/*

 **********************************************************************

 *   Copyright (C) 2003, 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) {

        LE_DELETE_ARRAY(fTableCache[i].table);

        fTableCache[i].tag   = 0;

        fTableCache[i].table = NULL;

    }

    fTableCacheCurr = 0;

    /* Nokia defect fix for memory leak - Jas: 23/06/2005 */

	LE_DELETE_ARRAY(fTableCache);

}

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);

    if (table) {

        ((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;

        FontTableCacheEntry *newTableCache =

            (FontTableCacheEntry *) LE_GROW_ARRAY(fTableCache, newSize);

        if (!newTableCache) {

            // could not grow the cache, so we won't cache the table.

            return;

        }

        fTableCache = newTableCache;

        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;

}