news

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   Copyright (C) 1989, 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.

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This file, NEWS, describes the changes in the most recent releases of
Ghostscript.  Changes in older releases are described in history*.txt.

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

Within each release, news appears in the following order: Documentation,
Procedures, Utilities, Drivers, Platforms, Fonts, Interpreter, Streams
(included under Interpreter through release 2.9.9), Library.  Changes
marked with a * were made available as patches to a previous release.

Version 4.03 (9/23/96)
============

This was an emergency re-release of 4.02 to fix the stdin redirection
problem.  It has essentially no other changes.

Known problems:
	- ps2pdf sometimes produces output with missing links.
	- ps2pdf can produce files with incorrect word spacing.
(k/offis/page12.*)
	- ps2pdf can produce files where text disappears after a figure, or
where a figure overlays text.  (k/offis/page10.*)
	- pdf2ps can produce output where what should be a small figure
overlays the text.  (k/pdf/ppi_10_d.*)
	- Setting HWSize by itself with setpagedevice has no effect.
	- When shrinking oversize halftone cells, the current algorithm,
which progressively halves the size, can produce non-monotonic behavior; GS
should either use a monotonic algorithm or give a limitcheck.
(k/jdscreen.ps)
	- In Type 1 fonts, almost-vertical lines that straddle a stem edge
produce uneven output.  Also, at some resolutions, stem hints produce
anomalous or clipped output, or even missing lines.  (k/pdf/pdfspec.pdf at
96 dpi)
	- If a character in a Type 3 font is defined by executing 'show'
type commands, charpath does the wrong thing (doesn't pick up the paths
created by the inner show).
	- Banded high-level images are disabled, because there is no way yet
to pass the color rendering information through the band list.
(USE_HL_IMAGES in gxclimag.c)
	- The computations for halftone cells don't work for non-square
pixels.  (gshtscr.c)

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

Fixes bugs:
	- Solaris 2.x has /usr/ucb/install, not installbsd.  (make.txt)

Updates current.txt to mention the ability to share libpng and libgz.
(current.txt)

Procedures
----------

Fixes bugs:
	- A rule assumed that the makefile was named `makefile'.
(unixtail.mak)

Drivers
-------

Fixes bugs:
	- The stcolor drivers had an off-by-1 error that could cause them to
write into unallocated memory.  (gdevstc.c)
	- The Imagen driver wouldn't compile with gcc.  (gdevimgn.c)

Fonts
-----

Fixes bugs:
	- The Solaris fontmap had gotten out of date.  (Fontmap.Sol)

Streams
-------

Fixes bugs:
	- The test for stdin being non-seekable could leave the file error
flag set, which caused an infinite loop when trying to read from the file
later.  (sfile.c, sfileno.c)

Version 4.02 (9/19/96)
============

This release fixes a few more bugs, and adds the ability to read encrypted
PDF files and some PDF 1.2 files.

This release was withdrawn after a few days because the stdin redirection
fix, which was made at the last minute, cause Ghostview to hang.

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

Fixes bugs:
	- The list of required support files was incorrect.  (install.txt)
	- The descriptions of file name lookup weren't accurate.  (use.txt)
	- A J should have been an H.  (gxbitmap.h)

Updates the documentation about encrypted PDF files.  (new-user.txt)

Documents what the 13 base PDF fonts are.  (ps2pdf.txt)

Fixes a tiny typo.  (c-style.txt)

Adds a user-contributed man page for the new pdf2dsc script.  (pdf2dsc.1)

Updates the government restricted rights notice in the Aladdin Ghostscript
Free Public License.  (PUBLIC)

Adds the URL of test files to the bug report form.  (new-user.txt)

Puts the bug reporting form in a separate file.  (readme, bug-form.txt,
new-user.txt)

Notes that map_xxx_color procedures should not return gx_no_color_index.
(drivers.txt)

Notes that Ghostscript supports the Flate filters.  (language.txt)

Documents the use of the system libpng and zlib.  (make.txt, gs.mak)

Notes that Borland C++ 5.0 and 5.01 will not compile Ghostscript correctly.
(make.txt)

Procedures
----------

Fixes bugs:
	- Using both DELAYBIND and SAFER caused problems.  (pstotext uses
DELAYBIND.)  (gs_init.ps)

Utilities
---------

Fixes bugs:
	- Some pdf2ps machinery interfered with the PDF interpreter.
(pdf_2ps.ps, pdf_main.ps)
	- In the output of pdf2ps, page numbers in link destinations were
too high by 1.  (pdf_main.ps)
	- viewpbm didn't handle value ranges other than [0..255] correctly.
(viewpbm.ps)

