[glyf] Move subset related methods inside GlyphHeader
This commit is contained in:
Ebrahim Byagowi
parent
7839e23558
commit
ad86806dcb
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@ -208,46 +208,6 @@ struct glyf
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glyf.fini ();
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}
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static void
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_fix_component_gids (const hb_subset_plan_t *plan,
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hb_bytes_t glyph)
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{
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for (auto &item : OT::glyf::get_composite_iterator (glyph))
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{
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hb_codepoint_t new_gid;
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if (plan->new_gid_for_old_gid (item.glyphIndex, &new_gid))
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((OT::glyf::CompositeGlyphHeader *) &item)->glyphIndex = new_gid;
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}
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}
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static void
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_zero_instruction_length (hb_bytes_t glyph)
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{
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const GlyphHeader &glyph_header = *glyph.as<GlyphHeader> ();
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if (!glyph_header.is_simple_glyph ()) return; // only for simple glyphs
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unsigned int instruction_len_offset = glyph_header.as_simple ().instruction_len_offset ();
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const HBUINT16 &instruction_len = StructAtOffset<HBUINT16> (&glyph, instruction_len_offset);
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(HBUINT16 &) instruction_len = 0;
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}
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static bool _remove_composite_instruction_flag (hb_bytes_t glyph)
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{
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const GlyphHeader &glyph_header = *glyph.as<GlyphHeader> ();
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if (!glyph_header.is_composite_glyph ()) return true; // only for composites
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/* remove WE_HAVE_INSTRUCTIONS from flags in dest */
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return
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+ OT::glyf::get_composite_iterator (glyph)
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| hb_reduce ([] (bool _, const OT::glyf::CompositeGlyphHeader &item)
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{
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OT::HBUINT16 *flags = const_cast<OT::HBUINT16 *> (&item.flags);
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*flags = (uint16_t) *flags & ~OT::glyf::CompositeGlyphHeader::WE_HAVE_INSTRUCTIONS;
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return true;
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}, false)
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;
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}
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static bool
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_add_head_and_set_loca_version (hb_subset_plan_t *plan, bool use_short_loca)
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{
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@ -266,169 +226,6 @@ struct glyf
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return success;
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}
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struct GlyphHeader
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{
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struct SimpleHeader
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{
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const GlyphHeader &header;
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SimpleHeader (const GlyphHeader &header_) : header (header_) {}
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unsigned int instruction_len_offset () const
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{ return static_size + 2 * header.numberOfContours; }
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unsigned int length (unsigned int instruction_len) const
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{ return instruction_len_offset () + 2 + instruction_len; }
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bool get_instruction_length (hb_bytes_t glyph, unsigned int *len) const
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{
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unsigned int instruction_length_offset = instruction_len_offset ();
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if (unlikely (instruction_length_offset + 2 > glyph.length)) return false;
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const HBUINT16 &instruction_len = StructAtOffset<HBUINT16> (&glyph, instruction_length_offset);
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/* Out of bounds of the current glyph */
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if (unlikely (length (instruction_len) > glyph.length)) return false;
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*len = instruction_len;
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return true;
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}
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enum simple_glyph_flag_t
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{
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FLAG_ON_CURVE = 0x01,
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FLAG_X_SHORT = 0x02,
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FLAG_Y_SHORT = 0x04,
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FLAG_REPEAT = 0x08,
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FLAG_X_SAME = 0x10,
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FLAG_Y_SAME = 0x20,
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FLAG_RESERVED1 = 0x40,
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FLAG_RESERVED2 = 0x80
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};
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hb_bytes_t bytes_without_padding (hb_bytes_t glyph_bytes) const
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{
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/* based on FontTools _g_l_y_f.py::trim */
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const char *glyph = glyph_bytes.arrayZ;
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const char *glyph_end = glyph + glyph_bytes.length;
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/* simple glyph w/contours, possibly trimmable */
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glyph += instruction_len_offset ();
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if (unlikely (glyph + 2 >= glyph_end)) return hb_bytes_t ();
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unsigned int num_coordinates = StructAtOffset<HBUINT16> (glyph - 2, 0) + 1;
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unsigned int num_instructions = StructAtOffset<HBUINT16> (glyph, 0);
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glyph += 2 + num_instructions;
