   Copyright (C) 1996 Aladdin Enterprises.  All rights reserved.
  
  This file is part of Aladdin Ghostscript.
  
  Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND.  No author
  or distributor accepts any responsibility for the consequences of using it,
  or for whether it serves any particular purpose or works at all, unless he
  or she says so in writing.  Refer to the Aladdin Ghostscript Free Public
  License (the "License") for full details.
  
  Every copy of Aladdin Ghostscript must include a copy of the License,
  normally in a plain ASCII text file named PUBLIC.  The License grants you
  the right to copy, modify and redistribute Aladdin Ghostscript, but only
  under certain conditions described in the License.  Among other things, the
  License requires that the copyright notice and this notice be preserved on
  all copies.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

This file, history3.txt, describes the changes in older releases of
Ghostscript numbered 3.0 through 3.33.  For more recent changes, see
the NEWS file.

For an overview of Ghostscript and a list of the documentation files, see
README.

Version 3.33 (4/13/95)
============

A few more last-minute bug fixes.  This is, finally, the first public
release since 3.12.

Documentation
-------------

Fixes bugs:
	- There was a reference to "VAX with OSF/1", which doesn't exist,
and an incorrect reference to VAX with Ultrix.  (make.doc)
	- The Unix makefiles incorrectly stated that gsdatadir was only
relevant to `make install'.  (ansihead.mak, cc-head.mak, dgc-head.mak,
gcc-head.mak)
	- Notes that DV/X users should use the zip version of the JPEG
library.  (jpeg.mak)

Procedures
----------

Fixes bugs:
	- A command line had gotten too long for the MS-DOS shell.
(gs.mak)
	- The VMS DEC C script didn't explicitly select DEC C.
(vms-decc.mak)
	- The VMS MODULES.LIS omitted SPDIFF and ZFPDIFF.  (modules.lis)
	- The VMS script had an incorrect entry.  (vms.mak)
	- The `if' fix in 3.31 broke some Unix systems with different
implementations of sh.  (unix-end.mak)
	- The makefile definition of gscspace_h was out of order.  (gs.mak)
	- An extra ; got written in gconfig_.h on DV/X platforms.
(dvx-tail.mak)
	- '.' was incorrectly prepended to the library search list on DV/X
platforms.  (dgc-head.mak)
	- The build rules for unix*.mak didn't work on DV/X.  (unix-end.mak)

Adds a description of the -c quit switch to the help message.  (gs.c)

For the DV/X platform, changes /usr/include to /djgpp/include as the place
to look for header files.  I'm not sure this is always correct.
(dvx-tail.mak)

Utilities
---------

Fixes bugs:
	- ps2ascii would cause an error if given a font that didn't have an
'X' character.  (ps2ascii.ps)
	- ps2ascii didn't intercept the Level 2 string display operators.
(ps2ascii.ps)

Drivers
-------

Fixes bugs:
	- The Stylus Color driver had an incorrect type name.  (gdevstc.c)

Platforms
---------

Fixes bugs:
	- -dBitsPerPixel= didn't work properly for MS Windows or OS/2 PM.
(gdevmswn.c, gdevpm.c)
	- The Win32 platform didn't compile properly.  (memory_.h)

Fonts
-----

Improves the font substitution algorithm to take the face name into account
in more cases.  (gs_fonts.ps)

Library
-------

Fixes bugs:
	- Unrotated black-and-white bitmaps with an inverted device X axis
were displaced in X.  (gsimage1.c)

Version 3.32 (4/7/95)
============

More bug fixes.  This is still not a public release.

Documentation
-------------

Further clarifies the "two-phase commit" algorithm for device put_params
procedures.  (drivers.doc, gsparam.h)

Adds a note about a compiler bug under Ultrix 4.4.  (make.doc)

Procedures
----------

Fixes bugs:
	- Some installation scripts could fail because some implementations
of sh take the status of an `if' condition as the status of the `if'
command.  (unix-end.mak)

Adds "maintainer-clean" as a synonym for "real-clean".  (gs.mak)

Adds a -dORIENT1 switch that defines orientation = 1 as portrait for
setpage[params].  (use.doc, gs_init.ps, gs_lev2.ps, gs_statd.ps)

Utilities
---------

Fixes bugs:
	- ps2ascii didn't redirect %stdout completely.  (ps2ascii.ps)
	- ps2ascii didn't preserve the local/global VM mode.  (ps2ascii.ps)
	- ps2ascii didn't handle fonts with an all-zero or missing bounding
box correctly.  (ps2ascii.ps)
	- viewpbm didn't scale the image properly.  (viewpbm.ps)

Drivers
-------

Fixes bugs:
	- The CGM driver wrote out an incorrect color precision value.
(gdevcgm.c)
	- The SGI bitmap driver was named "sgi" rather than "sgirgb".
(gdevsgi.c)
	- The PCX driver didn't round up an odd line length for gray-scale
output.  (gdevpcx.c)
	- The PCX driver produced incorrect output for gray-scale or 4- or
8-bit color.  (gdevpcx.c)

Platforms
---------

Fixes bugs:
	- The VMS MODULES.LIS file had gotten out of sync with the Unix
makefiles (again).  (modules.lis)

Interpreter
-----------

Fixes bugs:
	- Some compilers won't accept '\l', even in the false arm of a
preprocessor conditional.  (scanchar.h)
	- A procedure was declared with an incorrect argument type.
(zcsindex.c)
	- The scaled font cache didn't copy XUIDs properly.  (bfont.h,
zfont.c, zfont2.c)
	- status could return true even if the file was closed.  (zfile.c)

Streams
-------

Fixes bugs:
	- The LZW filters were factored improperly.  (modules.lis, gs.mak,
vms.mak, slzwx.h, slzwc.c, slzwd.c)

Changes the DCTDecode filter for compatibility with Adobe implementations:
	- Ignore bytes preceding the 0xff that marks the beginning of the
JPEG data.  (sdctd.c)
	- Set MAX_BLOCKS_IN_MCU to 64.  (jpeg.mak, gsjpglib.h)

Library
-------

Fixes bugs:
	- The "two-phase commit" for device parameters wasn't fully
implemented.  (gsiodev.c)
	- Asking for a device color map before the device was opened could
cause a crash.  (gsdparam.c)
	- The scaled font cache didn't copy XUIDs properly.  (gxfont.h,
gsfont.c)
	- 90 or 270 degree rotated black-and-white bitmaps (including
bitmapped fonts such as downloaded TrueType fonts) with an inverted device Y
axis were displaced in Y.  (gsimage1.c)
	- On high-resolution devices, parts of regions filled with halftones
could fail to be painted.  (gxclist.c)

Version 3.31 (4/2/95)
============

A few final bug fixes for the release.  Includes significant speed
improvements for CIE color, and a first draft of a low-level CGM driver.

Documentation
-------------

Notes that the BJC600 driver also works for the BJC4000.  (devs.mak)

Procedures
----------

At the suggestion of a user, changes the default protections for installed
files on Unix and DV/X systems from 775/664 to 755/644.  (*head.mak)

At the suggestion of a user, adds a -dNOCIE switch to substitute DeviceGray
and DeviceRGB color spaces for CIEBasedA and CIEBasedABC spaces
respectively.  (gs_init.ps, gs_lev2.ps)

Utilities
---------

Changes gslp and its relatives to use ISOLatin1Encoding for output, and to
send almost all printout to stderr rather than stdout (for use as a filter
under Unix).  (gslp.ps)

Drivers
-------

Fixes bugs:
	- The fax/TIFF driver no longer exported gdev_fax_print_page, which
the DigiFax driver needs.  (gdevtfax.c)
	- The color DeskJet drivers gave an error for BitsPerPixel=3.
(gdevcdj.c)
	- The "Windows printer" driver was setting its margins in points
rather than inches.  (gdevwprn.c)
	- The BJ10 and BJ200 drivers calculated vertical skip distances
wrong.  (gdevbj10.c)
	- The BJ10 and BJ200 drivers output two garbage bytes following the
initialization string.  (gdevbj10.c)

Adds a preliminary driver that produces low-level CGM output.  (gdevcgml.h,
gdevcgmx.h, gdevcgm.c, gdevcgml.c)

Platforms
---------

Fixes bugs:
	- The VMS files had gotten out of sync with the other makefiles
(again).  (modules.lis, vms.mak)
	- The MS Windows and OS/2-PM drivers hadn't been updated to handle
BitsPerPixel as a standard parameter.  (gdevmswn.c, gdevpm.c)

Removes the TIFF drivers from the Windows platform, and restores the BMP
drivers.  (bcwin.mak)

Interpreter
-----------

Fixes bugs:
	- The CIE color mapping cache could produce anomalous results
for the default (all zero values) color if some of the mapping
functions were non-linear.  (zcie.c)
	- MultiMaster font substitution got confused if substituted
fonts had their FontName changed.  (gs_fonts.ps)
	- A procedure was declared as private inconsistently.  (zdevcal.c)
	- Some pointer relocation procedures didn't work correctly on
systems with sizeof(T *) > sizeof(int).  (istack.c)
	- The freelist vector wasn't large enough to handle graphics state
objects on 64-bit systems, leading to severe memory sandbars.  (iastate.h)
	- The debugging messages from the allocator had gotten inconsistent
and hard to use.  (ialloc.c)
	- Mixing save/restore with allocation could cause the GC never to
get run.  (isave.c)

Speeds up the mapping of CIE colors.  (zcie.c)

Adds a .namestring operator for getting the string of a name without having
to copy it.  (zstring.c)

Streams
-------

Fixes bugs:
	- The IJG code needed a couple more flags set for IJG v6.
(gsjmorec.h)
	- Some pointer relocation procedures didn't work correctly on
systems with sizeof(T *) > sizeof(int).  (stream.c)

Library
-------

Fixes bugs:
	- The end-test for the fast case of monobit images was wrong,
leading to out-of-range memory accesses.  (gsimage1.c)
	- Monobit images rotated by 270 degrees displayed incorrectly.
(gsimage1.c)
	- If a Type 1 font used hint replacement, some parts of the outline
before the hint replacement ignored the old hints.  (gstype1.c)
	- Some compilers didn't accept a variable name that was the same as
a macro with parameters.  (gxht.c)
	- A procedure was declared as private inconsistently.  (gdevm1.c)
	- Some pointer relocation procedures didn't work correctly on
systems with sizeof(T *) > sizeof(int).  (gdevmem.c, gsstate.c)
	- The test on FORCE_HINTS_TO_BIG_PIXELS was backwards.  This bug was
supposed to have been fixed in 3.30, but somehow the fix got lost.
(gstype1.c)
	- 90 degree rotated monobit images could drop some scan lines.
(gsimage*.c)

Speeds up the mapping of CIE colors.  (gscie.h, gxcmap.h, gscie.c, gxcmap.c)

Speeds up color images (non-interpolated, 1-8 bits per component) by adding
a cache for mapped color values.  (gximage.h, gsimage.c, gsimage1.c,
gsimage2.c)

Shrinks the band list file slightly by using only as many bytes as necessary
for writing out colors, rather than always using 4 bytes.  (gxclist.c,
gxclread.c)

Version 3.30(beta) (3/21/95)
==================

More bug fixes.  The garbage collector and PDF interpreter finally appear to
work reliably.

Documentation
-------------

Fixes bugs:
	- language.doc had gotten out of date.  (language.doc)

Utilities
---------

Fixes bugs:
	- Changes in the handling of %stdout had broken ps2ascii.
(gs_dps1.ps, ps2ascii.ps)

Improves ps2ascii to skip empty strings and not output redundant font
changes.  (ps2ascii.ps)

Drivers
-------

Fixes bugs:
	- The fax and TIFF drivers didn't free all their working storage.
(This bug was fixed in 3.27, and the fix somehow got lost.)  (gdevtfax.c)

Adds new drivers:
	- sgirgb, to produce SGI RGB raster files.  (gdevsgi.c)
	- tiffcrle, to produce output in TIFF "CCITT 1-dimensional Huffman
RLE" format (Group 3 fax with no EOLs). (gdevtfax.c)
	- tifflzw, to produce output in TIFF LZW format (using the existing
CCITTFaxEncode filter code). (gdevtfax.c)
	- tiffpack, to produce output in TIFF PackBits format. (gdevtfax.c)

Interpreter (PostScript)
------------------------

Fixes bugs:
	- If the current screen was set with a halftone, setcolorscreen
wouldn't accept what currentcolorscreen returned.  (gs_dps1.ps)
	- debug_print_full_ref didn't print t_oparray objects correctly.
(idebug.c)
	- The internal data for a font could be allocated in a different VM
space from the font dictionary, causing dangling pointers.  (zfont2.c)
	- definefont became confused if a program failed to delete the FID
from a re-encoded font.  (This is questionable PostScript, but dvips does
it.)  (zfont2.c)
	- If a BuildChar procedure did a save before the setcachedevice and
a restore afterwards, the memory manager would attempt to free the cache
device after it had already been freed by the restore, leading to damaged
freelists.  (gschar.c)
	- setresolution (in statusdict) was ignored.  (gs_lev2.ps,
gs_statd.ps)
	- If a string containing a string containing a \ was passed to the
token operator, the \ was not recognized properly in a Level 2 environment.
(iscan.c)
	- A couple of default dictionary sizes had become too small.
(iinit.c)

Makes DOS EOF (control-Z, 0x1a) a self-delimiting token, like left bracket.
THIS IS A NON-BACKWARD-COMPATIBLE CHANGE, but it should not have any adverse
effects.  (gs_init.ps, iscan.c, iscantab.c)

Distinguishes arch_small_memory from arch_ints_are_short, and adds a new
-Z. switch to force small-memory table sizes regardless of actual memory
size.  (dstack.h, idict.c, zpcolor.c, zvmem2.c)

Interpreter (PDF)
-----------------

Fixes bugs:
	- A page with no Contents caused an error.  (pdf_main.ps)
	- Executing a Form resource caused an error.  (pdf_draw.ps)
	- Outlines with open entries caused an error.  (pdf_main.ps)
	- Embedded Type 3 fonts caused an error.  (pdf_draw.ps, pdf_font.ps)
	- The Widths array of fonts was ignored.  (pdf_font.ps)

Library
-------

Fixes bugs:
	- Freeing an entry in the pattern cache didn't clear the pointers to
the raster data, producing a dangling reference that confused the garbage
collector.  (gxpcmap.c)
	- The test on FORCE_HINTS_TO_BIG_PIXELS was backwards.  (gstype1.c)
	- The pattern cache bookkeeping was incorrect.  (gxpcmap.c)
	- Depending on the order in which pointers were relocated, the
garbage collector could incorrectly relocate pointers from the character
cache.  (gxfcache.h, gsfont.c, gxccache.c, gxccman.c)

Changes the fast case of black-and-white images so it aligns scaled images
with the device coordinate system, to improve performance.  (gsimage1.c)

Extends the coordinate transformation routines to handle absurdly large
translation values in the CTM as long as the final device device coordinates
are within fixed-point range.  (gxmatrix.h, gxpath.h, gschar.c, gscoord.c,
gsmatrix.c, gxhint2.c, gxpath2.c)

Distinguishes arch_small_memory from arch_ints_are_short, and adds a new
-Z. switch to force small-memory table sizes regardless of actual memory
size.  (gdevprn.h, gxpcolor.h, gzht.h, std.h, gsfont.c, gsht1.c, gspaint.c,
gsstate.c, gxcht.c, gxht.c, gxpcmap.c)

Version 3.29(internal) (3/8/95)
======================

Another bug-fix release.  This release processes all but 7 of the 500+ files
on the Adobe Acrobat Sampler CD-ROM without giving an error.  The garbage
collector finally appears to be stable.  This version was created for a
customer; it was not released to the general public or even to the beta test
list.

