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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-ot-os2-table.hh"
#include "hb-ot-shaper-arabic-pua.hh"
#include "hb-open-type.hh"
#include "hb-set.hh"
/*
* cmap -- Character to Glyph Index Mapping
* https://docs.microsoft.com/en-us/typography/opentype/spec/cmap
*/
#define HB_OT_TAG_cmap HB_TAG('c','m','a','p')
namespace OT {
struct CmapSubtableFormat0
{
bool get_glyph (hb_codepoint_t codepoint, hb_codepoint_t *glyph) const
{
hb_codepoint_t gid = codepoint < 256 ? glyphIdArray[codepoint] : 0;
if (unlikely (!gid))
return false;
*glyph = gid;
return true;
}
unsigned get_language () const
{
return language;
}
void collect_unicodes (hb_set_t *out) const
{
for (unsigned int i = 0; i < 256; i++)
if (glyphIdArray[i])
out->add (i);
}
void collect_mapping (hb_set_t *unicodes, /* OUT */
hb_map_t *mapping /* OUT */) const
{
for (unsigned i = 0; i < 256; i++)
if (glyphIdArray[i])
{
hb_codepoint_t glyph = glyphIdArray[i];
unicodes->add (i);
mapping->set (i, glyph);
}
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
}
protected:
HBUINT16 format; /* Format number is set to 0. */
HBUINT16 length; /* Byte length of this subtable. */
HBUINT16 language; /* Ignore. */
HBUINT8 glyphIdArray[256];/* An array that maps character
* code to glyph index values. */
public:
DEFINE_SIZE_STATIC (6 + 256);
};
struct CmapSubtableFormat4
{
template<typename Iterator,
typename Writer,
hb_requires (hb_is_iterator (Iterator))>
void to_ranges (Iterator it, Writer& range_writer)
{
hb_codepoint_t start_cp = 0, prev_run_start_cp = 0, run_start_cp = 0, end_cp = 0, last_gid = 0;
int run_length = 0 , delta = 0, prev_delta = 0;
enum {
FIRST_SUB_RANGE,
FOLLOWING_SUB_RANGE,
} mode;
while (it) {
// Start a new range
{
const auto& pair = *it;
start_cp = pair.first;
prev_run_start_cp = start_cp;
run_start_cp = start_cp;
end_cp = start_cp;
last_gid = pair.second;
run_length = 1;
prev_delta = 0;
}
delta = last_gid - start_cp;
mode = FIRST_SUB_RANGE;
it++;
while (it) {
// Process range
const auto& pair = *it;
hb_codepoint_t next_cp = pair.first;
hb_codepoint_t next_gid = pair.second;
if (next_cp != end_cp + 1) {
// Current range is over, stop processing.
break;
}
if (next_gid == last_gid + 1) {
// The current run continues.
end_cp = next_cp;
run_length++;
last_gid = next_gid;
it++;
continue;
}
// A new run is starting, decide if we want to commit the current run.
int split_cost = (mode == FIRST_SUB_RANGE) ? 8 : 16;
int run_cost = run_length * 2;
if (run_cost >= split_cost) {
commit_current_range(start_cp,
prev_run_start_cp,
run_start_cp,
end_cp,
delta,
prev_delta,
split_cost,
range_writer);
start_cp = next_cp;
}
// Start the new run
mode = FOLLOWING_SUB_RANGE;
prev_run_start_cp = run_start_cp;
run_start_cp = next_cp;
end_cp = next_cp;
prev_delta = delta;
delta = next_gid - run_start_cp;
run_length = 1;
last_gid = next_gid;
it++;
}
// Finalize range
commit_current_range (start_cp,
prev_run_start_cp,
run_start_cp,
end_cp,
delta,
prev_delta,
8,
range_writer);
}
if (likely (end_cp != 0xFFFF)) {
range_writer (0xFFFF, 0xFFFF, 1);
}
}
/*
* Writes the current range as either one or two ranges depending on what is most efficient.
*/
template<typename Writer>
void commit_current_range (hb_codepoint_t start,
hb_codepoint_t prev_run_start,
hb_codepoint_t run_start,
hb_codepoint_t end,
int run_delta,
int previous_run_delta,
int split_cost,
Writer& range_writer) {
bool should_split = false;
if (start < run_start && run_start < end) {
int run_cost = (end - run_start + 1) * 2;
if (run_cost >= split_cost) {
should_split = true;
}
}
// TODO(grieger): handle case where delta is legitimately 0, mark range offset array instead?
if (should_split) {
if (start == prev_run_start)
range_writer (start, run_start - 1, previous_run_delta);
else
range_writer (start, run_start - 1, 0);
range_writer (run_start, end, run_delta);
return;
}
if (start == run_start) {
// Range is only a run
range_writer (start, end, run_delta);
return;
}
// Write only a single non-run range.