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if (unlikely (glyph + 2 >= glyph_end)) return hb_bytes_t ();
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unsigned int coord_bytes = 0;
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unsigned int coords_with_flags = 0;
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while (glyph < glyph_end)
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{
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uint8_t flag = *glyph;
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glyph++;
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unsigned int repeat = 1;
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if (flag & FLAG_REPEAT)
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{
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if (unlikely (glyph >= glyph_end)) return hb_bytes_t ();
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repeat = *glyph + 1;
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glyph++;
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}
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unsigned int xBytes, yBytes;
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xBytes = yBytes = 0;
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if (flag & FLAG_X_SHORT) xBytes = 1;
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else if ((flag & FLAG_X_SAME) == 0) xBytes = 2;
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if (flag & FLAG_Y_SHORT) yBytes = 1;
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else if ((flag & FLAG_Y_SAME) == 0) yBytes = 2;
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coord_bytes += (xBytes + yBytes) * repeat;
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coords_with_flags += repeat;
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if (coords_with_flags >= num_coordinates) break;
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}
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if (unlikely (coords_with_flags != num_coordinates)) return hb_bytes_t ();
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return glyph_bytes.sub_array (0, glyph_bytes.length + coord_bytes - (glyph_end - glyph));
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}
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};
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struct CompositeHeader
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{
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const GlyphHeader &header;
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CompositeHeader (const GlyphHeader &header_) : header (header_) {}
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bool get_instruction_length (hb_bytes_t glyph, unsigned int *length) const
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{
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unsigned int start = glyph.length;
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unsigned int end = glyph.length;
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const CompositeGlyphHeader *last = nullptr;
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for (auto &item : get_composite_iterator (glyph))
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last = &item;
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if (unlikely (!last)) return false;
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if ((uint16_t) last->flags & CompositeGlyphHeader::WE_HAVE_INSTRUCTIONS)
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start = (char *) last - &glyph + last->get_size ();
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if (unlikely (start > end)) return false;
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*length = end - start;
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return true;
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}
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/* Trimming for composites not implemented.
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* If removing hints it falls out of that. */
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hb_bytes_t bytes_without_padding (hb_bytes_t glyph_bytes) const
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{ return glyph_bytes; }
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};
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const SimpleHeader as_simple () const { return SimpleHeader (*this); }
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const CompositeHeader as_composite () const { return CompositeHeader (*this); }
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enum glyph_type_t { EMPTY, SIMPLE, COMPOSITE };
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glyph_type_t get_type () const
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{
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if (is_simple_glyph ()) return SIMPLE;
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else if (is_composite_glyph ()) return COMPOSITE;
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else return EMPTY;
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}
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bool get_instruction_length (hb_bytes_t glyph, unsigned int *length) const
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{
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switch (get_type ())
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{
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case COMPOSITE: return as_composite ().get_instruction_length (glyph, length);
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case SIMPLE: return as_simple ().get_instruction_length (glyph, length);
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default:
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case EMPTY: *length = 0; return glyph.length == 0; /* only 0 byte glyphs are healthy when missing GlyphHeader */
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}
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}
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hb_bytes_t bytes_without_padding (hb_bytes_t glyph_bytes) const
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{
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switch (get_type ())
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{
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case COMPOSITE: return as_composite ().bytes_without_padding (glyph_bytes);
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case SIMPLE: return as_simple ().bytes_without_padding (glyph_bytes);
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default:
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case EMPTY: return glyph_bytes;
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}
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}
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bool has_data () const { return numberOfContours; }
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bool is_simple_glyph () const { return numberOfContours > 0; }
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bool is_composite_glyph () const { return numberOfContours < 0; }
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HBINT16 numberOfContours;
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/* If the number of contours is
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* greater than or equal to zero,
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* this is a simple glyph; if negative,
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* this is a composite glyph. */
