1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/graphite2/src/CachedFace.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,127 @@
1.4 +/* GRAPHITE2 LICENSING
1.5 +
1.6 + Copyright 2010, SIL International
1.7 + All rights reserved.
1.8 +
1.9 + This library is free software; you can redistribute it and/or modify
1.10 + it under the terms of the GNU Lesser General Public License as published
1.11 + by the Free Software Foundation; either version 2.1 of License, or
1.12 + (at your option) any later version.
1.13 +
1.14 + This program is distributed in the hope that it will be useful,
1.15 + but WITHOUT ANY WARRANTY; without even the implied warranty of
1.16 + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
1.17 + Lesser General Public License for more details.
1.18 +
1.19 + You should also have received a copy of the GNU Lesser General Public
1.20 + License along with this library in the file named "LICENSE".
1.21 + If not, write to the Free Software Foundation, 51 Franklin Street,
1.22 + Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
1.23 + internet at http://www.fsf.org/licenses/lgpl.html.
1.24 +
1.25 +Alternatively, the contents of this file may be used under the terms of the
1.26 +Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
1.27 +License, as published by the Free Software Foundation, either version 2
1.28 +of the License or (at your option) any later version.
1.29 +*/
1.30 +
1.31 +#ifndef GRAPHITE2_NSEGCACHE
1.32 +
1.33 +#include <graphite2/Segment.h>
1.34 +#include "inc/CachedFace.h"
1.35 +#include "inc/SegCacheStore.h"
1.36 +
1.37 +
1.38 +using namespace graphite2;
1.39 +
1.40 +CachedFace::CachedFace(const void* appFaceHandle/*non-NULL*/, const gr_face_ops & ops)
1.41 +: Face(appFaceHandle, ops), m_cacheStore(0)
1.42 +{
1.43 +}
1.44 +
1.45 +CachedFace::~CachedFace()
1.46 +{
1.47 + delete m_cacheStore;
1.48 +}
1.49 +
1.50 +bool CachedFace::setupCache(unsigned int cacheSize)
1.51 +{
1.52 + m_cacheStore = new SegCacheStore(*this, m_numSilf, cacheSize);
1.53 + return bool(m_cacheStore);
1.54 +}
1.55 +
1.56 +
1.57 +bool CachedFace::runGraphite(Segment *seg, const Silf *pSilf) const
1.58 +{
1.59 + assert(pSilf);
1.60 + pSilf->runGraphite(seg, 0, pSilf->substitutionPass());
1.61 +
1.62 + unsigned int silfIndex = 0;
1.63 + for (; silfIndex < m_numSilf && &(m_silfs[silfIndex]) != pSilf; ++silfIndex);
1.64 + if (silfIndex == m_numSilf) return false;
1.65 + SegCache * const segCache = m_cacheStore->getOrCreate(silfIndex, seg->getFeatures(0));
1.66 + if (!segCache)
1.67 + return false;
1.68 +
1.69 + assert(m_cacheStore);
1.70 + // find where the segment can be broken
1.71 + Slot * subSegStartSlot = seg->first();
1.72 + Slot * subSegEndSlot = subSegStartSlot;
1.73 + uint16 cmapGlyphs[eMaxSpliceSize];
1.74 + int subSegStart = 0;
1.75 + for (unsigned int i = 0; i < seg->charInfoCount(); ++i)
1.76 + {
1.77 + const unsigned int length = i - subSegStart + 1;
1.78 + if (length < eMaxSpliceSize)
1.79 + cmapGlyphs[length-1] = subSegEndSlot->gid();
1.80 + else return false;
1.81 + const bool spaceOnly = m_cacheStore->isSpaceGlyph(subSegEndSlot->gid());
1.82 + // at this stage the character to slot mapping is still 1 to 1
1.83 + const int breakWeight = seg->charinfo(i)->breakWeight(),
1.84 + nextBreakWeight = (i + 1 < seg->charInfoCount())?
1.85 + seg->charinfo(i+1)->breakWeight() : 0;
1.86 + const uint8 f = seg->charinfo(i)->flags();
1.87 + if (((spaceOnly
1.88 + || (breakWeight > 0 && breakWeight <= gr_breakWord)
1.89 + || i + 1 == seg->charInfoCount()
1.90 + || ((nextBreakWeight < 0 && nextBreakWeight >= gr_breakBeforeWord)
1.91 + || (subSegEndSlot->next() && m_cacheStore->isSpaceGlyph(subSegEndSlot->next()->gid()))))
1.92 + && f != 1)
1.93 + || f == 2)
1.94 + {
1.95 + // record the next slot before any splicing
1.96 + Slot * nextSlot = subSegEndSlot->next();
1.97 + // spaces should be left untouched by graphite rules in any sane font
1.98 + if (!spaceOnly)
1.99 + {
1.100 + // found a break position, check for a cache of the sub sequence
1.101 + const SegCacheEntry * entry = segCache->find(cmapGlyphs, length);
1.102 + // TODO disable cache for words at start/end of line with contextuals
1.103 + if (!entry)
1.104 + {
1.105 + SegmentScopeState scopeState = seg->setScope(subSegStartSlot, subSegEndSlot, length);
1.106 + pSilf->runGraphite(seg, pSilf->substitutionPass(), pSilf->numPasses());
1.107 + if (length < eMaxSpliceSize)
1.108 + {
1.109 + seg->associateChars(subSegStart, length);
1.110 + segCache->cache(m_cacheStore, cmapGlyphs, length, seg, subSegStart);
1.111 + }
1.112 + seg->removeScope(scopeState);
1.113 + }
1.114 + else
1.115 + seg->splice(subSegStart, length, subSegStartSlot, subSegEndSlot,
1.116 + entry->first(), entry->glyphLength());
1.117 + }
1.118 + subSegStartSlot = subSegEndSlot = nextSlot;
1.119 + subSegStart = i + 1;
1.120 + }
1.121 + else
1.122 + {
1.123 + subSegEndSlot = subSegEndSlot->next();
1.124 + }
1.125 + }
1.126 + return true;
1.127 +}
1.128 +
1.129 +#endif
1.130 +
