mutter/cogl/cogl-bitmask.h
Neil Roberts 4f6fe6f0e2 Fixes for --disable-glib
This fixes some problems which were stopping --disable-glib from
working properly:

• A lot of the public headers were including glib.h. This shouldn't be
  necessary because the API doesn't expose any glib types. Otherwise
  any apps would require glib in order to get the header.

• The public headers were using G_BEGIN_DECLS. There is now a
  replacement macro called COGL_BEGIN_DECLS which is defined in
  cogl-types.h.

• A similar fix has been done for G_GNUC_NULL_TERMINATED and
  G_GNUC_DEPRECATED.

• The CFLAGS were not including $(builddir)/deps/glib which was
  preventing it finding the generated glibconfig.h when building out
  of tree.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit 4138b3141c2f39cddaea3d72bfc04342ed5092d0)
2013-01-22 17:48:05 +00:00

308 lines
9.3 KiB
C

/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2010 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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.
*
* Authors:
* Neil Roberts <neil@linux.intel.com>
*/
#ifndef __COGL_BITMASK_H
#define __COGL_BITMASK_H
#include <glib.h>
#include "cogl-util.h"
COGL_BEGIN_DECLS
/*
* CoglBitmask implements a growable array of bits. A CoglBitmask can
* be allocated on the stack but it must be initialised with
* _cogl_bitmask_init() before use and then destroyed with
* _cogl_bitmask_destroy(). A CoglBitmask will try to avoid allocating
* any memory unless more than the number of bits in a long - 1 bits
* are needed.
*
* Internally a CoglBitmask is a pointer. If the least significant bit
* of the pointer is 1 then the rest of the bits are directly used as
* part of the bitmask, otherwise it is a pointer to a GArray of
* unsigned ints. This relies on the fact the g_malloc will return a
* pointer aligned to at least two bytes (so that the least
* significant bit of the address is always 0). It also assumes that
* the size of a pointer is always greater than or equal to the size
* of a long (although there is a compile time assert to verify this).
*
* If the maximum possible bit number in the set is known at compile
* time, it may make more sense to use the macros in cogl-flags.h
* instead of this type.
*/
typedef struct _CoglBitmaskImaginaryType *CoglBitmask;
/* These are internal helper macros */
#define _cogl_bitmask_to_number(bitmask) \
((unsigned long) (*bitmask))
#define _cogl_bitmask_to_bits(bitmask) \
(_cogl_bitmask_to_number (bitmask) >> 1UL)
/* The least significant bit is set to mark that no array has been
allocated yet */
#define _cogl_bitmask_from_bits(bits) \
((void *) ((((unsigned long) (bits)) << 1UL) | 1UL))
/* Internal helper macro to determine whether this bitmask has a
GArray allocated or whether the pointer is just used directly */
#define _cogl_bitmask_has_array(bitmask) \
(!(_cogl_bitmask_to_number (bitmask) & 1UL))
/* Number of bits we can use before needing to allocate an array */
#define COGL_BITMASK_MAX_DIRECT_BITS (sizeof (unsigned long) * 8 - 1)
/*
* _cogl_bitmask_init:
* @bitmask: A pointer to a bitmask
*
* Initialises the cogl bitmask. This must be called before any other
* bitmask functions are called. Initially all of the values are
* zero
*/
#define _cogl_bitmask_init(bitmask) \
G_STMT_START { *(bitmask) = _cogl_bitmask_from_bits (0); } G_STMT_END
CoglBool
_cogl_bitmask_get_from_array (const CoglBitmask *bitmask,
unsigned int bit_num);
void
_cogl_bitmask_set_in_array (CoglBitmask *bitmask,
unsigned int bit_num,
CoglBool value);
void
_cogl_bitmask_set_range_in_array (CoglBitmask *bitmask,
unsigned int n_bits,
CoglBool value);
void
_cogl_bitmask_clear_all_in_array (CoglBitmask *bitmask);
void
_cogl_bitmask_set_flags_array (const CoglBitmask *bitmask,
unsigned long *flags);
int
_cogl_bitmask_popcount_in_array (const CoglBitmask *bitmask);
int
_cogl_bitmask_popcount_upto_in_array (const CoglBitmask *bitmask,
int upto);
/*
* cogl_bitmask_set_bits:
* @dst: The bitmask to modify
* @src: The bitmask to copy bits from
*
* This makes sure that all of the bits that are set in @src are also
* set in @dst. Any unset bits in @src are left alone in @dst.
*/
void
_cogl_bitmask_set_bits (CoglBitmask *dst,
const CoglBitmask *src);
/*
* cogl_bitmask_xor_bits:
* @dst: The bitmask to modify
* @src: The bitmask to copy bits from
*
* For every bit that is set in src, the corresponding bit in dst is
