Merge branch 'giflib' into 'master'

Include copy of GifQuantizeBuffer function from giflib

See merge request !45

bob/io/image/cpp/gif.cpp

@@ -25,6 +25,13 @@
 
 extern "C" {
 #include <gif_lib.h>
+
+#if GIFLIB_MAJOR > 5 || GIFLIB_MAJOR == 5 && GIFLIB_MINOR >= 2 || GIFLIB_MAJOR == 5 && GIFLIB_MINOR == 1 && GIFLIB_RELEASE >= 9
+//see https://sourceforge.net/p/giflib/bugs/132/
+//and https://sourceforge.net/p/giflib/bugs/142/
+#include <quantize.h>
+#endif
+
 }
 
 // QuantizeBuffer function definition that was inlined (only) in giflib 4.2

bob/io/image/giflib/COPYING

+The GIFLIB distribution is Copyright (c) 1997  Eric S. Raymond
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

bob/io/image/giflib/quantize.h

+/***************************************************************************
+
+getarg.h - Support routines for the giflib utilities
+
+SPDX-License-Identifier: MIT
+
+**************************************************************************/
+
+#ifndef QUANTIZE_H
+#define QUANTIZE_H
+
+#include <gif_lib.h>
+
+/******************************************************************************
+ Color table quantization
+******************************************************************************/
+int GifQuantizeBuffer(unsigned int Width, unsigned int Height,
+                   int *ColorMapSize, GifByteType * RedInput,
+                   GifByteType * GreenInput, GifByteType * BlueInput,
+                   GifByteType * OutputBuffer,
+                   GifColorType * OutputColorMap);
+
+#endif /*QUANTIZE_H */
+
+/* end */

setup.py

@@ -10,6 +10,7 @@ from setuptools import setup, find_packages, dist
 dist.Distribution(dict(setup_requires=['bob.extension', 'bob.blitz'] + bob_packages))
 from bob.extension.utils import egrep, find_header, find_library
 from bob.blitz.extension import Extension, Library, build_ext
+from distutils.version import LooseVersion
 
 from bob.extension.utils import load_requirements
 build_requires = load_requirements()
@@ -334,6 +335,8 @@ system_include_dirs = [
     tiff_pkg.include_directory,
     gif_pkg.include_directory,
     ]
+if LooseVersion(gif_pkg.version) >= LooseVersion("5.1.9"):
+  system_include_dirs.append("bob/io/image/giflib")
 
 library_dirs = [
     jpeg_pkg.library_directory,