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Copyright (C) 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. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - This file, history.doc, describes the changes in older releases of Ghostscript. For more recent changes, see the NEWS file. For an overview of Ghostscript and a list of the documentation files, see README. Version 2.6.1 (5/28/93) ============= This is primarily a bug-fix release for 2.6, with a couple of minor additions. Documentation ------------- Adds proper `man' pages ansi2knr.1 and gs.1. Procedures ---------- Fixes bugs: - The Unix makefile produced an incorrect linker command if EXTRALIBS was not empty. - The Unix install commands didn't copy devices.doc, ps2epsi.doc, and xfonts.doc to the documentation directory. - echogs.c didn't include <sys/types.h>, which is needed for time_t on some systems. - malloc_.h used <malloc.h> rather than <stdlib.h> on NeXTStep systems. Changes the configuration procedure to use a C program rather than complex shell scripts. Utilities --------- Fixes bugs: - The boilerplate produced by ps2image used the 'max' operator, which is not a standard PostScript operator. - The winmaps.ps utility had 'floring' instead of 'florin' in the OEMEncoding table. - quit.ps was omitted from the PC distribution. Changes the name of the dicttomark procedure to .dicttomark. Renames gs_2asc.ps as ps2ascii.ps, so it matches the names of the script files. Drivers ------- Fixes bugs: - The pbmraw driver was writing out RGG instead of RGB values. - The X11 driver used NULL in a place where it should have used None. - For multi-file output, the GIF driver didn't write a header at the beginning of each file. - The Epson driver didn't honor the -A4 compilation switch, didn't put (0,0) at the physical corner of the page, and was too liberal about using tabs instead of spaces. Replaces the color handling algorithms in the X Windows driver with new, much better ones. Makes the PC display drivers recognize the -A4 compilation switch, like the printer drivers. Adds new user-contributed drivers: - A driver for Epson printers that use the ESC/P 2 control language, such as the Stylus 800. - A driver for the Apple Dot Matrix Printer and Imagewriter. Adds a new get_xfont_device driver procedure. This is a backward-compatible change, since there is a sensible default. Platforms --------- Fixes bugs: - On VMS, gconfig.h didn't have #include "gsconfig.h" as its first line. - gconfig.c compiled incorrectly on the RS/6000 because the compiler evaluated a constant of the form (x<<y)+z incorrectly. - Quite a few files that used the mem... functions didn't include memory_.h, which caused trouble on some bsd4.2 systems. - The definition of zfont_char_xglyph confused one of the AIX compilers. - On VMS, DEC C allows extra arguments for fopen, but gcc doesn't. - On the MS Windows platform, 2.6 used gdevwddb rather than gdevwdib; the latter is almost always faster. - The PC .zip files didn't include the Windows .ICO and .RES files in either GSEXE.ZIP or GSFILES.ZIP. On PC platforms, adds an option (FPU_TYPE=-1) to optimize for machines lacking a floating point processor. Fonts ----- Adds 4 new fonts contributed by URW. These have a URW copyright and are governed by the GNU License. Documents the fact that font names in Fontmap can be strings, not only names. Adds DingbatsEncoding as a predefined encoding (in addition to Standard, ISOLatin1, and Symbol). Interpreter ----------- Fixes bugs: - memchr (used in zfile.c) isn't available on all platforms. - languagelevel was defined as an operator rather than an integer. - iccfont.c referred to name_StandardEncoding instead of #include'ing font.h and referring just to StandardEncoding. - The CCITTFaxDecode filter didn't work on 32- (or 64-) bit machines, because of a bug in more_bits(). - The structures recording an allocation within the scope of a save could get allocated unnecessarily, because they weren't properly marked as free when an array was freed. Renames the following Ghostscript-specific operators by adding a '.' at the front: makeoperator, setdebug, setmaxlength, stringmatch, type1decrypt, type1encrypt. Adds a real implementation of glyphshow. Library ------- Fixes bugs: - Discarding fractional character coordinates in the Type 1 rasterizer led to some rendering anomalies (e.g., characters 1 pixel too high). - If a font had a non-standard encoding (i.e., not StandardEncoding, ISOLatin1Encoding, or SymbolEncoding), Ghostscript would never invoke the platform font code. - The RGB to HSB color conversion algorithms produced nonsensical values. - struct cached_char_s was defined redundantly in gxcdir.h, causing compilation problems on some systems. - 32-bit color devices didn't work properly on little-endian machines (arrange_bytes in gdevmem2 was wrong). - The scaled font cache could confuse two fonts with the same UniqueID and different Encodings. - Under many common circumstances (first use of a character was with stringwidth, the font was renamed, the font encoding was changed), xfonts would not be used. Adds gs_glyphshow. Version 2.6 (5/9/93) =========== The main new feature in this release is the ability to use platform fonts. It also adds many more Level 2 PostScript facilities. Documentation ------------- Corrects some errors in the documentation of the makeimagedevice operator. Adds operand and result types to the comments at the beginning of all the operators. Adds new sections on installation in use.doc. Reinstates history.doc as a repository for old and no longer interesting history information. Adds a new file, devices.doc, with documentation for specific devices. Points out that font2c must be run with a Fontmap that includes the fonts being converted, and that its arguments must be quoted with "" on VMS systems. Notes that the font name in the Fontmap must be the same as the FontName in the font. Adds a list of the Level 2 facilities not provided by Ghostscript. Identifies bug-ghostscript@prep.ai.mit.edu as an alias for the gnu.ghostscript.bug newsgroup. Points out explicitly that -sOutputFile=- sends output to stdout, and requires using the -q switch. Documents the use of tar_cat to construct the Unix makefiles. Adds a new file, xfonts.doc, that describes the external font interface. Documents the fact that drivers must use gs_malloc and gs_free rather than malloc and free. Documents the *.sh (shell script) files. Adds brief documentation on some additional development tool .ps files. Documents the TEMP and GS_OPTIONS environment variable. Points out the need to run Windows in 386 Enhanced mode on machines that have less than 6 Mb of RAM. Consolidates documentation on compiler switches in make.doc (some of it had been in the unix*.mak files). Procedures ---------- Fixes bugs: - \'s in arguments following -- were doubled. Includes the full set of filters automatically if the level2 feature is selected. Extends DEVICE_DEVS... up to DEVS9. Adds DEVICE_DEVS1 as well. Renames turboc.mak and tbcplus.mak as tc.mak and bc.mak. Makes @-files use the library path (GS_LIB, -I). Changed the Unix install script to use install <file> <destfile> rather than install <file> <directory>. Adds a GS_OPTIONS environment variable that acts like an implicit @-file at the beginning of the command line (i.e., may contain switches and initialization files). Renames sym__enc.ps as gs_sym_e.ps. Adds a user-contributed shell script for using Ghostscript with an H-P printer spooler. Adds level1.ps to the set of installed utility files. Extends the TEMP environment variable (the directory for scratch files) to work on Unix as well as MS-DOS. Changes the MS Windows makefile to generate gswin.exe rather than gs.exe, and the Watcom makefile to generate gs386.exe. Moves the "product" string from gs_init.ps to iinit.c. Adds a GS macro to the makefiles, to allow choosing the name of the executable. Utilities --------- Fixes bugs: * - font2c did the wrong thing (still) for fonts that didn't use StandardEncoding, ISOLatin1Encoding, or SymbolEncoding. * - impath.ps had a fatal bug (wrong operand order for charstack_write) that caused bdftops to fail. - gslp didn't wrap or truncate lines. - gslp didn't handle tabs in a second or subsequent column properly. - The definition of ashow in gs_2asc.ps incorrectly undid the increment following the last character. - The definition of awidthshow in gs_2asc.ps failed to pop two entries from the stack, and also tested the character against the wrong value. Adds a shell script (sysvlp.sh) that interfaces Ghostscript with the System V 3.2 lp interface. Adds ps2ascii and ps2epsi script/batch files. Adds a new utility, mergeini.ps, for concatenating all the Ghostscript initialization files into a single file, optionally removing comments and blank lines. Adds new switches to gslp: -q: suppress all printed output. --detect: check whether the file begins with %!, and if so, interpret it directly as a PostScript file. --first-page <page#>: replaces the former -P switch. --last-page <page#>: replaces the former -Q switch. --(heading|footing)-(left|center|right) <string>: define headers/footers. # inserts the page number. --margin-(top|bottom|left|right) <inches>: define margins. --spacing <n>: for double, triple, etc. spacing. Also makes gslp ignore all the enscript flags it doesn't implement. Adds an option to wrfont.ps to do encryption at read-in time. (This allows much better compression of the standard Ghostscript fonts.) Changes bdftops to use this option. Changes gslp to accept wild cards in file names. Replaces landscap.ps with a new one contributed by a user. Changes the compression scheme used in ps2image to a much more effective one. Writing images is much slower than with the previous scheme, but reading is not. Platforms --------- Fixes bugs: - SCFDTAB and SCFTAB were omitted from the VMS module lists. - Function prototypes were not being used with the Watcom compiler. - On MS-DOS platforms, if the value of the TEMP variable had a trailing : or \, Ghostscript appended a \ anyway. - Under Windows, changing the size or resolution of the image closed and reopened the window. - Ghostscript would not build correctly with the Watcom compiler if DOS4G=quiet was not set, because the DOS4GW copyright message was sent to stdout. * - Finally gets Ghostscript to run properly on the RS/6000, by adding a compiler bug workaround to arc_add and arc_either. * - Finally gets Ghostscript to compile properly on Sun SPARC systems, by adding a compiler bug workaround in scan_number. Changes the default MS-DOS configuration from 8086/8088 to 80286. Adds all the SuperVGA drivers to the BC++ and Watcom executables (except for the VESA driver in the Watcom executable). Adds a makefile (msc.mak) for the Microsoft C/C++ 7.0 platform. This is currently a MS-DOS, not a MS Windows, platform. Changes gp_enumerate_files_init so it takes a gs_memory_procs *, not separate proc_alloc_t and proc_free_t arguments; also, it must enumerate precisely the requested set of files, not a superset. THIS IS A NON-BACKWARD-COMPATIBLE CHANGE. It affects all gp_*.c files. Adds the P*M drivers and bit.dev to the standard configuration on Unix platforms. Changes the Watcom makefile so it uses the WATCOM environment variable (by default) as the base directory for the Watcom executables. Adds the MS Windows COMMDLG.DLL and SHELL.DLL files to the set of files incorporated in GSEXE.ZIP, since the new MS Windows code uses them, and they aren't provided with Windows 3.0. Makes major revisions to the MS Windows platform and driver code, to support the gsview front end, and also to remove the dependence on the Borland EasyWin library. NOTE: Compiling the MS Windows code now requires Borland C++ 3.1 (not 3.0). Changes time_.h so that Ghostscript will compile and run on A/UX. Changes the MS-DOS implementation of file enumeration so it always treats \s in the file name as literal characters, not escapes, unless there are two \\s in a row. This does the most sensible thing given the DOS file naming conventions. Adds a %pipe% file device under Unix. Adds a makefile for Watcom C under MS Windows. This is very preliminary; in particular, NO display output is supported. Fonts ----- Fixes bugs: - fonts.mak referred to ncri and puti rather than ncrri and putri. - cyr and cyri had the wrong protection. - The Hershey fonts left the font on the stack when they were loaded. * - The FontName of an aliased font was the original FontName from the file, not the alias. * - Fontmap.BTS had incorrect entries for AvantGarde-Demi and AvantGarde-DemiOblique. - Ghostscript pushed userdict, rather than an empty writable dictionary, onto the stack when loading a font, leading to name clashes. Adds a new cfonts.mak with a full set of rules for compiling all the standard Ghostscript fonts (except the Hershey fonts) into C. Adds UniqueIDs to the Hershey fonts, and removes the UniqueIDs from the Hershey entries in the Fontmap. Adds a new Fontmap for VAX/VMS with DECWindows/Motif. Changes MakeHersheyFont so it takes the encoding as an additional parameter, and changes the Hershey-Symbol font to use SymbolEncoding. Drivers ------- Fixes bugs: - The !