range_writer (start, end, 0);
}
template<typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
unsigned serialize_find_segcount (Iterator it) {
struct Counter {
unsigned segcount = 0;
void operator() (hb_codepoint_t start,
hb_codepoint_t end,
int delta) {
segcount++;
}
} counter;
to_ranges (+it, counter);
return counter.segcount;
}
template<typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
bool serialize_start_end_delta_arrays (hb_serialize_context_t *c,
Iterator it,
int segcount)
{
struct Writer {
hb_serialize_context_t *serializer_;
HBUINT16* end_code_;
HBUINT16* start_code_;
HBINT16* id_delta_;
int index_;
Writer(hb_serialize_context_t *serializer)
: serializer_(serializer),
end_code_(nullptr),
start_code_(nullptr),
id_delta_(nullptr),
index_ (0) {}
void operator() (hb_codepoint_t start,
hb_codepoint_t end,
int delta) {
start_code_[index_] = start;
end_code_[index_] = end;
id_delta_[index_] = delta;
index_++;
}
} writer(c);
writer.end_code_ = c->allocate_size<HBUINT16> (HBUINT16::static_size * segcount);
c->allocate_size<HBUINT16> (2); // padding
writer.start_code_ = c->allocate_size<HBUINT16> (HBUINT16::static_size * segcount);
writer.id_delta_ = c->allocate_size<HBINT16> (HBINT16::static_size * segcount);
if (unlikely (!writer.end_code_ || !writer.start_code_ || !writer.id_delta_)) return false;
to_ranges (+it, writer);
return true;
}
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)
{
hb_map_t cp_to_gid { it };
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;
for (unsigned i : + hb_range (segcount)
| hb_filter ([&] (const unsigned _) { return idDelta[_] == 0; }))
{
idRangeOffset[i] = 2 * (c->start_embed<HBUINT16> () - idRangeOffset - i);
for (hb_codepoint_t cp = startCode[i]; cp <= endCode[i]; cp++)
{
HBUINT16 gid;
gid = cp_to_gid[cp];
c->copy<HBUINT16> (gid);
}
}
return idRangeOffset;
}
template<typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
void serialize (hb_serialize_context_t *c,
Iterator it)
{
auto format4_iter =
+ it
| hb_filter ([&] (const hb_pair_t<hb_codepoint_t, hb_codepoint_t> _)
{ return _.first <= 0xFFFF; })
;
if (!format4_iter) return;
unsigned table_initpos = c->length ();
if (unlikely (!c->extend_min (this))) return;
this->format = 4;
hb_vector_t<hb_pair_t<hb_codepoint_t, hb_codepoint_t>> cp_to_gid {
format4_iter
};
//serialize endCode[], startCode[], idDelta[]
HBUINT16* endCode = c->start_embed<HBUINT16> ();
unsigned segcount = serialize_find_segcount (cp_to_gid.iter());
if (unlikely (!serialize_start_end_delta_arrays (c, cp_to_gid.iter(), segcount)))
return;
HBUINT16 *startCode = endCode + segcount + 1;
HBINT16 *idDelta = ((HBINT16*)startCode) + segcount;
HBUINT16 *idRangeOffset = serialize_rangeoffset_glyid (c,
cp_to_gid.iter (),
endCode,
startCode,
idDelta,
segcount);
if (unlikely (!c->check_success (idRangeOffset))) return;
this->length = c->length () - table_initpos;
if ((long long) this->length != (long long) c->length () - table_initpos)
{
// Length overflowed. Discard the current object before setting the error condition, otherwise
// discard is a noop which prevents the higher level code from reverting the serializer to the
// pre-error state in cmap4 overflow handling code.
c->pop_discard ();
c->err (HB_SERIALIZE_ERROR_INT_OVERFLOW);
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;
}
unsigned get_language () const
{
return language;
}
struct accelerator_t
{
accelerator_t () {}
accelerator_t (const CmapSubtableFormat4 *subtable) { init (subtable); }
void init (const CmapSubtableFormat4 *subtable)
{
segCount = subtable->segCountX2 / 2;
endCount = subtable->values.arrayZ;
startCount = endCount + segCount + 1;
idDelta = startCount + segCount;
idRangeOffset = idDelta + segCount;
glyphIdArray = idRangeOffset + segCount;
glyphIdArrayLength = (subtable->length - 16 - 8 * segCount) / 2;
}
bool get_glyph (hb_codepoint_t codepoint, hb_codepoint_t *glyph) const
{
struct CustomRange
{
int cmp (hb_codepoint_t k,
unsigned distance) const
{
if (k > last) return +1;
if (k < (&last)[distance]) return -1;
return 0;
}
HBUINT16 last;
};
const HBUINT16 *found = hb_bsearch (codepoint,
this->endCount,
this->segCount,
2,
_hb_cmp_method<hb_codepoint_t, CustomRange, unsigned>,
this->segCount + 1);
if (unlikely (!found))
return false;
unsigned int i = found - endCount;
hb_codepoint_t gid;
unsigned int rangeOffset = this->idRangeOffset[i];
if (rangeOffset == 0)
gid = codepoint + this->idDelta[i];
else
{
/* Somebody has been smoking... */
unsigned int index = rangeOffset / 2 + (codepoint - this->startCount[i]) + i - this->segCount;
if (unlikely (index >= this->glyphIdArrayLength))
return false;
gid = this->glyphIdArray[index];
if (unlikely (!gid))
return false;
gid += this->idDelta[i];
}
gid &= 0xFFFFu;
if (unlikely (!gid))
return false;
*glyph = gid;
return true;
}
HB_INTERNAL static bool get_glyph_func (const void *obj, hb_codepoint_t codepoint, hb_codepoint_t *glyph)
{ return ((const accelerator_t *) obj)->get_glyph (codepoint, glyph); }
void collect_unicodes (hb_set_t *out) const
{
unsigned int count = this->segCount;
if (count && this->startCount[count - 1] == 0xFFFFu)
count--; /* Skip sentinel segment. */
for (unsigned int i = 0; i < count; i++)
{
