevice back so that it requires 4 numbers on the
2978 
stack rather than a 4-element array.  (It was changed to be the other
2979 
way in release 2.0, but that was because I didn't realize that fonts
2980 
had to have an executable FontBBox, and some of the Ghostscript fonts
2981 
didn't.)
2982 
 
2983 
Changes all the filter operators from .filterxxx to .filter_xxx, and
2984 
removes the need to enumerate them in gs_init.ps.
2985 
 
2986 
Adds .oserrno and .oserrorstring operators for getting the last OS
2987 
error (in the current context).
2988 
 
2989 
Changes gs_finit similarly to gp_exit.  Adds gs_exit_with_code that
2990 
takes both an exit status and a Ghostscript error code.
2991 
 
2992 
Changes the name of name.h to iname.h.
2993 
 
2994 
Adds support for the `interrupt' error (but doesn't provide any standard
2995 
way of generating one, other than through the gp_check_interrupts polling
2996 
function).
2997 
 
2998 
Adds copyright to systemdict.
2999 
 
3000 
Changes the spot halftone screen to an elliptical screen supplied by
3001 
Berthold K. P. Horn.
3002 
 
3003 
Adds a check that the first token in gs_init.ps is an integer.  In
3004 
conjunction with other code in gs_init.ps, this should catch all attempts
3005 
to run Ghostscript with a gs_init.ps that doesn't match the executable.
3006 
 
3007 
Changes all relevant occurrences of sizeof to size_of in order to
3008 
work with the buggy SVR4.2 C compiler.
3009 
 
3010 
Changes gp_exit so it is passed both the Ghostscript error code and
3011 
the exit status code as arguments.  This is backward-compatible for
3012 
all but the pickiest compilers.
3013 
 
3014 
Adds a call on gp_check_interrupts() after fwrite calls in the stream
3015 
machinery.  This prevents lengthy console output from locking out
3016 
other programs.
3017 
 
3018 
Changes a couple of occurrences of op_def_ptr in iinit.c to work around a
3019 
`const' bug in Sun's SC1.0 compiler.
3020 
 
3021 
Adds a special hack in the 'where' operator to work around a bug in Aldus
3022 
Freehand 2.x.
3023 
 
3024 
Changes all empty argument lists from () to (void), which is the ANSI
3025 
C syntax.
3026 
 
3027 
Adds a hack to ignore ^[ and ^D^[ tokens, to work around the prologue
3028 
and epilogue emitted by the MS Windows LaserJet IV driver.
3029 
 
3030 
Defines the processcolors operator, which should not be needed, but
3031 
is required because of bugs in Lotus 1-2-3 and Adobe PhotoShop.
3032 
 
3033 
Changes the allocator (ialloc) to fill all allocated and/or freed
3034 
blocks with a marker if gs_alloc_debug is set, as gs_malloc and
3035 
gs_free already do.
3036 
 
3037 
</pre><h3><a name="V2.6_Library"></a>Library</h3><pre>
3038 
Fixes bugs:
3039 
	- 16-bit memory devices stored the bytes of each pixel in the
3040 
wrong order.
3041 
	- copy_mono did the wrong thing when copying 1 source chunk
3042 
to 2 destination chunks with polarity inverted.  (This probably
3043 
didn't affect any actual uses of Ghostscript.)
3044 
*	- The compile-time check for ints being 2 or 4 bytes used the
3045 
#error directive, which most compilers don't recognize.
3046 
	- arc and arcn didn't do the right thing for degenerate
3047 
(single-point) arcs, or for arcs drawn in the "wrong" direction that
3048 
were multiples of 360 degrees.
3049 
	- charpath did the wrong thing with Type 3 fonts.
3050 
	- copyscanlines gave an error if the buffer was too large.
3051 
	- The copy_mono procedure (used for text and halftones) for
3052 
2- and 4-bit-per-pixel memory and printer devices incorrectly
3053 
incremented the destination pointer after every pixel, instead of
3054 
only after every byte.
3055 
	- The fill_rectangle procedure (used for graphics) for 2- and
3056 
4-bit-per-pixel memory and printer devices, if given any color other
3057 
than all 0's or all 1's, multiplied the X coordinate and width by 2
3058 
or 4, thereby filling the wrong area.
3059 
	- The use of 'data' in both gs_type1_data and gs_font upset
3060 
the VMS compiler.
3061 
	- The `Flex' feature wasn't implemented for Type 1 fonts,
3062 
which caused serious errors in rendering some fonts that use it.
3063 
(Unfortunately, some Adobe fonts violate the specification, so we had
3064 
to implement Flex to always use a curve.)
3065 
*	- Stem width adjustment was too eager, producing very strange
3066 
effects on small characters with tight curves (a curve point could
3067 
get snapped to the other side of the open area).
3068 
	- The allocator didn't align structures adequately on
3069 
machines where sizeof(long) or sizeof(char *) was 8 bytes.
3070 
	- The test for IEEE floating point gave an incorrect
3071 
(negative) result on machines where sizeof(long) was 8 bytes.
3072 
	- genarch.c assumed that the result of subtracting two
3073 
pointers was an int, leading to a garbage arch.h file on systems
3074 
where this was false.
3075 
*	- The Type 1 font interpreter incorrectly reset the adjusted
3076 
path position to be the same as the unadjusted path position whenever
3077 
it returned control to the client (in particular, for callothersubr),
3078 
leading to discontinuities and distortions in the character shapes.
3079 
*	- Accented characters in Type 1 fonts often misplaced the
3080 
accent to the left.
3081 
	- gsmisc.c wouldn't compile on machines with 64-bit pointers,
3082 
because _pad was 0, and ANSI compilers don't accept 0-length arrays.
3083 
	- pathforall got confused if the client procedures modified
3084 
the path.
3085 
	- The command list file representation limited X and Y
3086 
coordinates to 15 bits.
3087 
*	- stroke could produce spikes or other garbage for mitered
3088 
joins as a result of stroke adjustment.
3089 
	- The params_size field of the null device was wrong, so
3090 
scaling the null device produced unpredictable results.
3091 
 
3092 
Changes monobit memory devices to always store data big-endian.  This
3093 
eliminates byte-swapping, at the cost of slightly slower rendering.
3094 
 
3095 
Removes the memswab* routines, since they are no longer needed.
3096 
 
3097 
Implements gs_cshow_[n_]init, which provides support for cshow, and
3098 
gs_xyshow_[n_]init, which provides support for {x,y,xy}show.
3099 
 
3100 
Adds an optional left side bearing argument to gs_type1_interpret.
3101 
 
3102 
Changes gs_type1_interpret so it does not do a setcachedevice, fill,
3103 
or stroke, but only appends the character outline to the path
3104 
(including a moveto for the character width.)
3105 
 
3106 
Removes gs_setmetrics, which is no longer needed.
3107 
 
3108 
Implements gs_setcachedevice2, which provides support for
3109 
setcachedevice2.
3110 
 
3111 
Speeds up gsave/grestore by allocating, deallocating, and copying as
3112 
much as possible of the graphics state in a single operation.
3113 
 
3114 
Implements gs_{set/current}{color/colorspace/overprint/colorrendering/
3115 
blackgeneration/undercolorremoval}.  Device, indexed (with table, not
3116 
with procedure), CIE, and (substituted) separation colors are
3117 
supported; some of the setup code for patterns is also present.
3118 
 
3119 
Increases the size of temporary file names in gdevprn.h from 30
3120 
characters to 60.
3121 
 
3122 
Changes the character cache to be allocated dynamically in chunks.
3123 
 
3124 
Splits gxcache.c into gxccache.c (fast "hit" code) and gxccman.c (all
3125 
other code).
3126 
 
3127 
Changes all occurrences of sizeof to size_of in order to work with the
3128 
buggy SVR4.2 C compiler.
3129 
 
3130 
Adds a new concept of "external fonts", which allow a driver to
3131 
substitute its own fonts for the ones obtained through the normal
3132 
font machinery.
3133 
 
3134 
Changes all empty argument lists from () to (void), which is the ANSI
3135 
C syntax.
3136 
 
3137 
</pre>
3138 
 
3139 
<hr>
3140 
 
3141 
<h2><a name="Version2.5.2"></a>Version 2.5.2 (9/20/92)</h2>
3142 
 
3143 
<p>This is yet another bug fix release to (finally!) get the PCL drivers
3144 
working again.
3145 
 
3146 
<h3><a name="V2.5.2_Procedures"></a>Procedures</h3><pre>
3147 
Fixes bugs:
3148 
	- The comment in devs.mak for cdjcolor said it used 8 bits
3149 
per pixel, rather than the correct 24.
3150 
 
3151 
Adds gsbj/dj/lj/lp and gslp.ps to the installed files on Unix
3152 
systems.
3153 
 
3154 
Removes dps.dev and level2.dev from the standard configurations on
3155 
all platforms, since the presence of the setcolor operator was
3156 
causing the output of some common applications to fail.
3157 
 
3158 
</pre>
3159 
 
3160 
<h3><a name="V2.5.2_Utilities"></a>Utilities</h3><pre>
3161 
Fixes bugs:
3162 
	- font2c produced invalid output for any font that didn't use
3163 
StandardEncoding or ISOLatin1Encoding.
3164 
 
3165 
</pre>
3166 
 
3167 
<h3><a name="V2.5.2_Platforms"></a>Platforms</h3><pre>
3168 
Fixes bugs:
3169 
	- gp_sysv.c required an extern long timezone.
3170 
 
3171 
</pre>
3172 
 
3173 
<h3><a name="V2.5.2_Drivers"></a>Drivers</h3><pre>
3174 
Fixes bugs:
3175 
	- The PCL drivers were *still* doing the wrong thing about
3176 
zeroing the seed row for Mode 3 compression.
3177 
	- Setting the resolution with -r didn't work under Windows.
3178 
	- The Windows driver got a stack overflow if it was ever
3179 
asked to display a bit image wider than 32 pixels.
3180 
	- The Tseng driver didn't sense the model (ET3000 vs. ET4000)
3181 
correctly.
3182 
 
3183 
Adds the eps9high device to the standard MS-DOS makefiles.
3184 
 
3185 
</pre>
3186 
 
3187 
<h3><a name="V2.5.2_Interpreter"></a>Interpreter</h3><pre>
3188 
Fixes bugs:
3189 
	- gs_run_string used gs_user_errors (a global) rather than
3190 
user_errors (its argument) to control error handling.  (This does not
3191 
affect normal operation of Ghostscript, only use as a server.)
3192 
	- eexec popped the top element of the dictionary stack
3193 
afterwards even if the encrypted code had pushed something onto it.
3194 
This caused problems for some badly written PostScript code.
3195 
	- The printed form of real numbers didn't always include a
3196 
decimal point, causing compatibility problems.
3197 
 
3198 
Makes -s and -d work for device properties.
3199 
 
3200 
Increases the cache limit on large-memory systems.
3201 
 
3202 
Adds a check to ensure that the revision of gs_init.ps matches that
3203 
of the interpreter.
3204 
 
3205 
Adds the .knownget operator.
3206 
 
3207 
</pre><h3><a name="V2.5.2_Library"></a>Library</h3><pre>
3208 
Fixes bugs:
3209 
	- The raster computation in clist_render_init, and the
3210 
computation of state_size in clist_open, didn't widen an operand to
3211 
long, leading to possibly incorrect operation for 24-bit-per-pixel
3212 
printers on MS-DOS systems.
3213 
	- The flatness was set too large for Type 1 characters,
3214 
leading to visible straight edges instead of curves at large sizes.
3215 
	- Type 1 fonts that contained out-of-range coordinates would
3216 
produce garbled output.  (This was not a problem with the standard
3217 
Ghostscript fonts, or with Adobe Type Manager fonts.)
3218 
	- gschar0.c wouldn't compile, because it referred to a
3219 
non-existing structure member penum-&gt;chr.  (This had no effect on
3220 
Ghostscript's operation.)
3221 
	- The curve flattener required line segments to be no more
3222 
than 8 x the flatness in length, leading to an enormous number of
3223 
segments.
3224 
	- pathforall would cause an addressing fault if the path
3225 
consisted of only a moveto.
3226 
 
3227 
Refactors some header files so that std.h is always included before
3228 
any system header file that might include sys/types.h.
3229 
 
3230 
Adds logic for removing top and bottom blank rows in cached
3231 
characters.  (This is the beginning of compression for the cache.)
3232 
 
3233 
Changes the arguments of memswab2/4 from char * to byte *, for more
3234 
accurate type conformance.
3235 
 
3236 
</pre>
3237 
 
3238 
<h2><a name="Version2.5.1"></a>Version 2.5.1 (9/11/92)</h2>
3239 
 
3240 
<p>This is the usual bug fix re-release.
3241 
 
3242 
<h3><a name="V2.5.1_Procedures"></a>Procedures</h3><pre>
3243 
Fixes bugs:
3244 
	- The makefile rules for compiled fonts had a circular
3245 
dependency.
3246 
	- `make begin' didn't work properly on all platforms.
3247 
 
3248 
Ensures that all batch files end with a newline.  (The absence of the
3249 
newline was confusing the GNU diff program.)
3250 
 
3251 
Documents the fact that the -dASCIIOUT switch no longer exists.
3252 
 
3253 
</pre><h3><a name="V2.5.1_Utilities"></a>Utilities</h3><pre>
3254 
Fixes bugs:
3255 
	- pstoppm didn't `bind' its internal procedures.
3256 
	- grestoreall would undo the output device selected by
3257 
pstoppm.
3258 
 
3259 
Changes the utilities for reading and writing Type 1 character
3260 
outlines so they can work with stack representations as well as
3261 
arrays.
3262 
 
