1 ================================================================
2 Copyright (c) 1999-2004 Arnar M. Hrafnkelsson. All rights reserved.
3 Copyright (c) 2004 Anthony Cook.
4 This program is free software; you can redistribute it and/or
5 modify it under the same terms as Perl itself.
6 ================================================================
8 >> THIS SOFTWARE COMES WITH ABSOLUTELY NO WARRANTY WHATSOEVER <<
9 If you like or hate Imager, please let us know by sending mail
10 to imager@imager.perl.org
12 ================================================================
15 ========================
16 1. Patent infringements?
17 ========================
19 Imager as such contains no patented algorithms. The external
20 libraries (which are not written by me) may or may not contain
21 patented algorithms. YOU ARE SOLELY RESPONSIBLE FOR OBTAINING
22 LICENSE(S) TO USE SUCH LIBRARIES SHOULD YOU NEED ANY.
25 ========================
26 2. Compiling and testing
27 ========================
29 Some care has been taken to make the installation as smooth as
30 possible. This is rather hard due to the difference between operating
31 systems and site setups. To get started just type
35 It should blurb out a list of which libraries were found and which
36 not. If you add a library to the machine after installing Imager it
37 does not automatically become available in Imager. It only uses the
38 libraries that are found. If the list of found libraries is not what
39 you expected, then the Makefile.PL is either not searching in the
40 right directories or your box does not have the libraries you think it
41 does. For a list of where to get the libraries have a look at
42 3. External dependencies. To widen the search path for libraries and
43 include files set the IM_INCPATH and IM_LIBPATH variables. The
44 environment variables that matter when Makefile.PL is run are
46 IM_INCPATH colon separated list of paths to extra include files
47 IM_LIBPATH colon separated list of paths to extra library files
49 IM_VERBOSE turns on verbose mode for the library scanning and such
50 IM_MANUAL to manually select which libraries are used and which not
51 IM_NOLOG if true logging will not be compiled into the module
52 IM_DEBUG_MALLOC if true malloc debugging will be compiled into the module
53 do not use IM_DEBUG_MALLOC in production - this slows
56 IM_CFLAGS Extra flags to pass to the compiler
57 IM_LFLAGS Extra flags to pass to the linker
58 IM_DFLAGS Extra flags to pass to the preprocessor
62 When finding the libraries has been sorted out it's time for
66 and if that works then do
70 If either fails do take a peek at the file errep.perl. It's creates a
71 file report.txt. This is some information which will help me discover
72 where the problem is so I can try to fix it in future releases. If
73 you find running it ok (just remember - no warranty!) please send the
74 report.txt via email to addi@umich.edu .
78 A common problem is that libgif/libungif are sometimes linked to the X
79 libraries and then running the tests fails. In that case something
82 $ IM_LFLAGS="-L/usr/X11R6/lib -lX11" perl Makefile.PL
84 Which simply sets the environment variables for the extra libraries
85 to include the X libraries (which we do not use at all, but must
86 included since libgif has been linked with it).
88 Otherwise you could just build giflib without any X11 dependencies:
90 # must be a clean tree
92 ./configure --without-x ...
94 Also note that libgif has a few bugs: You can run something like
96 $ perl -Iblib/lib -Iblib/arch t/t105gif.t
98 This way you can see what comments the test script prints out.
99 t/t105gif.t checks for an bug in libgif and prints out a patch
100 if that bug is present, note that this bug only affects the more
101 "advanced" features of libgif.
103 If for some reason you have libungif-devel package installed but
104 not libungif on RedHat then you will probably get lots of errors
105 like undefined symbol: FreeSavedImages when running make test.
106 Install libungif package to fix it.
108 Stock libungif 4.1.2 or later seems to fix all of the bugs, if you
109 have a problem that version of linungif (or later), let us know and
112 Imager needs to have a libtiff version of at least 3.5.5. In the
113 future we might consider supporting older libtiff versions. For
114 now you can either configure Imager manually (by
115 setting the IM_MANUAL environment variable to 1, in sh:
117 $ IM_MANUAL=1 perl Makefile.PL
119 and simply say no to tiff support when asked if you want it, the same thing
120 can be used to circumvent problems in gifs to get Imager going.
122 If it worked just continue with the installation as normally
125 Freetype 1.x vs Freetype 2.x
126 ----------------------------
128 These two libraries have some conflicting include file names, but as
129 long as you don't put the Freetype 2.x freetype.h directory in the
130 include path it should all work.
