diff options
Diffstat (limited to 'src/3rdparty/harfbuzz-ng/src/hb-ot-glyf-table.hh')
-rw-r--r-- | src/3rdparty/harfbuzz-ng/src/hb-ot-glyf-table.hh | 1081 |
1 files changed, 1 insertions, 1080 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-ot-glyf-table.hh b/src/3rdparty/harfbuzz-ng/src/hb-ot-glyf-table.hh index 571e50ea0c..c32ff7636d 100644 --- a/src/3rdparty/harfbuzz-ng/src/hb-ot-glyf-table.hh +++ b/src/3rdparty/harfbuzz-ng/src/hb-ot-glyf-table.hh @@ -30,1085 +30,6 @@ #ifndef HB_OT_GLYF_TABLE_HH #define HB_OT_GLYF_TABLE_HH -#include "hb-open-type.hh" -#include "hb-ot-head-table.hh" -#include "hb-ot-hmtx-table.hh" -#include "hb-ot-var-gvar-table.hh" - -#include <float.h> - -namespace OT { - - -/* - * loca -- Index to Location - * https://docs.microsoft.com/en-us/typography/opentype/spec/loca - */ -#define HB_OT_TAG_loca HB_TAG('l','o','c','a') - - -struct loca -{ - friend struct glyf; - - static constexpr hb_tag_t tableTag = HB_OT_TAG_loca; - - bool sanitize (hb_sanitize_context_t *c HB_UNUSED) const - { - TRACE_SANITIZE (this); - return_trace (true); - } - - protected: - UnsizedArrayOf<HBUINT8> - dataZ; /* Location data. */ - public: - DEFINE_SIZE_MIN (0); /* In reality, this is UNBOUNDED() type; but since we always - * check the size externally, allow Null() object of it by - * defining it _MIN instead. */ -}; - - -/* - * glyf -- TrueType Glyph Data - * https://docs.microsoft.com/en-us/typography/opentype/spec/glyf - */ -#define HB_OT_TAG_glyf HB_TAG('g','l','y','f') - - -struct glyf -{ - static constexpr hb_tag_t tableTag = HB_OT_TAG_glyf; - - bool sanitize (hb_sanitize_context_t *c HB_UNUSED) const - { - TRACE_SANITIZE (this); - /* Runtime checks as eager sanitizing each glyph is costy */ - return_trace (true); - } - - template<typename Iterator, - hb_requires (hb_is_source_of (Iterator, unsigned int))> - static bool - _add_loca_and_head (hb_subset_plan_t * plan, Iterator padded_offsets) - { - unsigned max_offset = + padded_offsets | hb_reduce(hb_add, 0); - unsigned num_offsets = padded_offsets.len () + 1; - bool use_short_loca = max_offset < 0x1FFFF; - unsigned entry_size = use_short_loca ? 2 : 4; - char *loca_prime_data = (char *) calloc (entry_size, num_offsets); - - if (unlikely (!loca_prime_data)) return false; - - DEBUG_MSG (SUBSET, nullptr, "loca entry_size %d num_offsets %d " - "max_offset %d size %d", - entry_size, num_offsets, max_offset, entry_size * num_offsets); - - if (use_short_loca) - _write_loca (padded_offsets, 1, hb_array ((HBUINT16*) loca_prime_data, num_offsets)); - else - _write_loca (padded_offsets, 0, hb_array ((HBUINT32*) loca_prime_data, num_offsets)); - - hb_blob_t * loca_blob = hb_blob_create (loca_prime_data, - entry_size * num_offsets, - HB_MEMORY_MODE_WRITABLE, - loca_prime_data, - free); - - bool result = plan->add_table (HB_OT_TAG_loca, loca_blob) - && _add_head_and_set_loca_version (plan, use_short_loca); - - hb_blob_destroy (loca_blob); - return result; - } - - template<typename IteratorIn, typename IteratorOut, - hb_requires (hb_is_source_of (IteratorIn, unsigned int)), - hb_requires (hb_is_sink_of (IteratorOut, unsigned))> - static void - _write_loca (IteratorIn it, unsigned right_shift, IteratorOut dest) - { - unsigned int offset = 0; - dest << 0; - + it - | hb_map ([=, &offset] (unsigned int padded_size) - { - offset += padded_size; - DEBUG_MSG (SUBSET, nullptr, "loca entry offset %d", offset); - return offset >> right_shift; - }) - | hb_sink (dest) - ; - } - - /* requires source of SubsetGlyph complains the identifier isn't declared */ - template <typename Iterator> - bool serialize (hb_serialize_context_t *c, - Iterator it, - const hb_subset_plan_t *plan) - { - TRACE_SERIALIZE (this); - for (const auto &_ : it) _.serialize (c, plan); - return_trace (true); - } - - /* Byte region(s) per glyph to output - unpadded, hints removed if so requested - If we fail to process a glyph we produce an empty (0-length) glyph */ - bool subset (hb_subset_context_t *c) const - { - TRACE_SUBSET (this); - - glyf *glyf_prime = c->serializer->start_embed <glyf> (); - if (unlikely (!c->serializer->check_success (glyf_prime))) return_trace (false); - - hb_vector_t<SubsetGlyph> glyphs; - _populate_subset_glyphs (c->plan, &glyphs); - - glyf_prime->serialize (c->serializer, hb_iter (glyphs), c->plan); - - auto padded_offsets = - + hb_iter (glyphs) - | hb_map (&SubsetGlyph::padded_size) - ; - - if (c->serializer->in_error ()) return_trace (false); - return_trace (c->serializer->check_success (_add_loca_and_head (c->plan, - padded_offsets))); - } - - template <typename SubsetGlyph> - void - _populate_subset_glyphs (const hb_subset_plan_t *plan, - hb_vector_t<SubsetGlyph> *glyphs /* OUT */) const - { - OT::glyf::accelerator_t glyf; - glyf.init (plan->source); - - + hb_range (plan->num_output_glyphs ()) - | hb_map ([&] (hb_codepoint_t new_gid) - { - SubsetGlyph subset_glyph = {0}; - subset_glyph.new_gid = new_gid; - - /* should never fail: all old gids should be mapped */ - if (!plan->old_gid_for_new_gid (new_gid, &subset_glyph.old_gid)) - return subset_glyph; - - subset_glyph.source_glyph = glyf.glyph_for_gid (subset_glyph.old_gid, true); - if (plan->drop_hints) subset_glyph.drop_hints_bytes (); - else subset_glyph.dest_start = subset_glyph.source_glyph.get_bytes (); - - return subset_glyph; - }) - | hb_sink (glyphs) - ; - - glyf.fini (); - } - - static bool - _add_head_and_set_loca_version (hb_subset_plan_t *plan, bool use_short_loca) - { - hb_blob_t *head_blob = hb_sanitize_context_t ().reference_table<head> (plan->source); - hb_blob_t *head_prime_blob = hb_blob_copy_writable_or_fail (head_blob); - hb_blob_destroy (head_blob); - - if (unlikely (!head_prime_blob)) - return false; - - head *head_prime = (head *) hb_blob_get_data_writable (head_prime_blob, nullptr); - head_prime->indexToLocFormat = use_short_loca ? 0 : 1; - bool success = plan->add_table (HB_OT_TAG_head, head_prime_blob); - - hb_blob_destroy (head_prime_blob); - return success; - } - - struct CompositeGlyphChain - { - enum composite_glyph_flag_t - { - ARG_1_AND_2_ARE_WORDS = 0x0001, - ARGS_ARE_XY_VALUES = 0x0002, - ROUND_XY_TO_GRID = 0x0004, - WE_HAVE_A_SCALE = 0x0008, - MORE_COMPONENTS = 0x0020, - WE_HAVE_AN_X_AND_Y_SCALE = 0x0040, - WE_HAVE_A_TWO_BY_TWO = 0x0080, - WE_HAVE_INSTRUCTIONS = 0x0100, - USE_MY_METRICS = 0x0200, - OVERLAP_COMPOUND = 0x0400, - SCALED_COMPONENT_OFFSET = 0x0800, - UNSCALED_COMPONENT_OFFSET = 0x1000 - }; - - unsigned int get_size () const - { - unsigned int size = min_size; - /* arg1 and 2 are int16 */ - if (flags & ARG_1_AND_2_ARE_WORDS) size += 4; - /* arg1 and 2 are int8 */ - else size += 2; - - /* One x 16 bit (scale) */ - if (flags & WE_HAVE_A_SCALE) size += 2; - /* Two x 16 bit (xscale, yscale) */ - else if (flags & WE_HAVE_AN_X_AND_Y_SCALE) size += 4; - /* Four x 16 bit (xscale, scale01, scale10, yscale) */ - else if (flags & WE_HAVE_A_TWO_BY_TWO) size += 8; - - return size; - } - - bool is_use_my_metrics () const { return flags & USE_MY_METRICS; } - bool is_anchored () const { return !(flags & ARGS_ARE_XY_VALUES); } - void get_anchor_points (unsigned int &point1, unsigned int &point2) const - { - const HBUINT8 *p = &StructAfter<const HBUINT8> (glyphIndex); - if (flags & ARG_1_AND_2_ARE_WORDS) - { - point1 = ((const HBUINT16 *) p)[0]; - point2 = ((const HBUINT16 *) p)[1]; - } - else - { - point1 = p[0]; - point2 = p[1]; - } - } - - void transform_points (contour_point_vector_t &points) const - { - float matrix[4]; - contour_point_t trans; - if (get_transformation (matrix, trans)) - { - if (scaled_offsets ()) - { - points.translate (trans); - points.transform (matrix); - } - else - { - points.transform (matrix); - points.translate (trans); - } - } - } - - protected: - bool scaled_offsets () const - { return (flags & (SCALED_COMPONENT_OFFSET | UNSCALED_COMPONENT_OFFSET)) == SCALED_COMPONENT_OFFSET; } - - bool get_transformation (float (&matrix)[4], contour_point_t &trans) const - { - matrix[0] = matrix[3] = 1.f; - matrix[1] = matrix[2] = 0.f; - - int tx, ty; - const HBINT8 *p = &StructAfter<const HBINT8> (glyphIndex); - if (flags & ARG_1_AND_2_ARE_WORDS) - { - tx = *(const HBINT16 *) p; - p += HBINT16::static_size; - ty = *(const HBINT16 *) p; - p += HBINT16::static_size; - } - else - { - tx = *p++; - ty = *p++; - } - if (is_anchored ()) tx = ty = 0; - - trans.init ((float) tx, (float) ty); - - { - const F2DOT14 *points = (const F2DOT14 *) p; - if (flags & WE_HAVE_A_SCALE) - { - matrix[0] = matrix[3] = points[0].to_float (); - return true; - } - else if (flags & WE_HAVE_AN_X_AND_Y_SCALE) - { - matrix[0] = points[0].to_float (); - matrix[3] = points[1].to_float (); - return true; - } - else if (flags & WE_HAVE_A_TWO_BY_TWO) - { - matrix[0] = points[0].to_float (); - matrix[1] = points[1].to_float (); - matrix[2] = points[2].to_float (); - matrix[3] = points[3].to_float (); - return true; - } - } - return tx || ty; - } - - public: - HBUINT16 flags; - HBGlyphID glyphIndex; - public: - DEFINE_SIZE_MIN (4); - }; - - struct composite_iter_t : hb_iter_with_fallback_t<composite_iter_t, const CompositeGlyphChain &> - { - typedef const CompositeGlyphChain *__item_t__; - composite_iter_t (hb_bytes_t glyph_, __item_t__ current_) : - glyph (glyph_), current (current_) - { if (!in_range (current)) current = nullptr; } - composite_iter_t () : glyph (hb_bytes_t ()), current (nullptr) {} - - const CompositeGlyphChain &__item__ () const { return *current; } - bool __more__ () const { return current; } - void __next__ () - { - if (!(current->flags & CompositeGlyphChain::MORE_COMPONENTS)) { current = nullptr; return; } - - const CompositeGlyphChain *possible = &StructAfter<CompositeGlyphChain, - CompositeGlyphChain> (*current); - if (!in_range (possible)) { current = nullptr; return; } - current = possible; - } - bool operator != (const composite_iter_t& o) const - { return glyph != o.glyph || current != o.current; } - - bool in_range (const CompositeGlyphChain *composite) const - { - return glyph.in_range (composite, CompositeGlyphChain::min_size) - && glyph.in_range (composite, composite->get_size ()); - } - - private: - hb_bytes_t glyph; - __item_t__ current; - }; - - struct Glyph - { - private: - struct GlyphHeader - { - bool has_data () const { return numberOfContours; } - - bool get_extents (hb_font_t *font, hb_codepoint_t gid, hb_glyph_extents_t *extents) const - { - /* Undocumented rasterizer behavior: shift glyph to the left by (lsb - xMin), i.e., xMin = lsb */ - /* extents->x_bearing = hb_min (glyph_header.xMin, glyph_header.xMax); */ - extents->x_bearing = font->em_scale_x (font->face->table.hmtx->get_side_bearing (gid)); - extents->y_bearing = font->em_scale_y (hb_max (yMin, yMax)); - extents->width = font->em_scale_x (hb_max (xMin, xMax) - hb_min (xMin, xMax)); - extents->height = font->em_scale_y (hb_min (yMin, yMax) - hb_max (yMin, yMax)); - - return true; - } - - HBINT16 numberOfContours; - /* If the number of contours is - * greater than or equal to zero, - * this is a simple glyph; if negative, - * this is a composite glyph. */ - FWORD xMin; /* Minimum x for coordinate data. */ - FWORD yMin; /* Minimum y for coordinate data. */ - FWORD xMax; /* Maximum x for coordinate data. */ - FWORD yMax; /* Maximum y for coordinate data. */ - public: - DEFINE_SIZE_STATIC (10); - }; - - struct SimpleGlyph - { - const GlyphHeader &header; - hb_bytes_t bytes; - SimpleGlyph (const GlyphHeader &header_, hb_bytes_t bytes_) : - header (header_), bytes (bytes_) {} - - unsigned int instruction_len_offset () const - { return GlyphHeader::static_size + 2 * header.numberOfContours; } - - unsigned int length (unsigned int instruction_len) const - { return instruction_len_offset () + 2 + instruction_len; } - - unsigned int instructions_length () const - { - unsigned int instruction_length_offset = instruction_len_offset (); - if (unlikely (instruction_length_offset + 2 > bytes.length)) return 0; - - const HBUINT16 &instructionLength = StructAtOffset<HBUINT16> (&bytes, instruction_length_offset); - /* Out of bounds of the current glyph */ - if (unlikely (length (instructionLength) > bytes.length)) return 0; - return instructionLength; - } - - enum simple_glyph_flag_t - { - FLAG_ON_CURVE = 0x01, - FLAG_X_SHORT = 0x02, - FLAG_Y_SHORT = 0x04, - FLAG_REPEAT = 0x08, - FLAG_X_SAME = 0x10, - FLAG_Y_SAME = 0x20, - FLAG_RESERVED1 = 0x40, - FLAG_RESERVED2 = 0x80 - }; - - const Glyph trim_padding () const - { - /* based on FontTools _g_l_y_f.py::trim */ - const char *glyph = bytes.arrayZ; - const char *glyph_end = glyph + bytes.length; - /* simple glyph w/contours, possibly trimmable */ - glyph += instruction_len_offset (); - - if (unlikely (glyph + 2 >= glyph_end)) return Glyph (); - unsigned int num_coordinates = StructAtOffset<HBUINT16> (glyph - 2, 0) + 1; - unsigned int num_instructions = StructAtOffset<HBUINT16> (glyph, 0); - - glyph += 2 + num_instructions; - if (unlikely (glyph + 2 >= glyph_end)) return Glyph (); - - unsigned int coord_bytes = 0; - unsigned int coords_with_flags = 0; - while (glyph < glyph_end) - { - uint8_t flag = *glyph; - glyph++; - - unsigned int repeat = 1; - if (flag & FLAG_REPEAT) - { - if (unlikely (glyph >= glyph_end)) return Glyph (); - repeat = *glyph + 1; - glyph++; - } - - unsigned int xBytes, yBytes; - xBytes = yBytes = 0; - if (flag & FLAG_X_SHORT) xBytes = 1; - else if ((flag & FLAG_X_SAME) == 0) xBytes = 2; - - if (flag & FLAG_Y_SHORT) yBytes = 1; - else if ((flag & FLAG_Y_SAME) == 0) yBytes = 2; - - coord_bytes += (xBytes + yBytes) * repeat; - coords_with_flags += repeat; - if (coords_with_flags >= num_coordinates) break; - } - - if (unlikely (coords_with_flags != num_coordinates)) return Glyph (); - return Glyph (bytes.sub_array (0, bytes.length + coord_bytes - (glyph_end - glyph))); - } - - /* zero instruction length */ - void drop_hints () - { - GlyphHeader &glyph_header = const_cast<GlyphHeader &> (header); - (HBUINT16 &) StructAtOffset<HBUINT16> (&glyph_header, instruction_len_offset ()) = 0; - } - - void drop_hints_bytes (hb_bytes_t &dest_start, hb_bytes_t &dest_end) const - { - unsigned int instructions_len = instructions_length (); - unsigned int glyph_length = length (instructions_len); - dest_start = bytes.sub_array (0, glyph_length - instructions_len); - dest_end = bytes.sub_array (glyph_length, bytes.length - glyph_length); - } - - struct x_setter_t - { - void set (contour_point_t &point, float v) const { point.x = v; } - bool is_short (uint8_t flag) const { return flag & FLAG_X_SHORT; } - bool is_same (uint8_t flag) const { return flag & FLAG_X_SAME; } - }; - - struct y_setter_t - { - void set (contour_point_t &point, float v) const { point.y = v; } - bool is_short (uint8_t flag) const { return flag & FLAG_Y_SHORT; } - bool is_same (uint8_t flag) const { return flag & FLAG_Y_SAME; } - }; - - template <typename T> - static bool read_points (const HBUINT8 *&p /* IN/OUT */, - contour_point_vector_t &points_ /* IN/OUT */, - const hb_bytes_t &bytes) - { - T coord_setter; - float v = 0; - for (unsigned int i = 0; i < points_.length - PHANTOM_COUNT; i++) - { - uint8_t flag = points_[i].flag; - if (coord_setter.is_short (flag)) - { - if (unlikely (!bytes.in_range (p))) return false; - if (coord_setter.is_same (flag)) - v += *p++; - else - v -= *p++; - } - else - { - if (!coord_setter.is_same (flag)) - { - if (unlikely (!bytes.in_range ((const HBUINT16 *) p))) return false; - v += *(const HBINT16 *) p; - p += HBINT16::static_size; - } - } - coord_setter.set (points_[i], v); - } - return true; - } - - bool get_contour_points (contour_point_vector_t &points_ /* OUT */, - hb_vector_t<unsigned int> &end_points_ /* OUT */, - const bool phantom_only=false) const - { - const HBUINT16 *endPtsOfContours = &StructAfter<HBUINT16> (header); - int num_contours = header.numberOfContours; - if (unlikely (!bytes.in_range (&endPtsOfContours[num_contours + 1]))) return false; - unsigned int num_points = endPtsOfContours[num_contours - 1] + 1; - - points_.resize (num_points + PHANTOM_COUNT); - for (unsigned int i = 0; i < points_.length; i++) points_[i].init (); - if (phantom_only) return true; - - /* Read simple glyph points if !phantom_only */ - end_points_.resize (num_contours); - - for (int i = 0; i < num_contours; i++) - end_points_[i] = endPtsOfContours[i]; - - /* Skip instructions */ - const HBUINT8 *p = &StructAtOffset<HBUINT8> (&endPtsOfContours[num_contours + 1], - endPtsOfContours[num_contours]); - - /* Read flags */ - for (unsigned int i = 0; i < num_points; i++) - { - if (unlikely (!bytes.in_range (p))) return false; - uint8_t flag = *p++; - points_[i].flag = flag; - if (flag & FLAG_REPEAT) - { - if (unlikely (!bytes.in_range (p))) return false; - unsigned int repeat_count = *p++; - while ((repeat_count-- > 0) && (++i < num_points)) - points_[i].flag = flag; - } - } - - /* Read x & y coordinates */ - return (read_points<x_setter_t> (p, points_, bytes) && - read_points<y_setter_t> (p, points_, bytes)); - } - }; - - struct CompositeGlyph - { - const GlyphHeader &header; - hb_bytes_t bytes; - CompositeGlyph (const GlyphHeader &header_, hb_bytes_t bytes_) : - header (header_), bytes (bytes_) {} - - composite_iter_t get_iterator () const - { return composite_iter_t (bytes, &StructAfter<CompositeGlyphChain, GlyphHeader> (header)); } - - unsigned int instructions_length (hb_bytes_t bytes) const - { - unsigned int start = bytes.length; - unsigned int end = bytes.length; - const CompositeGlyphChain *last = nullptr; - for (auto &item : get_iterator ()) - last = &item; - if (unlikely (!last)) return 0; - - if ((uint16_t) last->flags & CompositeGlyphChain::WE_HAVE_INSTRUCTIONS) - start = (char *) last - &bytes + last->get_size (); - if (unlikely (start > end)) return 0; - return end - start; - } - - /* Trimming for composites not implemented. - * If removing hints it falls out of that. */ - const Glyph trim_padding () const { return Glyph (bytes); } - - /* remove WE_HAVE_INSTRUCTIONS flag from composite glyph */ - void drop_hints () - { - for (const auto &_ : get_iterator ()) - *const_cast<OT::HBUINT16 *> (&_.flags) = (uint16_t) _.flags & ~OT::glyf::CompositeGlyphChain::WE_HAVE_INSTRUCTIONS; - } - - /* Chop instructions off the end */ - void drop_hints_bytes (hb_bytes_t &dest_start) const - { dest_start = bytes.sub_array (0, bytes.length - instructions_length (bytes)); } - - bool get_contour_points (contour_point_vector_t &points_ /* OUT */, - hb_vector_t<unsigned int> &end_points_ /* OUT */, - const bool phantom_only=false) const - { - /* add one pseudo point for each component in composite glyph */ - unsigned int num_points = hb_len (get_iterator ()); - points_.resize (num_points + PHANTOM_COUNT); - for (unsigned int i = 0; i < points_.length; i++) points_[i].init (); - return true; - } - }; - - enum glyph_type_t { EMPTY, SIMPLE, COMPOSITE }; - - enum phantom_point_index_t - { - PHANTOM_LEFT = 0, - PHANTOM_RIGHT = 1, - PHANTOM_TOP = 2, - PHANTOM_BOTTOM = 3, - PHANTOM_COUNT = 4 - }; - - public: - composite_iter_t get_composite_iterator () const - { - if (type != COMPOSITE) return composite_iter_t (); - return CompositeGlyph (*header, bytes).get_iterator (); - } - - const Glyph trim_padding () const - { - switch (type) { - case COMPOSITE: return CompositeGlyph (*header, bytes).trim_padding (); - case SIMPLE: return SimpleGlyph (*header, bytes).trim_padding (); - default: return bytes; - } - } - - void drop_hints () - { - switch (type) { - case COMPOSITE: CompositeGlyph (*header, bytes).drop_hints (); return; - case SIMPLE: SimpleGlyph (*header, bytes).drop_hints (); return; - default: return; - } - } - - void drop_hints_bytes (hb_bytes_t &dest_start, hb_bytes_t &dest_end) const - { - switch (type) { - case COMPOSITE: CompositeGlyph (*header, bytes).drop_hints_bytes (dest_start); return; - case SIMPLE: SimpleGlyph (*header, bytes).drop_hints_bytes (dest_start, dest_end); return; - default: return; - } - } - - /* for a simple glyph, return contour end points, flags, along with coordinate points - * for a composite glyph, return pseudo component points - * in both cases points trailed with four phantom points - */ - bool get_contour_points (contour_point_vector_t &points_ /* OUT */, - hb_vector_t<unsigned int> &end_points_ /* OUT */, - const bool phantom_only=false) const - { - switch (type) { - case COMPOSITE: return CompositeGlyph (*header, bytes).get_contour_points (points_, end_points_, phantom_only); - case SIMPLE: return SimpleGlyph (*header, bytes).get_contour_points (points_, end_points_, phantom_only); - default: - /* empty glyph */ - points_.resize (PHANTOM_COUNT); - for (unsigned int i = 0; i < points_.length; i++) points_[i].init (); - return true; - } - } - - bool is_simple_glyph () const { return type == SIMPLE; } - bool is_composite_glyph () const { return type == COMPOSITE; } - - bool get_extents (hb_font_t *font, hb_codepoint_t gid, hb_glyph_extents_t *extents) const - { - if (type == EMPTY) return true; /* Empty glyph; zero extents. */ - return header->get_extents (font, gid, extents); - } - - hb_bytes_t get_bytes () const { return bytes; } - const GlyphHeader &get_header () const { return *header; } - - Glyph (hb_bytes_t bytes_ = hb_bytes_t ()) : - bytes (bytes_), header (bytes.as<GlyphHeader> ()) - { - int num_contours = header->numberOfContours; - if (unlikely (num_contours == 0)) type = EMPTY; - else if (num_contours > 0) type = SIMPLE; - else type = COMPOSITE; /* negative numbers */ - } - - protected: - hb_bytes_t bytes; - const GlyphHeader *header; - unsigned type; - }; - - struct accelerator_t - { - void init (hb_face_t *face_) - { - short_offset = false; - num_glyphs = 0; - loca_table = nullptr; - glyf_table = nullptr; - face = face_; - const OT::head &head = *face->table.head; - if (head.indexToLocFormat > 1 || head.glyphDataFormat > 0) - /* Unknown format. Leave num_glyphs=0, that takes care of disabling us. */ - return; - short_offset = 0 == head.indexToLocFormat; - - loca_table = hb_sanitize_context_t ().reference_table<loca> (face); - glyf_table = hb_sanitize_context_t ().reference_table<glyf> (face); - - num_glyphs = hb_max (1u, loca_table.get_length () / (short_offset ? 2 : 4)) - 1; - } - - void fini () - { - loca_table.destroy (); - glyf_table.destroy (); - } - - enum phantom_point_index_t - { - PHANTOM_LEFT = 0, - PHANTOM_RIGHT = 1, - PHANTOM_TOP = 2, - PHANTOM_BOTTOM = 3, - PHANTOM_COUNT = 4 - }; - - protected: - - void init_phantom_points (hb_codepoint_t gid, hb_array_t<contour_point_t> &phantoms /* IN/OUT */) const - { - const Glyph &glyph = glyph_for_gid (gid); - int h_delta = (int) glyph.get_header ().xMin - face->table.hmtx->get_side_bearing (gid); - int v_orig = (int) glyph.get_header ().yMax + face->table.vmtx->get_side_bearing (gid); - unsigned int h_adv = face->table.hmtx->get_advance (gid); - unsigned int v_adv = face->table.vmtx->get_advance (gid); - - phantoms[PHANTOM_LEFT].x = h_delta; - phantoms[PHANTOM_RIGHT].x = h_adv + h_delta; - phantoms[PHANTOM_TOP].y = v_orig; - phantoms[PHANTOM_BOTTOM].y = v_orig - (int) v_adv; - } - - struct contour_bounds_t - { - contour_bounds_t () { min_x = min_y = FLT_MAX; max_x = max_y = -FLT_MAX; } - - void add (const contour_point_t &p) - { - min_x = hb_min (min_x, p.x); - min_y = hb_min (min_y, p.y); - max_x = hb_max (max_x, p.x); - max_y = hb_max (max_y, p.y); - } - - bool empty () const { return (min_x >= max_x) || (min_y >= max_y); } - - void get_extents (hb_font_t *font, hb_glyph_extents_t *extents) - { - if (unlikely (empty ())) - { - extents->width = 0; - extents->x_bearing = 0; - extents->height = 0; - extents->y_bearing = 0; - return; - } - extents->x_bearing = font->em_scalef_x (min_x); - extents->width = font->em_scalef_x (max_x - min_x); - extents->y_bearing = font->em_scalef_y (max_y); - extents->height = font->em_scalef_y (min_y - max_y); - } - - protected: - float min_x, min_y, max_x, max_y; - }; - -#ifndef HB_NO_VAR - /* Note: Recursively calls itself. - * all_points includes phantom points - */ - bool get_points_var (hb_codepoint_t gid, - const int *coords, unsigned int coord_count, - contour_point_vector_t &all_points /* OUT */, - unsigned int depth = 0) const - { - if (unlikely (depth++ > HB_MAX_NESTING_LEVEL)) return false; - contour_point_vector_t points; - hb_vector_t<unsigned int> end_points; - const Glyph &glyph = glyph_for_gid (gid); - if (unlikely (!glyph.get_contour_points (points, end_points))) return