3263 
Removes the pfbtogs.ps, phonbook.ps, and showpbm.ps utilities from
3264 
the distribution.
3265 
 
3266 
Adds a gslj utility to parallel gslp and gsdj.
3267 
 
3268 
</pre><h3><a name="V2.5.1_Platforms"></a>Platforms</h3>
3269 
 
3270 
<pre>
3271 
Adds the DeskJet 500C drivers (cdeskjet/cdj*) to the MS-DOS / Borland
3272 
C++, MS-DOS / Watcom C/386, and MS-Windows configurations.
3273 
 
3274 
Removes the PCX file driver from the MS Windows executable, because
3275 
the static data segment exceeded 64K.
3276 
 
3277 
Makes some changes in the Unix System V platform file (gp_sysv.c) and
3278 
in time_.h and unixtail.mak to accommodate the 3B1.
3279 
 
3280 
</pre><h3><a name="V2.5.1_Fonts"></a>Fonts</h3><pre>
3281 
Fixes bugs:
3282 
	- The Charter-Italic font was named bchi.pfa rather than
3283 
bchri.pfa.
3284 
	- The Cyrillic fonts (cyr.gsf, cyri.gsf) were omitted from
3285 
the fileset.
3286 
	- Ghostscript incorrectly assumed that all Type 1 fonts had a
3287 
FontInfo dictionary.
3288 
	- .loadfont used false PFBDecode, so a few .PFB fonts would
3289 
get errors because the first eexec byte would be whitespace.
3290 
 
3291 
Changes font2c and its supporting code so that compiled fonts are
3292 
location-independent.
3293 
 
3294 
</pre><h3><a name="V2.5.1_Drivers"></a>Drivers</h3><pre>
3295 
Fixes bugs:
3296 
	- The margins for the H-P printers were still wrong.
3297 
	- The H-P drivers accidentally cleared the compression seed
3298 
row when switching compression modes.
3299 
	- Some of the H-P drivers used the wrong control codes for
3300 
skipping blank lines.
3301 
 
3302 
Adds user-supported drivers for the AT&amp;T 3B1 console device, and for
3303 
the NEC P6+ printer.
3304 
 
3305 
Updates the SunView driver with a new version supplied by a(nother)
3306 
user.
3307 
 
3308 
Changes the X Windows driver so the Ghostscript window doesn't get
3309 
input focus.
3310 
 
3311 
Changes the common code for the printer drivers so that if it can
3312 
allocate a full bitmap but there isn't at least a minimum amount of
3313 
memory left afterwards, it switches to banding.
3314 
 
3315 
Changes the Windows driver so it handles devices with more than 8
3316 
bits per pixel.  (We haven't been able to test this.)
3317 
 
3318 
Adds a read-only PageCount device property (for printer devices
3319 
only).
3320 
 
3321 
Changes all Aladdin-supported drivers to clip drawing requests to the
3322 
((0,0), (width,height)) rectangle of device space.
3323 
 
3324 
</pre><h3><a name="V2.5.1_Interpreter"></a>Interpreter</h3><pre>
3325 
Fixes bugs:
3326 
	- Closing a NullEncode filter always gave an ioerror.
3327 
	- If a single-character name occurred 1 character before the
3328 
end of an input buffer, the character would be doubled.
3329 
	- The procedures in gs_statd.ps didn't use "bind".
3330 
	- Setting the page size didn't work properly with devices
3331 
with rotated coordinate systems.
3332 
	- If an error occurred, and the error object wasn't the last
3333 
element of its procedure, the interpreter would re-execute the error
3334 
object after running the error handler.
3335 
	- Memory devices didn't get resized if HWSize was changed,
3336 
leading to out-of-bounds memory accesses.
3337 
 
3338 
Moves revision and revisiondate from gs_init.ps to iinit.c.  Adds a
3339 
-v switch that just prints these out.
3340 
 
3341 
Arranges things so that if Ghostscript is reading from a pipe (`-'
3342 
switch on the command line) and encounters an error, it exits with
3343 
status 1 rather than 0.
3344 
 
3345 
Changes the interpreter interface so the caller explicitly passes a
3346 
pointer for storing an error object.
3347 
 
3348 
</pre><h3><a name="V2.5.1_Library"></a>Library</h3><pre>
3349 
Fixes bugs:
3350 
	- The automatic adjustment of the scaling for variant paper
3351 
sizes caused the image to get expanded when it should have been
3352 
contracted, and vice versa.
3353 
	- The curve flattener insisted that each line segment be no
3354 
more than 2 x the flatness in length, leading to an enormous number
3355 
of segments even when not necessary for accuracy.
3356 
	- flattenpath and strokepath discarded a trailing moveto.
3357 
	- strokepath treated "0-width" lines as really having a width
3358 
of zero, rather than one pixel.
3359 
	- Buffered devices weren't closed and reopened if the amount
3360 
of buffer space was changed.
3361 
	- stroke used the line cap at the beginning of each subpath
3362 
even if the subpath was closed.
3363 
 
3364 
Removes the requirement that the clipping rectangle fall in the
3365 
non-negative quadrant of device space.  (This was causing problems
3366 
for Ghostview, but removing it required adding the extra clipping
3367 
step to the drawing routines in the drivers.)
3368 
 
3369 
</pre>
3370 
 
3371 
<h2><a name="Version2.5"></a>Version 2.5 (8/18/92)</h2>
3372 
 
3373 
<p>This version adds Type 1 hinting, CCITTFax encoding and decoding, and
3374 
Microsoft Windows support, as well as the usual minor improvements
3375 
and bug fixes.
3376 
 
3377 
<h3><a name="V2.5_Procedures"></a>Procedures</h3><pre>
3378 
Fixes bugs:
3379 
	- GSIMPATH, SLZWD, and SLZWE were omitted from the VMS
3380 
makefiles, and GSIM2OUT was not removed.
3381 
	- landscap.ps messed up the current path.
3382 
 
3383 
Adds new switches:
3384 
	-dSAFER disables file writing and directory modification.
3385 
	-dESTACKPRINT causes errors to print the execution stack with
3386 
== instead of =.
3387 
	-sOutputFile=&lt;string&gt; replaces -sOUTPUTFILE (which is still
3388 
recognized) for setting the output file or pipe for the default
3389 
(printer) device.
3390 
	-sPAPERSIZE=&lt;sizename&gt; initializes the paper size.
3391 
	-dBufferSpace=&lt;number&gt; sets the buffer size for the default
3392 
(printer) device.
3393 
 
3394 
For Unix systems, changes the directories in GS_LIB_DEFAULT from
3395 
`pwd` to $(gsdatadir), i.e., normally $(datadir)/ghostscript, where
3396 
datadir is normally /usr/local/lib.
3397 
 
3398 
Adds a note in the header file to the effect that the X Windows
3399 
driver expects to find header files in $(XINCLUDE)/X11, not in
3400 
$(XINCLUDE).
3401 
 
3402 
Changes -q so it defines QUIET as true instead of null (so it can be
3403 
used in the middle of the command line as well as at the beginning).
3404 
 
3405 
Renames the history.doc file as NEWS.
3406 
 
3407 
</pre>
3408 
 
3409 
<h3><a name="V2.5_Utilities"></a>Utilities</h3>
3410 
 
3411 
<h3><a name="V2.5_Platforms"></a>Platforms</h3><pre>
3412 
Fixes bugs:
3413 
	- The stack size was not getting increased on the Watcom
3414 
platform.
3415 
 
3416 
Removes "b" from the scratch file opening modes in gp_unix.c and
3417 
(conditionally) in gdevprn.c, to pacify the DECstation Ultrix system.
3418 
 
3419 
Adds a makefile (bcwin.mak) and a platform file (gp_mswin.c) for
3420 
Microsoft Windows.
3421 
 
3422 
On MS-DOS platforms (including Windows), uses the TEMP environment
3423 
variable to designate the directory for scratch files.
3424 
 
3425 
Changes std.h so that the VMS C compiler uses function prototypes and
3426 
'const'.
3427 
 
3428 
Changes the VMS cc makefile so it doesn't use ansi2knr.
3429 
 
3430 
</pre><h3><a name="V2.5_Fonts"></a>Fonts</h3><pre>
3431 
Fixes bugs:
3432 
	- findfont left an extra entry on the stack if it couldn't
3433 
find the default font.
3434 
 
3435 
Renames bchi, ncri, and puti as bchri, ncrri, and putri, to conform
3436 
with the naming scheme for other fonts.
3437 
 
3438 
Adds $(CCFLAGS) to the command line used for compiling fonts.
3439 
 
3440 
Converts the .pfa fonts (CharterBT, IBM Courier, and Utopia) to .gsf,
3441 
by removing eexec encryption and also removing some mysterious
3442 
unmapped characters from Courier.  This makes these fonts work with
3443 
DISKFONTS.
3444 
 
3445 
Changes the implementation of compiled fonts so they are read-only
3446 
and sharable (no external references).  (They are, however, not
3447 
position-independent.)
3448 
 
3449 
Provides a way to use compiled fonts on platforms that limit the
3450 
number of characters in an identifier.
3451 
 
3452 
Adds public-domain Cyrillic and Cyrillic-Italic fonts.
3453 
 
3454 
Adds a 'userdict begin' to .loadfont, because Type 3 fonts produced
3455 
by Fontographer expect a writable dictionary on the top of the stack.
3456 
 
3457 
Changes definefont for Type 1 fonts to insert UnderlinePosition and
3458 
UnderlineThickness entries in FontInfo if they are absent, because
3459 
many word processors incorrectly assume these entries are present.
3460 
 
3461 
</pre><h3><a name="V2.5_Drivers"></a>Drivers</h3><pre>
3462 
Fixes bugs:
3463 
	- The documentation in use.doc said that the densities for
3464 
9-pin Epson printers were 60x60 to 240x60, rather than 60x72 to
3465 
240x72.
3466 
	- gdevprn.c smashed one byte beyond the end of the string
3467 
given as the OutputFile device property.
3468 
	- The X11 driver used XVisualIDFromVisual, which is not
3469 
defined in X11R3.
3470 
	- The SunView driver modified the input data, which was
3471 
declared as const.
3472 
	- The LaserJet IIP and III drivers shifted the page 185
3473 
pixels to the left and 0.25" down, because the initialization string
3474 
was incorrect.
3475 
	- The PCX driver wrote 16-bit values using the byte ordering
3476 
of the platform, rather than always LSB first.
3477 
	- For vertical spacing, the LaserJet and DeskJet drivers used
3478 
a command that spaces N/300", rather than N scan lines, but gave it a
3479 
parameter in scan lines.
3480 
	- The VESA driver didn't allocate a full 256-byte buffer for
3481 
reading the mode information from the BIOS, causing the stack to get
3482 
smashed by newer VESA implementations.
3483 
	- The VESA driver didn't use the scan line length returned by
3484 
the BIOS, causing garbage output for some cards and some resolutions.
3485 
	- The generic printer driver didn't free the bitmap when
3486 
closing the device, if it fit entirely in memory.
3487 
	- The PaintJet driver allocated its data areas on the stack
3488 
instead of with gs_malloc.
3489 
	- The generic printer driver didn't attempt to increase the
3490 
buffer size if it was too small.
3491 
	- The band list driver didn't split large bitmaps properly,
3492 
leading to garbled characters at high resolutions.
3493 
	- The GIF and PCX drivers used a color map that often turned
3494 
gray colors into non-grays.
3495 
 
3496 
Changes the default put_props procedure so that if the device is
3497 
open, setting HWSize and/or HWResolution closes the device and
3498 
reopens it.
3499 
 
3500 
Adds a driver for Microsoft Windows 3.n.
3501 
 
3502 
Updates the 'cdj' and 'dj500c' DeskJet 500C drivers with new versions.
3503 
(This are user-contributed drivers.)
3504 
 
3505 
Changes gdev_prn_put_props so OutputFile can be changed dynamically.
3506 
 
3507 
Updates the DEC LN03 driver to also handle the LA50 and LA75.  (This
3508 
is a user-contributed driver with a FSF copyright.)
3509 
 
3510 
Changes the LaserJet/DeskJet driver so that -DA4 in the makefile
3511 
makes A4 paper the default.  The driver now also sends an appropriate
3512 
page size selection command to the printer if the printer supports it.
3513 
 
3514 
Changes all the Aladdin-supported drivers to return appropriate error
3515 
codes rather than -1.
3516 
 
3517 
Adds a driver for the S3 86C911, a PC graphics accelerator used in
3518 
the popular Diamond Stealth board.  This is the first driver that
3519 
uploads character bitmaps to a device; others will probably follow.
3520 
 
3521 
Adds user-supplied code to the Epson driver so it will do triple
3522 
passes on 9-pin printers for higher resolution.
3523 
 
