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 ChangeLog
 
 v1.16 2019/09/17
         (2019/09/16) PS1 - portability: use AC_USE_SYSTEM_EXTENSIONS
         instead of individual feature test macros.
         (2019/09/16) PS1 - automake: handle conditional sources better.
         (2019/05/16) PS1 - normalize rotation angle
         (2019/02/26) PS1 - portability: use binary file i/o in OS/2,
         suggested by Dave Yeo.
         (2018/07/27) PS1 - autoconf: renamed --enable-local-getopt as
         --with-included-getopt.
         (2018/07/26) PS1 - test suite: adjusted tolerances.
         (2017/08/06) PS1 - fixed a potential arithmetic overflow. Fixes
         bugs #23 and #24 reported by Henri Salo.
 
 v1.15 2017/08/05
         (2017/08/05) PS1 - use round() instead of rint()
         (2017/08/05) PS1 - portability: set both _POSIX_C_SOURCE and
         _NETBSD_SOURCE to enable strdup prototype in string.h, as
         _XOPEN_SOURCE=500 doesn't work on macOS, _XOPEN_SOURCE=600 doesn't
         work on SunOS, and _POSIX_C_SOURCE alone doesn't work on Minix.
         (2017/08/02) PS1 - fixed a potential arithmetic overflow.
         (2017/06/17) PS1 - fixed a bug with very large bitmaps. Reported
         by Michael Voříšek.
         (2017/03/05) PS1 - autoconf: added --enable-local-getopt to avoid
         using the system-wide getopt library (it may still end up being
         used on GNU systems).
         (2017/03/05) PS1 - portability: moved getopt.h to a subdirectory,
         to be included only when needed. Reported by Daniel Macks.
         (2017/03/05) PS1 - portability: use _XOPEN_SOURCE=600 to fix macOS
         warning.
         (2017/02/27) PS1 - fixed more buffer overflows (not security
         critical), including one reported by Agostino Sarubbo. This also
         fixes CVE-2017-12067.
 
 v1.14 2017/02/19
         (2017/02/19) PS1 - speed: use clang as default compiler if
         available, and no longer use -ffloat-store even with gcc.
         (2017/02/18) PS1 - corrected some exit codes, added some missing
         error handlers.
         (2017/02/17) PS1 - mkbitmap: bugfixes and improvements in parsing
         image files.
         (2017/02/15) PS1 - truncate the image size when bitmap data ends
         prematurely. This fixes CVE-2016-8686, where Potrace appeared to
         be "hanging" on a crafted input file.
         (2017/02/14) PS1 - test suite: added tests for plain pnm files.
         (2017/01/08) PS1 - fixed potential compiler issues due to signed
         arithmetic overflow and arithmetic shifting.
         (2017/01/07) PS1 - enable use of negative dy in bitmap data.
         (2017/01/07) PS1 - test suite: moved data files to a subdirectory.
         (2017/01/07) PS1 - test suite: added a check for -i flag.
         (2017/01/07) PS1 - fixed buffer overflow CVE-2016-8685, reported
         by Agostino Sarubbo.
         (2015/10/24) PS1 - portability: use const char * for string
         constants, required by C++11. Reported by Martin Gieseking.
         (2015/10/24) PS1 - portability: extra spaces around string macros,
         required by C++11. Reported by Martin Gieseking.
         (2015/10/24) PS1 - portability: added more potential C compilers
         to autoconf. Suggested by Nelson Beebe.
 
 v1.13 2015/10/22
         (2015/07/18) PS1 - fixed heap overflows, null pointer dereference
         bugs and a memory leak. Reported by Agostino Sarubbo.
         (2015/05/17) PS1 - man page: show which backends are dimension
         based, and state more clearly that svg backend defaults to 72dpi.
         (2015/04/11) PS1 - portability: ssize_t not supported on some
         systems; use ptrdiff_t instead. Reported by Martin Gieseking.
         (2015/03/28) PS1 - portability: added missing #includes for c99,
         reported by Nelson Beebe.
         (2015/03/27) PS1 - include config.h before other header files,
         reported by Peter Breitenlohner.
         (2015/03/26) PS1 - fixed division by zero bug triggered by bitmap
         of dimension 1x0. Reported by Tomasz Buchert.
 
