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109 lines
3.3 KiB
C++
109 lines
3.3 KiB
C++
/* -*- Mode: c++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Corporation code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (Sub) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Jeff Muizelaar <jmuizelaar@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include <stdlib.h>
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#include "mozilla/mozalloc.h"
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namespace mozilla {
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namespace gfx {
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struct UserDataKey {
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int unused;
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};
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/* this class is basically a clone of the user data concept from cairo */
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class UserData
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{
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typedef void (*destroyFunc)(void *data);
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public:
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UserData() : count(0), entries(NULL) {}
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/* Attaches untyped userData associated with key. destroy is called on destruction */
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void Add(UserDataKey *key, void *userData, destroyFunc destroy)
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{
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// We could keep entries in a std::vector instead of managing it by hand
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// but that would propagate an stl dependency out which we'd rather not
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// do (see bug 666609). Plus, the entries array is expect to stay small
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// so doing a realloc everytime we add a new entry shouldn't be too costly
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entries = static_cast<Entry*>(moz_xrealloc(entries, sizeof(Entry)*(count+1)));
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entries[count].key = key;
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entries[count].userData = userData;
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entries[count].destroy = destroy;
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count++;
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}
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//XXX: we probably want to add a way to remove Keys
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/* Retrives the userData for the associated key */
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void *Get(UserDataKey *key)
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{
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for (int i=0; i<count; i++) {
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if (key == entries[i].key) {
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return entries[i].userData;
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}
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}
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return NULL;
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}
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~UserData()
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{
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for (int i=0; i<count; i++) {
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entries[i].destroy(entries[i].userData);
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}
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free(entries);
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}
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private:
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struct Entry {
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const UserDataKey *key;
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void *userData;
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destroyFunc destroy;
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};
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int count;
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Entry *entries;
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};
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}
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}
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