@*&^%#@$ PCL drivers *still* didn't do the right thing about vertical spacing: the <ESC>*p+<n>Y command works on all PCL 3, 4, and 5 printers *except* the LaserJet IIp. - The cdj driver used recursive macros (height, t_margin, b_margin) that not all compilers handled correctly. - The djtc driver used some assignments including =*, which some compilers dislike. - The S3 driver wouldn't compile correctly with the Watcom compiler. - The makefile entry for the S3 driver was wrong. - The SuperVGA drivers returned an error, rather than using the highest available resolution, if a too-high resolution was requested. - The GIF driver produced an incorrect header for images wider or taller than 32K pixels. - The GIF driver wasn't able to handle multi-page documents correctly. - The margins on the DeskJet were still not correct. - Some ANSI C compilers rejected a complex expression in gdevpccm.c. - Printer drivers didn't recover cleanly from problems in opening the scratch files. - The BJ-10e driver used the same name `out' for a label and a variable. - The SCO ODT compiler couldn't handle sizeof(ppdev->fname). - The Epson driver used the wrong value for ESC in the initialization string. Adds new drivers: - Drivers to produce MS Windows .BMP format output. - A new ATI Wonder display driver (800x600, 16 colors) and a 1024x768 mode for the existing driver. Adds new user-contributed drivers: - A driver for the Tektronix 4693d color printer. This carries a university copyright. - A driver for the SPARCprinter. - A driver for the Canon BJ200 printer. - A driver for the IBM ProPrinter. - A driver for the DEC LJ250 printer, which has a PaintJet-compatible mode. - A replacement driver for the Sony NWP533. - A driver that writes TIFF/F (Group 3 fax) files. This carries an external copyright. - A driver for the C.Itoh M8510 printer. - A driver for the Okidata MicroLine 182 9-pin dot-matrix printer. - A Hercules Graphics driver. - A driver for printers under MS Windows. - A driver for direct frame buffer addressing under SCO Unix and Xenix and AT&T SVR4. Changes the get_bits driver procedure so it always reads a single scan line, and optionally does not copy the data. THIS IS A NON-BACKWARD-COMPATIBLE CHANGE. However, this change does not affect any existing printer driver, since these all go through intermediate routines in gdevprn.c. Changes gdevprn.h, and the relevant printer drivers, so that -DA4 will change the default paper size for any printer driver. Allows the use of NULL or 0 for default procedures in the driver procedure vector. Adds an optional map_cmyk_color procedure to the driver procedure vector. Changes the Epson driver so that the minimum amount of white space required to use a tab is an easily changed parameter. Changes the BGI driver to use separate segments for the Borland device drivers, to reduce the risk of overflowing a segment. Adds an optimization option (normally enabled) to the PGM and PPM drivers such that they revert to PBM or (for PPM) PGM if the page can be represented that way. Adds a new (optional) driver procedure to get the procedure vector for external fonts. Adds an argument to gp_open_printer to indicate whether the file should be opened in binary or text mode. THIS IS A NON-BACKWARD-COMPATIBLE CHANGE. However, this change does not affect any existing printer driver, since these all go through intermediate routines in gdevprn.c. Changes the LN03/LA50/LA75 driver so it uses a text record mode to open the output file under VMS (by adding an argument to gp_open_printer to indicate this.) Allows (indeed, encourages) drivers to use far_data to declare the device structure, primarily to avoid overflowing the 64K data segment under MS Windows. Changes the file output drivers and many of the printer drivers to declare their device structures as far_data. Replaces the AT&T 3B1 driver with an updated version (from the same contributor). Changes the Epson BJ driver and the SPARCprinter driver so they align the (0,0) point of the page with the physical corner of the paper rather than with the origin of the printable area. Removes the EIZO MDB-10 driver, since it caused complications for the EGA and VGA drivers and is not a widely used device. Interpreter ----------- Fixes bugs: - The entry for the copydevice operator in the operator table was initialized incorrectly. - printobject and writeobject didn't handle nested arrays. - restore didn't properly close the current file (if appropriate), causing an invalidaccess error. - buildfont required the presence of a valid, 4-element FontBBox. (The Red Books say it's required, but Adobe interpreters don't require it; some DEC software generates a 3-element FontBBox.) - resourceforall had several bugs; it didn't do even approximately the right thing. There were quite a few other problems with the implementation of resources. - setfont, makefont, and scalefont would accept a font with no FID entry. * - Loading a .PFB font left the file open (until the next restore or quit). - The default (null) font didn't include a PaintType entry, which some PostScript files expected. * - The ASCIIHexDecode filter sometimes thought the underlying stream was at EOF even when there was (at most one buffer's worth of) data left. - iscan.c included <ctype.h> before std.h, causing type name clashes on some systems. * - save and restore didn't handle the pointers in the graphics state correctly; for example, the current font wasn't restored properly. - Binary object sequences at the top interpreter level didn't get executed immediately. - On high-resolution devices, the default transfer function converted almost-white grays to very light grays rather than white. - The `string' operator was checking the string length against max_uint rather than max_ushort, which could cause invalid lengths to be accepted. * - deviceinfo caused a stackunderflow error. * - idiv could give incorrect results for quotients or remainders that didn't fit in 24 bits. * - The ASCII85Encode filter padded trailing bytes with 1's rather than 0's. * - The ASCII85Decode filter had a typo that produced incorrect results if there were exactly 2 trailing bytes. - findlibfile didn't push a copy of the file name if it was the name of a special (%) file. - setduplexmode was not defined in statusdict, causing /undefined errors from some poorly designed input files. * - The CCITTFaxDecode filter had several bugs in 2-D decoding. * - The ASCII85Decode filter didn't read ahead to detect EOD if it fell precisely on a buffer boundary. - If a file mentioned on the command line redefined `start', Ghostscript would run the new definition rather than the built-in one after processing all the files on the command line. - The SCO ODT compiler couldn't handle the conditionals in the ngetc (iscan.c) and sgetc* (stream.h) macros. - makefont and scalefont didn't cache the PostScript dictionaries for scaled fonts. - Changing the elements of the Encoding of a font dynamically didn't take effect if the character was already cached. - makefont and scalefont didn't add the (undocumented) OrigFont and ScaleMatrix entries to the new font. * - findfont insisted that the font name be a string or a name. - filenameforall could cause an incorrect transfer of control if no files matched the pattern. * - ISOLatin1Encoding had hyphen instead of minus at code 45. - restore didn't reset saved_cbot and saved_ctop correctly; as a result, some freed blocks could get abandoned rather than put on the free list. - Some numerical constants in zarith.c assumed that longs occupied 32 bits. Implements additional Level 2 features: - %device%file names (only the "os" device is provided). - <~ ~> for ASCII-85 strings. - Binary error messages. - BuildGlyph. - CCITTFaxDecode filter entries EndOfBlock, Rows, and (undocumented) FirstBitLowOrder. - {set/current}{color/colorspace/overprint/colorrendering/ blackgeneration/undercolorremoval}. (See below under library for limitations.) - Decode for the dictionary form of image. - File access modes a, r/w/a+. - Font entries CDevProc, Metrics2, and WMode. - Font operators cshow, findencoding, rootfont, and setcachedevice2. - glyphshow (emulated with PostScript code). - languagelevel. - realtime. - setbbox. - (Subset of) system and user parameters. - xshow, yshow, and xyshow. - XUIDs for fonts. Moves the installation of systemdict and the initial allocation of globaldict (if relevant) and userdict from gs_init.ps to iinit.c. Makes Level 2 features dynamically selectable through the .setlanguagelevel operator; disables all Level 2 features (specifically including automatic dictionary expansion) unless the level2 feature is included and active. Adds the .knownget operator for speeding up system procedures. Renames the type1addpath operator as .type1addpath; adds an optional left side bearing argument; changes it so it does not do the setcachedevice, fill, or stroke, but does do a moveto for the character width. Changes Type1BuildChar appropriately. (All this is needed to make WMode work.) Removes the .setmetrics operator, which is no longer needed. * Changes the meaning of the user_errors argument to gs_run_file and gs_run_string so that -1 means always return on an error, 0 means only return on an error not within a `stopped'. Adds all the necessary checks and operators for local/global VM, but doesn't actually implement local/global mode. Changes setcachedevice back so that it requires 4 numbers on the stack rather than a 4-element array. (It was changed to be the other way in release 2.0, but that was because I didn't realize that fonts had to have an executable FontBBox, and some of the Ghostscript fonts didn't.) Changes all the filter operators from .filterxxx to .filter_xxx, and removes the need to enumerate them in gs_init.ps. Adds .oserrno and .oserrorstring operators for getting the last OS error (in the current context). Changes gs_finit similarly to gp_exit. Adds gs_exit_with_code that takes both an exit status and a Ghostscript error code. Changes the name of name.h to iname.h. Adds support for the `interrupt' error (but doesn't provide any standard way of generating one, other than through the gp_check_interrupts polling function). Adds copyright to systemdict. Changes the spot halftone screen to an elliptical screen supplied by Berthold K. P. Horn. Adds a check that the first token in gs_init.ps is an integer. In conjunction with other code in gs_init.ps, this should catch all attempts to run Ghostscript with a gs_init.ps that doesn't match the executable. Changes all relevant occurrences of sizeof to size_of in order to work with the buggy SVR4.2 C compiler. Changes gp_exit so it is passed both the Ghostscript error code and the exit status code as arguments. This is backward-compatible for all but the pickiest compilers. Adds a call on gp_check_interrupts() after fwrite calls in the stream machinery. This prevents lengthy console output from locking out other programs. Changes a couple of occurrences of op_def_ptr in iinit.c to work around a `const' bug in Sun's SC1.0 compiler. Adds a special hack in the 'where' operator to work around a bug in Aldus Freehand 2.x. Changes all empty argument lists from () to (void), which is the ANSI C syntax. Adds a hack to ignore ^[ and ^D^[ tokens, to work around the prologue and epilogue emitted by the MS Windows LaserJet IV driver. Defines the processcolors operator, which should not be needed, but is required because of bugs in Lotus 1-2-3 and Adobe PhotoShop. Changes the allocator (ialloc) to fill all allocated and/or freed blocks with a marker if gs_alloc_debug is set, as gs_malloc and gs_free already do. Library ------- Fixes bugs: - 16-bit memory devices stored the bytes of each pixel in the wrong order. - copy_mono did the wrong thing when copying 1 source chunk to 2 destination chunks with polarity inverted. (This probably didn't affect any actual uses of Ghostscript.) * - The compile-time check for ints being 2 or 4 bytes used the #error directive, which most compilers don't recognize. - arc and arcn didn't do the right thing for degenerate (single-point) arcs, or for arcs drawn in the "wrong" direction that were multiples of 360 degrees. - charpath did the wrong thing with Type 3 fonts. - copyscanlines gave an error if the buffer was too large. - The copy_mono procedure (used for text and halftones) for 2- and 4-bit-per-pixel memory and printer devices incorrectly incremented the destination pointer after every pixel, instead of only after every byte. - The fill_rectangle procedure (used for graphics) for 2- and 4-bit-per-pixel memory and printer devices, if given any color other than all 0's or all 1's, multiplied the X coordinate and width by 2 or 4, thereby filling the wrong area. - The use of 'data' in both gs_type1_data and gs_font upset the VMS compiler. - The `Flex' feature wasn't implemented for Type 1 fonts, which caused serious errors in rendering some fonts that use it. (Unfortunately, some Adobe fonts violate the specification, so we had to implement Flex to always use a curve.) * - Stem width adjustment was too eager, producing very strange effects on small characters with tight curves (a curve point could get snapped to the other side of the open area). - The allocator didn't align structures adequately on machines where sizeof(long) or sizeof(char *) was 8 bytes. - The test for IEEE floating point gave an incorrect (negative) result on machines where sizeof(long) was 8 bytes. - genarch.c assumed that the result of subtracting two pointers was an int, leading to a garbage arch.h file on systems where this was false. * - The Type 1 font interpreter incorrectly reset the adjusted path position to be the same as the unadjusted path position whenever it returned control to the client (in particular, for callothersubr), leading to discontinuities and distortions in the character shapes. * - Accented characters in Type 1 fonts often misplaced the accent to the left. - gsmisc.c wouldn't compile on machines with 64-bit pointers, because _pad was 0, and ANSI compilers don't accept 0-length arrays. - pathforall got confused if the client procedures modified the path. - The command list file representation limited X and Y coordinates to 15 bits. * - stroke could produce spikes or other garbage for mitered joins as a result of stroke adjustment. - The params_size field of the null device was wrong, so scaling the null device produced unpredictable results. Changes monobit memory devices to always store data big-endian. This eliminates byte-swapping, at the cost of slightly slower rendering. Removes the memswab* routines, since they are no longer needed. Implements gs_cshow_[n_]init, which provides support for cshow, and gs_xyshow_[n_]init, which provides support for {x,y,xy}show. Adds an optional left side bearing argument to gs_type1_interpret. Changes gs_type1_interpret so it does not do a setcachedevice, fill, or stroke, but only appends the character outline to the path (including a moveto for the character width.) Removes gs_setmetrics, which is no longer needed. Implements gs_setcachedevice2, which provides support for setcachedevice2. Speeds up gsave/grestore by allocating, deallocating, and copying as much as possible of the graphics state in a single operation. Implements gs_{set/current}{color/colorspace/overprint/colorrendering/ blackgeneration/undercolorremoval}. Device, indexed (with table, not with procedure), CIE, and (substituted) separation colors are supported; some of the setup code for patterns is also present. Increases the size of temporary file names in gdevprn.h from 30 characters to 60. Changes the character cache to be allocated dynamically in chunks. Splits gxcache.c into gxccache.c (fast "hit" code) and gxccman.c (all other code). Changes all occurrences of sizeof to size_of in order to work with the buggy SVR4.2 C compiler. Adds a new concept of "external fonts", which allow a driver to substitute its own fonts for the ones obtained through the normal font machinery. Changes all empty argument lists from () to (void), which is the ANSI C syntax. Version 2.5.2 (9/20/92) ============= This is yet another