Documentation
-------------

Documents the possible need to set LD_RUN_PATH on SVR4 platforms.
(make.doc)

Expands the description of the device life cycle, and of the constraints on
put_params procedures.  (drivers.doc)

Adds an explicit copyright notice to the Aladdin Ghostscript Free Public
License.  (PUBLIC)

Clarifies that the Win32s documentation also applies to Windows NT.
(make.doc)

Procedures
----------

Removes the obsolete writeppmfile operator from the standard configurations.
(gs.mak)

Changes the Watcom makefiles to work properly with Watcom C/C++ 10.0.
(make.doc, msc.mak, watc.mak, watcwin.mak, wccommon.mak)

Utilities
---------

Adds a wftopfa utility for converting the Wadalab fonts to usable Type 0 and
Type 1 form.  (wftopfa)

Fonts
-----

Fixes bugs:
	- Entries added automatically by definefont (FontInfo, ExactSize)
could cause a font dictionary to become full.  (gs_fonts.ps, gs_type1.ps)
	- wrfont.ps couldn't deal with very long CharStrings.  (wrfont.ps)

Makes the name of the Fontmap file an easily editable parameter.
(gs_fonts.ps)

Adds a utility for converting the Wadalab font to usable Type 0 and Type 1
form.  (wrfont.ps, wftopfa.ps)

Drivers
-------

Fixes bugs:
	- The top margin for printer (and fax) devices was computed
incorrectly, using the X resolution rather than the Y resolution.
(gdevprn.h)
	- Changing the page size or resolution of a printer device closed
and reopened the device unnecessarily.  (gdevprn.c)
	- Changing the page size of the X11 device didn't change the initial
matrix, so (0,0) didn't wind up in the lower left corner.  (gdevx.c)
	- The bit devices didn't allow changing the number of bits per
pixel.  (gdevbit.c)

Adds a settable .IsPageDevice boolean device parameter to the X Windows
driver.  The default value is true.  (gdevx.h, gdevx.c)

Changes the PPM driver so that it chooses between PBM/PGM/PPM on a
page-by-page basis, rather retaining the most general format ever required
by any page.  (gdevpbm.c)

Interpreter (PostScript)
------------------------

Fixes bugs:
	- The current page device could be null, rather than an empty
dictionary.  (igstate.h, zchar.c, zdevice.c, zdevice2.c, zgstate.c)
	- The scanner didn't signal an error for names or strings that were
too long.  (iscan.c)
	- A missing header file upset the VAX compilers.  (ztype.c)
	- Some places expecting dictionary operands didn't check the type,
because they incorrectly assumed that the dict_check_read/write macro did
this.  (idict.h, zdevice2.c, zht2.c, zmisc2.c)
	- The definition of quit in systemdict wasn't disabled within
encapsulated jobs.  (gs_lev2.ps)
	- resetfile gave an error if the file was closed, rather than doing
nothing.  (zfileio.c)
	- The scanner attempted to free an uninitialized pointer if it
reached EOF after a / or //.  (iscan.c)
	- A restore in a different file than the corresponding save caused
an invalidrestore error.  (gs_init.ps)
	- The default value of EndOfData in RunLengthDecode streams was set
to false.  (zfilter.c)
	- .registerencoding didn't invoke the save machinery correctly,
leading to GC problems.  (zfont2.c)
	- The facility for overriding .printerror didn't work correctly.
(gs_init.ps)
	- gs_run_file_open wasn't public.  (gsmain.c)
	- The interpreter returned e_undefined for undefined error names,
rather than the error code.  (interp.c)
	- Allocation in system memory (specifically, adding a block to a
stack) couldn't trigger automatic garbage collection.  (interp.c, igc.c,
zvmem2.c)
	- A restore in a different invocation of gs_run_string than the
corresponding save would stop reading the string.  (files.h, gsmain.c,
iccinit.c, zfile.c)
	- The Type 1 rasterizer state included a pointer into the middle of
an object, confusing the garbage collector.  (zchar1.c, zfont1.c)
	- When the garbage collector deleted a name, it didn't zero out the
string pointer.  (iname.c)
	- On platforms where obj_align_mod > 4, the memory manager could
access 1 beyond the end of its freelists.  (iastate.h)
	- makefont and scalefont didn't check the type of their font operand
soon enough.  (zfont.c)
	- restore didn't finalize the objects it freed.  (isave.c)
	- restore didn't free system VM.  (isave.c)
	- Freeing a ref array that occupied an entire chunk didn't free the
chunk.  (ialloc.c)

Adds a .runexec operator which implements the 'close if error' function of
run.  (zfile.c, zfileio.c)

Moves the obsolete writeppmfile operator into a separate file.  (zfileio.c,
zwppm.c)

Makes the statistics returned by the memory manager more accurate.
(ialloc.c, zvmem.c)

Adds a (read-only) %Calendar% IODevice.  (zdevcal.c)

Adds a "hook" in the character operators to allow external code to
intervene; this is needed for a customer.  (ichar.h, zchar.c, zchar2.c)

Makes control-D (0x04) a self-delimiting token, like left bracket.  THIS IS
A NON-BACKWARD-COMPATIBLE CHANGE, but it should not have any adverse
effects.  (scanchar.h, iscan.c, iscantab.c)

Changes the error stack printout so that it puts line breaks between items
iff the items are being printed with ==.  (gs_init.ps)

Uses finalization to close streams being freed.  (igc.c, zfile.c, ziodev.c)

Interpreter (PDF)
-----------------

Fixes bugs:
	- Embedded Type 1 fonts that invoked save and restore while being
read caused an error.  (pdf_font.ps)
	- Large files that referenced a non-alphabetic font for the first
time late in the file could cause an error.  (pdf_main.ps)

Streams
-------

Fixes bugs:
	- SubFileDecode streams didn't copy partial matches of the EOD
string into their output.  (sfilter1.c)

Makes switching between read and write modes a stream procedure.  (stream.h,
sfile.c, sfileno.c, stream.c, zfileio.c)

Makes file streams close themselves when finalized.  (We can't do this for
other streams, because finalization procedures aren't allowed to free
storage explicitly.)  (stream.h, sfile.c, sfileno.c, stream.c)

Library
-------

Fixes bugs:
	- The obsolete files gcdefs.h and gsfile.c were still included in
the fileset.
	- A number of places didn't deal with null patterns properly (p_tile
== 0).  (gxdcolor.h, gspcolor.c, gxpcmap.c)
	- The pattern tiling algorithm was numerically unstable, especially
if the X/YStep vectors were close to the axes.  (gxcolor2.h, gspcolor.c,
gxpcmap.c)
	- setdeviceparams checked the values of read-only byte array
parameters incorrectly.  (gsdparam.c)
	- The statistics macros in gxfill.c didn't use DO_NOTHING when
disabled.  (gxfill.c)
	- Changing the orientation of a device closed and reopened the
device unnecessarily.  (gsdparam.c)
	- ioerrors occurring when writing command lists weren't reported
properly.  (gxclist.h, gxclist.c)
	- Errors from device procedures weren't always propagated up to
clients.  (gsimage1.c, gsimage3.c, gxclip2.c, gxclist.c)
	- Overflowing the fixed-point translation values in the CTM caused a
floating point exception rather than a limitcheck.  (gxmatrix.h, gscoord.c)
	- charpath set the current point correctly, but didn't append a
moveto element to the path.  (This mostly affected Mathematica output.)
(gzpath.h)
	- Image devices mapped colors incorrectly.  (gdevmem.c, gdevm16.c)
	- On devices with color capability but fewer than 4 bits per pixel,
color halftones didn't work (and could cause an arithmetic exception).
(gxdither.c)
	- Black-on-white memory devices didn't map colors properly.
(gdevprn.h, gxdevice.h, gxdevmem.h, gdevmem.c, gdevm1.c, gsdevice.c)
	- Memory devices with a non-zero origin in their initial matrix
clipped the image improperly.  (gsdevice.c)
	- The Type 1 rasterizer state included a pointer into the middle of
an object, confusing the garbage collector.  (gstype1.h, gxfont1.h,
gxtype1.h, gstype1.c, gxhint2.c)
	- The band rasterizer could produce garbled output for images
(including characters) on 64-bit architectures.  (gxclread.c)
	- Bounding boxes (for pathbbox and setbbox) could be slightly
inaccurate.  (gsmatrix.c)
	- On 64-bit architectures, halftone tiles less than 16 bits wide
were handled incorrectly.  (gxclist.c)

Adds an .IsPageDevice boolean device parameter (normally read-only).
(gsdparam.c)

Removes the library code for implementing the obsolete writeppmfile
operator.  (gswppm.c)

Makes the default matrix (for initmatrix and defaultmatrix) a settable
parameter in the graphics state.  (gscoord.h, gzstate.h, gscoord.c,
gsdevice.c, gsdparam.c)

Makes the statistics returned by the memory manager more accurate.
(gsmemory.h)

Adds a compile-time flag to choose whether or not to force Type 1 hints to
"big pixel" boundaries when oversampling.  (gstype1.c)

Changes the .PageCount device parameter back to PageCount, because the
change broke some scripts.  (gsdparam.c)

Adds optimization for 90 degree rotated images with pure colors.
(gximage.h, gsimage.c, gsimage1.c)

Changes the band rasterizer so that replicated halftone tiles are written on
the band list in unreplicated form.  (gsbitops.h, gxcldev.h, gsbitops.c,
gxclist.c, gxclread.c, gxht.c)

Changes the .HWBitsPerPixel device parameter to BitsPerPixel.  (drivers.doc,
language.doc, gdevcdj.c, gdevstc.c, gsdparam.c)

Version 3.28(beta) (2/13/95)
==================

Another bug-fix beta release.  The number of bugs being fixed in each of
these sub-releases does exceed the number of new bugs introduced, but the
latter number is discouragingly high.

Documentation
-------------

Adds some information about handling VMS file attributes for files
transferred by FTP.  (use.doc)

Procedures
----------

Fixes bugs:
	- unix-gcc.mak said the static linkage switch for SunOS was -Bstatic
rather than -static.  (unix-gcc.mak)
	- Some dependency lists in gs.mak were out of date.  (gs.mak)

Utilities
---------

Fixes bugs:
	- markhint.ps didn't check for protected fonts.  (markhint.ps)

Drivers
-------

Fixes bugs:
	- The cdj driver had a byte/char agreement problem.  (gdevcdj.c)
	- The cdj driver attempted to initialize a dynamic array.
(gdevcdj.c)

Removes the setting of InputAttributes and OutputAttributes from the H-P
drivers, since this causes more problems than it solves.  (gdevdjet.c)

Interpreter
-----------

Fixes bugs:
	- makeoperator assigned incorrect attributes to operators. (bug
introduced in 3.27) (opdef.h, iinit.c, iutil.c, zmisc.c)

Library
-------

Fixes bugs:
	- gs_makeimagedevice didn't set the caller's pointer to the newly
created device.  (bug introduced in 3.27) (gsdevice.c)
	- There were still some mismatches between char * and byte * values.
(gsdparam.c)
	- The halftone replication algorithm could produce inappropriately
large replicated masks.  (gxht.c)
	- stroke usually did the wrong thing for degenerate (single-point)
subpaths.  (gxstroke.c)

Version 3.27(beta)(withdrawn) (2/8/95)
=============================

Yet another bug-fix beta release.  This release had so many serious problems
(the most serious being at least one changed file that the release tool
failed to include in the fileset) that it was withdrawn less than a day
after it was issued.

Documentation
-------------

Fixes bugs:
	- The NEWS for 3.26 didn't mention the fact that the stdxxx stream
interface used by MS Windows, OS/2, and Macintosh implementations had
changed.  (NEWS)
	- The file public.doc wasn't distributed with the previous fileset.

Brings the NeXTSTEP documentation up to date for NeXTSTEP releases 3.2 and
subsequent.  (make.doc)

Procedures
----------

Fixes bugs:
	- Some dependency lists in gs.mak were out of date.  (gs.mak)
	- A 'fi;' was missing in the Unix install script.  (unix-end.mak)
	- There was no VMS build script for the PDF options.  (vms.mak)
	- The VMS script used CC_QUALI instead of CC_QUAL in several places.
(vms.mak)

Utilities
---------

Fixes bugs:
	- ps2epsi's usage prompt referred to "pstoepsi".  (ps2epsi)
	- ps2epsi set PATH and LOCALPATH unilaterally.  (ps2epsi)

Comments out the sample usage line at the end of viewjpeg.ps.  (viewjpeg.ps)

Drivers
-------

Fixes bugs:
	- The fax and tiff drivers didn't free all of their working storage.
(gdevtfax.c)

Adds user-contributed drivers for the BJC 600 and ESC/P printers.
(devs.mak, gdevcdj.c)

Platforms
---------

Fixes bugs:
	- Some necessary casts of string parameters to (const byte *) were
omitted.  (gp_mswin.c, gp_os2.c)

Adds the psmono and bit* drivers, and removes the p*m drivers, in the OS/2,
32-bit MS-DOS, and 32-bit Windows configurations.  (bcwin32.mak, os2.mak,
watc.mak)

Fonts
-----

Fixes bugs:
	- The Fontmap for Ultrix had somehow become slightly incorrect.
(Fontmap.Ult)

Removes the font file names from the dependency lists in cfonts.mak.  This
makes cfonts.mak readily usable with any set of fonts, but it also means
that it will always run font2c, rather than being able to avoid this if the
.c file is up to date.  (cfonts.mak)

Interpreter
-----------

Fixes bugs:
	- Some operators could fail if the stdxxx streams weren't currently
open.  (files.h, zfileio.c, ziodev.c)
	- setpagedevice didn't handle unrecognized keys properly.
(gs_setpd.ps)
	- The value returned for the HWColorMap device parameter was
allocated incorrectly, confusing the garbage collector.  (iparam.c)
	- Typing ahead at the >>showpage<< prompt no longer caused all
further pages to be processed without stopping.  (gs_init.ps)
	- Setting DEVICEWIDTHPOINTS or DEVICEHEIGHTPOINTS on the command
line caused a typecheck.  (gs_init.ps)
	- The garbage collector didn't handle halftone threshold arrays
properly.  (zht2.c)
	- setdefaulttimeouts caused an error on Level 2 systems.
(gs_lev2.ps)
	- cvi and cvr weren't equivalent to token followed by a type check.
(iscan.h, iscannum.h, iscan.c, iscannum.c, ztoken.c, ztype.c)
	- In Level 2 systems, image and colorimage didn't allow 12 bits per
sample.  (zpaint.c)
	- If debugging was enabled, the garbage collector printed spurious
error messages about the allocator objects not being in a chunk.  (ialloc.c)
	- restore didn't reset the count of operator procedures, so the
operator procedure table could fill up.  Fixing this required splitting the
op_array_table into a global table and a local table.  (opdef.h, iinit.c,
iutil.c, zmisc.c)
	- .forgetsave could leave a dangling pointer in the memory manager,
causing an access error.  (ialloc.c, isave.c)
	- Freed objects weren't always marked as freed, which could confuse
the memory validator.  (ialloc.c)
	- .forgetsave didn't mark inner chunk headers as free, leading to
access errors.  (isave.c)

Changes the representation of operator procedures so that they point
directly to their definition in the op_array_table.  (iref.h, opdef.h,
idebug.c, igc.c, igcref.c, interp.c, zmisc.c)

Removes .makeglobaloperator.  (zmisc.c)

Adds patches to discard some common garbage produced by H-P-oriented
applications and drivers.  (gs_init.ps)

Changes the >>showpage<< prompt so that if the input reaches EOF, the
interpreter still stops after the next >>showpage<<, rather than processing
all subsequent pages.  This is a consequence of the bug fix that
automatically reopens the stdxxx files.

