harfbuzz/src/hb-ot-cmap-table.hh

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/*
* Copyright © 2014 Google, Inc.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Google Author(s): Behdad Esfahbod
*/
#ifndef HB_OT_CMAP_TABLE_HH
#define HB_OT_CMAP_TABLE_HH
#include "hb-open-type.hh"
#include "hb-set.hh"
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/*
* cmap -- Character to Glyph Index Mapping
* https://docs.microsoft.com/en-us/typography/opentype/spec/cmap
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*/
#define HB_OT_TAG_cmap HB_TAG('c','m','a','p')
namespace OT {
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struct CmapSubtableFormat0
{
bool get_glyph (hb_codepoint_t codepoint, hb_codepoint_t *glyph) const
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{
hb_codepoint_t gid = codepoint < 256 ? glyphIdArray[codepoint] : 0;
if (!gid)
return false;
*glyph = gid;
return true;
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}
void collect_unicodes (hb_set_t *out) const
{
for (unsigned int i = 0; i < 256; i++)
if (glyphIdArray[i])
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out->add (i);
}
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bool sanitize (hb_sanitize_context_t *c) const
{
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TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
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}
protected:
HBUINT16 format; /* Format number is set to 0. */
HBUINT16 length; /* Byte length of this subtable. */
HBUINT16 language; /* Ignore. */
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HBUINT8 glyphIdArray[256];/* An array that maps character
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* code to glyph index values. */
public:
DEFINE_SIZE_STATIC (6 + 256);
};
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struct CmapSubtableFormat4
{
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template<typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
HBUINT16* serialize_endcode_array (hb_serialize_context_t *c,
Iterator it)
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{
HBUINT16 *endCode = c->start_embed<HBUINT16> ();
hb_codepoint_t prev_endcp = 0xFFFF;
+ it
| hb_apply ([&] (const hb_item_type<Iterator> _)
{
if (prev_endcp != 0xFFFF && prev_endcp + 1u != _.first)
{
HBUINT16 end_code;
end_code = prev_endcp;
c->copy<HBUINT16> (end_code);
}
prev_endcp = _.first;
})
;
{
// last endCode
HBUINT16 endcode;
endcode = prev_endcp;
if (unlikely (!c->copy<HBUINT16> (endcode))) return nullptr;
// There must be a final entry with end_code == 0xFFFF.
if (prev_endcp != 0xFFFF)
{
HBUINT16 finalcode;
finalcode = 0xFFFF;
if (unlikely (!c->copy<HBUINT16> (finalcode))) return nullptr;
}
}
return endCode;
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}
template<typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
HBUINT16* serialize_startcode_array (hb_serialize_context_t *c,
Iterator it)
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{
HBUINT16 *startCode = c->start_embed<HBUINT16> ();
hb_codepoint_t prev_cp = 0xFFFF;
+ it
| hb_apply ([&] (const hb_item_type<Iterator> _)
{
if (prev_cp == 0xFFFF || prev_cp + 1u != _.first)
{
HBUINT16 start_code;
start_code = _.first;
c->copy<HBUINT16> (start_code);
}
prev_cp = _.first;
})
;
// There must be a final entry with end_code == 0xFFFF.
if (it.len () == 0 || prev_cp != 0xFFFF)
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{
HBUINT16 finalcode;
finalcode = 0xFFFF;
if (unlikely (!c->copy<HBUINT16> (finalcode))) return nullptr;
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}
return startCode;
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}
template<typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
HBINT16* serialize_idDelta_array (hb_serialize_context_t *c,
Iterator it,
HBUINT16 *endCode,
HBUINT16 *startCode,
unsigned segcount)
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{
unsigned i = 0;
hb_codepoint_t last_gid = 0, start_gid = 0, last_cp = 0xFFFF;
bool use_delta = true;
HBINT16 *idDelta = c->start_embed<HBINT16> ();
if ((char *)idDelta - (char *)startCode != (int) segcount * (int) HBINT16::static_size)
return nullptr;
+ it
| hb_apply ([&] (const hb_item_type<Iterator> _)
{
if (_.first == startCode[i])
{
use_delta = true;
start_gid = _.second;
}
else if (_.second != last_gid + 1) use_delta = false;
if (_.first == endCode[i])
{
HBINT16 delta;
if (use_delta) delta = (int)start_gid - (int)startCode[i];
else delta = 0;
c->copy<HBINT16> (delta);
i++;
}
last_gid = _.second;
last_cp = _.first;
})
;
if (it.len () == 0 || last_cp != 0xFFFF)
{
HBINT16 delta;
delta = 1;
if (unlikely (!c->copy<HBINT16> (delta))) return nullptr;
}
return idDelta;
}
template<typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
HBUINT16* serialize_rangeoffset_glyid (hb_serialize_context_t *c,
Iterator it,
HBUINT16 *endCode,
HBUINT16 *startCode,
HBINT16 *idDelta,
unsigned segcount)
{
HBUINT16 *idRangeOffset = c->allocate_size<HBUINT16> (HBUINT16::static_size * segcount);
if (unlikely (!c->check_success (idRangeOffset))) return nullptr;
if (unlikely ((char *)idRangeOffset - (char *)idDelta != (int) segcount * (int) HBINT16::static_size)) return nullptr;
+ hb_range (segcount)
| hb_filter ([&] (const unsigned _) { return idDelta[_] == 0; })
| hb_apply ([&] (const unsigned i)
{
idRangeOffset[i] = 2 * (c->start_embed<HBUINT16> () - idRangeOffset - i);
+ it
| hb_filter ([&] (const hb_item_type<Iterator> _) { return _.first >= startCode[i] && _.first <= endCode[i]; })
| hb_apply ([&] (const hb_item_type<Iterator> _)
{
HBUINT16 glyID;
glyID = _.second;
c->copy<HBUINT16> (glyID);
})
;
})
;
return idRangeOffset;
}
template<typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
void serialize (hb_serialize_context_t *c,
Iterator it)
{
unsigned table_initpos = c->length ();
if (unlikely (!c->extend_min (*this))) return;
this->format = 4;
//serialize endCode[]
HBUINT16 *endCode = serialize_endcode_array (c, it);
if (unlikely (!endCode)) return;
unsigned segcount = (c->length () - min_size) / HBUINT16::static_size;
// 2 bytes of padding.
