mirror of
https://github.com/brl/mutter.git
synced 2024-11-22 08:00:42 -05:00
cogl: Add an internal CoglBitmask type
This implements a growable array of bits called CoglBitmask. The CoglBitmask is intended to be cheap if less than 32 bits are used. If more bits are required it will allocate a GArray. The type is meant to be allocated on the stack but because it can require additional resources it also has a destroy function. http://bugzilla.openedhand.com/show_bug.cgi?id=2132
This commit is contained in:
Neil Roberts
parent
52cbc93b18
commit
4fb784d111
@ -137,6 +137,8 @@ cogl_sources_c = \
|
||||
$(srcdir)/cogl-matrix-mesa.c \
|
||||
$(srcdir)/cogl-profile.h \
|
||||
$(srcdir)/cogl-profile.c \
|
||||
$(srcdir)/cogl-bitmask.h \
|
||||
$(srcdir)/cogl-bitmask.c \
|
||||
$(NULL)
|
||||
|
||||
# glib-mkenums rules
|
||||
|
||||
257
cogl/cogl-bitmask.c
Normal file
257
cogl/cogl-bitmask.c
Normal file
@ -0,0 +1,257 @@
|
||||
/*
|
||||
* 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, see <http://www.gnu.org/licenses/>.
|
||||
*
|
||||
*
|
||||
*
|
||||
* Authors:
|
||||
* Neil Roberts <neil@linux.intel.com>
|
||||
*/
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
#include "config.h"
|
||||
#endif
|
||||
|
||||
#include <glib.h>
|
||||
#include <string.h>
|
||||
|
||||
#include "cogl-bitmask.h"
|
||||
|
||||
gboolean
|
||||
_cogl_bitmask_get_from_array (const CoglBitmask *bitmask,
|
||||
unsigned int bit_num)
|
||||
{
|
||||
GArray *array = (GArray *) *bitmask;
|
||||
|
||||
/* If the index is off the end of the array then assume the bit is
|
||||
not set */
|
||||
if (bit_num >= sizeof (unsigned int) * 8 * array->len)
|
||||
return FALSE;
|
||||
else
|
||||
return !!(g_array_index (array, unsigned int,
|
||||
bit_num / (sizeof (unsigned int) * 8)) &
|
||||
(1 << (bit_num % (sizeof (unsigned int) * 8))));
|
||||
}
|
||||
|
||||
static void
|
||||
_cogl_bitmask_convert_to_array (CoglBitmask *bitmask)
|
||||
{
|
||||
GArray *array;
|
||||
/* Fetch the old values, ignoring the least significant bit */
|
||||
unsigned int old_values = GPOINTER_TO_UINT (*bitmask) >> 1;
|
||||
|
||||
array = g_array_new (FALSE, TRUE, sizeof (unsigned int));
|
||||
/* Copy the old values back in */
|
||||
g_array_append_val (array, old_values);
|
||||
|
||||
*bitmask = (struct _CoglBitmaskImaginaryType *) array;
|
||||
}
|
||||
|
||||
void
|
||||
_cogl_bitmask_set_in_array (CoglBitmask *bitmask,
|
||||
unsigned int bit_num,
|
||||
gboolean value)
|
||||
{
|
||||
GArray *array;
|
||||
unsigned int array_index, new_value_mask;
|
||||
|
||||
/* If the bitmask is not already an array then we need to allocate one */
|
||||
if (!_cogl_bitmask_has_array (bitmask))
|
||||
_cogl_bitmask_convert_to_array (bitmask);
|
||||
|
||||
array = (GArray *) *bitmask;
|
||||
|
||||
array_index = bit_num / (sizeof (unsigned int) * 8);
|
||||
/* Grow the array if necessary. This will clear the new data */
|
||||
if (array_index >= array->len)
|
||||
g_array_set_size (array, array_index + 1);
|
||||
|
||||
new_value_mask = 1 << (bit_num % (sizeof (unsigned int) * 8));
|
||||
|
||||
if (value)
|
||||
g_array_index (array, unsigned int, array_index) |= new_value_mask;
|
||||
else
|
||||
g_array_index (array, unsigned int, array_index) &= ~new_value_mask;
|
||||
}
|
||||
|
||||
void
|
||||
_cogl_bitmask_set_bits (CoglBitmask *dst,
|
||||
const CoglBitmask *src)
|
||||
{
|
||||
if (_cogl_bitmask_has_array (src))
|
||||
{
|
||||
GArray *src_array, *dst_array;
|
||||
int i;
|
||||
|
||||
if (!_cogl_bitmask_has_array (dst))
|
||||
_cogl_bitmask_convert_to_array (dst);
|
||||
|
||||
dst_array = (GArray *) *dst;
|
||||
src_array = (GArray *) *src;
|
||||
|
||||
