AGG的GPL使用协议

前言说明

AGG2.4采用BSD协议，AGG2.5改用GPL协议

据传闻，两者改动不大

总结如下

1）应用于商业闭源，且免费使用，请使用2.4或者之前的版本。

2）GPL协议不支持商业闭源

英文官网内容

AGG 2.5 License

Anti-Grain Geometry is an Open Source, free library released under the terms and conditions ofGNU GPL license.

Anti-Grain Geometry (AGG) - Version 2.5  A high quality rendering engine for C++  Copyright (C) 2002-2006 Maxim Shemanarev  Contact: [email protected]           [email protected]           http://antigrain.com    AGG is free software; you can redistribute it and/or  modify it under the terms of the GNU General Public License  as published by the Free Software Foundation; either version 2  of the License, or (at your option) any later version.    AGG is distributed in the hope that it will be useful,  but WITHOUT ANY WARRANTY; without even the implied warranty of  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the  GNU General Public License for more details.    You should have received a copy of the GNU General Public License  along with AGG; if not, write to the Free Software  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,   MA 02110-1301, USA.

See the details and full text at http://www.gnu.org/copyleft/gpl.html

The previous versions have more liberal licences that allow for free use in commercial software.

Commercial licensing is also available upon request.

AGG 2.4 Licenses

Anti-Grain Geometry Public License

Anti-Grain Geometry - Version 2.4 Copyright (C) 2002-2004 Maxim Shemanarev (McSeem) Permission to copy, use, modify, sell and distribute this software  is granted provided this copyright notice appears in all copies.  This software is provided "as is" without express or implied warranty, and with no claim as to its suitability for any purpose.

Modified BSD License

Anti-Grain Geometry - Version 2.4  Copyright (C) 2002-2005 Maxim Shemanarev (McSeem)  Redistribution and use in source and binary forms, with or without  modification, are permitted provided that the following conditions  are met:   1. Redistributions of source code must retain the above copyright       notice, this list of conditions and the following disclaimer.    2. Redistributions in binary form must reproduce the above copyright      notice, this list of conditions and the following disclaimer in       the documentation and/or other materials provided with the       distribution.    3. The name of the author may not be used to endorse or promote       products derived from this software without specific prior       written permission.  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE  ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING  IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE  POSSIBILITY OF SUCH DAMAGE.

Please mention the authors in any work derived from Anti-Grain Geometry.

General Polygon Clipper (GPC) License

Anti-Grain Geometry distribution package includes General Polygon Clipper (GPC) by Alan Murta. GPC has a different kind of license that allows you to use Alan's work for free only in non-commercial software. Below is the full text of it.

http://www.cs.man.ac.uk/aig/staff/alan/software/ Author:    Alan Murta (email: [email protected]) Version:   2.31 Date:      4th June 1999 Copyright: (C) 1997-1999, Advanced Interfaces Group,            University of Manchester.            This software is free for non-commercial use. It may be copied,            modified, and redistributed provided that this copyright notice            is preserved on all copies. The intellectual property rights of            the algorithms used reside with the University of Manchester            Advanced Interfaces Group.            You may not use this software, in whole or in part, in support            of any commercial product without the express consent of the            author.            There is no warranty or other guarantee of fitness of this            software for any purpose. It is provided solely "as is".

However GPC is not an obligatory part of AGG and can be easily removed. You just don't copy (or remove) agg2/gpc/* and you can also remove agg2/include/agg_conv_gpc.h in case if the GPC license does not allow you to use it.

GPC is a General Polygon Clipper that performs boolean operations on polygons (poly-polygons to be exact). In AGG you can get the same visual result using Scanline Boolean Algebra. It operates with scanline shapes and in average works 5-10 times faster than GPC. See: Demo scanline_boolean.cpp Demo scanline_boolean2.cpp

You need GPC if you really really want to have vector data in the ouput. For screen graphics of any kind Scanline Boolen Algebra is quite a good replacement.