Adds a user-contributed shell script to invoke pdf2dsc.ps.  (pdf2dsc,
unix-end.mak)

Adds a switch to the genconf utility to set the prefix for generated
procedure names.  (genconf.c)

Adds the option of using system libraries (possibly shared) for libpng
and/or zlib.  (*head.mak, msc*.mak, os2.mak, tccommon.mak, wccommon.mak;
libpng.mak, zlib.mak)

Drivers
-------

Fixes bugs:
	- The X11 display devices ignored the -DA4 compile-time option.
(gdevx.c)
	- The garbage collector could scramble the state of the CGM drivers.
(gxdevice.h, gdevcgm.c)
	- An identifier of more than 31 characters upset the VAX DEC C
compiler.  (gdevcgml.h, gdevcgml.c)
	- In case of an error in trying to set the CoreDistVersion distiller
parameter, a variable could be used without initialization.  (gdevpdfp.c)
	- When DEBUG is selected, the X Windows driver referenced _Xdebug,
which is not defined in (at least the VMS version of) DECWindows.  (x_.h,
gdevxini.c)
	- Some map_cmyk_color implementations could return "transparent".
(gdevbit.c)
	- Setting GraphicsAlphaBits or TextAlphaBits in the P*M drivers
caused an error.  (gdevpbm.c)
	- If a user cancelled printing under MS Windows, a confusing error
resulted, and a temporary file wasn't deleted.  (gdevwpr2.c)
	- The map_color_rgb procedure for the bit devices produced incorrect
results.  (This probably had no effect in practice.)  (gdevbit.c)
	- The os2prn device produced incorrect output.  (gdevos2p.c)
	- The OS/2 PM device didn't detect PM applications correctly.
(gdevpm.c)
	- The MS Windows printer driver didn't automatically detect the
printer's color capabilities.  (gdevwpr2.c)
	- The BJC-610 driver didn't print at 720 dpi.  (gdevcdj.c)
	- The static prototypes of many devices didn't include the far_data
keyword.  (gdev3852.c, gdev4081.c, gdevbgi.c, gdevcgm.c, gdevht.c,
gdevimgn.c, gdevl256.c, gdevmrop.c, gdevn533.c, gdevnfwd.c, gdevnp6.c,
gdevo182.c, gdevpcfb.c, gdevpdf.c, gdevpe.c, gdevpm.c, gdevs3ga.c,
gdevsnfb.c, gdevsppr.c, gdevsun.c, gdevsvga.c, gdevtknk.c, gdevvglb.c,
gdevwddb.c, gdevwprn.c, gdevx.c, gdevxalt.c)
	- The (original) deskjet driver collapsed print lines towards the
left margin.  (gdevdjet.c)

Adds to the pgm/pgnm/ppm/pnm[raw] drivers the ability to set the maximum
pixel value, by setting any of the Gray/Red/Green/BlueValues device
parameters.  (gdevpbm.c)

Adds pkm[raw] drivers, which do all their internal computations in CMYK and
convert the data to RGB as they write the file.  (gdevpbm.c)

Platforms
---------

Fixes bugs:
	- The VMS script referred to old versions of the third-party
libraries.  (vms.mak)
	- Under VMS with DEC C, attempting to open a new file fails.
(gp_vms.c)
	- If you tried to print (gp_printfile) under Windows on a system
with no printers installed, Ghostscript caused a GPF.  (gp_mswin.c)

Restores support for a non-DLL MS Windows platform.  (bcwin32.mak,
dwnodll.cpp)

Adds a new MS Windows DLL call, gsdll_get_bitmap.  (gsdll16.def,
gsdll32.def, dll.txt, gdevwdib.c)

Fixes a variety of other small Windows- and OS/2-related problems, mostly
related to printing.  (gp_mswin.h, dpmainc.c, dwmain.cpp, dwmainc.cpp,
gdevmswn.c, gdevpm.c, gdevwpr2.c, gp_mswin.c)

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

Fixes bugs:
	- The value of /newerror in $error was true at the end of
initialization.  We now reset it after each internal use of stopped if
necessary.  (gs_dps1.ps, gs_fform.ps, gs_fonts.ps, gs_init.ps, gs_pdf.ps,
gs_res.ps, gs_type1.ps)
	- setpagedevice (and finddevice) didn't recognize Default.
(gs_init.ps)
	- When running with -dNODISPLAY, calling gssetresolution would cause
a crash.  (gs_init.ps)
	- A particular combination of save, .forgetsave, and garbage
collection could cause a memory access error in restore.  (isave.c)
	- Some references to systemdict were affected if a user redefined
the name /systemdict.  (gs_cmdl.ps, gs_fonts.ps, gs_kanji.ps, gs_dps1.ps,
gs_init.ps, gs_res.ps, gs_statd.ps, gs_type1.ps)
	- The insideness testing operators caused an invalid memory access.
(drivers.txt, zupath.c)
	- If a readline reached an input buffer boundary between the \r and
\n of a 2-character EOL, an error could occur.  (zfileio.c)
	- setdevparams caused an error.  (gs_lev2.ps)

