icuSources/test/letest/FontTableCache.cpp

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   4  **********************************************************************
   5  *   Copyright (C) 2003-2013, International Business Machines
   6  *   Corporation and others.  All Rights Reserved.
   7  **********************************************************************
   8  */
   9
  10 #include "layout/LETypes.h"
  11
  12 //#include "letest.h"
  13 #include "FontTableCache.h"
  14
  15 #define TABLE_CACHE_INIT 5
  16 #define TABLE_CACHE_GROW 5
  17
  18 struct FontTableCacheEntry
  19 {
  20   LETag tag;
  21   const void *table;
  22   size_t length;
  23 };
  24
  25 FontTableCache::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         fTableCache[i].length = 0;
  39     }
  40 }
  41
  42 FontTableCache::~FontTableCache()
  43 {
  44     for (int i = fTableCacheCurr - 1; i >= 0; i -= 1) {
  45       LE_DELETE_ARRAY(fTableCache[i].table);
  46
  47         fTableCache[i].tag   = 0;
  48         fTableCache[i].table = NULL;
  49         fTableCache[i].length = 0;
  50     }
  51
  52     fTableCacheCurr = 0;
  53
  54     LE_DELETE_ARRAY(fTableCache);
  55 }
  56
  57 void FontTableCache::freeFontTable(const void *table) const
  58 {
  59   LE_DELETE_ARRAY(table);
  60 }
  61
  62 const void *FontTableCache::find(LETag tableTag, size_t &length) const
  63 {
  64     for (int i = 0; i < fTableCacheCurr; i += 1) {
  65         if (fTableCache[i].tag == tableTag) {
  66           length = fTableCache[i].length;
  67           return fTableCache[i].table;
  68         }
  69     }
  70
  71     const void *table = readFontTable(tableTag, length);
  72
  73     ((FontTableCache *) this)->add(tableTag, table, length);
  74
  75     return table;
  76 }
  77
  78 void FontTableCache::add(LETag tableTag, const void *table, size_t length)
  79 {
  80     if (fTableCacheCurr >= fTableCacheSize) {
  81         le_int32 newSize = fTableCacheSize + TABLE_CACHE_GROW;
  82
  83         fTableCache = (FontTableCacheEntry *) LE_GROW_ARRAY(fTableCache, newSize);
  84
  85         for (le_int32 i = fTableCacheSize; i < newSize; i += 1) {
  86             fTableCache[i].tag   = 0;
  87             fTableCache[i].table = NULL;
  88             fTableCache[i].length = 0;
  89         }
  90
  91         fTableCacheSize = newSize;
  92     }
  93
  94     fTableCache[fTableCacheCurr].tag   = tableTag;
  95     fTableCache[fTableCacheCurr].table = table;
  96     fTableCache[fTableCacheCurr].length = length;
  97
  98     fTableCacheCurr += 1;
  99 }