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1991-05-24
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Copyright (C) 1990, 1991 Aladdin Enterprises. All rights reserved.
Distributed by Free Software Foundation, Inc.
This file is part of Ghostscript.
Ghostscript is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY. No author or distributor accepts responsibility
to anyone for the consequences of using it or for whether it serves any
particular purpose or works at all, unless he says so in writing. Refer
to the Ghostscript General Public License for full details.
Everyone is granted permission to copy, modify and redistribute
Ghostscript, but only under the conditions described in the Ghostscript
General Public License. A copy of this license is supposed to have been
given to you along with Ghostscript so you can know your rights and
responsibilities. It should be in a file named COPYING. Among other
things, the copyright notice and this notice must be preserved on all
copies.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
This file, readme.doc, describes problems and new features in the current
release of Ghostscript. This file describes version 2.2 of Ghostscript.
For an overview of Ghostscript and a list of the documentation files, see
README.
New features
============
Note: this is not a complete list of new features. See the most recent
section of history.doc for full details.
The save and restore operators are implemented.
You can select the default (initial) device with the switch
-sDEVICE=<devicename>
The build procedure is now fully automatic -- you don't have to build
*.dev by hand any more.
The default MS-DOS configuration now includes VGA (default), EGA, Epson,
DeskJet, and LaserJet drivers.
There is a new makefile (tbcplus.mak) for use with Turbo C++ and Borland
C++. For Borland C++, you have the option of using code overlaying, which
increases available space by over 100K.
The Epson driver now handles several different densities, including 24-pin
support.
There is now a `supported' PaintJet driver.
Input (but not output) redirection is now supported, using `-' on the
command line.
The -w and -h switches are replaced by a single -g (geometry) switch, with
usage -g<width>x<height>. The -h switch, and a new -? switch, print usage
help.
Accented characters display properly.
Known problems
==============
Interpreter
-----------
The interactive interpreter requires that every statement fit on a line,
i.e., you can't have an unpaired ( or {.
On a MS-DOS system, interrupting Ghostscript by typing ^C doesn't restore
the display mode.
Operators
---------
The Ghostscript language does not include the following operators of the
PostScript language:
resetfile
reversepath
banddevice, renderbands
The following are not implemented completely:
%statementedit (file name): interpreted as equivalent to
%lineedit.
Most of the new color operators, particularly those that support the CMYK
color model, are implemented as Ghostscript language procedures, and they
essentially emulate CMYK using RGB.
The following operators that expect arrays won't accept packed arrays:
definefont (Subrs (type 1 fonts))
setdash (dash pattern)
setcachedevice (bounding box)
makeimagedevice (palette)
Limitations
-----------
Floating point exceptions terminate Ghostscript, rather than producing an
rangecheck error.
Some access checks aren't implemented.
copypage does nothing in the MS-DOS implementation,
and merely synchronizes the X connection in the Unix implementation.
showpage is a procedure that does a copypage and then beeps the bell and
waits for the user to hit a key. (copypage does do the right thing for
printers.)
Graphics bugs
-------------
The wrong thing happens at grestore if you add to an existing path
after a gsave.
The transfer function is used only for stroking, filling, and imagemask,
not for image or colorimage.
strokepath doesn't work for dashed lines.
clip and eoclip replace the clipping path with the current path,
rather than with the intersection of the two paths.
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.
The implementation doesn't look at the Metrics in the font; it always
uses the metrics supplied by the character.