Obtaining and installing 32 and 64 bit Cairo DLLs for cairocffi under Windows

I was trying to set up the Cairo library in order to test the Phoenix 
version of wx.lib.pdfviewer which uses Cairo if it's available, otherwise 
wx.GraphicsContext is used.I found an installer for the pycairo bindings 
for Python 2.7 but not for any Python 3.x so I was delighted to discover 
Robin has used his time machine and incorporated use of the later, and 
replacement, cairocffi bindings into the Phoenix snapshot builds :)

In wxcairo.__init__ Robin explains how to obtain and install the underlying 
Cairo DLLs that cairocffi uses and points to 
http://www.gtk.org/download/windows.php which appears to recommend 
installing MSYS2. I may have misread things or taken a wrong turn somwhere 
but I didn't get very far with that. Instead I followed advice I read 
somewhere to install the runtimes for GTK+ and use the Cairo libraries from 
there. 

The 32 bit Windows installer is gtk2-runtime-2.24.10-2012-10-10-ash.exe and 
can be obtained from 
http://gtk-win.sourceforge.net/home/index.php/Main/Downloads. It installs 
to C:\Program Files (x86)\GTK2-Runtime with the DLLs in \bin and the 
installer adds this location to your PATH

If running 64 bit Python install using 
gtk2-runtime-2.24.30-2016-04-09-ts-win64.exe from 
https://github.com/tschoonj/GTK-for-Windows-Runtime-Environment-Installer 
which installs to C:\Program Files\GTK2-Runtime Win64 with the DLLs in 
\bin. This installer also adds this location to your PATH.

If you need to work with both 32 and 64 bit versions as I do, in different 
virtualenvs, you can take advantage of the fact that the 
<virtual-env>\Scripts directory of the currently active environment is 
automatically pre-pended to the PATH so the corresponding DLLs can be 
copied there.

For 32 bit Cairo the required files are:
 
Directory of E:\PyDevSrc7\Dp710\env2.7\Scripts

27/12/2010  10:12           538,324 freetype6.dll
22/11/2011  06:48         1,294,335 libcairo-2.dll
31/01/2009  18:42           143,096 libexpat-1.dll
05/02/2010  17:55           279,059 libfontconfig-1.dll
17/08/2010  12:38           230,529 libpng14-14.dll
20/08/2010  07:18           100,352 zlib1.dll
               6 File(s)      2,585,695 bytes

and for 64 bit Cairo are:
 
Directory of E:\PyDevSrc7\Dp710\env3.4\Scripts

09/04/2016  10:46            38,912 iconv.dll
09/04/2016  06:20         6,322,980 libcairo-2.dll
09/04/2016  06:20           553,680 libfontconfig-1.dll
09/04/2016  06:20         3,447,380 libfreetype-6.dll
09/04/2016  06:20         6,054,068 libpixman-1-0.dll
09/04/2016  06:20         1,210,556 libpng16-16.dll
09/04/2016  06:20         5,887,826 libxml2-2.dll
09/04/2016  06:20           108,544 zlib1.dll
               8 File(s)     23,623,946 bytes

Also, the following DLLs are currently included in the distributed wx 
folder:

28/07/2016  16:06           551,096 freetype6.dll
28/07/2016  16:06         1,182,444 libcairo-2.dll
28/07/2016  16:06            43,987 libcairo-gobject-2.dll
28/07/2016  16:06           182,502 libcairo-script-interpreter-2.dll
28/07/2016  16:06           143,096 libexpat-1.dll
28/07/2016  16:06           279,059 libfontconfig-1.dll
28/07/2016  16:06           230,529 libpng14-14.dll
28/07/2016  16:06           100,352 zlib1.dll

I assume these are 32 bit versions and they should perhaps be removed from 
there?

In the hope this may be useful.

Regards
David Hughes
Forestfield Software

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