hb_codepoint_t start = this->startCount[i];
hb_codepoint_t end = this->endCount[i];
unsigned int rangeOffset = this->idRangeOffset[i];
out->add_range(start, end);
if (rangeOffset == 0)
{
for (hb_codepoint_t codepoint = start; codepoint <= end; codepoint++)
{
hb_codepoint_t gid = (codepoint + this->idDelta[i]) & 0xFFFFu;
if (unlikely (!gid))
out->del(codepoint);
}
}
else
{
for (hb_codepoint_t codepoint = start; codepoint <= end; codepoint++)
{
unsigned int index = rangeOffset / 2 + (codepoint - this->startCount[i]) + i - this->segCount;
if (unlikely (index >= this->glyphIdArrayLength))
{
out->del_range (codepoint, end);
break;
}
hb_codepoint_t gid = this->glyphIdArray[index];
if (unlikely (!gid))
out->del(codepoint);
}
}
}
}
void collect_mapping (hb_set_t *unicodes, /* OUT */
hb_map_t *mapping /* OUT */) const
{
// TODO(grieger): optimize similar to collect_unicodes
// (ie. use add_range())
unsigned count = this->segCount;
if (count && this->startCount[count - 1] == 0xFFFFu)
count--; /* Skip sentinel segment. */
for (unsigned i = 0; i < count; i++)
{
hb_codepoint_t start = this->startCount[i];
hb_codepoint_t end = this->endCount[i];
unsigned rangeOffset = this->idRangeOffset[i];
if (rangeOffset == 0)
{
for (hb_codepoint_t codepoint = start; codepoint <= end; codepoint++)
{
hb_codepoint_t gid = (codepoint + this->idDelta[i]) & 0xFFFFu;
if (unlikely (!gid))
continue;
unicodes->add (codepoint);
mapping->set (codepoint, gid);
}
}
else
{
for (hb_codepoint_t codepoint = start; codepoint <= end; codepoint++)
{
unsigned 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;
unicodes->add (codepoint);
mapping->set (codepoint, gid);
}
}
}
}
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
{
accelerator_t accel (this);
return accel.get_glyph_func (&accel, codepoint, glyph);
}
void collect_unicodes (hb_set_t *out) const
{
accelerator_t accel (this);
accel.collect_unicodes (out);
}
void collect_mapping (hb_set_t *unicodes, /* OUT */
hb_map_t *mapping /* OUT */) const
{
accelerator_t accel (this);
accel.collect_mapping (unicodes, mapping);
}
bool sanitize (hb_sanitize_context_t *c) const
{
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);
}
protected:
HBUINT16 format; /* Format number is set to 4. */
HBUINT16 length; /* This is the length in bytes of the
* 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 */
UnsizedArrayOf<HBUINT16>
values;
#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 */
UnsizedArrayOf<HBUINT16>
glyphIdArray; /* Glyph index array (arbitrary length) */
#endif
public:
DEFINE_SIZE_ARRAY (14, values);
};
struct CmapSubtableLongGroup
{
friend struct CmapSubtableFormat12;
friend struct CmapSubtableFormat13;
template<typename U>
friend struct CmapSubtableLongSegmented;
friend struct cmap;
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
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
}
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. */
public:
DEFINE_SIZE_STATIC (12);
};
DECLARE_NULL_NAMESPACE_BYTES (OT, CmapSubtableLongGroup);
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 (unlikely (!gid))
return false;
*glyph = gid;
return true;
}
unsigned get_language () const
{
return language;
}
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])
out->add (start + i);
}
void collect_mapping (hb_set_t *unicodes, /* OUT */
hb_map_t *mapping /* OUT */) const
{
hb_codepoint_t start_cp = startCharCode;
unsigned count = glyphIdArray.len;
for (unsigned i = 0; i < count; i++)
if (glyphIdArray[i])
{
hb_codepoint_t unicode = start_cp + i;
hb_codepoint_t glyphid = glyphIdArray[i];
unicodes->add (unicode);
mapping->set (unicode, glyphid);
}
}
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<HBGlyphID16, 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
{
friend struct cmap;
bool get_glyph (hb_codepoint_t codepoint, hb_codepoint_t *glyph) const
{
hb_codepoint_t gid = T::group_get_glyph (groups.bsearch (codepoint), codepoint);
if (unlikely (!gid))
return false;
*glyph = gid;
return true;
}
unsigned get_language () const
{
return language;
}
void collect_unicodes (hb_set_t *out, unsigned int num_glyphs) const
{
for (unsigned int i = 0; i < this->groups.len; i++)
{
hb_codepoint_t start = this->groups[i].startCharCode;
hb_codepoint_t end = hb_min ((hb_codepoint_t) this->groups[i].endCharCode,
(hb_codepoint_t) HB_UNICODE_MAX);
hb_codepoint_t gid = this->groups[i].glyphID;
if (!gid)
{
/* Intention is: if (hb_is_same (T, CmapSubtableFormat13)) continue; */
if (! T::group_get_glyph (this->groups[i], end)) continue;
start++;
gid++;
}
if (unlikely ((unsigned int) gid >= num_glyphs)) continue;
if (unlikely ((unsigned int) (gid + end - start) >= num_glyphs))
end = start + (hb_codepoint_t) num_glyphs - gid;
out->add_range (start, hb_min (end, 0x10FFFFu));
}
}
void collect_mapping (hb_set_t *unicodes, /* OUT */
hb_map_t *mapping, /* OUT */
unsigned num_glyphs) const
{
hb_codepoint_t last_end = 0;
for (unsigned i = 0; i < this->groups.len; i++)
{
hb_codepoint_t start = this->groups[i].startCharCode;
hb_codepoint_t end = hb_min ((hb_codepoint_t) this->groups[i].endCharCode,
(hb_codepoint_t) HB_UNICODE_MAX);
if (unlikely (start > end || start < last_end)) {
// Range is not in order and is invalid, skip it.