bug fix release to (finally!) get the PCL drivers working again. Procedures ---------- Fixes bugs: - The comment in devs.mak for cdjcolor said it used 8 bits per pixel, rather than the correct 24. Adds gsbj/dj/lj/lp and gslp.ps to the installed files on Unix systems. Removes dps.dev and level2.dev from the standard configurations on all platforms, since the presence of the setcolor operator was causing the output of some common applications to fail. Utilities --------- Fixes bugs: - font2c produced invalid output for any font that didn't use StandardEncoding or ISOLatin1Encoding. Platforms --------- Fixes bugs: - gp_sysv.c required an extern long timezone. Drivers ------- Fixes bugs: - The PCL drivers were *still* doing the wrong thing about zeroing the seed row for Mode 3 compression. - Setting the resolution with -r didn't work under Windows. - The Windows driver got a stack overflow if it was ever asked to display a bit image wider than 32 pixels. - The Tseng driver didn't sense the model (ET3000 vs. ET4000) correctly. Adds the eps9high device to the standard MS-DOS makefiles. Interpreter ----------- Fixes bugs: - gs_run_string used gs_user_errors (a global) rather than user_errors (its argument) to control error handling. (This does not affect normal operation of Ghostscript, only use as a server.) - eexec popped the top element of the dictionary stack afterwards even if the encrypted code had pushed something onto it. This caused problems for some badly written PostScript code. - The printed form of real numbers didn't always include a decimal point, causing compatibility problems. Makes -s and -d work for device properties. Increases the cache limit on large-memory systems. Adds a check to ensure that the revision of gs_init.ps matches that of the interpreter. Adds the .knownget operator. Library ------- Fixes bugs: - The raster computation in clist_render_init, and the computation of state_size in clist_open, didn't widen an operand to long, leading to possibly incorrect operation for 24-bit-per-pixel printers on MS-DOS systems. - The flatness was set too large for Type 1 characters, leading to visible straight edges instead of curves at large sizes. - Type 1 fonts that contained out-of-range coordinates would produce garbled output. (This was not a problem with the standard Ghostscript fonts, or with Adobe Type Manager fonts.) - gschar0.c wouldn't compile, because it referred to a non-existing structure member penum->chr. (This had no effect on Ghostscript's operation.) - The curve flattener required line segments to be no more than 8 x the flatness in length, leading to an enormous number of segments. - pathforall would cause an addressing fault if the path consisted of only a moveto. Refactors some header files so that std.h is always included before any system header file that might include sys/types.h. Adds logic for removing top and bottom blank rows in cached characters. (This is the beginning of compression for the cache.) Changes the arguments of memswab2/4 from char * to byte *, for more accurate type conformance. Version 2.5.1 (9/11/92) ============= This is the usual bug fix re-release. Procedures ---------- Fixes bugs: - The makefile rules for compiled fonts had a circular dependency. - `make begin' didn't work properly on all platforms. Ensures that all batch files end with a newline. (The absence of the newline was confusing the GNU diff program.) Documents the fact that the -dASCIIOUT switch no longer exists. Utilities --------- Fixes bugs: - pstoppm didn't `bind' its internal procedures. - grestoreall would undo the output device selected by pstoppm. Changes the utilities for reading and writing Type 1 character outlines so they can work with stack representations as well as arrays. Removes the pfbtogs.ps, phonbook.ps, and showpbm.ps utilities from the distribution. Adds a gslj utility to parallel gslp and gsdj. Platforms --------- Adds the DeskJet 500C drivers (cdeskjet/cdj*) to the MS-DOS / Borland C++, MS-DOS / Watcom C/386, and MS-Windows configurations. Removes the PCX file driver from the MS Windows executable, because the static data segment exceeded 64K. Makes some changes in the Unix System V platform file (gp_sysv.c) and in time_.h and unixtail.mak to accommodate the 3B1. Fonts ----- Fixes bugs: - The Charter-Italic font was named bchi.pfa rather than bchri.pfa. - The Cyrillic fonts (cyr.gsf, cyri.gsf) were omitted from the fileset. - Ghostscript incorrectly assumed that all Type 1 fonts had a FontInfo dictionary. - .loadfont used false PFBDecode, so a few .PFB fonts would get errors because the first eexec byte would be whitespace. Changes font2c and its supporting code so that compiled fonts are location-independent. Drivers ------- Fixes bugs: - The margins for the H-P printers were still wrong. - The H-P drivers accidentally cleared the compression seed row when switching compression modes. - Some of the H-P drivers used the wrong control codes for skipping blank lines. Adds user-supported drivers for the AT&T 3B1 console device, and for the NEC P6+ printer. Updates the SunView driver with a new version supplied by a(nother) user. Changes the X Windows driver so the Ghostscript window doesn't get input focus. Changes the common code for the printer drivers so that if it can allocate a full bitmap but there isn't at least a minimum amount of memory left afterwards, it switches to banding. Changes the Windows driver so it handles devices with more than 8 bits per pixel. (We haven't been able to test this.) Adds a read-only PageCount device property (for printer devices only). Changes all Aladdin-supported drivers to clip drawing requests to the ((0,0), (width,height)) rectangle of device space. Interpreter ----------- Fixes bugs: - Closing a NullEncode filter always gave an ioerror. - If a single-character name occurred 1 character before the end of an input buffer, the character would be doubled. - The procedures in gs_statd.ps didn't use "bind". - Setting the page size didn't work properly with devices with rotated coordinate systems. - If an error occurred, and the error object wasn't the last element of its procedure, the interpreter would re-execute the error object after running the error handler. - Memory devices didn't get resized if HWSize was changed, leading to out-of-bounds memory accesses. Moves revision and revisiondate from gs_init.ps to iinit.c. Adds a -v switch that just prints these out. Arranges things so that if Ghostscript is reading from a pipe (`-' switch on the command line) and encounters an error, it exits with status 1 rather than 0. Changes the interpreter interface so the caller explicitly passes a pointer for storing an error object. Library ------- Fixes bugs: - The automatic adjustment of the scaling for variant paper sizes caused the image to get expanded when it should have been contracted, and vice versa. - The curve flattener insisted that each line segment be no more than 2 x the flatness in length, leading to an enormous number of segments even when not necessary for accuracy. - flattenpath and strokepath discarded a trailing moveto. - strokepath treated "0-width" lines as really having a width of zero, rather than one pixel. - Buffered devices weren't closed and reopened if the amount of buffer space was changed. - stroke used the line cap at the beginning of each subpath even if the subpath was closed. Removes the requirement that the clipping rectangle fall in the non-negative quadrant of device space. (This was causing problems for Ghostview, but removing it required adding the extra clipping step to the drawing routines in the drivers.) Version 2.5 (8/18/92) =========== This version adds Type 1 hinting, CCITTFax encoding and decoding, and Microsoft Windows support, as well as the usual minor improvements and bug fixes. Procedures ---------- Fixes bugs: - GSIMPATH, SLZWD, and SLZWE were omitted from the VMS makefiles, and GSIM2OUT was not removed. - landscap.ps messed up the current path. Adds new switches: -dSAFER disables file writing and directory modification. -dESTACKPRINT causes errors to print the execution stack with == instead of =. -sOutputFile=<string> replaces -sOUTPUTFILE (which is still recognized) for setting the output file or pipe for the default (printer) device. -sPAPERSIZE=<sizename> initializes the paper size. -dBufferSpace=<number> sets the buffer size for the default (printer) device. For Unix systems, changes the directories in GS_LIB_DEFAULT from `pwd` to $(gsdatadir), i.e., normally $(datadir)/ghostscript, where datadir is normally /usr/local/lib. Adds a note in the header file to the effect that the X Windows driver expects to find header files in $(XINCLUDE)/X11, not in $(XINCLUDE). Changes -q so it defines QUIET as true instead of null (so it can be used in the middle of the command line as well as at the beginning). Renames the history.doc file as NEWS. Utilities --------- Platforms --------- Fixes bugs: - The stack size was not getting increased on the Watcom platform. Removes "b" from the scratch file opening modes in gp_unix.c and (conditionally) in gdevprn.c, to pacify the DECstation Ultrix system. Adds a makefile (bcwin.mak) and a platform file (gp_mswin.c) for Microsoft Windows. On MS-DOS platforms (including Windows), uses the TEMP environment variable to designate the directory for scratch files. Changes std.h so that the VMS C compiler uses function prototypes and 'const'. Changes the VMS cc makefile so it doesn't use ansi2knr. Fonts ----- Fixes bugs: - findfont left an extra entry on the stack if it couldn't find the default font. Renames bchi, ncri, and puti as bchri, ncrri, and putri, to conform with the naming scheme for other fonts. Adds $(CCFLAGS) to the command line used for compiling fonts. Converts the .pfa fonts (CharterBT, IBM Courier, and Utopia) to .gsf, by removing eexec encryption and also removing some mysterious unmapped characters from Courier. This makes these fonts work with DISKFONTS. Changes the implementation of compiled fonts so they are read-only and sharable (no external references). (They are, however, not position-independent.) Provides a way to use compiled fonts on platforms that limit the number of characters in an identifier. Adds public-domain Cyrillic and Cyrillic-Italic fonts. Adds a 'userdict begin' to .loadfont, because Type 3 fonts produced by Fontographer expect a writable dictionary on the top of the stack. Changes definefont for Type 1 fonts to insert UnderlinePosition and UnderlineThickness entries in FontInfo if they are absent, because many word processors incorrectly assume these entries are present. Drivers ------- Fixes bugs: - The documentation in use.doc said that the densities for 9-pin Epson printers were 60x60 to 240x60, rather than 60x72 to 240x72. - gdevprn.c smashed one byte beyond the end of the string given as the OutputFile device property. - The X11 driver used XVisualIDFromVisual, which is not defined in X11R3. - The SunView driver modified the input data, which was declared as const. - The LaserJet IIP and III drivers shifted the page 185 pixels to the left and 0.25" down, because the initialization string was incorrect. - The PCX driver wrote 16-bit values using the byte ordering of the platform, rather than always LSB first. - For vertical spacing, the LaserJet and DeskJet drivers used a command that spaces N/300", rather than N scan lines, but gave it a parameter in scan lines. - The VESA driver didn't allocate a full 256-byte buffer for reading the mode information from the BIOS, causing the stack to get smashed by newer VESA implementations. - The VESA driver didn't use the scan line length returned by the BIOS, causing garbage output for some cards and some resolutions. - The generic printer driver didn't free the bitmap when closing the device, if it fit entirely in memory. - The PaintJet driver allocated its data areas on the stack instead of with gs_malloc. - The generic printer driver didn't attempt to increase the buffer size if it was too small. - The band list driver didn't split large bitmaps properly, leading to garbled characters at high resolutions. - The GIF and PCX drivers used a color map that often turned gray colors into non-grays. Changes the default put_props procedure so that if the device is open, setting HWSize and/or HWResolution closes the device and reopens it. Adds a driver for Microsoft Windows 3.n. Updates the 'cdj' and 'dj500c' DeskJet 500C drivers with new versions. (This are user-contributed drivers.) Changes gdev_prn_put_props so OutputFile can be changed dynamically. Updates the DEC LN03 driver to also handle the LA50 and LA75. (This is a user-contributed driver with a FSF copyright.) Changes the LaserJet/DeskJet driver so that -DA4 in the makefile makes A4 paper the default. The driver now also sends an appropriate page size selection command to the printer if the printer supports it. Changes all the Aladdin-supported drivers to return appropriate error codes rather than -1. Adds a driver for the S3 86C911, a PC graphics accelerator used in the popular Diamond Stealth board. This is the first driver that uploads character bitmaps to a device; others will probably follow. Adds user-supplied code to the Epson driver so it will do triple passes on 9-pin printers for higher resolution. Adds user-supplied code for the PaintJet XL to the PaintJet driver. Interpreter ----------- Fixes bugs: - zdps1.c didn't include alloc.h. - On 32-bit systems, if maxlength of a dictionary was less than the actual allocated space, length could become larger than maxlength. - flushfile didn't actually flush data when reading. - The ASCII85Decode filter signalled EOF prematurely. - The scanner interpreted .3D.glorp as the number 0.3, rather than as a name. - Closing a file freed the stream structure, creating dangling references if there were other file objects pointing to the same stream. - eexec called handleerror if an error occurred, instead of letting the error propagate to an enclosing stopped. - gs.h made perror illegal, instead of defining it in terms of strerror. - One-character names weren't being allocated at initialization, so they could be left dangling after a restore. - Internal gsaves (i.e., the ones in show and setcachedevice) didn't also save istate, so setfont inside a BuildChar procedure might cause the font outside to get changed. - The allocator incorrectly freed objects in the current chunk that were older than the current save. - mark was just an object, rather than an operator, so 'bind' didn't bind it. (This is theoretically a problem for null, true, and false also, but even more unlikely to be a problem in practice.) - packed_get