if (unlikely (!c->allocate_size<HBUINT16> (HBUINT16::static_size))) return; // 2 bytes of padding.
// serialize startCode[]
HBUINT16 *startCode = serialize_startcode_array (c, it);
if (unlikely (!startCode)) return;
//serialize idDelta[]
HBINT16 *idDelta = serialize_idDelta_array (c, it, endCode, startCode, segcount);
if (unlikely (!idDelta)) return;
HBUINT16 *idRangeOffset = serialize_rangeoffset_glyid (c, it, endCode, startCode, idDelta, segcount);
if (unlikely (!c->check_success (idRangeOffset))) return;
if (unlikely (!c->check_assign(this->length, c->length () - table_initpos))) return;
this->segCountX2 = segcount * 2;
this->entrySelector = hb_max (1u, hb_bit_storage (segcount)) - 1;
this->searchRange = 2 * (1u << this->entrySelector);
this->rangeShift = segcount * 2 > this->searchRange
? 2 * segcount - this->searchRange
: 0;
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}
struct accelerator_t
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{
accelerator_t () {}
accelerator_t (const CmapSubtableFormat4 *subtable) { init (subtable); }
~accelerator_t () { fini (); }
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void init (const CmapSubtableFormat4 *subtable)
{
segCount = subtable->segCountX2 / 2;
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endCount = subtable->values.arrayZ;
startCount = endCount + segCount + 1;
idDelta = startCount + segCount;
idRangeOffset = idDelta + segCount;
glyphIdArray = idRangeOffset + segCount;
glyphIdArrayLength = (subtable->length - 16 - 8 * segCount) / 2;
}
void fini () {}
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bool get_glyph (hb_codepoint_t codepoint, hb_codepoint_t *glyph) const
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{
/* Custom two-array bsearch. */
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int min = 0, max = (int) this->segCount - 1;
const HBUINT16 *startCount = this->startCount;
const HBUINT16 *endCount = this->endCount;
unsigned int i;
while (min <= max)
{
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int mid = ((unsigned int) min + (unsigned int) max) / 2;
if (codepoint < startCount[mid])
max = mid - 1;
else if (codepoint > endCount[mid])
min = mid + 1;
else
{
i = mid;
goto found;
}
}
return false;
found:
hb_codepoint_t gid;
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unsigned int rangeOffset = this->idRangeOffset[i];
if (rangeOffset == 0)
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gid = codepoint + this->idDelta[i];
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else
{
/* Somebody has been smoking... */
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unsigned int index = rangeOffset / 2 + (codepoint - this->startCount[i]) + i - this->segCount;
if (unlikely (index >= this->glyphIdArrayLength))
return false;
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gid = this->glyphIdArray[index];
if (unlikely (!gid))
return false;
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gid += this->idDelta[i];
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}
gid &= 0xFFFFu;
if (!gid)
return false;
*glyph = gid;
return true;
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}
HB_INTERNAL static bool get_glyph_func (const void *obj, hb_codepoint_t codepoint, hb_codepoint_t *glyph)
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{ return ((const accelerator_t *) obj)->get_glyph (codepoint, glyph); }
void collect_unicodes (hb_set_t *out) const
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{
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unsigned int count = this->segCount;
if (count && this->startCount[count - 1] == 0xFFFFu)
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count--; /* Skip sentinel segment. */
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for (unsigned int i = 0; i < count; i++)
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{
unsigned int rangeOffset = this->idRangeOffset[i];
if (rangeOffset == 0)
out->add_range (this->startCount[i], this->endCount[i]);
else
{
for (hb_codepoint_t codepoint = this->startCount[i];
codepoint <= this->endCount[i];
codepoint++)
{
unsigned int index = rangeOffset / 2 + (codepoint - this->startCount[i]) + i - this->segCount;
if (unlikely (index >= this->glyphIdArrayLength))
break;
hb_codepoint_t gid = this->glyphIdArray[index];
if (unlikely (!gid))
continue;
out->add (codepoint);
}
}
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}
}
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const HBUINT16 *endCount;
const HBUINT16 *startCount;
const HBUINT16 *idDelta;
const HBUINT16 *idRangeOffset;
const HBUINT16 *glyphIdArray;
unsigned int segCount;
unsigned int glyphIdArrayLength;
};
bool get_glyph (hb_codepoint_t codepoint, hb_codepoint_t *glyph) const
{
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accelerator_t accel (this);
return accel.get_glyph_func (&accel, codepoint, glyph);
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}
void collect_unicodes (hb_set_t *out) const
{
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accelerator_t accel (this);
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accel.collect_unicodes (out);
}
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bool sanitize (hb_sanitize_context_t *c) const
{
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TRACE_SANITIZE (this);
if (unlikely (!c->check_struct (this)))
return_trace (false);
if (unlikely (!c->check_range (this, length)))
{
/* Some broken fonts have too long of a "length" value.