continue;
}
last_end = end;
hb_codepoint_t gid = this->groups[i].glyphID;
if (!gid)
{
/* Intention is: if (hb_is_same (T, CmapSubtableFormat13)) continue; */
if (! T::group_get_glyph (this->groups[i], end)) continue;
start++;
gid++;
}
if (unlikely ((unsigned int) gid >= num_glyphs)) continue;
if (unlikely ((unsigned int) (gid + end - start) >= num_glyphs))
end = start + (hb_codepoint_t) num_glyphs - gid;
for (unsigned cp = start; cp <= end; cp++)
{
unicodes->add (cp);
mapping->set (cp, gid);
gid++;
}
}
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) && groups.sanitize (c));
}
protected:
HBUINT16 format; /* Subtable format; set to 12. */
HBUINT16 reserved; /* Reserved; set to 0. */
HBUINT32 length; /* Byte length of this subtable. */
HBUINT32 language; /* Ignore. */
SortedArray32Of<CmapSubtableLongGroup>
groups; /* Groupings. */
public:
DEFINE_SIZE_ARRAY (16, groups);
};
struct CmapSubtableFormat12 : CmapSubtableLongSegmented<CmapSubtableFormat12>
{
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) return;
unsigned table_initpos = c->length ();
if (unlikely (!c->extend_min (this))) return;
hb_codepoint_t startCharCode = (hb_codepoint_t) -1, endCharCode = (hb_codepoint_t) -1;
hb_codepoint_t glyphID = 0;
for (const auto& _ : +it)
{
if (startCharCode == (hb_codepoint_t) -1)
{
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)
{ return 16 + 12 * groups_data.length; }
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);
}
};
struct CmapSubtableFormat13 : CmapSubtableLongSegmented<CmapSubtableFormat13>
{
static hb_codepoint_t group_get_glyph (const CmapSubtableLongGroup &group,
hb_codepoint_t u HB_UNUSED)
{ return group.glyphID; }
};
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
{
if (codepoint < startUnicodeValue) return -1;
if (codepoint > startUnicodeValue + additionalCount) return +1;
return 0;
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
}
HBUINT24 startUnicodeValue; /* First value in this range. */
HBUINT8 additionalCount; /* Number of additional values in this
* range. */
public:
DEFINE_SIZE_STATIC (4);
};
struct DefaultUVS : SortedArray32Of<UnicodeValueRange>
{
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);
}
}
DefaultUVS* copy (hb_serialize_context_t *c,
const hb_set_t *unicodes) const
{
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 ();
if (this->len > unicodes->get_population () * hb_bit_storage ((unsigned) this->len))
{
hb_codepoint_t start = HB_SET_VALUE_INVALID;
hb_codepoint_t end = HB_SET_VALUE_INVALID;
for (hb_codepoint_t u = HB_SET_VALUE_INVALID;
unicodes->next (&u);)
{
if (!as_array ().bsearch (u))
continue;
if (start == HB_SET_VALUE_INVALID)
{
start = u;
end = start - 1;
}
if (end + 1 != u || end - start == 255)
{
UnicodeValueRange rec;
rec.startUnicodeValue = start;
rec.additionalCount = end - start;
c->copy<UnicodeValueRange> (rec);
start = u;
}
end = u;
}
if (start != HB_SET_VALUE_INVALID)
{
UnicodeValueRange rec;
rec.startUnicodeValue = start;
rec.additionalCount = end - start;
c->copy<UnicodeValueRange> (rec);
}
}
else
{
hb_codepoint_t lastCode = HB_SET_VALUE_INVALID;
int count = -1;
for (const UnicodeValueRange& _ : *this)
{
hb_codepoint_t curEntry = (hb_codepoint_t) (_.startUnicodeValue - 1);
hb_codepoint_t end = curEntry + _.additionalCount + 2;
for (; unicodes->next (&curEntry) && curEntry < end;)
{
count += 1;
if (lastCode == HB_SET_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;
}
}
}
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,
HB_SERIALIZE_ERROR_INT_OVERFLOW))) return nullptr;
return out;
}
}
public:
DEFINE_SIZE_ARRAY (4, *this);
};
struct UVSMapping
{
int cmp (const hb_codepoint_t &codepoint) const
{ return unicodeValue.cmp (codepoint); }
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
}
HBUINT24 unicodeValue; /* Base Unicode value of the UVS */
HBGlyphID16 glyphID; /* Glyph ID of the UVS */
public:
DEFINE_SIZE_STATIC (5);
};
struct NonDefaultUVS : SortedArray32Of<UVSMapping>
{
void collect_unicodes (hb_set_t *out) const
{
for (const auto& a : as_array ())
out->add (a.unicodeValue);
}
void collect_mapping (hb_set_t *unicodes, /* OUT */
hb_map_t *mapping /* OUT */) const
{
for (const auto& a : as_array ())
{
hb_codepoint_t unicode = a.unicodeValue;
hb_codepoint_t glyphid = a.glyphID;
unicodes->add (unicode);
mapping->set (unicode, glyphid);
}
}
void closure_glyphs (const hb_set_t *unicodes,
hb_set_t *glyphset) const
{
+ as_array ()
| hb_filter (unicodes, &UVSMapping::unicodeValue)
| hb_map (&UVSMapping::glyphID)
| hb_sink (glyphset)
;
}
NonDefaultUVS* copy (hb_serialize_context_t *c,
const hb_set_t *unicodes,
const hb_set_t *glyphs_requested,
const hb_map_t *glyph_map) const
{
NonDefaultUVS *out = c->start_embed<NonDefaultUVS> ();
if (unlikely (!out)) return nullptr;
auto it =
+ as_array ()
| hb_filter ([&] (const UVSMapping& _)
{
return unicodes->has (_.unicodeValue) || glyphs_requested->has (_.glyphID);
})
;
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);
}
return out;
}
public:
DEFINE_SIZE_ARRAY (4, *this);
};
struct VariationSelectorRecord
{
glyph_variant_t get_glyph (hb_codepoint_t codepoint,
hb_codepoint_t *glyph,