didn't cast packed integers to int, so negative integer elements of packed arrays came out wrong. - quit just did a gs_exit, instead of returning to the driver in an orderly way. - Because check_type_access checked for errors in the wrong order, sometimes type errors were reported as access errors. - eq didn't check for stack underflow. - Some of the stream_procs structures weren't properly declared const, leading to link errors on VMS. Implements currentcolor, currentcolorspace, setcolor, and setcolorspace (for DeviceGray, DeviceRGB, and DeviceCMYK only). Implements the dictionary form of image and imagemask. All the pairs in the Decode array must be the same; Interpolate is ignored. The only supported color spaces are DeviceGray, DeviceRGB, and DeviceCMYK. Implements files as allowable sources for the image operators. Removes the index field from the name structure, moving it to the 'size' field of name refs. Changes the unread/sungetc operation to require that the character be the same as the last one read from the file. Adds fflush calls to some debugging printout routines, because Unix sometimes buffers terminal output. Implements the CCITTFaxEncode and CCITTFaxDecode filters. Implements the general case of the SubFileDecode filter. Changes definefont to treat a UniqueID of 0 as equivalent to no UniqueID, because Fontographer output apparently often violates the specification in this way. Changes the default printer screen from 32.5 to 46 cells/inch. (The old value was appropriate for a hand-rotated cell with two spots in it.) Changes the utility routines to allow an integral real wherever an integer parameter is expected in a dictionary, because Fontographer produces fonts that violate the Adobe specification in this way. Adds a `dosio' feature that provides direct access to memory and to I/O ports under MS-DOS. (This feature is not included in the standard executables, of course.) Changes the default character cache limit to a 1/4" x 1/4" character at the default resolution, rather than basing it on the preallocated cache size. Removes support for t_color objects, which haven't actually been used for several releases. Implements setcmykcolor and currentcmykcolor as operators, so they will interact properly with setcolorspace and currentcolorspace. Changes the name of the file.h header file to files.h, to work around a bug in the VMS header library. Adds command line switches @file (to treat file as more command line, to get around the DOS 128-character command line limit) and -ffile (so one can specify file names that begin with - or @). Changes the PFBDecode filter so it takes an additional boolean that says whether or not to convert binary packets to hex. (Conversion to hex and back to binary accounted for a substantial amount of the time required to load .PFB fonts.) Splits off `copydevice' as a separate operator again. Library ------- Fixes bugs: - In the VMS environment, string_.h used its own prototypes for the str... and mem... functions instead of <string.h> - gx_alloc_char_bits declared cdsize as long, but didn't shorten it when passing it to shorten_cached_char. - Stroking didn't suppress fattening of the lines. - kshow didn't update the cached CTM information in the show enumerator when returning from the callout, so further characters could get drawn in the wrong place. - When a memory device returned its initial matrix, it smashed the padding fields, which contained the interpreter's type information. - setcachedevice didn't set the initial matrix in the cache memory device. - image_set_rgb (in the image operators) didn't do a gx_color_from_rgb, so in principle one could sometimes get incorrect colors in an image. - The decision about whether or not to cache a character bitmap incorrectly compared the character size against cmax rather than cdata_size. - show didn't reset the in_cachedevice flag in the graphics state, so characters rendered by a recursive show were never cached. - clip and eoclip didn't release the intermediate flattened clip path, causing memory to be lost. - The tile_diff routine didn't handle the case of two identical tiles properly; this produced garbage in the band list file. - stringwidth didn't round the character origin to an integral pixel; this interacted badly with hinting, causing improperly hinted characters to wind up in the cache. - Bitmaps (including characters) were displaced, as well as being clipped, if they intersected the top of a clipping region. - In gxclist and gdevmem1, the raster computation (although not the result) could overflow an int on 16-bit machines. Implements decoding (sample mapping) for image and imagemask. Implements hinting for Type 1 fonts, based on (but not copying) the algorithms from the X11R5 tape. Changes curve rasterizing to use sampling, rather than recursive subdivision, for characters. This produces noticeably better output. Speed penalty for non-cached characters is less than 10% at display resolutions, up to 50% for 300 dpi printers. Implements gs_setcmykcolor and gs_currentcmykcolor. These are semi-fake, since they simply convert the color to and from RGB, but the former does set the current color space properly. Changes clipping regions so they use the any-part-of-pixel rule rather than the center-of-pixel rule. This helps avoid dropouts when using very small regions. Implements stroke adjustment. Version 2.4.2 (5/8/92) ============= This is another quick release. It finally fixes rotated halftone screens, and cleans up a few minor problems from 2.4.1. This release is being distributed only to beta testers and commercial licensees, since I don't want to be distracted from working on 2.5. Procedures ---------- Fixes bugs: - UTRACE still appeared in the VMS makefiles. - The support files (*.bat, *.doc, *.gsf, *.ps, Fontmap, COPYING, README) weren't included in the MS-DOS tar file. - The Unix install script didn't install landscap.ps. Replaces the type1imagepath operator with PostScript code (impath.ps, type1ops.ps) based on the new .imagepath operator. Renames LICENSE as COPYING. Utilities --------- Fixes bugs: - pcharstr.ps had an occurrence of Subrs rather than /Subrs, causing it to not print the Subrs, or to get an error if there were none. - font2c.ps didn't get the const declarations for string dictionaries quite right. - The missing newline at the end of gsbj.bat confused GNU diff. - ansi2knr would go into an infinite loop if a statement exceeded its internal buffer size. - Compiled fonts would get processed by ansi2knr, which messed them up. Platforms --------- Fixes bugs: - Ghostscript didn't supply equivalents for rename and gettimeofday, which some System V platforms lack. - The missing newline at the end of gp_dosfb.c confused GNU diff. Changes the Borland makefiles so that stack checking is only enabled if DEBUG or TDEBUG is set. Fonts ----- Changes the names of the Utopia fonts from utrg/utb/utbi/uti to putr/putb/putbi/puti, for consistency with the rest of the font names. Changes cour/courb/courbi/couri to ncrr/ncrb/ncrbi/ncri likewise. Replaces the Charter fonts with the CharterBT fonts donated by Bitstream to the X11R5 distribution. Adds font aliasing capability to Fontmap. Replaces Courier-[Bold]Oblique and ZapfChancery-MediumItalic by aliases. Changes the FontBBox of the Hershey fonts to be an executable, rather than a literal, array. Drivers ------- Fixes bugs: - The GIF driver omitted a `private' on the definition of gif_print_page. - The GIF driver wrote 16-bit values using the byte ordering of the platform, rather than always LSB first. - George Cameron's DeskJet 500C driver had an incorrect control sequence for skipping blank lines. Adds 'const' in many places, including the tile and bitmap arguments of the tile_rectangle, copy_mono, and copy_color driver routines. THIS IS A DRIVER INTERFACE CHANGE. (Printer drivers are not affected, since they don't implement these routines.) Adds a driver for the Trident TVGA. Interpreter ----------- Fixes bugs: - alloc_free sometimes incorrectly chose to put an unaligned block in an old segment on a freelist. - The default undercolor removal function returned its argument rather than returning 0. Adds NullEncode and SubFileDecode to the standard filters, since bdftops uses the latter. Adds RunLengthEncode and RunLengthDecode to the optional filters. Removes the type1imagepath operator. (It is still available as PostScript code, impath.ps.) Replaces it with a simpler outline tracing operator .imagepath. Adds 'const' in many places. Makes fileposition (but not setfileposition) legal for NullEncode filters. Changes the default transfer function for high-resolution devices from the identity function to the square root function. Moves array_get from zgeneric.c to iutil.c. Changes uses of fopen to add a "b" to the access mode, rather than relying on the _fmode global variable on MS-DOS platforms. Allows use of the -Z switch even when gsmain.c wasn't compiled with -DDEBUG, since other modules might have been. Reorganizes gs.c and gsmain.c so that the latter can be used in server environments. Replaces all uses of stdin/out/err with gs_stdin/out/err. Makes the number of permanent entries on the dictionary stack a parameter, to allow inserting globaldict in the future. Changes BlueShift in the Type 1 font Private dictionary to allow real numbers. (This differs from the Adobe specification, but at least one commercial font has a real number for BlueShift.) Library ------- Fixes bugs: - The doubling check in init_ht (gxht.c) still sometimes thought there was enough room to double the tile when there actually wasn't. - Rotated halftone screens didn't work. - gxarith.h used #ifdef vax, rather than #if !arch_floats_are_IEEE, to test whether IEEE floats were being used. - pathforall didn't report a trailing moveto. Replaces gs_type1imagepath with gs_imagepath. Allows sOUTPUTFILE=-, meaning output to stdout. Adds 'const' in many places. Replaces all uses of stdin/out/err with gs_stdin/out/err. Version 2.4.1 (4/21/92) ============= This is a quick release to fix minor problems discovered in 2.4, and to add a few improvements that didn't quite make it into 2.4. It also adds GIF and PCX file support. Procedures ---------- Fixes bugs: - Some makefile dependencies, and the ccgs script, caused trouble for parallel versions of `make'. - Compiling genarch with -O with gcc on the RS/6000 produced a buggy executable. Fixes some minor problems in make.doc. Adds DEVICE_DEVS2..5 to handle long device lists. Removes the need to set GS_RUN_EXE when using the Watcom compiler on MS-DOS systems. Gets rid of gs_ccfnt.ps, merging its function into gs_fonts.ps. Gets rid of gconfig.ps; this information is now compiled in gconfig.c. Utilities --------- Fixes bugs: - The palette for pstoppm in 8-bit mode didn't contain all 8 primary colors. - font2c used just values_ to mean &values_[0]; some compilers couldn't handle this. Makes font2c insert `const' in many appropriate places. Drivers ------- Fixes bugs: - The SunView driver had not been updated properly for 2.4 and was pretty thoroughly broken. - None of the printer drivers worked properly with the Watcom compiler, because stdprn was doing \n -> \r\n substitution. - If the generic printer driver couldn't allocate the requested size command list buffer, it gave up rather than trying to allocate a smaller buffer. - The SuperVGA drivers (except for the VESA driver) didn't work with the Watcom compiler, because a couple of places in the drivers weren't truncating the offset of "segmented" pointers properly. - Some of the H-P used <esc>*b#Y rather than <esc>*p+#Y for vertical positioning; this apparently is wrong, at least for the LJIIp. Removes the dependence of the X Windows driver on Xt, Xext, and Xmu. As a result, Ghostscript will not install a standard colormap itself, but it will use one if one is already installed. Adds a set of drivers for Portable Bitmap, Graymap, and Pixmap file formats. Adds drivers for monochrome, EGA/VGA-style, and SuperVGA-style PCX file formats. Adds drivers for monochrome and 256-color GIF file formats. Fonts ----- Adds ZapfChancery-MediumItalic as a copy of ZapfChancery-Oblique. Interpreter ----------- Fixes bugs: - A value with l_new set could 'escape' to save level 0 on a stack; if stored, it prevented the slot from being saved and restored properly. - 16#7fffffff + 1 gave the floating point equivalent of -2^31, not 2^31. - The PFBDecode filter computed the packet length incorrectly if the 0x8000-bit of the length was set. - 5-byte numbers in Type 1 CharStrings complained of a rangecheck if they exceeded 16 bits, rather than if they exceeded the integer part of a fixed. - (, ), and \ appearing in file name arguments in the command line did not work properly. Adds 'const' in many places. Changes the random number generator to be the same as the one used in Level 2 PostScript (as reported by Ed Taft on comp.lang.postscript). Exits with code 1 rather than code 0 on an unrecoverable error detected at the PostScript level. Makes dictionaries expand automatically when they fill up. Adds gp_exit to complement gp_init. Changes dictionaries to always allocate a power of 2 entries on 32-bit machines. Changes the name table to allocate indices scattered, so dictionary lookup doesn't have to do a multiply to scramble the index. Changes the handling of currentfile to do "shallow binding" so stack searching is almost never required. Library ------- Fixes bugs: - arc and arcn got a numeric exception if the radius was zero. - The undocumented 15 opcode in Type 1 fonts wasn't ignored. - PaintType 3 wasn't allowed. (It isn't clear what it should mean; we treat it as equivalent to 0.) - The VAX/VMS C compiler was generating incorrect code for the chi_bits and cmask macros in gdevmem, producing incorrect output. - If the result of the slow algorithm for intersecting clipping paths was a rectangle, the wrong thing happened (cbox didn't get set). - gx_path_is_rectangle didn't recognize open rectangles. - clist_change_tile didn't check properly whether the tile size had changed, so changing the screen could produce invalid band files. - The image operators did the wrong thing in the 1-for-1 case, interleaving N bytes of data with 7*N bytes of garbage. - stroke sometimes handled bevel and miter joins wrong in reflected coordinate systems. - init_ht checked incorrectly whether there was enough room to Y-replicate tiles, so sometimes it did it when it shouldn't have. - stroke sometimes thought lines were thin when they weren't. Adds 'const' in many places. Adds support for 2- and 4-bit-per-pixel memory devices. Version 2.4 (3/25/92) =========== This is a major