 v1.12 2015/03/24
         (2015/03/20) PS1 - fixed memory overflow bug triggered by very
         large bitmaps. Fixes RedHat bug #955808 reported by Vincent Danen
         and Debian bug #778646 reported by Moritz Muehlenhoff.
         (2014/09/06) PS1 - test suite: added binary-check, to check that
         files are written in binary mode. Mostly relevant on Windows.
         (2014/09/06) PS1 - portability: fixed potential binary file mode
         bug on MinGW64.
         (2014/03/30) PS1 - man pages: fixed leading blank page with
         groff -man -Tps.
         (2013/12/29) PS1 - portability: made regular expressions in test
         suite POSIX compliant, reported by Ben Bullock.
         (2013/05/14) PS1 - distribution: removed libtool from distribution.
 
 v1.11 2013/02/19
         (2013/02/10) PS1 - bitops.c: added "cc" as a clobbered register.
         (2012/09/13) PS1 - GeoJSON backend: -u option affects rounding,
         not scaling.
         (2012/09/12) CH1 - added GeoJSON backend.
         (2012/03/04) PS1 - minor change in behavior of alphamax parameter:
         make a corner if alpha >= alphamax (instead of >). This makes
         little practical difference, except when alphamax = 0, in which
         case we now get a polygon. Fixes bug #3495854, reported by
         scribbleink.
         (2012/02/24) PS1 - added support for BMP format with bitfields.
 
 v1.10 2011/08/19
         (2011/08/07) PS1 - added --tight option
         (2011/08/05) PS1 - backends: simplified dimension calculations
         (2011/08/05) PS1 - eps backend: prevent integer overflow in
         bounding box.
         (2011/08/05) PS1 - disallow resolution of 0 dpi.
         (2011/08/05) PS1 - man page: added BACKEND TYPES section
         (2011/08/05) PS1 - fixed default scaling at 72dpi for
         variable-sized backends
         (2011/08/02) PS1 - new gimppath backend produces SVG output
         suitable for current versions of Gimp.
         (2011/08/02) PS1 - added a --flat option for the SVG backend.
         (2011/07/31) PS1 - test suite: renamed *.out files to prevent
         make's built-in implicit rules from accidentally overwriting them.
         (2011/07/26) PS1 - added DXF backend. Thanks to Jonas Benedett
         Dorr for testing.
         (2011/07/26) PS1 - use high resolution bounding box in EPS, PDF,
         and SVG backends
         (2011/05/13) PS1 - autoconf: CADD can now be given at compile time
 
 v1.9 2010/12/21
         (2010/12/20) PS1 - getopt.h: fixed compiler warnings
         (2010/12/20) PS1 - added --tty option to specify progress bar
         rendering at runtime.
         (2010/12/20) PS1 - added simplified progress bar for Windows or
         other dumb terminals. New --enable-dumb-tty configuration option.
         (2010/12/16) PS1 - test suite: fixed bug where a failed test was
         not reported in backend-check.sh
         (2010/12/15) PS1 - test suite: support for $EXEEXT
         (2010/12/15) PS1 - optimized penalty3 inner loop, 4.6% speedup.
         (2010/12/15) PS1 - autoconf: new CADD variable to add to CFLAGS
         (2010/12/15) PS1 - fixed some compiler warnings, added some error
         handlers, and added some cosmetic top-level free's.
         (2010/11/25) PS1 - added support for some BMP version 4 and 5
         files, and for top-down BMP files. Suggested by Kanwar Sangwan.
         (2010/11/13) PS1 - don't enter filter mode if -- is used
         (2010/11/09) PS1 - greymap.h, bitmap.h: drop unneeded dependencies
         (2010/09/07) PS1 - autoconf: fixed getopt_long test to allow
         cross-compiling, bug #3061403, reported by Igor Filippov.
         (2010/08/31) PS1 - test suite: added environment variables
         CHECK_POTRACE and CHECK_MKBITMAP to allow binaries outside the
         build tree to be tested
         (2010/08/09) PS1 - autoconf: converted to libtool
         (2010/08/05) PS1 - autoconf: renamed configure.in as configure.ac
         (2010/08/05) PS1 - autoconf: added --with-libpotrace to optionally
         install the Potrace library and header files.
         (2009/08/03) PS1 - portability: c++ wrapper in potracelib.h,
         suggested by Peter Jankuliak.
         (2009/05/13) PS1 - added pdfpage backend for fixed pagesize PDF
         output.
         (2009/04/07) PS1 - decompose.c: minor optimization
         (2008/10/08) PS1 - mkbitmap: speed increase by 8% to 26% by
         eliminating unnecessary bounds checks and interpolation.
         (2008/10/05) PS1 - trace.c: separate function for path reversal
         (2008/10/03) PS1 - progress.h: do the right thing if progress ==
         NULL
         (2008/10/03) PS1 - moved detrand() to auxiliary.h
         (2008/08/21) PS1 - mkbitmap: added --blur option.
         (2008/08/12) PS1 - combined the old -V option with -v.
         (2008/08/12) PS1 - test suite: adjusted tolerances to fix bug
         #1745456
         (2007/12/31) PS1 - include curve.h where path_t is used
         (2007/12/28) PS1 - flush stderr when interleaved with stdout
         (2007/12/28) PS1 - portability: don't hardcode size of short int
         (2007/11/09) PS1 - eps backend: use save-restore to avoid
         polluting caller's dictionary and for page independence.
         (2007/05/22) PS1 - xfig backend: added depth to opaque components
         to avoid them floating to the background. Suggested by Rafael
         Laboissiere.
 
