493 lines
16 KiB
C++
493 lines
16 KiB
C++
/* GRAPHITE2 LICENSING
|
|
|
|
Copyright 2012, 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 "graphite2/Font.h"
|
|
|
|
#include "inc/Main.h"
|
|
#include "inc/Face.h" //for the tags
|
|
#include "inc/GlyphCache.h"
|
|
#include "inc/GlyphFace.h"
|
|
#include "inc/Endian.h"
|
|
#include "inc/bits.h"
|
|
|
|
using namespace graphite2;
|
|
|
|
namespace
|
|
{
|
|
// Iterator over version 1 or 2 glat entries which consist of a series of
|
|
// +-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+
|
|
// v1 |k|n|v1 |v2 |...|vN | or v2 | k | n |v1 |v2 |...|vN |
|
|
// +-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+
|
|
// variable length structures.
|
|
|
|
template<typename W>
|
|
class _glat_iterator : public std::iterator<std::input_iterator_tag, std::pair<sparse::key_type, sparse::mapped_type> >
|
|
{
|
|
unsigned short key() const { return uint16(be::peek<W>(_e) + _n); }
|
|
unsigned int run() const { return be::peek<W>(_e+sizeof(W)); }
|
|
void advance_entry() { _n = 0; _e = _v; be::skip<W>(_v,2); }
|
|
public:
|
|
_glat_iterator(const void * glat=0) : _e(reinterpret_cast<const byte *>(glat)), _v(_e+2*sizeof(W)), _n(0) {}
|
|
|
|
_glat_iterator<W> & operator ++ () {
|
|
++_n; be::skip<uint16>(_v);
|
|
if (_n == run()) advance_entry();
|
|
return *this;
|
|
}
|
|
_glat_iterator<W> operator ++ (int) { _glat_iterator<W> tmp(*this); operator++(); return tmp; }
|
|
|
|
// This is strictly a >= operator. A true == operator could be
|
|
// implemented that test for overlap but it would be more expensive a
|
|
// test.
|
|
bool operator == (const _glat_iterator<W> & rhs) { return _v >= rhs._e - 1; }
|
|
bool operator != (const _glat_iterator<W> & rhs) { return !operator==(rhs); }
|
|
|
|
value_type operator * () const {
|
|
return value_type(key(), be::peek<uint16>(_v));
|
|
}
|
|
|
|
protected:
|
|
const byte * _e, * _v;
|
|
size_t _n;
|
|
};
|
|
|
|
typedef _glat_iterator<uint8> glat_iterator;
|
|
typedef _glat_iterator<uint16> glat2_iterator;
|
|
}
|
|
|
|
const SlantBox SlantBox::empty = {0,0,0,0};
|
|
|
|
|
|
class GlyphCache::Loader
|
|
{
|
|
public:
|
|
Loader(const Face & face); //return result indicates success. Do not use if failed.
|
|
|
|
operator bool () const throw();
|
|
unsigned short int units_per_em() const throw();
|
|
unsigned short int num_glyphs() const throw();
|
|
unsigned short int num_attrs() const throw();
|
|
bool has_boxes() const throw();
|
|
|
|
const GlyphFace * read_glyph(unsigned short gid, GlyphFace &, int *numsubs) const throw();
|
|
GlyphBox * read_box(uint16 gid, GlyphBox *curr, const GlyphFace & face) const throw();
|
|
|
|
CLASS_NEW_DELETE;
|
|
private:
|
|
Face::Table _head,
|
|
_hhea,
|
|
_hmtx,
|
|
_glyf,
|
|
_loca,
|
|
m_pGlat,
|
|
m_pGloc;
|
|
|
|
bool _long_fmt;
|
|
bool _has_boxes;
|
|
unsigned short _num_glyphs_graphics, //i.e. boundary box and advance
|
|
_num_glyphs_attributes,
|
|
_num_attrs; // number of glyph attributes per glyph
|
|
};
|
|
|
|
|
|
|
|
GlyphCache::GlyphCache(const Face & face, const uint32 face_options)
|
|
: _glyph_loader(new Loader(face)),
|
|
_glyphs(_glyph_loader && *_glyph_loader && _glyph_loader->num_glyphs()
|
|
? grzeroalloc<const GlyphFace *>(_glyph_loader->num_glyphs()) : 0),
|
|
_boxes(_glyph_loader && _glyph_loader->has_boxes() && _glyph_loader->num_glyphs()
|
|
? grzeroalloc<GlyphBox *>(_glyph_loader->num_glyphs()) : 0),
|
|
_num_glyphs(_glyphs ? _glyph_loader->num_glyphs() : 0),
|
|
_num_attrs(_glyphs ? _glyph_loader->num_attrs() : 0),
|
|
_upem(_glyphs ? _glyph_loader->units_per_em() : 0)
|
|
{
|
|
if ((face_options & gr_face_preloadGlyphs) && _glyph_loader && _glyphs)
|
|
{
|
|
int numsubs = 0;
|
|
GlyphFace * const glyphs = new GlyphFace [_num_glyphs];
|
|
if (!glyphs)
|
|
return;
|
|
|
|
// The 0 glyph is definately required.