3524 
Adds user-supplied code for the PaintJet XL to the PaintJet driver.
3525 
 
3526 
</pre><h3><a name="V2.5_Interpreter"></a>Interpreter</h3><pre>
3527 
Fixes bugs:
3528 
	- zdps1.c didn't include alloc.h.
3529 
	- On 32-bit systems, if maxlength of a dictionary was less
3530 
than the actual allocated space, length could become larger than
3531 
maxlength.
3532 
	- flushfile didn't actually flush data when reading.
3533 
	- The ASCII85Decode filter signalled EOF prematurely.
3534 
	- The scanner interpreted .3D.glorp as the number 0.3, rather
3535 
than as a name.
3536 
	- Closing a file freed the stream structure, creating
3537 
dangling references if there were other file objects pointing to the
3538 
same stream.
3539 
	- eexec called handleerror if an error occurred, instead of
3540 
letting the error propagate to an enclosing stopped.
3541 
	- gs.h made perror illegal, instead of defining it in terms
3542 
of strerror.
3543 
	- One-character names weren't being allocated at
3544 
initialization, so they could be left dangling after a restore.
3545 
	- Internal gsaves (i.e., the ones in show and setcachedevice)
3546 
didn't also save istate, so setfont inside a BuildChar procedure
3547 
might cause the font outside to get changed.
3548 
	- The allocator incorrectly freed objects in the current
3549 
chunk that were older than the current save.
3550 
	- mark was just an object, rather than an operator, so 'bind'
3551 
didn't bind it.  (This is theoretically a problem for null, true, and
3552 
false also, but even more unlikely to be a problem in practice.)
3553 
	- packed_get didn't cast packed integers to int, so negative
3554 
integer elements of packed arrays came out wrong.
3555 
	- quit just did a gs_exit, instead of returning to the driver
3556 
in an orderly way.
3557 
	- Because check_type_access checked for errors in the wrong
3558 
order, sometimes type errors were reported as access errors.
3559 
	- eq didn't check for stack underflow.
3560 
	- Some of the stream_procs structures weren't properly
3561 
declared const, leading to link errors on VMS.
3562 
 
3563 
Implements currentcolor, currentcolorspace, setcolor, and
3564 
setcolorspace (for DeviceGray, DeviceRGB, and DeviceCMYK only).
3565 
 
3566 
Implements the dictionary form of image and imagemask.  All the pairs
3567 
in the Decode array must be the same; Interpolate is ignored.  The
3568 
only supported color spaces are DeviceGray, DeviceRGB, and
3569 
DeviceCMYK.
3570 
 
3571 
Implements files as allowable sources for the image operators.
3572 
 
3573 
Removes the index field from the name structure, moving it to the
3574 
'size' field of name refs.
3575 
 
3576 
Changes the unread/sungetc operation to require that the character be
3577 
the same as the last one read from the file.
3578 
 
3579 
Adds fflush calls to some debugging printout routines, because Unix
3580 
sometimes buffers terminal output.
3581 
 
3582 
Implements the CCITTFaxEncode and CCITTFaxDecode filters.  Implements
3583 
the general case of the SubFileDecode filter.
3584 
 
3585 
Changes definefont to treat a UniqueID of 0 as equivalent to no
3586 
UniqueID, because Fontographer output apparently often violates the
3587 
specification in this way.
3588 
 
3589 
Changes the default printer screen from 32.5 to 46 cells/inch.  (The
3590 
old value was appropriate for a hand-rotated cell with two spots in
3591 
it.)
3592 
 
3593 
Changes the utility routines to allow an integral real wherever an
3594 
integer parameter is expected in a dictionary, because Fontographer
3595 
produces fonts that violate the Adobe specification in this way.
3596 
 
3597 
Adds a `dosio' feature that provides direct access to memory and to
3598 
I/O ports under MS-DOS.  (This feature is not included in the
3599 
standard executables, of course.)
3600 
 
3601 
Changes the default character cache limit to a 1/4" x 1/4" character
3602 
at the default resolution, rather than basing it on the preallocated
3603 
cache size.
3604 
 
3605 
Removes support for t_color objects, which haven't actually been used
3606 
for several releases.
3607 
 
3608 
Implements setcmykcolor and currentcmykcolor as operators, so they
3609 
will interact properly with setcolorspace and currentcolorspace.
3610 
 
3611 
Changes the name of the file.h header file to files.h, to work around
3612 
a bug in the VMS header library.
3613 
 
3614 
Adds command line switches @file (to treat file as more command line,
3615 
to get around the DOS 128-character command line limit) and -ffile
3616 
(so one can specify file names that begin with - or @).
3617 
 
3618 
Changes the PFBDecode filter so it takes an additional boolean that
3619 
says whether or not to convert binary packets to hex.  (Conversion to
3620 
hex and back to binary accounted for a substantial amount of the time
3621 
required to load .PFB fonts.)
3622 
 
3623 
Splits off `copydevice' as a separate operator again.
3624 
 
3625 
</pre><h3><a name="V2.5_Library"></a>Library</h3><pre>
3626 
Fixes bugs:
3627 
	- In the VMS environment, string_.h used its own prototypes
3628 
for the str... and mem... functions instead of &lt;string.h&gt;
3629 
	- gx_alloc_char_bits declared cdsize as long, but didn't
3630 
shorten it when passing it to shorten_cached_char.
3631 
	- Stroking didn't suppress fattening of the lines.
3632 
	- kshow didn't update the cached CTM information in the show
3633 
enumerator when returning from the callout, so further characters
3634 
could get drawn in the wrong place.
3635 
	- When a memory device returned its initial matrix, it
3636 
smashed the padding fields, which contained the interpreter's type
3637 
information.
3638 
	- setcachedevice didn't set the initial matrix in the cache
3639 
memory device.
3640 
	- image_set_rgb (in the image operators) didn't do a
3641 
gx_color_from_rgb, so in principle one could sometimes get incorrect
3642 
colors in an image.
3643 
	- The decision about whether or not to cache a character
3644 
bitmap incorrectly compared the character size against cmax rather
3645 
than cdata_size.
3646 
	- show didn't reset the in_cachedevice flag in the graphics
3647 
state, so characters rendered by a recursive show were never cached.
3648 
	- clip and eoclip didn't release the intermediate flattened
3649 
clip path, causing memory to be lost.
3650 
	- The tile_diff routine didn't handle the case of two
3651 
identical tiles properly; this produced garbage in the band list
3652 
file.
3653 
	- stringwidth didn't round the character origin to an
3654 
integral pixel; this interacted badly with hinting, causing
3655 
improperly hinted characters to wind up in the cache.
3656 
	- Bitmaps (including characters) were displaced, as well as
3657 
being clipped, if they intersected the top of a clipping region.
3658 
	- In gxclist and gdevmem1, the raster computation (although
3659 
not the result) could overflow an int on 16-bit machines.
3660 
 
3661 
Implements decoding (sample mapping) for image and imagemask.
3662 
 
3663 
Implements hinting for Type 1 fonts, based on (but not copying) the
3664 
algorithms from the X11R5 tape.
3665 
 
3666 
Changes curve rasterizing to use sampling, rather than recursive
3667 
subdivision, for characters.  This produces noticeably better output.
3668 
Speed penalty for non-cached characters is less than 10% at display
3669 
resolutions, up to 50% for 300 dpi printers.
3670 
 
3671 
Implements gs_setcmykcolor and gs_currentcmykcolor.  These are
3672 
semi-fake, since they simply convert the color to and from RGB, but
3673 
the former does set the current color space properly.
3674 
 
3675 
Changes clipping regions so they use the any-part-of-pixel rule
3676 
rather than the center-of-pixel rule.  This helps avoid dropouts when
3677 
using very small regions.
3678 
 
3679 
Implements stroke adjustment.
3680 
 
3681 
</pre>
3682 
 
3683 
<hr>
3684 
 
3685 
<h2><a name="Version2.4.2"></a>Version 2.4.2 (5/8/92)</h2>
3686 
 
3687 
<p>
3688 
This is another quick release.  It finally fixes rotated halftone
3689 
screens, and cleans up a few minor problems from 2.4.1.
3690 
 
3691 
<p>
3692 
This release is being distributed only to beta testers and commercial
3693 
licensees, since I don't want to be distracted from working on 2.5.
3694 
 
3695 
<h3><a name="V2.4.2_Procedures"></a>Procedures</h3><pre>
3696 
Fixes bugs:
3697 
	- UTRACE still appeared in the VMS makefiles.
3698 
	- The support files (*.bat, *.doc, *.gsf, *.ps, Fontmap,
3699 
COPYING, README) weren't included in the MS-DOS tar file.
3700 
	- The Unix install script didn't install landscap.ps.
3701 
 
3702 
Replaces the type1imagepath operator with PostScript code (impath.ps,
3703 
type1ops.ps) based on the new .imagepath operator.
3704 
 
3705 
Renames LICENSE as COPYING.
3706 
 
3707 
</pre><h3><a name="V2.4.2_Utilities"></a>Utilities</h3><pre>
3708 
Fixes bugs:
3709 
	- pcharstr.ps had an occurrence of Subrs rather than /Subrs,
3710 
causing it to not print the Subrs, or to get an error if there were
3711 
none.
3712 
	- font2c.ps didn't get the const declarations for string
3713 
dictionaries quite right.
3714 
	- The missing newline at the end of gsbj.bat confused GNU
3715 
diff.
3716 
	- ansi2knr would go into an infinite loop if a statement
3717 
exceeded its internal buffer size.
3718 
	- Compiled fonts would get processed by ansi2knr, which
3719 
messed them up.
3720 
 
3721 
</pre><h3><a name="V2.4.2_Platforms"></a>Platforms</h3><pre>
3722 
Fixes bugs:
3723 
	- Ghostscript didn't supply equivalents for rename and
3724 
gettimeofday, which some System V platforms lack.
3725 
	- The missing newline at the end of gp_dosfb.c confused GNU
3726 
diff.
3727 
 
3728 
Changes the Borland makefiles so that stack checking is only enabled
3729 
if DEBUG or TDEBUG is set.
3730 
 
3731 
</pre><h3><a name="V2.4.2_Fonts"></a>Fonts</h3>
3732 
 
3733 
<pre>
3734 
Changes the names of the Utopia fonts from utrg/utb/utbi/uti to
3735 
putr/putb/putbi/puti, for consistency with the rest of the font names.
3736 
Changes cour/courb/courbi/couri to ncrr/ncrb/ncrbi/ncri likewise.
3737 
 
3738 
Replaces the Charter fonts with the CharterBT fonts donated by
3739 
Bitstream to the X11R5 distribution.
3740 
 
3741 
Adds font aliasing capability to Fontmap.  Replaces
3742 
Courier-[Bold]Oblique and ZapfChancery-MediumItalic by aliases.
3743 
 
3744 
Changes the FontBBox of the Hershey fonts to be an executable, rather
3745 
than a literal, array.
3746 
 
3747 
</pre><h3><a name="V2.4.2_Drivers"></a>Drivers</h3><pre>
3748 
Fixes bugs:
3749 
	- The GIF driver omitted a `private' on the definition of
3750 
gif_print_page.
3751 
	- The GIF driver wrote 16-bit values using the byte ordering
3752 
of the platform, rather than always LSB first.
3753 
	- George Cameron's DeskJet 500C driver had an incorrect
3754 
control sequence for skipping blank lines.
3755 
 
3756 
Adds 'const' in many places, including the tile and bitmap arguments
3757 
of the tile_rectangle, copy_mono, and copy_color driver routines.
3758 
THIS IS A DRIVER INTERFACE CHANGE.  (Printer drivers are not
3759 
affected, since they don't implement these routines.)
3760 
 
3761 
Adds a driver for the Trident TVGA.
3762 
 
3763 
</pre><h3><a name="V2.4.2_Interpreter"></a>Interpreter</h3><pre>
3764 
Fixes bugs:
3765 
	- alloc_free sometimes incorrectly chose to put an unaligned
3766 
block in an old segment on a freelist.
3767 
	- The default undercolor removal function returned its
3768 
argument rather than returning 0.
3769 
 
3770 
Adds NullEncode and SubFileDecode to the standard filters, since
3771 
bdftops uses the latter.
3772 
 
3773 
Adds RunLengthEncode and RunLengthDecode to the optional filters.
3774 
 
3775 
Removes the type1imagepath operator.  (It is still available as
3776 
PostScript code, impath.ps.)  Replaces it with a simpler outline
3777 
tracing operator .imagepath.
3778 
 
3779 
Adds 'const' in many places.
3780 
 
3781 
Makes fileposition (but not setfileposition) legal for NullEncode
3782 
filters.
3783 
 
3784 
Changes the default transfer function for high-resolution devices
3785 
from the identity function to the square root function.
3786 
 
3787 
Moves array_get from zgeneric.c to iutil.c.
3788 
 
3789 
Changes uses of fopen to add a "b" to the access mode, rather than
3790 
relying on the _fmode global variable on MS-DOS platforms.
3791 
 
3792 
Allows use of the -Z switch even when gsmain.c wasn't compiled with
3793 
-DDEBUG, since other modules might have been.
3794 
 
3795 
Reorganizes gs.c and gsmain.c so that the latter can be used in
3796 
server environments.
3797 
 
3798 
Replaces all uses of stdin/out/err with gs_stdin/out/err.
3799 
 
3800 
Makes the number of permanent entries on the dictionary stack a
3801 
parameter, to allow inserting globaldict in the future.
3802 
 
3803 
Changes BlueShift in the Type 1 font Private dictionary to allow real
3804 
numbers.  (This differs from the Adobe specification, but at least
3805 
one commercial font has a real number for BlueShift.)
3806 
 
3807 
</pre><h3><a name="V2.4.2_Library"></a>Library</h3><pre>
3808 
Fixes bugs:
3809 
	- The doubling check in init_ht (gxht.c) still sometimes
3810 
thought there was enough room to double the tile when there actually
3811 
wasn't.
3812 
	- Rotated halftone screens didn't work.
3813 
	- gxarith.h used #ifdef vax, rather than #if
3814 
!arch_floats_are_IEEE, to test whether IEEE floats were being used.
3815 
	- pathforall didn't report a trailing moveto.
3816 
 
3817 
Replaces gs_type1imagepath with gs_imagepath.
3818 
 
3819 
Allows sOUTPUTFILE=-, meaning output to stdout.
3820 
 
3821 
Adds 'const' in many places.
3822 
 
3823 
Replaces all uses of stdin/out/err with gs_stdin/out/err.
3824 
 
3825 
</pre>
3826 
 
3827 
<h2><a name="Version2.4.1"></a>Version 2.4.1 (4/21/92)</h2>
3828 
 
3829 
<p>This is a quick release to fix minor problems discovered in 2.4, and
3830 
to add a few improvements that didn't quite make it into 2.4.  It
3831 
also adds GIF and PCX file support.
3832 
 
