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Diffstat (limited to 'gfx/graphite2/src/Face.cpp')
| -rw-r--r-- | gfx/graphite2/src/Face.cpp | 370 |
1 files changed, 370 insertions, 0 deletions
diff --git a/gfx/graphite2/src/Face.cpp b/gfx/graphite2/src/Face.cpp new file mode 100644 index 000000000..81b5ced8c --- /dev/null +++ b/gfx/graphite2/src/Face.cpp @@ -0,0 +1,370 @@ +/* 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 "graphite2/Segment.h" +#include "inc/CmapCache.h" +#include "inc/debug.h" +#include "inc/Decompressor.h" +#include "inc/Endian.h" +#include "inc/Face.h" +#include "inc/FileFace.h" +#include "inc/GlyphFace.h" +#include "inc/json.h" +#include "inc/SegCacheStore.h" +#include "inc/Segment.h" +#include "inc/NameTable.h" +#include "inc/Error.h" + +using namespace graphite2; + +namespace +{ +enum compression +{ + NONE, + LZ4 +}; + +} + +Face::Face(const void* appFaceHandle/*non-NULL*/, const gr_face_ops & ops) +: m_appFaceHandle(appFaceHandle), + m_pFileFace(NULL), + m_pGlyphFaceCache(NULL), + m_cmap(NULL), + m_pNames(NULL), + m_logger(NULL), + m_error(0), m_errcntxt(0), + m_silfs(NULL), + m_numSilf(0), + m_ascent(0), + m_descent(0) +{ + memset(&m_ops, 0, sizeof m_ops); + memcpy(&m_ops, &ops, min(sizeof m_ops, ops.size)); +} + + +Face::~Face() +{ + setLogger(0); + delete m_pGlyphFaceCache; + delete m_cmap; + delete[] m_silfs; +#ifndef GRAPHITE2_NFILEFACE + delete m_pFileFace; +#endif + delete m_pNames; +} + +float Face::default_glyph_advance(const void* font_ptr, gr_uint16 glyphid) +{ + const Font & font = *reinterpret_cast<const Font *>(font_ptr); + + return font.face().glyphs().glyph(glyphid)->theAdvance().x * font.scale(); +} + +bool Face::readGlyphs(uint32 faceOptions) +{ + Error e; +#ifdef GRAPHITE2_TELEMETRY + telemetry::category _glyph_cat(tele.glyph); +#endif + error_context(EC_READGLYPHS); + m_pGlyphFaceCache = new GlyphCache(*this, faceOptions); + + if (e.test(!m_pGlyphFaceCache, E_OUTOFMEM) + || e.test(m_pGlyphFaceCache->numGlyphs() == 0, E_NOGLYPHS) + || e.test(m_pGlyphFaceCache->unitsPerEm() == 0, E_BADUPEM)) + { + return error(e); + } + + if (faceOptions & gr_face_cacheCmap) + m_cmap = new CachedCmap(*this); + else + m_cmap = new DirectCmap(*this); + if (e.test(!m_cmap, E_OUTOFMEM) || e.test(!*m_cmap, E_BADCMAP)) + return error(e); + + if (faceOptions & gr_face_preloadGlyphs) + nameTable(); // preload the name table along with the glyphs. + + return true; +} + +bool Face::readGraphite(const Table & silf) +{ +#ifdef GRAPHITE2_TELEMETRY + telemetry::category _silf_cat(tele.silf); +#endif + Error e; + error_context(EC_READSILF); + const byte * p = silf; + if (e.test(!p, E_NOSILF) || e.test(silf.size() < 20, E_BADSIZE)) return error(e); + + const uint32 version = be::read<uint32>(p); + if (e.test(version < 0x00020000, E_TOOOLD)) return error(e); + if (version >= 0x00030000) + be::skip<uint32>(p); // compilerVersion + m_numSilf = be::read<uint16>(p); + + be::skip<uint16>(p); // reserved + + bool havePasses = false; + m_silfs = new Silf[m_numSilf]; + if (e.test(!m_silfs, E_OUTOFMEM)) return error(e); + for (int i = 0; i < m_numSilf; i++) + { + error_context(EC_ASILF + (i << 8)); + const uint32 offset = be::read<uint32>(p), + next = i == m_numSilf - 1 ? silf.size() : be::peek<uint32>(p); + if (e.test(next > silf.size() || offset >= next, E_BADSIZE)) + return error(e); + + if (!m_silfs[i].readGraphite(silf + offset, next - offset, *this, version)) + return false; + + if (m_silfs[i].numPasses()) + havePasses = true; + } + + return havePasses; +} + +bool Face::readFeatures() +{ + return m_Sill.readFace(*this); +} + +bool Face::runGraphite(Segment *seg, const Silf *aSilf) const +{ +#if !defined GRAPHITE2_NTRACING + json * dbgout = logger(); + if (dbgout) + { + *dbgout << json::object + << "id" << objectid(seg) + << "passes" << json::array; + } +#endif + +// if ((seg->dir() & 1) != aSilf->dir()) +// seg->reverseSlots(); + if ((seg->dir() & 3) == 3 && aSilf->bidiPass() == 0xFF) + seg->doMirror(aSilf->aMirror()); + bool res = aSilf->runGraphite(seg, 0, aSilf->positionPass(), true); + if (res) + { + seg->associateChars(0, seg->charInfoCount()); + if (aSilf->flags() & 0x20) + res &= seg->initCollisions(); + if (res) + res &= aSilf->runGraphite(seg, aSilf->positionPass(), aSilf->numPasses(), false); + } + +#if !defined GRAPHITE2_NTRACING + if (dbgout) +{ + seg->positionSlots(0, 0, 