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    1 Pango is a library for layout and rendering of text, with an emphasis
    2 on internationalization. Pango can be used anywhere that text layout
    3 is needed; however, most of the work on Pango so far has been done using 
    4 the GTK+ widget toolkit as a test platform. Pango forms the core of text
    5 and font handling for GTK+-2.x.
    6 
    7 Pango is designed to be modular; the core Pango layout can be used
    8 with different font backends. There are three basic backends, with
    9 multiple options for rendering with each.
   10 
   11  - Client side fonts using the FreeType and fontconfig libraries.
   12    Rendering can be with with Cairo or Xft libraries, or directly
   13    to an in-memory buffer with no additional libraries.
   14 
   15  - Native fonts on Microsoft Windows using Uniscribe if available for
   16    complex script handling. Rendering can be done via Cairo or
   17    directly using the native Win32 API.
   18 
   19   - Native fonts on MacOS X, rendering via Cairo.
   20 
   21 The integration of Pango with Cairo (http://cairographics.org)
   22 provides a complete solution with high quality text handling 
   23 and graphics rendering.
   24 
   25 Dynamically loaded modules then handle text layout for particular
   26 combinations of script and font backend.
   27 
   28 As well as the low level layout rendering routines, Pango includes
   29 PangoLayout, a high level driver for laying out entire blocks of text,
   30 and routines to assist in editing internationalized text.
   31 
   32 For more information about Pango, see:
   33 
   34  http://www.pango.org/
   35 
   36 Dependencies
   37 ============
   38 
   39 Pango depends on the GLib library; more information about GLib can
   40 be found at http://www.gtk.org/.
   41 
   42 When using client side fonts, the fontconfig library
   43 (http://www.fontconfig.org) to look up fonts. At least version 2.0.9
   44 of the FreeType font handling library (http://www.freetype.org) is
   45 also required.
   46 
   47 Cairo support depends on the Cairo library (http://cairographics.org).
   48 The Cairo backend is the preferred backend to use Pango with and is
   49 subject of most of the development in the future.  It has the
   50 advantage that the same code can be used for display and printing.
   51 
   52 We suggest using Pango with Cairo as described above, but you can also
   53 do X-specific rendering using the Xft library. The Xft backend uses
   54 version 2 of the Xft library to manage client side fonts. Version 2 of
   55 Xft is available from http://xlibs.freedesktop.org/release/.  You'll
   56 need the libXft package, and possibly the libXrender and renderext
   57 packages as well.  You'll also need fontconfig (see below.)
   58 
   59 Installation of Pango on Win32 is possible, but is not documented
   60 here. See http://www.gimp.org/~tml/gimp/win32/downloads.html
   61 
   62 Notes
   63 =====
   64 
   65  - By default, Pango tries to build itself so that no explicit
   66    dependency on Xft or FreeType will be introduced in apps that
   67    link to Pango. This is to avoid compatibility problems with
   68    changes in the Xft or FreeType API's or ABI's. Specifying 
   69    --enable-explicit-deps or --enable-static when configuring Pango 
   70    will defeat this and should be avoided if possible.
   71 
   72 License
   73 =======
   74 
   75 Most of the code of Pango is licensed under the terms of the 
   76 GNU Lesser Public License (LGPL) - see the file COPYING for details.
   77 
   78 The OpenType code in pango/opentype is derived from the FreeType 
   79 project (http://www.freetype.org) and is dual-licensed under the 
   80 GNU General Public License and the FreeType license. See see
   81 pango/opentype/FT-license.txt for full details of the FreeType 
   82 license.
   83 
   84 Note that binary distributions of Pango must include a disclaimer 
   85 that the software is based in part of the work of the FreeType Team, 
   86 in the distribution documentation; for instance, by including this 
   87 README file.
   88 
   89 Owen Taylor
   90 otaylor@redhat.com
   91 
   92 Behdad Esfahbod
   93 behdad@gnome.org
   94 
   95 26 February 2007