tile-manager.h 3.8 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
Elliot Lee's avatar
Elliot Lee committed
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
#ifndef __TILE_MANAGER_H__
#define __TILE_MANAGER_H__


#include "tile.h"


typedef struct _TileLevel    TileLevel;
typedef struct _TileManager  TileManager;

typedef void (*TileValidateProc) (TileManager *tm,
				  Tile        *tile,
				  int          level);


/* Creates a new tile manager with the specified
 *  width for the toplevel. The toplevel sizes is
 *  used to compute the number of levels and there
 *  size. Each level is 1/2 the width and height of
 *  the level above it.
 * The toplevel is level 0. The smallest level in the
 *  hierarchy is "nlevels - 1". That level will be smaller
 *  than TILE_WIDTH x TILE_HEIGHT
 */
TileManager* tile_manager_new (int toplevel_width,
			       int toplevel_height,
			       int bpp);

/* Destroy a tile manager and all the tiles it contains.
 */
void tile_manager_destroy (TileManager *tm);

/* Calculate the number of levels necessary to have a complete
 *  hierarchy. This procedure is normally called twice with
 *  the width and then height and the maximum value returned
 *  is then used as the number of levels an image needs.
 */
int tile_manager_calc_levels (int size,
			      int tile_size);

/* Set the number of levels this tile manager is managing.
 *  This procedure may destroy unnecessary levels in the
 *  tile manager if the new number of levels is less than
 *  the old number of levels.
 * Any newly added levels will consist of invalid tiles.
 */
void tile_manager_set_nlevels (TileManager *tm,
			       int          nlevels);

/* Set the validate procedure for the tile manager.
 *  The validate procedure is called when an invalid tile
 *  is referenced. If the procedure is NULL, then the tile
 *  is set to valid and its memory is allocated, but
 *  not initialized.
 */
void tile_manager_set_validate_proc (TileManager      *tm,
				     TileValidateProc  proc);

/* Get a specified tile from a tile manager. The tile
 *  is from the given level and contains the specified
 *  pixel. Be aware that the pixel coordinates are
 *  dependent on the level.
 */
Tile* tile_manager_get_tile (TileManager *tm,
			     int          xpixel,
			     int          ypixel,
			     int          level);

/* Get a specified tile from a tile manager.
 */
Tile* tile_manager_get (TileManager *tm,
			int          tile_num,
			int          level);

/* Validate a tiles memory.
 */
void tile_manager_validate (TileManager *tm,
			    Tile        *tile);

/* Given a toplevel tile, this procedure will invalidate
 *  (set the dirty bit) for all tiles in lower levels which
 *  contain this toplevel tile.
 * Note: if a level hasn't been created then the tile for that
 *       level won't be invalidated.
 */
void tile_manager_invalidate_tiles (TileManager *tm,
				    Tile        *toplevel_tile);

/* Invalidates all the tiles in the sublevels.
 */
void tile_manager_invalidate_sublevels (TileManager *tm);

/* Update a portion lower level tile given a toplevel tile.
 */
void tile_manager_update_tile (TileManager *tm,
			       Tile        *toplevel_tile,
			       int          level);


#endif /* __TILE_MANAGER_H__ */