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gst: add math-compat.h header

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Add minimal math-compath.h header where we can define fallback
versions for miscellaneous math functions that aren't always
available, so we don't have to duplicate this in plugins.
The header is not included by default, so needs to be
included explicitly for now.

https://bugzilla.gnome.org/show_bug.cgi?id=630802
This commit is contained in:
Tim-Philipp Müller 2010-10-05 14:16:19 +01:00
parent 0f896f8ab0
commit 2797f74c84
3 changed files with 85 additions and 1 deletions
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1
docs/gst/Makefile.am
View file

@ -73,6 +73,7 @@ IGNORE_HFILES= \
\
grammar.tab.h \
grammar.tab.pre.h \
math-compat.h \
types.h
gst-universe.svg: gst-universe.dot

3
gst/Makefile.am
View file

@ -196,7 +196,8 @@ gst_headers = \
gstparse.h \
gstxml.h
libgstreamer_@GST_MAJORMINOR@include_HEADERS = $(gst_headers)
libgstreamer_@GST_MAJORMINOR@include_HEADERS = $(gst_headers) math-compat.h
nodist_libgstreamer_@GST_MAJORMINOR@include_HEADERS = \
$(built_header_configure) $(built_header_make)

82
gst/math-compat.h Normal file
View file

@ -0,0 +1,82 @@
/* GStreamer
* Copyright (C) 2010 Tim-Philipp Müller <tim centricular net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_MATH_COMPAT_H__
#define __GST_MATH_COMPAT_H__
/* This header is not included automatically via gst/gst.h, you need to
* include it explicitly if you need it. */
#define _USE_MATH_DEFINES /* so MSVC defines M_PI etc. */
#include <math.h>
#include <glib.h>
G_BEGIN_DECLS
/* http://en.wikipedia.org/wiki/Math.h */
#define __GST_MATH_COMPAT_NEED_RINT
#define __GST_MATH_COMPAT_NEED_RINTF
#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
#undef __GST_MATH_COMPAT_NEED_RINT
#undef __GST_MATH_COMPAT_NEED_RINTF
#endif
#if defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L
#undef __GST_MATH_COMPAT_NEED_RINT
#undef __GST_MATH_COMPAT_NEED_RINTF
#endif
#ifndef M_PI
#define M_PI G_PI
#endif
#ifndef M_PI_2
#define M_PI_2 G_PI_2
#endif
#ifndef M_PI_4
#define M_PI_4 G_PI_4
#endif
static inline double
__gst_math_compat_rint (double x)
{
return floor (x + 0.5);
}
static inline float
__gst_math_compat_rintf (float x)
{
return floorf (x + 0.5);
}
#if defined (__GST_MATH_COMPAT_NEED_RINT) && !defined (rint)
#define rint(x) __gst_math_compat_rint(x)
#endif
#if defined (__GST_MATH_COMPAT_NEED_RINTF) && !defined (rintf)
#define rintf(x) __gst_math_compat_rintf(x)
#endif
G_END_DECLS
#endif /* __GST_MATH_COMPAT_H__ */