* If that is the case, just change the value to truncate
* the subtable at the end of the blob. */
uint16_t new_length = (uint16_t) hb_min ((uintptr_t) 65535,
(uintptr_t) (c->end -
(char *) this));
if (!c->try_set (&length, new_length))
return_trace (false);
}
return_trace (16 + 4 * (unsigned int) segCountX2 <= length);
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}
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protected:
HBUINT16 format; /* Format number is set to 4. */
HBUINT16 length; /* This is the length in bytes of the
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* subtable. */
HBUINT16 language; /* Ignore. */
HBUINT16 segCountX2; /* 2 x segCount. */
HBUINT16 searchRange; /* 2 * (2**floor(log2(segCount))) */
HBUINT16 entrySelector; /* log2(searchRange/2) */
HBUINT16 rangeShift; /* 2 x segCount - searchRange */
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UnsizedArrayOf<HBUINT16>
values;
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#if 0
HBUINT16 endCount[segCount]; /* End characterCode for each segment,
* last=0xFFFFu. */
HBUINT16 reservedPad; /* Set to 0. */
HBUINT16 startCount[segCount]; /* Start character code for each segment. */
HBINT16 idDelta[segCount]; /* Delta for all character codes in segment. */
HBUINT16 idRangeOffset[segCount];/* Offsets into glyphIdArray or 0 */
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UnsizedArrayOf<HBUINT16>
glyphIdArray; /* Glyph index array (arbitrary length) */
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#endif
public:
DEFINE_SIZE_ARRAY (14, values);
};
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struct CmapSubtableLongGroup
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{
friend struct CmapSubtableFormat12;
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friend struct CmapSubtableFormat13;
template<typename U>
friend struct CmapSubtableLongSegmented;
friend struct cmap;
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int cmp (hb_codepoint_t codepoint) const
{
if (codepoint < startCharCode) return -1;
if (codepoint > endCharCode) return +1;
return 0;
}
bool sanitize (hb_sanitize_context_t *c) const
{
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TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
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}
private:
HBUINT32 startCharCode; /* First character code in this group. */
HBUINT32 endCharCode; /* Last character code in this group. */
HBUINT32 glyphID; /* Glyph index; interpretation depends on
* subtable format. */
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public:
DEFINE_SIZE_STATIC (12);
};
DECLARE_NULL_NAMESPACE_BYTES (OT, CmapSubtableLongGroup);
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template <typename UINT>
struct CmapSubtableTrimmed
{
bool get_glyph (hb_codepoint_t codepoint, hb_codepoint_t *glyph) const
{
/* Rely on our implicit array bound-checking. */
hb_codepoint_t gid = glyphIdArray[codepoint - startCharCode];
if (!gid)
return false;
*glyph = gid;
return true;
}
void collect_unicodes (hb_set_t *out) const
{
hb_codepoint_t start = startCharCode;
unsigned int count = glyphIdArray.len;
for (unsigned int i = 0; i < count; i++)
if (glyphIdArray[i])
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out->add (start + i);
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) && glyphIdArray.sanitize (c));
}
protected:
UINT formatReserved; /* Subtable format and (maybe) padding. */
UINT length; /* Byte length of this subtable. */
UINT language; /* Ignore. */
UINT startCharCode; /* First character code covered. */
ArrayOf<HBGlyphID, UINT>
glyphIdArray; /* Array of glyph index values for character
* codes in the range. */
public:
DEFINE_SIZE_ARRAY (5 * sizeof (UINT), glyphIdArray);
};
struct CmapSubtableFormat6 : CmapSubtableTrimmed<HBUINT16> {};
struct CmapSubtableFormat10 : CmapSubtableTrimmed<HBUINT32 > {};
template <typename T>
struct CmapSubtableLongSegmented
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{
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friend struct cmap;
bool get_glyph (hb_codepoint_t codepoint, hb_codepoint_t *glyph) const
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{
hb_codepoint_t gid = T::group_get_glyph (groups.bsearch (codepoint), codepoint);
if (!gid)
return false;
*glyph = gid;
return true;
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}
void collect_unicodes (hb_set_t *out) const
{
for (unsigned int i = 0; i < this->groups.len; i++) {
out->add_range (this->groups[i].startCharCode,
hb_min ((hb_codepoint_t) this->groups[i].endCharCode,
(hb_codepoint_t) HB_UNICODE_MAX));
}
}
bool sanitize (hb_sanitize_context_t *c) const
{
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TRACE_SANITIZE (this);
return_trace (c->check_struct (this) && groups.sanitize (c));
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}
protected:
HBUINT16 format; /* Subtable format; set to 12. */
HBUINT16 reserved; /* Reserved; set to 0. */
HBUINT32 length; /* Byte length of this subtable. */
HBUINT32 language; /* Ignore. */
SortedArrayOf<CmapSubtableLongGroup, HBUINT32>
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groups; /* Groupings. */
public:
DEFINE_SIZE_ARRAY (16, groups);
};
struct CmapSubtableFormat12 : CmapSubtableLongSegmented<CmapSubtableFormat12>
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{
static hb_codepoint_t group_get_glyph (const CmapSubtableLongGroup &group,
hb_codepoint_t u)
{ return likely (group.startCharCode <= group.endCharCode) ?