 v1.8 2007/04/09
         (2007/04/08) PS1 - portability: use 'test' instead of '[' in shell
         scripts.
         (2007/04/08) PS1 - test suite: run PDF checks as a separate test.
         (2007/04/06) PS1 - fixed logical expressions in flate.c
         (2007/02/19) PS1 - portability: replacements for inline and M_PI
         (2007/01/16) PS1 - test suite: added checks for rotation in
         PostScript, PDF, and PGM backends
         (2007/01/16) PS1 - pdf backend: added rotation
         (2007/01/16) PS1 - pdf backend: renamed shipcom() function
         (2007/01/14) PS1 - autoconf: check if getopt_long reorders its
         arguments.
         (2007/01/13) PS1 - made pseudo-random number generation
         thread-safe and much faster.
         (2006/12/20) PS1 - renamed some structures in lzw.c, main.h
         (2006/12/20) PS1 - portability: fixed some compiler issues for
         Amiga, reported by Andreas Kleinert.
         (2006/12/20) PS1 - main.c: changed some return types to void.
         (2006/08/14) PS1 - made curve.c:privcurve_free_members() static.
         (2005/12/22) PS1 - renamed README.win as README-WIN
         (2005/11/11) PS1 - portability: use binary file i/o in Cygwin.
         Suggested by Henry He.
         (2005/06/24) PS1 - potracelib: fixed allocation bug, reported by
         Jung Shin.
         (2005/06/23) PS1 - potracelib_demo.c: free resources properly.
         (2005/06/23) PS1 - initialize unused private state to 0.
         (2005/06/23) PS1 - decompose.c: improved memory allocation scheme.
         (2005/05/06) PS1 - added "alphacurve" field to private curve
         structure, so that backends that don't use the public interface
         (such as the EPS backend) can be warned of non-conforming curves.
 
 v1.7 2005/03/06
         (2005/03/05) PS1 - fixed progress bar subrange bug.
 