Adds an optional dictionary parameter for the RunLengthEncode/Decode
filters, to allow specifying EndOfData.  The default is true.  (zfilter.c)

Adds ByteTranslateEncode/Decode filters.  (zfilter2.c)

Streams
-------

Fixes bugs:
	- The K > 0 option of the CCITTFaxDecode filter switched back to 2-D
encoding if an output buffer boundary fell in the middle of a 1-D line, and
signalled an error if an input buffer boundary fell in the middle of an EOL.
(scfd.c)

Adds an EndOfData flag to the RunLengthEncode/Decode filters.  If true, RLE
generates 128 as EOD, and RLD recognizes it; if false, RLE does not mark
EOD, and RLD ignores 128.  (srlx.h, gxclist.c, gxclread.c, sfilter1.c)

Adds ByteTranslateEncode/Decode streams.  (sbtx.h, sfilter2.c)

Library
-------

Fixes bugs:
	- There were some mismatches between char * and byte * values.
(gsdparam.c)
	- Failure to round a scaling coordinate caused one-for-one
black-and-white images to render slower than they should.  (gsimage.c)
	- Setting PageSize without setting HWResolution could cause an
invalid memory access.  (gsdparam.c)
	- The garbage collector didn't handle halftone threshold arrays
properly.  (gxht.h, gsht.c, gsht1.c)

Version 3.26(beta) (2/1/95)
==================

Yet another bug-fix beta release, still not ready for public release.

Documentation
-------------

Fixes bugs:
	- The description of device properties had gotten out of sync with
the code.  (language.doc)

Splits off documentation specific to the Aladdin (non-GNU) release into a
separate file.  (readme, public.doc, unix-end.mak)

Adds a pointer to a collection of other free fonts (including some Cyrillic
ones) available on the net.  (public.doc)

Procedures
----------

Fixes bugs:
	- On VMS systems with both VAX C and DEC C installed, the build script
used VAX C rather than DEC C.  (vms.mak)
	- zfdecode.c didn't have a build rule.  (gs.mak)
	- Several macros in the makefile were used before they were defined.
(gs.mak)
	- Several macros in the makefile were used without being defined.
(gs.mak)

Replaces the gssetdev, gssetmod, and gsaddmod scripts with more variants of
echogs.  (echogs.c, gs.mak)

Utilities
---------

Fixes bugs:
	- The ps2ascii shell script passed a -f flag to the shell, which not
all shells recognize.  (ps2ascii)

Drivers
-------

Fixes bugs:
	- Due to a typo in an initialization string, the H-P printers didn't
reset the top margin to zero.  (gdevdjet.c)

Adds InputAttributes and OutputAttributes entries to the H-P drivers.  (This
should probably be generic to all printers.)  (gdevdjet.c)

Replaces the contributed Epson Stylus Color driver with a newer version.
(devices.doc, gdevstc.c)

Platforms
---------

Fixes bugs:
	- DEC C complained about 'abs' and 'exit' not being declared.  (x_.h)
	- gp_mswin.c and gp_os2.c wouldn't compile.  (gp_mswin.c, gp_os2.c,
ziodev.c)

Interpreter
-----------

Fixes bugs:
	- The default CIE rendering dictionary gave everything a magenta tint.
(gs_lev2.ps)
	- Changing HWResolution and PageSize in the same call of
setpagedevice produced an incorrect HWSize.  (gsdparam.c)
	- .putdeviceparams didn't accept all the keys that .getdeviceparams
returned.  (gsdparam.c)
	- The default handler for interrupt and timeout errors didn't push a
current object (command) on the stack.  (gs_init.ps)
	- The garbage collector didn't handle strings larger than 64K
properly.  (iastate.h, ialloc.c, igcstr.c)

Adds media matching and Policy consultation to the implementation of
setpagedevice.  (gs_setpd.ps)

Adds a MaxGlobalVM system parameter.  (zmisc2.c)

Streams
-------

Fixes bugs:
	- The CCITTFaxEncode filter could access a byte beyond the end of
the allocated area.  (scfe.c)
	- The CCITTFaxDecode filter could get an ioerror if a buffer
boundary fell in exactly the wrong place.  (scfd.c)

Library
-------

Fixes bugs:
	- The garbage collector didn't trace colored halftones properly.
(gzht.h)
	- The garbage collector didn't relocate the bitmap pointers in
halftone caches properly.  (gzht.h, gxht.c)

Adds the ability to transmit dictionaries through the param_list mechanism
(specifically, as device parameters).  This change is
non-backward-compatible only for implementors of parameter lists, which only
exist within the Ghostscript core.  (gsparam.h, iparam.h, iparam.c)

Removes the InitialMatrix device property.  (gsdparam.c)

Version 3.25(beta) (1/24/95)
==================

Yet another bug-fix beta release.  There are still at least half a dozen
significant known bugs to be fixed before a public release.

Documentation
-------------

Notes that on Unix systems, one should not edit 'makefile', but should edit
the individual subfile and run tar_cat.  THIS IS A NON-BACKWARD-COMPATIBLE
CHANGE.  (make.doc)

Adds information on the Macintosh implementation.  (readme)

Procedures
----------

Fixes bugs:
	- make clean failed on Unix systems where rm -f requires at least one
file name.  (gs.mak)
	- math_.h was omitted from many dependency lists.  (gs.mak)

Drivers
-------

Fixes bugs:
	- The X Windows and MS Windows draw-line routines couldn't possibly
produce sufficiently correct output (since the interface only provides integer
coordinates).  (gdevx.c, gdevwddb.c)

In response to patent-related actions by Unisys and CompuServe, removes the
GIF driver.  (*.mak)

Changes dci_std_color (and std_device_std_color_* and prn_device_std_*) so
that if the number of bits per pixel is 32, the device is defined as CMYK
rather than RGB.  (gxdevice.h)

Removes the tseng8 device, which is no longer useful.  (devs.mak, gdevsvga.c)

Adds pseudo-alpha support to the SVGA drivers, via the TextAlphaBits and
GraphicsAlphaBits device parameters.  (gdevsvga.h, gdevsvga.c)

Adds a user-contributed driver for the Epson Stylus Color printer.  (devs.mak,
gdevstc.c, devices.doc)

Platforms
---------

Fixes bugs:
	- The VMS build scripts had gotten out of sync (again).  (vms*.mak)

Interpreter
-----------

Fixes bugs:
	- The emulator name array was incorrectly declared const in one place.
(gs.c)
	- A closed file could incorrectly appear to be 'eq' to another file
(open or closed).  (iutil.c)
	- If %stdin/%stdout/%stderr was ever closed, it couldn't be
reopened.  (gs_btokn.ps, gs_init.ps, files.h, zfile.c, zfileio.c, zfilter.c,
zfproc.c, ziodev.c)

Changes (almost) all the operator routines to 'static'.  (z*.c)

Library
-------

Fixes bugs:
	- The raster value for replicated tiles in the halftone cache was
incorrect, causing unaligned memory accesses.  (gxht.c)
	- stroke and strokepath could produce slightly inaccurate output
(leading to slight visible anomalies) as a result of stroke adjustment.
(gxstroke.c)
	- Attempting to draw an arc with zero radius could cause a numeric
exception.  (gspath1.c)
	- Setting the Orientation of a device to null resulted in actually
setting it to a random value.  (gsdparam.c)
	- charpath, stringwidth, and cshow attempted to remap the current
color unnecessarily.  (gschar.c)

Adds the ability to trace calls on the sqrt function (and possibly other math
functions in the future.)  (math_.h, gsmisc.c)

Adds additional interrupt checks in the banding code.  (gxclist.c, gxclread.c)

Version 3.24(beta) (1/17/95)
==================

This was supposed to be a public release, but too many bugs showed up in 3.23,
so this is another bug-fix beta release.  This is the first release with a
working PDF reader.

Documentation
-------------

Notes that Solaris requires using installbsd instead of install.  (make.doc)

Procedures
----------

Changes 'make mostlyclean' so that it doesn't delete the Ghostscript
executable (but deletes everything else that 'make clean' does).  (gs.mak)

Changes the link list generator so it eliminates duplicate library requests.
(genconf.c)

Factors the interpreter further so as to include less unnecessary PostScript
support in the PDF interpreter.  (gs.mak, zpath.c, zpath1.c)

Adds a printout of the available language interpreters to the -h message.
(genconf.c, gs.c, iinit.c, gs.mak)

Drivers
-------

Fixes bugs:
	- The alternate X drivers used a cast in an initializer, causing a
compilation error on some platforms.  (gdevxalt.c)

Adds a driver for the LaserJet IIID, including duplex printing if specified by
the Duplex page device parameter.  (gdevdjet.c)

Adds Orientation to the bit device.  (gdevbit.c)

Platforms
---------

Fixes bugs:
	- There was an extraneous pfen-> in the NT file system module, causing
a compilation error.  (gp_ntfs.c)
	- The DLL code referred to an obsolete symbol a_foreign.  (gsdll.c)
	- The VMS build scripts omitted the LaserJet 4 driver.  (vms-*.mak)
	- The VMS build scripts had several other minor errors.  (vms.mak)

Fonts
-----

Fixes bugs:
	- Defining a font alias in global VM with a name that was a string in
local VM caused an error.  (gs_fonts.ps)
	- The font compiler referred to an obsolete symbol a_foreign.
(font2c.ps)

Interpreter
-----------

Fixes bugs:
	- There was an extraneous '#' before an extern declaration.
(gsmain.c)
	- The interpreter could (incorrectly) attempt to expand the e-stack.
(istack.h, interp.c, istack.c)
	- zfproc.c called memcpy but didn't include memory_.h.  (zfproc.c)
	- A garbage collection occurring within a 'save' would often smash
memory.  (igc.c)
	- If the last character returned by the procedure of a procedure-based
filter was \r, readline could get an endless loop.  (zfileio.c)
	- Saving a change to a ref member of a structure confused the garbage
collector.  (isave.h, isave.c, zdict.c)
	- The -Zu debugging printout could cause an access error under rare
circumstances.  (isave.c)
	- Save objects could get allocated in global VM, causing dangling
references.  (zvmem.c)
	- The vmsave object created by the interpreter for a save didn't get
freed properly if the memory manager created an invisible save level, which
could cause the next garbage collection to crash.  (zvmem.c)
	- 'run' always printed an error message, rather than letting the
top-level control loop do it.  (gs.c, gs_init.ps)

Adds support for duplex devices.  (gxdevice.h, gsdparam.c, gs_statd.ps,
gs_setpd.ps)

Adds the beginnings of support for CID-keyed fonts.  (gs_cidfn.ps)

Changes the format of the stack dump printed for errors, to make it easier to
read.  (gs_init.ps)

Interpreter (PostScript)
------------------------

Fixes bugs:
	- The .local/global allocation operators always allocated in system
VM.  (zsysvm.c)
	- setpage[params] caused an error.  (gs_lev2.ps)
	- If an error occurred during a cshow or (x|y|xy)show, the interpreter
freed the enumerator twice.  (zchar.c, zchar2.c)

Changes setpageparams so that orientation = 0 means portrait.  This is not
compatible with AGFA's convention for roll-feed devices, but it is compatible
with the more common cut-sheet printers.  (gs_statd.ps)

Adds meaningful values for the Emulator resource.  (gsmain.c, gs_res.ps)

Makes -Z? validate the state of memory before and after save and restore.
(ialloc.h, igc.h, ialloc.c, igc.c, ilocate.c, zvmem.c)

Interpreter (PDF)
-----------------

Fixes bugs:
	- The Unix install script didn't install the PDF files if they were
present.  (unix-end.mak)
	- PDF to PostScript conversion didn't work at all.  (It still doesn't
work very well.)  (pdf_2ps.ps, pdf_main.ps)
	- Images with an Indexed color space and no Decode entry caused an
error.  (pdf_draw.ps)
	- The 'Page <n>' messages were printed even if QUIET was set.
(pdf_main.ps)

Changes the interpreter so that when it encounters an unknown operator, it
prints an error message and continues, rather than signalling an error.
(pdf_base.ps)

Makes F a synonym for f if there is nothing on the operand stack, to
compensate for a bug in some Adobe software.  (pdf_base.ps)

Changes pdfgetpage so it uses 1-origin rather than 0-origin indexing.  THIS IS
A NON-BACKWARD-COMPATIBLE CHANGE.  (pdf_main.ps)

Streams
-------

Fixes bugs:
	- The Group 3 2-D and Group 4 encoders produced incorrect output if a
scan line beginning with a black pixel was followed by a scan line beginning
with a white pixel.  (scfe.c)
	- A SubFileDecode filter with a count of 1 and a non-empty EOD string
would smash memory.  (sfilter1.c)

Updates the DCT filters so they will work with the latest version (5a) of the
IJG library.  (*.mak, jpeg.mak, sjpegerr.c)

Library
-------

Fixes bugs:
	- A call with integer parameters to a procedure with floating point
arguments didn't work on non-ANSI compilers.  (gsimage.c)
	- Arcs could get turned into polygons if the scaling values in the CTM
were very large and the radius was (in user space coordinates) very small.
(gspath.c)
	- The current point was defined when a BuildChar procedure was called.
(This bug was documented as fixed in version 2.2!)  (gschar.c)

Adds support for Orientation and Duplex page device parameters, for those
devices that support these.  (gdevprn.h, gxdevice.h, gsdevice.c, gsdparam.c)

Version 3.23(beta) (1/5/95)
==================

This is almost entirely a bug fix release.  It also includes a largely working
PDF reader.  This is intended as the beta test release for the next public
release.

Documentation
-------------

Fixes bugs:
	- COPYLEFT, COPYING, NEWS, PUBLIC, README, and the standard Fontmap
were omitted from the 3.22 fileset.

Documents the use of the -oldc switch to work around a compiler crash on
the DECstation.

