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Copyright (C) 1990, 1992, 1993, 1994 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, current.doc, describes problems and new features in the current
release of Ghostscript. This file describes version 3.0 of Ghostscript.
For an overview of Ghostscript and a list of the documentation files, see
README.
New features (since release 2.6.1)
============
Note: this is not a complete list of new features. See the NEWS file for
full details. (NEWS is a very large file, since a lot has happened since
release 2.6.1.)
Ghostscript now is an essentially complete PostScript Level 2
implementation. This involved adding many, many new features, which we
don't spell out here.
Fonts
-----
MultiMaster fonts and Type 0 (composite) fonts are now supported. It is
possible to compile simple Type 0 fonts for linking with the executable,
just like Type 1 fonts.
Courier is now the default font, replacing Ugly. Font substitution is
somewhat more intelligent.
The new environment variable GS_FONTPATH can hold a list of directories
which Ghostscript will scan at startup, finding all fonts in them
automatically.
There is documentation on how to use the Microsoft Windows PostScript
printer driver to convert TrueType fonts to Type 1 fonts embedded in the
document.
New fonts are provided: shareware Hiragana and Katakana fonts, and good
quality work-alikes for Times Roman and Helvetica.
A new fontmap, Fontmap.ATB, is designed for use with Adobe Type Basics.
The BitmapWidths flag in fonts is now supported. The default is false,
which means that scalable widths will be used even with bitmap fonts. This
eliminates the problems with ragged margins, overlapping characters, or
large white spaces on X Windows.
Platforms and devices
---------------------
New platforms are supported: DesqView/X (using djgcc and go32), Intergraph
Clipper, OS/2, OS-9, Win32, Win32s.
New printers are supported: H-P LaserJet 4, StarJet 48. New PCX formats
(8-bit gray scale and 24-bit color) are supported. New displays are
supported: Linux VGALIB, OS/2 PM.
The X Windows driver now doesn't use the default background and foreground
colors; you must set foreground and background explicitly for Ghostscript
if you want them to be other than black and white respectively.
Selecting A4 paper size as the default for nearly all printers now only
requires uncommenting a single line in gs_init.ps.
A new, faster set of fax output drivers are provided. However, the
DigiBoard drivers have been removed.
Other
-----
The new ps2ai.ps utility, contributed by a user, converts arbitrary
PostScript files into a form compatible with Adobe Illustrator.
The GNU License has been replaced with a different license that is nearly
equivalent for non-commercial distribution, but prohibits commercial
distribution. See commprod.doc and PUBLIC for details.
The source code now compiles cleanly with ANSI compilers that require
prototypes for all external functions (such as gcc).
The -dSAFER switch now disallows writing, deleting, or renaming files,
either through explicit operators or by setting the OutputFile of a device;
it does, however, allow use of the -sOutputFile= switch on the command
line.
Many new ISO and CAD paper sizes are supported by name.
One can now compile and link the init files into the executable; together
with compiled fonts, this allows creating a self-contained executable that
requires no external files other than Fontmap.
Known problems
==============
Usage
-----
On a MS-DOS system, interrupting the interpreter by typing ^C doesn't
restore the display mode.
Limitations
-----------
serialnumber returns the same value in all copies.
The realtime operator is not implemented.
User names (a Display PostScript facility) are not implemented.
Floating point exceptions terminate the interpreter, rather than producing
a rangecheck error.
The DCTEncode filter disregards the Blend parameter, and uses different
QuantTables and HuffTables from Adobe's.
The DCT filters do not support nonintegral sample ratios, and do not allow
Sum(HS*VS)>10, regardless of the value of the Relax parameter.
The size of the execution stack cannot be changed dynamically. (However,
the sizes of the operand and dictionary stacks can be changed.)
Separation color spaces are implemented, but devices that actually produce
color separations are not supported. The special color separations All and
None, and the primary separations (Red, Green, etc.), are not supported.
sethalftone disregards the TransferFunction and AccurateScreens entries in
halftone dictionaries.
The image operator disregards the Interpolate flag in the image dictionary.
execform and ucache are implemented, but they do not actually do any
caching; setucacheparams and ucachestatus are dummies. (This only impacts
performance, not functionality.)
The framework for setpagedevice is present, but the operator (procedure)
itself is disabled. See NEWS for details.
Graphics bugs
-------------
The implementation only looks at the PaintType of the font when doing
show, not when doing charpath. Because of this, stroked fonts don't work
correctly with charpath.
arcto gives an error for negative radii.
Opening more than one window device at the same time doesn't work.
This is the case for both X Windows and Microsoft Windows.
setpagedevice affects the driver, not just the current graphics state.
Consequently, restore / grestore / grestoreall / setgstate may not undo
setpagedevice.
cshow doesn't work with composite fonts.
Non-graphics bugs
-----------------
The %statementedit pseudo-file is equivalent to %lineedit. As a
consequence, the interactive interpreter requires that every statement fit
on a line, i.e., you can't have an unpaired (, {, or <.
The following operators that expect arrays won't accept packed arrays:
definefont (Subrs (type 1 fonts))
setdash (dash pattern)
setcachedevice (bounding box)
makeimagedevice (palette)
Syntax errors occurring within a binary token do not produce the error
message specified by the Adobe documentation.
restore doesn't undo currentgstate.
restore doesn't restore the user parameters.
Fonts defined with definefont will be visible to the resource machinery,
but fonts defined with defineresource will not be visible to findfont.
Fonts are placed in global or local VM according to the current allocation
mode, rather than according to the FontType.
Font substitution and font aliasing work with findfont, but not with
findresource on the Font category.
1 vmreclaim is equivalent to 2 vmreclaim -- there is no separate GC for
local VM.
Group 4, and 2-D Group 3, CCITTFaxEncode filters don't work. This also
affects the faxg32d, faxg4, tiffg32d, and tiffg4 drivers.
The TIFF driver doesn't work for page sizes other than letter, A4, or B4,
and doesn't work for any resolution other than the two standard fax
resolutions.