release that adds SuperVGA support, support for Metrics, settable device properties, and incremental font loading. It also includes important performance improvements, based on rewrites of some key algorithms, and quite a few new Level 2 / Display PostScript facilities. Procedures ---------- Fixes bugs: - The rule for compiling gconfig.c didn't include the -I switches. - .bat files were being distributed with a \n line terminator rather than \r\n. - A CLOSE MODULE_LIST was needed after END_COMPILE: in the VMS command files. - Unix systems couldn't handle multiple drivers with overlapping sets of files. - -s<name> defined <name> as a null, rather than as an empty string. Adds gconfig.ps to the list of needed configuration files. Changes the way that the makefile handles nested .h files, so that it doesn't have to `touch' them. Adds the loadallfonts procedure to gs_fonts.ps. Changes the standard DOS configuration to include VGA, EGA, VESA, Epson, BubbleJet, and H-P printer drivers. Renames ghost.mak as gs.mak, and gdevs.mak as devs.mak. Adds a USE_ASM flag so that one can build a DOS version of Ghostscript without having an assembler. Splits off common code from the two MS-DOS makefiles into tccommon.mak. Replaces the COPYING and LICENSE files with a new LICENSE file containing version 2 of the GNU General Public License. Removes DEVICES and DEVICE_OBJS from the makefiles, since they are no longer needed. Adds a GS_DEVICE environment variable to supply a default device name if desired. Adds ansihead.mak and unix-ansi.mak, to parallel [g]cc-head.mak and unix-[g]cc.mak, for other ANSI C compilers. Changes the way that optional features are defined in the makefiles, so that they actually work. Adds support for the Watcom C/386 compiler. Allows # in the command line as equivalent to =, to compensate for brain-damaged MS-DOS shell. Adds -sOUTPUTFILE= to set the output file or pipe. Adds -dWRITESYSTEMDICT to leave systemdict writable. Utilities --------- Fixes bugs: - pcharstr.ps insisted on having Subrs be present in the font. - pcharstr.ps decoded negative numbers between -108 and -1131 incorrectly. - pfbtogs.ps didn't handle packets longer than 64K correctly. Changes the bdftops utility so that it makes entries for UnderlinePosition and UnderlineThickness in FontInfo, and so that it always records a FullName (the FontName if no other is provided). Changes the name of the pfbtops utility to pfbtogs, because groff already includes a program called pfbtops. Adds the gslp utility for doing "line printing" of text files, similar to enscript + lpr. Adds a new variable DITHERPPI that enables a different dither pattern, claimed to be better for printers. Adds the font2c utility for compiling Type 1 fonts into C, so they can be linked into an executable rather than loaded dynamically. Drivers ------- Fixes bugs: - gdev_prn_copy_scan_lines was erroneously masking the last byte of data even on color printers, as was paintjet_print_page. - The TruFax driver had a couple of compilation errors, since it hadn't been compiled in a while. - The BGI driver sometimes didn't consult BGIPATH when looking for .BGI files. - initclip did the wrong thing with memory devices. - The BGI driver didn't look in BGIDIR for .BGI files. - The Epson driver didn't set the right margin properly with ESC+Q. - The BJ-10e driver was badly broken. - gdev_prn_open/close_printer didn't reset the command list file, so it was taking quadratic time to print multi-page documents. Adds color to the SunView driver. Adds selectable resolution (75, 100, 150, or 300 DPI) to the DeskJet/LaserJet driver. Changes gssetdev so that drivers can specify special libraries to be loaded, as well as object files. Adds a driver for VESA-compliant SuperVGA displays. This driver handles all resolutions from 640 x 400 up to 1280 x 1024, in 256-color mode. The default is VGA resolution (640 x 480). Adds a driver for the ATI Wonder SuperVGA card, and for SuperVGA cards using the Tseng Labs ET3000 or ET4000 chip such as the STB VGA EM-16 and the Orchid ProDesigner II (256-color modes only). Adds a driver for Trident and Tseng Labs SuperVGA cards in 800 x 600, 16-color modes (for cards with only 256K of memory). Adds user-contributed drivers for the Ricoh 4081, DEC LN03, Canon LBP-8II, and H-P DeskJet 500C printers. Adds Tim Theisen's Ghostview changes to the X11 driver. MAKES NON-BACKWARD-COMPATIBLE CHANGES TO THE DRIVER PROCEDURE INTERFACE as follows: - Changes map_rgb_color and map_color_rgb to always work in a 16-bit color value space, rather than a space defined by the maximum number of distinct colors provided by the device. - Adds an argument to the output_page procedure to indicate whether the procedure is being called for copypage or showpage, and a num_copies argument. - Adds a gx_bitmap_id to the copy_ and tile_ procedures, so that drivers can cache bitmaps in the server or device if they want to. - Removes fill_trapezoid and tile_trapezoid. - Adds a new get_bits procedure for reading the bits back from the driver buffer (when possible), replacing copy_scan_lines. This procedure takes a new argument describing padding and byte swapping, and returns a different value from copy_scan_lines. - Adds get_props and put_props procedures for accessing arbitrary additional properties of devices. The interface is quite complex, but provides a great deal of flexibility. See drivers.doc for details. Changes gdev_mem_bytes_per_scan_line to gdev_prn_bytes_per_scan_line. Adds a user-contributed driver for DigiBoard, Inc.'s fax software. Fonts ----- Changes Type1BuildChar so it uses the information from the Metrics dictionary in the font, if Metrics is present. Changes findfont (.loadfont) so it recognizes .PFB fonts and can load them directly. Also changes .loadfont to disable packing temporarily, because some fonts rely on procedures being writable (!). Interpreter ----------- Fixes bugs: - The hypot function is not available on some Unix systems. - Ghostscript didn't flush and close files when exiting. - In statusdict, the /margins procedure used .leftmargin, but /setmargins used .lmargin. - An out-of-range putinterval would simply do nothing, rather than reporting an error. - If an attempt to allocate a block larger than the allocator's chunk size (20K) failed, the allocator would erroneously think it had succeeded. - The bind operator made the top-level procedure read-only, as well as interior procedures. - gs.c copied 1 extra character for the value of strings defined on the command line with -s...=, which could smash the first byte of the next object in memory. - copying a dictionary erroneously required the maxlength of the destination to be greater than or equal to the maxlength of the source, rather than the length of the source. - undef didn't correctly decide when to mark a deleted entry as deleted vs. free; as a result, some keys couldn't be looked up properly after an undef. - type1encrypt and type1decrypt didn't set the size of the result properly. - cvi and cvr didn't allow leading or trailing whitespace in strings. - cvs didn't cause an error if the destination string was too short. - Many operators didn't check correctly for stack underflow (off by 1). - `for' used reals, rather than integers, if the limit was a real, even if the initial value and increment were integers. - `restore' didn't properly invalidate copies of the save object being restored from; `save dup restore restore' would crash. - `restore' sometimes didn't undo stores into matrices that were stored into by operators. (The identity matrix always had l_new set.) - readline gave a rangecheck if the input line exactly filled the string. - `--' as the last switch on the command line caused a crash rather than an error message. - On MS-DOS systems, filenameforall didn't handle patterns with a drive or directory specifier properly. - stroke sometimes called gz_draw_line_fixed even if the line went outside the clipping box by 1 pixel. Changes the loop that binds procedure "operators" to entirely disable the handling of the typecheck error, rather than to use stopped. This cuts initialization time significantly, and also eliminates about 35K of wasted space (for saving the stacks). Changes the version "operator" so it returns 47.0. Adds "revision" to define the Ghostscript version # x 100. Adds gscurrentresolution and gssetresolution procedures for getting and setting the device resolution. Adds -r<res> and -r<xres>x<yres> as command line options for setting device resolution. Adds a facility for incrementally loading the individual CharStrings of a Ghostscript font from the disk. This can save a lot of memory, at the expense of slower rendering. (It is intended primarily for MS-DOS systems.) Changes findlibfile to return the name of the file that was actually opened, as well as the file itself, when the operation succeeds. Changes the name of the main entry to the interpreter from interpret to gs_interpret, because of a conflict with a Data General library procedure. Adds the .setmetrics operator to set the metrics for the current character for Type 1 fonts. Adds more LaserWriter-specific entries to statusdict. Gives names to all the internal `operators', so they will print out reasonably when an error occurs. Extends the status operator to accept a string and return file information, as defined for Level 2 PostScript. Adds the filter operator and some specific filters: ASCII85Encode, ASCII85Decode, ASCIIHexEncode, ASCIIHexDecode, eexecDecode, NullEncode, PFBDecode, and the null case of SubFileDecode. Extends the scanner to recognize the Level 2 << and >> tokens. Adds a facility for extracting the text strings from a PostScript file and writing them out in a simple format (selected by -dASCIIOUT, implemented by gs_2asc.ps). Implements all of the remaining Display PostScript facilities that are also in Level 2 (i.e., everything in section A.1.3 of the PostScript Language Reference Manual, Second Edition, that is not also in section A.1.2). The virtual memory operations are all stubs; the new halftone options are not fully implemented. Changes makeimagedevice to use a string of gray or RGB values, rather than an array of color objects, to specify the palette. Removes currentgscolor and setgscolor from the interpreter, but leaves t_color objects in, since they may be useful later. Adds getdeviceprops and putdeviceprops for manipulating device properties. Currently defined properties for all devices: InitialMatrix, HWResolution, HWSize, Name. Currently defined properties for printers: BufferSpace, MaxBitmap, OutputFile. OutputFile allows |command for piping on Unix systems. Removes deviceparams and makedevice. Adds devicedefaultmatrix. Implements reversepath. Makes copy work on devices. MS-DOS specific - - - - - - - - Fixes bugs: - iutilasm.asm wouldn't assemble with newer versions of MASM if CPU_TYPE was set to 286 or above. - CPU_TYPE=386 didn't properly substitute the faster multiply/divide routines under Turbo C++ or Borland C++, only under the original Turbo C. Library ------- Fixes bugs: - A curve whose first and last points were the same wouldn't get drawn at all. - A bug in the Turbo C++ compiler generated bad code when shifting a long right by 1 bit. - If stroking a dashed line ever encountered a segment that was completely blank, Ghostscript would indirect through a null pointer. - arc and arcn gave an error if the radius was negative. - stroke always used the general algorithm, even if the line was guaranteed to be thin. - arc and arcn erroneously reduced the angles mod 360. - Very large or negative 32-bit numbers in Type 1 fonts didn't work properly on MS-DOS systems (the ff0000 bits got set to zero). - Color printer devices rendering entirely in memory only allocated a monochrome-sized bitmap. - clip and eoclip didn't intersect the paths properly in the general case. - charpath erroneously rounded the current point to an integral value, causing characters to be spaced improperly. - The definition of max_color_param got some compilers confused. - charpath always used quadratic time and space, and dropped all but the last character when used with a Type 3 font. - Stroking a path with a 180 degree angle would incorrectly miter instead of beveling. - Type 1 fonts used the current flatness for curves, which could produce bad (and inconsistent) results. - Stroking a degenerate line segment produced incorrect results. Changes the character cache to use the UniqueID as the key, when available, instead of the font pointer. This dramatically improves performance when fonts are getting removed and reloaded because of page isolation with save/restore. Removes some unnecessary casts to (float) from gsmatrix.c and gscoord.c. Changes the Type 1 interpreter so that it rounds line and curve endpoints to the center of the nearest half-pixel, and omits null line segments. This both speeds up rendering at small sizes and improves output quality. Changes gs_deviceparams to return resolution as well as extent; changes gs_makedevice to accept resolution as well as extent. Replaces the algorithm for approximating circular arcs with curves with a more accurate one. Changes gs_point and gs_rect to use doubles rather than floats. Adds gs_setmetrics, for overriding Type 1 font metrics for the current character. Changes clipping to use lists of rectangles rather than path intersection. This makes a big difference when clipping bitmaps (including characters). Changes the character cache to discard entries incrementally, rather than clearing the entire cache when it fills up. Changes the implementation of transfer functions to use a cached map, built when the transfer function is set. This makes transfer functions work properly in all situations, including images. Defines a .quit operator that takes an exit code, and redefines quit in terms of it. Adds support for 16-bit-per-pixel devices in gdevmem. Adds gs_copydevice and gs_deviceinitialmatrix; removes gs_deviceparams and gs_makedevice. Changes setscreen to ensure that the cell is always at least 4x4 pixels in size. Version 2.3 (8/28/91) =========== This is a minor release to fix two bugs and add the PaintJet driver, which didn't make it into 2.2. Utilities --------- Changes the pstoppm utility so it counts pages correctly even in the presence of arbitrary saves and restores. Drivers ------- Adds a new, "supported" PaintJet driver. Changes the Epson driver to use ESC+D rather than ESC+\ for horizontal positioning, since many printers don't support the latter. Adds horizontal double-density (two-pass) printing to the Epson driver, so it can do 240 x 60 and 360 x 180 densities. (Vertical double density is not supported yet.) Version 2.2 (6/1/91) =========== The purpose of this release is to add save/restore, and a few miscellaneous Level 2 P*stScr*pt features such as undef. It also includes major improvements in graphics quality and in handling of high-resolution printers. Procedures ---------- Changes the version numbering to M.mpp rather than M.m.p, so that `version' can be a real number for those programs that insist on it. Renames ghost.ps as gs_init.ps, gfonts.ps as gs_fonts.ps, and statusd.ps as gs_statd.ps. The initialization files now all are named gs_*.ps. Renames gdevs.