0, seg->currdir()); + *dbgout << json::item + << json::close // Close up the passes array + << "outputdir" << (seg->currdir() ? "rtl" : "ltr") + << "output" << json::array; + for(Slot * s = seg->first(); s; s = s->next()) + *dbgout << dslot(seg, s); + *dbgout << json::close + << "advance" << seg->advance() + << "chars" << json::array; + for(size_t i = 0, n = seg->charInfoCount(); i != n; ++i) + *dbgout << json::flat << *seg->charinfo(i); + *dbgout << json::close // Close up the chars array + << json::close; // Close up the segment object + } +#endif + + return res; +} + +void Face::setLogger(FILE * log_file GR_MAYBE_UNUSED) +{ +#if !defined GRAPHITE2_NTRACING + delete m_logger; + m_logger = log_file ? new json(log_file) : 0; +#endif +} + +const Silf *Face::chooseSilf(uint32 script) const +{ + if (m_numSilf == 0) + return NULL; + else if (m_numSilf == 1 || script == 0) + return m_silfs; + else // do more work here + return m_silfs; +} + +uint16 Face::findPseudo(uint32 uid) const +{ + return (m_numSilf) ? m_silfs[0].findPseudo(uid) : 0; +} + +int32 Face::getGlyphMetric(uint16 gid, uint8 metric) const +{ + switch (metrics(metric)) + { + case kgmetAscent : return m_ascent; + case kgmetDescent : return m_descent; + default: + if (gid >= glyphs().numGlyphs()) return 0; + return glyphs().glyph(gid)->getMetric(metric); + } +} + +void Face::takeFileFace(FileFace* pFileFace GR_MAYBE_UNUSED/*takes ownership*/) +{ +#ifndef GRAPHITE2_NFILEFACE + if (m_pFileFace==pFileFace) + return; + + delete m_pFileFace; + m_pFileFace = pFileFace; +#endif +} + +NameTable * Face::nameTable() const +{ + if (m_pNames) return m_pNames; + const Table name(*this, Tag::name); + if (name) + m_pNames = new NameTable(name, name.size()); + return m_pNames; +} + +uint16 Face::languageForLocale(const char * locale) const +{ + nameTable(); + if (m_pNames) + return m_pNames->getLanguageId(locale); + return 0; +} + + + +Face::Table::Table(const Face & face, const Tag n, uint32 version) throw() +: _f(&face), _compressed(false) +{ + size_t sz = 0; + _p = static_cast<const byte *>((*_f->m_ops.get_table)(_f->m_appFaceHandle, n, &sz)); + _sz = uint32(sz); + + if (!TtfUtil::CheckTable(n, _p, _sz)) + { + releaseBuffers(); // Make sure we release the table buffer even if the table failed it's checks + return; + } + + if (be::peek<uint32>(_p) >= version) + decompress(); +} + +void Face::Table::releaseBuffers() +{ + if (_compressed) + free(const_cast<byte *>(_p)); + else if (_p && _f->m_ops.release_table) + (*_f->m_ops.release_table)(_f->m_appFaceHandle, _p); + _p = 0; _sz = 0; +} + +Face::Table & Face::Table::operator = (const Table & rhs) throw() +{ + if (_p == rhs._p) return *this; + + this->~Table(); + new (this) Table(rhs); + return *this; +} + +Error Face::Table::decompress() +{ + Error e; + if (e.test(_sz < 5 * sizeof(uint32), E_BADSIZE)) + return e; + byte * uncompressed_table = 0; + size_t uncompressed_size = 0; + + const byte * p = _p; + const uint32 version = be::read<uint32>(p); // Table version number. + + // The scheme is in the top 5 bits of the 1st uint32. + const uint32 hdr = be::read<uint32>(p); + switch(compression(hdr >> 27)) + { + case NONE: return e; + + case LZ4: + { + uncompressed_size = hdr & 0x07ffffff; + uncompressed_table = gralloc<byte>(uncompressed_size); + if (!e.test(!uncompressed_table || uncompressed_size < 4, E_OUTOFMEM)) + { + memset(uncompressed_table, 0, 4); // make sure version number is initialised + // coverity[forward_null : FALSE] - uncompressed_table has been checked so can't be null + // coverity[checked_return : FALSE] - we test e later + e.test(lz4::decompress(p, _sz - 2*sizeof(uint32), uncompressed_table, uncompressed_size) != signed(uncompressed_size), E_SHRINKERFAILED); + } + break; + } + + default: + e.error(E_BADSCHEME); + }; + + // Check the uncompressed version number against the original. + if (!e) + // coverity[forward_null : FALSE] - uncompressed_table has already been tested so can't be null + // coverity[checked_return : FALSE] - we test e later + e.test(be::peek<uint32>(uncompressed_table) != version, E_SHRINKERFAILED); + + // Tell the provider to release the compressed form since were replacing + // it anyway. + releaseBuffers(); + + if (e) + { + free(uncompressed_table); + uncompressed_table = 0; + uncompressed_size = 0; + } + + _p = uncompressed_table; + _sz = uncompressed_size; + _compressed = true; + + return e; +} |