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1 /*
2 **********************************************************************
3 * Copyright (C) 2003, 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
15 struct FontTableCacheEntry
16 {
17 LETag tag;
18 const void *table;
19 };
20
21 FontTableCache::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
37 FontTableCache::~FontTableCache()
38 {
39 for (int i = fTableCacheCurr - 1; i >= 0; i -= 1) {
40 LE_DELETE_ARRAY(fTableCache[i].table);
41
42 fTableCache[i].tag = 0;
43 fTableCache[i].table = NULL;
44 }
45
46 fTableCacheCurr = 0;
47 }
48
49 const void *FontTableCache::find(LETag tableTag) const
50 {
51 for (int i = 0; i < fTableCacheCurr; i += 1) {
52 if (fTableCache[i].tag == tableTag) {
53 return fTableCache[i].table;
54 }
55 }
56
57 const void *table = readFontTable(tableTag);
58
59 ((FontTableCache *) this)->add(tableTag, table);
60
61 return table;
62 }
63
64 void FontTableCache::add(LETag tableTag, const void *table)
65 {
66 if (fTableCacheCurr >= fTableCacheSize) {
67 le_int32 newSize = fTableCacheSize + TABLE_CACHE_GROW;
68
69 fTableCache = (FontTableCacheEntry *) LE_GROW_ARRAY(fTableCache, newSize);
70
71 for (le_int32 i = fTableCacheSize; i < newSize; i += 1) {
72 fTableCache[i].tag = 0;
73 fTableCache[i].table = NULL;
74 }
75
76 fTableCacheSize = newSize;
77 }
78
79 fTableCache[fTableCacheCurr].tag = tableTag;
80 fTableCache[fTableCacheCurr].table = table;
81
82 fTableCacheCurr += 1;
83 }