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 /*  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/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;

 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);

     if (faceOptions & gr_face_cacheCmap)

         m_cmap = new CachedCmap(*this);

     else

         m_cmap = new DirectCmap(*this);

     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)

         || 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)) 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];

     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

     bool res = aSilf->runGraphite(seg, 0, aSilf->justificationPass(), true);

     if (res)

         res = aSilf->runGraphite(seg, aSilf->positionPass(), aSilf->numPasses(), false);

 #if !defined GRAPHITE2_NTRACING

     if (dbgout)

 {

         *dbgout             << json::item

                             << json::close // Close up the passes array

                 << "output" << json::array;

         for(Slot * s = seg->first(); s; s = s->next())

             *dbgout     << dslot(seg, s);

         seg->finalise(0);                   // Call this here to fix up charinfo back indexes.

         *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;

 }

 uint16 Face::getGlyphMetric(uint16 gid, uint8 metric) const

 {

     switch (metrics(metric))

     {

         case kgmetAscent : return m_ascent;

         case kgmetDescent : return m_descent;

         default: 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) throw()

 : _f(&face)

 {

     size_t sz = 0;

     _p = reinterpret_cast<const byte *>((*_f->m_ops.get_table)(_f->m_appFaceHandle, n, &sz));

     _sz = uint32(sz);

     if (!TtfUtil::CheckTable(n, _p, _sz))

     {

         this->~Table();     // Make sure we release the table buffer even if the table filed it's checks

         _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;

 }