Viewing file:  FontTableCache.cpp (2.37 KB) -rw-r--r--
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/*
*************************************************************************
* © 2016 and later: Unicode, Inc. and others.
* License & terms of use: http://www.unicode.org/copyright.html#License
*************************************************************************
*************************************************************************
* Copyright (C) 2003 - 2008, International Business Machines
* Corporation and others. All Rights Reserved.
*************************************************************************
*/
#include "layout/LETypes.h"
#include "FontTableCache.h"
#define TABLE_CACHE_INIT 5
#define TABLE_CACHE_GROW 5
struct FontTableCacheEntry
{
LETag tag;
const void *table;
};
FontTableCache::FontTableCache()
: fTableCacheCurr(0), fTableCacheSize(TABLE_CACHE_INIT)
{
fTableCache = LE_NEW_ARRAY(FontTableCacheEntry, fTableCacheSize);
if (fTableCache == NULL) {
fTableCacheSize = 0;
return;
}
for (int i = 0; i < fTableCacheSize; i += 1) {
fTableCache[i].tag = 0;
fTableCache[i].table = NULL;
}
}
FontTableCache::~FontTableCache()
{
for (int i = fTableCacheCurr - 1; i >= 0; i -= 1) {
freeFontTable(fTableCache[i].table);
fTableCache[i].tag = 0;
fTableCache[i].table = NULL;
}
fTableCacheCurr = 0;
LE_DELETE_ARRAY(fTableCache);
fTableCache = NULL;
}
void FontTableCache::freeFontTable(const void *table) const
{
LE_DELETE_ARRAY(table);
}
const void *FontTableCache::find(LETag tableTag) const
{
for (int i = 0; i < fTableCacheCurr; i += 1) {
if (fTableCache[i].tag == tableTag) {
return fTableCache[i].table;
}
}
const void *table = readFontTable(tableTag);
((FontTableCache *) this)->add(tableTag, table);
return table;
}
void FontTableCache::add(LETag tableTag, const void *table)
{
if (fTableCacheCurr >= fTableCacheSize) {
le_int32 newSize = fTableCacheSize + TABLE_CACHE_GROW;
fTableCache = (FontTableCacheEntry *) LE_GROW_ARRAY(fTableCache, newSize);
for (le_int32 i = fTableCacheSize; i < newSize; i += 1) {
fTableCache[i].tag = 0;
fTableCache[i].table = NULL;
}
fTableCacheSize = newSize;
}
fTableCache[fTableCacheCurr].tag = tableTag;
fTableCache[fTableCacheCurr].table = table;
fTableCacheCurr += 1;
}
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