|
|
_glyphs[0] = _glyph_loader->read_glyph(0, glyphs[0], &numsubs);
|
|
|
|
// glyphs[0] has the same address as the glyphs array just allocated,
|
|
// thus assigning the &glyphs[0] to _glyphs[0] means _glyphs[0] points
|
|
// to the entire array.
|
|
const GlyphFace * loaded = _glyphs[0];
|
|
for (uint16 gid = 1; loaded && gid != _num_glyphs; ++gid)
|
|
_glyphs[gid] = loaded = _glyph_loader->read_glyph(gid, glyphs[gid], &numsubs);
|
|
|
|
if (!loaded)
|
|
{
|
|
_glyphs[0] = 0;
|
|
delete [] glyphs;
|
|
}
|
|
else if (numsubs > 0 && _boxes)
|
|
{
|
|
GlyphBox * boxes = (GlyphBox *)gralloc<char>(_num_glyphs * sizeof(GlyphBox) + numsubs * 8 * sizeof(float));
|
|
GlyphBox * currbox = boxes;
|
|
|
|
for (uint16 gid = 0; currbox && gid != _num_glyphs; ++gid)
|
|
{
|
|
_boxes[gid] = currbox;
|
|
currbox = _glyph_loader->read_box(gid, currbox, *_glyphs[gid]);
|
|
}
|
|
if (!currbox)
|
|
{
|
|
free(boxes);
|
|
_boxes[0] = 0;
|
|
}
|
|
}
|
|
delete _glyph_loader;
|
|
_glyph_loader = 0;
|
|
// coverity[leaked_storage : FALSE] - calling read_glyph on index 0 saved
|
|
// glyphs as _glyphs[0]. Setting _glyph_loader to nullptr here flags that
|
|
// the dtor needs to call delete[] on _glyphs[0] to release what was allocated
|
|
// as glyphs
|
|
}
|
|
|
|
if (_glyphs && glyph(0) == 0)
|
|
{
|
|
free(_glyphs);
|
|
_glyphs = 0;
|
|
if (_boxes)
|
|
{
|
|
free(_boxes);
|
|
_boxes = 0;
|
|
}
|
|
_num_glyphs = _num_attrs = _upem = 0;
|
|
}
|
|
}
|
|
|
|
|
|
GlyphCache::~GlyphCache()
|
|
{
|
|
if (_glyphs)
|
|
{
|
|
if (_glyph_loader)
|
|
{
|
|
const GlyphFace * * g = _glyphs;
|
|
for(unsigned short n = _num_glyphs; n; --n, ++g)
|
|
delete *g;
|
|
}
|
|
else
|
|
delete [] _glyphs[0];
|
|
free(_glyphs);
|
|
}
|
|
if (_boxes)
|
|
{
|
|
if (_glyph_loader)
|
|
{
|
|
GlyphBox * * g = _boxes;
|
|
for (uint16 n = _num_glyphs; n; --n, ++g)
|
|
free(*g);
|
|
}
|
|
else
|
|
free(_boxes[0]);
|
|
free(_boxes);
|
|
}
|
|
delete _glyph_loader;
|
|
}
|
|
|
|
const GlyphFace *GlyphCache::glyph(unsigned short glyphid) const //result may be changed by subsequent call with a different glyphid
|
|
{
|
|
if (glyphid >= numGlyphs())
|
|
return _glyphs[0];
|
|
const GlyphFace * & p = _glyphs[glyphid];
|
|
if (p == 0 && _glyph_loader)