Expands and clarifies the documentation for building the DesqView/X version
with djgcc.  (make.doc)

Adds documentation on the "600x300" H-P inkjet printers, explaining why
this alleged higher resolution is not available.  (devices.doc)

Adds to the PUBLIC license a warning that it is not a GNU License, and a
requirement to include a copy of or a pointer to the License in any written
material.  (PUBLIC)

Documents the fact that Ghostscript *does* attempt to look up files in the
current directory first.  (use.doc)

Procedures
----------

Fixes bugs:
	- In VMS.MAK, .JPEG should have been changed to .JPEG-5 in a few
places.  (vms.mak)

Adds the pjxl300 driver to all configurations that include the other color
DeskJet drivers.  Replaces pjet and pjetxl with pj and pjxl.  (*.mak)

Makes 'run' recognize PDF files if the PDF reader is included.
(pdf_main.ps)

Utilities
---------

Fixes bugs:
	- viewjpeg.ps needed the test for languagelevel = 2 at the
beginning of the file.  (viewjpeg.ps)
	- prfont.ps used 'min', which isn't a standard PostScript operator.
(prfont.ps)
	- prfont.ps created Encoding vectors that weren't 256 elements
long.  (prfont.ps)

Adds the gsdj500 script to the installation list.  (unix-end.mak)

Changes the Unix "line printer" shell scripts to add the date to the page
header.  (gsbj, gsdj, gsdj500, gslj)

Changes ansi2knr so that it will work properly on systems where the ctype
macros don't handle 8-bit characters correctly.  (ansi2knr.c)

Drivers
-------

Fixes bugs:
	- Some compilers don't allow casts in initialization expressions.
(gdevx.c, gdevxalt.c)
	- The cdj drivers didn't initialize the color_info structure
properly.  (gdevcdj.c)

Adds another alternate X Windows driver, x11mono, that is a black-and-white
device.  (devs.mak, gdevxalt.c)

Adds a user-contributed driver for the Apple Imagewriter LQ.  (devs.mak,
gdevadmp.c)

Platforms
---------

Fixes bugs:
	- The VMS MODULES.LIS file had gotten out of sync with the makefile
(again); GDEVABUF and GSBITOPS were missing.  (modules.lis)
	- The VMS script file had gotten out of sync with the makefile
(again).  (vms.mak)
	- The MS Windows platform code didn't recognize Windows 95 (Windows
4.0) as equivalent to Windows NT.  (gp_mswin.c)
	- File name enumeration didn't work on OS/2 or win32.  (gp_ntfs.c,
gp_os2.c)
	- -sOutputFile= didn't work under MS Windows.  (gp_mswin.c)

Changes the SCO Unix direct frame buffer driver so it generates in-line
instructions to access the frame buffer, for a dramatic speed improvement.
(gdevpcfb.h, gdevsco.c)

Fonts
-----

Fixes bugs:
	- If a font couldn't be found in the Fontmap, a recursion loop
sometimes occurred.  (gs_fonts.ps)
	- Aliases for global fonts weren't automatically created as global,
possibly leading to a recursion loop.  (gs_dps1.ps, gs_fonts.ps)
	- If a font was loaded into global VM within an inner save, the restore
deleted it from FontDirectory but not from SharedFontDirectory, causing a
possible recursion loop.  (gs_dps1.ps, gs_fonts.ps, idict.h, idict.c, zdict.c)

Further improves the algorithm for substituting for unknown fonts.
(gs_fonts.ps)

Interpreter (PostScript)
------------------------

Fixes bugs:
	- zcontrol.c had an assignment of const char * to const byte *,
which some compilers don't like.  (zcontrol.c)
	- Setting an Indexed color space based on a CIE space caused an
attempt to free a random block of memory.  (zcsindex.c)
	- Some compilers don't like mixing conditionals and casts in
initialization expressions.  (iref.h)
	- Some calculations of table sizes for string garbage collection
didn't work if sizeof(long) != 4, leading to smashed strings.  (iastate.h,
ialloc.c, igcstr.c)
	- Strings longer than about 7000 bytes smashed their chunk header
and confused the garbage collector.  (ialloc.c)
	- Some compilers needed iccfont.c to include strimpl.h.
(iccfont.c)
	- The obsolete file zcspace2.c was still included in the fileset.
	- If the command line included any @-files that required searching
the library path, a limitcheck would occur.  (zfile.c)
	- The insideness testing operators caused a memory access error,
because the procedure vector hadn't been updated to provide a default
get_alpha_bits procedure.  (zupath.c)
	- gcheck didn't check for stack underflow.  (zvmem2.c)
	- cleardictstack could fail to clear the dictionary stack if the
stack had overflowed into additional blocks.  (zdict.c)
	- If the '-' switch was selected, resources weren't released
properly on exit.  (gs.c)
	- Setting a Pattern color space based on a CIE space caused an
invalid memory access.  (zcsindex.c)
	- The garbage collector didn't treat refs properly on machines with
short ints.  (igcref.c)
	- Operators with more than 16 arguments could break the
interpreter.  (interp.h, iinit.c, interp.c)
	- save/restore didn't restore the setting of the current allocator
VM (local/global).  (isstate.h, isave.c)
	- stdpre.h declared exit as an extern, instead of letting gsmain.c
declare it.  (stdpre.h, gsmain.c)
	- gs.c used fputs to print help messages rather than fprintf.
(gs.c)
	- Interrupts failed to re-execute the operation that was
interrupted.  (interp.c)
	- Low-resolution CMYK devices didn't use separate screens for each
color plane as the default.  (gs_init.ps)
	- filterdict wasn't getting undef'ed at the end of initialization.
(gs_init.ps)
	- gstate operations were broken (bug introduced in 3.02).
(zdevice2.c)
	- resourceforall didn't remove the resource dictionary from the
dictionary stack when calling the client-supplied procedure.  (gs_res.ps)
	- currentcolor with an Indexed color space returned a real rather
than an integer.  (zcolor2.c)
	- setshared / setglobal left the stack in an unobvious state if
they were given a non-Boolean argument.  (gs_dps1.ps)
	- sethalftone followed by currenthalftone returned an invalid value.
(zht2.c)
	- Empty strings produced spurious garbage collector error messages.
(gsstruct.h, scommon.h, igc.c, igcstr.c, iname.c)
	- The garbage collector didn't trace Separation color spaces properly.
(gscsepr.c)

Changes defineresource so that it does not, by default, make instances
read-only.  (gs_res.ps)

Adds .{local,global}{array,dict,packedarray,string} operators for creating
objects in a specific VM space.  (zsysvm.c, gs_dps1.ps)

Adds definitions of setpage and setpageparams to statusdict.  (gs_setpd.ps,
gs_statd.ps)

Alleviates some performance problems in the garbage collector.  (igc.c)

Interpreter (PDF)
-----------------

Fixes bugs:
	- PDF files that used filters with parameters caused a typecheck
error because the arguments to 'filter' were reversed.  (pdf_base.ps)
	- The (undocumented) PDF 1.1 ability to specify link and annotation
destinations indirectly was not supported.  (pdf_main.ps)
	- The (undocumented) PDF ability to specify a null page in a link
destination was not supported.  (pdf_main.ps)
	- The PDF encodings weren't loaded properly in a system with both
PS Level 2 and PDF features.  (gs_res.ps, gs_init.ps)
	- If the next line after a stream keyword was blank, the line
wasn't skipped, which matters for binary data.  (pdf_base.ps)
	- A Q operator with no matching q operator caused an error.
(pdf_draw.ps)
	- The text position wasn't preserved across a fill or stroke
operator.  (gs_pdf.ps, pdf_draw.ps)
	- Embedded Type 3 fonts didn't work.  (pdf_base.ps, pdf_draw.ps,
pdf_main.ps)
	- Masked images with no Decode value had their polarity inverted.
(pdf_draw.ps)
	- Embedded Type 1 fonts referenced from within a stream didn't
work.  (pdf_font.ps)

Changes the PDF code so that it automatically recognizes PDF files as such.
(pdf_main.ps)

Splits out the PixelDifference filters as a separate "feature".  (gs.mak)

Streams
-------

Fixes bugs:
	- Closing the primary input stream caused an invalid memory access.
(stream.c)
	- Increasing the size of a buffer within a save resulted in a
dangling reference after the restore.  (files.h, sfilter.h, zfile.c,
zfilter.c)
	- The garbage collector didn't properly trace streams that referenced
strings directly.  (stream.h, stream.c, ziodev.c)

Library
-------

Fixes bugs:
	- An extraneous \ upset some compilers.  (gdevabuf.c)
	- Uncolored Patterns that completely filled their bounding box
caused an invalid memory access.  (gspcolor.c)
	- If a color image required clipping, black or white pixels might
be rendered with incorrect (random) colors.  (gxcpath.c)
	- Reference counts for color spaces were sometimes set too high, so
they would only be freed by restore or garbage collection.  (gscolor.c)
	- The character cache could get confused if the Encoding for the
character wasn't a name.  (gschar.c)
	- Character outlines were always rendered with flatness = 0,
causing very bad performance for large characters.  (gzstate.h, gschar.c,
gsimage.c, gxfill.c, gxstroke.c)
	- If a device (presumably uninitialized) had a
color_info.num_components of zero, an invalid memory access could occur.
(gsdparam.c)
	- Intersecting clipping paths that are not both rectangular didn't
properly set the outer box of new clipping path, leading to unnecessary
computation.  (gxcpath.h, gxacpath.c, gxcpath.c)
	- A call passed false instead of NULL.  (gschar.c)
	- On machines where sizeof returns a long, genarch.c failed.
(genarch.c)
	- xfonts were consulted, incorrectly, even for stroked characters.
(gxccman.c)
	- gstate/currentgstate/setgstate didn't work properly.  (gsline.c,
gsstate.c)
	- On CMYK devices needing halftoning, colors with C = M = Y were
always converted to gray shades.  (gxcmap.c)
	- Isolated horizontal lines, or the horizontal edges of rectangles,
could get drawn with one or both end pixels missing.  (gxfill.c)

Changes the character cache back so it oversamples characters at small
sizes.  (gschar.c)

Changes all occurrences of (void)x to discard(x), and defines discard in
stdpre.h as a cast to void, to make it possible to pacify compilers that
don't accept this construct for some kinds of x.  (gpcheck.h, stdpre.h,
store.h, gdevmswn.c, gp_mswin.c, gscoord.c, gxclread.c, igc.c, sfile.c,
sfileno.c, zcie.c, zht2.c, ziodev.c, zmisc1.c)

Increases the size of the halftone cache on large-memory machines from 35K
to 100K.  This substantially improves halftoning performance at higher
resolutions.  (gxht.c)

Version 3.22(beta) (11/30/94)
==================

This is primarily a bug fix release.  It also includes limited anti-aliased
graphics capability.  This release was not distributed to the public.

Procedures
----------

Fixes bugs:
	- The definition of ghost_h was misplaced, so changes in it or its
antecedents didn't force recompilation of its dependents.  (gs.mak)

Actually implements the -Z+ switch, for forcing small stack blocks.
(interp.c)

Makes the -dSAFER switch disable the %pipe syntax for file names, even for
reading.  (gs_init.ps)

Drivers
-------

Fixes bugs:
	- The dfax drivers incorrectly set EncodedByteAlign to false.
(gdevdfax.c)
	- softwareValue and dateTimeValue were declared as byte rather than
char.  (gdevtfax.c)

Platforms
---------

Fixes bugs:
	- The VMS DEC C compilers declare delete in unixio.h, and doesn't
declare unlink anywhere.  (stdio_.h)
	- The VMS compilers declare malloc and free in stdlib.h, which
wasn't being included in malloc_.h.  (malloc_.h)
	- The SCO Unix C compiler needs both <sys/time.h> and <time.h>.
(time_.h)
	- The VMS compilers declare abs in stdlib.h, which wasn't being
included anywhere.  (gshtscr.c)
	- The definition for A4 paper in VMS-AXP.MAK was incorrect.
(vms-axp.mak)

Renames VMS-AXP.MAK as VMS-DECC.MAK, with some changes that make it
appropriate for DEC C on both VAX and AXP platforms.  (vms-axp.mak =>
vms.decc.mak)

Fonts
-----

Fixes bugs:
	- gs_kanji.ps got an invalidaccess error.  (gs_kanji.ps)

Interpreter
-----------

Fixes bugs:
	- An off-by-1 test in the roll operator caused it to smash the
stack if the operand stack had overflowed into additional blocks.
(zstack.c)
	- The default CIE color rendering dictionary didn't assume a
reasonable intermediate (XYZ) space.  (gs_lev2.ps)
	- CIE color mapping tables weren't traced properly by the garbage
collector.  (gscie.h, gscie.c, zcie.c)
	- If the very last character of a file was a ^M, the scanner
(incorrectly) signaled a syntaxerror.  (iscan.c)
	- If an operator could return both a typecheck and a
stackunderflow, it always returned a stackunderflow, which doesn't match
the behavior of Adobe interpreters.  (opcheck.h, idparam.c, interp.c,
iutil.c, z*.c)
	- astore, dictstack, and execstack could return a spurious
invalidaccess error (or fail to detect an invalid access) if the operand
stack had overflowed into additional blocks.  (istack.c)
	- The garbage collector didn't relocate pointers to names!  (Bug
introduced in 3.20.)  (iname.h)
	- If the dictionary stack overflowed into additional blocks, the
cached value pointer for a name could get set incorrectly, and also not get
relocated by the garbage collector.  (idict.c)
	- If the dictionary stack overflowed into additional blocks, the
post-GC fixup of cached value pointers in names could cause an addressing
error.  (igc.c)
	- With the -Z? switch set, the garbage collector could incorrectly
report that objects or strings weren't in any chunk.  (igc.c)
	- << /a 1 /a 2 >> /a get gave the value 2 rather than 1.
(gs_init.ps)
	- Numbers in binary object sequences and encoded number arrays
didn't work properly on machines where sizeof(short) != 2 or sizeof(long)
!= 4.  (ibnum.c)
	- The put operator for dictionaries allowed null as a key.
(idict.h, idict.c)
	- >> didn't give an error if there were an odd number of values on
the stack above the next mark.  (gs_init.ps)
	- Operations that explicitly freed ref objects (setting a CIE
colorspace, resizing a dictionary, popping a block off a stack) could
corrupt storage.  (ialloc.c)
	- The -Z@ switch, which fills freed blocks with a recognizable bit
pattern, could incorrectly overwrite freed blocks in previous save levels,
causing invalid memory accesses.  (ialloc.c)
	- Since streams freed by a restore weren't marked as free, they
could confuse the garbage collector and lead to invalid memory accesses.
(zfile.c)
	- If one of the built-in dictionaries overflowed during
initialization, no error was reported -- entries were simply discarded.
(iinit.c)
	- If the level2.dev feature was combined with certain other
features, the current languagelevel was 2 when some gs_*.ps files were
loaded, causing them to load incorrectly.  (gs_btokn.ps, gs_setpd.ps)
	- If readline read a line that ended with only a CR (no LF)
followed by an end-of-file, it incorrectly closed the stream.  (zfileio.c)

Adds a .cond operator, similar to the Lisp multi-arm conditional.
(zcontrol.c)

Adds a .makeglobaloperator operator, allowing the definition of operator
procedures in local VM that turn into global operators, provided the save
level is zero.  (iref.h, opdef.h, iinit.c, interp.c, zmisc.c)

Note: the fix for returning typecheck vs. stackunderflow requires that all
operators (or other code) that uses return_error(e_typecheck) to indicate
an incorrect object type on the operand stack must change this to
return_op_typecheck(op), where op points to the operand.  THIS IS A
NON-BACKWARD-COMPATIBLE CHANGE.