group.glyphID + (u - group.startCharCode) : 0; }
template<typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
void serialize (hb_serialize_context_t *c,
Iterator it)
{
if (it.len () == 0) return;
unsigned table_initpos = c->length ();
if (unlikely (!c->extend_min (*this))) return;
hb_codepoint_t startCharCode = 0xFFFF, endCharCode = 0xFFFF;
hb_codepoint_t glyphID = 0;
+ it
| hb_apply ([&] (const hb_item_type<Iterator> _)
{
if (startCharCode == 0xFFFF)
{
startCharCode = _.first;
endCharCode = _.first;
glyphID = _.second;
}
else if (!_is_gid_consecutive (endCharCode, startCharCode, glyphID, _.first, _.second))
{
CmapSubtableLongGroup grouprecord;
grouprecord.startCharCode = startCharCode;
grouprecord.endCharCode = endCharCode;
grouprecord.glyphID = glyphID;
c->copy<CmapSubtableLongGroup> (grouprecord);
startCharCode = _.first;
endCharCode = _.first;
glyphID = _.second;
}
else
{
endCharCode = _.first;
}
})
;
CmapSubtableLongGroup record;
record.startCharCode = startCharCode;
record.endCharCode = endCharCode;
record.glyphID = glyphID;
c->copy<CmapSubtableLongGroup> (record);
this->format = 12;
this->reserved = 0;
this->length = c->length () - table_initpos;
this->groups.len = (this->length - min_size)/CmapSubtableLongGroup::static_size;
}
static size_t get_sub_table_size (const hb_sorted_vector_t<CmapSubtableLongGroup> &groups_data)
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{ return 16 + 12 * groups_data.length; }
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private:
static bool _is_gid_consecutive (hb_codepoint_t endCharCode,
hb_codepoint_t startCharCode,
hb_codepoint_t glyphID,
hb_codepoint_t cp,
hb_codepoint_t new_gid)
{
return (cp - 1 == endCharCode) &&
new_gid == glyphID + (cp - startCharCode);
}
};
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struct CmapSubtableFormat13 : CmapSubtableLongSegmented<CmapSubtableFormat13>
{
static hb_codepoint_t group_get_glyph (const CmapSubtableLongGroup &group,
hb_codepoint_t u HB_UNUSED)
{ return group.glyphID; }
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};
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typedef enum
{
GLYPH_VARIANT_NOT_FOUND = 0,
GLYPH_VARIANT_FOUND = 1,
GLYPH_VARIANT_USE_DEFAULT = 2
} glyph_variant_t;
struct UnicodeValueRange
{
int cmp (const hb_codepoint_t &codepoint) const
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{
if (codepoint < startUnicodeValue) return -1;
if (codepoint > startUnicodeValue + additionalCount) return +1;
return 0;
}
bool sanitize (hb_sanitize_context_t *c) const
{
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TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
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}
HBUINT24 startUnicodeValue; /* First value in this range. */
HBUINT8 additionalCount; /* Number of additional values in this
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* range. */
public:
DEFINE_SIZE_STATIC (4);
};
struct DefaultUVS : SortedArrayOf<UnicodeValueRange, HBUINT32>
{
void collect_unicodes (hb_set_t *out) const
{
unsigned int count = len;
for (unsigned int i = 0; i < count; i++)
{
hb_codepoint_t first = arrayZ[i].startUnicodeValue;
hb_codepoint_t last = hb_min ((hb_codepoint_t) (first + arrayZ[i].additionalCount),
(hb_codepoint_t) HB_UNICODE_MAX);
out->add_range (first, last);
}
}
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DefaultUVS* copy (hb_serialize_context_t *c,
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const hb_set_t *unicodes) const
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{
DefaultUVS *out = c->start_embed<DefaultUVS> ();
if (unlikely (!out)) return nullptr;
auto snap = c->snapshot ();
HBUINT32 len;
len = 0;
if (unlikely (!c->copy<HBUINT32> (len))) return nullptr;
unsigned init_len = c->length ();
hb_codepoint_t lastCode = HB_MAP_VALUE_INVALID;
int count = -1;
for (const UnicodeValueRange& _ : as_array ())
{
for (const unsigned addcnt : hb_range ((unsigned) _.additionalCount + 1))
{
unsigned curEntry = (unsigned) _.startUnicodeValue + addcnt;
if (!unicodes->has (curEntry)) continue;
count += 1;
if (lastCode == HB_MAP_VALUE_INVALID)
lastCode = curEntry;
else if (lastCode + count != curEntry)
{
UnicodeValueRange rec;
rec.startUnicodeValue = lastCode;
rec.additionalCount = count - 1;
c->copy<UnicodeValueRange> (rec);
lastCode = curEntry;
count = 0;
}
}
}
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if (lastCode != HB_MAP_VALUE_INVALID)
{
UnicodeValueRange rec;
rec.startUnicodeValue = lastCode;
rec.additionalCount = count;
c->copy<UnicodeValueRange> (rec);
}
if (c->length () - init_len == 0)
{
c->revert (snap);
return nullptr;
}
else
{
if (unlikely (!c->check_assign (out->len, (c->length () - init_len) / UnicodeValueRange::static_size))) return nullptr;
return out;
}
}
public:
DEFINE_SIZE_ARRAY (4, *this);
};
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struct UVSMapping
{
int cmp (const hb_codepoint_t &codepoint) const
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{ return unicodeValue.cmp (codepoint); }
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bool sanitize (hb_sanitize_context_t *c) const
{
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TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
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}
HBUINT24 unicodeValue; /* Base Unicode value of the UVS */
HBGlyphID glyphID; /* Glyph ID of the UVS */
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public:
DEFINE_SIZE_STATIC (5);
};
struct NonDefaultUVS : SortedArrayOf<UVSMapping, HBUINT32>
{
void collect_unicodes (hb_set_t *out) const
{
unsigned int count = len;
for (unsigned int i = 0; i < count; i++)