|
|
{
|
|
int numsubs = 0;
|
|
GlyphFace * g = new GlyphFace();
|
|
if (g) p = _glyph_loader->read_glyph(glyphid, *g, &numsubs);
|
|
if (!p)
|
|
{
|
|
delete g;
|
|
return *_glyphs;
|
|
}
|
|
if (_boxes)
|
|
{
|
|
_boxes[glyphid] = (GlyphBox *)gralloc<char>(sizeof(GlyphBox) + 8 * numsubs * sizeof(float));
|
|
if (!_glyph_loader->read_box(glyphid, _boxes[glyphid], *_glyphs[glyphid]))
|
|
{
|
|
free(_boxes[glyphid]);
|
|
_boxes[glyphid] = 0;
|
|
}
|
|
}
|
|
}
|
|
return p;
|
|
}
|
|
|
|
|
|
|
|
GlyphCache::Loader::Loader(const Face & face)
|
|
: _head(face, Tag::head),
|
|
_hhea(face, Tag::hhea),
|
|
_hmtx(face, Tag::hmtx),
|
|
_glyf(face, Tag::glyf),
|
|
_loca(face, Tag::loca),
|
|
_long_fmt(false),
|
|
_has_boxes(false),
|
|
_num_glyphs_graphics(0),
|
|
_num_glyphs_attributes(0),
|
|
_num_attrs(0)
|
|
{
|
|
if (!operator bool())
|
|
return;
|
|
|
|
const Face::Table maxp = Face::Table(face, Tag::maxp);
|
|
if (!maxp) { _head = Face::Table(); return; }
|
|
|
|
_num_glyphs_graphics = static_cast<unsigned short>(TtfUtil::GlyphCount(maxp));
|
|
// This will fail if the number of glyphs is wildly out of range.
|
|
if (_glyf && TtfUtil::LocaLookup(_num_glyphs_graphics-1, _loca, _loca.size(), _head) == size_t(-2))
|
|
{
|
|
_head = Face::Table();
|
|
return;
|
|
}
|
|
|
|
if ((m_pGlat = Face::Table(face, Tag::Glat, 0x00030000)) == NULL
|
|
|| (m_pGloc = Face::Table(face, Tag::Gloc)) == NULL
|
|
|| m_pGloc.size() < 8)
|
|
{
|
|
_head = Face::Table();
|
|
return;
|
|
}
|
|
const byte * p = m_pGloc;
|
|
int version = be::read<uint32>(p);
|
|
const uint16 flags = be::read<uint16>(p);
|
|
_num_attrs = be::read<uint16>(p);
|
|
// We can accurately calculate the number of attributed glyphs by
|
|
// subtracting the length of the attribids array (numAttribs long if present)
|
|
// and dividing by either 2 or 4 depending on shor or lonf format
|
|
_long_fmt = flags & 1;
|
|
ptrdiff_t tmpnumgattrs = (m_pGloc.size()
|
|
- (p - m_pGloc)
|
|
- sizeof(uint16)*(flags & 0x2 ? _num_attrs : 0))
|
|
/ (_long_fmt ? sizeof(uint32) : sizeof(uint16)) - 1;
|
|
|
|
if (version >= 0x00020000 || tmpnumgattrs < 0 || tmpnumgattrs > 65535
|
|
|| _num_attrs == 0 || _num_attrs > 0x3000 // is this hard limit appropriate?
