/*

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

  *   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;

 }