3833 
<h3><a name="V2.4.1_Procedures"></a>Procedures</h3><pre>
3834 
Fixes bugs:
3835 
	- Some makefile dependencies, and the ccgs script, caused trouble
3836 
for parallel versions of `make'.
3837 
	- Compiling genarch with -O with gcc on the RS/6000 produced a
3838 
buggy executable.
3839 
 
3840 
Fixes some minor problems in make.doc.
3841 
 
3842 
Adds DEVICE_DEVS2..5 to handle long device lists.
3843 
 
3844 
Removes the need to set GS_RUN_EXE when using the Watcom compiler on
3845 
MS-DOS systems.
3846 
 
3847 
Gets rid of gs_ccfnt.ps, merging its function into gs_fonts.ps.
3848 
 
3849 
Gets rid of gconfig.ps; this information is now compiled in gconfig.c.
3850 
 
3851 
</pre><h3><a name="V2.4.1_Utilities"></a>Utilities</h3><pre>
3852 
Fixes bugs:
3853 
	- The palette for pstoppm in 8-bit mode didn't contain all 8
3854 
primary colors.
3855 
	- font2c used just values_ to mean &amp;values_[0]; some compilers
3856 
couldn't handle this.
3857 
 
3858 
Makes font2c insert `const' in many appropriate places.
3859 
 
3860 
</pre><h3><a name="V2.4.1_Drivers"></a>Drivers</h3><pre>
3861 
Fixes bugs:
3862 
	- The SunView driver had not been updated properly for 2.4 and was
3863 
pretty thoroughly broken.
3864 
	- None of the printer drivers worked properly with the Watcom
3865 
compiler, because stdprn was doing \n -&gt; \r\n substitution.
3866 
	- If the generic printer driver couldn't allocate the requested
3867 
size command list buffer, it gave up rather than trying to allocate a
3868 
smaller buffer.
3869 
	- The SuperVGA drivers (except for the VESA driver) didn't
3870 
work with the Watcom compiler, because a couple of places in the
3871 
drivers weren't truncating the offset of "segmented" pointers
3872 
properly.
3873 
	- Some of the H-P used &lt;esc&gt;*b#Y rather than &lt;esc&gt;*p+#Y for
3874 
vertical positioning; this apparently is wrong, at least for the
3875 
LJIIp.
3876 
 
3877 
Removes the dependence of the X Windows driver on Xt, Xext, and Xmu.  As a
3878 
result, Ghostscript will not install a standard colormap itself, but it
3879 
will use one if one is already installed.
3880 
 
3881 
Adds a set of drivers for Portable Bitmap, Graymap, and Pixmap file
3882 
formats.
3883 
 
3884 
Adds drivers for monochrome, EGA/VGA-style, and SuperVGA-style PCX
3885 
file formats.
3886 
 
3887 
Adds drivers for monochrome and 256-color GIF file formats.
3888 
 
3889 
</pre><h3><a name="V2.4.1_Fonts"></a>Fonts</h3><pre>
3890 
Adds ZapfChancery-MediumItalic as a copy of ZapfChancery-Oblique.
3891 
 
3892 
</pre><h3><a name="V2.4.1_Interpreter"></a>Interpreter</h3><pre>
3893 
Fixes bugs:
3894 
	- A value with l_new set could 'escape' to save level 0 on a
3895 
stack; if stored, it prevented the slot from being saved and restored
3896 
properly.
3897 
	- 16#7fffffff + 1 gave the floating point equivalent of -2^31, not
3898 
2^31.
3899 
	- The PFBDecode filter computed the packet length incorrectly if
3900 
the 0x8000-bit of the length was set.
3901 
	- 5-byte numbers in Type 1 CharStrings complained of a rangecheck
3902 
if they exceeded 16 bits, rather than if they exceeded the integer part of
3903 
a fixed.
3904 
	- (, ), and \ appearing in file name arguments in the command
3905 
line did not work properly.
3906 
 
3907 
Adds 'const' in many places.
3908 
 
3909 
Changes the random number generator to be the same as the one used in
3910 
Level 2 PostScript (as reported by Ed Taft on comp.lang.postscript).
3911 
 
3912 
Exits with code 1 rather than code 0 on an unrecoverable error detected at
3913 
the PostScript level.
3914 
 
3915 
Makes dictionaries expand automatically when they fill up.
3916 
 
3917 
Adds gp_exit to complement gp_init.
3918 
 
3919 
Changes dictionaries to always allocate a power of 2 entries on
3920 
32-bit machines.  Changes the name table to allocate indices
3921 
scattered, so dictionary lookup doesn't have to do a multiply to
3922 
scramble the index.
3923 
 
3924 
Changes the handling of currentfile to do "shallow binding" so stack
3925 
searching is almost never required.
3926 
 
3927 
</pre><h3><a name="V2.4.1_Library"></a>Library</h3><pre>
3928 
Fixes bugs:
3929 
	- arc and arcn got a numeric exception if the radius was zero.
3930 
	- The undocumented 15 opcode in Type 1 fonts wasn't ignored.
3931 
	- PaintType 3 wasn't allowed.  (It isn't clear what it should
3932 
mean; we treat it as equivalent to 0.)
3933 
	- The VAX/VMS C compiler was generating incorrect code for the
3934 
chi_bits and cmask macros in gdevmem, producing incorrect output.
3935 
	- If the result of the slow algorithm for intersecting clipping
3936 
paths was a rectangle, the wrong thing happened (cbox didn't get set).
3937 
	- gx_path_is_rectangle didn't recognize open rectangles.
3938 
	- clist_change_tile didn't check properly whether the tile
3939 
size had changed, so changing the screen could produce invalid band
3940 
files.
3941 
	- The image operators did the wrong thing in the 1-for-1
3942 
case, interleaving N bytes of data with 7*N bytes of garbage.
3943 
	- stroke sometimes handled bevel and miter joins wrong in
3944 
reflected coordinate systems.
3945 
	- init_ht checked incorrectly whether there was enough room
3946 
to Y-replicate tiles, so sometimes it did it when it shouldn't have.
3947 
	- stroke sometimes thought lines were thin when they weren't.
3948 
 
3949 
Adds 'const' in many places.
3950 
 
3951 
Adds support for 2- and 4-bit-per-pixel memory devices.
3952 
 
3953 
</pre>
3954 
 
3955 
<h2><a name="Version2.4"></a>Version 2.4 (3/25/92)</h2>
3956 
 
3957 
<p>This is a major release that adds SuperVGA support, support for
3958 
Metrics,
3959 
settable device properties, and incremental font loading.  It also
3960 
includes important performance improvements, based on rewrites of some key
3961 
algorithms, and quite a few new Level 2 / Display PostScript facilities.
3962 
 
3963 
<h3><a name="V2.4_Procedures"></a>Procedures</h3><pre>
3964 
Fixes bugs:
3965 
	- The rule for compiling gconfig.c didn't include the -I switches.
3966 
	- .bat files were being distributed with a \n line terminator
3967 
rather than \r\n.
3968 
	- A CLOSE MODULE_LIST was needed after END_COMPILE: in the VMS
3969 
command files.
3970 
	- Unix systems couldn't handle multiple drivers with overlapping
3971 
sets of files.
3972 
	- -s&lt;name&gt; defined &lt;name&gt; as a null, rather than as an empty string.
3973 
 
3974 
Adds gconfig.ps to the list of needed configuration files.
3975 
 
3976 
Changes the way that the makefile handles nested .h files, so that it
3977 
doesn't have to `touch' them.
3978 
 
3979 
Adds the loadallfonts procedure to gs_fonts.ps.
3980 
 
3981 
Changes the standard DOS configuration to include VGA, EGA, VESA, Epson,
3982 
BubbleJet, and H-P printer drivers.
3983 
 
3984 
Renames ghost.mak as gs.mak, and gdevs.mak as devs.mak.
3985 
 
3986 
Adds a USE_ASM flag so that one can build a DOS version of Ghostscript
3987 
without having an assembler.
3988 
 
3989 
Splits off common code from the two MS-DOS makefiles into tccommon.mak.
3990 
 
3991 
Replaces the COPYING and LICENSE files with a new LICENSE file containing
3992 
version 2 of the GNU General Public License.
3993 
 
3994 
Removes DEVICES and DEVICE_OBJS from the makefiles, since they are no
3995 
longer needed.
3996 
 
3997 
Adds a GS_DEVICE environment variable to supply a default device name if
3998 
desired.
3999 
 
4000 
Adds ansihead.mak and unix-ansi.mak, to parallel [g]cc-head.mak and
4001 
unix-[g]cc.mak, for other ANSI C compilers.
4002 
 
4003 
Changes the way that optional features are defined in the makefiles, so
4004 
that they actually work.
4005 
 
4006 
Adds support for the Watcom C/386 compiler.
4007 
 
4008 
Allows # in the command line as equivalent to =, to compensate for
4009 
brain-damaged MS-DOS shell.
4010 
 
4011 
Adds -sOUTPUTFILE= to set the output file or pipe.
4012 
 
4013 
Adds -dWRITESYSTEMDICT to leave systemdict writable.
4014 
 
4015 
</pre><h3><a name="V2.4_Utilities"></a>Utilities</h3><pre>
4016 
Fixes bugs:
4017 
	- pcharstr.ps insisted on having Subrs be present in the font.
4018 
	- pcharstr.ps decoded negative numbers between -108 and -1131
4019 
incorrectly.
4020 
	- pfbtogs.ps didn't handle packets longer than 64K correctly.
4021 
 
4022 
Changes the bdftops utility so that it makes entries for UnderlinePosition
4023 
and UnderlineThickness in FontInfo, and so that it always records a
4024 
FullName (the FontName if no other is provided).
4025 
 
4026 
Changes the name of the pfbtops utility to pfbtogs, because groff already
4027 
includes a program called pfbtops.
4028 
 
4029 
Adds the gslp utility for doing "line printing" of text files, similar to
4030 
enscript + lpr.
4031 
 
4032 
Adds a new variable DITHERPPI that enables a different dither pattern,
4033 
claimed to be better for printers.
4034 
 
4035 
Adds the font2c utility for compiling Type 1 fonts into C, so they can be
4036 
linked into an executable rather than loaded dynamically.
4037 
 
4038 
</pre><h3><a name="V2.4_Drivers"></a>Drivers</h3><pre>
4039 
Fixes bugs:
4040 
	- gdev_prn_copy_scan_lines was erroneously masking the last byte
4041 
of data even on color printers, as was paintjet_print_page.
4042 
	- The TruFax driver had a couple of compilation errors, since it
4043 
hadn't been compiled in a while.
4044 
	- The BGI driver sometimes didn't consult BGIPATH when looking for
4045 
.BGI files.
4046 
	- initclip did the wrong thing with memory devices.
4047 
	- The BGI driver didn't look in BGIDIR for .BGI files.
4048 
	- The Epson driver didn't set the right margin properly with
4049 
ESC+Q.
4050 
	- The BJ-10e driver was badly broken.
4051 
	- gdev_prn_open/close_printer didn't reset the command list file,
4052 
so it was taking quadratic time to print multi-page documents.
4053 
 
4054 
Adds color to the SunView driver.
4055 
 
4056 
Adds selectable resolution (75, 100, 150, or 300 DPI) to the
4057 
DeskJet/LaserJet driver.
4058 
 
4059 
Changes gssetdev so that drivers can specify special libraries to be
4060 
loaded, as well as object files.
4061 
 
4062 
Adds a driver for VESA-compliant SuperVGA displays.  This driver handles
4063 
all resolutions from 640 x 400 up to 1280 x 1024, in 256-color mode.  The
4064 
default is VGA resolution (640 x 480).
4065 
 
4066 
Adds a driver for the ATI Wonder SuperVGA card, and for SuperVGA cards
4067 
using the Tseng Labs ET3000 or ET4000 chip such as the STB VGA EM-16 and
4068 
the Orchid ProDesigner II (256-color modes only).
4069 
 
4070 
Adds a driver for Trident and Tseng Labs SuperVGA cards in 800 x 600,
4071 
16-color modes (for cards with only 256K of memory).
4072 
 
4073 
Adds user-contributed drivers for the Ricoh 4081, DEC LN03, Canon LBP-8II,
4074 
and H-P DeskJet 500C printers.
4075 
 
4076 
Adds Tim Theisen's Ghostview changes to the X11 driver.
4077 
 
4078 
MAKES NON-BACKWARD-COMPATIBLE CHANGES TO THE DRIVER PROCEDURE INTERFACE as
4079 
follows:
4080 
 
4081 
	- Changes map_rgb_color and map_color_rgb to always work in a
4082 
	    16-bit color value space, rather than a space defined by the
4083 
	    maximum number of distinct colors provided by the device.
4084 
 
4085 
	- Adds an argument to the output_page procedure to indicate
4086 
	    whether the procedure is being called for copypage or
4087 
	    showpage, and a num_copies argument.
4088 
 
4089 
	- Adds a gx_bitmap_id to the copy_ and tile_ procedures, so that
4090 
	    drivers can cache bitmaps in the server or device if they want
4091 
	    to.
4092 
 
4093 
	- Removes fill_trapezoid and tile_trapezoid.
4094 
 
4095 
	- Adds a new get_bits procedure for reading the bits back from the
4096 
	    driver buffer (when possible), replacing copy_scan_lines.
4097 
	    This procedure takes a new argument describing padding and
4098 
	    byte swapping, and returns a different value from
4099 
	    copy_scan_lines.
4100 
 