|
|
|| _num_glyphs_graphics > tmpnumgattrs
|
|
|| m_pGlat.size() < 4)
|
|
{
|
|
_head = Face::Table();
|
|
return;
|
|
}
|
|
|
|
_num_glyphs_attributes = static_cast<unsigned short>(tmpnumgattrs);
|
|
p = m_pGlat;
|
|
version = be::read<uint32>(p);
|
|
if (version >= 0x00040000 || (version >= 0x00030000 && m_pGlat.size() < 8)) // reject Glat tables that are too new
|
|
{
|
|
_head = Face::Table();
|
|
return;
|
|
}
|
|
else if (version >= 0x00030000)
|
|
{
|
|
unsigned int glatflags = be::read<uint32>(p);
|
|
_has_boxes = glatflags & 1;
|
|
// delete this once the compiler is fixed
|
|
_has_boxes = true;
|
|
}
|
|
}
|
|
|
|
inline
|
|
GlyphCache::Loader::operator bool () const throw()
|
|
{
|
|
return _head && _hhea && _hmtx && !(bool(_glyf) != bool(_loca));
|
|
}
|
|
|
|
inline
|
|
unsigned short int GlyphCache::Loader::units_per_em() const throw()
|
|
{
|
|
return _head ? TtfUtil::DesignUnits(_head) : 0;
|
|
}
|
|
|
|
inline
|
|
unsigned short int GlyphCache::Loader::num_glyphs() const throw()
|
|
{
|
|
return max(_num_glyphs_graphics, _num_glyphs_attributes);
|
|
}
|
|
|
|
inline
|
|
unsigned short int GlyphCache::Loader::num_attrs() const throw()
|
|
{
|
|
return _num_attrs;
|
|
}
|
|
|
|
inline
|
|
bool GlyphCache::Loader::has_boxes () const throw()
|
|
{
|
|
return _has_boxes;
|
|
}
|
|
|
|
const GlyphFace * GlyphCache::Loader::read_glyph(unsigned short glyphid, GlyphFace & glyph, int *numsubs) const throw()
|
|
{
|
|
Rect bbox;
|
|
Position advance;
|
|
|
|
if (glyphid < _num_glyphs_graphics)
|
|
{
|
|
int nLsb;
|
|
unsigned int nAdvWid;
|
|
if (_glyf)
|
|
{
|
|
int xMin, yMin, xMax, yMax;
|
|
size_t locidx = TtfUtil::LocaLookup(glyphid, _loca, _loca.size(), _head);
|
|
void *pGlyph = TtfUtil::GlyfLookup(_glyf, locidx, _glyf.size());
|
|
|
|
if (pGlyph && TtfUtil::GlyfBox(pGlyph, xMin, yMin, xMax, yMax))
|
|
{
|
|
if ((xMin > xMax) || (yMin > yMax))
|
|
return 0;
|
|
bbox = Rect(Position(static_cast<float>(xMin), static_cast<float>(yMin)),
|
|
Position(static_cast<float>(xMax), static_cast<float>(yMax)));
|
|
}
|
|
}
|
|
if (TtfUtil::HorMetrics(glyphid, _hmtx, _hmtx.size(), _hhea, nLsb, nAdvWid))
|
|
advance = Position(static_cast<float>(nAdvWid), 0);
|
|
}
|
|
|
|
if (glyphid < _num_glyphs_attributes)
|
|
{
|
|
const byte * gloc = m_pGloc;
|
|
size_t glocs = 0, gloce = 0;
|
|
|
|
be::skip<uint32>(gloc);
|
|
be::skip<uint16>(gloc,2);
|
|
if (_long_fmt)
|
|
{
|
|
if (8 + glyphid * sizeof(uint32) > m_pGloc.size())
|
|
return 0;
|
|
be::skip<uint32>(gloc, glyphid);
|
|
glocs = be::read<uint32>(gloc);
|
|
gloce = be::peek<uint32>(gloc);
|
|
}
|
|
else
|
|
{
|
|
if (8 + glyphid * sizeof(uint16) > m_pGloc.size())
|
|
return 0;
|
|
be::skip<uint16>(gloc, glyphid);
|
|
glocs = be::read<uint16>(gloc);
|
|
gloce = be::peek<uint16>(gloc);
|
|
}
|
|
|
|
if (glocs >= m_pGlat.size() - 1 || gloce > m_pGlat.size())
|
|
return 0;
|
|
|
|
const uint32 glat_version = be::peek<uint32>(m_pGlat);
|
|
if (glat_version >= 0x00030000)
|
|
{
|
|
if (glocs >= gloce)
|
|
return 0;
|
|
const byte * p = m_pGlat + glocs;
|
|
uint16 bmap = be::read<uint16>(p);
|
|
int num = bit_set_count((uint32)bmap);
|
|
if (numsubs) *numsubs += num;
|
|
glocs += 6 + 8 * num;
|
|
if (glocs > gloce)
|
|
return 0;
|
|
}
|
|
if (glat_version < 0x00020000)
|
|
{
|
|
if (gloce - glocs < 2*sizeof(byte)+sizeof(uint16)
|
|
|| gloce - glocs > _num_attrs*(2*sizeof(byte)+sizeof(uint16)))
|
|
return 0;
|
|
new (&glyph) GlyphFace(bbox, advance, glat_iterator(m_pGlat + glocs), glat_iterator(m_pGlat + gloce));
|
|
}
|
|
else
|
|
{
|
|
if (gloce - glocs < 3*sizeof(uint16) // can a glyph have no attributes? why not?