Implements string array and name array parameters for parameter lists.
(gsparam.h, iparam.c)

Brings filterdict inside the INITIAL_DICTIONARIES conditional.  (iinit.c)

Adds a .currentscreenlevels operator that returns the number of
distinguishable halftone levels.  (zht.c)

Streams
-------

Fixes bugs:
	- The 2-D case of CCITTFaxDecode could get confused by an input
data buffer boundary that fell immediately after a horizontal code.
(scfd.c)
	- The LZW decoder didn't detect invalid data unless DEBUG was
selected at build time.  (slzwd.c)

Library
-------

Fixes bugs:
	- The clipping region accumulator could refer to a clipping
rectangle even after it had been freed.  (No effect on execution unless the
-Z@ switch was selected.)  (gxacpath.c)
	- setbbox expanded the bounding box, but didn't place a limit on
further path elements, if the current path wasn't empty.  (gsdps1.c)
	- setbbox didn't make sufficient allowance for rounding.
(gsdps1.c)

Implements the ProcessColorModel parameter (read-only) for all devices.
(gsdparam.c)

Adds a gs_currentscreenlevels procedure that returns the number of
distinguishable halftone levels.  (gsht.c)

Version 3.21(beta) (11/17/94)
==================

This is primarily a bug fix release.  It also includes a substantial
improvement in the Type 1 font hinting algorithms.  This release was not
distributed to the public.

Documentation
-------------

Fixes bugs:
	- The `man' page referred to gnu.ghostscript.bug rather than
comp.lang.postscript.  (gs.1)

Documents the special entries in operator definition tables that allow
switching dictionaries.  (opdef.h)

Procedures
----------

Moves the definition of JSRCDIR to the individual platform makefiles, to
make it easier to change on platforms that don't have file links.  (*.mak)

Utilities
---------

Fixes bugs:
	- ansi2knr didn't recognize that a line ending with } couldn't be a
function definition.  (ansi2knr.c)
	- ps2epsi always returned an empty bounding box.  (ps2epsi,
ps2epsi.bat)

Drivers
-------

Fixes bugs:
	- The bitrgb device had an invalid depth of 3.  (gdevbit.c)

Replaces the color mapping code in the X driver with a much faster
algorithm, courtesy of Tim Theisen.  (gdevx.h, gdevx.c, gdevxini.c)

Platforms
---------

Fixes bugs:
	- Two variable names were misspelled.  (gdevpm.c, gp_mswin.c)
	- It wasn't possible to compile a non-DLL configuration under OS/2.
(os2.mak)
	- Compilation under Microsoft C/C++ 8.0 gave errors.  (gp_mswin.h,
gp_mswin.c, gshtscr.c)

Adds some more devices to the OS/2 makefile.  (os2.mak)

Fonts
-----

Fixes bugs:
	- wrfont.ps, and hence bdftops, didn't write out the FontType or
PaintType.  (Bug introduced since 2.6.1)  (wrfont.ps)
	- wrfont.ps omitted a 'begin' and 'end', causing -! or -| to be
undefined when the font was loaded.  (Bug introduced since 2.6.1)
(wrfont.ps)

Interpreter
-----------

Fixes bugs:
	- make_tasv_old called make_tasv_new with extra arguments.
(store.h)
	- currentcacheparams only returned 2 values instead of 3.
(zfont.c)
	- ustroke popped one element too many off the stack if a matrix was
supplied.  (zupath.c)
	- inu[eo]fill popped one element too many off the stack.
(zupath.c)
	- The color rendering dictionary was initialized to null rather
than a valid dictionary.  (gs_lev2.ps)
	- An invalid IODevice resource named "9" got created.  (gs_res.ps)
	- bytesavailable often caused an error rather than returning -1.
(zfileio.c, stream.c)
	- The insideness testing operators always returned true if the
aperture was defined by a user path rather than a point.  (zupath.c)
	- If INITIAL_DICTIONARIES was defined in the makefile, the
definition of the initial_dictionaries array was missing a comma.
(iinit.c)
	- Even if userdict appeared in INITIAL_DICTIONARIES, gs_init.ps set
its maxlength to 200.  (gs_init.ps)
	- Setting a CIE color space left a garbage value on the stack.
(zcie.c)
	- If a file or filter was opened and then closed, opening a file
subsequently within a 'save' could lead to a memory access error in the
garbage collector.  (zfile.c)
	- Setting an Indexed or Separation color space could cause a crash
either in the garbage collector or when printing out the e-stack.
(icsmap.h, zcsindex.c, zcssepr.c)
	- Invoking a filter with an invalid data source or sink could cause
a memory access error (bug introduced in 3.20).  (zfilter.c)
	- Invoking stringwidth on a font whose BuildChar procedure did a
save could cause a memory manager error or infinite loop, because
stringwidth attempted to use an inapplicable shortcut.  (gschar.c)
	- The bounding box for rendering stroked Type 1 characters didn't
take square caps and miter joins into account.  (gs_type1.ps)
	- Invoking filter with DCTDecode or DCTEncode could cause an
addressing error if no dictionary argument was supplied.  (zfdctd.c,
zfdcte.c)
	- The Generic resource, the Font resource, and half a dozen
resources with no predefined instances all shared the same Instances
dictionary.  (gs_res.ps)
	- The temporary null device allocated for stringwidth was never
freed.  (gschar.h, gschar.c, zchar.c)
	- Internal operators, and structures that might be freed on stack
unwinding, could "escape" from the e-stack.  (zcontrol.c, ztype.c)
	- makefont and scalefont didn't properly handle a font whose
Encoding had been changed.  (bfont.h, zfont.c, zfont2.c)
	- Type 1 fonts with PaintType = 2 incorrectly checked for an xfont.
(gxfont.h, gschar.c, gsfont.c, zchar1.c, zfont1.c, zfont2.c)
	- Specifying a string argument with -d...=(...) or -d...=<...>
would cause an invalidaccess error.  (gs.c)
	- The environment for encapsulated jobs didn't rebind quit to stop
in userdict.  (gs_lev2.ps)
	- restore didn't deal properly with open files on the e-stack.
(zvmem.c)
	- Even with the '-' switch, Ghostscript would try to read ahead in
the input stream rather than processing input character-by-character.
(ziodev.c)
	- If an error occurred with a unreadable dictionary on any stack,
the standard error printer would get into an error loop and exit the
interpreter.  (gs_init.ps)
	- The for_roots macro in igc.c used ap rather than mem as its
second formal parameter.  (This typo had no effect on the executable
program.)  (igc.c)
	- If saving the stacks for an error caused a GC request, a value
could get stored into an improper variable on the C stack, causing havoc.
(interp.c)
	- setdash checked to make sure that the distance array had read
access; Adobe interpreters don't check this.  (zgstate.c)
	- The roots for gs_run_string and gs_interpret weren't registered
properly, which could cause a dangling reference in the case of a restore
whose save had been done earlier.  (gsmain.c, interp.c)

Adds an OpenOutputFile Boolean device parameter for printer devices; if
true, the device opens the OutputFile at the time the device is opened,
instead of waiting for the first showpage.  This helps with synchronization
when the OutputFile is a pipe.  (gdevprn.h, gdevprn.c)

Changes the BEGIN/END_OP_DEFS macros to require an explicit { and } at each
use.  (gsmain.c, interp.c, z*.c)

Arranges things so that the operators that the interpreter handles
specially are assigned the first N operator indices [internal change only].
(interp.h, iinit.c, interp.c)

Changes the operators max and min to .max and .min, to avoid conflicts with
PostScript programs that use these names for variables and also use 'bind'.
THIS IS A NON-BACKWARD-COMPATIBLE CHANGE from programs that depend on
'bind' binding in these operators; however, we have also defined procedures
max and min that just call the operators, which should take care of any
ordinary code.  (*.ps, zrelbit.c)

Streams
-------

Fixes bugs:
	- The pfb_state pointer in the eexecDecode filter state wasn't
marked as traceable for the garbage collector.  (sfilter.h)
	- The eexec decoding filter could access invalid memory or return
garbage under some conditions.  (Bug introduced in 3.12.)  (zmisc1.c)
	- The eexec decoding filter would incorrectly ask for more input if
the output buffer was full.  (seexec.c)

Library
-------

Fixes bugs:
	- Some compilers reserve the word 'try'.  (gshtscr.c)
	- Some compilers don't like line continuations (\) within a
preprocessor macro formal parameter list.  (gdevprn.h, gxdevice.h)
	- Memory devices created with an inverted palette (0=white,
1=black) interchanged white and black in fill operations.  (gdevmem1.c)
	- The 'bits' variable in mem_mono_copy_mono was unused on
little-endian machines.  (gdevmem1.c)
	- Some garbage collector procedures were declared 'private'
inconsistently.  (gscie.c)
	- The new anti-aliased text capability accidentally caused all
characters to be oversampled.  (gschar.c)
	- Type 1 fonts with PaintType = 2 and StrokeWidth = 0 came out with
many pixels missing because of oversampling.  (gschar.c)
	- Type 1 font stem hints were not being processed correctly.
(gstype1.h, gxtype1.h, gstype1.c, gxhint2.c, gxhint3.c, gxpath.c)
	- The tracing message for 9/7 composite fonts incorrectly
identified them as 1/7 fonts.  (gschar0.c)
	- If a 1/7 or 9/7 composite font was a child of a non-modal font,
the font number of the child font was computed incorrectly.  (gschar0.c)

Splits up the various memory devices into one file per depth [internal
change only].  (gdevm*.c)

Version 3.20(beta) (10/31/94)
==================

This version contains some support for a PDF interpreter; however, the PDF
code itself is not ready for release yet.  It also includes anti-aliased text
capability.  This release was not distributed to the public.

Documentation
-------------

Notes that the FAQ has moved to smallo.ruhr.de:pub/ghost/gs.faq.  (readme)

Documents various implementation limits.  (language.doc)

Procedures
----------

Fixes bugs:
	- bcp.dev wasn't included in the list of dependencies for
level1.dev.  (gs.mak)

Changes the printout of version numbers so that it is always A.BC,
rather than A.B if C is zero.  (gs.c, gs_init.ps)

Utilities
---------

Fixes bugs:
	- font2c didn't correctly handle Metrics or Metrics2 dictionaries
whose entries were arrays rather than scalars.  (font2c.ps, ccfont.h,
iccfont.c)
	- font2c didn't handle CDevProc.  (font2c.ps, ccfont.h, iccfont.c)
	- genconf could get a stack overflow on small machines.
(genconf.c)

Changes mergeini.ps so it can take arguments on the command line specifying
the input and output files.  (mergeini.ps)

Adds a gsdj500 shell script to parallel gsdj500.bat.  (gsdj500)

Drivers
-------

Fixes bugs:
	- The X driver didn't mask dynamically assigned colors properly, so
it could request the same color over and over again.  (gdevx.c)

Adds two alternate X Windows drivers, for helping debug drivers with other
color models:
	- x11alpha, an RGB device with 4-bit alpha capability (for
	  copy_alpha only);
	- x11cmyk, a 1-bit-per-component CMYK device.
(devs.mak, gdevxalt.c)

Changes the left margin of the lj4dith driver to 0.26".  (gdevcdj.c)

Platforms
---------

Fixes bugs:
	- If <sys/time.h> didn't exist, time_.h didn't always include
<time.h>.  (time_.h)
	- The OS/2 platform wouldn't compile.  (gdevpm.c)
	- The auxiliary VMS command files sometimes got blank lines
inserted when going through EOL conversion.  (vms.mak; delete gs_.com)
	- The VMS makefiles didn't include the Level 1 operators in
level1.dev.  (vms.mak)
	- The VMS gcc makefile didn't handle undefined DEVICE_DEVSn
variables properly.  (vms*.mak)
	- The VMS makefiles didn't recognize DEVICE_DEVS{1,2,5,7}.
(vms.mak)

At the request of a Unix expert, changes all the Unix shell scripts to use
exec gs ... "$@" rather than gs ... $*.  (gsnd, gsbj, gsdj, gslj, gslp)

Modifies the JPEG library so that it uses 4K less of the automatic data
segment in 16-bit environments.  (bcwin.mak, jpeg.mak, sjpeg.c, sjpegerr.c)

Adds the bmp drivers back into the 16-bit MS Windows executable, since they
will fit now.  (bcwin.mak)

Fonts
-----

Makes the font substitution algorithm recognize the word Roman as calling
for a serif font.  (gs_fonts.ps)

Interpreters
------------

Fixes bugs:
	- The fix in 3.13 for the inexact function values at 0 didn't work.
(zcontrol.c)
	- Level 1 configurations referenced an undefined procedure
gs_currenthalftone.  (gsht.c, gsht1.c)
	- Specifying any device properties (including -r and -g) on the
command line caused an error.  (gs_init.ps)
	- The forward declaration of cfont_name_array_create was
incorrect.  (iccfont.c)
	- save and restore could get called before the graphics state stack
had been initialized properly.  (gs_mex_e.ps)
	- Some encodings weren't loaded properly.  (gs.mak, gs_mex_e.ps,
gs_mro_e.ps, gs_pdf_e.ps, gs_wan_e.ps)
	- Zero-height images were allowed, but zero-width images
weren't.  (zpaint.c)
	- Neither zero-width nor zero-height images popped their
arguments from the operand stack.  (zpaint.c)
	- lib_file_fopen overwrote its file name argument, causing havoc
with @-files.  (gxiodev.h, gdevpipe.c, gsiodev.c, zfile.c)
	- The garbage collector got confused if there were any arrays or
dictionaries with 8K or more elements.  (igcref.c)
	- >> could leave the stacks in a questionable state if it failed.
(gs_init.ps)
	- The Category resource category didn't implement undefineresource.
(gs_res.ps)
	- When the token operator read the last token from a string, it
left an unchanged string on the stack instead of an empty string.
(stream.c)
	- noaccess didn't give an invalidaccess error when applied to the
permanent dictionaries.  (dstack.h, idict.c, ztype.c)
	- Overflowing the exec stack wasn't handled properly.  (istack.h,
istack.c)
	- The garbage collector cleared the cached value pointers in names,
causing interpretation to slow down substantially.  (idict.c, igc.c,
iname.c)
	- 0 dict created a dictionary with a maxlength of 1.  (idict.c)

Changes the default size of the execution stack from 150 to 250, to match
the Adobe "typical" value.  (interp.c)

Moves the operator definitions out of the automatic data segment.
(opdef.h, iinit.c, z*.c)

Adds operators that allow creation of objects in system space:
.systemvmstring, .systemvmarray, .systemvmpackedarray, .systemvmdict,
.systemvmcheck.  (zsysvm.c)

Renames gcdefs.h as gscdefs.h.

