diff options
Diffstat (limited to 'src/3rdparty/harfbuzz-ng/src/hb-ot-color-cbdt-table.hh')
| -rw-r--r-- | src/3rdparty/harfbuzz-ng/src/hb-ot-color-cbdt-table.hh | 640 |
1 files changed, 545 insertions, 95 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-ot-color-cbdt-table.hh b/src/3rdparty/harfbuzz-ng/src/hb-ot-color-cbdt-table.hh index 3498d3b360..e285acec3d 100644 --- a/src/3rdparty/harfbuzz-ng/src/hb-ot-color-cbdt-table.hh +++ b/src/3rdparty/harfbuzz-ng/src/hb-ot-color-cbdt-table.hh @@ -21,7 +21,7 @@ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. * - * Google Author(s): Seigo Nonaka + * Google Author(s): Seigo Nonaka, Calder Kitagawa */ #ifndef HB_OT_COLOR_CBDT_TABLE_HH @@ -43,6 +43,35 @@ namespace OT { +struct cblc_bitmap_size_subset_context_t +{ + const char *cbdt; + unsigned int cbdt_length; + hb_vector_t<char> *cbdt_prime; + unsigned int size; /* INOUT + * Input: old size of IndexSubtable + * Output: new size of IndexSubtable + */ + unsigned int num_tables; /* INOUT + * Input: old number of subtables. + * Output: new number of subtables. + */ + hb_codepoint_t start_glyph; /* OUT */ + hb_codepoint_t end_glyph; /* OUT */ +}; + +static inline bool +_copy_data_to_cbdt (hb_vector_t<char> *cbdt_prime, + const void *data, + unsigned length) +{ + unsigned int new_len = cbdt_prime->length + length; + if (unlikely (!cbdt_prime->alloc (new_len))) return false; + memcpy (cbdt_prime->arrayZ + cbdt_prime->length, data, length); + cbdt_prime->length = new_len; + return true; +} + struct SmallGlyphMetrics { bool sanitize (hb_sanitize_context_t *c) const @@ -56,7 +85,7 @@ struct SmallGlyphMetrics extents->x_bearing = font->em_scale_x (bearingX); extents->y_bearing = font->em_scale_y (bearingY); extents->width = font->em_scale_x (width); - extents->height = font->em_scale_y (-height); + extents->height = font->em_scale_y (-static_cast<int>(height)); } HBUINT8 height; @@ -65,7 +94,7 @@ struct SmallGlyphMetrics HBINT8 bearingY; HBUINT8 advance; public: - DEFINE_SIZE_STATIC(5); + DEFINE_SIZE_STATIC (5); }; struct BigGlyphMetrics : SmallGlyphMetrics @@ -74,7 +103,7 @@ struct BigGlyphMetrics : SmallGlyphMetrics HBINT8 vertBearingY; HBUINT8 vertAdvance; public: - DEFINE_SIZE_STATIC(8); + DEFINE_SIZE_STATIC (8); }; struct SBitLineMetrics @@ -98,7 +127,7 @@ struct SBitLineMetrics HBINT8 padding1; HBINT8 padding2; public: - DEFINE_SIZE_STATIC(12); + DEFINE_SIZE_STATIC (12); }; @@ -118,7 +147,7 @@ struct IndexSubtableHeader HBUINT16 imageFormat; HBUINT32 imageDataOffset; public: - DEFINE_SIZE_STATIC(8); + DEFINE_SIZE_STATIC (8); }; template <typename OffsetType> @@ -143,11 +172,23 @@ struct IndexSubtableFormat1Or3 return true; } + bool add_offset (hb_serialize_context_t *c, + unsigned int offset, + unsigned int *size /* OUT (accumulated) */) + { + TRACE_SERIALIZE (this); + Offset<OffsetType> embedded_offset; + embedded_offset = offset; + *size += sizeof (OffsetType); + auto *o = c->embed (embedded_offset); + return_trace ((bool) o); + } + IndexSubtableHeader header; UnsizedArrayOf<Offset<OffsetType>> - offsetArrayZ; + offsetArrayZ; public: - DEFINE_SIZE_ARRAY(8, offsetArrayZ); + DEFINE_SIZE_ARRAY (8, offsetArrayZ); }; struct IndexSubtableFormat1 : IndexSubtableFormat1Or3<HBUINT32> {}; @@ -159,35 +200,153 @@ struct IndexSubtable { TRACE_SANITIZE (this); if (!u.header.sanitize (c)) return_trace (false); - switch (u.header.indexFormat) { + switch (u.header.indexFormat) + { case 1: return_trace (u.format1.sanitize (c, glyph_count)); case 3: return_trace (u.format3.sanitize (c, glyph_count)); default:return_trace (true); } } + bool + finish_subtable (hb_serialize_context_t *c, + unsigned int cbdt_prime_len, + unsigned int num_glyphs, + unsigned int *size /* OUT (accumulated) */) + { + TRACE_SERIALIZE (this); + + unsigned int local_offset = cbdt_prime_len - u.header.imageDataOffset; + switch (u.header.indexFormat) + { + case 1: return_trace (u.format1.add_offset (c, local_offset, size)); + case 3: { + if (!u.format3.add_offset (c, local_offset, size)) + return_trace (false); + if (!(num_glyphs & 0x01)) // Pad to 32-bit alignment if needed. + return_trace (u.format3.add_offset (c, 0, size)); + return_trace (true); + } + // TODO: implement 2, 4, 5. + case 2: case 4: // No-op. + case 5: // Pad to 32-bit aligned. + default: return_trace (false); + } + } + + bool + fill_missing_glyphs (hb_serialize_context_t *c, + unsigned int cbdt_prime_len, + unsigned int num_missing, + unsigned int *size /* OUT (accumulated) */, + unsigned int *num_glyphs /* OUT (accumulated) */) + { + TRACE_SERIALIZE (this); + + unsigned int local_offset = cbdt_prime_len - u.header.imageDataOffset; + switch (u.header.indexFormat) + { + case 1: { + for (unsigned int i = 0; i < num_missing; i++) + { + if (unlikely (!u.format1.add_offset (c, local_offset, size))) + return_trace (false); + *num_glyphs += 1; + } + return_trace (true); + } + case 3: { + for (unsigned int i = 0; i < num_missing; i++) + { + if (unlikely (!u.format3.add_offset (c, local_offset, size))) + return_trace (false); + *num_glyphs += 1; + } + return_trace (true); + } + // TODO: implement 2, 4, 5. + case 2: // Add empty space in cbdt_prime?. + case 4: case 5: // No-op as sparse is supported. + default: return_trace (false); + } + } + + bool + copy_glyph_at_idx (hb_serialize_context_t *c, unsigned int idx, + const char *cbdt, unsigned int cbdt_length, + hb_vector_t<char> *cbdt_prime /* INOUT */, + IndexSubtable *subtable_prime /* INOUT */, + unsigned int *size /* OUT (accumulated) */) const + { + TRACE_SERIALIZE (this); + + unsigned int offset, length, format; + if (unlikely (!get_image_data (idx, &offset, &length, &format))) return_trace (false); + if (unlikely (offset > cbdt_length || cbdt_length - offset < length)) return_trace (false); + + auto *header_prime = subtable_prime->get_header (); + unsigned int new_local_offset = cbdt_prime->length - (unsigned int) header_prime->imageDataOffset; + if (unlikely (!_copy_data_to_cbdt (cbdt_prime, cbdt + offset, length))) return_trace (false); + + return_trace (subtable_prime->add_offset (c, new_local_offset, size)); + } + + bool + add_offset (hb_serialize_context_t *c, unsigned int local_offset, + unsigned int *size /* OUT (accumulated) */) + { + TRACE_SERIALIZE (this); + switch (u.header.indexFormat) + { + case 1: return_trace (u.format1.add_offset (c, local_offset, size)); + case 3: return_trace (u.format3.add_offset (c, local_offset, size)); + // TODO: Implement tables 2, 4, 5 + case 2: // Should be a no-op. + case 4: case 5: // Handle sparse cases. + default: return_trace (false); + } + } + bool get_extents (hb_glyph_extents_t *extents HB_UNUSED) const { - switch (u.header.indexFormat) { + switch (u.header.indexFormat) + { case 2: case 5: /* TODO */ case 1: case 3: case 4: /* Variable-metrics formats do not have metrics here. */ default:return (false); } } - bool get_image_data (unsigned int idx, - unsigned int *offset, - unsigned int *length, - unsigned int *format) const + bool + get_image_data (unsigned int idx, unsigned int *offset, + unsigned int *length, unsigned int *format) const { *format = u.header.imageFormat; - switch (u.header.indexFormat) { + switch (u.header.indexFormat) + { case 1: return u.format1.get_image_data (idx, offset, length); case 3: return u.format3.get_image_data (idx, offset, length); default: return false; } } + const IndexSubtableHeader* get_header () const { return &u.header; } + + void populate_header (unsigned index_format, + unsigned image_format, + unsigned int image_data_offset, + unsigned int *size) + { + u.header.indexFormat = index_format; + u.header.imageFormat = image_format; + u.header.imageDataOffset = image_data_offset; + switch (u.header.indexFormat) + { + case 1: *size += IndexSubtableFormat1::min_size; break; + case 3: *size += IndexSubtableFormat3::min_size; break; + } + } + protected: union { IndexSubtableHeader header; @@ -209,12 +368,135 @@ struct IndexSubtableRecord offsetToSubtable.sanitize (c, base, lastGlyphIndex - firstGlyphIndex + 1)); } - bool get_extents (hb_glyph_extents_t *extents, - const void *base) const + const IndexSubtable* get_subtable (const void *base) const { - return (base+offsetToSubtable).get_extents (extents); + return &(base+offsetToSubtable); } + bool add_new_subtable (hb_subset_context_t* c, + cblc_bitmap_size_subset_context_t *bitmap_size_context, + IndexSubtableRecord *record, + const hb_vector_t<hb_pair_t<hb_codepoint_t, const IndexSubtableRecord*>> *lookup, /* IN */ + const void *base, + unsigned int *start /* INOUT */) const + { + TRACE_SERIALIZE (this); + + auto *subtable = c->serializer->start_embed<IndexSubtable> (); + if (unlikely (!subtable)) return_trace (false); + if (unlikely (!c->serializer->extend_min (subtable))) return_trace (false); + + auto *old_subtable = get_subtable (base); + auto *old_header = old_subtable->get_header (); + + subtable->populate_header (old_header->indexFormat, + old_header->imageFormat, + bitmap_size_context->cbdt_prime->length, + &bitmap_size_context->size); + + unsigned int num_glyphs = 0; + bool early_exit = false; + for (unsigned int i = *start; i < lookup->length; i++) + { + hb_codepoint_t new_gid = (*lookup)[i].first; + const IndexSubtableRecord *next_record = (*lookup)[i].second; + const IndexSubtable *next_subtable = next_record->get_subtable (base); + auto *next_header = next_subtable->get_header (); + if (next_header != old_header) + { + *start = i; + early_exit = true; + break; + } + unsigned int num_missing = record->add_glyph_for_subset (new_gid); + if (unlikely (!subtable->fill_missing_glyphs (c->serializer, + bitmap_size_context->cbdt_prime->length, + num_missing, + &bitmap_size_context->size, + &num_glyphs))) + return_trace (false); + + hb_codepoint_t old_gid = 0; + c->plan->old_gid_for_new_gid (new_gid, &old_gid); + if (old_gid < next_record->firstGlyphIndex) + return_trace (false); + + unsigned int old_idx = (unsigned int) old_gid - next_record->firstGlyphIndex; + if (unlikely (!next_subtable->copy_glyph_at_idx (c->serializer, + old_idx, + bitmap_size_context->cbdt, + bitmap_size_context->cbdt_length, + bitmap_size_context->cbdt_prime, + subtable, + &bitmap_size_context->size))) + return_trace (false); + num_glyphs += 1; + } + if (!early_exit) + *start = lookup->length; + if (unlikely (!subtable->finish_subtable (c->serializer, + bitmap_size_context->cbdt_prime->length, + num_glyphs, + &bitmap_size_context->size))) + return_trace (false); + return_trace (true); + } + + bool add_new_record (hb_subset_context_t *c, + cblc_bitmap_size_subset_context_t *bitmap_size_context, + const hb_vector_t<hb_pair_t<hb_codepoint_t, const IndexSubtableRecord*>> *lookup, /* IN */ + const void *base, + unsigned int *start, /* INOUT */ + hb_vector_t<IndexSubtableRecord>* records /* INOUT */) const + { + TRACE_SERIALIZE (this); + auto snap = c->serializer->snapshot (); + unsigned int old_size = bitmap_size_context->size; + unsigned int old_cbdt_prime_length = bitmap_size_context->cbdt_prime->length; + + // Set to invalid state to indicate filling glyphs is not yet started. + if (unlikely (!c->serializer->check_success (records->resize (records->length + 1)))) + return_trace (false); + + (*records)[records->length - 1].firstGlyphIndex = 1; + (*records)[records->length - 1].lastGlyphIndex = 0; + bitmap_size_context->size += IndexSubtableRecord::min_size; + + c->serializer->push (); + + if (unlikely (!add_new_subtable (c, bitmap_size_context, &((*records)[records->length - 1]), lookup, base, start))) + { + c->serializer->pop_discard (); + c->serializer->revert (snap); + bitmap_size_context->cbdt_prime->shrink (old_cbdt_prime_length); + bitmap_size_context->size = old_size; + records->resize (records->length - 1); + return_trace (false); + } + + bitmap_size_context->num_tables += 1; + return_trace (true); + } + + unsigned int add_glyph_for_subset (hb_codepoint_t gid) + { + if (firstGlyphIndex > lastGlyphIndex) + { + firstGlyphIndex = gid; + lastGlyphIndex = gid; + return 0; + } + // TODO maybe assert? this shouldn't occur. + if (lastGlyphIndex > gid) + return 0; + unsigned int num_missing = (unsigned int) (gid - lastGlyphIndex - 1); + lastGlyphIndex = gid; + return num_missing; + } + + bool get_extents (hb_glyph_extents_t *extents, const void *base) const + { return (base+offsetToSubtable).get_extents (extents); } + bool get_image_data (unsigned int gid, const void *base, unsigned int *offset, @@ -230,7 +512,7 @@ struct IndexSubtableRecord HBGlyphID lastGlyphIndex; LOffsetTo<IndexSubtable> offsetToSubtable; public: - DEFINE_SIZE_STATIC(8); + DEFINE_SIZE_STATIC (8); }; struct IndexSubtableArray @@ -243,6 +525,79 @@ struct IndexSubtableArray return_trace (indexSubtablesZ.sanitize (c, count, this)); } + void + build_lookup (hb_subset_context_t *c, cblc_bitmap_size_subset_context_t *bitmap_size_context, + hb_vector_t<hb_pair_t<hb_codepoint_t, + const IndexSubtableRecord*>> *lookup /* OUT */) const + { + bool start_glyph_is_set = false; + for (hb_codepoint_t new_gid = 0; new_gid < c->plan->num_output_glyphs (); new_gid++) + { + hb_codepoint_t old_gid; + if (unlikely (!c->plan->old_gid_for_new_gid (new_gid, &old_gid))) continue; + + const IndexSubtableRecord* record = find_table (old_gid, bitmap_size_context->num_tables); + if (unlikely (!record)) continue; + + // Don't add gaps to the lookup. The best way to determine if a glyph is a + // gap is that it has no image data. + unsigned int offset, length, format; + if (unlikely (!record->get_image_data (old_gid, this, &offset, &length, &format))) continue; + + lookup->push (hb_pair_t<hb_codepoint_t, const IndexSubtableRecord*> (new_gid, record)); + + if (!start_glyph_is_set) + { + bitmap_size_context->start_glyph = new_gid; + start_glyph_is_set = true; + } + + bitmap_size_context->end_glyph = new_gid; + } + } + + bool + subset (hb_subset_context_t *c, + cblc_bitmap_size_subset_context_t *bitmap_size_context) const + { + TRACE_SUBSET (this); + + auto *dst = c->serializer->start_embed<IndexSubtableArray> (); + if (unlikely (!dst)) return_trace (false); + + hb_vector_t<hb_pair_t<hb_codepoint_t, const IndexSubtableRecord*>> lookup; + build_lookup (c, bitmap_size_context, &lookup); + if (unlikely (!c->serializer->propagate_error (lookup))) + return false; + + bitmap_size_context->size = 0; + bitmap_size_context->num_tables = 0; + hb_vector_t<IndexSubtableRecord> records; + for (unsigned int start = 0; start < lookup.length;) + { + if (unlikely (!lookup[start].second->add_new_record (c, bitmap_size_context, &lookup, this, &start, &records))) + { + // Discard any leftover pushes to the serializer from successful records. + for (unsigned int i = 0; i < records.length; i++) + c->serializer->pop_discard (); + return_trace (false); + } + } + + /* Workaround to ensure offset ordering is from least to greatest when + * resolving links. */ + hb_vector_t<hb_serialize_context_t::objidx_t> objidxs; + for (unsigned int i = 0; i < records.length; i++) + objidxs.push (c->serializer->pop_pack ()); + for (unsigned int i = 0; i < records.length; i++) + { + IndexSubtableRecord* record = c->serializer->embed (records[i]); + if (unlikely (!record)) return_trace (false); + c->serializer->add_link (record->offsetToSubtable, objidxs[records.length - 1 - i]); + } + return_trace (true); + } + public: const IndexSubtableRecord* find_table (hb_codepoint_t glyph, unsigned int numTables) const { @@ -274,14 +629,48 @@ struct BitmapSizeTable vertical.sanitize (c)); } - const IndexSubtableRecord *find_table (hb_codepoint_t glyph, - const void *base, - const void **out_base) const + const IndexSubtableRecord * + find_table (hb_codepoint_t glyph, const void *base, const void **out_base) const { *out_base = &(base+indexSubtableArrayOffset); return (base+indexSubtableArrayOffset).find_table (glyph, numberOfIndexSubtables); } + bool + subset (hb_subset_context_t *c, const void *base, + const char *cbdt, unsigned int cbdt_length, + hb_vector_t<char> *cbdt_prime /* INOUT */) const + { + TRACE_SUBSET (this); + auto *out_table = c->serializer->embed (this); + if (unlikely (!out_table)) return_trace (false); + + cblc_bitmap_size_subset_context_t bitmap_size_context; + bitmap_size_context.cbdt = cbdt; + bitmap_size_context.cbdt_length = cbdt_length; + bitmap_size_context.cbdt_prime = cbdt_prime; + bitmap_size_context.size = indexTablesSize; + bitmap_size_context.num_tables = numberOfIndexSubtables; + bitmap_size_context.start_glyph = 1; + bitmap_size_context.end_glyph = 0; + + if (!out_table->indexSubtableArrayOffset.serialize_subset (c, + indexSubtableArrayOffset, + base, + &bitmap_size_context)) + return_trace (false); + if (!bitmap_size_context.size || + !bitmap_size_context.num_tables || + bitmap_size_context.start_glyph > bitmap_size_context.end_glyph) + return_trace (false); + + out_table->indexTablesSize = bitmap_size_context.size; + out_table->numberOfIndexSubtables = bitmap_size_context.num_tables; + out_table->startGlyphIndex = bitmap_size_context.start_glyph; + out_table->endGlyphIndex = bitmap_size_context.end_glyph; + return_trace (true); + } + protected: LNNOffsetTo<IndexSubtableArray> indexSubtableArrayOffset; @@ -297,7 +686,7 @@ struct BitmapSizeTable HBUINT8 bitDepth; HBINT8 flags; public: - DEFINE_SIZE_STATIC(48); + DEFINE_SIZE_STATIC (48); }; @@ -310,7 +699,7 @@ struct GlyphBitmapDataFormat17 SmallGlyphMetrics glyphMetrics; LArrayOf<HBUINT8> data; public: - DEFINE_SIZE_ARRAY(9, data); + DEFINE_SIZE_ARRAY (9, data); }; struct GlyphBitmapDataFormat18 @@ -318,14 +707,14 @@ struct GlyphBitmapDataFormat18 BigGlyphMetrics glyphMetrics; LArrayOf<HBUINT8> data; public: - DEFINE_SIZE_ARRAY(12, data); + DEFINE_SIZE_ARRAY (12, data); }; struct GlyphBitmapDataFormat19 { LArrayOf<HBUINT8> data; public: - DEFINE_SIZE_ARRAY(4, data); + DEFINE_SIZE_ARRAY (4, data); }; struct CBLC @@ -342,12 +731,50 @@ struct CBLC sizeTables.sanitize (c, this)); } + static bool + sink_cbdt (hb_subset_context_t *c, hb_vector_t<char>* cbdt_prime) + { + hb_blob_t *cbdt_prime_blob = hb_blob_create (cbdt_prime->arrayZ, + cbdt_prime->length, + HB_MEMORY_MODE_WRITABLE, + cbdt_prime->arrayZ, + free); + cbdt_prime->init (); // Leak arrayZ to the blob. + bool ret = c->plan->add_table (HB_OT_TAG_CBDT, cbdt_prime_blob); + hb_blob_destroy (cbdt_prime_blob); + return ret; + } + + bool + subset_size_table (hb_subset_context_t *c, const BitmapSizeTable& table, + const char *cbdt /* IN */, unsigned int cbdt_length, + CBLC *cblc_prime /* INOUT */, hb_vector_t<char> *cbdt_prime /* INOUT */) const + { + TRACE_SUBSET (this); + cblc_prime->sizeTables.len++; + + auto snap = c->serializer->snapshot (); + auto cbdt_prime_len = cbdt_prime->length; + + if (!table.subset (c, this, cbdt, cbdt_length, cbdt_prime)) + { + cblc_prime->sizeTables.len--; + c->serializer->revert (snap); + cbdt_prime->shrink (cbdt_prime_len); + return_trace (false); + } + return_trace (true); + } + + // Implemented in cc file as it depends on definition of CBDT. + HB_INTERNAL bool subset (hb_subset_context_t *c) const; + protected: const BitmapSizeTable &choose_strike (hb_font_t *font) const { unsigned count = sizeTables.len; if (unlikely (!count)) - return Null(BitmapSizeTable); + return Null (BitmapSizeTable); unsigned int requested_ppem = hb_max (font->x_ppem, font->y_ppem); if (!requested_ppem) @@ -373,7 +800,7 @@ struct CBLC FixedVersion<> version; LArrayOf<BitmapSizeTable> sizeTables; public: - DEFINE_SIZE_ARRAY(8, sizeTables); + DEFINE_SIZE_ARRAY (8, sizeTables); }; struct CBDT @@ -384,8 +811,8 @@ struct CBDT { void init (hb_face_t *face) { - cblc = hb_sanitize_context_t().reference_table<CBLC> (face); - cbdt = hb_sanitize_context_t().reference_table<CBDT> (face); + cblc = hb_sanitize_context_t ().reference_table<CBLC> (face); + cbdt = hb_sanitize_context_t ().reference_table<CBDT> (face); upem = hb_face_get_upem (face); } @@ -396,8 +823,8 @@ struct CBDT this->cbdt.destroy (); } - bool get_extents (hb_font_t *font, hb_codepoint_t glyph, - hb_glyph_extents_t *extents) const + bool + get_extents (hb_font_t *font, hb_codepoint_t glyph, hb_glyph_extents_t *extents) const { const void *base; const BitmapSizeTable &strike = this->cblc->choose_strike (font); @@ -412,33 +839,27 @@ struct CBDT if (!subtable_record->get_image_data (glyph, base, &image_offset, &image_length, &image_format)) return false; + unsigned int cbdt_len = cbdt.get_length (); + if (unlikely (image_offset > cbdt_len || cbdt_len - image_offset < image_length)) + return false; + + switch (image_format) { - unsigned int cbdt_len = cbdt.get_length (); - if (unlikely (image_offset > cbdt_len || cbdt_len - image_offset < image_length)) + case 17: { + if (unlikely (image_length < GlyphBitmapDataFormat17::min_size)) return false; - - switch (image_format) - { - case 17: { - if (unlikely (image_length < GlyphBitmapDataFormat17::min_size)) - return false; - const GlyphBitmapDataFormat17& glyphFormat17 = - StructAtOffset<GlyphBitmapDataFormat17> (this->cbdt, image_offset); - glyphFormat17.glyphMetrics.get_extents (font, extents); - break; - } - case 18: { - if (unlikely (image_length < GlyphBitmapDataFormat18::min_size)) - return false; - const GlyphBitmapDataFormat18& glyphFormat18 = - StructAtOffset<GlyphBitmapDataFormat18> (this->cbdt, image_offset); - glyphFormat18.glyphMetrics.get_extents (font, extents); - break; - } - default: - // TODO: Support other image formats. - return false; - } + auto &glyphFormat17 = StructAtOffset<GlyphBitmapDataFormat17> (this->cbdt, image_offset); + glyphFormat17.glyphMetrics.get_extents (font, extents); + break; + } + case 18: { + if (unlikely (image_length < GlyphBitmapDataFormat18::min_size)) + return false; + auto &glyphFormat18 = StructAtOffset<GlyphBitmapDataFormat18> (this->cbdt, image_offset); + glyphFormat18.glyphMetrics.get_extents (font, extents); + break; + } + default: return false; /* TODO: Support other image formats. */ } /* Convert to font units. */ @@ -452,8 +873,8 @@ struct CBDT return true; } - hb_blob_t* reference_png (hb_font_t *font, - hb_codepoint_t glyph) const + hb_blob_t* + reference_png (hb_font_t *font, hb_codepoint_t glyph) const { const void *base; const BitmapSizeTable &strike = this->cblc->choose_strike (font); @@ -465,44 +886,41 @@ struct CBDT if (!subtable_record->get_image_data (glyph, base, &image_offset, &image_length, &image_format)) return hb_blob_get_empty (); + unsigned int cbdt_len = cbdt.get_length (); + if (unlikely (image_offset > cbdt_len || cbdt_len - image_offset < image_length)) + return hb_blob_get_empty (); + + switch (image_format) + { + case 17: { - unsigned int cbdt_len = cbdt.get_length (); - if (unlikely (image_offset > cbdt_len || cbdt_len - image_offset < image_length)) + if (unlikely (image_length < GlyphBitmapDataFormat17::min_size)) return hb_blob_get_empty (); - - switch (image_format) - { - case 17: { - if (unlikely (image_length < GlyphBitmapDataFormat17::min_size)) - return hb_blob_get_empty (); - const GlyphBitmapDataFormat17& glyphFormat17 = - StructAtOffset<GlyphBitmapDataFormat17> (this->cbdt, image_offset); - return hb_blob_create_sub_blob (cbdt.get_blob (), - image_offset + GlyphBitmapDataFormat17::min_size, - glyphFormat17.data.len); - } - case 18: { - if (unlikely (image_length < GlyphBitmapDataFormat18::min_size)) - return hb_blob_get_empty (); - const GlyphBitmapDataFormat18& glyphFormat18 = - StructAtOffset<GlyphBitmapDataFormat18> (this->cbdt, image_offset); - return hb_blob_create_sub_blob (cbdt.get_blob (), - image_offset + GlyphBitmapDataFormat18::min_size, - glyphFormat18.data.len); - } - case 19: { - if (unlikely (image_length < GlyphBitmapDataFormat19::min_size)) - return hb_blob_get_empty (); - const GlyphBitmapDataFormat19& glyphFormat19 = - StructAtOffset<GlyphBitmapDataFormat19> (this->cbdt, image_offset); - return hb_blob_create_sub_blob (cbdt.get_blob (), - image_offset + GlyphBitmapDataFormat19::min_size, - glyphFormat19.data.len); - } - } + auto &glyphFormat17 = StructAtOffset<GlyphBitmapDataFormat17> (this->cbdt, image_offset); + return hb_blob_create_sub_blob (cbdt.get_blob (), + image_offset + GlyphBitmapDataFormat17::min_size, + glyphFormat17.data.len); + } + case 18: + { + if (unlikely (image_length < GlyphBitmapDataFormat18::min_size)) + return hb_blob_get_empty (); + auto &glyphFormat18 = StructAtOffset<GlyphBitmapDataFormat18> (this->cbdt, image_offset); + return hb_blob_create_sub_blob (cbdt.get_blob (), + image_offset + GlyphBitmapDataFormat18::min_size, + glyphFormat18.data.len); + } + case 19: + { + if (unlikely (image_length < GlyphBitmapDataFormat19::min_size)) + return hb_blob_get_empty (); + auto &glyphFormat19 = StructAtOffset<GlyphBitmapDataFormat19> (this->cbdt, image_offset); + return hb_blob_create_sub_blob (cbdt.get_blob (), + image_offset + GlyphBitmapDataFormat19::min_size, + glyphFormat19.data.len); + } + default: return hb_blob_get_empty (); /* TODO: Support other image formats. */ } - - return hb_blob_get_empty (); } bool has_data () const { return cbdt.get_length (); } @@ -525,9 +943,41 @@ struct CBDT FixedVersion<> version; UnsizedArrayOf<HBUINT8> dataZ; public: - DEFINE_SIZE_ARRAY(4, dataZ); + DEFINE_SIZE_ARRAY (4, dataZ); }; +inline bool +CBLC::subset (hb_subset_context_t *c) const +{ + TRACE_SUBSET (this); + + auto *cblc_prime = c->serializer->start_embed<CBLC> (); + + // Use a vector as a secondary buffer as the tables need to be built in parallel. + hb_vector_t<char> cbdt_prime; + + if (unlikely (!cblc_prime)) return_trace (false); + if (unlikely (!c->serializer->extend_min (cblc_prime))) return_trace (false); + cblc_prime->version = version; + + hb_blob_t* cbdt_blob = hb_sanitize_context_t ().reference_table<CBDT> (c->plan->source); + unsigned int cbdt_length; + CBDT* cbdt = (CBDT *) hb_blob_get_data (cbdt_blob, &cbdt_length); + if (unlikely (cbdt_length < CBDT::min_size)) + { + hb_blob_destroy (cbdt_blob); + return_trace (false); + } + _copy_data_to_cbdt (&cbdt_prime, cbdt, CBDT::min_size); + + for (const BitmapSizeTable& table : + sizeTables.iter ()) + subset_size_table (c, table, (const char *) cbdt, cbdt_length, cblc_prime, &cbdt_prime); + + hb_blob_destroy (cbdt_blob); + + return_trace (CBLC::sink_cbdt (c, &cbdt_prime)); +} + struct CBDT_accelerator_t : CBDT::accelerator_t {}; } /* namespace OT */ |