diff options
Diffstat (limited to 'gfx/graphite2/src/SegCache.cpp')
| -rw-r--r-- | gfx/graphite2/src/SegCache.cpp | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/gfx/graphite2/src/SegCache.cpp b/gfx/graphite2/src/SegCache.cpp new file mode 100644 index 000000000..b577efa27 --- /dev/null +++ b/gfx/graphite2/src/SegCache.cpp @@ -0,0 +1,224 @@ +/* GRAPHITE2 LICENSING + + Copyright 2010, SIL International + All rights reserved. + + This library is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as published + by the Free Software Foundation; either version 2.1 of License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should also have received a copy of the GNU Lesser General Public + License along with this library in the file named "LICENSE". + If not, write to the Free Software Foundation, 51 Franklin Street, + Suite 500, Boston, MA 02110-1335, USA or visit their web page on the + internet at http://www.fsf.org/licenses/lgpl.html. + +Alternatively, the contents of this file may be used under the terms of the +Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public +License, as published by the Free Software Foundation, either version 2 +of the License or (at your option) any later version. +*/ + +#include "inc/Main.h" +#include "inc/TtfTypes.h" +#include "inc/TtfUtil.h" +#include "inc/SegCache.h" +#include "inc/SegCacheEntry.h" +#include "inc/SegCacheStore.h" +#include "inc/CmapCache.h" + + +using namespace graphite2; + +#ifndef GRAPHITE2_NSEGCACHE + +SegCache::SegCache(const SegCacheStore * store, const Features & feats) +: m_prefixLength(ePrefixLength), +// m_maxCachedSegLength(eMaxSpliceSize), + m_segmentCount(0), + m_features(feats), + m_totalAccessCount(0l), m_totalMisses(0l), + m_purgeFactor(1.0f / (ePurgeFactor * store->maxSegmentCount())) +{ + m_prefixes.raw = grzeroalloc<void*>(store->maxCmapGid() + 2); + m_prefixes.range[SEG_CACHE_MIN_INDEX] = SEG_CACHE_UNSET_INDEX; + m_prefixes.range[SEG_CACHE_MAX_INDEX] = SEG_CACHE_UNSET_INDEX; +} + +void SegCache::freeLevel(SegCacheStore * store, SegCachePrefixArray prefixes, size_t level) +{ + for (size_t i = 0; i < store->maxCmapGid(); i++) + { + if (prefixes.array[i].raw) + { + if (level + 1 < ePrefixLength) + freeLevel(store, prefixes.array[i], level + 1); + else + { + SegCachePrefixEntry * prefixEntry = prefixes.prefixEntries[i]; + delete prefixEntry; + } + } + } + free(prefixes.raw); +} + +void SegCache::clear(SegCacheStore * store) +{ + freeLevel(store, m_prefixes, 0); + m_prefixes.raw = NULL; +} + +SegCache::~SegCache() +{ + assert(m_prefixes.raw == NULL); +} + +SegCacheEntry* SegCache::cache(SegCacheStore * store, const uint16* cmapGlyphs, size_t length, Segment * seg, size_t charOffset) +{ + uint16 pos = 0; + if (!length) return NULL; +// assert(length < m_maxCachedSegLength); + SegCachePrefixArray pArray = m_prefixes; + while (pos + 1 < m_prefixLength) + { + uint16 gid = (pos < length)? cmapGlyphs[pos] : 0; + if (!pArray.array[gid].raw) + { + pArray.array[gid].raw = grzeroalloc<void*>(store->maxCmapGid() + 2); + if (!pArray.array[gid].raw) + return NULL; // malloc failed + if (pArray.range[SEG_CACHE_MIN_INDEX] == SEG_CACHE_UNSET_INDEX) + { + pArray.range[SEG_CACHE_MIN_INDEX] = gid; + pArray.range[SEG_CACHE_MAX_INDEX] = gid; + } + else + { + if (gid < pArray.range[SEG_CACHE_MIN_INDEX]) + pArray.range[SEG_CACHE_MIN_INDEX] = gid; + else if (gid > pArray.range[SEG_CACHE_MAX_INDEX]) + pArray.range[SEG_CACHE_MAX_INDEX] = gid; + } + } + pArray = pArray.array[gid]; + ++pos; + } + uint16 gid = (pos < length)? cmapGlyphs[pos] : 0; + SegCachePrefixEntry * prefixEntry = pArray.prefixEntries[gid]; + if (!prefixEntry) + { + prefixEntry = new SegCachePrefixEntry(); + pArray.prefixEntries[gid] = prefixEntry; + if (pArray.range[SEG_CACHE_MIN_INDEX] == SEG_CACHE_UNSET_INDEX) + { + pArray.range[SEG_CACHE_MIN_INDEX] = gid; + pArray.range[SEG_CACHE_MAX_INDEX] = gid; + } + else + { + if (gid < pArray.range[SEG_CACHE_MIN_INDEX]) + pArray.range[SEG_CACHE_MIN_INDEX] = gid; + else if (gid > pArray.range[SEG_CACHE_MAX_INDEX]) + pArray.range[SEG_CACHE_MAX_INDEX] = gid; + } + } + if (!prefixEntry) return NULL; + // if the cache is full run a purge - this is slow, since it walks the tree + if (m_segmentCount + 1 > store->maxSegmentCount()) + { + purge(store); + assert(m_segmentCount < store->maxSegmentCount()); + } + SegCacheEntry * pEntry = prefixEntry->cache(cmapGlyphs, length, seg, charOffset, m_totalAccessCount); + if (pEntry) ++m_segmentCount; + return pEntry; +} + +void SegCache::purge(SegCacheStore * store) +{ + unsigned long long minAccessCount = static_cast<unsigned long long>(m_totalAccessCount * m_purgeFactor + 1); + if (minAccessCount < 2) minAccessCount = 2; + unsigned long long oldAccessTime = m_totalAccessCount - store->maxSegmentCount() / eAgeFactor; + purgeLevel(store, m_prefixes, 0, minAccessCount, oldAccessTime); +} + +void SegCache::purgeLevel(SegCacheStore * store, SegCachePrefixArray prefixes, size_t level, + unsigned long long minAccessCount, unsigned long long oldAccessTime) +{ + if (prefixes.range[SEG_CACHE_MIN_INDEX] == SEG_CACHE_UNSET_INDEX) return; + size_t maxGlyphCached = prefixes.range[SEG_CACHE_MAX_INDEX]; + for (size_t i = prefixes.range[SEG_CACHE_MIN_INDEX]; i <= maxGlyphCached; i++) + { + if (prefixes.array[i].raw) + { + if (level + 1 < ePrefixLength) + purgeLevel(store, prefixes.array[i], level + 1, minAccessCount, oldAccessTime); + else + { + SegCachePrefixEntry * prefixEntry = prefixes.prefixEntries[i]; + m_segmentCount -= prefixEntry->purge(minAccessCount, + oldAccessTime, m_totalAccessCount); + } + } + } +} + +uint32 SegCachePrefixEntry::purge(unsigned long long minAccessCount, + unsigned long long oldAccessTime, + unsigned long long currentTime) +{ + // ignore the purge request if another has been done recently + //if (m_lastPurge > oldAccessTime) + // return 0; + + uint32 totalPurged = 0; + // real length is length + 1 in this loop + for (uint16 length = 0; length < eMaxSpliceSize; length++) + { + if (m_entryCounts[length] == 0) + continue; + uint16 purgeCount = 0; + uint16 newIndex = 0; + for (uint16 j = 0; j < m_entryCounts[length]; j++) + { + SegCacheEntry & tempEntry = m_entries[length][j]; + // purge entries with a low access count which haven't been + // accessed recently + if (tempEntry.accessCount() <= minAccessCount && + tempEntry.lastAccess() <= oldAccessTime) + { + tempEntry.clear(); + ++purgeCount; + } + else + { + memcpy(m_entries[length] + newIndex++, m_entries[length] + j, sizeof(SegCacheEntry)); + } + } + if (purgeCount == m_entryCounts[length]) + { + assert(newIndex == 0); + m_entryCounts[length] = 0; + m_entryBSIndex[length] = 0; + free(m_entries[length]); + m_entries[length] = NULL; + } + else if (purgeCount > 0) + { + assert(m_entryCounts[length] == newIndex + purgeCount); + m_entryCounts[length] = newIndex; + } + totalPurged += purgeCount; + } + m_lastPurge = currentTime; + return totalPurged; +} + +#endif |