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 = \
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$(srcdir)/cogl-matrix-mesa.c \
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$(srcdir)/cogl-matrix-mesa.c \
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$(srcdir)/cogl-profile.h \
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$(srcdir)/cogl-profile.h \
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$(srcdir)/cogl-profile.c \
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$(srcdir)/cogl-profile.c \
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$(srcdir)/cogl-bitmask.h \
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$(srcdir)/cogl-bitmask.c \
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$(NULL)
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$(NULL)
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# glib-mkenums rules
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# glib-mkenums rules
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257
cogl/cogl-bitmask.c
Normal file
257
cogl/cogl-bitmask.c
Normal file
@ -0,0 +1,257 @@
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/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2010 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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*
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* Authors:
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* Neil Roberts <neil@linux.intel.com>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <glib.h>
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#include <string.h>
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#include "cogl-bitmask.h"
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gboolean
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_cogl_bitmask_get_from_array (const CoglBitmask *bitmask,
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unsigned int bit_num)
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{
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GArray *array = (GArray *) *bitmask;
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/* If the index is off the end of the array then assume the bit is
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not set */
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if (bit_num >= sizeof (unsigned int) * 8 * array->len)
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return FALSE;
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else
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return !!(g_array_index (array, unsigned int,
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bit_num / (sizeof (unsigned int) * 8)) &
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(1 << (bit_num % (sizeof (unsigned int) * 8))));
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}
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static void
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_cogl_bitmask_convert_to_array (CoglBitmask *bitmask)
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{
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GArray *array;
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/* Fetch the old values, ignoring the least significant bit */
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unsigned int old_values = GPOINTER_TO_UINT (*bitmask) >> 1;
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array = g_array_new (FALSE, TRUE, sizeof (unsigned int));
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/* Copy the old values back in */
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g_array_append_val (array, old_values);
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*bitmask = (struct _CoglBitmaskImaginaryType *) array;
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}
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void
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_cogl_bitmask_set_in_array (CoglBitmask *bitmask,
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unsigned int bit_num,
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gboolean value)
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{
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GArray *array;
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unsigned int array_index, new_value_mask;
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/* If the bitmask is not already an array then we need to allocate one */
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if (!_cogl_bitmask_has_array (bitmask))
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_cogl_bitmask_convert_to_array (bitmask);
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array = (GArray *) *bitmask;
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array_index = bit_num / (sizeof (unsigned int) * 8);
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/* Grow the array if necessary. This will clear the new data */
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if (array_index >= array->len)
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g_array_set_size (array, array_index + 1);
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new_value_mask = 1 << (bit_num % (sizeof (unsigned int) * 8));
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if (value)
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g_array_index (array, unsigned int, array_index) |= new_value_mask;
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else
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g_array_index (array, unsigned int, array_index) &= ~new_value_mask;
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}
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void
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_cogl_bitmask_set_bits (CoglBitmask *dst,
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const CoglBitmask *src)
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{
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if (_cogl_bitmask_has_array (src))
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{
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GArray *src_array, *dst_array;
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int i;
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if (!_cogl_bitmask_has_array (dst))
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_cogl_bitmask_convert_to_array (dst);
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dst_array = (GArray *) *dst;
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src_array = (GArray *) *src;
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if (dst_array->len < src_array->len)
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g_array_set_size (dst_array, src_array->len);
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for (i = 0; i < src_array->len; i++)
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g_array_index (dst_array, unsigned int, i) |=
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g_array_index (src_array, unsigned int, i);
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}
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else if (_cogl_bitmask_has_array (dst))
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{
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GArray *dst_array;
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dst_array = (GArray *) *dst;
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g_array_index (dst_array, unsigned int, 0) |=
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(GPOINTER_TO_UINT (*src) >> 1);
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}
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else
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*dst = GUINT_TO_POINTER (GPOINTER_TO_UINT (*dst) |
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GPOINTER_TO_UINT (*src));
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}
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void
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_cogl_bitmask_set_range_in_array (CoglBitmask *bitmask,
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unsigned int n_bits,
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gboolean value)
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{
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GArray *array;
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unsigned int array_index, bit_index;
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if (n_bits == 0)
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return;
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/* If the bitmask is not already an array then we need to allocate one */
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if (!_cogl_bitmask_has_array (bitmask))
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_cogl_bitmask_convert_to_array (bitmask);
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array = (GArray *) *bitmask;
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/* Get the array index of the top most value that will be touched */
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array_index = (n_bits - 1) / (sizeof (unsigned int) * 8);
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/* Get the bit index of the top most value */
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bit_index = (n_bits - 1) % (sizeof (unsigned int) * 8);
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/* Grow the array if necessary. This will clear the new data */
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if (array_index >= array->len)
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g_array_set_size (array, array_index + 1);
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if (value)
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{
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/* Set the bits that are touching this index */
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g_array_index (array, unsigned int, array_index) |=
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~(unsigned int) 0 >> (sizeof (unsigned int) * 8 - 1 - bit_index);
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/* Set all of the bits in any lesser indices */
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memset (array->data, 0xff, sizeof (unsigned int) * array_index);
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}
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else
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{
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/* Clear the bits that are touching this index */
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g_array_index (array, unsigned int, array_index) &=
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~(unsigned int) 1 << bit_index;
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/* Clear all of the bits in any lesser indices */
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memset (array->data, 0x00, sizeof (unsigned int) * array_index);
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}
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}
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void
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_cogl_bitmask_clear_bits (CoglBitmask *dst,
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const CoglBitmask *src)
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{
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if (_cogl_bitmask_has_array (src))
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{
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GArray *src_array, *dst_array;
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int i;