{c,h,tl} as gconfig.{c,h,tl}. Changes the relevant makefiles and command files so that a single build can contain several drivers that share code, e.g., the Epson driver and the DeskJet driver. Changes gs_init.ps so it relies on an external gconfig.ps file rather than making a specific test for the presence of Level 2 features. Adds an entry for uglyr.gsf to the makefile. Removes the distinction between CCA and CCNA, since most of the files now contain constructs that require non-ANSI compilation on MS-DOS platforms. Adds a `man' page for the ansi2knr utility. Changes the documentation (use.doc) to show how to use -sDEVICE=<device>, or the selectdevice procedure, to select devices by name. Adds DEVICE_DEVS to the makefiles (analogous to DEVICES and DEVICE_OBJS). This finally makes the make procedure fully automatic. Adds the name of the initialization file (gs_init.ps) as a platform-specific makefile parameter, GS_INIT. Removes the test program gt.{c,tr} from the fileset, since it is not useful to users. Moves the Symbol encoding vector to a separate file (symbol_e.ps), from which it is loaded when first used. Changes the error handler so it can handle errors that occur while reading the initialization files. Extends ansi2knr so it can handle `void' and `...' in parameter lists. Adds quit.ps to the set of installed files. MS-DOS-specific changes - - - - - - - - - - - - Adds the VGA and BGI drivers to the standard MS-DOS configuration, and makes VGA the default. Adds a `+' and a newline at the end of gs.tr, to avoid problems with file transfer programs or editors that add a newline at the end of files. Changes the name of msdos.mak to turboc.mak, and creates a new tbcplus.mak makefile for use with Turbo C++ and Borland C++. Changes the extension of the loader response files from .tl to .tr. Changes the default search path from c:/ghost and c:/ghost/fonts to c:/gs and c:/gs/fonts. Changes the directory separator from `|' back to ';', since it appears that DOS can handle a ; in a command line if it is prefixed with \. Unix-specific changes - - - - - - - - - - - Changes the uses of install in unixtail.mak so they only install a single file at a time, which is all that the standard Unix install allows. Removes the duplicate files (README/readme, LICENSE/license, COPYING/copying, Fontmap/fontmap). Changes the ld flags from LDPLAT to LDFLAGS. Adds XCFLAGS and XLDFLAGS. These are concatenated with CFLAGS and LDFLAGS respectively. The intention is that they be set from the `make' command line if desired. VMS-specific changes - - - - - - - - - - Repairs the omission of ZPACKED from the VMS build lists. Drivers ------- Fixes bugs: - The SunView driver produced semi-garbage on little-endian platforms (Sun-386i) because it didn't swap the bit order. - The X driver would dump core if it couldn't open the display and the DISPLAY environment variable wasn't set. - The X driver relied on white = 0, black = ones in a couple of places; - The X driver would return an error, instead of clipping, if asked to display outside the window. - The X driver would create inappropriately sized windows, because it believed the server's report of the screen resolution. Adds Fran Taylor's Private Eye driver to gdevs.mak and the fileset (not supported by Aladdin Enterprises). Adds Neil Ostroff's TruFax driver to gdevs.mak and the fileset (not supported by Aladdin Enterprises). Makes the scratch file template for the printer drivers a per-platform quantity (gp_scratch_file_name_template). Puts the default scratch files for Unix in /usr/tmp rather than /tmp. Changes the SunView driver to prevent the Ghostscript window from being destroyed (which badly confuses the interpreter). Extends the Epson driver to handle a variety of print densities in both X and Y, to handle 24-pin as well as 8-pin graphics, and to allow optional specification of default density in the makefile (gdevs.mak). Refactors the printer drivers so that a single driver handles both DeskJet and LaserJet. Adds LaserJet drivers that use the new compression modes on the LJ IId/IIp and LJ III. Changes all the printer drivers to use band lists rather than bitmap paging as the buffering method. (The individual drivers need only a one-line change to replace mem_copy_scan_lines with gdev_prn_copy_scan_lines with a different argument.) Adds the halftone phase as additional arguments to tile_rectangle and tile_trapezoid. Adds an entirely new and much simpler PaintJet driver, using the new band list interface. Adds margin information to the device structure. This is currently only relevant for printer devices. Adds BGIPATH and BGIUSER environment variables, allowing additional control of the BGI driver. Changes the x/y_pixels_per_inch member of the device structure from int to float. Fonts ----- Patches gs_fonts.ps so definefont will add an isFixedPitch entry to FontInfo if there isn't one there. Removes the old "type 7 path" encoding code from gs_fonts.ps. Changes bdftops so it puts isFixedWidth and ItalicAngle entries in the FontInfo dictionary of the fonts it creates, since some P*stScr*pt programs rely on this. Changes bdftops so it synthesizes as many missing characters as possible out of the ones that are there (in particular: synthesizes accents out of punctuation marks, and accented characters using seac.) The results aren't all that good, but they're a lot better than having characters missing out of the font. Utilities --------- Adds a pfbtops utility for converting .PFB fonts to standard Ghostscript fonts. Fixes bugs: - ps2image didn't reset things properly between pages for multi-page documents. Interpreter ----------- Makes Ghostscript recognize `-' alone as meaning that it should read from standard input as though it were a file. This allows Ghostscript to accept a pipe as input. Fixes bugs: - seac in type1addpath used the current font's encoding, not StandardEncoding. - type1decryptfile (eexec) didn't recognize binary (as opposed to hex) representation. - Mentioning a name whose value was a no-access object caused an invalidaccess error. - There was a bogus definition of `run' in zfile.c. - The interpreter didn't handle end-of-file on stdin properly. - Real numbers with an 'e' or 'E' but no decimal point were not recognized. - On MS-DOS systems, inside strings, \ followed by a newline was not discarded properly. - On MS-DOS systems, the long unsigned divide routine sometimes gave incorrect answers. Among other things, this caused alternate-radix numbers sometimes to crash the interpreter. - cvrs didn't do the right thing about reals or negative integers. - .echo.mode was being reset with def instead of store, and was defined in systemdict rather than userdict. - setgray and settransfer didn't interact properly. - 16#80000000 was being interpreted as a signed integer (and converted to a real) rather than an unsigned one. - atan returned 0 sometimes when it should have returned 180. - currentcmykcolor was defined wrong. Removes the filename operator, since no standard Ghostscript code used it, and it caused problems with some P*stScr*pt files. Implements new operators: filenameforall, selectfont (as a procedure), stringmatch, undef. Adds new standard procedures: selectdevice. For MS-DOS, requires that the operand and execution stacks be located in the data segment, and uses short pointers to address them. This produces significantly smaller and faster code. (These changes are not visible to users or library clients.) Changes the assignment of attribute bits, and adds new bits for save/restore and the garbage collector. Changes many of the macros in store.h to support save/restore. (These changes are not visible to users or library clients.) Implements save and restore. Moves type names from gs_init.ps to ghost.h and ztype.c. Moves error names from gs_init.ps to errors.h and iinit.c. Introduces gp.h as a documented interface to the platform-specific files. Adds the -- switch, which allows Ghostscript programs to take arguments from the command line. Changes many uses of the name `name' to something else, to avoid upsetting the Microsoft C compiler. Really implements packed arrays -- they took the same amount of space as ordinary arrays in previous versions. Changes exitserver in serverdict so that it just clears the stacks. (This isn't the correct fix, but it will do as a workaround.) Makes many miscellaneous small changes to pacify various compilers. Changes gs_fonts.ps so that when "quiet" mode is selected (-q switch), Ghostscript doesn't print anything when loading fonts or when substituting for undefined characters. Defines the name consisting of just a control-D as a no-op, because some P*stScr*pt-generating applications put control-Ds in their output. Implements halftone phase (sethalftonephase and currenthalftonephase operators). Removes the -E switch, since it is no longer useful. Changes the -w and -h switches to a single -g (geometry) switch, with usage -g<width>x<height>. Makes the -h switch, and a new -? switch, print usage help. Implements correct handling of stack overflow errors (makes an array out of the contents of the overflowing stack, and resets the stack, before invoking the error handler). Adds t_oparray (`operators' defined as procedures) and the makeoperator operator. This is so that programs like the Distillery that rely on all operators being bound by `bind' will work properly. Adds a new NOPAUSE flag to suppress the prompt and pause at copypage and showpage. Library ------- Fixes bugs: - gs_type1_interpret didn't store the encryption state or the skip count before returning to let the client handle a seac or an endchar in the middle of a seac. - The definition of the Type 1 operator ce_testadd was based on wrong information; the operator takes only 2 operands and does something unknown. - mem_true24_copy_mono wasn't incrementing the destination pointer if the color was transparent, leading to garbled characters. - gx_lookup_fm_pair would sometimes look at one entry beyond the end of the cached font/matrix pair area. (This probably had no practical effect.) - gs_type1_interpret didn't save the current point when returning to the client for a callothersubr, causing some characters to be rendered displaced (such as some of the chess pieces in chess.ps). - gs_setgray, gs_sethsbcolor, gs_setrgbcolor, gs_setflat, and gs_setlinewidth gave errors for out-of-range operands rather than forcing them into range. - Transfer functions were not actually supported. - The area fill algorithm failed on certain complex paths. - The current point was sometimes defined when a BuildChar procedure was called. - Stroking a degenerate line didn't display anything for round caps or joins. - If the ends of a curve had exactly the same X coordinate, the curve sometimes wouldn't be displayed. - Very thin lines that went outside the clipping region would sometimes be displayed as dashed, or not at all. - The translation in a FontMatrix was ignored. - Very wide, shallow lines would color extraneous pixels when using bevel or miter joins. - Dashed lines didn't join properly at the beginning of a closed path. - 0-degree arcs didn't add the appropriate line (possibly degenerate) to the path. - gs_type1_interpret didn't reset the callsubr stack when starting the base character of a seac, which caused confusion if the accent's endchar fell inside a Subr. - Non-monochrome memory memory devices weren't checking the arguments of the drawing procedures properly. - The initial clipping rectangle for memory devices was being computed wrong. - Null devices had a semi-infinite clipping rectangle instead of an empty one. - gs_setlinewidth was treating negative arguments as zero, instead of taking the absolute value. - imagemask with a dithered color used a solid color rather than the dithered one. Tweaks the area fill and image rendering algorithms to be a little more liberal with paint when being used to render characters. Changes the name of the 8-bit mapped color memory device from mem_mapped_color_device to mem_mapped8_color_device. Changes the memory devices so that on little-endian platforms, they can store the bytes within a word in either order. (Little-endian order allows efficient 32-bit updating, big-endian is required when displaying or writing to a printer or a file.) Implements halftone phase. Replaces the trapezoid fill algorithm with a much more accurate one inspired by a contribution from Paul Haeberli. This also changes the graphics convention back to filling only pixels whose center falls within the region to be filled. Changes the character cache to allocate headers and bits contiguously out of a single ring buffer. Changes gs_imagemask and gs_imagemask_init to take a thickness adjustment parameter. Changes gs_setcachedevice and gs_setcharwidth to take the graphics state as a parameter. Renames gx_device_memory_bitmap_size as gdev_mem_bitmap_size, mem_copy_scan_lines as gdev_mem_copy_scan_lines, and mem_bytes_per_scan_line as gdev_mem_bytes_per_scan_line. Version 2.1.1 (1/15/91) ============= This is a sub-release distributed to fix a few early bugs in 2.1, just in time for the new GNU master tape. Build procedures ---------------- Removes all of the (undebugged) Level 2 code from the fileset, as well as the (unused) file gdevvga.c. Changes the tar file so that the files are stored in the directory gs<version> rather than simply gs, e.g., gs211. Interpreter ----------- Changes the scanner so that \ is recognized within strings regardless of whether the scanner is reading from a string or from a file. This is compatible with newer P*stScr*pt interpreters, and with the newer P*stSc*pt language specification, but not with the older specification in the original PostScript Language Reference Manual. Drivers ------- Fixes the max_value macro in gdevmem.c so that compilers won't complain about a left shift by 32. Adds 'byte' to the list of types that gdevx.c must sidestep because header files use them. Library ------- Changes the computation of penum->unpack in gsimage.c so as not to upset compilers that don't treat procedures and