4101 
	- Adds get_props and put_props procedures for accessing arbitrary
4102 
	    additional properties of devices.  The interface is quite
4103 
	    complex, but provides a great deal of flexibility.
4104 
 
4105 
See drivers.doc for details.
4106 
 
4107 
Changes gdev_mem_bytes_per_scan_line to gdev_prn_bytes_per_scan_line.
4108 
 
4109 
Adds a user-contributed driver for DigiBoard, Inc.'s fax software.
4110 
 
4111 
</pre><h3><a name="V2.4_Fonts"></a>Fonts</h3>
4112 
 
4113 
<pre>
4114 
Changes Type1BuildChar so it uses the information from the Metrics
4115 
dictionary in the font, if Metrics is present.
4116 
 
4117 
Changes findfont (.loadfont) so it recognizes .PFB fonts and can load them
4118 
directly.  Also changes .loadfont to disable packing temporarily, because
4119 
some fonts rely on procedures being writable (!).
4120 
 
4121 
</pre><h3><a name="V2.4_Interpreter"></a>Interpreter</h3><pre>
4122 
Fixes bugs:
4123 
	- The hypot function is not available on some Unix systems.
4124 
	- Ghostscript didn't flush and close files when exiting.
4125 
	- In statusdict, the /margins procedure used .leftmargin, but
4126 
/setmargins used .lmargin.
4127 
	- An out-of-range putinterval would simply do nothing, rather than
4128 
reporting an error.
4129 
	- If an attempt to allocate a block larger than the allocator's
4130 
chunk size (20K) failed, the allocator would erroneously think it had
4131 
succeeded.
4132 
	- The bind operator made the top-level procedure read-only, as
4133 
well as interior procedures.
4134 
	- gs.c copied 1 extra character for the value of strings defined
4135 
on the command line with -s...=, which could smash the first byte of the
4136 
next object in memory.
4137 
	- copying a dictionary erroneously required the maxlength of the
4138 
destination to be greater than or equal to the maxlength of the source,
4139 
rather than the length of the source.
4140 
	- undef didn't correctly decide when to mark a deleted entry as
4141 
deleted vs. free; as a result, some keys couldn't be looked up properly
4142 
after an undef.
4143 
	- type1encrypt and type1decrypt didn't set the size of the result
4144 
properly.
4145 
	- cvi and cvr didn't allow leading or trailing whitespace in
4146 
strings.
4147 
	- cvs didn't cause an error if the destination string was too
4148 
short.
4149 
	- Many operators didn't check correctly for stack underflow (off
4150 
by 1).
4151 
	- `for' used reals, rather than integers, if the limit was a real,
4152 
even if the initial value and increment were integers.
4153 
	- `restore' didn't properly invalidate copies of the save object
4154 
being restored from; `save dup restore restore' would crash.
4155 
	- `restore' sometimes didn't undo stores into matrices that were
4156 
stored into by operators.  (The identity matrix always had l_new set.)
4157 
	- readline gave a rangecheck if the input line exactly filled the
4158 
string.
4159 
	- `--' as the last switch on the command line caused a crash
4160 
rather than an error message.
4161 
	- On MS-DOS systems, filenameforall didn't handle patterns with a
4162 
drive or directory specifier properly.
4163 
	- stroke sometimes called gz_draw_line_fixed even if the line went
4164 
outside the clipping box by 1 pixel.
4165 
 
4166 
Changes the loop that binds procedure "operators" to entirely disable the
4167 
handling of the typecheck error, rather than to use stopped.  This cuts
4168 
initialization time significantly, and also eliminates about 35K of wasted
4169 
space (for saving the stacks).
4170 
 
4171 
Changes the version "operator" so it returns 47.0.  Adds "revision" to
4172 
define the Ghostscript version # x 100.
4173 
 
4174 
Adds gscurrentresolution and gssetresolution procedures for getting and
4175 
setting the device resolution.
4176 
 
4177 
Adds -r&lt;res&gt; and -r&lt;xres&gt;x&lt;yres&gt; as command line options for setting
4178 
device resolution.
4179 
 
4180 
Adds a facility for incrementally loading the individual CharStrings of a
4181 
Ghostscript font from the disk.  This can save a lot of memory, at the
4182 
expense of slower rendering.  (It is intended primarily for MS-DOS
4183 
systems.)
4184 
 
4185 
Changes findlibfile to return the name of the file that was actually
4186 
opened, as well as the file itself, when the operation succeeds.
4187 
 
4188 
Changes the name of the main entry to the interpreter from interpret to
4189 
gs_interpret, because of a conflict with a Data General library procedure.
4190 
 
4191 
Adds the .setmetrics operator to set the metrics for the current
4192 
character for Type 1 fonts.
4193 
 
4194 
Adds more LaserWriter-specific entries to statusdict.
4195 
 
4196 
Gives names to all the internal `operators', so they will print out
4197 
reasonably when an error occurs.
4198 
 
4199 
Extends the status operator to accept a string and return file
4200 
information, as defined for Level 2 PostScript.
4201 
 
4202 
Adds the filter operator and some specific filters: ASCII85Encode,
4203 
ASCII85Decode, ASCIIHexEncode, ASCIIHexDecode, eexecDecode, NullEncode,
4204 
PFBDecode, and the null case of SubFileDecode.
4205 
 
4206 
Extends the scanner to recognize the Level 2 &lt;&lt; and &gt;&gt; tokens.
4207 
 
4208 
Adds a facility for extracting the text strings from a PostScript file and
4209 
writing them out in a simple format (selected by -dASCIIOUT, implemented
4210 
by gs_2asc.ps).
4211 
 
4212 
Implements all of the remaining Display PostScript facilities that are
4213 
also in Level 2 (i.e., everything in section A.1.3 of the PostScript
4214 
Language Reference Manual, Second Edition, that is not also in section
4215 
A.1.2).  The virtual memory operations are all stubs; the new halftone
4216 
options are not fully implemented.
4217 
 
4218 
Changes makeimagedevice to use a string of gray or RGB values, rather than
4219 
an array of color objects, to specify the palette.  Removes
4220 
currentgscolor and setgscolor from the interpreter, but leaves t_color
4221 
objects in, since they may be useful later.
4222 
 
4223 
Adds getdeviceprops and putdeviceprops for manipulating device properties.
4224 
Currently defined properties for all devices: InitialMatrix, HWResolution,
4225 
HWSize, Name.  Currently defined properties for printers: BufferSpace,
4226 
MaxBitmap, OutputFile.  OutputFile allows |command for piping on Unix
4227 
systems.
4228 
 
4229 
Removes deviceparams and makedevice.  Adds devicedefaultmatrix.
4230 
 
4231 
Implements reversepath.
4232 
 
4233 
Makes copy work on devices.
4234 
 
4235 
MS-DOS specific
4236 
- - - - - - - -
4237 
 
4238 
Fixes bugs:
4239 
	- iutilasm.asm wouldn't assemble with newer versions of MASM if
4240 
CPU_TYPE was set to 286 or above.
4241 
	- CPU_TYPE=386 didn't properly substitute the faster
4242 
multiply/divide routines under Turbo C++ or Borland C++, only under the
4243 
original Turbo C.
4244 
 
4245 
</pre><h3><a name="V2.4_Library"></a>Library</h3><pre>
4246 
Fixes bugs:
4247 
	- A curve whose first and last points were the same wouldn't get
4248 
drawn at all.
4249 
	- A bug in the Turbo C++ compiler generated bad code when shifting
4250 
a long right by 1 bit.
4251 
	- If stroking a dashed line ever encountered a segment that was
4252 
completely blank, Ghostscript would indirect through a null pointer.
4253 
	- arc and arcn gave an error if the radius was negative.
4254 
	- stroke always used the general algorithm, even if the line was
4255 
guaranteed to be thin.
4256 
	- arc and arcn erroneously reduced the angles mod 360.
4257 
	- Very large or negative 32-bit numbers in Type 1 fonts didn't
4258 
work properly on MS-DOS systems (the ff0000 bits got set to zero).
4259 
	- Color printer devices rendering entirely in memory only
4260 
allocated a monochrome-sized bitmap.
4261 
	- clip and eoclip didn't intersect the paths properly in the
4262 
general case.
4263 
	- charpath erroneously rounded the current point to an integral
4264 
value, causing characters to be spaced improperly.
4265 
	- The definition of max_color_param got some compilers confused.
4266 
	- charpath always used quadratic time and space, and dropped all
4267 
but the last character when used with a Type 3 font.
4268 
	- Stroking a path with a 180 degree angle would incorrectly miter
4269 
instead of beveling.
4270 
	- Type 1 fonts used the current flatness for curves, which could
4271 
produce bad (and inconsistent) results.
4272 
	- Stroking a degenerate line segment produced incorrect results.
4273 
 
4274 
Changes the character cache to use the UniqueID as the key, when
4275 
available, instead of the font pointer.  This dramatically improves
4276 
performance when fonts are getting removed and reloaded because of page
4277 
isolation with save/restore.
4278 
 
4279 
Removes some unnecessary casts to (float) from gsmatrix.c and gscoord.c.
4280 
 
4281 
Changes the Type 1 interpreter so that it rounds line and curve endpoints
4282 
to the center of the nearest half-pixel, and omits null line segments.
4283 
This both speeds up rendering at small sizes and improves output quality.
4284 
 
4285 
Changes gs_deviceparams to return resolution as well as extent; changes
4286 
gs_makedevice to accept resolution as well as extent.
4287 
 
4288 
Replaces the algorithm for approximating circular arcs with curves with a
4289 
more accurate one.
4290 
 
4291 
Changes gs_point and gs_rect to use doubles rather than floats.
4292 
 
4293 
Adds gs_setmetrics, for overriding Type 1 font metrics for the current
4294 
character.
4295 
 
4296 
Changes clipping to use lists of rectangles rather than path intersection.
4297 
 This makes a big difference when clipping bitmaps (including characters).
4298 
 
4299 
Changes the character cache to discard entries incrementally, rather than
4300 
clearing the entire cache when it fills up.
4301 
 
4302 
Changes the implementation of transfer functions to use a cached map,
4303 
built when the transfer function is set.  This makes transfer functions
4304 
work properly in all situations, including images.
4305 
 
4306 
Defines a .quit operator that takes an exit code, and redefines quit in
4307 
terms of it.
4308 
 
4309 
Adds support for 16-bit-per-pixel devices in gdevmem.
4310 
 
4311 
Adds gs_copydevice and gs_deviceinitialmatrix; removes gs_deviceparams and
4312 
gs_makedevice.
4313 
 
4314 
Changes setscreen to ensure that the cell is always at least 4x4 pixels in
4315 
size.
4316 
 
4317 
</pre>
4318 
 
4319 
<h2><a name="Version2.3"></a>Version 2.3 (8/28/91)</h2>
4320 
 
4321 
<p>This is a minor release to fix two bugs and add the PaintJet driver,
4322 
which
4323 
didn't make it into 2.2.
4324 
 
4325 
<h3><a name="V2.3_Utilities"></a>Utilities</h3><pre>
4326 
Changes the pstoppm utility so it counts pages correctly even in the
4327 
presence of arbitrary saves and restores.
4328 
 
4329 
</pre><h3><a name="V2.3_Drivers"></a>Drivers</h3><pre>
4330 
Adds a new, "supported" PaintJet driver.
4331 
 
4332 
Changes the Epson driver to use ESC+D rather than ESC+\ for horizontal
4333 
positioning, since many printers don't support the latter.
4334 
 
4335 
Adds horizontal double-density (two-pass) printing to the Epson driver, so
4336 
it can do 240 x 60 and 360 x 180 densities.  (Vertical double density is
4337 
not supported yet.)
4338 
 
4339 
</pre>
4340 
 
4341 
<hr>
4342 
 
4343 
<h2><a name="Version2.2"></a>Version 2.2 (6/1/91)</h2>
4344 
 
4345 
<p>
4346 
The purpose of this release is to add save/restore, and a few
4347 
miscellaneous Level 2 P*stScr*pt features such as undef.  It also includes
4348 
major improvements in graphics quality and in handling of high-resolution
4349 
printers.
4350 
 
4351 
<h3><a name="V2.2_Procedures"></a>Procedures</h3><pre>
4352 
Changes the version numbering to M.mpp rather than M.m.p, so that
4353 
`version' can be a real number for those programs that insist on it.
4354 
 
4355 
Renames ghost.ps as gs_init.ps, gfonts.ps as gs_fonts.ps, and statusd.ps
4356 
as gs_statd.ps.  The initialization files now all are named gs_*.ps.
4357 
 
4358 
Renames gdevs.{c,h,tl} as gconfig.{c,h,tl}.
4359 
 
4360 
Changes the relevant makefiles and command files so that a single build
4361 
can contain several drivers that share code, e.g., the Epson driver and
4362 
the DeskJet driver.
4363 
 
4364 
Changes gs_init.ps so it relies on an external gconfig.ps file rather than
4365 
making a specific test for the presence of Level 2 features.
4366 
 
4367 
Adds an entry for uglyr.gsf to the makefile.
4368 
 
4369 
Removes the distinction between CCA and CCNA, since most of the files now
4370 
contain constructs that require non-ANSI compilation on MS-DOS platforms.
4371 
 
4372 
Adds a `man' page for the ansi2knr utility.
4373 
 
4374 
Changes the documentation (use.doc) to show how to use -sDEVICE=&lt;device&gt;,
4375 
or the selectdevice procedure, to select devices by name.
4376 
 
4377 
Adds DEVICE_DEVS to the makefiles (analogous to DEVICES and DEVICE_OBJS).
4378 
This finally makes the make procedure fully automatic.
4379 
 
4380 
Adds the name of the initialization file (gs_init.ps) as a
4381 
platform-specific makefile parameter, GS_INIT.
4382 
 
