128 lines
4.8 KiB
C++
128 lines
4.8 KiB
C++
/* GRAPHITE2 LICENSING
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Copyright 2010, SIL International
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All rights reserved.
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This library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should also have received a copy of the GNU Lesser General Public
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License along with this library in the file named "LICENSE".
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If not, write to the Free Software Foundation, 51 Franklin Street,
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Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
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internet at http://www.fsf.org/licenses/lgpl.html.
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Alternatively, the contents of this file may be used under the terms of the
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Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
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License, as published by the Free Software Foundation, either version 2
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of the License or (at your option) any later version.
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*/
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#ifndef GRAPHITE2_NSEGCACHE
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#include <graphite2/Segment.h>
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#include "inc/CachedFace.h"
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#include "inc/SegCacheStore.h"
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using namespace graphite2;
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CachedFace::CachedFace(const void* appFaceHandle/*non-NULL*/, const gr_face_ops & ops)
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: Face(appFaceHandle, ops), m_cacheStore(0)
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{
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}
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CachedFace::~CachedFace()
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{
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delete m_cacheStore;
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}
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bool CachedFace::setupCache(unsigned int cacheSize)
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{
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m_cacheStore = new SegCacheStore(*this, m_numSilf, cacheSize);
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return bool(m_cacheStore);
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}
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bool CachedFace::runGraphite(Segment *seg, const Silf *pSilf) const
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{
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assert(pSilf);
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pSilf->runGraphite(seg, 0, pSilf->substitutionPass());
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unsigned int silfIndex = 0;
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for (; silfIndex < m_numSilf && &(m_silfs[silfIndex]) != pSilf; ++silfIndex);
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if (silfIndex == m_numSilf) return false;
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SegCache * const segCache = m_cacheStore->getOrCreate(silfIndex, seg->getFeatures(0));
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if (!segCache)
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return false;
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assert(m_cacheStore);
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// find where the segment can be broken
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Slot * subSegStartSlot = seg->first();
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Slot * subSegEndSlot = subSegStartSlot;
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uint16 cmapGlyphs[eMaxSpliceSize];
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int subSegStart = 0;
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for (unsigned int i = 0; i < seg->charInfoCount() && subSegEndSlot; ++i)
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{
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const unsigned int length = i - subSegStart + 1;
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if (length < eMaxSpliceSize && subSegEndSlot->gid() < m_cacheStore->maxCmapGid())
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cmapGlyphs[length-1] = subSegEndSlot->gid();
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else return false;
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const bool spaceOnly = m_cacheStore->isSpaceGlyph(subSegEndSlot->gid());
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// at this stage the character to slot mapping is still 1 to 1
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const int breakWeight = seg->charinfo(i)->breakWeight(),
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nextBreakWeight = (i + 1 < seg->charInfoCount())?
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seg->charinfo(i+1)->breakWeight() : 0;
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const uint8 f = seg->charinfo(i)->flags();
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if (((spaceOnly
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|| (breakWeight > 0 && breakWeight <= gr_breakWord)
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|| i + 1 == seg->charInfoCount()
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|| ((nextBreakWeight < 0 && nextBreakWeight >= gr_breakBeforeWord)
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|| (subSegEndSlot->next() && m_cacheStore->isSpaceGlyph(subSegEndSlot->next()->gid()))))
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&& f != 1)
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|| f == 2)
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{
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// record the next slot before any splicing
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Slot * nextSlot = subSegEndSlot->next();
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// spaces should be left untouched by graphite rules in any sane font
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if (!spaceOnly)
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{
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// found a break position, check for a cache of the sub sequence
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const SegCacheEntry * entry = segCache->find(cmapGlyphs, length);
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// TODO disable cache for words at start/end of line with contextuals
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if (!entry)
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{
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SegmentScopeState scopeState = seg->setScope(subSegStartSlot, subSegEndSlot, length);
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pSilf->runGraphite(seg, pSilf->substitutionPass(), pSilf->numPasses());
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if (length < eMaxSpliceSize)
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{
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seg->associateChars(subSegStart, length);
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segCache->cache(m_cacheStore, cmapGlyphs, length, seg, subSegStart);
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}
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seg->removeScope(scopeState);
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}
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else
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seg->splice(subSegStart, length, subSegStartSlot, subSegEndSlot,
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entry->first(), entry->glyphLength());
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}
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subSegStartSlot = subSegEndSlot = nextSlot;
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subSegStart = i + 1;
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}
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else
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{
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subSegEndSlot = subSegEndSlot->next();
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}
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}
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return true;
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}
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#endif
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