out->add (arrayZ[i].glyphID);
}
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void closure_glyphs (const hb_set_t *unicodes,
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hb_set_t *glyphset) const
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{
+ as_array ()
| hb_filter (unicodes, &UVSMapping::unicodeValue)
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| hb_map (&UVSMapping::glyphID)
| hb_sink (glyphset)
;
}
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NonDefaultUVS* copy (hb_serialize_context_t *c,
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const hb_set_t *unicodes,
const hb_set_t *glyphs,
const hb_map_t *glyph_map) const
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{
NonDefaultUVS *out = c->start_embed<NonDefaultUVS> ();
if (unlikely (!out)) return nullptr;
auto it =
+ as_array ()
| hb_filter ([&] (const UVSMapping& _)
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{
return unicodes->has (_.unicodeValue) || glyphs->has (_.glyphID);
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})
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;
if (!it) return nullptr;
HBUINT32 len;
len = it.len ();
if (unlikely (!c->copy<HBUINT32> (len))) return nullptr;
for (const UVSMapping& _ : it)
{
UVSMapping mapping;
mapping.unicodeValue = _.unicodeValue;
mapping.glyphID = glyph_map->get (_.glyphID);
c->copy<UVSMapping> (mapping);
}
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return out;
}
public:
DEFINE_SIZE_ARRAY (4, *this);
};
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struct VariationSelectorRecord
{
glyph_variant_t get_glyph (hb_codepoint_t codepoint,
hb_codepoint_t *glyph,
const void *base) const
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{
if ((base+defaultUVS).bfind (codepoint))
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return GLYPH_VARIANT_USE_DEFAULT;
const UVSMapping &nonDefault = (base+nonDefaultUVS).bsearch (codepoint);
if (nonDefault.glyphID)
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{
*glyph = nonDefault.glyphID;
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return GLYPH_VARIANT_FOUND;
}
return GLYPH_VARIANT_NOT_FOUND;
}
void collect_unicodes (hb_set_t *out, const void *base) const
{
(base+defaultUVS).collect_unicodes (out);
(base+nonDefaultUVS).collect_unicodes (out);
}
int cmp (const hb_codepoint_t &variation_selector) const
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{ return varSelector.cmp (variation_selector); }
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bool sanitize (hb_sanitize_context_t *c, const void *base) const
{
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TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
defaultUVS.sanitize (c, base) &&
nonDefaultUVS.sanitize (c, base));
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}
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VariationSelectorRecord* copy (hb_serialize_context_t *c,
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const hb_set_t *unicodes,
const hb_set_t *glyphs,
const hb_map_t *glyph_map,
const void *src_base,
const void *dst_base) const
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{
auto snap = c->snapshot ();
auto *out = c->embed<VariationSelectorRecord> (*this);
if (unlikely (!out)) return nullptr;
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out->defaultUVS = 0;
out->nonDefaultUVS = 0;
bool drop = true;
if (defaultUVS != 0)
{
c->push ();
if (c->copy (src_base+defaultUVS, unicodes))
{
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c->add_link (out->defaultUVS, c->pop_pack (), dst_base);
drop = false;
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}
else c->pop_discard ();
}
if (nonDefaultUVS != 0)
{
c->push ();
if (c->copy (src_base+nonDefaultUVS, unicodes, glyphs, glyph_map))
{
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c->add_link (out->nonDefaultUVS, c->pop_pack (), dst_base);
drop = false;
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}
else c->pop_discard ();
}
if (drop)
{
c->revert (snap);
return nullptr;
}
else return out;
}
HBUINT24 varSelector; /* Variation selector. */
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LOffsetTo<DefaultUVS>
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defaultUVS; /* Offset to Default UVS Table. May be 0. */
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LOffsetTo<NonDefaultUVS>
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nonDefaultUVS; /* Offset to Non-Default UVS Table. May be 0. */
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public:
DEFINE_SIZE_STATIC (11);
};
struct CmapSubtableFormat14
{
glyph_variant_t get_glyph_variant (hb_codepoint_t codepoint,
hb_codepoint_t variation_selector,
hb_codepoint_t *glyph) const
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{ return record.bsearch (variation_selector).get_glyph (codepoint, glyph, this); }
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void collect_variation_selectors (hb_set_t *out) const
{
unsigned int count = record.len;
for (unsigned int i = 0; i < count; i++)
out->add (record.arrayZ[i].varSelector);
}
void collect_variation_unicodes (hb_codepoint_t variation_selector,
hb_set_t *out) const
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{ record.bsearch (variation_selector).collect_unicodes (out, this); }
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void serialize (hb_serialize_context_t *c,
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const hb_set_t *unicodes,
const hb_set_t *glyphs,
const hb_map_t *glyph_map,
const void *src_base)
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{
auto snap = c->snapshot ();
unsigned table_initpos = c->length ();