Changes file names beginning with ./ or ../ so they are recognized as
"absolute" and not subject to the search path.  (gp_dosfs.c, gp_ntfs.c,
gp_os2.c, gp_unifn.c)

Changes the exit code for -h or --help from 0 to 1, so an invoking program
will keep the output around for the user to look at.  (imainarg.c)

Adds the FlateEncode and FlateDecode filters; adds PNG pixel prediction to
the LZW filters.  These additions are required for PDF 1.2 and will be part
of PostScript Level 3.  (int.mak, lib.mak, zfdecode.c, zfilter2.c, zfzlib.c,
zfpngp.c [deleted])

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

Fixes bugs:
	- The copyright notices on some files didn't mention the Aladdin
free license.  (pdf_*.ps)
	- Some references to systemdict were affected if a user redefined
the name /systemdict.  (pdf_font.ps)
	- The value of /newerror in $error was true at the end of
initialization.  We now reset it after each internal use of stopped if
necessary.  (pdf_main.ps)
	- stdin redirection failed for PDF files even if the new stdin was
seekable.  (pdf_main.ps)
	- The Rotate key rotated pages in the wrong direction.
(pdf_main.ps)

Adds a minimal "security socket" to the interpreter.  This does not include
any actual decryption code; such code is available elsewhere (see
new-user.txt).  (int.mak, pdf_base.ps, pdf_main.ps, pdf_sec.ps)

Adds a PDF 1.2 capability:
	- The destination in a Dest array can be a page number as well as a
page object.  (pdf_main.ps)

Streams
-------

Fixes bugs:
	- stdin was assumed to be non-seekable.  (sfile.c, sfileno.c)

Library
-------

Fixes bugs:
	- Garbage collection could corrupt a pointer in Type 0 fonts.
(gxfont0.h, gsfont0.c)
	- When applying hints to a Type 1 font outline, the last point could
sometimes get moved twice, causing output anomalies.  (gxhint3.c)
	- An #include needed for debugging was missing.  (gxcmap.h)
	- Graphics states included a no-longer-used private color space
object.  (gsstate.c)
	- Images could get clipped randomly in the X direction.  (I don't
understand why this problem hasn't shown up more often, since it's been
there since release 4.00.)  (gximage.c)
	- The arct and arcto operators failed to draw the line to the
starting point of the arc.  (bug introduced in 4.01) (gspath1.c)
	- Prefix subclasses of simple structures caused an invalid memory
access.  (gsstruct.h)
	- The variable fheight was sometimes unused.  (gstype1.c)
	- igcd and imod didn't have prototypes in an appropriate header
file, and were declared extern in several places.  (gsdcolor.h, gsline.h,
gxarith.h, gxdht.h, gsht.c, gshtscr.c, gsimage.c, gsline.c, gstype1.c,
gxclimag.c)
	- When using a non-identity RenderTable in a CIE rendering
dictionary, all colors came out too light.  (gscie.c)
	- When using anti-aliased graphics, stroked lines were rendered too
thin.  (gspaint.c)
	- The default map_cmyk_color implementations could return
"transparent".  (gxcmap.c)
	- The number of bits of alpha requested when rendering anti-aliased
characters could exceed 4.  (gschar.c)
	- Multi-screen halftones could cause errors or infinite looping when
banding.  (This problem predates 4.0; I don't know why it didn't show up
before.)  (gxcldev.h, gxclist.c, gxclread.c)
	- Skewed or rotated gray-scale images, or masks with a halftoned
color, omitted one line of pixels and displaced the image by one pixel.
(gximage2.c)

Adds an implementation of realloc, for systems that don't have one that
works.  I don't know how to determine this automatically, so for the moment,
the code uses our own implementation on Linux (where realloc is known to be
broken, at least in some releases) and nowhere else.  (malloc_.h,
gsmemory.c, gsmisc.c)

Removes the "OLD" algorithms from the Type 1 hinting source code, since they
are no longer executed.  (If necessary, they can be retrieved from an older
version.)  (gxhint3.c)

Version 4.01 (7/10/96)
============

This fixes a few minor bugs discovered since the 4.0 release.