 v1.6 2005/02/27
         (2005/02/22) PS1 - added "epsilon" feature to progress bar.
         (2005/02/22) PS1 - documentation: changed potracelib documentation
         to TeX format.
         (2005/02/07) PS1 - tweaked progress bar
         (2005/01/24) PS1 - added --progress option to potrace frontend.
         (2005/01/24) PS1 - potracelib: added progress bar interface.
         (2005/01/23) PS1 - fixed overflow bug in fast summing code.
         (2005/01/23) PS1 - rewrote trace.c:bestpolygon(). This speeds up
         potrace by 20% on typical data and up to 60% in some bad cases.
         (2004/12/07) PS1 - documentation: added potracelib.txt
         (2004/12/07) PS1 - renamed aux.h as auxiliary.h, since aux is an
         invalid filename in Windows.
         (2004/12/06) PS1 - API: added default parameters
         (2004/12/06) PS1 - API: added potrace_state_t
         (2004/12/06) PS1 - API: added "const" qualifiers
         (2004/12/06) PS1 - removed conv and areac fields from privpath_t.
         (2004/12/06) PS1 - changed bounding box handling in decompose.c
         (2004/12/06) PS1 - split curve_t into public and private parts.
         (2004/12/06) PS1 - moved curve/path allocation to curve.c.
         (2004/12/06) PS1 - renamed a type in lzw.h.
         (2004/12/06) PS1 - renamed source files.
         (2004/12/04) PS1 - split path_t into public and private parts.
         (2004/12/03) PS1 - split core functionality from user interface.
         (2004/12/03) PS1 - moved parts of bitmap.h to potracelib.h. Split
         bitmap.c into bitmap.c and bitmap_io.c. Moved path decomposition
         auxiliary functions from bitmap.c to path.c.
         (2004/12/03) PS1 - converted some stray local functions to static
         (2004/12/01) PS1 - moved basic curve data type definitions to
         potracelib.h
         (2004/12/01) PS1 - collected some repeatedly used macros in aux.h
         (2004/12/01) PS1 - started to create API to potrace core
         functionality in potracelib.c and potracelib.h. Also added new
         libpotrace.a target.
         (2004/12/01) PS1 - made curve.c and path.c reentrant by removing
         global variable "info".
         (2004/11/28) PS1 - made a85* auxiliary functions static in
         flate.c.
         (2004/11/28) PS1 - pdf backend: removed arbitrary page limit.
         (2004/11/24) PS1 - pdf backend: replaced ftell() by explicit byte
         count to work correctly with stdout.
         (2004/11/24) PS1 - portability: use binary file i/o in MinGW.
         (2004/10/08) PS1 - minor cleanup in backend_pdf.c.
         (2004/09/21) PS1 - replace -O3 compilation default by -O2; inlined
         critical functions manually instead.
         (2004/09/18) PS1 - slightly optimized multiplications in
         curve.c:bezier(). Thanks to Thomas M.Ott for suggesting it.
         (2004/09/16) PS1 - list of backends in help message is now
         generated.
         (2004/09/16) PS1 - test suite: added test for pdf backend.
         (2004/09/14) PS1 - removed bits.c, renamed bits.h to bitops.h, and
         use static inline functions instead of macros.
         (2004/09/14) PS1 - test suite: adjusted tolerances.
         (2004/09/12) PS1 - mkbitmap: when reading plain pbm files, use
         colors 0 and 255, not 0 and 1.
         (2004/09/12) PS1 - potrace and mkbitmap: don't complain about
         "junk at the end of file" if the junk is whitespace and
         comments. Treat files which contain only whitespace and comments
         as empty.
         (2004/08/05) TA1 - added pdf backend.
 
 v1.5 2004/07/08
         (2004/07/08) PS1 - removed dependency on external "compress"
         program. Removed ztops.c, added lzw.c, bits.c.
         (2004/03/17) PS1 - don't leave temporary file /tmp/have_compress.*
         lying around.
         (2004/03/06) PS1 - fixed a type error in have_compress.c:28.
 
 v1.4 2004/03/06
         (2004/03/05) PS1 - removed the compile-time check for the
         "compress" program and replaced it by a run-time check.
         (2004/03/03) PS1 - ztops.c: fixed compression bug where garbage
         was added after the end of stream.
         (2004/02/09) PS1 - further optimized the speed of the function
         path.c:pathlist_to_tree, which now takes less than 0.1% of total
         running time.
         (2004/02/09) PS1 - distribution: removed potrace.{ps,pdf} from
         distribution, changed textfiles to DOS mode in Cygwin distribution
         (2004/01/19) PS1 - corrected a bug in 1.2 which caused an enormous
         slowdown in the function path.c:pathlist_to_tree.
         (2004/01/17) PS1 - test suite: better quoting in shell scripts to
         be more robust against spaces in filenames etc.
         (2004/01/17) PS1 - test suite and ztops.c: respect TEMPDIR
         environment variable, if set.
 
