Face.cpp
/* 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"
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_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)
{
if (faceOptions & gr_face_cacheCmap)
m_cmap = new CachedCmap(*this);
else
m_cmap = new DirectCmap(*this);
m_pGlyphFaceCache = new GlyphCache(*this, faceOptions);
if (!m_pGlyphFaceCache
|| m_pGlyphFaceCache->numGlyphs() == 0
|| m_pGlyphFaceCache->unitsPerEm() == 0
|| !m_cmap || !*m_cmap)
return false;
if (faceOptions & gr_face_preloadGlyphs)
nameTable(); // preload the name table along with the glyphs.
return true;
}
bool Face::readGraphite(const Table & silf)
{
const byte * p = silf;
if (!p) return false;
const uint32 version = be::read<uint32>(p);
if (version < 0x00020000) return false;
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++)
{
const uint32 offset = be::read<uint32>(p),
next = i == m_numSilf - 1 ? silf.size() : be::peek<uint32>(p);
if (next > silf.size() || offset >= next)
return false;
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());
res &= aSilf->runGraphite(seg, aSilf->positionPass(), aSilf->numPasses());
#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;
}