pointers to procedures as compatible types for conditional expressions. Version 2.1 (12/31/90) =========== This is primarily a bug fix release to clean up problems in 2.0. It also implements a first cut at the new color operators. Build procedures ---------------- Changes the separator for multiple directories in MS-DOS from ';' to '|', since there is no way to include a ';' in a command line. Adds <dir>/fonts to the default search path, where <dir> is c:/ghost for MS-DOS systems and `pwd` for Unix systems. Adds new documentation describing how to direct output to the printer. Changes the PROCTYPE and USE8087 options in MSDOS.MAK to CPU_TYPE and FPU_TYPE. The latter now indicates the type of FPU to generate code for, if any. Drivers ------- Adds a driver for the Canon BubbleJet BJ10e. Modifies the EGA driver to handle (non-standard) frame buffers larger than 64K. Adds drivers for the VGA and for the EIZO MDB-10 (a 1024 x 768 frame buffer). Changes the X driver so that it clips to the window dimensions, rather than reporting an error. Notes that the H-P LaserJet driver, like the DeskJet driver, works under Unix as well as MS-DOS. Adds support for 120 X DPI mode, and for the LQ-1500, to the Epson driver. Fonts ----- Fixes bugs in bdftops: - It was using /UniqueId instead of /UniqueID as the key for the font unique ID. This effectively disabled the font cache. - The definition for .notdef was bogus -- an invalid CharString. Changes ghost.ps and gfonts.ps so that NullFont is the initial font, rather than Ugly. Arranges things so that when attempting a font substitution, if the default font is not found, NullFont is used instead. Extends bdftops so that if certain easily synthesized characters are missing from a font, it will attempt to synthesize them using available characters. Interpreter ----------- Extends the -T switch to allow specifying a printf template for the arguments of the procedure being traced. Fixes bugs: - /0 was interpreted as equivalent to 0 (a number) rather than a literal name. - packedarray was defined as being like array, instead of like array followed by astore. - Many minor and harmless type mismatches (and a couple of very minor genuine bugs) were upsetting the Apollo C compiler. - exp was incorrectly failing in certain cases with a negative first argument. - copyscanlines incorrectly required at least 4 elements on the operand stack, although it correctly only used the top 3. - readhexstring incorrectly read 1 byte even if the string length was zero. - Not every place that expected an array would accept a packed array. - Very complex paths (and infrequently other things) could produce a 'memory leak'. - / alone would skip following whitespace and gather following characters, rather than creating an empty name. - ghost.ps left newerror defined as true in $error, which resulted in an erroneous error report if a program executed a 'stop'. - The definition of exitserver in serverdict didn't clear the stack. - currentfile returned an executable file, rather than a literal one. - setfont for Type 1 fonts didn't check the UniqueID in the font dictionary against the one in the font's Private dictionary. - A value stored in a dictionary under the key /xxx couldn't be retrieved using the key (xxx), and vice versa. - charpath with a Type 1 font on a string containing a 'space' would produce garbage (it released the parent path inappropriately). - bytesavailable did not work properly for terminal input. Changes the interface to the memory allocator so that it always takes an element size and an element count, like calloc instead of malloc (but note that alloc does *not* clear just-allocated blocks). Gets rid of the special 'dynamic' allocation procedures. Changes the random number operators to use a better implementation. Changes the idiv operator so it will accept any numbers, not just integers, as arguments. (The PostScript manual doesn't allow this, but implementations apparently do.) Provides semi-fake but usable definitions for all of the color PostScript extensions, including a real implementation of colorimage. No longer uses the name 'null', which is apparently reserved by Microsoft C. Makes a number of other minor changes required to pacify the Microsoft C compiler. Implements %statementedit and %lineedit. (%statementedit is equivalent to %lineedit, which is wrong.) Changes the interactive interpreter to use %statementedit. Changes the scanner to accept null, ctrl-K (vertical tab), and ctrl-L (form feed) as whitespace. Ctrl-L terminates a comment, null and ctrl-K do not. Allows a literal string as the 'proc' argument(s) for image, imagemask, and colorimage. Adds the following operators/procedures: arct, cleardictstack, deletefile, renamefile. Defines =print as a synonym for =, for the benefit of LaserPrep. Implements non-zero PaintType for the show operators (but not for charpath) for Type 1 fonts. Adds the ISOLatin1Encoding encoding vector. Renames currentcolor and setcolor as currentgscolor and setgscolor, to avoid conflict with the Level 2 PostScript names. Removes colorhsb, colorrgb, hsbcolor, and rgbcolor. Library ------- Fixes bugs: - In a couple of places, a 0 was being passed as a pointer argument without casting, which confused the Microsoft C compiler. - Image devices were not recognized properly in debugging configurations. - Inverted-color monochrome image devices were not recognized properly. - Images that exactly fill the drawing area rendered very slowly, because they erroneously used the general clipping algorithm. - Images that are 1-for-1 with the device were incorrectly scaled by a factor of 8 in X. - Rounding artifacts sometimes caused characters to be unevenly offset vertically by 1 pixel. - Type 1 fonts that used the Flex feature resulted in garbled images. - The show operator routines would incorrectly fill or stroke a path that existed at the time the show was started. - setscreen truncated the cell size instead of rounding, which could produce off-by-1 anomalies. - stroke would sometimes produce garbage (or nothing at all) for very narrow lines. - path filling would only color the pixels whose centers fell inside the path: the Adobe specification requires coloring a pixel if any part of it falls inside the path. Changes the Epson printer driver so that it drives the printer directly rather than writing to a file. Changes pathbbox so that if the path is empty but there is a current point, it returns a null rectangle at the current point. Changes gs_image_init to take an additional parameter (after bps) giving the number of samples per pixel (1, 3, or 4), and an indication of whether the samples for each pixel are together or separated (-3 or -4). Renames the gs_image_data and gs_imagemask_data procedures as gs_image and gs_imagemask, and removes the old versions of the latter. Adds gs_colorimage. Replaces Snoopy's color dithering algorithm with one contributed by Paul Haeberli. Changes gs_setgray, gs_[set]hsbcolor, and gs_[set]rgbcolor so that they coerce arguments outside the range [0..1] back into the range, instead of signalling an error. Makes a number of minor changes required to pacify the Microsoft C compiler. Changes gs_arcto so that if the last argument is a null pointer, the tangent points are not returned. Removes gs_type1addpath, which is not useful. (Clients must call gs_type1_init and gs_type1_interpret directly.) Implements the 'seac' opcode for Type 1 fonts, allowing fonts with accented characters to display properly. Implements the undocumented 'testadd' opcode for Type 1 fonts, which is used by some Adobe fonts. Renames gs_currentcolor and gs_setcolor as gs_currentgscolor and gs_setgscolor. Removes gs_colorhsb, gs_colorrgb, gs_hsbcolor, and gs_rgbcolor. Version 2.0 (9/12/90) =========== The main purpose of this release is to add fonts, support for multiple devices, and imaging into memory. It also fixes a number of miscellaneous bugs. (Unfortunately, accurate records of the bugs fixed are not available.) The changes were so extensive that we chose to increment the major version number. Miscellaneous ------------- Doesn't attempt to open the .MAP file on Unix systems. Adds mention of statusd.ps to interp.doc. Notes that Turbo C 2.0, not 1.5, is required for building the MS-DOS version. Adds a DEVICES= line to the makefile, and allows multiple devices. Documents, in interp.doc, the X Windows resources that Ghostscript recognizes. Adds three PostScript masters to the fileset: chess.ps (+ cheq.ps), golfer.ps, and escher.ps. Drivers ------- Changes the names of all the device drivers. See gdevs.mak for the updated list. Adds a (working) driver for SunView. Adds drivers for the Sony NeWS frame buffer, and the Sony Microsystems NWP533 printers. These drivers were contributed by users, so we aren't prepared to answer questions about them. Adds a driver for the Borland Graphics Interface (BGI) for MS-DOS systems. Note that to use this driver with a non-EGA/VGA display, you need a .BGI file appropriate for your hardware. (The Ghostscript executable includes the EGA/VGA driver.) Adds a driver for Epson printers. The driver has only been tested on an LX-800, and on an H-P DeskJet in FX-80 emulation mode, but may work on other models. The driver could be adapted to work on Unix systems, but as distributed, it only works on MS-DOS systems. Adds a driver for the Hewlett-Packard DeskJet printer. The driver could be adapted to work on Unix systems, but as distributed, it only works on MS-DOS systems. The X Windows driver no longer waits for the user to type a character before bringing up the initial display. Adds information to drivers.doc describing how to change the definition of the device structure and procedure table. Extends the tile_rectangle and tile_trapezoid driver procedures to interpret color0 = color1 = gx_no_color_index as meaning that the tile is actually colored, not a mask. Build procedures ---------------- Changes the tar file so it puts everything in a directory called gs. Removes the -ansi switch for gcc (this was causing problems with <math.h> on some systems). Changes LDPLAT to the string -X, which is appropriate for most Unix systems (but not for SunOS 4.n). Adds EXTRALIBS to the makefile, for specifying additional libraries to be linked in. Adds a 'clean' target for 'make', to get rid of all temporary files, the binaries, and the executable. Changes names of system-specific files from gp-xxx.c to gp_xxx.c. Adds support for VMS (gp_vms.c and ghost.dcl). Creates a new file gdevs.mak, and reorganizes the other makefiles, so that the choice of which device driver(s) to include is isolated in a single line in the platform-specific makefile. Changes the standard MS-DOS makefile so it builds for 8088/86 (not 80386), with neither -DNOPRIVATE nor -DDEBUG. Changes the name of the MS-DOS makefile from dos-ega.mak to msdos.mak, and the Unix makefiles from ux-[g]cc-x.mak to unix-[g]cc.mak. Updates drivers.doc to describe how to add new drivers in gdevs.mak. Removes gdevs.ps: the drivers are now responsible for specifying the size of the imaging region. Interpreter ----------- Adds a makefile macro GS_LIB_DEFAULT and an environment variable GS_LIB to define a search path for the library (initialization and font) files, and implements the -I switch for the same purpose (replacing -sLIB=, which was never actually implemented). See interp.doc for details. No longer clears the operand stack between interactive inputs. No longer prints the contents of the operand stack after every input in debug mode. Doesn't "eat" the character that the user types to proceed after a showpage, unless it's an isolated <return>. Changes the prompt so that it says GS> if the operand stack is empty, or GS<n> if there are n > 0 elements on the operand stack. Adds -w and -h switches to the command line, equivalent to -dWIDTH= and -dHEIGHT= except that they require numeric arguments. Adds -q (quiet startup) switch to the command line, which suppresses some initial messages and also has an effect equivalent to -dQUIET. Fixes bugs: - = and == caused an error on some kinds of objects if the object didn't have read access. - cvs didn't print operator names. - The definition of dynamic_begin in iscan.c caused the DEC VMS C compiler to produce incorrect code. - mul didn't return a correct (real) result when multiplying a very large integer by an integer that wasn't very large. - eq and ne didn't work on files, fonts, save objects, and some operators. - The scanner would sometimes blow up on floating point numbers beginning with a '.'