false; - hb_array_t<contour_point_t> phantoms = points.sub_array (points.length - PHANTOM_COUNT, PHANTOM_COUNT); - init_phantom_points (gid, phantoms); - if (unlikely (!face->table.gvar->apply_deltas_to_points (gid, coords, coord_count, points.as_array (), end_points.as_array ()))) return false; - - unsigned int comp_index = 0; - if (glyph.is_simple_glyph ()) - all_points.extend (points.as_array ()); - else if (glyph.is_composite_glyph ()) - { - for (auto &item : glyph.get_composite_iterator ()) - { - contour_point_vector_t comp_points; - if (unlikely (!get_points_var (item.glyphIndex, coords, coord_count, - comp_points, depth)) - || comp_points.length < PHANTOM_COUNT) - return false; - - /* Copy phantom points from component if USE_MY_METRICS flag set */ - if (item.is_use_my_metrics ()) - for (unsigned int i = 0; i < PHANTOM_COUNT; i++) - phantoms[i] = comp_points[comp_points.length - PHANTOM_COUNT + i]; - - /* Apply component transformation & translation */ - item.transform_points (comp_points); - - /* Apply translatation from gvar */ - comp_points.translate (points[comp_index]); - - if (item.is_anchored ()) - { - unsigned int p1, p2; - item.get_anchor_points (p1, p2); - if (likely (p1 < all_points.length && p2 < comp_points.length)) - { - contour_point_t delta; - delta.init (all_points[p1].x - comp_points[p2].x, - all_points[p1].y - comp_points[p2].y); - - comp_points.translate (delta); - } - } - - all_points.extend (comp_points.sub_array (0, comp_points.length - PHANTOM_COUNT)); - - comp_index++; - } - - all_points.extend (phantoms); - } - else return false; - - return true; - } - - bool get_points_bearing_applied (hb_font_t *font, hb_codepoint_t gid, contour_point_vector_t &all_points) const - { - if (unlikely (!get_points_var (gid, font->coords, font->num_coords, all_points) || - all_points.length < PHANTOM_COUNT)) return false; - - /* Undocumented rasterizer behavior: - * Shift points horizontally by the updated left side bearing - */ - contour_point_t delta; - delta.init (-all_points[all_points.length - PHANTOM_COUNT + PHANTOM_LEFT].x, 0.f); - if (delta.x) all_points.translate (delta); - return true; - } - - protected: - - bool get_var_extents_and_phantoms (hb_font_t *font, hb_codepoint_t gid, - hb_glyph_extents_t *extents=nullptr /* OUT */, - contour_point_vector_t *phantoms=nullptr /* OUT */) const - { - contour_point_vector_t all_points; - if (!unlikely (get_points_bearing_applied (font, gid, all_points))) return false; - if (extents) - { - contour_bounds_t bounds; - for (unsigned int i = 0; i + PHANTOM_COUNT < all_points.length; i++) - bounds.add (all_points[i]); - bounds.get_extents (font, extents); - } - if (phantoms) - for (unsigned int i = 0; i < PHANTOM_COUNT; i++) - (*phantoms)[i] = all_points[all_points.length - PHANTOM_COUNT + i]; - return true; - } - - bool get_var_metrics (hb_font_t *font, hb_codepoint_t gid, - contour_point_vector_t &phantoms) const - { return get_var_extents_and_phantoms (font, gid, nullptr, &phantoms); } - - bool get_extents_var (hb_font_t *font, hb_codepoint_t gid, - hb_glyph_extents_t *extents) const - { return get_var_extents_and_phantoms (font, gid, extents); } -#endif - - public: -#ifndef HB_NO_VAR - unsigned int get_advance_var (hb_font_t *font, hb_codepoint_t gid, - bool is_vertical) const - { - bool success = false; - contour_point_vector_t phantoms; - phantoms.resize (PHANTOM_COUNT); - - if (likely (font->num_coords == face->table.gvar->get_axis_count ())) - success = get_var_metrics (font, gid, phantoms); - - if (unlikely (!success)) - return is_vertical ? face->table.vmtx->get_advance (gid) : face->table.hmtx->get_advance (gid); - - if (is_vertical) - return roundf (phantoms[PHANTOM_TOP].y - phantoms[PHANTOM_BOTTOM].y); - else - return roundf (phantoms[PHANTOM_RIGHT].x - phantoms[PHANTOM_LEFT].x); - } - - int get_side_bearing_var (hb_font_t *font, hb_codepoint_t gid, bool is_vertical) const - { - hb_glyph_extents_t extents; - contour_point_vector_t phantoms; - phantoms.resize (PHANTOM_COUNT); - - if (unlikely (!get_var_extents_and_phantoms (font, gid, &extents, &phantoms))) - return is_vertical ? face->table.vmtx->get_side_bearing (gid) : face->table.hmtx->get_side_bearing (gid); - - return is_vertical ? ceil (phantoms[PHANTOM_TOP].y) - extents.y_bearing : floor (phantoms[PHANTOM_LEFT].x); - } -#endif - - bool get_extents (hb_font_t *font, hb_codepoint_t gid, hb_glyph_extents_t *extents) const - { -#ifndef HB_NO_VAR - unsigned int coord_count; - const int *coords = hb_font_get_var_coords_normalized (font, &coord_count); - if (coords && coord_count > 0 && coord_count == face->table.gvar->get_axis_count ()) - return get_extents_var (font, gid, extents); -#endif - - if (unlikely (gid >= num_glyphs)) return false; - - return glyph_for_gid (gid).get_extents (font, gid, extents); - } - - const Glyph - glyph_for_gid (hb_codepoint_t gid, bool needs_padding_removal = false) const - { - unsigned int start_offset, end_offset; - if (unlikely (gid >= num_glyphs)) return Glyph (); - - if (short_offset) - { - const HBUINT16 *offsets = (const HBUINT16 *) loca_table->dataZ.arrayZ; - start_offset = 2 * offsets[gid]; - end_offset = 2 * offsets[gid + 1]; - } - else - { - const HBUINT32 *offsets = (const HBUINT32 *) loca_table->dataZ.arrayZ; - start_offset = offsets[gid]; - end_offset = offsets[gid + 1]; - } - - if (unlikely (start_offset > end_offset || end_offset > glyf_table.get_length ())) - return Glyph (); - - Glyph glyph (hb_bytes_t ((const char *) this->glyf_table + start_offset, - end_offset - start_offset)); - return needs_padding_removal ? glyph.trim_padding () : glyph; - } - - void - add_gid_and_children (hb_codepoint_t gid, hb_set_t *gids_to_retain, - unsigned int depth = 0) const - { - if (unlikely (depth++ > HB_MAX_NESTING_LEVEL)) return; - /* Check if is already visited */ - if (gids_to_retain->has (gid)) return; - - gids_to_retain->add (gid); - - for (auto &item : glyph_for_gid (gid).get_composite_iterator ()) - add_gid_and_children (item.glyphIndex, gids_to_retain, depth); - } - - private: - bool short_offset; - unsigned int num_glyphs; - hb_blob_ptr_t<loca> loca_table; - hb_blob_ptr_t<glyf> glyf_table; - hb_face_t *face; - }; - - struct SubsetGlyph - { - hb_codepoint_t new_gid; - hb_codepoint_t old_gid; - Glyph source_glyph; - hb_bytes_t dest_start; /* region of source_glyph to copy first */ - hb_bytes_t dest_end; /* region of source_glyph to copy second */ - - bool serialize (hb_serialize_context_t *c, - const hb_subset_plan_t *plan) const - { - TRACE_SERIALIZE (this); - - hb_bytes_t dest_glyph = dest_start.copy (c); - dest_glyph = hb_bytes_t (&dest_glyph, dest_glyph.length + dest_end.copy (c).length); - unsigned int pad_length = padding (); - DEBUG_MSG (SUBSET, nullptr, "serialize %d byte glyph, width %d pad %d", dest_glyph.length, dest_glyph.length + pad_length, pad_length); - - HBUINT8 pad; - pad = 0; - while (pad_length > 0) - { - c->embed (pad); - pad_length--; - } - - if (!unlikely (dest_glyph.length)) return_trace (true); - - /* update components gids */ - for (auto &_ : Glyph (dest_glyph).get_composite_iterator ()) - { - hb_codepoint_t new_gid; - if (plan->new_gid_for_old_gid (_.glyphIndex, &new_gid)) - ((OT::glyf::CompositeGlyphChain *) &_)->glyphIndex = new_gid; - } - - if (plan->drop_hints) Glyph (dest_glyph).drop_hints (); - - return_trace (true); - } - - void drop_hints_bytes () - { source_glyph.drop_hints_bytes (dest_start, dest_end); } - - unsigned int length () const { return dest_start.length + dest_end.length; } - /* pad to 2 to ensure 2-byte loca will be ok */ - unsigned int padding () const { return length () % 2; } - unsigned int padded_size () const { return length () + padding (); } - }; - - protected: - UnsizedArrayOf<HBUINT8> - dataZ; /* Glyphs data. */ - public: - DEFINE_SIZE_MIN (0); /* In reality, this is UNBOUNDED() type; but since we always - * check the size externally, allow Null() object of it by - * defining it _MIN instead. */ -}; - -struct glyf_accelerator_t : glyf::accelerator_t {}; - -} /* namespace OT */ - +#include "OT/glyf/glyf.hh" #endif /* HB_OT_GLYF_TABLE_HH */ |