4383 
Removes the test program gt.{c,tr} from the fileset, since it is not
4384 
useful to users.
4385 
 
4386 
Moves the Symbol encoding vector to a separate file (symbol_e.ps), from
4387 
which it is loaded when first used.
4388 
 
4389 
Changes the error handler so it can handle errors that occur while reading
4390 
the initialization files.
4391 
 
4392 
Extends ansi2knr so it can handle `void' and `...' in parameter lists.
4393 
 
4394 
Adds quit.ps to the set of installed files.
4395 
 
4396 
MS-DOS-specific changes
4397 
- - - - - - - - - - - -
4398 
 
4399 
Adds the VGA and BGI drivers to the standard MS-DOS configuration, and
4400 
makes VGA the default.
4401 
 
4402 
Adds a `+' and a newline at the end of gs.tr, to avoid problems with file
4403 
transfer programs or editors that add a newline at the end of files.
4404 
 
4405 
Changes the name of msdos.mak to turboc.mak, and creates a new tbcplus.mak
4406 
makefile for use with Turbo C++ and Borland C++.
4407 
 
4408 
Changes the extension of the loader response files from .tl to .tr.
4409 
 
4410 
Changes the default search path from c:/ghost and c:/ghost/fonts to c:/gs
4411 
and c:/gs/fonts.
4412 
 
4413 
Changes the directory separator from `|' back to ';', since it appears
4414 
that DOS can handle a ; in a command line if it is prefixed with \.
4415 
 
4416 
Unix-specific changes
4417 
- - - - - - - - - - -
4418 
 
4419 
Changes the uses of install in unixtail.mak so they only install a single
4420 
file at a time, which is all that the standard Unix install allows.
4421 
 
4422 
Removes the duplicate files (README/readme, LICENSE/license,
4423 
COPYING/copying, Fontmap/fontmap).
4424 
 
4425 
Changes the ld flags from LDPLAT to LDFLAGS.
4426 
 
4427 
Adds XCFLAGS and XLDFLAGS.  These are concatenated with CFLAGS and LDFLAGS
4428 
respectively.  The intention is that they be set from the `make' command
4429 
line if desired.
4430 
 
4431 
VMS-specific changes
4432 
- - - - - - - - - -
4433 
 
4434 
Repairs the omission of ZPACKED from the VMS build lists.
4435 
 
4436 
</pre>
4437 
 
4438 
<h3><a name="V2.2_Drivers"></a>Drivers</h3><pre>
4439 
Fixes bugs:
4440 
	- The SunView driver produced semi-garbage on little-endian
4441 
platforms (Sun-386i) because it didn't swap the bit order.
4442 
	- The X driver would dump core if it couldn't open the display and
4443 
the DISPLAY environment variable wasn't set.
4444 
	- The X driver relied on white = 0, black = ones in a couple of
4445 
places;
4446 
	- The X driver would return an error, instead of clipping, if
4447 
asked to display outside the window.
4448 
	- The X driver would create inappropriately sized windows, because
4449 
it believed the server's report of the screen resolution.
4450 
 
4451 
Adds Fran Taylor's Private Eye driver to gdevs.mak and the fileset (not
4452 
supported by Aladdin Enterprises).
4453 
 
4454 
Adds Neil Ostroff's TruFax driver to gdevs.mak and the fileset (not
4455 
supported by Aladdin Enterprises).
4456 
 
4457 
Makes the scratch file template for the printer drivers a per-platform
4458 
quantity (gp_scratch_file_name_template).  Puts the default scratch files
4459 
for Unix in /usr/tmp rather than /tmp.
4460 
 
4461 
Changes the SunView driver to prevent the Ghostscript window from being
4462 
destroyed (which badly confuses the interpreter).
4463 
 
4464 
Extends the Epson driver to handle a variety of print densities in both X
4465 
and Y, to handle 24-pin as well as 8-pin graphics, and to allow optional
4466 
specification of default density in the makefile (gdevs.mak).
4467 
 
4468 
Refactors the printer drivers so that a single driver handles both DeskJet
4469 
and LaserJet.  Adds LaserJet drivers that use the new compression modes on
4470 
the LJ IId/IIp and LJ III.
4471 
 
4472 
Changes all the printer drivers to use band lists rather than bitmap
4473 
paging as the buffering method.  (The individual drivers need only a
4474 
one-line change to replace mem_copy_scan_lines with
4475 
gdev_prn_copy_scan_lines with a different argument.)
4476 
 
4477 
Adds the halftone phase as additional arguments to tile_rectangle and
4478 
tile_trapezoid.
4479 
 
4480 
Adds an entirely new and much simpler PaintJet driver, using the new band
4481 
list interface.
4482 
 
4483 
Adds margin information to the device structure.  This is currently only
4484 
relevant for printer devices.
4485 
 
4486 
Adds BGIPATH and BGIUSER environment variables, allowing additional
4487 
control of the BGI driver.
4488 
 
4489 
Changes the x/y_pixels_per_inch member of the device structure from int to
4490 
float.
4491 
 
4492 
</pre>
4493 
 
4494 
<h3><a name="V2.2_Fonts"></a>Fonts</h3>
4495 
 
4496 
<pre>
4497 
Patches gs_fonts.ps so definefont will add an isFixedPitch entry to
4498 
FontInfo if there isn't one there.
4499 
 
4500 
Removes the old "type 7 path" encoding code from gs_fonts.ps.
4501 
 
4502 
Changes bdftops so it puts isFixedWidth and ItalicAngle entries in the
4503 
FontInfo dictionary of the fonts it creates, since some P*stScr*pt
4504 
programs rely on this.
4505 
 
4506 
Changes bdftops so it synthesizes as many missing characters as possible
4507 
out of the ones that are there (in particular: synthesizes accents out of
4508 
punctuation marks, and accented characters using seac.)  The results
4509 
aren't all that good, but they're a lot better than having characters
4510 
missing out of the font.
4511 
 
4512 
</pre><h3><a name="V2.2_Utilities"></a>Utilities</h3><pre>
4513 
Adds a pfbtops utility for converting .PFB fonts to standard Ghostscript
4514 
fonts.
4515 
 
4516 
Fixes bugs:
4517 
	- ps2image didn't reset things properly between pages for
4518 
multi-page documents.
4519 
 
4520 
</pre><h3><a name="V2.2_Interpreter"></a>Interpreter</h3><pre>
4521 
Makes Ghostscript recognize `-' alone as meaning that it should read from
4522 
standard input as though it were a file.  This allows Ghostscript to
4523 
accept a pipe as input.
4524 
 
4525 
Fixes bugs:
4526 
	- seac in type1addpath used the current font's encoding, not
4527 
StandardEncoding.
4528 
	- type1decryptfile (eexec) didn't recognize binary (as opposed to
4529 
hex) representation.
4530 
	- Mentioning a name whose value was a no-access object caused an
4531 
invalidaccess error.
4532 
	- There was a bogus definition of `run' in zfile.c.
4533 
	- The interpreter didn't handle end-of-file on stdin properly.
4534 
	- Real numbers with an 'e' or 'E' but no decimal point were not
4535 
recognized.
4536 
	- On MS-DOS systems, inside strings, \ followed by a newline was
4537 
not discarded properly.
4538 
	- On MS-DOS systems, the long unsigned divide routine sometimes
4539 
gave incorrect answers.  Among other things, this caused alternate-radix
4540 
numbers sometimes to crash the interpreter.
4541 
	- cvrs didn't do the right thing about reals or negative integers.
4542 
	- .echo.mode was being reset with def instead of store, and was
4543 
defined in systemdict rather than userdict.
4544 
	- setgray and settransfer didn't interact properly.
4545 
	- 16#80000000 was being interpreted as a signed integer (and
4546 
converted to a real) rather than an unsigned one.
4547 
	- atan returned 0 sometimes when it should have returned 180.
4548 
	- currentcmykcolor was defined wrong.
4549 
 
4550 
Removes the filename operator, since no standard Ghostscript code used it,
4551 
and it caused problems with some P*stScr*pt files.
4552 
 
4553 
Implements new operators: filenameforall, selectfont (as a procedure),
4554 
stringmatch, undef.
4555 
 
4556 
Adds new standard procedures: selectdevice.
4557 
 
4558 
For MS-DOS, requires that the operand and execution stacks be located in
4559 
the data segment, and uses short pointers to address them.  This produces
4560 
significantly smaller and faster code.  (These changes are not visible to
4561 
users or library clients.)
4562 
 
4563 
Changes the assignment of attribute bits, and adds new bits for
4564 
save/restore and the garbage collector.  Changes many of the macros in
4565 
store.h to support save/restore.  (These changes are not visible to users
4566 
or library clients.)  Implements save and restore.
4567 
 
4568 
Moves type names from gs_init.ps to ghost.h and ztype.c.
4569 
 
4570 
Moves error names from gs_init.ps to errors.h and iinit.c.
4571 
 
4572 
Introduces gp.h as a documented interface to the platform-specific files.
4573 
 
4574 
Adds the -- switch, which allows Ghostscript programs to take arguments
4575 
from the command line.
4576 
 
4577 
Changes many uses of the name `name' to something else, to avoid upsetting
4578 
the Microsoft C compiler.
4579 
 
4580 
Really implements packed arrays -- they took the same amount of space as
4581 
ordinary arrays in previous versions.
4582 
 
4583 
Changes exitserver in serverdict so that it just clears the stacks.  (This
4584 
isn't the correct fix, but it will do as a workaround.)
4585 
 
4586 
Makes many miscellaneous small changes to pacify various compilers.
4587 
 
4588 
Changes gs_fonts.ps so that when "quiet" mode is selected (-q switch),
4589 
Ghostscript doesn't print anything when loading fonts or when substituting
4590 
for undefined characters.
4591 
 
4592 
Defines the name consisting of just a control-D as a no-op, because some
4593 
P*stScr*pt-generating applications put control-Ds in their output.
4594 
 
4595 
Implements halftone phase (sethalftonephase and currenthalftonephase
4596 
operators).
4597 
 
4598 
Removes the -E switch, since it is no longer useful.
4599 
 
4600 
Changes the -w and -h switches to a single -g (geometry) switch, with
4601 
usage -g&lt;width&gt;x&lt;height&gt;.  Makes the -h switch, and a new -? switch, print
4602 
usage help.
4603 
 
4604 
Implements correct handling of stack overflow errors (makes an array out
4605 
of the contents of the overflowing stack, and resets the stack, before
4606 
invoking the error handler).
4607 
 
4608 
Adds t_oparray (`operators' defined as procedures) and the makeoperator
4609 
operator.  This is so that programs like the Distillery that rely on all
4610 
operators being bound by `bind' will work properly.
4611 
 
4612 
Adds a new NOPAUSE flag to suppress the prompt and pause at copypage and
4613 
showpage.
4614 
 
4615 
</pre><h3><a name="V2.2_Library"></a>Library</h3><pre>
4616 
Fixes bugs:
4617 
	- gs_type1_interpret didn't store the encryption state or the skip
4618 
count before returning to let the client handle a seac or an endchar in
4619 
the middle of a seac.
4620 
	- The definition of the Type 1 operator ce_testadd was based on
4621 
wrong information; the operator takes only 2 operands and does something
4622 
unknown.
4623 
	- mem_true24_copy_mono wasn't incrementing the destination pointer
4624 
if the color was transparent, leading to garbled characters.
4625 
	- gx_lookup_fm_pair would sometimes look at one entry beyond the
4626 
end of the cached font/matrix pair area.  (This probably had no practical
4627 
effect.)
4628 
	- gs_type1_interpret didn't save the current point when returning
4629 
to the client for a callothersubr, causing some characters to be rendered
4630 
displaced (such as some of the chess pieces in chess.ps).
4631 
	- gs_setgray, gs_sethsbcolor, gs_setrgbcolor, gs_setflat, and
4632 
gs_setlinewidth gave errors for out-of-range operands rather than forcing
4633 
them into range.
4634 
	- Transfer functions were not actually supported.
4635 
	- The area fill algorithm failed on certain complex paths.
4636 
	- The current point was sometimes defined when a BuildChar
4637 
procedure was called.
4638 
	- Stroking a degenerate line didn't display anything for round
4639 
caps or joins.
4640 
	- If the ends of a curve had exactly the same X coordinate, the
4641 
curve sometimes wouldn't be displayed.
4642 
	- Very thin lines that went outside the clipping region would
4643 
sometimes be displayed as dashed, or not at all.
4644 
	- The translation in a FontMatrix was ignored.
4645 
	- Very wide, shallow lines would color extraneous pixels when
4646 
using bevel or miter joins.
4647 
	- Dashed lines didn't join properly at the beginning of a closed
4648 
path.
4649 
	- 0-degree arcs didn't add the appropriate line (possibly
4650 
degenerate) to the path.
4651 
	- gs_type1_interpret didn't reset the callsubr stack when starting
4652 
the base character of a seac, which caused confusion if the accent's
4653 
endchar fell inside a Subr.
4654 
	- Non-monochrome memory memory devices weren't checking the
4655 
arguments of the drawing procedures properly.
4656 
	- The initial clipping rectangle for memory devices was being
4657 
computed wrong.
4658 
	- Null devices had a semi-infinite clipping rectangle instead of
4659 
an empty one.
4660 
	- gs_setlinewidth was treating negative arguments as zero, instead
4661 
of taking the absolute value.
4662 
	- imagemask with a dithered color used a solid color rather than
4663 
the dithered one.
4664 
 
4665 
Tweaks the area fill and image rendering algorithms to be a little more
4666 
liberal with paint when being used to render characters.
4667 
 
4668 
Changes the name of the 8-bit mapped color memory device from
4669 
mem_mapped_color_device to mem_mapped8_color_device.
4670 
 
