KHtml

tile.h
1 /*
2  Large image displaying library.
3 
4  Copyright (C) 2004,2005 Maks Orlovich ([email protected])
5 
6  Permission is hereby granted, free of charge, to any person obtaining a copy
7  of this software and associated documentation files (the "Software"), to deal
8  in the Software without restriction, including without limitation the rights
9  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10  copies of the Software, and to permit persons to whom the Software is
11  furnished to do so, subject to the following conditions:
12 
13  The above copyright notice and this permission notice shall be included in
14  all copies or substantial portions of the Software.
15 
16  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19  AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
20  AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 
23 */
24 
25 #ifndef TILE_H
26 #define TILE_H
27 
28 #include <cstring>
29 
30 
31 namespace khtmlImLoad
32 {
33 
34 class TileCache;
35 class TileCacheNode;
36 
37 /**
38  We hold pointers tiles in the cache. The interface is simple: when they get
39  kicked out of the cache, the discard method is invoked to have the associated
40  resources freed. Note that the cache does not own the entries, but merely
41  mages the more expensive part of their resources. The cacheEntry
42  field is used to link the tile node to the appropriate cache entry for it.
43 */
44 class Tile
45 {
46 public:
47  enum {TileSize = 64};
48  //Note:this can be safely reduced, but not increased --- ScaledPlane
49  //relies for byte offsets in a single row in a tile fitting into bytes
50 
51  unsigned char versions[Tile::TileSize];
52 protected:
53  friend class TileCache;
54 
55  Tile(): cacheNode(nullptr)
56  {
57  std::memset(versions, 0, Tile::TileSize);
58  }
59  virtual ~Tile() {}
60  virtual void discard() = 0;
61 
62  TileCacheNode *cacheNode;
63 };
64 
65 }
66 
67 #endif
An LRU-replacement cache for tiles.
Definition: tilecache.h:68
We hold pointers tiles in the cache.
Definition: tile.h:44
This file is part of the KDE documentation.
Documentation copyright © 1996-2021 The KDE developers.
Generated on Sat Oct 16 2021 22:48:02 by doxygen 1.8.11 written by Dimitri van Heesch, © 1997-2006

KDE's Doxygen guidelines are available online.