const void *base) const
{
if ((base+defaultUVS).bfind (codepoint))
return GLYPH_VARIANT_USE_DEFAULT;
const UVSMapping &nonDefault = (base+nonDefaultUVS).bsearch (codepoint);
if (nonDefault.glyphID)
{
*glyph = nonDefault.glyphID;
return GLYPH_VARIANT_FOUND;
}
return GLYPH_VARIANT_NOT_FOUND;
}
VariationSelectorRecord(const VariationSelectorRecord& other)
{
*this = other;
}
void operator= (const VariationSelectorRecord& other)
{
varSelector = other.varSelector;
HBUINT32 offset = other.defaultUVS;
defaultUVS = offset;
offset = other.nonDefaultUVS;
nonDefaultUVS = offset;
}
void collect_unicodes (hb_set_t *out, const void *base) const
{
(base+defaultUVS).collect_unicodes (out);
(base+nonDefaultUVS).collect_unicodes (out);
}
void collect_mapping (const void *base,
hb_set_t *unicodes, /* OUT */
hb_map_t *mapping /* OUT */) const
{
(base+defaultUVS).collect_unicodes (unicodes);
(base+nonDefaultUVS).collect_mapping (unicodes, mapping);
}
int cmp (const hb_codepoint_t &variation_selector) const
{ return varSelector.cmp (variation_selector); }
bool sanitize (hb_sanitize_context_t *c, const void *base) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
defaultUVS.sanitize (c, base) &&
nonDefaultUVS.sanitize (c, base));
}
hb_pair_t<unsigned, unsigned>
copy (hb_serialize_context_t *c,
const hb_set_t *unicodes,
const hb_set_t *glyphs_requested,
const hb_map_t *glyph_map,
const void *base) const
{
auto snap = c->snapshot ();
auto *out = c->embed<VariationSelectorRecord> (*this);
if (unlikely (!out)) return hb_pair (0, 0);
out->defaultUVS = 0;
out->nonDefaultUVS = 0;
unsigned non_default_uvs_objidx = 0;
if (nonDefaultUVS != 0)
{
c->push ();
if (c->copy (base+nonDefaultUVS, unicodes, glyphs_requested, glyph_map))
non_default_uvs_objidx = c->pop_pack ();
else c->pop_discard ();
}
unsigned default_uvs_objidx = 0;
if (defaultUVS != 0)
{
c->push ();
if (c->copy (base+defaultUVS, unicodes))
default_uvs_objidx = c->pop_pack ();
else c->pop_discard ();
}
if (!default_uvs_objidx && !non_default_uvs_objidx)
c->revert (snap);
return hb_pair (default_uvs_objidx, non_default_uvs_objidx);
}
HBUINT24 varSelector; /* Variation selector. */
Offset32To<DefaultUVS>
defaultUVS; /* Offset to Default UVS Table. May be 0. */
Offset32To<NonDefaultUVS>
nonDefaultUVS; /* Offset to Non-Default UVS Table. May be 0. */
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
{ return record.bsearch (variation_selector).get_glyph (codepoint, glyph, this); }
void collect_variation_selectors (hb_set_t *out) const
{
for (const auto& a : record.as_array ())
out->add (a.varSelector);
}
void collect_variation_unicodes (hb_codepoint_t variation_selector,
hb_set_t *out) const
{ record.bsearch (variation_selector).collect_unicodes (out, this); }
void serialize (hb_serialize_context_t *c,
const hb_set_t *unicodes,
const hb_set_t *glyphs_requested,
const hb_map_t *glyph_map,
const void *base)
{
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;
auto src_tbl = reinterpret_cast<const CmapSubtableFormat14*> (base);
/*
* Some versions of OTS require that offsets are in order. Due to the use
* of push()/pop_pack() serializing the variation records in order results
* in the offsets being in reverse order (first record has the largest
* offset). While this is perfectly valid, it will cause some versions of
* OTS to consider this table bad.
*
* So to prevent this issue we serialize the variation records in reverse
* order, so that the offsets are ordered from small to large. Since
* variation records are supposed to be in increasing order of varSelector
* we then have to reverse the order of the written variation selector
* records after everything is finalized.
*/
hb_vector_t<hb_pair_t<unsigned, unsigned>> obj_indices;
for (int i = src_tbl->record.len - 1; i >= 0; i--)
{
hb_pair_t<unsigned, unsigned> result = src_tbl->record[i].copy (c, unicodes, glyphs_requested, glyph_map, base);
if (result.first || result.second)
obj_indices.push (result);
}
if (c->length () - table_initpos == CmapSubtableFormat14::min_size)
{
c->revert (snap);
return;
}
if (unlikely (!c->check_success (!obj_indices.in_error ())))
return;
int tail_len = init_tail - c->tail;
c->check_assign (this->length, c->length () - table_initpos + tail_len,
HB_SERIALIZE_ERROR_INT_OVERFLOW);
c->check_assign (this->record.len,
(c->length () - table_initpos - CmapSubtableFormat14::min_size) /
VariationSelectorRecord::static_size,
HB_SERIALIZE_ERROR_INT_OVERFLOW);
/* Correct the incorrect write order by reversing the order of the variation
records array. */
_reverse_variation_records ();
/* Now that records are in the right order, we can set up the offsets. */
_add_links_to_variation_records (c, obj_indices);
}
void _reverse_variation_records ()
{
record.as_array ().reverse ();
}
void _add_links_to_variation_records (hb_serialize_context_t *c,
const hb_vector_t<hb_pair_t<unsigned, unsigned>>& obj_indices)
{
for (unsigned i = 0; i < obj_indices.length; i++)
{
/*
* Since the record array has been reversed (see comments in copy())
* but obj_indices has not been, the indices at obj_indices[i]
* are for the variation record at record[j].