const char* init_tail = c->tail;
if (unlikely (!c->extend_min (*this))) return;
this->format = 14;
const CmapSubtableFormat14 *src_tbl = reinterpret_cast<const CmapSubtableFormat14*> (src_base);
for (const VariationSelectorRecord& _ : src_tbl->record)
c->copy (_, unicodes, glyphs, glyph_map, src_base, this);
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if (c->length () - table_initpos == CmapSubtableFormat14::min_size)
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c->revert (snap);
else
{
int tail_len = init_tail - c->tail;
c->check_assign (this->length, c->length () - table_initpos + tail_len);
c->check_assign (this->record.len, (c->length () - table_initpos - CmapSubtableFormat14::min_size) / VariationSelectorRecord::static_size);
}
}
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void closure_glyphs (const hb_set_t *unicodes,
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hb_set_t *glyphset) const
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{
+ hb_iter (record)
| hb_filter (hb_bool, &VariationSelectorRecord::nonDefaultUVS)
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| hb_map (&VariationSelectorRecord::nonDefaultUVS)
| hb_map (hb_add (this))
| hb_apply ([=] (const NonDefaultUVS& _) { _.closure_glyphs (unicodes, glyphset); })
;
}
bool sanitize (hb_sanitize_context_t *c) const
{
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TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
record.sanitize (c, this));
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}
protected:
HBUINT16 format; /* Format number is set to 14. */
HBUINT32 length; /* Byte length of this subtable. */
SortedArrayOf<VariationSelectorRecord, HBUINT32>
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record; /* Variation selector records; sorted
* in increasing order of `varSelector'. */
public:
DEFINE_SIZE_ARRAY (10, record);
};
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struct CmapSubtable
{
/* Note: We intentionally do NOT implement subtable formats 2 and 8. */
bool get_glyph (hb_codepoint_t codepoint,
hb_codepoint_t *glyph) const
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{
switch (u.format) {
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case 0: return u.format0 .get_glyph (codepoint, glyph);
case 4: return u.format4 .get_glyph (codepoint, glyph);
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case 6: return u.format6 .get_glyph (codepoint, glyph);
case 10: return u.format10.get_glyph (codepoint, glyph);
case 12: return u.format12.get_glyph (codepoint, glyph);
case 13: return u.format13.get_glyph (codepoint, glyph);
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case 14:
default: return false;
}
}
void collect_unicodes (hb_set_t *out) const
{
switch (u.format) {
case 0: u.format0 .collect_unicodes (out); return;
case 4: u.format4 .collect_unicodes (out); return;
case 6: u.format6 .collect_unicodes (out); return;
case 10: u.format10.collect_unicodes (out); return;
case 12: u.format12.collect_unicodes (out); return;
case 13: u.format13.collect_unicodes (out); return;
case 14:
default: return;
}
}
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template<typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
void serialize (hb_serialize_context_t *c,
Iterator it,
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unsigned format,
const hb_subset_plan_t *plan,
const void *src_base)
{
switch (format) {
case 4: u.format4.serialize (c, it); return;
case 12: u.format12.serialize (c, it); return;
case 14: u.format14.serialize (c, plan->unicodes, plan->_glyphset, plan->glyph_map, src_base); return;
default: return;
}
}
bool sanitize (hb_sanitize_context_t *c) const
{
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TRACE_SANITIZE (this);
if (!u.format.sanitize (c)) return_trace (false);
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switch (u.format) {
case 0: return_trace (u.format0 .sanitize (c));
case 4: return_trace (u.format4 .sanitize (c));
case 6: return_trace (u.format6 .sanitize (c));
case 10: return_trace (u.format10.sanitize (c));
case 12: return_trace (u.format12.sanitize (c));
case 13: return_trace (u.format13.sanitize (c));
case 14: return_trace (u.format14.sanitize (c));
default:return_trace (true);
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}
}
public:
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union {
HBUINT16 format; /* Format identifier */
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CmapSubtableFormat0 format0;
CmapSubtableFormat4 format4;
CmapSubtableFormat6 format6;
CmapSubtableFormat10 format10;
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CmapSubtableFormat12 format12;
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CmapSubtableFormat13 format13;
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CmapSubtableFormat14 format14;
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} u;
public:
DEFINE_SIZE_UNION (2, format);
};
struct EncodingRecord
{
int cmp (const EncodingRecord &other) const
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{
int ret;
ret = platformID.cmp (other.platformID);
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if (ret) return ret;
ret = encodingID.cmp (other.encodingID);
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if (ret) return ret;
return 0;
}
bool sanitize (hb_sanitize_context_t *c, const void *base) const
{
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TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
subtable.sanitize (c, base));
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}
template<typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