4671 
Changes the memory devices so that on little-endian platforms, they can
4672 
store the bytes within a word in either order.  (Little-endian order
4673 
allows efficient 32-bit updating, big-endian is required when displaying
4674 
or writing to a printer or a file.)
4675 
 
4676 
Implements halftone phase.
4677 
 
4678 
Replaces the trapezoid fill algorithm with a much more accurate one
4679 
inspired by a contribution from Paul Haeberli.  This also changes the
4680 
graphics convention back to filling only pixels whose center falls within
4681 
the region to be filled.
4682 
 
4683 
Changes the character cache to allocate headers and bits contiguously out
4684 
of a single ring buffer.
4685 
 
4686 
Changes gs_imagemask and gs_imagemask_init to take a thickness adjustment
4687 
parameter.
4688 
 
4689 
Changes gs_setcachedevice and gs_setcharwidth to take the graphics state
4690 
as a parameter.
4691 
 
4692 
Renames gx_device_memory_bitmap_size as gdev_mem_bitmap_size,
4693 
mem_copy_scan_lines as gdev_mem_copy_scan_lines, and
4694 
mem_bytes_per_scan_line as gdev_mem_bytes_per_scan_line.
4695 
 
4696 
</pre>
4697 
 
4698 
<hr>
4699 
 
4700 
<h2><a name="Version2.1.1"></a>Version 2.1.1 (1/15/91)</h2>
4701 
 
4702 
<p>This is a sub-release distributed to fix a few early bugs in 2.1,
4703 
just in
4704 
time for the new GNU master tape.
4705 
 
4706 
<h3><a name="V2.1.1_Build_procedures"></a>Build procedures</h3><pre>
4707 
Removes all of the (undebugged) Level 2 code from the fileset, as well as
4708 
the (unused) file gdevvga.c.
4709 
 
4710 
Changes the tar file so that the files are stored in the directory
4711 
gs&lt;version&gt; rather than simply gs, e.g., gs211.
4712 
 
4713 
</pre><h3><a name="V2.1.1_Interpreter"></a>Interpreter</h3><pre>
4714 
Changes the scanner so that \ is recognized within strings regardless of
4715 
whether the scanner is reading from a string or from a file.  This is
4716 
compatible with newer P*stScr*pt interpreters, and with the newer
4717 
P*stSc*pt language specification, but not with the older specification in
4718 
the original PostScript Language Reference Manual.
4719 
 
4720 
</pre><h3><a name="V2.1.1_Drivers"></a>Drivers</h3><pre>
4721 
Fixes the max_value macro in gdevmem.c so that compilers won't complain
4722 
about a left shift by 32.
4723 
 
4724 
Adds 'byte' to the list of types that gdevx.c must sidestep because header
4725 
files use them.
4726 
 
4727 
</pre><h3><a name="V2.1.1_Library"></a>Library</h3><pre>
4728 
Changes the computation of penum-&gt;unpack in gsimage.c so as not to upset
4729 
compilers that don't treat procedures and pointers to procedures as
4730 
compatible types for conditional expressions.
4731 
 
4732 
</pre>
4733 
<h2><a name="Version2.1"></a>Version 2.1 (12/31/90)</h2>
4734 
 
4735 
<p>This is primarily a bug fix release to clean up problems in 2.0.  It
4736 
also implements a first cut at the new color operators.
4737 
 
4738 
<h3><a name="V2.1_Build_procedures"></a>Build procedures</h3><pre>
4739 
Changes the separator for multiple directories in MS-DOS from ';' to '|',
4740 
since there is no way to include a ';' in a command line.
4741 
 
4742 
Adds &lt;dir&gt;/fonts to the default search path, where &lt;dir&gt; is c:/ghost for
4743 
MS-DOS systems and `pwd` for Unix systems.
4744 
 
4745 
Adds new documentation describing how to direct output to the printer.
4746 
 
4747 
Changes the PROCTYPE and USE8087 options in MSDOS.MAK to CPU_TYPE and
4748 
FPU_TYPE.  The latter now indicates the type of FPU to generate code for,
4749 
if any.
4750 
 
4751 
</pre>
4752 
 
4753 
<h3><a name="V2.1_Drivers"></a>Drivers</h3>
4754 
 
4755 
<pre>
4756 
Adds a driver for the Canon BubbleJet BJ10e.
4757 
 
4758 
Modifies the EGA driver to handle (non-standard) frame buffers larger than
4759 
64K.  Adds drivers for the VGA and for the EIZO MDB-10 (a 1024 x 768 frame
4760 
buffer).
4761 
 
4762 
Changes the X driver so that it clips to the window dimensions, rather
4763 
than reporting an error.
4764 
 
4765 
Notes that the H-P LaserJet driver, like the DeskJet driver, works under
4766 
Unix as well as MS-DOS.
4767 
 
4768 
Adds support for 120 X DPI mode, and for the LQ-1500, to the Epson driver.
4769 
 
4770 
</pre><h3><a name="V2.1_Fonts"></a>Fonts</h3><pre>
4771 
Fixes bugs in bdftops:
4772 
	- It was using /UniqueId instead of /UniqueID as the key for the
4773 
font unique ID.  This effectively disabled the font cache.
4774 
	- The definition for .notdef was bogus -- an invalid CharString.
4775 
 
4776 
Changes ghost.ps and gfonts.ps so that NullFont is the initial font,
4777 
rather than Ugly.
4778 
 
4779 
Arranges things so that when attempting a font substitution, if the
4780 
default font is not found, NullFont is used instead.
4781 
 
4782 
Extends bdftops so that if certain easily synthesized characters are
4783 
missing from a font, it will attempt to synthesize them using available
4784 
characters.
4785 
 
4786 
</pre><h3><a name="V2.1_Interpreter"></a>Interpreter</h3><pre>
4787 
Extends the -T switch to allow specifying a printf template for the
4788 
arguments of the procedure being traced.
4789 
 
4790 
Fixes bugs:
4791 
	- /0 was interpreted as equivalent to 0 (a number) rather than a
4792 
literal name.
4793 
	- packedarray was defined as being like array, instead of like
4794 
array followed by astore.
4795 
	- Many minor and harmless type mismatches (and a couple of very
4796 
minor genuine bugs) were upsetting the Apollo C compiler.
4797 
	- exp was incorrectly failing in certain cases with a negative
4798 
first argument.
4799 
	- copyscanlines incorrectly required at least 4 elements on the
4800 
operand stack, although it correctly only used the top 3.
4801 
	- readhexstring incorrectly read 1 byte even if the string length
4802 
was zero.
4803 
	- Not every place that expected an array would accept a packed
4804 
array.
4805 
	- Very complex paths (and infrequently other things) could produce
4806 
a 'memory leak'.
4807 
	- / alone would skip following whitespace and gather following
4808 
characters, rather than creating an empty name.
4809 
	- ghost.ps left newerror defined as true in $error, which resulted
4810 
in an erroneous error report if a program executed a 'stop'.
4811 
	- The definition of exitserver in serverdict didn't clear the
4812 
stack.
4813 
	- currentfile returned an executable file, rather than a literal
4814 
one.
4815 
	- setfont for Type 1 fonts didn't check the UniqueID in the font
4816 
dictionary against the one in the font's Private dictionary.
4817 
	- A value stored in a dictionary under the key /xxx couldn't be
4818 
retrieved using the key (xxx), and vice versa.
4819 
	- charpath with a Type 1 font on a string containing a 'space'
4820 
would produce garbage (it released the parent path inappropriately).
4821 
	- bytesavailable did not work properly for terminal input.
4822 
 
4823 
Changes the interface to the memory allocator so that it always takes an
4824 
element size and an element count, like calloc instead of malloc (but note
4825 
that alloc does *not* clear just-allocated blocks).  Gets rid of the
4826 
special 'dynamic' allocation procedures.
4827 
 
4828 
Changes the random number operators to use a better implementation.
4829 
 
4830 
Changes the idiv operator so it will accept any numbers, not just
4831 
integers, as arguments.  (The PostScript manual doesn't allow this, but
4832 
implementations apparently do.)
4833 
 
4834 
Provides semi-fake but usable definitions for all of the color PostScript
4835 
extensions, including a real implementation of colorimage.
4836 
 
4837 
No longer uses the name 'null', which is apparently reserved by Microsoft
4838 
C.  Makes a number of other minor changes required to pacify the Microsoft
4839 
C compiler.
4840 
 
4841 
Implements %statementedit and %lineedit.  (%statementedit is equivalent to
4842 
%lineedit, which is wrong.)  Changes the interactive interpreter to use
4843 
%statementedit.
4844 
 
4845 
Changes the scanner to accept null, ctrl-K (vertical tab), and ctrl-L
4846 
(form feed) as whitespace.  Ctrl-L terminates a comment, null and ctrl-K
4847 
do not.
4848 
 
4849 
Allows a literal string as the 'proc' argument(s) for image, imagemask,
4850 
and colorimage.
4851 
 
4852 
Adds the following operators/procedures: arct, cleardictstack, deletefile,
4853 
renamefile.
4854 
 
4855 
Defines =print as a synonym for =, for the benefit of LaserPrep.
4856 
 
4857 
Implements non-zero PaintType for the show operators (but not for
4858 
charpath) for Type 1 fonts.
4859 
 
4860 
Adds the ISOLatin1Encoding encoding vector.
4861 
 
4862 
Renames currentcolor and setcolor as currentgscolor and setgscolor, to
4863 
avoid conflict with the Level 2 PostScript names.  Removes colorhsb,
4864 
colorrgb, hsbcolor, and rgbcolor.
4865 
 
4866 
</pre><h3><a name="V2.1_Library"></a>Library</h3><pre>
4867 
Fixes bugs:
4868 
	- In a couple of places, a 0 was being passed as a pointer
4869 
argument without casting, which confused the Microsoft C compiler.
4870 
	- Image devices were not recognized properly in debugging
4871 
configurations.
4872 
	- Inverted-color monochrome image devices were not recognized
4873 
properly.
4874 
	- Images that exactly fill the drawing area rendered very slowly,
4875 
because they erroneously used the general clipping algorithm.
4876 
	- Images that are 1-for-1 with the device were incorrectly scaled
4877 
by a factor of 8 in X.
4878 
	- Rounding artifacts sometimes caused characters to be unevenly
4879 
offset vertically by 1 pixel.
4880 
	- Type 1 fonts that used the Flex feature resulted in garbled
4881 
images.
4882 
	- The show operator routines would incorrectly fill or stroke a
4883 
path that existed at the time the show was started.
4884 
	- setscreen truncated the cell size instead of rounding, which
4885 
could produce off-by-1 anomalies.
4886 
	- stroke would sometimes produce garbage (or nothing at all) for
4887 
very narrow lines.
4888 
	- path filling would only color the pixels whose centers fell
4889 
inside the path: the Adobe specification requires coloring a pixel if any
4890 
part of it falls inside the path.
4891 
 
4892 
Changes the Epson printer driver so that it drives the printer directly
4893 
rather than writing to a file.
4894 
 
4895 
Changes pathbbox so that if the path is empty but there is a current
4896 
point, it returns a null rectangle at the current point.
4897 
 
4898 
Changes gs_image_init to take an additional parameter (after bps) giving
4899 
the number of samples per pixel (1, 3, or 4), and an indication of whether
4900 
the samples for each pixel are together or separated (-3 or -4).
4901 
 
4902 
Renames the gs_image_data and gs_imagemask_data procedures as gs_image and
4903 
gs_imagemask, and removes the old versions of the latter.
4904 
 
4905 
Adds gs_colorimage.
4906 
 
4907 
Replaces Snoopy's color dithering algorithm with one contributed by Paul
4908 
Haeberli.
4909 
 
4910 
Changes gs_setgray, gs_[set]hsbcolor, and gs_[set]rgbcolor so that they
4911 
coerce arguments outside the range [0..1] back into the range, instead of
4912 
signalling an error.
4913 
 
4914 
Makes a number of minor changes required to pacify the Microsoft C
4915 
compiler.
4916 
 
4917 
Changes gs_arcto so that if the last argument is a null pointer, the
4918 
tangent points are not returned.
4919 
 
4920 
Removes gs_type1addpath, which is not useful.  (Clients must call
4921 
gs_type1_init and gs_type1_interpret directly.)
4922 
 
4923 
Implements the 'seac' opcode for Type 1 fonts, allowing fonts with accented
4924 
characters to display properly.
4925 
 
4926 
Implements the undocumented 'testadd' opcode for Type 1 fonts, which is
4927 
used by some Adobe fonts.
4928 
 
4929 
Renames gs_currentcolor and gs_setcolor as gs_currentgscolor and
4930 
gs_setgscolor.  Removes gs_colorhsb, gs_colorrgb, gs_hsbcolor, and
4931 
gs_rgbcolor.
4932 
 
4933 
</pre>
4934 
 
4935 
<hr>
4936 
 
4937 
<h2><a name="Version2.0"></a>Version 2.0 (9/12/90)</h2>
4938 
 
4939 
<p>The main purpose of this release is to add fonts, support for
4940 
multiple
4941 
devices, and imaging into memory.  It also fixes a number of miscellaneous
4942 
bugs.  (Unfortunately, accurate records of the bugs fixed are not
4943 
available.)  The changes were so extensive that we chose to increment the
4944 
major version number.
4945 
 
4946 
<h3><a name="V2.0_Miscellaneous"></a>Miscellaneous</h3><pre>
4947 
Doesn't attempt to open the .MAP file on Unix systems.
4948 
 