Allocates names in system space rather than global space.  (gsmain.c)

Changes the memory manager so that it allows programs to create objects in
system space.  (iref.h, iutil.h, ivmspace.h, ...)

Changes the implementation of filters so they appear in their own
dictionary named filterdict.  (gs_init.ps, z*.c)

Changes the implementation of color spaces so each one has its own
setcolorspace procedure, defined in a new dictionary named
colorspacedict.  (gs_lev2.ps, z*.c)

Adds a new debugging switch, $, that always initializes all fields in a
ref, in order to keep Purify happy.  (store.h)

Library
-------

Fixes bugs:
	- The page size for image devices was always set to (0, 0).
(gsdevice.c)
	- The PageSize computation in gx_default_put_params could overflow
on 16-bit machines.  (gsdparam.c)
	- An omitted 'static' on an initialized array caused a compiler
error.  (gxccman.c)
	- If interpolated image rendering was requested but not
actually carried out, gs_image_cleanup could attempt to free a random
pointer.  (gsimage.c)
	- Some compilers only retain 23 characters of procedure names, but
some procedure names weren't unique in the first 23 characters.  (gscie.c,
gscolor.c, gscolor1.c, gxcmap.c)
	- The garbage collector didn't trace device colors properly.
(gxdcolor.h, gzht.h, gsimage1.c, gspcolor.c, gxcht.c, gxcmap.c, gxdraw.c,
gxht.c)
	- For CMYK devices, the transfer functions were being applied to
the CMYK values rather than the complemented RGBW values.  (gxcmap.c)
	- Memory devices used their own color mapping procedures rather
than those of the target; this could cause incorrect colors for patterns on
devices with more than 1 bit per pixel.  (gxdevmem.h, gdevmem1.c, gdevpm.c,
gdevprn.c, gdevwdib.c, gschar.c, gsdevice.c, gxccache.c, gxccman.c,
gxclip2.c, gxclread.c, gxpcmap.c)
	- The garbage collector didn't trace image enumerators properly in
the image_render_simple case.  (gsimage.c)
	- stroke produced different-looking output for thin (zero-width)
lines depending on whether or not clipping was invoked.  (gxstroke.c)
	- If a clipping list changed from multiple rectangles to a single
rectangle, it could fail to clip properly thereafter.  (gxacpath.c)

Adds two new device procedures: alpha_bits and copy_alpha.  This change is
backward-compatible for all existing devices.  (gdevmem.h, gxdevice.h,
gsdevice.c, gxclip2.c, gxclist.c, gxcpath.c)

Changes the implementation of color halftones so that, when appropriate, it
generates a single cell and uses the device tile_rectangle procedure.
(gzht.h, gsht.c, gxcht.c, gxclist.c, gxclread.c)

Adds partial support for the Orientation page device parameter.
(gsdevice.c)

Adds support for anti-aliased characters using 2 or 4 bits of alpha.
(gxfcache.h, gschar.c, gxccache.c)

Version 3.13(private) (10/3/94)
=====================

This release was created for a customer; it was not distributed to the
public.

Documentation
-------------

Notes in make.doc that the file names in the IJG archive distributed with
Ghostscript do not include the gsA.BC/ prefix.  (make.doc)

Adds a cross-reference to make.doc to the Watcom makefiles.  (watc.mak,
watcwin.mak, wccommon.mak)

Procedures
----------

Fixes bugs:
	- The makefile rule for gconfig.h et al had a couple of blank lines
in the middle of it.  (gs.mak)

Utilities
---------

Fixes bugs:
	- wrfont.ps didn't add a lenIV entry to the Private dictionary if
it was needed.  (wrfont.ps)

Adds a packfile.ps utility that allows compressing multiple files into a
single file for environments with very little permanent storage.
(gs_pfile.ps, packfile.ps, wrfont.ps)

Drivers
-------

Fixes bugs:
	- The {tiff,fax}{g32d,g4} devices could produce incorrect output.
See under Streams below.
	- The dfax drivers referred to the obsolete structure member
EncodedEOLAlign.  (gdevdfax.c)

Changes the default bit order for TIFF/F output to little-endian, which is
apparently what the majority of TIFF decoders like best.  The bit order for
the fax drivers is still big-endian.  (gdevdfax.c, gdevtfax.c)

Platforms
---------

Fixes bugs:
	- The VMS build script used -a rather than -w for creating
gconfig_.h.  (vms.mak)
	- The VMS build script didn't create gconfigv.h.  (vms.mak)
	- The VMS Fontmap had incorrect entries for the Bitstream Charter
fonts.  (fontmap.vms)
	- The VMS MODULES.LIS file assumed the JPEG library files were in
directory JPEG rather than JPEG-5.  (modules.lis)

Fonts
-----

Fixes bugs:
	- Using DISKFONTS resulted in an invalidaccess error.
(gs_fonts.ps)

Interpreter
-----------

Fixes bugs:
	- The standard transfer function considered gray values above
roughly 0.994 equivalent to white; 0.999 is a better value.  (gs_init.ps)
	- The transfer, black generation, and undercolor removal functions
gave slightly inexact results for an input value of 0.  (zcolor.c,
zcontrol.c)
	- setpagedevice gave an /undefined error if it did not recognize a
key, rather than ignoring the key.  (zdevice.c, gs_init.ps, gs_lev2.ps,
gs_setpd.ps)

Changes .putdeviceparams to take an additional argument, a Boolean that
says whether or not unrecognized keys should be reported as /undefined
errors.  THIS IS A NON-BACKWARD-COMPATIBLE CHANGE; however, no user-written
code should be calling .putdeviceparams.  (zdevice.c)

Streams
-------

Fixes bugs:
	- The Group 3 2-D and Group 4 fax encoders could emit incorrect
output.  (scfe.c)
	- The algorithm for constructing optimal Huffman codes could
produce invalid codes in some rare cases.  (shcgen.c)

Library
-------

Fixes bugs:
	- Rectangles closed with lineto rather than closepath weren't
recognized as rectangles.  (This only affected performance, not
functionality.)  (gxpath2.c)
	- The xfont lookup_font procedure could get called with a matrix
whose translation components had never been initialized.  (gxccman.c)
	- Some compilers don't allow \ in the formal argument list of a
preprocessor macro.  (gdevprn.h, gxdevice.h)

Version 3.12 (9/29/94)
============

This is another bug fix release, the first Level 2 release that we believe
is reasonably reliable.

Documentation
-------------

Adds some text warning about making copies of the makefile.  (make.doc)

Procedures
----------

Fixes bugs:
	- There were a number of unnecessary dependencies on $(MAKEFILE) in
gs.mak, left over from before the existence of gconfigv.h.  (gs.mak)
	- JPEGSRC was defined in gs.mak rather than in jpeg.mak.  (gs.mak,
jpeg.mak)

Changes the version numbering scheme back to A.BC, since people seem to be
adapting to the change, and this allows using the version number directly
as a MS-DOS directory name.  (gconfig.c, gdevtfax.c, gs.c, gs_init.ps)

Updates the JPEG library to version 5 (official release) of the IJG code.
(jpeg/*, jpeg.mak)

Drivers
-------

Fixes bugs:
	- The TIFF/F driver put out invalid PageNumber and Software
entries.  (gdevtifs.h, gdevtfax.c)
	- The TIFF/F and fax Group 3 2-D drivers used K=3 and K=5 instead
of K=2 and K=4.  (gdevtfax.c)
	- The TIFF/F and fax Group 3 2-D drivers emitted improperly aligned
output.  (See under Streams below.)
	- The MS Windows driver didn't resize the window properly in
response to changing the device parameters.  (gdevmswn.c)

Because of complementary bugs in various C compilers, changes all the
non-printer devices to use a different set of macros.  (gdevmem.h,
gdevpcfb.h, gdevprn.h, gdevsvga.h, gxdevice.h, gdev{3b1, bgi, herc, l256,
pe, pm, sun, vglb, wddb, wdib, wprn, x}.c, gsdevice.c, gxacpath.c,
gxclip2.c, gxcpath.c, gxpcmap.c, zupath.c)

Changes the X11 driver to ignore the "margins" specified by Ghostview.
This is apparently necessary for Ghostview to handle landscape display
properly.  (gdevxini.c)

Adds a WindowID parameter to the X11 device, to allow setting the window
for the output.  (gdevx.h, gdevx.c, gdevxini.c)

Platforms
---------

Fixes bugs:
	- The definition of BEGINFILES in os2.mak occurred too late in the
file to have the desired effect.  (os2.mak)

Interpreter
-----------

Fixes bugs:
	- Updating the list of allocated file objects at a restore didn't
clear the prev pointer of the new head, which could cause the garbage
collector to encounter an invalid pointer.  (Bug introduced by .forgetsave
in 3.0.3.)  (zfile.c)

Streams
-------

Fixes bugs:
	- The CCITTFaxEncode filter with K > 0 and EncodedByteAlign = true
incorrectly aligned the 1-D/2-D bit as the last bit of a byte, rather than
the first bit.  (scfx.h, scfe.c)
	- eexec could loop indefinitely under certain conditions.
(seexec.c)
	- eexec's algorithm for recognizing text vs. binary encoding didn't
work properly in some cases that don't conform to the Adobe Type 1 Font
Format documentation.  (seexec.c)
	- Closing a stream didn't clear out the strm and state pointers,
which could cause invalid accesses by the garbage collector.  (stream.c)

Library
-------

Fixes bugs:
	- fill_loop could loop indefinitely under certain conditions.
(Introduced by a bug fix in 3.1.)  (gxfill.c)
	- fill/eofill sometimes failed to paint parts of a region.
(Introduced by a bug fix in 3.1.1.)  (gxfill.c)
	- Non-convex clipping paths sometimes omitted thin horizontal
slivers of the region.  (Probably introduced by the "thin graphics" fix in
3.1.)  (gxacpath.c)

Version 3.1.1 (9/25/94)
=============

This is primarily a bug fix release.  It was originally intended for some
commercial licensees, but beta testers found too many problems with it.

Documentation
-------------

Fixes bugs:
	- NEWS didn't indicate that there was a non-backward-compatible
change in the gx_device structure -- specifically, that l_margin,
b_margin, r_margin, and t_margin were replaced by macros named
dev_l_margin(dev), etc.  (news)

Describes the two-phase commit requirement for device put_params
procedures.  (drivers.doc, gsparam.h)

Procedures
----------

Fixes bugs:
	- The new S macro in genarch.c didn't work on compilers that do
macro substitution within string constants (which is forbidden by the ANSI
standard).  (genarch.c)

Drivers
-------

Fixes bugs:
	- Driver put_params implementations didn't observe a "two-phase
commit" discipline; this could lead to the current device in the graphics
state being closed, and other inconsistencies.  (gsparam.h, gxdevice.h,
iparam.h, gdevbit.c, gdevcdj.c, gdevmswn.c, gdevpcfb.c, gdevpm.c,
gdevprn.c, gdevx.c, gsdevice.c, gsdparam.c, zdevice.c, ziodev2.c, zmisc2.c)
THIS IS A NON-BACKWARD-COMPATIBLE CHANGE; however, it only affects
put_params implementations, of which there are few.

NOTE THE NON-BACKWARD-COMPATIBLE CHANGE IN THE gx_device STRUCTURE UNDER
'Documentation' ABOVE.  (gdevescp.c, gdevsj48.c, gdevsppr.c, gdevxini.c)

Platforms
---------

Ensures that the Unix makefiles all include all the variants of TIFF/F and
fax drivers.  (ansihead.mak, cc-head.mak, gcc-head.mak)

Interpreter
-----------

Fixes bugs:
	- Most of the contents of statusdict were missing when
running a Level 2 system in Level 1 mode.  (zmisc2.c)

Version 3.1 (9/20/94)
===========

This release finally includes a usable subset implementation of
setpagedevice, including all the machinery needed to address the
long-standing "margins" problems.

Documentation
-------------

Fixes bugs:
	- t_oparray objects weren't identified as behaving differently
depending on whether they were marked executable.  (iref.h)
	- drivers.doc had gx_color_value instead of gx_color_index in
the description of color mapping.  (drivers.doc)

Updates drivers.doc to reflect the change from static_procs to
std_procs in the gx_device structure.  (drivers.doc)

Procedures
----------

Fixes bugs:
	- The commands for building the JPEG library used rm instead
of rm -f.  (jpeg.mak)

Drivers
-------

Fixes bugs:
	- The X Windows driver hadn't been updated to reflect some
name changes in members of the gx_color_info structure.  (gdevx.h,
gdevx.c, gdevxini.c)

Changes all non-printer drivers so that they use the new std_device_body
macros.  (gdev*.c)

Adds a print_page_copies procedure for printer drivers, allowing the
driver to receive num_copies.  (gdevprn.h, gdevprn.c)

Interpreter
-----------

Fixes bugs:
	- ref_memory_enum/reloc_ptrs were declared inconsistently.
(ialloc.c)
	- If the operand of restore was invalid, the restore did
nothing, instead of giving a typecheck.  (zvmem.c)
	- In Level 2, the margins and setmargins compatibility
operators were defined incorrectly in terms of current/setpagedevice.
(gs_lev2.ps)

Enables .makeoperator to make local operators as well as global ones.
(opdef.h, iinit.c, zmisc.c, zpacked.c)

Finishes implementing the TransferFunction entry in halftone
dictionaries.  (zht1.c, zht2.c)

Adds .set/currentfilladjust operators for access to the fill
adjustment parameter in the graphics state.  (zgstate.h)

Removes the deviceinitialmatrix operator.  (zdevice.c)

Changes defaultmatrix from a procedure to an operator.  (zmatrix.c)

Sets the fill adjustment to 0.5 for high-resolution devices, effectively
implementing Adobe's any-part-of-pixel filling rule.  (gs_init.ps)

Implements a small but useful subset of setpagedevice.  (gs_lev2.ps)

Streams
-------

Fixes bugs:
	- The eexec decoder incorrectly concluded that its data was
in hex form if the first data character was whitespace.  (seexec.c)

Library
-------

Fixes bugs:
	- Thin graphics (e.g., lines or rectangles) with small angles
relative to the X axis rendered with many points missing.  (gxdraw.c,
gxfill.c)
	- The character cache rejected oversampled characters if the
scaled-up size was too large, even if the scaled-down size wasn't.
(gxchar.h, gschar.c, gxccache.c, gxccman.c)
	- A call on sqrt with an integer argument didn't promote it
explicitly to double, which is required for non-ANSI compilers.
(gshtscr.c)

Finishes implementing the TransferFunction entry in halftone
dictionaries.  (gsht1.c)

Modifies the character oversampler so it can produce gray scale
output instead of a 1-bit mask.  We don't actually make use of this
ability yet.  (gxccman.c)

Adds gs_set/currentfilladjust for access to the fill adjustment
parameter in the graphics state.  (gsstate.h, gsstate.c)

Changes the names of the last few routines beginning with gz_ to
begin with gx_ instead.  (gzdraw.h => gxdraw.h, gsimage*.c, gxdraw.c,
gxfill.c, gxstroke.c)

Properly implements the PageSize, Margins, .HWMargins, and ImagingBBox
device parameters for all devices.  (gscoord.c, gsdparam.c, gspath2.c)
Implements the NumCopies device parameter for printer devices.
(gdevprn.c)

Implements std_device_body macros to help insulate statically initialized
non-printer devices from future changes in the gx_device structure.
(gxdevice.h, ... many .c files ...)