if (dst_array->len < src_array->len)
|
||||
g_array_set_size (dst_array, src_array->len);
|
||||
|
||||
for (i = 0; i < src_array->len; i++)
|
||||
g_array_index (dst_array, unsigned int, i) |=
|
||||
g_array_index (src_array, unsigned int, i);
|
||||
}
|
||||
else if (_cogl_bitmask_has_array (dst))
|
||||
{
|
||||
GArray *dst_array;
|
||||
|
||||
dst_array = (GArray *) *dst;
|
||||
|
||||
g_array_index (dst_array, unsigned int, 0) |=
|
||||
(GPOINTER_TO_UINT (*src) >> 1);
|
||||
}
|
||||
else
|
||||
*dst = GUINT_TO_POINTER (GPOINTER_TO_UINT (*dst) |
|
||||
GPOINTER_TO_UINT (*src));
|
||||
}
|
||||
|
||||
void
|
||||
_cogl_bitmask_set_range_in_array (CoglBitmask *bitmask,
|
||||
unsigned int n_bits,
|
||||
gboolean value)
|
||||
{
|
||||
GArray *array;
|
||||
unsigned int array_index, bit_index;
|
||||
|
||||
if (n_bits == 0)
|
||||
return;
|
||||
|
||||
/* If the bitmask is not already an array then we need to allocate one */
|
||||
if (!_cogl_bitmask_has_array (bitmask))
|
||||
_cogl_bitmask_convert_to_array (bitmask);
|
||||
|
||||
array = (GArray *) *bitmask;
|
||||
|
||||
/* Get the array index of the top most value that will be touched */
|
||||
array_index = (n_bits - 1) / (sizeof (unsigned int) * 8);
|
||||
/* Get the bit index of the top most value */
|
||||
bit_index = (n_bits - 1) % (sizeof (unsigned int) * 8);
|
||||
/* Grow the array if necessary. This will clear the new data */
|
||||
if (array_index >= array->len)
|
||||
g_array_set_size (array, array_index + 1);
|
||||
|
||||
if (value)
|
||||
{
|
||||
/* Set the bits that are touching this index */
|
||||
g_array_index (array, unsigned int, array_index) |=
|
||||
~(unsigned int) 0 >> (sizeof (unsigned int) * 8 - 1 - bit_index);
|
||||
|
||||
/* Set all of the bits in any lesser indices */
|
||||
memset (array->data, 0xff, sizeof (unsigned int) * array_index);
|
||||
}
|
||||
else
|
||||
{
|
||||
/* Clear the bits that are touching this index */
|
||||
g_array_index (array, unsigned int, array_index) &=
|
||||
~(unsigned int) 1 << bit_index;
|
||||
|
||||
/* Clear all of the bits in any lesser indices */
|
||||
memset (array->data, 0x00, sizeof (unsigned int) * array_index);
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
_cogl_bitmask_clear_bits (CoglBitmask *dst,
|
||||
const CoglBitmask *src)
|
||||
{
|
||||
if (_cogl_bitmask_has_array (src))
|
||||
{
|
||||
GArray *src_array, *dst_array;
|
||||
int i;
|
||||
|
||||
if (!_cogl_bitmask_has_array (dst))
|
||||
_cogl_bitmask_convert_to_array (dst);
|
||||
|
||||
dst_array = (GArray *) *dst;
|
||||
src_array = (GArray *) *src;
|
||||
|
||||
if (dst_array->len < src_array->len)
|
||||
g_array_set_size (dst_array, src_array->len);
|
||||
|
||||
for (i = 0; i < src_array->len; i++)
|
||||
g_array_index (dst_array, unsigned int, i) &=
|
||||
~g_array_index (src_array, unsigned int, i);
|
||||
}
|
||||
else if (_cogl_bitmask_has_array (dst))
|
||||
{
|
||||
GArray *dst_array;
|
||||
|
||||
dst_array = (GArray *) *dst;
|
||||
|
||||
g_array_index (dst_array, unsigned int, 0) &=
|
||||
~(GPOINTER_TO_UINT (*src) >> 1);
|
||||
}
|
||||
else
|
||||
*dst = GUINT_TO_POINTER ((GPOINTER_TO_UINT (*dst) &
|
||||
~GPOINTER_TO_UINT (*src)) | 1);
|
||||
}
|
||||
|
||||
void
|
||||
_cogl_bitmask_clear_all_in_array (CoglBitmask *bitmask)
|
||||
{
|
||||
GArray *array = (GArray *) *bitmask;
|
||||
|
||||
memset (array->data, 0, sizeof (unsigned int) * array->len);
|
||||
}
|
||||
|
||||
void
|
||||
_cogl_bitmask_foreach (const CoglBitmask *bitmask,
|
||||
CoglBitmaskForeachFunc func,
|
||||
gpointer user_data)
|
||||
{
|
||||
if (_cogl_bitmask_has_array (bitmask))
|
||||
{
|
||||
GArray *array = (GArray *) *bitmask;