. - flushfile didn't pop its argument from the stack. - put and putinterval would store into a packed array. - a few operators didn't check properly for stack underflow. - cvrs produced wrong output for radix values greater than 10. - The scanner would convert upper-case letters in alternate-radix numbers wrong on Unix systems. - String comparisons other than equality often produced the wrong result if the strings were of different lengths. - An ifelse as the last thing inside a forall would confuse the execution stack. - There were some omitted casts and 'private' declarations that made the GNU compiler unhappy. - There was a memory leak in the image[mask] operators that caused 516 bytes to be permanently lost each time one of them was used. - Quoted strings of length greater than 50 and less than 100 would get mangled when being read in. - The scanner didn't consume the whitespace character following a token, so programs that read data out of the program file could get confused. - Under rare circumstances, an object of size between 249 and 255 bytes could get allocated on top of another object. Allows bind to bind packed arrays, even though they aren't normally writable. Changes the length operator to allow a name as the argument. (The PostScript manual doesn't allow this, but implementations apparently do.) Changes the setcachedevice operator to allow the bounding box to be specified as a 4-element array instead of 4 scalars. (The PostScript manual doesn't allow this, but implementations apparently do.) Removes a line from ghost.ps that accidentally disabled the font cache. Implements memory devices (makeimagedevice, copyscanlines, and makedevice for image devices). makeimagedevice is implemented only for 1, 8, 24, and 32 bits per pixel. Changes the deviceparams operator so it pushes a mark on the stack below the parameters. This is to allow for devices that have more than the standard set of parameters. Replaces defaultdevicename with two new operators, getdevice and devicename. Adds a flushpage operator that flushes any outstanding buffered output to the screen. This is not the same as copypage: on printers, copypage actually prints a page, whereas flushpage may do nothing; on displays, flushpage and copypage may both flush output to a server. Adds an unread operator for pushing back a character into a file. Adds a description of proposed grayimage and colorimage operators to ghost.doc, even though they aren't implemented yet. Changes the name of the currentfileposition operator to fileposition. Removes the framedevice operator, since the new device operators supersede it. Adds a writeppmfile operator, for writing the contents of a memory device to a ppm file. Makes Ghostscript work even when the >> operator doesn't sign-extend negative numbers. (This has not been tested.) Adds the Symbol encoding to ghost.ps. Adds two new file-related operators, filename and findlibfile. See ghost.doc and interp.doc for details. Adds type1encrypt and type1decrypt operators for manipulating Adobe Type 1 encoded fonts. Changes the imagecharpath and addcharpath operators to type1imagepath and type1addpath. These operators now work with the Adobe Type 1 font encoding. Adds the type1decryptfile operator for reading Adobe Type 1 encrypted fonts. Library ------- Fixes bugs: - curveto and lineto didn't check for the current point being defined. - stringwidth would fail if there was no current point. - There were omitted casts that made the GNU compiler unhappy. - Line caps and joins didn't always work. - Dashed lines didn't work at all. - If you read out the current matrix while inside a BuildChar procedure, the result was garbage. - image[mask] would crash if you gave it a single string with more than 64K-1 pixels (MS-DOS only). - Filling with a gray pattern sometimes wrote into pixels beyond the right edge of the region (MS-DOS only). - The font cache would mistake fonts for each other if both fonts had a default (unsupplied) "unique ID". - When a character was entered into the font cache for the first time, sometimes it would display as garbage and/or displaced vertically from its proper position. Implements gs_makeimagedevice, gs_copyscanlines, gs_getdevice, gs_devicename, gs_flushpage, gs_writeppmfile, gs_type1encrypt, gs_type1decrypt, gs_type1imagepath, and gs_type1addpath procedures corresponding to the new operators in the interpreter (see preceding section). Changes [gs_]setdevice so that it does an erasepage when it first opens the device. Changes definition of gx_device structure as follows. NOTE: THIS AFFECTS ALL DRIVERS. - Removes bits_from_MSB (which wasn't actually used, in any case). Ghostscript now assumes officially, as it always did in practice, that device bitmaps are stored MSB first, i.e., X=0 corresponds to the 0x80 bit in the first byte. - Removes the initial_matrix member, which wasn't actually being set up. - Adds a new member 'name', a string giving the device name. - Adds new members 'x_pixels_per_inch' and 'y_pixels_per_inch'. These are only used by the default initial_matrix procedure (see below). - Adds a new procedure 'output_page'. The default implementation (gx_default_output_page) just calls the sync_output procedure. - Adds a new procedure 'get_initial_matrix'. The default procedure uses the width, height, and x/y_pixels_per_inch members to compute the matrix, assuming that X values run from right to left, and Y values run from top to bottom. Changes the names of the allocation procedure types gs_proc_alloc and gs_proc_free to proc_alloc_t and proc_free_t, and moves them from gs.h to std.h. Makes Ghostscript work even when the >> operator doesn't sign-extend negative numbers. (This has not been tested.) Version 1.3 (6/20/89) =========== This release should have had a lot more things in it, but time pressure and the already long delay in getting it out made it necessary to push it out the door in an incomplete state (e.g., no testing on X systems whatsoever). Interpreter ----------- Makes -d and -D equivalent on the command line. Adds a new switch -s / -S that defines a name as a string rather than a token. Arranges things so that if -sLIB=_a_prefix_ is defined on the command line, (filename) run will look for _a_prefix_filename before giving up if filename isn't the name of an accessible file. Changes showpage from an operator to a procedure. The definition of showpage in ghost.ps does a copypage, beeps the console, waits for the user to type a character (normally a <return>, since line buffering is always enabled), and then does an erasepage and an initgraphics. Adds a new initialization file, gdevs.ps, containing device-dependent parameters. The default window size for X Windows is properly set to 612 x 792, i.e., 8.5" x 11". Adds a new optional initialization file, statusd.ps, that provides dummy definitions for the names found in statusdict on LaserWriters. Adds a new operator, getenv, to get information from the shell environment. Adds a new predefined operator, defaultdevicename, that returns either (X) or (EGA) according to how the interpreter was built. Adds a new type, devicetype, and new operators deviceparams, getscanlines, makedevice, makeimagedevice, and setdevice. Changes currentdevice to return a device object rather than a set of parameters. Makes the scanner recognize reals with 'e' exponent notation, and handle reals with more than 9 digits. Fixes a bug that made names starting with digits read incorrectly. Fixes a bug in the exp operator that made it not pop its first argument from the stack. Fixes a bug in the rand operator that made it return negative values about half the time. Fixes a bug in equality comparison (eq, ne, and several other operators) that made unequal operator objects occasionally appear to be equal on DOS systems. Fixes a bug in the bind operator that made it not work on packed arrays. Changes the internal representation of dictionaries so they can be expanded or contracted dynamically. Adds a new operator, setmaxlength, to change the allocated size of a dictionary. Changes sstorei.h so that non-DOS compilers don't encounter the #pragma directive used by Turbo C. Restores the display mode (on MS-DOS systems) when exiting. Fonts ----- Makes undefined characters in the standard font display as tilde rather than blank (or causing an error). Unmapped character codes (those mapped to .notdef in the encoding) still display as nothing, per the PostScript manual. Library ------- Adds a new header file, gxbitmap.h, with some new documentation describing the internal storage format for bitmaps. Makes numerous internal changes in the character / font cache, affecting many of the routines in gxcache.c. Fixes a bug in gz_draw_line / gz_fill_trapezoid that made nearly horizontal lines display wrong. Fixes a bug in gs_scale that made scaling not work if the coordinate system was rotated or skewed. Extends the font cache so it will handle characters rotated by multiples of 90 degrees. Changes the second argument of gx_path_bbox and gx_path_is_rectangle to be a gs_fixed_rect * rather than a fixed [4]. Changes gs_matrix_rotate so it handles multiples of 90 degrees as a special case. Changes the definition of the gx_device structure to accommodate the new device operators, and adds corresponding library calls. Changes the type for a device color index from int to gx_color_index (equivalent to unsigned long). ***NOTE***: this affects existing clients and drivers in a non-trivial way on MS-DOS systems. Changes gs_malloc and gs_free to take a client name string as an argument. Usage procedures ---------------- Changes the compilation rules for Unix systems to not use the -o and -c compiler flags together, to be compatible with more versions of cc. Changes the gcc makefile to use $(GCC) rather than gcc as the compiler name. Moves the -1 flag for the MS-DOS compiler from the cc*.bat files to the makefile. Changes CCDEBUG to CCFLAGS, and adds ASMFLAGS, in DOS makefile. Adds -DFOR80386 and /DFOR80386 to enable use of 80386 instructions in assembly code on DOS systems. Merges the DEBUG and gs_DEBUG switches. There is now only a single DEBUG switch that affects both the interpreter and the library. Adds a new compilation switch, -DNOPRIVATE, that makes private (static) variables and procedures public for debugging and profiling (only needed on DOS systems). Adds the DOS executable (gs.exe and gs.map) to the distribution fileset. Adds new platform-specific code files, gp-*.c, for a few things like reading the clock. Adds a new documentation file, drivers.doc, that describes the interface between Ghostscript and device drivers. Version 1.2 (2/22/89) =========== Interpreter ----------- Adds the new facilities in version 25 of PostScript: //name for immediate lookup, packed arrays (setpacking, currentpacking, packedarray operators), and new font cache parameters (setcacheparams, currentcacheparams operators). Adds new operators (setfileposition, currentfileposition) for random access to files. Extends readhexstring to take either a string or a file, just like token. Fixes a bug that caused the 'for' operator (and a couple of others) to randomly smash memory locations on PC platforms. Library ------- Renames the init_device driver procedure as open_device, and adds a corresponding close_device. Adds new procedures to read and set the cache limit values (implementing the currentcacheparams and setcacheparams operators). Usage procedures ---------------- Changes the name of the Unix makefile to ux-cc-x.mak, and adds a new Unix makefile, ux-gcc-x.mak, for using gcc instead of cc. (The latter doesn't actually work yet.) Changes the name of the single built-in font from uglyfont.cp to ugly10.cp. Version 1.1 (2/12/89) =========== Interpreter ----------- Makes the scanner treat ^Z (ASCII code 26) as whitespace: it erroneously treated ^R (ASCII code 22, or octal 26) as whitespace. Makes the token and readline operators, and the syntax for comments, recognize \r (code 13), \n (code 10), and \r\n as equivalent end-of-line indicators. The token and readline operators will skip over any of these sequences at the end of a token or line respectively, and a comment will read through any of these sequences. The other file operators (read, write, readstring, writestring) do nothing special with these characters. Changes the debug switch name from -D to -Z. Adds a -D switch for defining names in systemdict from the command line. Defines -DDEBUG for printing out debugging information during initialization, and -DNODISPLAY for suppressing display output. Corrects a bug that prevented the error machinery from working -- in version 1.0, errors always dumped the stacks and aborted interpretation. Corrects a bug that made eq and ne not work for strings. Makes the atan (arctangent) operator normalize its results according to the PostScript convention. Makes the div operator check for zero divisor. Makes unimplemented operators (resetfile, echo, save, restore, strokepath, reversepath) truly undefined. Makes the interactive loop exit gracefully on end-of-file: in version 1.0 this caused an infinite loop. Implements the status operator. Corrects a bug that made the 'for' operator deliver garbage values if one or more of the operands (start, increment, end) was a real. Corrects a bug that made the arc and arcn operators not pop their operands from the stack. Corrects a bug that made the kshow operator crash the interpreter. Corrects a bug that made the print operator fail on machines that don't pass structure arguments by simply pushing the contents of the structure. Adds a new operator, imagecharpath, to convert images to addcharpath-compatible outlines. Changes alloc and alloc_free to use char * rather than byte *, and alloc_free to return void rather than int, making them compatible with the library's expectations and with malloc/free. Explicitly casts all expressions of the form (ptr1 - ptr2) used as procedure arguments to unsigned, to handle an incompatibility between Turbo C versions 1.5 and 2.0. Changes some of the internal conventions for operators: operators that push on the operand stack must check for overflow explicitly, and operators that modify the execution stack must return a special code. (See oper.h for details.) Initialization (ghost.ps, gfonts.ps) -------------- Modifies ghost.ps and gfonts.ps so they print debugging information only if the name DEBUG is defined. (Presumably the user will set this from the command line with -DDEBUG.) Changes ghost.ps so it initializes the nominal screen size to 640 x 350 on MS-DOS systems as before, but to 612 x 792 on Unix systems, which is an 8.5" x 11" page at 72 pixels per inch. Library ------- Corrects a bug that made the fill and eofill operators (gs_fill and gs_eofill) not perform a newpath afterward. Corrects the bug that made thin, nearly horizontal lines display wrong (as a series of disconnected dots) in the MS-DOS implementation. Fixes a bug in the EGA driver that often made it fill rectangular regions with black around information being displayed in white. Completely changes the internal representation of outline fonts, and changes btoi.ps (a Ghostscript language program for converting bitmaps to outlines) to use a new library call, gs_imagecharpath. Changes the extension for outline font files from .gf to .cp. Adds a new debugging switch, q, that traces all rectangle fill operations. Adds a new debugging switch, v, that traces all device-level output calls. Explicitly casts pointer differences passed as procedure arguments, as in the interpreter. Makes stringwidth work if there is no current point. In version 1.0, this gave a nocurrentpoint error. Usage procedures ---------------- Changes the name of the 'read me' file from READ.ME to README. Removes a bogus line (invoking the 'mcopy' utility) from the makefile. Splits up the makefile into a generic part (ghost.mak) and platform-specific parts (dos-ega.mak, unix-x11.mak). The latter are what is actually executed. Puts the definitions of the DEBUG and gs_DEBUG compilation flags into the makefile instead of in ghost.h and gx.h respectively. Changes the names of the documentation files to be a little less cryptic. Changes all the file names to lower-case in the documentation. Adds installation information to make.doc. Changes all function definitions (but not prototype declarations) to ANSI syntax, and adds a preprocessing step (ansi2knr) to convert them to K&R syntax on Unix systems. Changes the normal MS-DOS link configuration to not assume the presence of an 80x87 coprocessor, and describes how to increase performance if a coprocessor is present. Changes the names of all the interpreter .c files, except stream.c, to begin with 'i'. Version 1.0 (8/11/88) =========== First version released to the public.