*/
int j = obj_indices.length - 1 - i;
c->add_link (record[j].defaultUVS, obj_indices[i].first);
c->add_link (record[j].nonDefaultUVS, obj_indices[i].second);
}
}
void closure_glyphs (const hb_set_t *unicodes,
hb_set_t *glyphset) const
{
+ hb_iter (record)
| hb_filter (hb_bool, &VariationSelectorRecord::nonDefaultUVS)
| hb_map (&VariationSelectorRecord::nonDefaultUVS)
| hb_map (hb_add (this))
| hb_apply ([=] (const NonDefaultUVS& _) { _.closure_glyphs (unicodes, glyphset); })
;
}
void collect_unicodes (hb_set_t *out) const
{
for (const VariationSelectorRecord& _ : record)
_.collect_unicodes (out, this);
}
void collect_mapping (hb_set_t *unicodes, /* OUT */
hb_map_t *mapping /* OUT */) const
{
for (const VariationSelectorRecord& _ : record)
_.collect_mapping (this, unicodes, mapping);
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
record.sanitize (c, this));
}
protected:
HBUINT16 format; /* Format number is set to 14. */
HBUINT32 length; /* Byte length of this subtable. */
SortedArray32Of<VariationSelectorRecord>
record; /* Variation selector records; sorted
* in increasing order of `varSelector'. */
public:
DEFINE_SIZE_ARRAY (10, record);
};
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
{
switch (u.format) {
case 0: return u.format0 .get_glyph (codepoint, glyph);
case 4: return u.format4 .get_glyph (codepoint, glyph);
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);
case 14:
default: return false;
}
}
void collect_unicodes (hb_set_t *out, unsigned int num_glyphs = UINT_MAX) 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, num_glyphs); return;
case 13: u.format13.collect_unicodes (out, num_glyphs); return;
case 14:
default: return;
}
}
void collect_mapping (hb_set_t *unicodes, /* OUT */
hb_map_t *mapping, /* OUT */
unsigned num_glyphs = UINT_MAX) const
{
switch (u.format) {
case 0: u.format0 .collect_mapping (unicodes, mapping); return;
case 4: u.format4 .collect_mapping (unicodes, mapping); return;
case 6: u.format6 .collect_mapping (unicodes, mapping); return;
case 10: u.format10.collect_mapping (unicodes, mapping); return;
case 12: u.format12.collect_mapping (unicodes, mapping, num_glyphs); return;
case 13: u.format13.collect_mapping (unicodes, mapping, num_glyphs); return;
case 14:
default: return;
}
}
unsigned get_language () const
{
switch (u.format) {
case 0: return u.format0 .get_language ();
case 4: return u.format4 .get_language ();
case 6: return u.format6 .get_language ();
case 10: return u.format10.get_language ();
case 12: return u.format12.get_language ();
case 13: return u.format13.get_language ();
case 14:
default: return 0;
}
}
template<typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
void serialize (hb_serialize_context_t *c,
Iterator it,
unsigned format,
const hb_subset_plan_t *plan,
const void *base)
{
switch (format) {
case 4: return u.format4.serialize (c, it);
case 12: return u.format12.serialize (c, it);
case 14: return u.format14.serialize (c, plan->unicodes, plan->glyphs_requested, plan->glyph_map, base);
default: return;
}
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
if (!u.format.sanitize (c)) return_trace (false);
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);
}
}
public:
union {
HBUINT16 format; /* Format identifier */
CmapSubtableFormat0 format0;
CmapSubtableFormat4 format4;
CmapSubtableFormat6 format6;
CmapSubtableFormat10 format10;
CmapSubtableFormat12 format12;
CmapSubtableFormat13 format13;
CmapSubtableFormat14 format14;
} u;
public:
DEFINE_SIZE_UNION (2, format);
};
struct EncodingRecord
{
int cmp (const EncodingRecord &other) const
{
int ret;
ret = platformID.cmp (other.platformID);
if (ret) return ret;
ret = encodingID.cmp (other.encodingID);
if (ret) return ret;
return 0;
}
bool sanitize (hb_sanitize_context_t *c, const void *base) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
subtable.sanitize (c, base));
}
template<typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
EncodingRecord* copy (hb_serialize_context_t *c,
Iterator it,
unsigned format,
const void *base,
const hb_subset_plan_t *plan,
/* INOUT */ unsigned *objidx) const
{
TRACE_SERIALIZE (this);
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, &(base+subtable));
if (c->length () - origin_length > 0) *objidx = c->pop_pack ();
else c->pop_discard ();
}
if (*objidx == 0)
{
c->revert (snap);
return_trace (nullptr);
}
c->add_link (out->subtable, *objidx);
return_trace (out);
}
HBUINT16 platformID; /* Platform ID. */