 v1.3 2004/01/15
         (2004/01/14) PS1 - test suite: adjusted tolerances.
         (2004/01/13) PS1 - when reading a bitmap of width or height 0,
         pretend the offending dimension is 1. This is not 100% logical
         in all cases, but better than producing garbage.
         (2004/01/13) PS1 - fixed bounding box in xfig backend.
         (2004/01/13) PS1 - added missing gsave/grestore to ps backend.
         (2004/01/07) PS1 - autoconf: search for zlib.h in
         ${prefix}/include and for libz.so in ${prefix}/lib, in case they
         are not found elsewhere.
         (2004/01/07) PS1 - eliminated some unused variables.
         (2004/01/07) PS1 - portability: eliminated typeof() from
         mkbitmap.c
         (2004/01/07) PS1 - test suite: added a test for empty bitmaps.
         (2003/12/25) PS1 - fixed bug #866223: potrace crashes when applied
         to an empty bitmap.
         (2003/12/25) PS1 - when options -2 or -3 are unsupported, ignore
         them rather than failing, for improved compatibility.
         (2003/12/25) PS1 - autoconf: added --disable-zlib configuration
         option and improved error messages for missing zlib.h or libz.so
         (2003/12/25) PS1 - portability: eliminated dynamic arrays in
         mkbitmap.c
         (2003/12/25) PS1 - test suite: added a check for mkbitmap.
         (2003/12/25) PS1 - test suite: more portable filesize checking in
         backend-check.sh
 
 v1.2 2003/12/23
         (2003/12/23) PS1 - added an xfig backend.
         (2003/12/23) PS1 - added --group option to group related shapes
         together in SVG backend.
         (2003/12/23) PS1 - added --opaque option to paint white shapes
         opaquely, instead of leaving them transparent, in PS/EPS and SVG
         backends.
         (2003/12/23) PS1 - rewrote path decomposition algorithm to
         calculate path containment tree, to be used for grouping.
         (2003/12/23) PS1 - test suite: added a check of postscript output
         using ghostscript.
         (2003/09/18) PS1 - autoconf: added tests for -lm and -lz
         libraries, and for zlib.h header file.
         (2003/09/18) PS1 - portability: cleaned up code so that it can be
         compiled with a C++ compiler.
         (2003/09/17) PS1 - code cleanup in main.c:main().
         (2003/09/17) PS1 - added mkbitmap program.
         (2003/09/17) PS1 - added -ffloat-store compiler flag for improved
         floating point predictability.
         (2003/09/12) PS1 - test suite: added test for BMP runlength
         encoding.
         (2003/09/12) PS1 - fixed frontend for BMP runlength encoding.
         (2003/09/11) PS1 - autoconf: added test to work around gcc
         compiler bug 12243, which affected curve.c:adjust_vertices().
         (2003/09/11) PS1 - renamed pbm.c as bitmap.c, pgm.c as greymap.c
         (2003/09/11) PS1 - moved some bitmap details from path.c to pbm.c
         (2003/09/10) PS1 - renamed pbm.h macros to start with BM_
         (2003/09/02) PS1 - portability: added missing fallback value for
         M_PI to backend_pgm.c.
         (2003/08/28) PS1 - specialized matrix solving code for n=2.
         (2003/08/28) PS1 - portability (and scalability): eliminated
         dynamic arrays.
         (2003/08/28) PS1 - portability: replaced vsnprintf by vsprintf.
         (2003/08/28) PS1 - portability: provided fallback value for M_PI
         (2003/08/27) PS1 - autoconf: now checks whether the compress
         program works, not just whether it exists.
         (2003/08/27) PS1 - test suite: wrote three tests for "make check"
         (2003/08/27) PS1 - portability: fixed some floating point errors
         on DEC Alpha: division by zero and log of zero.
         (2003/08/27) PS1 - changed bitmap representation to take advantage
         of 64-bit architectures.
         (2003/08/27) PS1 - changed default scaling in ps and eps modes for
         small page sizes.
         (2003/08/26) PS1 - allow arguments of command line options -b, -z,
         -P to be abbreviated by "unambiguous prefix".
         (2003/08/26) PS1 - added rotation to gimppath backend.
         (2003/08/24) PS1 - portability: removed GNU extensions from printf
         format strings in backend_eps.
         (2003/08/22) PS1 - converted --unit to double value.
         (2003/08/22) PS1 - added experimental gimppath backend.
         (2003/08/20) PS1 - close paths in postscript/eps backend.
         (2003/08/20) PS1 - fixed bug in parsing command line options: long
         options --cleartext, --level2, --level3 did not work properly.
         Thanks to George Williams for reporting this bug.
 
