LCOV - code coverage report
Current view: directory - objdir/dist/include/mozilla/gfx - UserData.h (source / functions) Found Hit Coverage
Test: app.info Lines: 27 0 0.0 %
Date: 2012-06-02 Functions: 5 0 0.0 %

       1                 : /* -*- Mode: c++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
       2                 :  * ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is Mozilla Corporation code.
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is Mozilla Foundation.
      18                 :  * Portions created by the Initial Developer are Copyright (Sub) 2011
      19                 :  * the Initial Developer. All Rights Reserved.
      20                 :  *
      21                 :  * Contributor(s):
      22                 :  *   Jeff Muizelaar <jmuizelaar@mozilla.com>
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      26                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : #ifndef MOZILLA_GFX_USERDATA_H_
      39                 : #define MOZILLA_GFX_USERDATA_H_
      40                 : 
      41                 : #include <stdlib.h>
      42                 : #include "mozilla/mozalloc.h"
      43                 : 
      44                 : namespace mozilla {
      45                 : namespace gfx {
      46                 : 
      47                 : struct UserDataKey {
      48                 :   int unused;
      49                 : };
      50                 : 
      51                 : /* this class is basically a clone of the user data concept from cairo */
      52                 : class UserData
      53                 : {
      54                 :   typedef void (*destroyFunc)(void *data);
      55                 : public:
      56               0 :   UserData() : count(0), entries(NULL) {}
      57                 : 
      58                 :   /* Attaches untyped userData associated with key. destroy is called on destruction */
      59               0 :   void Add(UserDataKey *key, void *userData, destroyFunc destroy)
      60                 :   {
      61                 :     // XXX we should really warn if user data with key has already been added,
      62                 :     // since in that case Get() will return the old user data!
      63                 : 
      64                 :     // We could keep entries in a std::vector instead of managing it by hand
      65                 :     // but that would propagate an stl dependency out which we'd rather not
      66                 :     // do (see bug 666609). Plus, the entries array is expect to stay small
      67                 :     // so doing a realloc everytime we add a new entry shouldn't be too costly
      68               0 :     entries = static_cast<Entry*>(moz_xrealloc(entries, sizeof(Entry)*(count+1)));
      69                 : 
      70               0 :     entries[count].key      = key;
      71               0 :     entries[count].userData = userData;
      72               0 :     entries[count].destroy  = destroy;
      73                 : 
      74               0 :     count++;
      75               0 :   }
      76                 : 
      77                 :   /* Remove and return user data associated with key, without destroying it */
      78               0 :   void* Remove(UserDataKey *key)
      79                 :   {
      80               0 :     for (int i=0; i<count; i++) {
      81               0 :       if (key == entries[i].key) {
      82               0 :         void *userData = entries[i].userData;
      83                 :         // decrement before looping so entries[i+1] doesn't read past the end:
      84               0 :         --count;
      85               0 :         for (;i<count; i++) {
      86               0 :           entries[i] = entries[i+1];
      87                 :         }
      88               0 :         return userData;
      89                 :       }
      90                 :     }
      91               0 :     return NULL;
      92                 :   }
      93                 : 
      94                 :   /* Retrives the userData for the associated key */
      95               0 :   void *Get(UserDataKey *key)
      96                 :   {
      97               0 :     for (int i=0; i<count; i++) {
      98               0 :       if (key == entries[i].key) {
      99               0 :         return entries[i].userData;
     100                 :       }
     101                 :     }
     102               0 :     return NULL;
     103                 :   }
     104                 : 
     105               0 :   ~UserData()
     106                 :   {
     107               0 :     for (int i=0; i<count; i++) {
     108               0 :       entries[i].destroy(entries[i].userData);
     109                 :     }
     110               0 :     free(entries);
     111               0 :   }
     112                 : 
     113                 : private:
     114                 :   struct Entry {
     115                 :     const UserDataKey *key;
     116                 :     void *userData;
     117                 :     destroyFunc destroy;
     118                 :   };
     119                 : 
     120                 :   int count;
     121                 :   Entry *entries;
     122                 : 
     123                 : };
     124                 : 
     125                 : }
     126                 : }
     127                 : 
     128                 : #endif /* MOZILLA_GFX_USERDATA_H_ */

Generated by: LCOV version 1.7