HBUINT16 encodingID; /* Platform-specific encoding ID. */
Offset32To<CmapSubtable>
subtable; /* Byte offset from beginning of table to the subtable for this encoding. */
public:
DEFINE_SIZE_STATIC (8);
};
struct cmap;
struct SubtableUnicodesCache {
private:
hb_blob_ptr_t<cmap> base_blob;
const char* base;
hb_hashmap_t<unsigned, hb::unique_ptr<hb_set_t>> cached_unicodes;
public:
static SubtableUnicodesCache* create (hb_blob_ptr_t<cmap> source_table)
{
SubtableUnicodesCache* cache =
(SubtableUnicodesCache*) hb_malloc (sizeof(SubtableUnicodesCache));
new (cache) SubtableUnicodesCache (source_table);
return cache;
}
static void destroy (void* value) {
if (!value) return;
SubtableUnicodesCache* cache = (SubtableUnicodesCache*) value;
cache->~SubtableUnicodesCache ();
hb_free (cache);
}
SubtableUnicodesCache(const void* cmap_base)
: base_blob(),
base ((const char*) cmap_base),
cached_unicodes ()
{}
SubtableUnicodesCache(hb_blob_ptr_t<cmap> base_blob_)
: base_blob(base_blob_),
base ((const char *) base_blob.get()),
cached_unicodes ()
{}
~SubtableUnicodesCache()
{
base_blob.destroy ();
}
bool same_base(const void* other) const
{
return other == (const void*) base;
}
const hb_set_t* set_for (const EncodingRecord* record,
SubtableUnicodesCache& mutable_cache) const
{
if (cached_unicodes.has ((unsigned) ((const char *) record - base)))
return cached_unicodes.get ((unsigned) ((const char *) record - base));
return mutable_cache.set_for (record);
}
const hb_set_t* set_for (const EncodingRecord* record)
{
if (!cached_unicodes.has ((unsigned) ((const char *) record - base)))
{
hb_set_t *s = hb_set_create ();
if (unlikely (s->in_error ()))
return hb_set_get_empty ();
(base+record->subtable).collect_unicodes (s);
if (unlikely (!cached_unicodes.set ((unsigned) ((const char *) record - base), hb::unique_ptr<hb_set_t> {s})))
return hb_set_get_empty ();
return s;
}
return cached_unicodes.get ((unsigned) ((const char *) record - base));
}
};
static inline uint_fast16_t
_hb_symbol_pua_map (unsigned codepoint)
{
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 0xF000u + codepoint;
}
return 0;
}
struct cmap
{
static constexpr hb_tag_t tableTag = HB_OT_TAG_cmap;
static SubtableUnicodesCache* create_filled_cache(hb_blob_ptr_t<cmap> source_table) {
const cmap* cmap = source_table.get();
auto it =
+ hb_iter (cmap->encodingRecord)
| hb_filter ([&](const EncodingRecord& _) {
return cmap::filter_encoding_records_for_subset (cmap, _);
})
;
SubtableUnicodesCache* cache = SubtableUnicodesCache::create(source_table);
for (const EncodingRecord& _ : it)
cache->set_for(&_); // populate the cache for this encoding record.
return cache;
}
template<typename Iterator, typename EncodingRecIter,
hb_requires (hb_is_iterator (EncodingRecIter))>
bool serialize (hb_serialize_context_t *c,
Iterator it,
EncodingRecIter encodingrec_iter,
const void *base,
hb_subset_plan_t *plan,
bool drop_format_4 = false)
{
if (unlikely (!c->extend_min ((*this)))) return false;
this->version = 0;
unsigned format4objidx = 0, format12objidx = 0, format14objidx = 0;
auto snap = c->snapshot ();
SubtableUnicodesCache local_unicodes_cache (base);
const SubtableUnicodesCache* unicodes_cache = &local_unicodes_cache;
if (plan->accelerator &&
plan->accelerator->cmap_cache &&
plan->accelerator->cmap_cache->same_base (base))
unicodes_cache = plan->accelerator->cmap_cache;
for (const EncodingRecord& _ : encodingrec_iter)
{
if (c->in_error ())
return false;
unsigned format = (base+_.subtable).u.format;
if (format != 4 && format != 12 && format != 14) continue;
const hb_set_t* unicodes_set = unicodes_cache->set_for (&_, local_unicodes_cache);
if (!drop_format_4 && format == 4)
{
c->copy (_, + it | hb_filter (*unicodes_set, hb_first), 4u, base, plan, &format4objidx);
if (c->in_error () && c->only_overflow ())
{
// cmap4 overflowed, reset and retry serialization without format 4 subtables.
c->revert (snap);
return serialize (c, it,
encodingrec_iter,
base,
plan,
true);
}
}
else if (format == 12)
{
if (_can_drop (_,
*unicodes_set,
base,
*unicodes_cache,
local_unicodes_cache,
+ it | hb_map (hb_first), encodingrec_iter))
continue;
c->copy (_, + it | hb_filter (*unicodes_set, hb_first), 12u, base, plan, &format12objidx);
}
else if (format == 14) c->copy (_, it, 14u, base, plan, &format14objidx);
}
c->check_assign(this->encodingRecord.len,
(c->length () - cmap::min_size)/EncodingRecord::static_size,
HB_SERIALIZE_ERROR_INT_OVERFLOW);
// Fail if format 4 was dropped and there is no cmap12.
