summaryrefslogtreecommitdiffstats
path: root/gfx/harfbuzz/src/hb-ot-cmap-table.hh
diff options
context:
space:
mode:
Diffstat (limited to 'gfx/harfbuzz/src/hb-ot-cmap-table.hh')
-rw-r--r--gfx/harfbuzz/src/hb-ot-cmap-table.hh2099
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 */