Version 3.0.3 (9/16/94)
=============

This is primarily a bug fix release; it also implements most of the
remaining Level 2 loose ends (except for setpagedevice).

Documentation
-------------

Changes code that refers to "Ghostscript" to use the correct product
name from gs_product.  (gs.mak, gdevpbm.c, gdevsun.c, gswppm.c)

Documents the new .forgetsave operator.  (language.doc)

Clarifies the distinction between commercial licensing and single-copy
end-user sales.  (readme)

Procedures
----------

Fixes bugs:
	- The compilation rule for gdevadmp.c was missing from the
makefile.  (devs.mak)

Changes the version numbering scheme back to A.B.C, since too many
people got confused by the change to A.BC.  (gconfig.c, gs.c,
gs_init.ps)

Adds a -dNOGC switch to prevent the garbage collector from being
enabled.  (gs_init.ps)

Utilities
---------

Removes the ps2image utility, since the new psmono driver replaces it.

Drivers
-------

Fixes bugs:
	- The TIFF drivers incorrectly assumed that short and ulong
were the same size as TIFF_short and TIFF_ulong, causing problems on
64-bit systems.  (gdevtfax.c)
	- The EGA/VGA driver didn't do gray halftones properly if it
was configured as a monochrome or 8-color device.  (gdevpcfb.h)
	- The comment in gdevevga.c incorrectly identified the file
as gdevpcfb.c.  (gdevevga.c)

Changes the PC display drivers to save and restore more of the BIOS
state.  (gdevpcfb.h, gdevevga.c, gdevpcfb.c, gdevsco.c)

Adds a new psmono driver that does the same thing as ps2image, faster
and more conveniently.  (gdevpsim.c)

Replaces the X11 driver with the one from 3.01, since the color
handling rewrite in 3.02 introduced serious bugs.  (gdevx.h, gdevx.c,
gdevxini.c)

Platforms
---------

Changes the definition of gx_no_color_index to work around one of the
bugs in the SGI Irix compiler.  (gxdcolor.h)

Rewrites the installation commands in unix-end.mak so they don't have
very long lines.  (unix-end.mak)

Fonts
-----

Fixes bugs:
	- Fonts that used 2- or 4-element arrays in the Metrics dictionary
interpreted the width and side bearing interchanged with each other.
(gs_type1.ps)
	- Setting FONTPATH on the command line didn't work.  (gs_fonts.ps)

Streams
-------

Fixes bugs:
	- The stream position wasn't updated properly if sgets
crossed a buffer boundary.  (stream.c)

Extends the BoundedHuffman filters so they can encode and decode runs of
zeros specially, and so they mark and detect EOD.  (sbhc.h, shc.h, sbhc.c,
zfilter2.c)

Provides an alternate implementation of file streams which doesn't use
stdio buffering and which works around the System V "interrupted system
call" problem.  (stream.c, sfile.c, sfileno.c)

Increases the maximum LZW output code from 3000 to 4095.  (slzwe.c)

Interpreter
-----------

Fixes bugs:
	- Opening a filter on a file of the wrong access type (read
vs. write) didn't cause an error.  (stream.h, sbasic.c, zfile.c, zfileio.c)
	- save performed an extra, unnecessary gsave.  (zvmem.c)
	- sethalftone always gave a /undefined error.  (zht2.c)
	- eexec decryption read too much data from the input -- in
Level 2, it isn't allowed to read 512 characters ahead.  (sfilter.h,
strimpl.h, seexec.c, sstring.c, zfileio.c, zmisc1.c)
	- The scanner was too aggressive about allocating additional
space for strings on small machines.  (iscan.c)
	- The AccurateScreens flag in Type 1 and Type 2 halftone
dictionaries was being ignored.  (zht2.c)
	- The Level 2 definition of margins in statusdict didn't
allow for Margins being undefined in the current page device.
(gs_lev2.ps)
	- The Interpolate flag was being ignored in image
dictionaries.  [implemented in library]
	- The TransferFunction option was being ignored in halftone
dictionaries.  (zht2.c)
	- Type 5 halftones usually didn't work, because they called
the wrong (or an invalid) spot function.  (zht2.c)

Implements a .forgetsave operator that effectively causes a given save (and
all more recent saves) to disappear.  (isave.h, stream.h, isave.c, zfile.c,
zvmem.c)

Library
-------

Fixes bugs:
	- In the 1-operand form of the image operator, a Decode value of [1
0] with 8-bit sample values and a single data source was treated the same
as [0 1].  (gsimage1.c)
	- Some Monotype fonts put a callsubr between an OtherSubr call and
the following 'pop' opcodes (which the Adobe documentation forbids); The
Type 1 font interpreter gave an invalidfont error rather than allowing
this.  (gxtype1.h, gstype1.c)
	- Patterns didn't implement XStep and YStep properly.
(gxpcolor.h, gspcolor.c, gxclip2.c)
	- Clipping regions were sometimes 1 pixel too small at the edges;
this could cause vertical and horizontal lines produced by certain Windows
drivers to disappear.  (gzpath.h, gxacpath.c, gxcpath.c, gxfill.c)
	- Oversampling cached rotated characters produced very bad
results (many dropouts).  (gschar.c)
	- Rendering a DeviceGray color on a DeviceCMYK device applied
the transfer function to all 4 components, not just to the K
component.  (gxcmap.c)
	- A screen specified with setcolorscreen didn't take effect
properly on CMYK devices.  (gsht.c)

Implements the Interpolate option for images.  Currently this is only
implemented for portrait-orientation images (no rotation, skewing, or
X-reflection).  (gscspace.h, gximage.h, gscie.c, gscolor.c, gscolor1.c,
gscolor2.c, gspcolor.c, gxcmap.c, gsimage.c, gsimage2.c, gsimage3.c)

Implements AccurateScreens, but only in the form of a larger limit on
the size of a halftone super-cell.  (gxht.h, gsht.c, gsht1.c)

Starts to implement the TransferFunction option for halftones.
(gzht.h, gzstate.h, gsht.c, ...too many others to list...)

Version 3.02 (8/30/94)
============

This is another bug fix release.  It was distributed only to a few people,
since the new X Windows color mapping code is not reliable yet.

Documentation
-------------

Fixes bugs:
	- make.doc, but not unixtail.mak, called for setting PLATFORM=unix_
on SVR4 platforms.  (unixtail.mak)
	- drivers.doc contained some wording that suggested that
Ghostscript always used RGB colors internally.  (drivers.doc)
	- The definition of gx_device in drivers.doc had gotten out of sync
with gxdevice.h.  (drivers.doc)
	- README claimed that Ghostscript is not compatible with the
VAX/VMS DEC C compiler, which is no longer true.  (readme)

Adds a new section on printer drivers to drivers.doc.  (drivers.doc)

Adds a large number of new display boards to the 800x600 SVGA section of
use.doc.  (use.doc)

Adds a bug report form to the README file.  (readme)

Notes that OSF/1 AXP systems require changing the definition of INSTALL
from install to installbsd.  (make.doc)

Procedures
----------

Removes -Wno-uninitialized from the gcc flags, and fixes all the places (in
Aladdin's code only) that need to be fixed to pacify gcc after doing this.
(gcc-head.mak, gdevgif.c, gdevmem2.c, gdevpcl.c, gs.c, gsht1.c, gsimpath.c,
gsutil.c, gxclread.c, gxpcopy.c, gxstroke.c, idict.c, iscannum.c, stream.c,
zdevice2.c) (NOT FINISHED YET)

Adds a FAKEFONTS switch that makes fake entries in FontDirectory for
unloaded fonts, for the benefit of programs that think they can find all
the available fonts by scanning FontDirectory.  (gs_fonts.ps, gs_init.ps)

Utilities
---------

Fixes bugs:
	- ps2epsi didn't work, because setdevice now erases the page.
(ps2epsi.ps)
	- ps2epsi didn't work, because -dNODISPLAY installs a null device
with 0 width and height.  The fix -- to remove the -dNODISPLAY -- is not
satisfactory, because it opens an unnecessary window.  (ps2epsi)

Drivers
-------

Fixes bugs:
	- gdev_fax_open was incorrectly declared static in gdevtfax.c,
causing the extern reference in the dfax drivers not to be resolved.
(gdevtfax.c)
	- devs.mak included a duplicate definition of gdevmswn_h.
(devs.mak)
	- The fax drivers didn't link properly in Level 1 systems, because
shc.c was omitted from their dependency list.  (gs.mak, devs.mak)
	- The TIFF/F drivers didn't set RowsPerStrip properly.
(gdevtfax.c)
	- The TIFF/F drivers didn't byte-align the EOL properly.  (scfx.h,
gdevdfax.c, gdevtfax.c, scfe.c, zfilter2.c)
	- The rule for compiling gdevpccm.c incorrectly specified
dependency on gs.h rather than gx.h.  (devs.mak)
	- The rule for compiling gdevtfax.c didn't include time_.h as a
dependency.  (devs.mak)
	- The mode 2 compression routine for the DeskJet/LaserJet printers
was broken.  (gdevpcl.c)

Removes the -O0 from the compilation rule for gdevsco.c, since it was
misplaced to begin with.  (devs.mak)

Adds a maxDynamicColors X resource to control dynamic allocation in the
color map.  Replaces the X color lookup algorithms with completely new
ones, for a substantial performance gain.  (gdevx.h, gdevx.c, gdevxini.c)

Adds PageNumber, Software, and DateTime entries to the TIFF/F drivers.
(gdevtifs.h, gdevtfax.c)

Changes the margins for the LaserJet 4 to 0.  (gdevdjet.c)

Adds a user-contributed LaserJet 4 driver that does Floyd-Steinberg
dithering.  (gdevcdj.c)

Platforms
---------

Fixes bugs:
	- The exit codes for Ghostscript should be different on VMS.
(iastate.h, gs.c, gsmain.c, igc.c, igcref.c)
	- The VMS DEC C compiler declares malloc and free in stdlib.h, and
delete and unlink in stdlib.h.  (malloc_.h, stdio_.h)
	- st_prn_device wasn't defined, which upset the VMS linker even
though there were no references.  (gdevprn.h)
	- stdpre.h didn't bring in the right headers when running gcc on
SCO Unix, causing compilation warnings/errors.  (stdpre.h)
	- The definition of rename in gp_sysv didn't include const for the
arguments.  (gp_sysv.c)
	- The definition of gettimeofday in gp_sysv didn't return any
value.  (gp_sysv.c)
	- time_.h didn't work on MS-DOS systems.  (time_.h)
	- math_.h didn't include <math.h> when compiling with gcc on VMS
systems.  (math_.h)
	- DesqView/X doesn't have a 'cat' command, which caused problems in
the linking step.  (dvx-tail.mak)

Changes the definitions of popen in gdevpipe.c and gp_unix.c so they don't
specify the argument list.  This is an attempt to get around the fact that
there is no easy way to detect whether the available header files declare
popen correctly (with const arguments), incorrectly (with non-const
arguments), or not at all.  (gdevpipe.c, gp_unix.c)

Replaces VMS.MAK, VMS-CC.MAK, and VMS-AXP.MAK with new versions provided by
a user.  (vms.mak, vms-cc.mak, vms-axp.mak)

Changes the 16-bit Borland makefiles so their standard configuration is
Level 1 plus color.dev (CMYK color and colorimage).  (bc.mak, bcwin.mak)

Fonts
-----

Fixes bugs:
	- cfonts.mak still referred to some .gsf files that have been
replaced by .pfa files.  (cfonts.mak)
	- Compiled fonts got entered into FontDirectory, but didn't get
registered as resources.  (gs_ccfnt.ps)
	- The Cyrillic, Kana, Hershey .gsf, and URW fonts didn't include a
necessary systemdict begin/end, which caused them to fail in badly designed
environments.  (fonts/f*.gsf, fonts/h*.gsf, fonts/?0*.gsf)

Changes the default target directory in cfonts.mak from fonts/c to .;
changes the names of the Zapf Chancery compiled font procedures from c* to
zc*.  (cfonts.mak)

Adds more fonts from the Adobe Type Manager package for MS Windows to
Fontmap.ATM.  (fontmap.atm)

Adds the entire set of 35 standard fonts to the ccfonts feature in gs.mak;
removes all the compilation rules for compiled fonts, since these rules are
in cfonts.mak already.  (gs.mak)

Interpreter
-----------

Fixes bugs:
	- kshow executed a null, rather than the correct procedure, between
the characters of the string, and got a typecheck error at the end.
(zchar.c)
	- MultiMaster fonts computed their side bearing and width
incorrectly, producing incorrect output.  (zchar1.c)
	- There was no structure definition for gs_type1_state, so a GC
during the execution of an OtherSubrs procedure could scramble pointers in
the saved state.  (zchar1.c, zfont1.c; also affects library, see below)
	- kshow didn't work properly if the kerning procedure changed the
depth of the operand or dictionary stack.  (zchar.c)
	- If the element count for roll was too large by only 1 or 2, the
result was a crash rather than a rangecheck.  (zstack.c)
	- restore didn't undo currentgstate.  (igstate.h, store.h,
gsstate.c, zdevice2.c, zdps1.c, ztype.c)
	- The scanner didn't set the local bit properly in a suspended
state.  (iscan.c)
	- copypage disregarded #copies.  (gs_init.ps)
	- An incorrectly declared pointer led to addressing faults on
16-bit systems.  (zchar1.c)
	- The cache for Separation colors was allocated with one element
too few.  (zcsindex.c)

Changes `executive' so that if an error other than EOF occurs in the
reading of the statement, the interpreter prints the error message, but
control remains in the executive loop.  (This isn't a very good fix; a
better one will require refactoring executive / execute / run.)
(gs_init.ps)

Changes dictionary undo saving to use the new ref_must_save macro [internal
change only].  (idict.c)

Moves configuration definitions from iinit.c to gconfig.c.  (gcdefs.h,
interp.h, gconfig.c, gs.c, iinit.c, zmisc2.c, gs.mak)

Moves =string from systemdict to userdict for Adobe compatibility.
(gs_init.ps)

Starts to implement the Interpolate flag in image dictionaries.  See under
Library below for restrictions.  (zpaint.c, zimage2.c)

Streams
-------

Fixes bugs:
	- stream_compact attempted to compact a read-only string being used
as the data source of a filter.  (sbasic.c, stream.c)

Adds an EncodedEOLAlign flag to the CCITTFaxEncode stream, to allow direct
generation of TIFF/F output.  (scfx.h, scfe.c, zfilter2.c)