132 Put the directory containing ft2build.h in the include path, but not
133 the directory containing the freetype 2.x freetype.h.
135 If you see compilation errors from font.c you've probably made the
136 mistake of putting the Freetype 2.x freetype.h directory into the
139 To see which directories should be in the include path, try:
141 freetype-config --cflags
143 ========================
144 3. External dependencies
145 ========================
147 Some hints about getting the Imager module to find the libraries it
148 needs for specific features. The libraries it uses are:
150 jpeg: http://www.ijg.org/files/
151 ftp://ftp.uu.net/graphics/jpeg/jpegsrc.v6b.tar.gz
153 ftp.uu.net is still linked from many places, including the Independent
154 JPEG Groups's home page, but it is non-functional.
156 png: http://www.libpng.org/pub/png/libpng.html
158 you also need zlib to use png: http://www.gzip.org/zlib/
159 We have encountered problems with libpng 1.0.1, which were fixed in 1.0.5
160 Note: you should probably be using zlib 1.1.4, since 1.1.3 has a
161 potential security problem.
163 gif: http://sourceforge.net/projects/libungif
165 giflib/libungif has come a long way since the buggy versions around
166 when Imager's gif support code was written. Preferably you should get
167 at least version 4.1.3. If you have a recent Linux distribution you
168 should be safe with whatever giflib it provides, but if you're
169 building from source, please try to use the latest version.
171 If you download giflib (as opposed to libungif) 4.1.3 from
172 sourceforge, make sure you apply the patch referenced at:
174 https://sourceforge.net/tracker/index.php?func=detail&aid=981255&group_id=102202&atid=631306
176 libungif 4.1.3 does not need this patch.
178 At the time of writing you will need to manually select to install the
179 4.1.2-1 of cygwin's libungif package.
181 tiff: http://www.libtiff.org/
183 t1: http://www.ibiblio.org/pub/Linux/libs/graphics/
186 tt: http://www.freetype.org/
188 Precompiled versions of some of the libraries might be found at:
191 http://www.bullfreeware.com/
195 ========================
196 4. Logging and debugging
197 ========================
199 Logging is compiled in by default - if you should want to get of it
200 from the binaries you can do so by setting the env IMAGER_NOLOG
201 to something. If you want to enable malloc debugging to check for leaks
202 then set IMAGER_DEBUG_MALLOC to something. Needless to say it is
203 pretty pointless to have malloc debug enabled with no logging since you
204 can never see the malloc information that way.
211 Imager can be installed on Win32 systems. This was ported and tested
212 with Microsoft Visual C++ 6.0 with build 623 of ActivePerl. You can
213 use all of the features of Imager. You can also use Win32 GDI fonts
214 directly by supplying the 'face' parameter to Imager::Font->new(...).
216 I've tested with both MSVC++ 6.0 and cygwin (perl 5.6.1).
218 If you see an error under cygwin during testing along the lines of:
220 C:\cygwin\bin\perl.exe: *** unable to remap C:\cygwin\...some dll to the
221 same address as parent (0x...) != 0x....
223 you will need to install the cygwin rebase package and run:
227 Under cygwin you will need at least libungif 4.1.2 installed to
228 prevent lockups in the gif test scripts. At the time of writing you
229 need to select libungif-4.1.2-1 manually in the setup.exe installation
232 If you have any problems with the Win32 support, please email
233 tony@develop-help.com (don't forget to use nmake instead of make).
235 =======================
236 6. General information
237 =======================
239 The Imager module homepage is currently at:
241 http://imager.perl.org/
243 The current docs are rather bad as I've been busy adding features
244 but hopefully they will be updated soon. Until then you'll just
245 have to use the source. The test scripts might also be a good idea.
246 By activating the the #init_log lines in the test script you can get
247 rather verbose debugging output from the C code.
250 ========================
252 ========================
256 Claes Jacobson ( Claes )
257 Philip Gwyn ( Leolo )
258 Michael Slade ( Micksa )
260 Brad Murray ( HalfJack )
261 Nicholas Dronen ( Veblen )
262 Michael G Schwern ( Schwern )
263 Rocco Caputo ( Dngor )
264 Graham barr ( Gbarr )
265 Mark-Jason Dominus ( Mjd )
267 Jason Alexander ( Jalex )
268 Randal R. Schwartz ( Merlyn )
270 Artur Bergman ( Sky )
271 Luc St-Louis ( Lucs )
273 Roderick Schertler ( Roderick )
274 Nathan Torkington ( gnat )
276 (and just to play it safe) all those I forgot to mention.