/* * Copyright © 2014 Google, Inc. * * This is part of HarfBuzz, a text shaping library. * * Permission is hereby granted, without written agreement and without * license or royalty fees, to use, copy, modify, and distribute this * software and its documentation for any purpose, provided that the * above copyright notice and the following two paragraphs appear in * all copies of this software. * * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. * * Google Author(s): Behdad Esfahbod */ #ifndef HB_OT_CMAP_TABLE_HH #define HB_OT_CMAP_TABLE_HH #include "hb-open-type-private.hh" #include "hb-set-private.hh" #include "hb-subset-plan.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') #ifndef HB_MAX_UNICODE_CODEPOINT_VALUE #define HB_MAX_UNICODE_CODEPOINT_VALUE 0x10FFFF #endif namespace OT { struct CmapSubtableFormat0 { inline bool get_glyph (hb_codepoint_t codepoint, hb_codepoint_t *glyph) const { hb_codepoint_t gid = codepoint < 256 ? glyphIdArray[codepoint] : 0; if (!gid) return false; *glyph = gid; return true; } inline 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 { struct segment_plan { HBUINT16 start_code; HBUINT16 end_code; bool use_delta; }; bool serialize (hb_serialize_context_t *c, const hb_subset_plan_t *plan, const hb_vector_t &segments) { TRACE_SERIALIZE (this); if (unlikely (!c->extend_min (*this))) return_trace (false); this->format.set (4); this->length.set (get_sub_table_size (segments)); this->segCountX2.set (segments.len * 2); this->entrySelector.set (MAX (1u, hb_bit_storage (segments.len)) - 1); this->searchRange.set (2 * (1u << this->entrySelector)); this->rangeShift.set (segments.len * 2 > this->searchRange ? 2 * segments.len - this->searchRange : 0); HBUINT16 *end_count = c->allocate_size (HBUINT16::static_size * segments.len); c->allocate_size (HBUINT16::static_size); // 2 bytes of padding. HBUINT16 *start_count = c->allocate_size (HBUINT16::static_size * segments.len); HBINT16 *id_delta = c->allocate_size (HBUINT16::static_size * segments.len); HBUINT16 *id_range_offset = c->allocate_size (HBUINT16::static_size * segments.len); if (id_range_offset == nullptr) return_trace (false); for (unsigned int i = 0; i < segments.len; i++) { end_count[i].set (segments[i].end_code); start_count[i].set (segments[i].start_code); if (segments[i].use_delta) { hb_codepoint_t cp = segments[i].start_code; hb_codepoint_t start_gid = 0; if (unlikely (!plan->new_gid_for_codepoint (cp, &start_gid) && cp != 0xFFFF)) return_trace (false); id_delta[i].set (start_gid - segments[i].start_code); } else { id_delta[i].set (0); unsigned int num_codepoints = segments[i].end_code - segments[i].start_code + 1; HBUINT16 *glyph_id_array = c->allocate_size (HBUINT16::static_size * num_codepoints); if (glyph_id_array == nullptr) return_trace (false); // From the cmap spec: // // id_range_offset[i]/2 // + (cp - segments[i].start_code) // + (id_range_offset + i) // = // glyph_id_array + (cp - segments[i].start_code) // // So, solve for id_range_offset[i]: // // id_range_offset[i] // = // 2 * (glyph_id_array - id_range_offset - i) id_range_offset[i].set (2 * ( glyph_id_array - id_range_offset - i)); for (unsigned int j = 0; j < num_codepoints; j++) { hb_codepoint_t cp = segments[i].start_code + j; hb_codepoint_t new_gid; if (unlikely (!plan->new_gid_for_codepoint (cp, &new_gid))) return_trace (false); glyph_id_array[j].set (new_gid); } } } return_trace (true); } static inline size_t get_sub_table_size (const hb_vector_t &segments) { size_t segment_size = 0; for (unsigned int i = 0; i < segments.len; i++) { // Parallel array entries segment_size += 2 // end count + 2 // start count + 2 // delta + 2; // range offset if (!segments[i].use_delta) // Add bytes for the glyph index array entries for this segment. segment_size += (segments[i].end_code - segments[i].start_code + 1) * 2; } return min_size + 2 // Padding + segment_size; } static inline bool create_sub_table_plan (const hb_subset_plan_t *plan, hb_vector_t *segments) { segment_plan *segment = nullptr; hb_codepoint_t last_gid = 0; hb_codepoint_t cp = HB_SET_VALUE_INVALID; while (plan->unicodes->next (&cp)) { hb_codepoint_t new_gid; if (unlikely (!plan->new_gid_for_codepoint (cp, &new_gid))) { DEBUG_MSG(SUBSET, nullptr, "Unable to find new gid for %04x", cp); return false; } if (cp > 0xFFFF) { // We are now outside of unicode BMP, stop adding to this cmap. break; } if (!segment || cp != segment->end_code + 1u) { segment = segments->push (); segment->start_code.set (cp); segment->end_code.set (cp); segment->use_delta = true; } else { segment->end_code.set (cp); if (last_gid + 1u != new_gid) // gid's are not consecutive in this segment so delta // cannot be used. segment->use_delta = false; } last_gid = new_gid; } // There must be a final entry with end_code == 0xFFFF. Check if we need to add one. if (segment == nullptr || segment->end_code != 0xFFFF) { segment = segments->push (); segment->start_code.set (0xFFFF); segment->end_code.set (0xFFFF); segment->use_delta = true; } return true; } struct accelerator_t { inline void init (const CmapSubtableFormat4 *subtable) { segCount = subtable->segCountX2 / 2; endCount = subtable->values; startCount = endCount + segCount + 1; idDelta = startCount + segCount; idRangeOffset = idDelta + segCount; glyphIdArray = idRangeOffset + segCount; glyphIdArrayLength = (subtable->length - 16 - 8 * segCount) / 2; } static inline bool get_glyph_func (const void *obj, hb_codepoint_t codepoint, hb_codepoint_t *glyph) { const accelerator_t *thiz = (const accelerator_t *) obj; /* Custom two-array bsearch. */ int min = 0, max = (int) thiz->segCount - 1; const HBUINT16 *startCount = thiz->startCount; const HBUINT16 *endCount = thiz->endCount; unsigned int i; while (min <= max) { int mid = (min + max) / 2; if (codepoint < startCount[mid]) max = mid - 1; else if (codepoint > endCount[mid]) min = mid + 1; else { i = mid; goto found; } } return false; found: hb_codepoint_t gid; unsigned int rangeOffset = thiz->idRangeOffset[i]; if (rangeOffset == 0) gid = codepoint + thiz->idDelta[i]; else { /* Somebody has been smoking... */ unsigned int index = rangeOffset / 2 + (codepoint - thiz->startCount[i]) + i - thiz->segCount; if (unlikely (index >= thiz->glyphIdArrayLength)) return false; gid = thiz->glyphIdArray[index]; if (unlikely (!gid)) return false; gid += thiz->idDelta[i]; } *glyph = gid & 0xFFFFu; return true; } static inline void get_all_codepoints_func (const void *obj, hb_set_t *out) { const accelerator_t *thiz = (const accelerator_t *) obj; for (unsigned int i = 0; i < thiz->segCount; i++) { if (thiz->startCount[i] != 0xFFFFu || thiz->endCount[i] != 0xFFFFu) // Skip the last segment (0xFFFF) hb_set_add_range (out, thiz->startCount[i], thiz->endCount[i]); } } const HBUINT16 *endCount; const HBUINT16 *startCount; const HBUINT16 *idDelta; const HBUINT16 *idRangeOffset; const HBUINT16 *glyphIdArray; unsigned int segCount; unsigned int glyphIdArrayLength; }; inline bool get_glyph (hb_codepoint_t codepoint, hb_codepoint_t *glyph) const { accelerator_t accel; accel.init (this); return accel.get_glyph_func (&accel, codepoint, glyph); } inline bool sanitize (hb_sanitize_context_t *c) const { TRACE_SANITIZE (this); if (unlikely (!c->check_struct (this))) return_trace (false); if (unlikely (!c->check_range (this, length))) { /* Some broken fonts have too long of a "length" value. * If that is the case, just change the value to truncate * the subtable at the end of the blob. */ uint16_t new_length = (uint16_t) 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 */ HBUINT16 values[VAR]; #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 */ HBUINT16 glyphIdArray[VAR]; /* Glyph index array (arbitrary length) */ #endif public: DEFINE_SIZE_ARRAY (14, values); }; struct CmapSubtableLongGroup { friend struct CmapSubtableFormat12; friend struct CmapSubtableFormat13; template 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; } inline 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); }; template struct CmapSubtableTrimmed { inline bool get_glyph (hb_codepoint_t codepoint, hb_codepoint_t *glyph) const { /* Rely on our implicit array bound-checking. */ hb_codepoint_t gid = glyphIdArray[codepoint - startCharCode]; if (!gid) return false; *glyph = gid; return true; } inline 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 glyphIdArray; /* Array of glyph index values for character * codes in the range. */ public: DEFINE_SIZE_ARRAY (5 * sizeof (UINT), glyphIdArray); }; struct CmapSubtableFormat6 : CmapSubtableTrimmed {}; struct CmapSubtableFormat10 : CmapSubtableTrimmed {}; template struct CmapSubtableLongSegmented { friend struct cmap; inline bool get_glyph (hb_codepoint_t codepoint, hb_codepoint_t *glyph) const { int i = groups.bsearch (codepoint); if (i == -1) return false; *glyph = T::group_get_glyph (groups[i], codepoint); return true; } inline void get_all_codepoints (hb_set_t *out) const { for (unsigned int i = 0; i < this->groups.len; i++) { hb_set_add_range (out, MIN ((unsigned int) this->groups[i].startCharCode, (unsigned int) HB_MAX_UNICODE_CODEPOINT_VALUE), MIN ((unsigned int) this->groups[i].endCharCode, (unsigned int) HB_MAX_UNICODE_CODEPOINT_VALUE)); } } inline bool sanitize (hb_sanitize_context_t *c) const { TRACE_SANITIZE (this); return_trace (c->check_struct (this) && groups.sanitize (c)); } inline bool serialize (hb_serialize_context_t *c, const hb_vector_t &group_data) { TRACE_SERIALIZE (this); if (unlikely (!c->extend_min (*this))) return_trace (false); Supplier supplier (group_data.arrayZ, group_data.len); if (unlikely (!groups.serialize (c, supplier, group_data.len))) return_trace (false); return true; } protected: HBUINT16 format; /* Subtable format; set to 12. */ HBUINT16 reserved; /* Reserved; set to 0. */ HBUINT32 length; /* Byte length of this subtable. */ HBUINT32 language; /* Ignore. */ SortedArrayOf groups; /* Groupings. */ public: DEFINE_SIZE_ARRAY (16, groups); }; struct CmapSubtableFormat12 : CmapSubtableLongSegmented { static inline hb_codepoint_t group_get_glyph (const CmapSubtableLongGroup &group, hb_codepoint_t u) { return group.glyphID + (u - group.startCharCode); } bool serialize (hb_serialize_context_t *c, const hb_vector_t &groups) { if (unlikely (!c->extend_min (*this))) return false; this->format.set (12); this->reserved.set (0); this->length.set (get_sub_table_size (groups)); return CmapSubtableLongSegmented::serialize (c, groups); } static inline size_t get_sub_table_size (const hb_vector_t &groups) { return 16 + 12 * groups.len; } static inline bool create_sub_table_plan (const hb_subset_plan_t *plan, hb_vector_t *groups) { CmapSubtableLongGroup *group = nullptr; hb_codepoint_t cp = HB_SET_VALUE_INVALID; while (plan->unicodes->next (&cp)) { hb_codepoint_t new_gid; if (unlikely (!plan->new_gid_for_codepoint (cp, &new_gid))) { DEBUG_MSG(SUBSET, nullptr, "Unable to find new gid for %04x", cp); return false; } if (!group || !_is_gid_consecutive (group, cp, new_gid)) { group = groups->push (); group->startCharCode.set (cp); group->endCharCode.set (cp); group->glyphID.set (new_gid); } else { group->endCharCode.set (cp); } } DEBUG_MSG(SUBSET, nullptr, "cmap"); for (unsigned int i = 0; i < groups->len; i++) { CmapSubtableLongGroup& group = (*groups)[i]; DEBUG_MSG(SUBSET, nullptr, " %d: U+%04X-U+%04X, gid %d-%d", i, (uint32_t) group.startCharCode, (uint32_t) group.endCharCode, (uint32_t) group.glyphID, (uint32_t) group.glyphID + ((uint32_t) group.endCharCode - (uint32_t) group.startCharCode)); } return true; } private: static inline bool _is_gid_consecutive (CmapSubtableLongGroup *group, hb_codepoint_t