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Diffstat (limited to '')
| -rw-r--r-- | gfx/graphite2/src/FeatureMap.cpp | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/gfx/graphite2/src/FeatureMap.cpp b/gfx/graphite2/src/FeatureMap.cpp new file mode 100644 index 0000000000..014a88fd08 --- /dev/null +++ b/gfx/graphite2/src/FeatureMap.cpp @@ -0,0 +1,293 @@ +/* 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 <cstring> + +#include "inc/Main.h" +#include "inc/bits.h" +#include "inc/Endian.h" +#include "inc/FeatureMap.h" +#include "inc/FeatureVal.h" +#include "graphite2/Font.h" +#include "inc/TtfUtil.h" +#include <cstdlib> +#include "inc/Face.h" + + +using namespace graphite2; + +namespace +{ + static int cmpNameAndFeatures(const void *ap, const void *bp) + { + const NameAndFeatureRef & a = *static_cast<const NameAndFeatureRef *>(ap), + & b = *static_cast<const NameAndFeatureRef *>(bp); + return (a < b ? -1 : (b < a ? 1 : 0)); + } + + const size_t FEAT_HEADER = sizeof(uint32) + 2*sizeof(uint16) + sizeof(uint32), + FEATURE_SIZE = sizeof(uint32) + + 2*sizeof(uint16) + + sizeof(uint32) + + 2*sizeof(uint16), + FEATURE_SETTING_SIZE = sizeof(int16) + sizeof(uint16); + + uint16 readFeatureSettings(const byte * p, FeatureSetting * s, size_t num_settings) + { + uint16 max_val = 0; + for (FeatureSetting * const end = s + num_settings; s != end; ++s) + { + const int16 value = be::read<int16>(p); + ::new (s) FeatureSetting(value, be::read<uint16>(p)); + if (uint16(value) > max_val) max_val = value; + } + + return max_val; + } +} + +FeatureRef::FeatureRef(const Face & face, + unsigned short & bits_offset, uint32 max_val, + uint32 name, uint16 uiName, flags_t flags, + FeatureSetting *settings, uint16 num_set) throw() +: m_face(&face), + m_nameValues(settings), + m_mask(mask_over_val(max_val)), + m_max(max_val), + m_id(name), + m_nameid(uiName), + m_numSet(num_set), + m_flags(flags) +{ + const uint8 need_bits = bit_set_count(m_mask); + m_index = (bits_offset + need_bits) / SIZEOF_CHUNK; + if (m_index > bits_offset / SIZEOF_CHUNK) + bits_offset = m_index*SIZEOF_CHUNK; + m_bits = bits_offset % SIZEOF_CHUNK; + bits_offset += need_bits; + m_mask <<= m_bits; +} + +FeatureRef::~FeatureRef() throw() +{ + free(m_nameValues); +} + +bool FeatureMap::readFeats(const Face & face) +{ + const Face::Table feat(face, TtfUtil::Tag::Feat); + const byte * p = feat; + if (!p) return true; + if (feat.size() < FEAT_HEADER) return false; + + const byte *const feat_start = p, + *const feat_end = p + feat.size(); + + const uint32 version = be::read<uint32>(p); + m_numFeats = be::read<uint16>(p); + be::skip<uint16>(p); + be::skip<uint32>(p); + + // Sanity checks + if (m_numFeats == 0) return true; + if (version < 0x00010000 || + p + m_numFeats*FEATURE_SIZE > feat_end) + { //defensive + m_numFeats = 0; + return false; + } + + m_feats = new FeatureRef [m_numFeats]; + uint16 * const defVals = gralloc<uint16>(m_numFeats); + if (!defVals || !m_feats) return false; + unsigned short bits = 0; //to cause overflow on first Feature + + for (int i = 0, ie = m_numFeats; i != ie; i++) + { + const uint32 label = version < 0x00020000 ? be::read<uint16>(p) : be::read<uint32>(p); + const uint16 num_settings = be::read<uint16>(p); + if (version >= 0x00020000) + be::skip<uint16>(p); + const uint32 settings_offset = be::read<uint32>(p); + const uint16 flags = be::read<uint16>(p), + uiName = be::read<uint16>(p); + + if (settings_offset > size_t(feat_end - feat_start) + || settings_offset + num_settings * FEATURE_SETTING_SIZE > size_t(feat_end - feat_start)) + { + free(defVals); + return false; + } + + FeatureSetting *uiSet; + uint32 maxVal; + if (num_settings != 0) + { + uiSet = gralloc<FeatureSetting>(num_settings); + if (!uiSet) + { + free(defVals); + return