1/*
2 *************************************************************************
3 *   © 2016 and later: Unicode, Inc. and others.
4 *   License & terms of use: http://www.unicode.org/copyright.html
5 *************************************************************************
6 *************************************************************************
7 *   Copyright (C) 2003 - 2008, International Business Machines
8 *   Corporation and others.  All Rights Reserved.
9 *************************************************************************
10 */
11
12#include "layout/LETypes.h"
13
14#include "FontTableCache.h"
15
16#define TABLE_CACHE_INIT 5
17#define TABLE_CACHE_GROW 5
18
19struct FontTableCacheEntry
20{
21    LETag tag;
22    const void *table;
23};
24
25FontTableCache::FontTableCache()
26    : fTableCacheCurr(0), fTableCacheSize(TABLE_CACHE_INIT)
27{
28    fTableCache = LE_NEW_ARRAY(FontTableCacheEntry, fTableCacheSize);
29
30    if (fTableCache == NULL) {
31        fTableCacheSize = 0;
32        return;
33    }
34
35    for (int i = 0; i < fTableCacheSize; i += 1) {
36        fTableCache[i].tag   = 0;
37        fTableCache[i].table = NULL;
38    }
39}
40
41FontTableCache::~FontTableCache()
42{
43    for (int i = fTableCacheCurr - 1; i >= 0; i -= 1) {
44        freeFontTable(fTableCache[i].table);
45
46        fTableCache[i].tag   = 0;
47        fTableCache[i].table = NULL;
48    }
49
50    fTableCacheCurr = 0;
51
52    LE_DELETE_ARRAY(fTableCache);
53    fTableCache = NULL;
54}
55
56void FontTableCache::freeFontTable(const void *table) const
57{
58    LE_DELETE_ARRAY(table);
59}
60
61const void *FontTableCache::find(LETag tableTag) const
62{
63    for (int i = 0; i < fTableCacheCurr; i += 1) {
64        if (fTableCache[i].tag == tableTag) {
65            return fTableCache[i].table;
66        }
67    }
68
69    const void *table = readFontTable(tableTag);
70
71    ((FontTableCache *) this)->add(tableTag, table);
72
73    return table;
74}
75
76void FontTableCache::add(LETag tableTag, const void *table)
77{
78    if (fTableCacheCurr >= fTableCacheSize) {
79        le_int32 newSize = fTableCacheSize + TABLE_CACHE_GROW;
80
81        fTableCache = (FontTableCacheEntry *) LE_GROW_ARRAY(fTableCache, newSize);
82
83        for (le_int32 i = fTableCacheSize; i < newSize; i += 1) {
84            fTableCache[i].tag   = 0;
85            fTableCache[i].table = NULL;
86        }
87
88        fTableCacheSize = newSize;
89    }
90
91    fTableCache[fTableCacheCurr].tag   = tableTag;
92    fTableCache[fTableCacheCurr].table = table;
93
94    fTableCacheCurr += 1;
95}
96