4949 
Adds mention of statusd.ps to interp.doc.
4950 
 
4951 
Notes that Turbo C 2.0, not 1.5, is required for building the MS-DOS
4952 
version.
4953 
 
4954 
Adds a DEVICES= line to the makefile, and allows multiple devices.
4955 
 
4956 
Documents, in interp.doc, the X Windows resources that Ghostscript
4957 
recognizes.
4958 
 
4959 
Adds three PostScript masters to the fileset: chess.ps (+ cheq.ps),
4960 
golfer.ps, and escher.ps.
4961 
 
4962 
</pre><h3><a name="V2.0_Drivers"></a>Drivers</h3><pre>
4963 
Changes the names of all the device drivers.  See gdevs.mak for the
4964 
updated list.
4965 
 
4966 
Adds a (working) driver for SunView.
4967 
 
4968 
Adds drivers for the Sony NeWS frame buffer, and the Sony Microsystems
4969 
NWP533 printers.  These drivers were contributed by users, so we aren't
4970 
prepared to answer questions about them.
4971 
 
4972 
Adds a driver for the Borland Graphics Interface (BGI) for MS-DOS systems.
4973 
Note that to use this driver with a non-EGA/VGA display, you need a .BGI
4974 
file appropriate for your hardware.  (The Ghostscript executable includes
4975 
the EGA/VGA driver.)
4976 
 
4977 
Adds a driver for Epson printers.  The driver has only been tested on an
4978 
LX-800, and on an H-P DeskJet in FX-80 emulation mode, but may work on
4979 
other models.  The driver could be adapted to work on Unix systems, but as
4980 
distributed, it only works on MS-DOS systems.
4981 
 
4982 
Adds a driver for the Hewlett-Packard DeskJet printer.  The driver could
4983 
be adapted to work on Unix systems, but as distributed, it only works on
4984 
MS-DOS systems.
4985 
 
4986 
The X Windows driver no longer waits for the user to type a character
4987 
before bringing up the initial display.
4988 
 
4989 
Adds information to drivers.doc describing how to change the definition of
4990 
the device structure and procedure table.
4991 
 
4992 
Extends the tile_rectangle and tile_trapezoid driver procedures to
4993 
interpret color0 = color1 = gx_no_color_index as meaning that the tile is
4994 
actually colored, not a mask.
4995 
 
4996 
</pre><h3><a name="V2.0_Build_procedures"></a>Build procedures</h3><pre>
4997 
Changes the tar file so it puts everything in a directory called gs.
4998 
 
4999 
Removes the -ansi switch for gcc (this was causing problems with &lt;math.h&gt;
5000 
on some systems).
5001 
 
5002 
Changes LDPLAT to the string -X, which is appropriate for most Unix
5003 
systems (but not for SunOS 4.n).
5004 
 
5005 
Adds EXTRALIBS to the makefile, for specifying additional libraries to be
5006 
linked in.
5007 
 
5008 
Adds a 'clean' target for 'make', to get rid of all temporary files, the
5009 
binaries, and the executable.
5010 
 
5011 
Changes names of system-specific files from gp-xxx.c to gp_xxx.c.
5012 
 
5013 
Adds support for VMS (gp_vms.c and ghost.dcl).
5014 
 
5015 
Creates a new file gdevs.mak, and reorganizes the other makefiles, so that
5016 
the choice of which device driver(s) to include is isolated in a single
5017 
line in the platform-specific makefile.
5018 
 
5019 
Changes the standard MS-DOS makefile so it builds for 8088/86 (not 80386),
5020 
with neither -DNOPRIVATE nor -DDEBUG.
5021 
 
5022 
Changes the name of the MS-DOS makefile from dos-ega.mak to msdos.mak, and
5023 
the Unix makefiles from ux-[g]cc-x.mak to unix-[g]cc.mak.
5024 
 
5025 
Updates drivers.doc to describe how to add new drivers in gdevs.mak.
5026 
 
5027 
Removes gdevs.ps: the drivers are now responsible for specifying the size
5028 
of the imaging region.
5029 
 
5030 
</pre><h3><a name="V2.0_Interpreter"></a>Interpreter</h3><pre>
5031 
Adds a makefile macro GS_LIB_DEFAULT and an environment variable GS_LIB to
5032 
define a search path for the library (initialization and font) files, and
5033 
implements the -I switch for the same purpose (replacing -sLIB=, which was
5034 
never actually implemented).  See interp.doc for details.
5035 
 
5036 
No longer clears the operand stack between interactive inputs.  No longer
5037 
prints the contents of the operand stack after every input in debug mode.
5038 
 
5039 
Doesn't "eat" the character that the user types to proceed after a
5040 
showpage, unless it's an isolated &lt;return&gt;.
5041 
 
5042 
Changes the prompt so that it says
5043 
	GS&gt;
5044 
if the operand stack is empty, or
5045 
	GS&lt;n&gt;
5046 
if there are n &gt; 0 elements on the operand stack.
5047 
 
5048 
Adds -w and -h switches to the command line, equivalent to -dWIDTH= and
5049 
-dHEIGHT= except that they require numeric arguments.
5050 
 
5051 
Adds -q (quiet startup) switch to the command line, which suppresses some
5052 
initial messages and also has an effect equivalent to -dQUIET.
5053 
 
5054 
Fixes bugs:
5055 
	- = and == caused an error on some kinds of objects if the object
5056 
didn't have read access.
5057 
	- cvs didn't print operator names.
5058 
	- The definition of dynamic_begin in iscan.c caused the DEC VMS C
5059 
compiler to produce incorrect code.
5060 
	- mul didn't return a correct (real) result when multiplying a
5061 
very large integer by an integer that wasn't very large.
5062 
	- eq and ne didn't work on files, fonts, save objects, and some
5063 
operators.
5064 
	- The scanner would sometimes blow up on floating point numbers
5065 
beginning with a '.'.
5066 
	- flushfile didn't pop its argument from the stack.
5067 
	- put and putinterval would store into a packed array.
5068 
	- a few operators didn't check properly for stack underflow.
5069 
	- cvrs produced wrong output for radix values greater than 10.
5070 
	- The scanner would convert upper-case letters in alternate-radix
5071 
numbers wrong on Unix systems.
5072 
	- String comparisons other than equality often produced the wrong
5073 
result if the strings were of different lengths.
5074 
	- An ifelse as the last thing inside a forall would confuse the
5075 
execution stack.
5076 
	- There were some omitted casts and 'private' declarations that
5077 
made the GNU compiler unhappy.
5078 
	- There was a memory leak in the image[mask] operators that caused
5079 
516 bytes to be permanently lost each time one of them was used.
5080 
	- Quoted strings of length greater than 50 and less than 100 would
5081 
get mangled when being read in.
5082 
	- The scanner didn't consume the whitespace character following a
5083 
token, so programs that read data out of the program file could get
5084 
confused.
5085 
	- Under rare circumstances, an object of size between 249 and 255
5086 
bytes could get allocated on top of another object.
5087 
 
5088 
Allows bind to bind packed arrays, even though they aren't normally
5089 
writable.
5090 
 
5091 
Changes the length operator to allow a name as the argument.  (The
5092 
PostScript manual doesn't allow this, but implementations apparently do.)
5093 
 
5094 
Changes the setcachedevice operator to allow the bounding box to be
5095 
specified as a 4-element array instead of 4 scalars.  (The PostScript
5096 
manual doesn't allow this, but implementations apparently do.)
5097 
 
5098 
Removes a line from ghost.ps that accidentally disabled the font cache.
5099 
 
5100 
Implements memory devices (makeimagedevice, copyscanlines, and makedevice
5101 
for image devices).  makeimagedevice is implemented only for 1, 8, 24, and
5102 
32 bits per pixel.
5103 
 
5104 
Changes the deviceparams operator so it pushes a mark on the stack below
5105 
the parameters.  This is to allow for devices that have more than the
5106 
standard set of parameters.
5107 
 
5108 
Replaces defaultdevicename with two new operators, getdevice and
5109 
devicename.
5110 
 
5111 
Adds a flushpage operator that flushes any outstanding buffered output to
5112 
the screen.  This is not the same as copypage: on printers, copypage
5113 
actually prints a page, whereas flushpage may do nothing; on displays,
5114 
flushpage and copypage may both flush output to a server.
5115 
 
5116 
Adds an unread operator for pushing back a character into a file.
5117 
 
5118 
Adds a description of proposed grayimage and colorimage operators to
5119 
ghost.doc, even though they aren't implemented yet.
5120 
 
5121 
Changes the name of the currentfileposition operator to fileposition.
5122 
 
5123 
Removes the framedevice operator, since the new device operators supersede
5124 
it.
5125 
 
5126 
Adds a writeppmfile operator, for writing the contents of a memory device
5127 
to a ppm file.
5128 
 
5129 
Makes Ghostscript work even when the &gt;&gt; operator doesn't sign-extend
5130 
negative numbers.  (This has not been tested.)
5131 
 
5132 
Adds the Symbol encoding to ghost.ps.
5133 
 
5134 
Adds two new file-related operators, filename and findlibfile.  See
5135 
ghost.doc and interp.doc for details.
5136 
 
5137 
Adds type1encrypt and type1decrypt operators for manipulating Adobe Type 1
5138 
encoded fonts.
5139 
 
5140 
Changes the imagecharpath and addcharpath operators to type1imagepath and
5141 
type1addpath.  These operators now work with the Adobe Type 1 font
5142 
encoding.
5143 
 
5144 
Adds the type1decryptfile operator for reading Adobe Type 1 encrypted
5145 
fonts.
5146 
 
5147 
</pre><h3><a name="V2.0_Library"></a>Library</h3><pre>
5148 
Fixes bugs:
5149 
	- curveto and lineto didn't check for the current point being
5150 
defined.
5151 
	- stringwidth would fail if there was no current point.
5152 
	- There were omitted casts that made the GNU compiler unhappy.
5153 
	- Line caps and joins didn't always work.
5154 
	- Dashed lines didn't work at all.
5155 
	- If you read out the current matrix while inside a BuildChar
5156 
procedure, the result was garbage.
5157 
	- image[mask] would crash if you gave it a single string with more
5158 
than 64K-1 pixels (MS-DOS only).
5159 
	- Filling with a gray pattern sometimes wrote into pixels beyond
5160 
the right edge of the region (MS-DOS only).
5161 
	- The font cache would mistake fonts for each other if both fonts
5162 
had a default (unsupplied) "unique ID".
5163 
	- When a character was entered into the font cache for the first
5164 
time, sometimes it would display as garbage and/or displaced vertically
5165 
from its proper position.
5166 
 
5167 
Implements gs_makeimagedevice, gs_copyscanlines, gs_getdevice,
5168 
gs_devicename, gs_flushpage, gs_writeppmfile, gs_type1encrypt,
5169 
gs_type1decrypt, gs_type1imagepath, and gs_type1addpath procedures
5170 
corresponding to the new operators in the interpreter (see preceding
5171 
section).
5172 
 
5173 
Changes [gs_]setdevice so that it does an erasepage when it first opens
5174 
the device.
5175 
 
5176 
Changes definition of gx_device structure as follows.  NOTE: THIS AFFECTS
5177 
ALL DRIVERS.
5178 
 
5179 
	- Removes bits_from_MSB (which wasn't actually used, in any case).
5180 
	    Ghostscript now assumes officially, as it always did in
5181 
	    practice, that device bitmaps are stored MSB first, i.e., X=0
5182 
	    corresponds to the 0x80 bit in the first byte.
5183 
 
5184 
	- Removes the initial_matrix member, which wasn't actually being
5185 
	    set up.
5186 
 
5187 
	- Adds a new member 'name', a string giving the device name.
5188 
 
5189 
	- Adds new members 'x_pixels_per_inch' and 'y_pixels_per_inch'.
5190 
	    These are only used by the default initial_matrix procedure
5191 
	    (see below).
5192 
 
5193 
	- Adds a new procedure 'output_page'.  The default implementation
5194 
	    (gx_default_output_page) just calls the sync_output procedure.
5195 
 
5196 
	- Adds a new procedure 'get_initial_matrix'.  The default
5197 
	    procedure uses the width, height, and x/y_pixels_per_inch
5198 
	    members to compute the matrix, assuming that X values run from
5199 
	    right to left, and Y values run from top to bottom.
5200 
 
5201 
Changes the names of the allocation procedure types gs_proc_alloc and
5202 
gs_proc_free to proc_alloc_t and proc_free_t, and moves them from gs.h to
5203 
std.h.
5204 
 
5205 
Makes Ghostscript work even when the &gt;&gt; operator doesn't sign-extend
5206 
negative numbers.  (This has not been tested.)
5207 
 
5208 
</pre>
5209 
 
5210 
<!-- [3.0 begin visible trailer] =========================================== -->
5211 
<hr>
5212 
 
5213 
<p>
5214 
<small>Copyright &copy; 1996, 1997, 1998 Aladdin Enterprises.
5215 
All rights reserved.</small>
5216 
 
5217 
<p>
5218 
This software is provided AS-IS with no warranty, either express or
5219 
implied.
5220 
 
5221 
This software is distributed under license and may not be copied,
5222 
modified or distributed except as expressly authorized under the terms
5223 
of the license contained in the file LICENSE in this distribution.
5224 
 
5225 
For more information about licensing, please refer to
5226 
http://www.ghostscript.com/licensing/. For information on
5227 
commercial licensing, go to http://www.artifex.com/licensing/ or
5228 
contact Artifex Software, Inc., 101 Lucas Valley Road #110,
5229 
San Rafael, CA  94903, U.S.A., +1(415)492-9861.
5230 
 
5231 
<p>
5232 
<small>Ghostscript version 8.53, 20 October 2005
5233 
 
5234 
<!-- [3.0 end visible trailer] ============================================= -->
5235 
 
5236 
</body>
5237 
</html>