September 17, 2019: Release 1.16 This release consists of bugfixes and minor portability improvements. A potential arithmetic overflow was fixed. Rotation angles are now normalized to between -180 and 180. We now use binary file I/O on the OS/2 platform. The test suite tolerances were adjusted. The configuration option --enable-local-getopt was renamed as --with-included-getopt. Some build system improvements. Thanks to Henri Salo and Dave Yeo for reporting bugs and suggesting improvements. August 5, 2017: Release 1.15 This release consists of bugfixes and minor portability improvements. Some potential buffer overflows and arithmetic overflows were fixed, including CVE-2017-12067. A bug triggered by very large bitmaps has been fixed. A new configuration option --enable-local-getopt was added. Thanks to Agostino Sarubbo, Daniel Macks, and Michael Voříšek for reporting bugs and suggesting improvements. February 19, 2017: Release 1.14 This release consists of bugfixes and minor portability improvements. A number of bugs triggered by malformed BMP files have been fixed, including CVE-2016-8685 and CVE-2016-8686. Error reporting has been improved. The image size is now truncated when the bitmap data ends prematurely. It is now possible to use negative dy in bitmap data. Portability has been improved to encompass C++11. The default compiler is now clang if available. Thanks to Nelson Beebe and Martin Gieseking for reporting portability issues, and to Agostino Sarubbo for reporting bugs. October 22, 2015: Release 1.13 Some critical bugs in the processing of BMP files were fixed. These bugs allowed the program to be crashed, or potentially to be abused in other ways, by feeding it specially crafted BMP files. Thanks to Tomasz Buchert and Agostino Sarubbo for reporting these bugs. Portability was improved for C99 and for MSVC++. Thanks to Peter Breitenlohner, Nelson Beebe, and Martin Gieseking for reporting portability issues. March 24, 2015: Release 1.12 Fixed memory overflow bug triggered by very large bitmaps. Fixed binary file mode on 64-bit Windows. Portability improvements. February 19, 2013: Release 1.11 A GeoJSON backend was added; thanks to Christoph Hormann for contributing this. Support for bitfields in the BMP format was added. A minor change was made to the behavior of the alphamax parameter; a value of 0 now gives a true polygon. August 19, 2011: Release 1.10 A DXF backend was added. The output is in the drawing interchange format used by computer aided design software. Thanks to Jonas Benedett Dorr for testing. The Gimppath backend was changed to be compatible with current versions of Gimp. The EPS, PDF, and SVG backends now use high-resolution bounding boxes. The default scaling of the EPS, PDF, and SVG backends is now fixed at 72dpi. A new option --flat was added to the SVG backend. A new option --tight was added to remove whitespace around the input image before calculating its scaling and placement. December 21, 2010: Release 1.9 The xfig and eps backends were improved, and a fixed pagesize PDF backend was added. Support for BMP version 4 and version 5 files, as well as top-down BMP files, was added. Minor speed improvements to Potrace and major speed improvements to mkbitmap. A Gaussian blur option was added to mkbitmap. Libtool is now used to build and optionally install the Potrace library. An optional simplified progress bar was added for dumb terminals. This release also contains some portability improvements, cross-compilation improvements, and minor bug fixes. April 9, 2007: Release 1.8 This release contains minor bugfixes and portability improvements. Rotation is now implemented in the PDF backend. March 6, 2005: Release 1.7 This is a bugfix release. A bug in the progress bar code, which caused arithmetic exceptions on some 64-bit architectures, has been fixed. February 27, 2005: Release 1.6 This release contains an algorithm improvement that leads to a speedup of 20-60% over previous versions of Potrace. A new PDF backend was added, courtesy of Tor Andersson. An option --progress was added for displaying a progress bar. The Windows version of Potrace now uses MinGW instead of Cygwin, eliminating the need to install a special DLL alongside the executable programs, and solving some problems with wildcards and executable PostScript files. Some spurious "premature end of file" messages were eliminated. The core functionality of Potrace was separated into a library with a documented API, making it easier for developers to incorporate Potrace into other GPL-licensed software. July 8, 2004: Release 1.5 The LZW patent has finally expired in Canada. Therefore, postscript level 2 compression can now be implemented directly within Potrace, without having to rely on the external "compress" program. This release makes the necessary corrections. March 6, 2004: Release 1.4 This is a bugfix release. Fixed the bug which sometimes caused Potrace to "hang" on large input files. Also fixed some bugs in the compression code. The presence of the "compress" program is now determined at run-time, rather than compile-time. No new features or command line options were added. January 15, 2004: Release 1.3 This is primarily a bugfix release. Version 1.2 fatally crashed when applied to an empty (all white) bitmap. The options -2 and -3 are now ignored when unsupported, rather than causing an error. There were some improvements to the test suite, autoconfiguration, and portability. The bounding box in the xfig backend was fixed, and the postscript output now has better page encapsulation. Bitmaps of dimension 0 are now tolerated better. December 23, 2003: Release 1.2 New experimental Gimppath and XFig backends were added. A separate program mkbitmap was added, which can be used as a preprocessor to Potrace. It turns greyscale or color images into high-quality bitmaps with optional scaling and filtering. New options --opaque, --group, and --fillcolor were added for greater flexibility in generating editable PostScript and SVG output. The bitmap decomposition algorithm was improved and can now take advantage of 64-bit platforms. Portability and autoconfiguration were vastly improved, and a test suite was added. Runlength encoded BMP files can now be read. Some bugs in command line options were fixed. August 18, 2003: Release 1.1 The most important new feature of this release is an SVG (scalable vector graphics) backend. This file format can be read by vector graphics manipulation programs such as sodipodi, as well as web browsers with an SVG plugin. I also added PGM, PPM, and BMP as additional input file formats. The new --blacklevel and --invert options control how non-black-and-white images are converted to bitmaps before being processed by Potrace. The implementation of a critical function has been improved to make Potrace even faster on large input files; this results in speedups of up to factor 3.3 relative to Potrace 1.0. Autoconfiguration was improved, and the code was polished to compile on more different architectures. The error messages for wrong file formats were also improved. August 10, 2003: Release 1.0 First public release.