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Diffstat (limited to 'gfx/harfbuzz/src/hb-ot-cmap-table.hh')
| -rw-r--r-- | gfx/harfbuzz/src/hb-ot-cmap-table.hh | 2099 |
1 files changed, 2099 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-ot-cmap-table.hh b/gfx/harfbuzz/src/hb-ot-cmap-table.hh new file mode 100644 index 0000000000..e2e2581855 --- /dev/null +++ b/gfx/harfbuzz/src/hb-ot-cmap-table.hh @@ -0,0 +1,2099 @@ +/* + * 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" +#include "hb-cache.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, false); + (void) c->allocate_size<HBUINT16> (2); // padding + writer.start_code_ = c->allocate_size<HBUINT16> (HBUINT16::static_size * segcount, false); + writer.id_delta_ = c->allocate_size<HBINT16> (HBINT16::static_size * segcount, false); + + 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_codepoint_pair_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_codepoint_pair_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]/*first*/) return -1; + return 0; + } + HBUINT16 last; + }; + + const HBUINT16 *found = hb_bsearch (codepoint, + this->endCount, + this->segCount, + sizeof (CustomRange), + _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); + hb_barrier (); + + 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; + unsigned count = this->groups.len; + for (unsigned i = 0; i < count; i++) + { + hb_codepoint_t start = this->groups.arrayZ[i].startCharCode; + hb_codepoint_t end = hb_min ((hb_codepoint_t) this->groups.arrayZ[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.arrayZ[i].glyphID; + if (!gid) + { + if (T::formatNumber == 13) 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; + + mapping->alloc (mapping->get_population () + end - start + 1); + + unicodes->add_range (start, end); + for (unsigned cp = start; cp <= end; cp++) + { + mapping->set (cp, gid); + gid += T::increment; + } + } + } + + 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 constexpr int increment = 1; + static constexpr int formatNumber = 12; + + 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 constexpr int increment = 0; + static constexpr int formatNumber = 13; + + 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 + { + auto *out = c->start_embed<DefaultUVS> (); + 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 (auto u : *unicodes) + { + 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 + { + auto *out = c->start_embed<NonDefaultUVS> (); + 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); + hb_barrier (); + 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> (); + + 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_codepoint_pair_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 + { + using cache_t = hb_cache_t<21, 16, 8, true>; + + 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 (); } + + inline bool _cached_get (hb_codepoint_t unicode, + hb_codepoint_t *glyph, + cache_t *cache) const + { + unsigned v; + if (cache && cache->get (unicode, &v)) + { + *glyph = v; + return true; + } + bool ret = this->get_glyph_funcZ (this->get_glyph_data, unicode, glyph); + + if (cache && ret) + cache->set (unicode, *glyph); + return ret; + } + + bool get_nominal_glyph (hb_codepoint_t unicode, + hb_codepoint_t *glyph, + cache_t *cache = nullptr) const + { + if (unlikely (!this->get_glyph_funcZ)) return 0; + return _cached_get (unicode, glyph, cache); + } + + 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, + cache_t *cache = nullptr) const + { + if (unlikely (!this->get_glyph_funcZ)) return 0; + + unsigned int done; + for (done = 0; + done < count && _cached_get (*first_unicode, first_glyph, cache); + 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, + cache_t *cache = nullptr) 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, cache); + } + + 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) && + hb_barrier () && + 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 */ |