|
|
|| gloce - glocs > _num_attrs*3*sizeof(uint16)
|
|
|| glocs > m_pGlat.size() - 2*sizeof(uint16))
|
|
return 0;
|
|
new (&glyph) GlyphFace(bbox, advance, glat2_iterator(m_pGlat + glocs), glat2_iterator(m_pGlat + gloce));
|
|
}
|
|
if (!glyph.attrs() || glyph.attrs().capacity() > _num_attrs)
|
|
return 0;
|
|
}
|
|
return &glyph;
|
|
}
|
|
|
|
inline float scale_to(uint8 t, float zmin, float zmax)
|
|
{
|
|
return (zmin + t * (zmax - zmin) / 255);
|
|
}
|
|
|
|
Rect readbox(Rect &b, uint8 zxmin, uint8 zymin, uint8 zxmax, uint8 zymax)
|
|
{
|
|
return Rect(Position(scale_to(zxmin, b.bl.x, b.tr.x), scale_to(zymin, b.bl.y, b.tr.y)),
|
|
Position(scale_to(zxmax, b.bl.x, b.tr.x), scale_to(zymax, b.bl.y, b.tr.y)));
|
|
}
|
|
|
|
GlyphBox * GlyphCache::Loader::read_box(uint16 gid, GlyphBox *curr, const GlyphFace & glyph) const throw()
|
|
{
|
|
if (gid >= _num_glyphs_attributes) return 0;
|
|
|
|
const byte * gloc = m_pGloc;
|
|
size_t glocs = 0, gloce = 0;
|
|
|
|
be::skip<uint32>(gloc);
|
|
be::skip<uint16>(gloc,2);
|
|
if (_long_fmt)
|
|
{
|
|
be::skip<uint32>(gloc, gid);
|
|
glocs = be::read<uint32>(gloc);
|
|
gloce = be::peek<uint32>(gloc);
|
|
}
|
|
else
|
|
{
|
|
be::skip<uint16>(gloc, gid);
|
|
glocs = be::read<uint16>(gloc);
|
|
gloce = be::peek<uint16>(gloc);
|
|
}
|
|
|
|
if (gloce > m_pGlat.size() || glocs + 6 >= gloce)
|
|
return 0;
|
|
|
|
const byte * p = m_pGlat + glocs;
|
|
uint16 bmap = be::read<uint16>(p);
|
|
int num = bit_set_count((uint32)bmap);
|
|
|
|
Rect bbox = glyph.theBBox();
|
|
Rect diamax(Position(bbox.bl.x + bbox.bl.y, bbox.bl.x - bbox.tr.y),
|
|
Position(bbox.tr.x + bbox.tr.y, bbox.tr.x - bbox.bl.y));
|
|
Rect diabound = readbox(diamax, p[0], p[2], p[1], p[3]);
|
|
::new (curr) GlyphBox(num, bmap, &diabound);
|
|
be::skip<uint8>(p, 4);
|
|
if (glocs + 6 + num * 8 >= gloce)
|
|
return 0;
|
|
|
|
for (int i = 0; i < num * 2; ++i)
|
|
{
|
|
Rect box = readbox((i & 1) ? diamax : bbox, p[0], p[2], p[1], p[3]);
|
|
curr->addSubBox(i >> 1, i & 1, &box);
|
|
be::skip<uint8>(p, 4);
|
|
}
|
|
return (GlyphBox *)((char *)(curr) + sizeof(GlyphBox) + 2 * num * sizeof(Rect));
|
|
}
|