* inverted.
*/
void
_cogl_bitmask_xor_bits (CoglBitmask *dst,
const CoglBitmask *src);
/* The foreach function can return FALSE to stop iteration */
typedef CoglBool (* CoglBitmaskForeachFunc) (int bit_num, void *user_data);
/*
* cogl_bitmask_foreach:
* @bitmask: A pointer to a bitmask
* @func: A callback function
* @user_data: A pointer to pass to the callback
*
* This calls @func for each bit that is set in @bitmask.
*/
void
_cogl_bitmask_foreach (const CoglBitmask *bitmask,
CoglBitmaskForeachFunc func,
void *user_data);
/*
* _cogl_bitmask_get:
* @bitmask: A pointer to a bitmask
* @bit_num: A bit number
*
* Return value: whether bit number @bit_num is set in @bitmask
*/
static inline CoglBool
_cogl_bitmask_get (const CoglBitmask *bitmask, unsigned int bit_num)
{
if (_cogl_bitmask_has_array (bitmask))
return _cogl_bitmask_get_from_array (bitmask, bit_num);
else if (bit_num >= COGL_BITMASK_MAX_DIRECT_BITS)
return FALSE;
else
return !!(_cogl_bitmask_to_bits (bitmask) & (1UL << bit_num));
}
/*
* _cogl_bitmask_set:
* @bitmask: A pointer to a bitmask
* @bit_num: A bit number
* @value: The new value
*
* Sets or resets a bit number @bit_num in @bitmask according to @value.
*/
static inline void
_cogl_bitmask_set (CoglBitmask *bitmask, unsigned int bit_num, CoglBool value)
{
if (_cogl_bitmask_has_array (bitmask) ||
bit_num >= COGL_BITMASK_MAX_DIRECT_BITS)
_cogl_bitmask_set_in_array (bitmask, bit_num, value);
else if (value)
*bitmask = _cogl_bitmask_from_bits (_cogl_bitmask_to_bits (bitmask) |
(1UL << bit_num));
else
*bitmask = _cogl_bitmask_from_bits (_cogl_bitmask_to_bits (bitmask) &
~(1UL << bit_num));
}
/*
* _cogl_bitmask_set_range:
* @bitmask: A pointer to a bitmask
* @n_bits: The number of bits to set
* @value: The value to set
*
* Sets the first @n_bits in @bitmask to @value.
*/
static inline void
_cogl_bitmask_set_range (CoglBitmask *bitmask,
unsigned int n_bits,
CoglBool value)
{
if (_cogl_bitmask_has_array (bitmask) ||
n_bits > COGL_BITMASK_MAX_DIRECT_BITS)
_cogl_bitmask_set_range_in_array (bitmask, n_bits, value);
else if (value)
*bitmask = _cogl_bitmask_from_bits (_cogl_bitmask_to_bits (bitmask) |
~(~0UL << n_bits));
else
*bitmask = _cogl_bitmask_from_bits (_cogl_bitmask_to_bits (bitmask) &
(~0UL << n_bits));
}
/*
* _cogl_bitmask_destroy:
* @bitmask: A pointer to a bitmask
*
* Destroys any resources allocated by the bitmask
*/
static inline void
_cogl_bitmask_destroy (CoglBitmask *bitmask)
{
if (_cogl_bitmask_has_array (bitmask))
g_array_free ((GArray *) *bitmask, TRUE);
}
/*
* _cogl_bitmask_clear_all:
* @bitmask: A pointer to a bitmask
*
* Clears all the bits in a bitmask without destroying any resources.
*/
static inline void
_cogl_bitmask_clear_all (CoglBitmask *bitmask)
{
if (_cogl_bitmask_has_array (bitmask))
_cogl_bitmask_clear_all_in_array (bitmask);
else
*bitmask = _cogl_bitmask_from_bits (0);
}
/*
* _cogl_bitmask_set_flags:
* @bitmask: A pointer to a bitmask
* @flags: An array of flags
*
* Bitwise or's the bits from @bitmask into the flags array (see
* cogl-flags) pointed to by @flags.
*/
static inline void
_cogl_bitmask_set_flags (const CoglBitmask *bitmask,
unsigned long *flags)
{
if (_cogl_bitmask_has_array (bitmask))
_cogl_bitmask_set_flags_array (bitmask, flags);
else
flags[0] |= _cogl_bitmask_to_bits (bitmask);
}
/*
* _cogl_bitmask_popcount:
* @bitmask: A pointer to a bitmask
*
* Counts the number of bits that are set in the bitmask.
*
* Return value: the number of bits set in @bitmask.
*/
static inline int
_cogl_bitmask_popcount (const CoglBitmask *bitmask)
{
return (_cogl_bitmask_has_array (bitmask) ?
_cogl_bitmask_popcount_in_array (bitmask) :
_cogl_util_popcountl (_cogl_bitmask_to_bits (bitmask)));
}
/*
* _cogl_bitmask_popcount:
* @Bitmask: A pointer to a bitmask
* @upto: The maximum bit index to consider
*
* Counts the number of bits that are set and have an index which is
* less than @upto.
*
* Return value: the number of bits set in @bitmask that are less than @upto.
*/
static inline int
_cogl_bitmask_popcount_upto (const CoglBitmask *bitmask,
int upto)
{
if (_cogl_bitmask_has_array (bitmask))
return _cogl_bitmask_popcount_upto_in_array (bitmask, upto);
else if (upto >= COGL_BITMASK_MAX_DIRECT_BITS)
return _cogl_util_popcountl (_cogl_bitmask_to_bits (bitmask));
else
return _cogl_util_popcountl (_cogl_bitmask_to_bits (bitmask) &
((1UL << upto) - 1));
}
COGL_END_DECLS
#endif /* __COGL_BITMASK_H */