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-rw-r--r--gfx/graphite2/src/Face.cpp370
1 files changed, 370 insertions, 0 deletions
diff --git a/gfx/graphite2/src/Face.cpp b/gfx/graphite2/src/Face.cpp
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+++ b/gfx/graphite2/src/Face.cpp
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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/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;
+}