diff options
Diffstat (limited to 'thirdparty/harfbuzz/src/OT/glyf/CompositeGlyph.hh')
| -rw-r--r-- | thirdparty/harfbuzz/src/OT/glyf/CompositeGlyph.hh | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/thirdparty/harfbuzz/src/OT/glyf/CompositeGlyph.hh b/thirdparty/harfbuzz/src/OT/glyf/CompositeGlyph.hh new file mode 100644 index 0000000000..c145beaa49 --- /dev/null +++ b/thirdparty/harfbuzz/src/OT/glyf/CompositeGlyph.hh @@ -0,0 +1,258 @@ +#ifndef OT_GLYF_COMPOSITEGLYPH_HH +#define OT_GLYF_COMPOSITEGLYPH_HH + + +#include "../../hb-open-type.hh" + + +namespace OT { +namespace glyf_impl { + + +struct CompositeGlyphRecord +{ + protected: + 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 + }; + + public: + 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; + } + + void drop_instructions_flag () { flags = (uint16_t) flags & ~WE_HAVE_INSTRUCTIONS; } + void set_overlaps_flag () + { + flags = (uint16_t) flags | OVERLAP_COMPOUND; + } + + bool has_instructions () const { return flags & WE_HAVE_INSTRUCTIONS; } + + bool has_more () const { return flags & MORE_COMPONENTS; } + 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; + HBGlyphID16 glyphIndex; + public: + DEFINE_SIZE_MIN (4); +}; + +struct composite_iter_t : hb_iter_with_fallback_t<composite_iter_t, const CompositeGlyphRecord &> +{ + typedef const CompositeGlyphRecord *__item_t__; + composite_iter_t (hb_bytes_t glyph_, __item_t__ current_) : + glyph (glyph_), current (nullptr), current_size (0) + { + set_current (current_); + } + + composite_iter_t () : glyph (hb_bytes_t ()), current (nullptr), current_size (0) {} + + item_t __item__ () const { return *current; } + bool __more__ () const { return current; } + void __next__ () + { + if (!current->has_more ()) { current = nullptr; return; } + + set_current (&StructAtOffset<CompositeGlyphRecord> (current, current_size)); + } + composite_iter_t __end__ () const { return composite_iter_t (); } + bool operator != (const composite_iter_t& o) const + { return current != o.current; } + + + void set_current (__item_t__ current_) + { + if (!glyph.check_range (current_, CompositeGlyphRecord::min_size)) + { + current = nullptr; + current_size = 0; + return; + } + unsigned size = current_->get_size (); + if (!glyph.check_range (current_, size)) + { + current = nullptr; + current_size = 0; + return; + } + + current = current_; + current_size = size; + } + + private: + hb_bytes_t glyph; + __item_t__ current; + unsigned current_size; +}; + +struct CompositeGlyph +{ + const GlyphHeader &header; + hb_bytes_t bytes; + CompositeGlyph (const GlyphHeader &header_, hb_bytes_t bytes_) : + header (header_), bytes (bytes_) {} + + composite_iter_t iter () const + { return composite_iter_t (bytes, &StructAfter<CompositeGlyphRecord, GlyphHeader> (header)); } + + unsigned int instructions_length (hb_bytes_t bytes) const + { + unsigned int start = bytes.length; + unsigned int end = bytes.length; + const CompositeGlyphRecord *last = nullptr; + for (auto &item : iter ()) + last = &item; + if (unlikely (!last)) return 0; + + if (last->has_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 hb_bytes_t trim_padding () const { return bytes; } + + void drop_hints () + { + for (const auto &_ : iter ()) + const_cast<CompositeGlyphRecord &> (_).drop_instructions_flag (); + } + + /* 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)); } + + void set_overlaps_flag () + { + CompositeGlyphRecord& glyph_chain = const_cast<CompositeGlyphRecord &> ( + StructAfter<CompositeGlyphRecord, GlyphHeader> (header)); + if (!bytes.check_range(&glyph_chain, CompositeGlyphRecord::min_size)) + return; + glyph_chain.set_overlaps_flag (); + } +}; + + +} /* namespace glyf_impl */ +} /* namespace OT */ + + +#endif /* OT_GLYF_COMPOSITEGLYPH_HH */ |