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if (!_cogl_bitmask_has_array (dst))
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_cogl_bitmask_convert_to_array (dst);
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dst_array = (GArray *) *dst;
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src_array = (GArray *) *src;
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if (dst_array->len < src_array->len)
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g_array_set_size (dst_array, src_array->len);
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for (i = 0; i < src_array->len; i++)
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g_array_index (dst_array, unsigned int, i) &=
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~g_array_index (src_array, unsigned int, i);
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}
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else if (_cogl_bitmask_has_array (dst))
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{
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GArray *dst_array;
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dst_array = (GArray *) *dst;
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g_array_index (dst_array, unsigned int, 0) &=
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~(GPOINTER_TO_UINT (*src) >> 1);
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}
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else
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*dst = GUINT_TO_POINTER ((GPOINTER_TO_UINT (*dst) &
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~GPOINTER_TO_UINT (*src)) | 1);
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}
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void
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_cogl_bitmask_clear_all_in_array (CoglBitmask *bitmask)
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{
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GArray *array = (GArray *) *bitmask;
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memset (array->data, 0, sizeof (unsigned int) * array->len);
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}
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void
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_cogl_bitmask_foreach (const CoglBitmask *bitmask,
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CoglBitmaskForeachFunc func,
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gpointer user_data)
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{
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if (_cogl_bitmask_has_array (bitmask))
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{
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GArray *array = (GArray *) *bitmask;
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int array_index;
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for (array_index = 0; array_index < array->len; array_index++)
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{
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unsigned int mask = g_array_index (array, unsigned int, array_index);
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int bit = 0;
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while (mask)
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{
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if (mask & 1)
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func (array_index * sizeof (unsigned int) * 8 + bit, user_data);
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bit++;
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mask >>= 1;
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}
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}
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}
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else
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{
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unsigned int mask = GPOINTER_TO_UINT (*bitmask) >> 1;
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int bit = 0;
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while (mask)
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{
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if (mask & 1)
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func (bit, user_data);
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bit++;
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mask >>= 1;
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}
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}
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}
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223
cogl/cogl-bitmask.h
Normal file
223
cogl/cogl-bitmask.h
Normal file
@ -0,0 +1,223 @@
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/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2010 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Authors:
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* Neil Roberts <neil@linux.intel.com>
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*/
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#ifndef __COGL_BITMASK_H
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#define __COGL_BITMASK_H
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#include <glib.h>
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G_BEGIN_DECLS
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/*
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* CoglBitmask implements a growable array of bits. A CoglBitmask can
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* be allocated on the stack but it must be initialised with
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* _cogl_bitmask_init() before use and then destroyed with
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* _cogl_bitmask_destroy(). A CoglBitmask will try to avoid allocating
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* any memory unless more than 31 bits are needed.
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*
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* Internally a CoglBitmask is a pointer. If the least significant bit
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* of the pointer is 1 then the rest of the bits are directly used as
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* part of the bitmask, otherwise it is a pointer to a GArray of
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* unsigned ints. This relies on the fact the g_malloc will return a
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* pointer aligned to at least two bytes (so that the least
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* significant bit of the address is always 0)
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*/
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typedef struct _CoglBitmaskImaginaryType *CoglBitmask;
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/* Internal helper macro to determine whether this bitmask has a
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GArray allocated or whether the pointer is just used directly */
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#define _cogl_bitmask_has_array(bitmask) \
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(!(GPOINTER_TO_UINT (*bitmask) & 1))
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/* Number of bits we can use before needing to allocate an array */
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#define COGL_BITMASK_MAX_DIRECT_BITS (sizeof (unsigned int) * 8 - 1)
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/*
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* _cogl_bitmask_init:
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* @bitmask: A pointer to a bitmask
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*
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* Initialises the cogl bitmask. This must be called before any other
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* bitmask functions are called. Initially all of the values are
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* zero
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*/
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/* Set the last significant bit to mark that no array has been
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allocated yet */
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#define _cogl_bitmask_init(bitmask) \
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G_STMT_START { *(bitmask) = GUINT_TO_POINTER (1); } G_STMT_END
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gboolean
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_cogl_bitmask_get_from_array (const CoglBitmask *bitmask,
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unsigned int bit_num);
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void
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_cogl_bitmask_set_in_array (CoglBitmask *bitmask,
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unsigned int bit_num,
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gboolean value);
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void
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_cogl_bitmask_set_range_in_array (CoglBitmask *bitmask,
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unsigned int n_bits,
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gboolean value);
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void
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_cogl_bitmask_clear_all_in_array (CoglBitmask *bitmask);
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/*
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* cogl_bitmask_set_bits:
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* @dst: The bitmask to modify
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* @src: The bitmask to copy bits from
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*
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* This makes sure that all of the bits that are set in @src are also
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* set in @dst. Any unset bits in @src are left alone in @dst.
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*/
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void
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_cogl_bitmask_set_bits (CoglBitmask *dst,
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const CoglBitmask *src);
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/*
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* cogl_bitmask_clear_bits:
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* @dst: The bitmask to modify
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* @src: The bitmask to copy bits from
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*
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* This makes sure that all of the bits that are set in @src are
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* cleared in @dst. Any unset bits in @src are left alone in @dst.
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*/
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void
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_cogl_bitmask_clear_bits (CoglBitmask *dst,
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const CoglBitmask *src);
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typedef void (* CoglBitmaskForeachFunc) (int bit_num, gpointer user_data);
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/*
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||||||
|
* 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