|
||||
int array_index;
|
||||
|
||||
for (array_index = 0; array_index < array->len; array_index++)
|
||||
{
|
||||
unsigned int mask = g_array_index (array, unsigned int, array_index);
|
||||
int bit = 0;
|
||||
|
||||
while (mask)
|
||||
{
|
||||
if (mask & 1)
|
||||
func (array_index * sizeof (unsigned int) * 8 + bit, user_data);
|
||||
|
||||
bit++;
|
||||
mask >>= 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
unsigned int mask = GPOINTER_TO_UINT (*bitmask) >> 1;
|
||||
int bit = 0;
|
||||
|
||||
while (mask)
|
||||
{
|
||||
if (mask & 1)
|
||||
func (bit, user_data);
|
||||
|
||||
bit++;
|
||||
mask >>= 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
223
cogl/cogl-bitmask.h
Normal file
223
cogl/cogl-bitmask.h
Normal file
@ -0,0 +1,223 @@
|
||||
/*
|
||||
* 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>
|
||||
|
||||
G_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 31 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)
|
||||
*/
|
||||
|
||||
typedef struct _CoglBitmaskImaginaryType *CoglBitmask;
|
||||
|
||||
/* 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) \
|
||||
(!(GPOINTER_TO_UINT (*bitmask) & 1))
|
||||
|
||||
/* Number of bits we can use before needing to allocate an array */
|
||||
#define COGL_BITMASK_MAX_DIRECT_BITS (sizeof (unsigned int) * 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
|
||||
*/
|
||||
/* Set the last significant bit to mark that no array has been
|
||||
allocated yet */
|
||||
#define _cogl_bitmask_init(bitmask) \
|
||||
G_STMT_START { *(bitmask) = GUINT_TO_POINTER (1); } G_STMT_END
|
||||
|
||||
gboolean
|
||||
_cogl_bitmask_get_from_array (const CoglBitmask *bitmask,
|
||||
unsigned int bit_num);
|
||||
|
||||
void
|
||||
_cogl_bitmask_set_in_array (CoglBitmask *bitmask,
|
||||
unsigned int bit_num,
|
||||
gboolean value);
|
||||
|
||||
void
|
||||
_cogl_bitmask_set_range_in_array (CoglBitmask *bitmask,
|
||||
unsigned int n_bits,
|
||||
gboolean value);
|
||||
|
||||
void
|
||||
_cogl_bitmask_clear_all_in_array (CoglBitmask *bitmask);
|
||||
|
||||
/*
|
||||
* 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_clear_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
|
||||
* cleared in @dst. Any unset bits in @src are left alone in @dst.
|
||||
*/
|
||||
void
|
||||
_cogl_bitmask_clear_bits (CoglBitmask *dst,
|
||||
const CoglBitmask *src);
|
||||
|
||||
typedef void (* CoglBitmaskForeachFunc) (int bit_num, gpointer 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,
|
||||
gpointer 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 gboolean
|
||||
_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 !!(GPOINTER_TO_UINT (*bitmask) & (1 << (bit_num + 1)));
|
||||
}
|
||||
|
||||
/*
|
||||
* _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, gboolean 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 = GUINT_TO_POINTER (GPOINTER_TO_UINT (*bitmask) |
|
||||
(1 << (bit_num + 1)));
|
||||
else
|
||||
*bitmask = GUINT_TO_POINTER (GPOINTER_TO_UINT (*bitmask) &
|
||||
~(1 << (bit_num + 1)));
|
||||
}
|
||||
|
||||
/*
|
||||
* _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,
|
||||
gboolean 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 = GUINT_TO_POINTER (GPOINTER_TO_UINT (*bitmask) |
|
||||
~(~(unsigned int) 1 << n_bits));
|
||||
else
|
||||
*bitmask = GUINT_TO_POINTER (GPOINTER_TO_UINT (*bitmask) &
|
||||
((~(unsigned int) 1 << n_bits) | 1));
|
||||
}
|
||||
|
||||
/*
|
||||
* _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 = GUINT_TO_POINTER (1);
|
||||
}
|
||||
|
||||
G_END_DECLS
|
||||
|
||||
#endif /* __COGL_BITMASK_H */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user