EncodingRecord* copy (hb_serialize_context_t *c,
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Iterator it,
unsigned format,
const void *src_base,
const void *dst_base,
const hb_subset_plan_t *plan,
/* INOUT */ unsigned *objidx) const
{
TRACE_SERIALIZE (this);
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auto snap = c->snapshot ();
auto *out = c->embed (this);
if (unlikely (!out)) return_trace (nullptr);
out->subtable = 0;
if (*objidx == 0)
{
CmapSubtable *cmapsubtable = c->push<CmapSubtable> ();
unsigned origin_length = c->length ();
cmapsubtable->serialize (c, it, format, plan, &(src_base+subtable));
if (c->length () - origin_length > 0) *objidx = c->pop_pack ();
else c->pop_discard ();
}
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if (*objidx == 0)
{
c->revert (snap);
return_trace (nullptr);
}
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c->add_link (out->subtable, *objidx, dst_base);
return_trace (out);
}
HBUINT16 platformID; /* Platform ID. */
HBUINT16 encodingID; /* Platform-specific encoding ID. */
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LOffsetTo<CmapSubtable>
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subtable; /* Byte offset from beginning of table to the subtable for this encoding. */
public:
DEFINE_SIZE_STATIC (8);
};
struct cmap
{
static constexpr hb_tag_t tableTag = HB_OT_TAG_cmap;
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template<typename Iterator, typename EncodingRecIter,
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hb_requires (hb_is_iterator (Iterator))>
void serialize (hb_serialize_context_t *c,
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Iterator it,
EncodingRecIter encodingrec_iter,
const void *src_base,
const hb_subset_plan_t *plan)
{
if (unlikely (!c->extend_min ((*this)))) return;
this->version = 0;
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unsigned format4objidx = 0, format12objidx = 0, format14objidx = 0;
for (const EncodingRecord& _ : encodingrec_iter)
{
unsigned format = (src_base+_.subtable).u.format;
if (format == 4) c->copy (_, it, 4u, src_base, this, plan, &format4objidx);
else if (format == 12) c->copy (_, it, 12u, src_base, this, plan, &format12objidx);
else if (format == 14) c->copy (_, it, 14u, src_base, this, plan, &format14objidx);
}
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c->check_assign(this->encodingRecord.len, (c->length () - cmap::min_size)/EncodingRecord::static_size);
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}
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void closure_glyphs (const hb_set_t *unicodes,
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hb_set_t *glyphset) const
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{
+ hb_iter (encodingRecord)
| hb_map (&EncodingRecord::subtable)
| hb_map (hb_add (this))
| hb_filter ([&] (const CmapSubtable& _) { return _.u.format == 14; })
| hb_apply ([=] (const CmapSubtable& _) { _.u.format14.closure_glyphs (unicodes, glyphset); })
;
}
bool subset (hb_subset_context_t *c) const
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{
TRACE_SUBSET (this);
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cmap *cmap_prime = c->serializer->start_embed<cmap> ();
if (unlikely (!c->serializer->check_success (cmap_prime))) return_trace (false);
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auto encodingrec_iter =
+ hb_iter (encodingRecord)
| hb_filter ([&] (const EncodingRecord& _)
{
if ((_.platformID == 0 && _.encodingID == 3) ||
(_.platformID == 0 && _.encodingID == 4) ||
(_.platformID == 3 && _.encodingID == 1) ||
(_.platformID == 3 && _.encodingID == 10) ||
(this + _.subtable).u.format == 14)
return true;
return false;
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})
;
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if (unlikely (!encodingrec_iter.len ())) return_trace (false);
const EncodingRecord *unicode_bmp= nullptr, *unicode_ucs4 = nullptr, *ms_bmp = nullptr, *ms_ucs4 = nullptr;
bool has_format12 = false;
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for (const EncodingRecord& _ : encodingrec_iter)
{
unsigned format = (this + _.subtable).u.format;
if (format == 12) has_format12 = true;
const EncodingRecord *table = hb_addressof (_);
if (_.platformID == 0 && _.encodingID == 3) unicode_bmp = table;
else if (_.platformID == 0 && _.encodingID == 4) unicode_ucs4 = table;
else if (_.platformID == 3 && _.encodingID == 1) ms_bmp = table;
else if (_.platformID == 3 && _.encodingID == 10) ms_ucs4 = table;
}
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if (unlikely (!unicode_bmp && !ms_bmp)) return_trace (false);
if (unlikely (has_format12 && (!unicode_ucs4 && !ms_ucs4))) return_trace (false);
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auto it =
+ hb_iter (c->plan->unicodes)
| hb_map ([&] (hb_codepoint_t _)
{
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hb_codepoint_t new_gid = HB_MAP_VALUE_INVALID;
c->plan->new_gid_for_codepoint (_, &new_gid);
return hb_pair_t<hb_codepoint_t, hb_codepoint_t> (_, new_gid);
})
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| hb_filter ([&] (const hb_pair_t<hb_codepoint_t, hb_codepoint_t> _)
{ return (_.second != HB_MAP_VALUE_INVALID); })
;
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cmap_prime->serialize (c->serializer, it, encodingrec_iter, this, c->plan);
return_trace (true);
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}
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const CmapSubtable *find_best_subtable (bool *symbol = nullptr) const
{
if (symbol) *symbol = false;
const CmapSubtable *subtable;
/* Symbol subtable.
* Prefer symbol if available.
