1/*
2 **********************************************************************
3 *   Copyright (C) 2003 - 2008, International Business Machines
4 *   Corporation and others.  All Rights Reserved.
5 **********************************************************************
6 */
7
8#include "layout/LETypes.h"
9
10#include "FontTableCache.h"
11
12#define TABLE_CACHE_INIT 5
13#define TABLE_CACHE_GROW 5
14
15struct FontTableCacheEntry
16{
17    LETag tag;
18    const void *table;
19};
20
21FontTableCache::FontTableCache()
22    : fTableCacheCurr(0), fTableCacheSize(TABLE_CACHE_INIT)
23{
24    fTableCache = LE_NEW_ARRAY(FontTableCacheEntry, fTableCacheSize);
25
26    if (fTableCache == NULL) {
27        fTableCacheSize = 0;
28        return;
29    }
30
31    for (int i = 0; i < fTableCacheSize; i += 1) {
32        fTableCache[i].tag   = 0;
33        fTableCache[i].table = NULL;
34    }
35}
36
37FontTableCache::~FontTableCache()
38{
39    for (int i = fTableCacheCurr - 1; i >= 0; i -= 1) {
40        freeFontTable(fTableCache[i].table);
41
42        fTableCache[i].tag   = 0;
43        fTableCache[i].table = NULL;
44    }
45
46    fTableCacheCurr = 0;
47
48    LE_DELETE_ARRAY(fTableCache);
49    fTableCache = NULL;
50}
51
52void FontTableCache::freeFontTable(const void *table) const
53{
54    LE_DELETE_ARRAY(table);
55}
56
57const void *FontTableCache::find(LETag tableTag) const
58{
59    for (int i = 0; i < fTableCacheCurr; i += 1) {
60        if (fTableCache[i].tag == tableTag) {
61            return fTableCache[i].table;
62        }
63    }
64
65    const void *table = readFontTable(tableTag);
66
67    ((FontTableCache *) this)->add(tableTag, table);
68
69    return table;
70}
71
72void FontTableCache::add(LETag tableTag, const void *table)
73{
74    if (fTableCacheCurr >= fTableCacheSize) {
75        le_int32 newSize = fTableCacheSize + TABLE_CACHE_GROW;
76
77        fTableCache = (FontTableCacheEntry *) LE_GROW_ARRAY(fTableCache, newSize);
78
79        for (le_int32 i = fTableCacheSize; i < newSize; i += 1) {
80            fTableCache[i].tag   = 0;
81            fTableCache[i].table = NULL;
82        }
83
84        fTableCacheSize = newSize;
85    }
86
87    fTableCache[fTableCacheCurr].tag   = tableTag;
88    fTableCache[fTableCacheCurr].table = table;
89
90    fTableCacheCurr += 1;
91}
92