Library
-------

Fixes bugs:
	- There was no structure definition for gs_type1_state, so a GC
during the execution of an OtherSubrs procedure could scramble pointers in
the saved state.  (gxfont1.h, gxtype1.h, gstype1.c, gxhint2.c)
	- A couple of calls had to discard const, but didn't include the
necessary cast.  (gxpcmap.c)
	- makeimagedevice refused to accept an empty image.  (gsdevice.c)
	- The extra parentheses around arguments in memory_.h caused some
compilers to fail.  (memory_.h)
	- Floating point overflows during coordinate conversion terminated
Ghostscript.  (gxfarith.h, gxfixed.h, gsmatrix.c, gsmisc.c)
	- Accents still weren't getting placed properly on characters
created with seac.  (gstype1.c, gxhint2.c)
	- The SGI C compiler couldn't handle the (perfectly legal)
definitions of dev_init_[open_]misc.  (gxdevice.h)
	- string_.h caused some problems with gcc on some versions of
Solaris.  (string_.h)
	- The halftone levels for color screens were computed incorrectly.
(gzht.h, gxdither.c)
	- Color screens sometimes had vertical stripes of solid color
interspersed.  (gxcht.c)
	- Colors could get mapped incorrectly if a compiler aggressively
(and incorrectly) reordered the computation of procedure arguments
involving the unit_frac macro.  (gxcmap.c)
	- setcachedevice[2] insisted that the corners of the bounding box
be given in the correct order, i.e., llx < urx and lly < ury.  (gschar.c)
	- The image operator gave a limitcheck on unrotated 1-bit-per-pixel
images whose width in device coordinates exceeded 65529.  (gsimage.c)
	- The garbage collector didn't trace the input data of an
in-progress image operator correctly.  (gsimage.c)

Changes the max_rgb and dither_rgb members of gx_device_color_info to
max_color and dither_colors, since Ghostscript now uses these for CMYK
devices as well.  Also changes dither_gray to dither_grays.  (gdevmem.h,
gdevprn.h, gxdevice.h, gdevbit.c, gdevcdj.c, gdevprn.c, gdevxini.c,
gsdparam.c, gxcht.c, gxcmap.c)

Starts to implement the Interpolate option for images.  Currently this is
only implemented for image, not imagemask, and only for rotations that are
multiples of 90 degrees (possibly with reflection).  (gsimage.h,
gsiscale.h, gximage.h, gsimage.c, gsimage1.c, gsiscale.c)

Starts to implement XStep and YStep in pattern dictionaries.  (gxdcolor.h,
gxpcolor.h, gspcolor.c, gxpcmap.c)

Version 3.01 (8/14/94)
============

This is a patch release to fix early problems in release 3.0, and to clean
up a few known loose ends.

Documentation
-------------

Fixes bugs:
	- language.doc still documented the devicename procedure, which has
been withdrawn.  (language.doc)
	- drivers.doc didn't specify under what circumstances each
procedure could be called.  (drivers.doc)
	- current.doc said that setcachedevice and makeimagedevice wouldn't
accept packed arrays, but neither of these operators takes any array
arguments.  (current.doc)
	- current.doc said that definefont didn't interact properly with
the resource machinery, which apparently is no longer true.  (current.doc)
	- make.doc incorrectly gave the name of the DVX makefile as
dvx-djg.mak rather than dvx-gcc.mak.  (make.doc)
	- In one place, devices.doc incorrectly used -sBitsPerPixel= rather
than -dBitsPerPixel=.  (devices.doc)

Notes that a kernel bug in SCO Unix makes Ghostscript not work correctly in
some circumstances.  (use.doc)

Procedures
----------

Fixes bugs:
	- devs.mak incorrectly referred to gdevjetp.c instead of
gdev3852.c.  (devs.mak)
	- The obsolete file gsprops.c was accidentally included in the
fileset.

Changes the version numbering scheme from A.BCC to A.B[C].  E.g., this
release will be 3.01, not 3.001.  (gs_init.ps, gs.c, iinit.c)

Adds the LaserJet 4 driver to all makefiles that already include the
LaserJet 3 driver.  (*.mak)

Adds the BJ-200 driver to all makefiles that already included the BJ-10e
driver.  (*.mak)

Splits the Unix 'install' target into install-exec and install-data.  Moves
the executable scripts from gsdatadir to a new directory scriptdir, which
defaults to bindir.  (ansihead.mak, cc-head.mak, gcc-head.mak,
unix-end.mak)

Utilities
---------

Fixes bugs:
	- genconf had fixed buffer sizes built into it, which it could
overrun its working storage without checking.  (genconf.c)

Removes RCS or SCCS headers from two utility files.  (pj-gs.sh,
printafm.ps)

Drivers
-------

Fixes bugs:
	- The new dfaxhigh and dfaxlow drivers didn't set
state.EncodedByteAlign to false.  (gdevdfax.c)
	- The sunview driver assumed that the device would be open before
map_rgb_color was called.  (gdevsun.c)
	- The CP50 driver incremented page_count itself, rather than
letting the core library do it.  (gdevcp50.c)
	- The GIF driver(s) could loop indefinitely under certain
circumstances.  (gdevgif.c)
	- The Group 4 fax drivers incorrectly included end-of-line codes in
the output.  (gdevtfax.c, gdevdfax.c)
	- The Group 4 fax drivers could put out an EOB in the middle of the
data.  (scfe.c)
	- The DesignJet 650C driver didn't use the correct compression
mode.  (gdevcdj.c)
	- The Hercules and EGA/VGA/SVGA drivers computed the page height
incorrectly according to the A4 switch.  (gdevherc.c, gdevpcfb.h)

Changes the page_count and showpage_count members of the device structure
from int to long.  (gxdevice.h, gdevprn.c, gsdparam.c)

Changes the faxg3, faxg32d, and faxg4 drivers so that, like the TIFF and
dfax drivers, they adjust the page size to one of the three CCITT standard
sizes if this is reasonable.  (gdevtfax.c)

Splits the bit driver into bit, bitrgb, and bitcmyk.  Adds bitrgb and
bitcmyk to all makefiles that included bit.  (*.mak, devs.mak, gdevbit.c)

Replaces the atiw16, tseng16, and tvga16 SuperVGA drivers with a single
svga16 driver that allows specifying the display mode number.  (devs.mak,
gdevpcfb.c)

Platforms
---------

Fixes bugs:
	- The MS Windows and OS/2 drivers allocated their terminal input
buffers in a way that could cause the GC to crash.  (gp_mswin.c, gp_os2.c)
	- The handling of gettimeofday on SVR4 platforms was incorrect.
(time_.h, gp_sysv.c, gp_unix.c)
	- On some platforms, function prototypes were not enabled even if
__STDC__ was defined.  (stdpre.h)
	- The VMS build script referred to an obsolete feature lev2only.
(vms.mak)

Changes the DVX platform so that stdprn is buffered.  This should improve
printing performance dramatically.  (gp_dvx.c)

Fonts
-----

Fixes bugs:
	- Setting DISKFONTS resulted in a reference to FontFileDirectory
before it was defined.  (gs_type1.ps, gs_fonts.ps)
	- /Font findresource gave an error rather than doing font
substitution.  (gs_res.ps)
	- FontDirectory wasn't rebound to GlobalFontDirectory when global
VM was current.  (gs_res.ps, zdict.c)
	- Type 1 fonts weren't loaded into global VM.  (gs_fonts.ps)
	- In the standard Fontmap, the Utopia fonts had extension .gsf
rather than .pfa.  (fontmap.gs)
	- Fonts whose FontBBox was [0 0 0 0] were not displayed, or were
displayed as tiny dots.  (gs_type1.ps)

Interpreter
-----------

Fixes bugs:
	- dict_put could read from the variable pvslot before it was used.
(This was harmless, since the value was never actually used; it just upset
Purify.)  (idict.c)
	- Binary object sequences could cause addressing faults.
(iscanbin.c)
	- The attributes on names were set incorrectly in binary object
sequences.  (iscanbin.c)
	- gs.c duplicated (in some cases incorrectly) some definitions in
interp.h.  (gs.c)
	- gs_lib_paths was declared const in one place and non-const in
another.  (zfile.c)
	- file_restore and font_restore had inconsistent const declarations
for their argument.  (isave.c)
	- iodev_os_open_file was missing its last formal parameter.
(ziodev.c)
	- gs.c declared gs_devicename with an incorrect extern.  (gs.c)
	- undefinefont didn't interact properly with the resource
machinery.  (gs_lev2.ps)
	- The declaration for swap_entry used a typedef name as a formal
parameter, which upset some compilers.  (zmisc2.c)
	- Including the ccinit feature could cause the garbage collector to
make an invalid access.  (stream.c)
	- The check for t_[a]struct types in ztype.c was incorrect.
(ztype.c)
	- After the collection of halftone samples, temporary data
structures were freed incorrectly.  (gzht.h, gsht1.c, zht.c)
	- Images with source width between 489 and 492 crashed the
memory manager.  (iastate.h)

Makes it possible to define SEARCH_HERE_FIRST (gsmain.c) in the makefile.
(gsmain.c)

Splits the Level 2 resource machinery into a separate file.  (gs_lev2.ps,
gs_res.ps, gs.mak, unix-end.mak, vms.mak).

Changes the names of the DiffEncode/Decode filters to
PixelDifferenceEncode/Decode, and splits them off into a separate
"feature".  (gs.mak, zfilter2.c, zfpdiff.c, spdiff.c, spdiffx.h)

Adds experimental code for filtered image scaling.  DON'T USE THIS CODE.
(zimage2.c)

Streams
-------

Fixes bugs:
	- The CCITTFaxEncode filter could put out an EOB in the middle of
the data.  (scfe.c)

Splits off the PixelDifferenceEncode/Decode filters into a separate
"feature".  (gs.mak)

Library
-------

Fixes bugs:
	- gs_setcachedevice could return a garbage error code.  (gschar.c)
	- joins on stroked lines were incorrect if the device coordinate
system mapped +Y to +Y.  (gxstroke.c)
	- If gsmisc.c supplied versions of missing library routines, they
could clash with the names of the real ones if those were present
unexpectedly.  (memory_.h, gsmisc.c)
	- The initialization expression for is_open in the
dev_init_misc_open macro included a cast, which some compilers don't allow.
(gxdevice.h, gsdevice.c, gxclip2.c, gxpcmap.c)
	- In Type 1 fonts, character that specified their side bearing and
width with sbw rather than hsbw gave an invalidfont error.  (gstype1.c)
	- Some procedures were declared inconsistently with regard to const
arguments.  (gscie.c, gxpcmap.c, gxacpath.c, gxcmap.c)
	- A few places still assumed that pointers occupied 4 bytes.
(gxclist.c)
	- Rendering a gray halftone on a CMYK device called the device's
map_rgb_color procedure instead of map_cmyk_color.  (gxdither.c)

Renames gsfile.c as gswppm.c.  (gsfile.c, gswppm.c)

Implements the ability to cache arbitrarily transformed characters.  This
is currently enabled by a compile-time flag in gschar.c.  (gschar.c)

Version 3.0 (8/1/94)
===========

This is the first full Level 2 version released to the public.
Unfortunately, we were not able to include setpagedevice in this release.

Documentation
-------------

Fixes bugs:
	- README didn't mention Aladdin's European distributor.
	- psfiles.doc didn't describe some of the newer gs_*.ps files.

Notes that gcc -O2 (version 2.5.8 of gcc) generates incorrect code for some
modules on the H-P RISC architecture.

Notes that on AXP platforms running VMS, DEC C V4.0 is required.

Procedures
----------

Fixes bugs:
	- 'make clean' didn't delete devs.tr or t.tr.
	- devs.mak was missing the entry for faxg32d.
	- unixansi.mak omitted some drivers that were included in
unix-cc.mak and unix-gcc.mak.

Updates jpeg.mak to reference version 5beta1 of the IJG JPEG code.

Changes the version numbering scheme from A.B.C to A.B[CC].  I.e., the
first sub-release after 3.0 will be 3.01 or 3.001, not 3.0.1.

Utilities
---------

Fixes bugs:
	- ps2ascii didn't do a setglobal.

Adds an option to ansi2knr to convert ... to va_alist/va_dcl.

Drivers
-------

Fixes bugs:
	- The newly added faxg32d driver didn't have an entry in devs.mak.
	- The BMP, GIF, and PCX drivers wrote out an incorrect color
palette (the blue values were too small).
	- The vgalib driver had some compilation problems.
	- The TIFF drivers didn't produce correct multi-page output.

Adds faxg32d and tiffg32d drivers.

Reinstates the DigiFax drivers, which were withdrawn when the new fax
drivers were added.

Platforms
---------

Fixes bugs:
	- gs_btokn.ps and gs_ccfnt.ps weren't installed on Unix platforms.
	- The VMS module list omitted SBHC, included a non-existent GXDASH,
and had incorrect names for some of the IJG JPEG files.
	- The VMS build scripts (vms*.mak) had incorrect "boilerplate".
	- The VMS script file gssetmod.com had \r characters in it, as well
as \n characters.
	- The echogs and genarch utilities didn't return the correct exit
codes under VMS.
	- The VMS Fontmap had incorrect entries for the Courier and Charter
fonts.
	- When running under Ghostview, Ghostscript didn't drain the input
pipe.  (We fixed this with a temporary patch in gs.c; this isn't a good
solution for the longer term.)

Fonts
-----

Fixes bugs:
	- The free AvantGarde, Bookman, and Palatino font families had
incorrect FontBBox values.
	- The 'f' and 'j' in the free AvantGarde-DemiOblique,
Bookman-DemiItalic, Bookman-LightItalic, and Palatino-Italic fonts were
chopped off on the right.  (The bitmaps were chopped off in the original
BDF fonts from which these fonts were made.)  ****** THIS PROBLEM WAS NOT
ACTUALLY FIXED. ******

Interpreter
-----------

Fixes bugs:
	- gs -h and gs -v didn't print the tertiary version number correctly.
	- Binary object sequences with no strings or names didn't read in
correctly.
	- Binary object sequences that crossed an input buffer boundary
didn't read in correctly.
	- Binary object sequences read in as {[e1 .. en] e1 ... en} instead
of {[e1 ... en]}.  (New bug in 2.9.x.)
	- setpattern didn't set the current color space correctly if the
current color space wasn't a Pattern space.
	- If the current color space was an uncolored Pattern space but the
current color was a colored Pattern, currentcolor returned extra values on
the operands stack.
	- .buildfont1 in gs_type1.ps didn't force binding of the old
definition, causing ps2ascii to loop endlessly.

Adds a facility for writing and reading dictionaries in binary object
sequences.  This is experimental and subject to change in the future.

Streams
-------

Fixes bugs:
	- gs_run_string and ccinit didn't have any way to mark the string
as "foreign", which confused the GC.

Library
-------

Fixes bugs:
	- gxchar.h had an extra comma after the last element of the
show_width_status enum, which upset some compilers.
	- stroke and strokepath didn't correctly skip zero-length segments
if the line width was less than one pixel, or if there was a closed subpath
consisting entirely of zero-length segments.
	- strokepath sometimes incorrectly added a moveto at the end of the
path.

Versions before 3.0
===================

See the files history2.txt and history1.txt.
