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gst-libs/gst/floatcast/floatcast.h: Don't include config.h in an installed public header, this might break compilatio...

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Original commit message from CVS:
* gst-libs/gst/floatcast/floatcast.h:
Don't include config.h in an installed public header, this
might break compilation of applications that don't have such
a header and doesn't necessarily do what it's supposed to do
anyway (ie. check for the lrint/lrintf defines) (#442065).
Add docs for the various macros and document how this header
has to be used (link against libm, etc.); add a few FIXMEs;
include math.h for non-c99 code path.  Based on patch by
Jan Schmidt.
This commit is contained in:
Tim-Philipp Müller 2007-09-25 11:54:09 +00:00
parent 61988a4b0c
commit 3f7d77fc29
2 changed files with 120 additions and 5 deletions
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12
ChangeLog
View file

@ -1,3 +1,15 @@
2007-09-25 Tim-Philipp Müller <tim at centricular dot net>
* gst-libs/gst/floatcast/floatcast.h:
Don't include config.h in an installed public header, this
might break compilation of applications that don't have such
a header and doesn't necessarily do what it's supposed to do
anyway (ie. check for the lrint/lrintf defines) (#442065).
Add docs for the various macros and document how this header
has to be used (link against libm, etc.); add a few FIXMEs;
include math.h for non-c99 code path. Based on patch by
Jan Schmidt.
2007-09-25 Sebastian Dröge <slomo@circular-chaos.org>
* configure.ac:

113
gst-libs/gst/floatcast/floatcast.h
View file

@ -21,15 +21,24 @@
/**
* SECTION:gstfloatcast
* @short_description: Floating point platform independence macros
*
* The floatcast.h header file contains a couple of convenience macros for
* floating point numbers.
*
* If you include this header, your application or library must link against
* libm (for maths.h support).
*
* For optimal results, your application&apos;s or library&apos;s build
* system should check whether the C99 functions lrint and lrintf are supported
* and define the preprocessor symbols HAVE_LRINT and HAVE_LRINTF if so. If
* you are using autoconf, you can do this by using the AC_C99_FUNC_LRINT and
* AC_C99_FUNC_LRINTF checks in your configure.ac or configure.in file and
* including your application's config.h header before you include floatcast.h.
*/
#ifndef __FLOATCAST_H__
#define __FLOATCAST_H__
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <glib/gtypes.h>
#include <glib/gutils.h> /* to make sure inline is defined properly */
@ -40,7 +49,26 @@
G_BEGIN_DECLS
#if (HAVE_LRINT && HAVE_LRINTF)
/* FIXME 0.11: these gst_cast_*() functions are not used anywhere, so we could
* just as well get rid of them and move the float/double swap macros into
* gstutils.h in core */
/**
* gst_cast_float:
* @x: input value
*
* Casts a 32-bit floating point value (float) to an integer without bias.
*/
/**
* gst_cast_double:
* @x: input value
*
* Casts a 64-bit floating point value (double) to an integer without bias.
*/
/* FIXME: HAVE_LRINT && HAVE_LRINTF are defined by config.h - they should
* not be used in an installed header. */
#if defined(HAVE_LRINT) && defined(HAVE_LRINTF)
/* These defines enable functionality introduced with the 1999 ISO C
** standard. They must be defined before the inclusion of math.h to
@ -61,12 +89,23 @@ G_BEGIN_DECLS
#define gst_cast_double(x) ((gint)lrint(x))
#else
#include <math.h>
/* use a standard c cast, but do rounding correctly */
#define gst_cast_float(x) ((gint)floor((x)+0.5))
#define gst_cast_double(x) ((gint)floor((x)+0.5))
#endif
/* FIXME 0.11: don't use GLib namespace (GDOUBLE_SWAP_LE_BE, GFLOAT_TO_LE,
* GFLOAT_TO_BE, GDOUBLE_TO_LE, GDOUBLE_TO_BE) */
/**
* GFLOAT_SWAP_LE_BE:
* @in: input value
*
* Swap byte order of a 32-bit floating point value (float).
*/
inline static gfloat
GFLOAT_SWAP_LE_BE(gfloat in)
{
@ -81,6 +120,12 @@ GFLOAT_SWAP_LE_BE(gfloat in)
return u.f;
}
/**
* GDOUBLE_SWAP_LE_BE:
* @in: input value
*
* Swap byte order of a 64-bit floating point value (double).
*/
inline static gdouble
GDOUBLE_SWAP_LE_BE(gdouble in)
{
@ -95,6 +140,64 @@ GDOUBLE_SWAP_LE_BE(gdouble in)
return u.d;
}
/**
* GDOUBLE_TO_LE:
* @val: value
*
* Convert 64-bit floating point value (double) from native byte order into
* little endian byte order.
*/
/**
* GDOUBLE_TO_BE:
* @val: value
*
* Convert 64-bit floating point value (double) from native byte order into
* big endian byte order.
*/
/**
* GDOUBLE_FROM_LE:
* @val: value
*
* Convert 64-bit floating point value (double) from little endian byte order
* into native byte order.
*/
/**
* GDOUBLE_FROM_BE:
* @val: value
*
* Convert 64-bit floating point value (double) from big endian byte order
* into native byte order.
*/
/**
* GFLOAT_TO_LE:
* @val: value
*
* Convert 32-bit floating point value (float) from native byte order into
* little endian byte order.
*/
/**
* GFLOAT_TO_BE:
* @val: value
*
* Convert 32-bit floating point value (float) from native byte order into
* big endian byte order.
*/
/**
* GFLOAT_FROM_LE:
* @val: value
*
* Convert 32-bit floating point value (float) from little endian byte order
* into native byte order.
*/
/**
* GFLOAT_FROM_BE:
* @val: value
*
* Convert 32-bit floating point value (float) from big endian byte order
* into native byte order.
*/
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#define GFLOAT_TO_LE(val) ((gfloat) (val))
#define GFLOAT_TO_BE(val) (GFLOAT_SWAP_LE_BE (val))