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FWORD xMin; /* Minimum x for coordinate data. */
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FWORD yMin; /* Minimum y for coordinate data. */
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FWORD xMax; /* Maximum x for coordinate data. */
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FWORD yMax; /* Maximum y for coordinate data. */
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DEFINE_SIZE_STATIC (10);
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};
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struct CompositeGlyphHeader
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{
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enum composite_glyph_flag_t
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@ -591,13 +388,207 @@ struct glyf
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__item_t__ current;
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};
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static composite_iter_t get_composite_iterator (hb_bytes_t glyph)
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struct GlyphHeader
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{
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const GlyphHeader &glyph_header = *glyph.as<GlyphHeader> ();
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if (!glyph_header.is_composite_glyph ()) return composite_iter_t ();
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struct SimpleHeader
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{
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const GlyphHeader &header;
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SimpleHeader (const GlyphHeader &header_) : header (header_) {}
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return composite_iter_t (glyph, &StructAfter<CompositeGlyphHeader, GlyphHeader> (glyph_header));
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}
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unsigned int instruction_len_offset () const
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{ return static_size + 2 * header.numberOfContours; }
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unsigned int length (unsigned int instruction_len) const
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{ return instruction_len_offset () + 2 + instruction_len; }
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bool get_instruction_length (hb_bytes_t glyph, unsigned int *len) const
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{
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unsigned int instruction_length_offset = instruction_len_offset ();
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if (unlikely (instruction_length_offset + 2 > glyph.length)) return false;
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const HBUINT16 &instructionLength = StructAtOffset<HBUINT16> (&glyph, instruction_length_offset);
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/* Out of bounds of the current glyph */
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if (unlikely (length (instructionLength) > glyph.length)) return false;
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*len = instructionLength;
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return true;
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}
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enum simple_glyph_flag_t
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{
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FLAG_ON_CURVE = 0x01,
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FLAG_X_SHORT = 0x02,
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FLAG_Y_SHORT = 0x04,
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FLAG_REPEAT = 0x08,
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FLAG_X_SAME = 0x10,
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FLAG_Y_SAME = 0x20,
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FLAG_RESERVED1 = 0x40,
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FLAG_RESERVED2 = 0x80
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};
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hb_bytes_t bytes_without_padding (hb_bytes_t glyph_bytes) const
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{
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/* based on FontTools _g_l_y_f.py::trim */
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const char *glyph = glyph_bytes.arrayZ;
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const char *glyph_end = glyph + glyph_bytes.length;
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/* simple glyph w/contours, possibly trimmable */
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glyph += instruction_len_offset ();
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if (unlikely (glyph + 2 >= glyph_end)) return hb_bytes_t ();
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unsigned int num_coordinates = StructAtOffset<HBUINT16> (glyph - 2, 0) + 1;
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unsigned int num_instructions = StructAtOffset<HBUINT16> (glyph, 0);
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glyph += 2 + num_instructions;
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if (unlikely (glyph + 2 >= glyph_end)) return hb_bytes_t ();
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unsigned int coord_bytes = 0;
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unsigned int coords_with_flags = 0;
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while (glyph < glyph_end)
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{
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uint8_t flag = *glyph;
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glyph++;
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unsigned int repeat = 1;
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if (flag & FLAG_REPEAT)
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{
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if (unlikely (glyph >= glyph_end)) return hb_bytes_t ();
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repeat = *glyph + 1;
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glyph++;
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}
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unsigned int xBytes, yBytes;
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xBytes = yBytes = 0;
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if (flag & FLAG_X_SHORT) xBytes = 1;
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else if ((flag & FLAG_X_SAME) == 0) xBytes = 2;
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if (flag & FLAG_Y_SHORT) yBytes = 1;
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else if ((flag & FLAG_Y_SAME) == 0) yBytes = 2;
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coord_bytes += (xBytes + yBytes) * repeat;
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coords_with_flags += repeat;
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if (coords_with_flags >= num_coordinates) break;
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}
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if (unlikely (coords_with_flags != num_coordinates)) return hb_bytes_t ();
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return glyph_bytes.sub_array (0, glyph_bytes.length + coord_bytes - (glyph_end - glyph));
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}
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/* zero instruction length */
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void drop_hints ()