 v1.1 2003/08/18
         (2003/08/17) PS1 - replaced calc_lon algorithm by a faster
         implementation. This results in speedups of up to factor 3.3 for
         certain large input files.
         (2003/08/17) PS1 - added --invert option.
         (2003/08/17) PS1 - improved error messages on wrong file format.
         (2003/08/17) PS1 - code cleanup to build under fussier compilers.
         Thanks to Nelson Beebe for submitting compiler logs for a large
         number of setups.
         (2003/08/17) PS1 - renamed curve.c:quad as quadform to avoid name
         clash on IBM AIX, Compaq/DEC ODF/1.
         (2003/08/17) PS1 - autoconf: let user override CFLAGS at configure
         time, and use -Wall and -O3 only for gcc compiler
         (2003/08/16) PS1 - added --blacklevel option to control
         image-to-bitmap conversion
         (2003/08/16) PS1 - added ability to read BMP files. Changed error
         reporting in case of empty files, or if there is junk at the end
         of a file in multipage mode.
         (2003/08/14) PS1 - as a convenience, now also read files in PGM
         and PPM format and convert to bitmap by simple threshold method.
         This is because many programs, including the Gimp and the *topnm
         tools, produce PNM output which must be further converted to PBM.
         (2003/08/14) PS1 - rearranged order of options in usage message.
         (2003/08/14) PS1 - implemented -d1 option for SVG backend. This
         outputs a jaggy bitmap with no smoothing.
         (2003/08/14) PS1 - autoconf: improved handling of
         --enable-compress
         (2003/08/14) PS1 - added SVG backend.
         (2003/08/14) PS1 - renamed old -s option as -S
         (2003/08/12) PS1 - added README.win
         (2003/08/12) PS1 - autoconf: fixed bug #787182: added non-standard
         compile time options to help message for ./configure script
 
 v1.0 2003/08/10
         (2003/08/10) PS1 - added file i/o code
         (2003/08/08) PS1 - optimized number of times the penalty3 function
         is called. Speedups of factor 2.7 were observed on large files.
         (2003/08/08) PS1 - added --opttolerance and --alphamax options.
         (2003/08/07) PS1 - autoconf: changed configure.in so that test for
         compress is omitted when the user overrides it - this prevents a
         wrong cached value to be read.
         (2003/08/07) PS1 - keep output flushed in postscript mode
         (2003/08/07) PS1 - fixed memory leak in multiple page mode
         (2003/08/06) PS1 - replaced --opticurve by --longcurve option;
         opticurve is now the default
         (2003/08/06) PS1 - added opticurve sensitivity to pgm backend
         (2003/08/06) PS1 - restricted opticurves to be bounded away from
         180 degrees
         (2003/08/06) PS1 - allow margins and papersize to determine width
         if it is not defined by other means in postscript mode
         (2003/08/06) PS1 - added ability to read multiple bitmaps in
         postscript mode
         (2003/08/05) PS1 - new --longcoding option
         (2003/08/05) PS1 - new optimized eps backend which works with
         opticurve.
         (2003/07/31) PS1 - replaced O(n^3) calc_lon algorithm by a new
         O(n^2) algorithm. Observed speedups of factor 80.
         (2003/07/27) PS1 - added --opticurve option and integrated
         opticurve code in curve.c
         (2003/06/04) PS1 - made bm_to_pathlist a lot more efficient by
         scanning and clearing only bounding box of mask in inner scan.
         (2002/11/17) PS1 - changed bm_to_pathlist prototype to use
         explicit return value.
         (2002/10/09) PS1 - autoconf: added automake/autoconf scripts in
         preparation for public distribution.