* https://github.com/harfbuzz/harfbuzz/issues/1918 */
if ((subtable = this->find_subtable (3, 0)))
{
if (symbol) *symbol = true;
return subtable;
}
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/* 32-bit subtables. */
if ((subtable = this->find_subtable (3, 10))) return subtable;
if ((subtable = this->find_subtable (0, 6))) return subtable;
if ((subtable = this->find_subtable (0, 4))) return subtable;
/* 16-bit subtables. */
if ((subtable = this->find_subtable (3, 1))) return subtable;
if ((subtable = this->find_subtable (0, 3))) return subtable;
if ((subtable = this->find_subtable (0, 2))) return subtable;
if ((subtable = this->find_subtable (0, 1))) return subtable;
if ((subtable = this->find_subtable (0, 0))) return subtable;
/* Meh. */
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return &Null (CmapSubtable);
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}
struct accelerator_t
{
void init (hb_face_t *face)
{
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this->table = hb_sanitize_context_t ().reference_table<cmap> (face);
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bool symbol;
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this->subtable = table->find_best_subtable (&symbol);
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this->subtable_uvs = &Null (CmapSubtableFormat14);
{
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const CmapSubtable *st = table->find_subtable (0, 5);
if (st && st->u.format == 14)
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subtable_uvs = &st->u.format14;
}
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this->get_glyph_data = subtable;
if (unlikely (symbol))
this->get_glyph_funcZ = get_glyph_from_symbol<CmapSubtable>;
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else
{
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switch (subtable->u.format) {
/* Accelerate format 4 and format 12. */
default:
this->get_glyph_funcZ = get_glyph_from<CmapSubtable>;
break;
case 12:
this->get_glyph_funcZ = get_glyph_from<CmapSubtableFormat12>;
break;
case 4:
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{
this->format4_accel.init (&subtable->u.format4);
this->get_glyph_data = &this->format4_accel;
this->get_glyph_funcZ = this->format4_accel.get_glyph_func;
break;
}
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}
}
}
void fini () { this->table.destroy (); }
bool get_nominal_glyph (hb_codepoint_t unicode,
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hb_codepoint_t *glyph) const
{
if (unlikely (!this->get_glyph_funcZ)) return false;
return this->get_glyph_funcZ (this->get_glyph_data, unicode, glyph);
}
unsigned int get_nominal_glyphs (unsigned int count,
const hb_codepoint_t *first_unicode,
unsigned int unicode_stride,
hb_codepoint_t *first_glyph,
unsigned int glyph_stride) const
{
if (unlikely (!this->get_glyph_funcZ)) return 0;
hb_cmap_get_glyph_func_t get_glyph_funcZ = this->get_glyph_funcZ;
const void *get_glyph_data = this->get_glyph_data;
unsigned int done;
for (done = 0;
done < count && get_glyph_funcZ (get_glyph_data, *first_unicode, first_glyph);
done++)
{
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first_unicode = &StructAtOffsetUnaligned<hb_codepoint_t> (first_unicode, unicode_stride);
first_glyph = &StructAtOffsetUnaligned<hb_codepoint_t> (first_glyph, glyph_stride);
}
return done;
}
bool get_variation_glyph (hb_codepoint_t unicode,
hb_codepoint_t variation_selector,
hb_codepoint_t *glyph) const
{
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switch (this->subtable_uvs->get_glyph_variant (unicode,
variation_selector,
glyph))
{
case GLYPH_VARIANT_NOT_FOUND: return false;
case GLYPH_VARIANT_FOUND: return true;
case GLYPH_VARIANT_USE_DEFAULT: break;
}
return get_nominal_glyph (unicode, glyph);
}
void collect_unicodes (hb_set_t *out) const
{
subtable->collect_unicodes (out);
// Never include unicode codepoint 0 in the set.
// This is assumed to be the notdef glyph.
out->del (0);
}
void collect_variation_selectors (hb_set_t *out) const
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{ subtable_uvs->collect_variation_selectors (out); }
void collect_variation_unicodes (hb_codepoint_t variation_selector,
hb_set_t *out) const
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{ subtable_uvs->collect_variation_unicodes (variation_selector, out); }
protected:
typedef bool (*hb_cmap_get_glyph_func_t) (const void *obj,
hb_codepoint_t codepoint,
hb_codepoint_t *glyph);
template <typename Type>
HB_INTERNAL static bool get_glyph_from (const void *obj,
hb_codepoint_t codepoint,
hb_codepoint_t *glyph)
{
const Type *typed_obj = (const Type *) obj;
return typed_obj->get_glyph (codepoint, glyph);
}
template <typename Type>
HB_INTERNAL static bool get_glyph_from_symbol (const void *obj,
hb_codepoint_t codepoint,
hb_codepoint_t *glyph)
{
const Type *typed_obj = (const Type *) obj;
if (likely (typed_obj->get_glyph (codepoint, glyph)))
return true;
if (codepoint <= 0x00FFu)
{
/* For symbol-encoded OpenType fonts, we duplicate the
* U+F000..F0FF range at U+0000..U+00FF. That's what
* Windows seems to do, and that's hinted about at:
* https://docs.microsoft.com/en-us/typography/opentype/spec/recom
* under "Non-Standard (Symbol) Fonts". */
return typed_obj->get_glyph (0xF000u + codepoint, glyph);
}
return false;
}
private:
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hb_nonnull_ptr_t<const CmapSubtable> subtable;
hb_nonnull_ptr_t<const CmapSubtableFormat14> subtable_uvs;
hb_cmap_get_glyph_func_t get_glyph_funcZ;
const void *get_glyph_data;
CmapSubtableFormat4::accelerator_t format4_accel;
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public:
hb_blob_ptr_t<cmap> table;
};
protected:
const CmapSubtable *find_subtable (unsigned int platform_id,
unsigned int encoding_id) const
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{
EncodingRecord key;
key.platformID = platform_id;
key.encodingID = encoding_id;
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const EncodingRecord &result = encodingRecord.bsearch (key);
if (!result.subtable)
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return nullptr;
return &(this+result.subtable);
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}
const EncodingRecord *find_encodingrec (unsigned int platform_id,
unsigned int encoding_id) const
{
EncodingRecord key;
key.platformID = platform_id;
key.encodingID = encoding_id;
return encodingRecord.as_array ().bsearch (key);
}
bool find_subtable (unsigned format) const
{
auto it =
+ hb_iter (encodingRecord)
| hb_map (&EncodingRecord::subtable)
| hb_map (hb_add (this))
| hb_filter ([&] (const CmapSubtable& _) { return _.u.format == format; })
;
return it.len ();
}
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public:
bool sanitize (hb_sanitize_context_t *c) const
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{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
likely (version == 0) &&
encodingRecord.sanitize (c, this));
}
protected:
HBUINT16 version; /* Table version number (0). */
SortedArrayOf<EncodingRecord>
encodingRecord; /* Encoding tables. */
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public:
DEFINE_SIZE_ARRAY (4, encodingRecord);
};
struct cmap_accelerator_t : cmap::accelerator_t {};
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} /* namespace OT */
#endif /* HB_OT_CMAP_TABLE_HH */