1/*
2 **********************************************************************
3 *   Copyright (C) 2003-2013, International Business Machines
4 *   Corporation and others.  All Rights Reserved.
5 **********************************************************************
6 */
7
8#include "layout/LETypes.h"
9
10//#include "letest.h"
11#include "FontTableCache.h"
12
13#define TABLE_CACHE_INIT 5
14#define TABLE_CACHE_GROW 5
15
16struct FontTableCacheEntry
17{
18  LETag tag;
19  const void *table;
20  size_t length;
21};
22
23FontTableCache::FontTableCache()
24    : fTableCacheCurr(0), fTableCacheSize(TABLE_CACHE_INIT)
25{
26    fTableCache = LE_NEW_ARRAY(FontTableCacheEntry, fTableCacheSize);
27
28    if (fTableCache == NULL) {
29        fTableCacheSize = 0;
30        return;
31    }
32
33    for (int i = 0; i < fTableCacheSize; i += 1) {
34        fTableCache[i].tag   = 0;
35        fTableCache[i].table = NULL;
36        fTableCache[i].length = 0;
37    }
38}
39
40FontTableCache::~FontTableCache()
41{
42    for (int i = fTableCacheCurr - 1; i >= 0; i -= 1) {
43      LE_DELETE_ARRAY(fTableCache[i].table);
44
45        fTableCache[i].tag   = 0;
46        fTableCache[i].table = NULL;
47        fTableCache[i].length = 0;
48    }
49
50    fTableCacheCurr = 0;
51
52    LE_DELETE_ARRAY(fTableCache);
53}
54
55void FontTableCache::freeFontTable(const void *table) const
56{
57  LE_DELETE_ARRAY(table);
58}
59
60const void *FontTableCache::find(LETag tableTag, size_t &length) const
61{
62    for (int i = 0; i < fTableCacheCurr; i += 1) {
63        if (fTableCache[i].tag == tableTag) {
64          length = fTableCache[i].length;
65          return fTableCache[i].table;
66        }
67    }
68
69    const void *table = readFontTable(tableTag, length);
70
71    ((FontTableCache *) this)->add(tableTag, table, length);
72
73    return table;
74}
75
76void FontTableCache::add(LETag tableTag, const void *table, size_t length)
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            fTableCache[i].length = 0;
87        }
88
89        fTableCacheSize = newSize;
90    }
91
92    fTableCache[fTableCacheCurr].tag   = tableTag;
93    fTableCache[fTableCacheCurr].table = table;
94    fTableCache[fTableCacheCurr].length = length;
95
96    fTableCacheCurr += 1;
97}
98