return !drop_format_4 || format12objidx;
}
template<typename Iterator, typename EncodingRecordIterator,
hb_requires (hb_is_iterator (Iterator)),
hb_requires (hb_is_iterator (EncodingRecordIterator))>
bool _can_drop (const EncodingRecord& cmap12,
const hb_set_t& cmap12_unicodes,
const void* base,
const SubtableUnicodesCache& unicodes_cache,
SubtableUnicodesCache& local_unicodes_cache,
Iterator subset_unicodes,
EncodingRecordIterator encoding_records)
{
for (auto cp : + subset_unicodes | hb_filter (cmap12_unicodes))
{
if (cp >= 0x10000) return false;
}
unsigned target_platform;
unsigned target_encoding;
unsigned target_language = (base+cmap12.subtable).get_language ();
if (cmap12.platformID == 0 && cmap12.encodingID == 4)
{
target_platform = 0;
target_encoding = 3;
} else if (cmap12.platformID == 3 && cmap12.encodingID == 10) {
target_platform = 3;
target_encoding = 1;
} else {
return false;
}
for (const auto& _ : encoding_records)
{
if (_.platformID != target_platform
|| _.encodingID != target_encoding
|| (base+_.subtable).get_language() != target_language)
continue;
const hb_set_t* sibling_unicodes = unicodes_cache.set_for (&_, local_unicodes_cache);
auto cmap12 = + subset_unicodes | hb_filter (cmap12_unicodes);
auto sibling = + subset_unicodes | hb_filter (*sibling_unicodes);
for (; cmap12 && sibling; cmap12++, sibling++)
{
unsigned a = *cmap12;
unsigned b = *sibling;
if (a != b) return false;
}
return !cmap12 && !sibling;
}
return false;
}
void closure_glyphs (const hb_set_t *unicodes,
hb_set_t *glyphset) const
{
+ 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
{
TRACE_SUBSET (this);
cmap *cmap_prime = c->serializer->start_embed<cmap> ();
if (unlikely (!c->serializer->check_success (cmap_prime))) return_trace (false);
auto encodingrec_iter =
+ hb_iter (encodingRecord)
| hb_filter ([&](const EncodingRecord& _) {
return cmap::filter_encoding_records_for_subset (this, _);
})
;
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;
for (const EncodingRecord& _ : encodingrec_iter)
{
unsigned format = (this + _.subtable).u.format;
if (format == 12) has_format12 = true;
const EncodingRecord *table = std::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;
}
if (unlikely (!has_format12 && !unicode_bmp && !ms_bmp)) return_trace (false);
if (unlikely (has_format12 && (!unicode_ucs4 && !ms_ucs4))) return_trace (false);
auto it =
+ c->plan->unicode_to_new_gid_list.iter ()
| hb_filter ([&] (const hb_pair_t<hb_codepoint_t, hb_codepoint_t> _)
{ return (_.second != HB_MAP_VALUE_INVALID); })
;
return_trace (cmap_prime->serialize (c->serializer,
it,
encodingrec_iter,
this,
c->plan));
}
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;
}
/* 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. */
return &Null (CmapSubtable);
}
struct accelerator_t
{
accelerator_t (hb_face_t *face)
{
this->table = hb_sanitize_context_t ().reference_table<cmap> (face);
bool symbol;
this->subtable = table->find_best_subtable (&symbol);
this->subtable_uvs = &Null (CmapSubtableFormat14);
{
const CmapSubtable *st = table->find_subtable (0, 5);
if (st && st->u.format == 14)
subtable_uvs = &st->u.format14;
}
this->get_glyph_data = subtable;
if (unlikely (symbol))
{
switch ((unsigned) face->table.OS2->get_font_page ()) {
case OS2::font_page_t::FONT_PAGE_NONE:
this->get_glyph_funcZ = get_glyph_from_symbol<CmapSubtable, _hb_symbol_pua_map>;
break;
#ifndef HB_NO_OT_SHAPER_ARABIC_FALLBACK
case OS2::font_page_t::FONT_PAGE_SIMP_ARABIC:
this->get_glyph_funcZ = get_glyph_from_symbol<CmapSubtable, _hb_arabic_pua_simp_map>;
break;
case OS2::font_page_t::FONT_PAGE_TRAD_ARABIC:
this->get_glyph_funcZ = get_glyph_from_symbol<CmapSubtable, _hb_arabic_pua_trad_map>;
break;
#endif
default:
this->get_glyph_funcZ = get_glyph_from<CmapSubtable>;
break;
}
}
else
{
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:
{
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;
}
}
}
}
~accelerator_t () { this->table.destroy (); }
bool get_nominal_glyph (hb_codepoint_t unicode,
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++)
{
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
{
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, unsigned int num_glyphs) const
{ subtable->collect_unicodes (out, num_glyphs); }
void collect_mapping (hb_set_t *unicodes, hb_map_t *mapping,
unsigned num_glyphs = UINT_MAX) const
{ subtable->collect_mapping (unicodes, mapping, num_glyphs); }
void collect_variation_selectors (hb_set_t *out) const
{ subtable_uvs->collect_variation_selectors (out); }
void collect_variation_unicodes (hb_codepoint_t variation_selector,
hb_set_t *out) const
{ 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);
typedef uint_fast16_t (*hb_pua_remap_func_t) (unsigned);
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_pua_remap_func_t remap>
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 (hb_codepoint_t c = remap (codepoint))
return typed_obj->get_glyph (c, glyph);
return false;
}
private:
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;
public:
hb_blob_ptr_t<cmap> table;
};
protected:
const CmapSubtable *find_subtable (unsigned int platform_id,
unsigned int encoding_id) const
{
EncodingRecord key;
key.platformID = platform_id;
key.encodingID = encoding_id;
const EncodingRecord &result = encodingRecord.bsearch (key);
if (!result.subtable)
return nullptr;
return &(this+result.subtable);
}
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 ();
}
public:
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
likely (version == 0) &&
encodingRecord.sanitize (c, this));
}
private:
static bool filter_encoding_records_for_subset(const cmap* cmap,
const EncodingRecord& _)
{
return
(_.platformID == 0 && _.encodingID == 3) ||
(_.platformID == 0 && _.encodingID == 4) ||
(_.platformID == 3 && _.encodingID == 1) ||
(_.platformID == 3 && _.encodingID == 10) ||
(cmap + _.subtable).u.format == 14;
}
protected:
HBUINT16 version; /* Table version number (0). */
SortedArray16Of<EncodingRecord>
encodingRecord; /* Encoding tables. */
public:
DEFINE_SIZE_ARRAY (4, encodingRecord);
};
struct cmap_accelerator_t : cmap::accelerator_t {
cmap_accelerator_t (hb_face_t *face) : cmap::accelerator_t (face) {}
};
} /* namespace OT */
#endif /* HB_OT_CMAP_TABLE_HH */
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