Skia 的 libgif 编解码器

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MPL-1.1 / GPL-2.0 / LGPL-2.1
============================
SkGifImageReader.cpp and SkGifImageReader.h:
    ***** BEGIN LICENSE BLOCK *****
    Version: MPL 1.1/GPL 2.0/LGPL 2.1
    The contents of this file are subject to the Mozilla Public License Version
    1.1 (the "License"); you may not use this file except in compliance with
    the License. You may obtain a copy of the License at
    http://www.mozilla.org/MPL/
    Software distributed under the License is distributed on an "AS IS" basis,
    WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
    for the specific language governing rights and limitations under the
    License.
    The Original Code is mozilla.org code.
    The Initial Developer of the Original Code is
    Netscape Communications Corporation.
    Portions created by the Initial Developer are Copyright (C) 1998
    the Initial Developer. All Rights Reserved.
    Contributor(s):
      Chris Saari <saari@netscape.com>
      Apple Computer
    Alternatively, the contents of this file may be used under the terms of
    either the GNU General Public License Version 2 or later (the "GPL"), or
    the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
    in which case the provisions of the GPL or the LGPL are applicable instead
    of those above. If you wish to allow use of your version of this file only
    under the terms of either the GPL or the LGPL, and not to allow others to
    use your version of this file under the terms of the MPL, indicate your
    decision by deleting the provisions above and replace them with the notice
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    the provisions above, a recipient may use your version of this file under
    the terms of any one of the MPL, the GPL or the LGPL.
    ***** END LICENSE BLOCK ***** * /
BSD 3 条款
============
libgifcodec.gni, SkGifCodec.h, SkLibGifCodec.cpp, SkLibGifCodec.h:
    Copyright 2019 Google LLC. All rights reserved.
    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are
    met:
      * Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer.
      * 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.
      * Neither the name of the copyright holder nor the names of its
        contributors may be used to endorse or promote products derived
        from this software without specific prior written permission.
    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    "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 COPYRIGHT
    OWNER OR CONTRIBUTORS 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.
BSD-2-Clause
============
SkLibGifCodec.cpp:
    Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
    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.
    THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. OR
    CONTRIBUTORS 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.