cp, hb_codepoint_t new_gid) { return (cp - 1 == group->endCharCode) && new_gid == group->glyphID + (cp - group->startCharCode); } }; struct CmapSubtableFormat13 : CmapSubtableLongSegmented { static inline 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 { inline int cmp (const hb_codepoint_t &codepoint) const { if (codepoint < startUnicodeValue) return -1; if (codepoint > startUnicodeValue + additionalCount) return +1; return 0; } inline 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); }; typedef SortedArrayOf DefaultUVS; struct UVSMapping { inline int cmp (const hb_codepoint_t &codepoint) const { return unicodeValue.cmp (codepoint); } inline 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 */ GlyphID glyphID; /* Glyph ID of the UVS */ public: DEFINE_SIZE_STATIC (5); }; typedef SortedArrayOf NonDefaultUVS; struct VariationSelectorRecord { inline glyph_variant_t get_glyph (hb_codepoint_t codepoint, hb_codepoint_t *glyph, const void *base) const { int i; const DefaultUVS &defaults = base+defaultUVS; i = defaults.bsearch (codepoint); if (i != -1) return GLYPH_VARIANT_USE_DEFAULT; const NonDefaultUVS &nonDefaults = base+nonDefaultUVS; i = nonDefaults.bsearch (codepoint); if (i != -1) { *glyph = nonDefaults[i].glyphID; return GLYPH_VARIANT_FOUND; } return GLYPH_VARIANT_NOT_FOUND; } inline int cmp (const hb_codepoint_t &variation_selector) const { return varSelector.cmp (variation_selector); } inline 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)); } HBUINT24 varSelector; /* Variation selector. */ LOffsetTo defaultUVS; /* Offset to Default UVS Table. May be 0. */ LOffsetTo nonDefaultUVS; /* Offset to Non-Default UVS Table. May be 0. */ public: DEFINE_SIZE_STATIC (11); }; struct CmapSubtableFormat14 { inline glyph_variant_t get_glyph_variant (hb_codepoint_t codepoint, hb_codepoint_t variation_selector, hb_codepoint_t *glyph) const { return record[record.bsearch(variation_selector)].get_glyph (codepoint, glyph, this); } inline 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. */ SortedArrayOf 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. */ inline 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; } } inline bool sanitize (hb_sanitize_context_t *c) const { TRACE_SANITIZE (this); if (!u.format.sanitize (c)) return_trace (false); switch (u.format) { case 0: return_trace (u.format0 .sanitize (c)); case 4: return_trace (u.format4 .sanitize (c)); case 6: return_trace (u.format6 .sanitize (c)); case 10: return_trace (u.format10.sanitize (c)); case 12: return_trace (u.format12.sanitize (c)); case 13: return_trace (u.format13.sanitize (c)); case 14: return_trace (u.format14.sanitize (c)); default:return_trace (true); } } public: union { HBUINT16 format; /* Format identifier */ CmapSubtableFormat0 format0; CmapSubtableFormat4 format4; CmapSubtableFormat6 format6; CmapSubtableFormat10 format10; CmapSubtableFormat12 format12; CmapSubtableFormat13 format13; CmapSubtableFormat14 format14; } u; public: DEFINE_SIZE_UNION (2, format); }; struct EncodingRecord { inline 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; } inline bool sanitize (hb_sanitize_context_t *c, const void *base) const { TRACE_SANITIZE (this); return_trace (c->check_struct (this) && subtable.sanitize (c, base)); } HBUINT16 platformID; /* Platform ID. */ HBUINT16 encodingID; /* Platform-specific encoding ID. */ LOffsetTo subtable; /* Byte offset from beginning of table to the subtable for this encoding. */ public: DEFINE_SIZE_STATIC (8); }; struct cmap { static const hb_tag_t tableTag = HB_OT_TAG_cmap; struct subset_plan { subset_plan(void) { format4_segments.init(); format12_groups.init(); } ~subset_plan(void) { format4_segments.fini(); format12_groups.fini(); } inline size_t final_size() const { return 4 // header + 8 * 3 // 3 EncodingRecord + CmapSubtableFormat4::get_sub_table_size (this->format4_segments) + CmapSubtableFormat12::get_sub_table_size (this->format12_groups); } // Format 4 hb_vector_t format4_segments; // Format 12 hb_vector_t format12_groups; }; inline bool sanitize (hb_sanitize_context_t *c) const { TRACE_SANITIZE (this); return_trace (c->check_struct (this) && likely (version == 0) && encodingRecord.sanitize (c, this)); } inline bool _create_plan (const hb_subset_plan_t *plan, subset_plan *cmap_plan) const { if (unlikely( !CmapSubtableFormat4::create_sub_table_plan (plan, &cmap_plan->format4_segments))) return false; return CmapSubtableFormat12::create_sub_table_plan (plan, &cmap_plan->format12_groups); } inline bool _subset (const hb_subset_plan_t *plan, const subset_plan &cmap_subset_plan, size_t dest_sz, void *dest) const { hb_serialize_context_t c (dest, dest_sz); cmap *table = c.start_serialize (); if (unlikely (!c.extend_min (*table))) { return false; } table->version.set (0); if (unlikely (!table->encodingRecord.serialize (&c, /* numTables */ 3))) return false; // TODO(grieger): Convert the below to a for loop // Format 4, Plat 0 Encoding Record EncodingRecord &format4_plat0_rec = table->encodingRecord[0]; format4_plat0_rec.platformID.set (0); // Unicode format4_plat0_rec.encodingID.set (3); // Format 4, Plat 3 Encoding Record EncodingRecord &format4_plat3_rec = table->encodingRecord[1]; format4_plat3_rec.platformID.set (3); // Windows format4_plat3_rec.encodingID.set (1); // Unicode BMP // Format 12 Encoding Record EncodingRecord &format12_rec = table->encodingRecord[2]; format12_rec.platformID.set (3); // Windows format12_rec.encodingID.set (10); // Unicode UCS-4 // Write out format 4 sub table { CmapSubtable &subtable = format4_plat0_rec.subtable.serialize (&c, table); format4_plat3_rec.subtable.set (format4_plat0_rec.subtable); subtable.u.format.set (4); CmapSubtableFormat4 &format4 = subtable.u.format4; if (unlikely (!format4.serialize (&c, plan, cmap_subset_plan.format4_segments))) return false; } // Write out format 12 sub table. { CmapSubtable &subtable = format12_rec.subtable.serialize (&c, table); subtable.u.format.set (12); CmapSubtableFormat12 &format12 = subtable.u.format12; if (unlikely (!format12.serialize (&c, cmap_subset_plan.format12_groups))) return false; } c.end_serialize (); return true; } inline bool subset (hb_subset_plan_t *plan) const { subset_plan cmap_subset_plan; if (unlikely (!_create_plan (plan, &cmap_subset_plan))) { DEBUG_MSG(SUBSET, nullptr, "Failed to generate a cmap subsetting plan."); return false; } // We now know how big our blob needs to be size_t dest_sz = cmap_subset_plan.final_size(); void *dest = malloc (dest_sz); if (unlikely (!dest)) { DEBUG_MSG(SUBSET, nullptr, "Unable to alloc %lu for cmap subset output", (unsigned long) dest_sz); return false; } if (unlikely (!_subset (plan, cmap_subset_plan, dest_sz, dest))) { DEBUG_MSG(SUBSET, nullptr, "Failed to perform subsetting of cmap."); free (dest); return false; } // all done, write the blob into dest hb_blob_t *cmap_prime = hb_blob_create ((const char *)dest, dest_sz, HB_MEMORY_MODE_READONLY, dest, free); bool result = plan->add_table (HB_OT_TAG_cmap, cmap_prime); hb_blob_destroy (cmap_prime); return result; } struct accelerator_t { inline void init (hb_face_t *face) { this->blob = hb_sanitize_context_t().reference_table (face); const cmap *table = this->blob->as (); const CmapSubtable *subtable = nullptr; const CmapSubtableFormat14 *subtable_uvs = nullptr; bool symbol = false; /* 32-bit subtables. */ if (!subtable) subtable = table->find_subtable (3, 10); if (!subtable) subtable = table->find_subtable (0, 6); if (!subtable) subtable = table->find_subtable (0, 4); /* 16-bit subtables. */ if (!subtable) subtable = table->find_subtable (3, 1); if (!subtable) subtable = table->find_subtable (0, 3); if (!subtable) subtable = table->find_subtable (0, 2); if (!subtable) subtable = table->find_subtable (0, 1); if (!subtable) subtable = table->find_subtable (0, 0); if (!subtable) { subtable = table->find_subtable (3, 0); if (subtable) symbol = true; } /* Meh. */ if (!subtable) subtable = &Null(CmapSubtable); /* UVS subtable. */ if (!subtable_uvs) { const CmapSubtable *st = table->find_subtable (0, 5); if (st && st->u.format == 14) subtable_uvs = &st->u.format14; } /* Meh. */ if (!subtable_uvs) subtable_uvs = &Null(CmapSubtableFormat14); this->uvs_table = subtable_uvs; this->get_glyph_data = subtable; if (unlikely (symbol)) { this->get_glyph_func = get_glyph_from_symbol; this->get_all_codepoints_func = null_get_all_codepoints_func; } else { switch (subtable->u.format) { /* Accelerate format 4 and format 12. */ default: this->get_glyph_func = get_glyph_from; this->get_all_codepoints_func = null_get_all_codepoints_func; break; case 12: this->get_glyph_func = get_glyph_from; this->get_all_codepoints_func = get_all_codepoints_from; break; case 4: { this->format4_accel.init (&subtable->u.format4); this->get_glyph_data = &this->format4_accel; this->get_glyph_func = this->format4_accel.get_glyph_func; this->get_all_codepoints_func = this->format4_accel.get_all_codepoints_func; } break; } } } inline void fini (void) { hb_blob_destroy (this->blob); } inline bool get_nominal_glyph (hb_codepoint_t unicode, hb_codepoint_t *glyph) const { return this->get_glyph_func (this->get_glyph_data, unicode, glyph); } inline bool get_variation_glyph (hb_codepoint_t unicode, hb_codepoint_t variation_selector, hb_codepoint_t *glyph) const { switch (this->uvs_table->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); } inline void get_all_codepoints (hb_set_t *out) const { this->get_all_codepoints_func (get_glyph_data, out); } protected: typedef bool (*hb_cmap_get_glyph_func_t) (const void *obj, hb_codepoint_t codepoint, hb_codepoint_t *glyph); typedef void (*hb_cmap_get_all_codepoints_func_t) (const void *obj, hb_set_t *out); static inline void null_get_all_codepoints_func (const void *obj, hb_set_t *out) { // NOOP } template static inline 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 static inline void get_all_codepoints_from (const void *obj, hb_set_t *out) { const Type *typed_obj = (const Type *) obj; typed_obj->get_all_codepoints (out); } template static inline bool get_glyph_from_symbol (const void *obj, hb_codepoint_t codepoint, hb_codepoint_t *glyph) { const Type *typed_obj = (const Type *) obj; if (likely (typed_obj->get_glyph (codepoint, glyph))) return true; if (codepoint <= 0x00FFu) { /* For symbol-encoded OpenType fonts, we duplicate the * U+F000..F0FF range at U+0000..U+00FF. That's what * Windows seems to do, and that's hinted about at: * https://docs.microsoft.com/en-us/typography/opentype/spec/recom * under "Non-Standard (Symbol) Fonts". */ return typed_obj->get_glyph (0xF000u + codepoint, glyph); } return false; } private: hb_cmap_get_glyph_func_t get_glyph_func; const void *get_glyph_data; hb_cmap_get_all_codepoints_func_t get_all_codepoints_func; CmapSubtableFormat4::accelerator_t format4_accel; const CmapSubtableFormat14 *uvs_table; hb_blob_t *blob; }; protected: inline const CmapSubtable *find_subtable (unsigned int platform_id, unsigned int encoding_id) const { EncodingRecord key; key.platformID.set (platform_id); key.encodingID.set (encoding_id); /* Note: We can use bsearch, but since it has no performance * implications, we use lsearch and as such accept fonts with * unsorted subtable list. */ int result = encodingRecord./*bsearch*/lsearch (key); if (result == -1 || !encodingRecord[result].subtable) return nullptr; return &(this+encodingRecord[result].subtable); } protected: HBUINT16 version; /* Table version number (0). */ SortedArrayOf encodingRecord; /* Encoding tables. */ public: DEFINE_SIZE_ARRAY (4, encodingRecord); }; } /* namespace OT */ #endif /* HB_OT_CMAP_TABLE_HH */