false; + } + maxVal = readFeatureSettings(feat_start + settings_offset, uiSet, num_settings); + defVals[i] = uiSet[0].value(); + } + else + { + uiSet = 0; + maxVal = 0xffffffff; + defVals[i] = 0; + } + + ::new (m_feats + i) FeatureRef (face, bits, maxVal, + label, uiName, + FeatureRef::flags_t(flags), + uiSet, num_settings); + } + new (&m_defaultFeatures) Features(bits/(sizeof(uint32)*8) + 1, *this); + m_pNamedFeats = new NameAndFeatureRef[m_numFeats]; + if (!m_pNamedFeats) + { + free(defVals); + return false; + } + for (int i = 0; i < m_numFeats; ++i) + { + m_feats[i].applyValToFeature(defVals[i], m_defaultFeatures); + m_pNamedFeats[i] = m_feats[i]; + } + + free(defVals); + + qsort(m_pNamedFeats, m_numFeats, sizeof(NameAndFeatureRef), &cmpNameAndFeatures); + + return true; +} + +bool SillMap::readFace(const Face & face) +{ + if (!m_FeatureMap.readFeats(face)) return false; + if (!readSill(face)) return false; + return true; +} + + +bool SillMap::readSill(const Face & face) +{ + const Face::Table sill(face, TtfUtil::Tag::Sill); + const byte *p = sill; + + if (!p) return true; + if (sill.size() < 12) return false; + if (be::read<uint32>(p) != 0x00010000UL) return false; + m_numLanguages = be::read<uint16>(p); + m_langFeats = new LangFeaturePair[m_numLanguages]; + if (!m_langFeats || !m_FeatureMap.m_numFeats) { m_numLanguages = 0; return true; } //defensive + + p += 6; // skip the fast search + if (sill.size() < m_numLanguages * 8U + 12) return false; + + for (int i = 0; i < m_numLanguages; i++) + { + uint32 langid = be::read<uint32>(p); + uint16 numSettings = be::read<uint16>(p); + uint16 offset = be::read<uint16>(p); + if (offset + 8U * numSettings > sill.size() && numSettings > 0) return false; + Features* feats = new Features(m_FeatureMap.m_defaultFeatures); + if (!feats) return false; + const byte *pLSet = sill + offset; + + // Apply langauge specific settings + for (int j = 0; j < numSettings; j++) + { + uint32 name = be::read<uint32>(pLSet); + uint16 val = be::read<uint16>(pLSet); + pLSet += 2; + const FeatureRef* pRef = m_FeatureMap.findFeatureRef(name); + if (pRef) pRef->applyValToFeature(val, *feats); + } + // Add the language id feature which is always feature id 1 + const FeatureRef* pRef = m_FeatureMap.findFeatureRef(1); + if (pRef) pRef->applyValToFeature(langid, *feats); + + m_langFeats[i].m_lang = langid; + m_langFeats[i].m_pFeatures = feats; + } + return true; +} + + +Features* SillMap::cloneFeatures(uint32 langname/*0 means default*/) const +{ + if (langname) + { + // the number of languages in a font is usually small e.g. 8 in Doulos + // so this loop is not very expensive + for (uint16 i = 0; i < m_numLanguages; i++) + { + if (m_langFeats[i].m_lang == langname) + return new Features(*m_langFeats[i].m_pFeatures); + } + } + return new Features (m_FeatureMap.m_defaultFeatures); +} + + + +const FeatureRef *FeatureMap::findFeatureRef(uint32 name) const +{ + NameAndFeatureRef *it; + + for (it = m_pNamedFeats; it < m_pNamedFeats + m_numFeats; ++it) + if (it->m_name == name) + return it->m_pFRef; + return NULL; +} + +bool FeatureRef::applyValToFeature(uint32 val, Features & pDest) const +{ + if (val>maxVal() || !m_face) + return false; + if (pDest.m_pMap==NULL) + pDest.m_pMap = &m_face->theSill().theFeatureMap(); + else + if (pDest.m_pMap!=&m_face->theSill().theFeatureMap()) + return false; //incompatible + if (m_index >= pDest.size()) + pDest.resize(m_index+1); + pDest[m_index] &= ~m_mask; + pDest[m_index] |= (uint32(val) << m_bits); + return true; +} + +uint32 FeatureRef::getFeatureVal(const Features& feats) const +{ + if (m_index < feats.size() && m_face + && &m_face->theSill().theFeatureMap()==feats.m_pMap) + return (feats[m_index] & m_mask) >> m_bits; + else + return 0; +} |