libwmf-0.2.2 Release Notes
--------------------------
While there have been some improvements to text placement and rendering in the
X and gd layers, most changes are in the configuration. (It is now possible to
build libwmf without any device layers, but this has not been tested extensively
and is not recommended for general use.)
Special thanks to Bob Friesenhahn, Leonard Rosenthol, David C Sterratt and
Tomasz Kłoczko.
Hopefully this release will build on Solaris. My apologies to everyone who had
problems with libwmf-0.2.1.
libwmf-0.2.1 Release Notes
--------------------------
In adherence with the ancient philosophy of `It's my birthday and I'll release
if I want to,' today, August 22nd 2001, sees the release of libwmf-0.2.1,
a.k.a. `The Inspector General's Nose'.
I was, in fact, tempted to call it version 0.3.0, but I've been calling it
0.2.1 for so many preview snapshots that, well, to do otherwise now would seem
like a betrayal.
The most significant change is the introduction of redirectable character
output streams (i.e., wmfStream) which should facilitate the writing of WMF
importers. - Speaking of which, CVS sodipodi now has optional support for
importing WMF, requiring libwmf-0.2.1, and an importer for AbiWord is in the
works.
This has, however, necessitated a slight change in the API, and people who use
libwmf in conjuction with wv will need to upgrade to wv-0.7.0 or later.
Other significant changes are support for a ghostscript-style fontmap and the
beginnings of doxygen-generated documentation (which will grow more complete
with future releases).
Otherwise, there has been considerable clean-up, bug-fixes and improvement of
both the source and the build system, and some additional functionality,
including:
(a) The .fig export uses scaling now, and has options to save images as PNG
or JPEG.
(b) The .svg export now supports inline (data URI) images and compression to
.svgz (plus sodipodi-specific workarounds).
(c) Use of metafile size info., if any (a mixed blessing).
Special thanks to:
(a) Matej Vila, for helping to make libwmf more Debian-friendly;
(b) Michael Cree, for helping me to get libwmf working on Tru64;
(c) Steve Oney, whose help I have not yet done justice to...
Thanks also to: Bob Friesenhahn, Michal Jaegermann, Anil Madhavapeddy,
Jacqueline Signore, Shuang Wang, Sean Young, and Kees Zeelenberg.
Finally, having just assumed the mantle of maintainership, I would like to
take this opportunity once again to thank Martin Vermeer for all of his work
on libwmf.
Francis James Franklin <fjf@alinameridon.com> 22nd August, 2001
===============================================================================
Amendment #1
------------
This version of libwmf is now officially part of the wvWare project, available
by CVS under the module named `libwmf2'.
I have added device layers for SVG (W3C's XML-based vector graphic format) and
MVG (ImageMagick's proprietary vector graphic format); the X device layer has
not been changed and I have no intention of changing it in the near future, but
it works. I have also added a device layer for GNU plotutils, but currently it
is only a shell, so don't use it.
The MVG work is based on information supplied by Bob Friesenhahn who did the
WMF coder for ImageMagick. (ImageMagick's WMF coder links against libwmf(1),
not this version.) I am using version ImageMagick-5.3.3, and I don't know
whether earlier (or later) versions will be compatible with the MVG format
assumed by libwmf. In fact, I am already finding bugs, particularly with
dashed lines... Also, I don't really know how to implement fonts; I suspect
ImageMagick could do with some serious hacking on this point...
Martin Vermeer has added a FIG device layer, so now there are two routes
available if anyone wants to *edit* the images as vector graphics:
(a) WMF->FIG for editing with xfig;
(b) WMF->SVG for editing with, for example, sodipodi (best to get the *very*
latest source for sodipodi; the GNOME-1.4 release and earlier are colour-
blind).
The svg & magick device layers write all bitmap data as PNG images, using
filenames provided via the device layer interface.
The current version of the GD library subsumed within libwmf is gd-2.0.0, with
my additions. This supports 24-bit colour.
There is some documentation, but the best way to learn how to use the various
the device layers is to read the source in src/convert/
Francis James Franklin <fjf@alinameridon.com> 13th May, 2001
===============================================================================
This is my own (i.e., unofficial) development version of libwmf which I propose
as a candidate for release as (official) libwmf version 0.2.0.
Although based on Caolan's excellent libwmf, there has been an almost complete
restructuring to take libwmf away from it's batch-process origins and make it
as well-behaved a library as possible.
(1) The names have been changed to protect the innocent. All global / external
variables have the prefix `wmf' (or, since the GD library is subsumed
within libwmf, `gd'). With very few exceptions:
(a) functions: wmf_function_name (...)
(b) types: wmfType, or wmfType_t
(c) macros: WMF_Macro (...)
(2) It is my belief that device-layer (e.g., output) implementations should
not need to know anything about wmf files or the interpreter's methods.
In addition, the writing of such device-layers should be made as simple
as possible, though not of course at the expense of image fidelity or
quality.
As such, I have crafted a new interface between the interpreter and the
device layer, which I choose to call the `ipa' (as opposed to the `api'
which is the `application / program interface'). There must also be an
interface between the application and the device layer, but this third
interface is independent of the interpreter.
Although this may sound unnecessarily complicated, in fact it makes
programming applications or device layers significantly easier.
(3) With very few exceptions, all function calls refer to a variable of type
`wmfAPI' which incorporates all data associated with a given wmf file.
A final call to wmf_api_destroy frees up all memory allocated during the
initialization and processing of the metafile.
(4) (a) There is no longer any dependence on temporary files; all processing
of the metafile is performed in-memory or w.r.t. original metafile.
(b) Metafiles can be in-memory if desired; or applications can specify
their own read/seek/tell functions for reading the metafile.
(5) (a) Xpm dependence & system calls have been removed; libwmf provides
bitmap scaling functionality.
(b) Bitmaps are read using code taken from ImageMagick [?? - are there
licensing issues to be addressed here?]
(c) libwmf now uses freetype (2) for stringwidth calculations, and is
bundled with the standard thirteen ghostscript fonts [?? - are there
licensing issues to be addressed here?]
(d) libwmf incorporates GD (gd-1.8.4 at time of writing) which supports
freetype (2), with some enhancements (filled arcs & clipping).
*
* libz, libpng and freetype(2) are the sole required external libraries.
*
(6) (a) The build system uses automake and libtool, and the only library
created is `libwmf', which includes the eps and gd device layers and
the GD library as well as the interpreter and api.
(b) Header files are installed in a `libwmf' sub-directory.
(7) I have added the wmf examples with Tor Lillqvist's plug-in for the Gimp:
http://www.iki.fi/tml/gimp/wmf
[?? - are there licensing issues to be addressed here?]
Currently the only device layers are eps [eps & ps] and gd [png & jpeg].
Implementing more should be relatively straight-forward. I recognize that,
until device layers for X, xfig and magick exist, this proposed revision of
libwmf is at a disadvantage...
I have tested only with PPC Linux 2000 and (x86) Linux RH7.
Francis James Franklin <fjf@alinameridon.com> 4th March, 2001
===============================================================================
