cogl: Add an internal utility to maintain a list of callback functions

This adds an internal CoglCallbackList type which is just a GSList of
of function pointers along with a data pointer to form a
closure. There are functions to add and remove items and to invoke the
list of functions. This could be used in a number of places in Cogl.
This commit is contained in:
Neil Roberts 2010-08-04 17:59:06 +01:00
parent 4989000f55
commit 0c8582aad8
3 changed files with 167 additions and 0 deletions

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@ -162,6 +162,8 @@ cogl_sources_c = \
$(srcdir)/cogl-bitmask.c \
$(srcdir)/cogl-shader-private.h \
$(srcdir)/cogl-shader.c \
$(srcdir)/cogl-callback-list.h \
$(srcdir)/cogl-callback-list.c \
$(NULL)
# glib-mkenums rules

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@ -0,0 +1,107 @@
/*
* 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>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl.h"
#include "cogl-callback-list.h"
typedef struct _CoglCallbackListClosure
{
CoglCallbackListFunc func;
void *user_data;
} CoglCallbackListClosure;
void
_cogl_callback_list_init (CoglCallbackList *list)
{
list->funcs = NULL;
}
void
_cogl_callback_list_destroy (CoglCallbackList *list)
{
while (list->funcs)
{
CoglCallbackListClosure *closure = list->funcs->data;
_cogl_callback_list_remove (list, closure->func, closure->user_data);
}
}
void
_cogl_callback_list_add (CoglCallbackList *list,
CoglCallbackListFunc func,
void *user_data)
{
CoglCallbackListClosure *closure = g_slice_new (CoglCallbackListClosure);
closure->func = func;
closure->user_data = user_data;
list->funcs = g_slist_prepend (list->funcs, closure);
}
void
_cogl_callback_list_remove (CoglCallbackList *list,
CoglCallbackListFunc func,
void *user_data)
{
GSList *prev = NULL, *l;
for (l = list->funcs; l; l = l->next)
{
CoglCallbackListClosure *closure = l->data;
if (closure->func == func && closure->user_data == user_data)
{
g_slice_free (CoglCallbackListClosure, closure);
if (prev)
prev->next = g_slist_delete_link (prev->next, l);
else
list->funcs = g_slist_delete_link (list->funcs, l);
break;
}
prev = l;
}
}
void
_cogl_callback_list_invoke (CoglCallbackList *list)
{
GSList *l;
for (l = list->funcs; l; l = l->next)
{
CoglCallbackListClosure *closure = l->data;
closure->func (closure->user_data);
}
}

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@ -0,0 +1,58 @@
/*
* 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/>.
*
*/
#ifndef __COGL_CALLBACK_LIST_H__
#define __COGL_CALLBACK_LIST_H__
#include <glib.h>
G_BEGIN_DECLS
typedef void (* CoglCallbackListFunc) (void *user_data);
typedef struct _CoglCallbackList
{
GSList *funcs;
} CoglCallbackList;
void
_cogl_callback_list_init (CoglCallbackList *list);
void
_cogl_callback_list_add (CoglCallbackList *list,
CoglCallbackListFunc func,
void *user_data);
void
_cogl_callback_list_remove (CoglCallbackList *list,
CoglCallbackListFunc func,
void *user_data);
void
_cogl_callback_list_invoke (CoglCallbackList *list);
void
_cogl_callback_list_destroy (CoglCallbackList *list);
G_END_DECLS
#endif /* __COGL_CALLBACK_LIST_H__ */