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{
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GlyphHeader &glyph_header = const_cast<GlyphHeader &> (header);
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(HBUINT16 &) StructAtOffset<HBUINT16> (&glyph_header, instruction_len_offset ()) = 0;
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}
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};
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struct CompositeHeader
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{
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const GlyphHeader &header;
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CompositeHeader (const GlyphHeader &header_) : header (header_) {}
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composite_iter_t get_iterator (hb_bytes_t glyph) const
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{ return composite_iter_t (glyph, &StructAfter<CompositeGlyphHeader, GlyphHeader> (header)); }
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bool get_instruction_length (hb_bytes_t glyph, unsigned int *length) const
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{
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unsigned int start = glyph.length;
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unsigned int end = glyph.length;
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const CompositeGlyphHeader *last = nullptr;
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for (auto &item : get_iterator (glyph))
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last = &item;
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if (unlikely (!last)) return false;
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if ((uint16_t) last->flags & CompositeGlyphHeader::WE_HAVE_INSTRUCTIONS)
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start = (char *) last - &glyph + last->get_size ();
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if (unlikely (start > end)) return false;
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*length = end - start;
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return true;
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}
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/* Trimming for composites not implemented.
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* If removing hints it falls out of that. */
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hb_bytes_t bytes_without_padding (hb_bytes_t glyph_bytes) const
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{ return glyph_bytes; }
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/* remove WE_HAVE_INSTRUCTIONS flag from composite glyph */
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void drop_hints (hb_bytes_t glyph_bytes)
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{
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for (const auto &_ : get_iterator (glyph_bytes))
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{
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HBUINT16 &flags = *const_cast<OT::HBUINT16 *> (&_.flags);
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flags = (uint16_t) flags & ~OT::glyf::CompositeGlyphHeader::WE_HAVE_INSTRUCTIONS;
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}
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}
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};
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const SimpleHeader as_simple () const { return SimpleHeader (*this); }
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SimpleHeader as_simple () { return SimpleHeader (*this); }
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const CompositeHeader as_composite () const { return CompositeHeader (*this); }
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CompositeHeader as_composite () { return CompositeHeader (*this); }
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enum glyph_type_t { EMPTY, SIMPLE, COMPOSITE };
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glyph_type_t get_type () const
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{
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if (is_simple_glyph ()) return SIMPLE;
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else if (is_composite_glyph ()) return COMPOSITE;
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else return EMPTY;
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}
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composite_iter_t get_composite_iterator (hb_bytes_t glyph) const
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{
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if (!is_composite_glyph ()) return composite_iter_t ();
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return as_composite ().get_iterator (glyph);
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}
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bool get_instruction_length (hb_bytes_t glyph, unsigned int *length) const
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{
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switch (get_type ())
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{
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case COMPOSITE: return as_composite ().get_instruction_length (glyph, length);
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case SIMPLE: return as_simple ().get_instruction_length (glyph, length);
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default:
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case EMPTY: *length = 0; return glyph.length == 0; /* only 0 byte glyphs are healthy when missing GlyphHeader */
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}
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}
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hb_bytes_t bytes_without_padding (hb_bytes_t glyph_bytes) const
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{
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switch (get_type ())
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{
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case COMPOSITE: return as_composite ().bytes_without_padding (glyph_bytes);
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case SIMPLE: return as_simple ().bytes_without_padding (glyph_bytes);
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default:
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case EMPTY: return glyph_bytes;
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}
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}
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void drop_hints (hb_bytes_t glyph_bytes)
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{
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switch (get_type ())
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{
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case COMPOSITE: as_composite ().drop_hints (glyph_bytes); return;
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case SIMPLE: as_simple ().drop_hints (); return;
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default:
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case EMPTY: return;
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}
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}
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bool has_data () const { return numberOfContours; }
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bool is_simple_glyph () const { return numberOfContours > 0; }
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bool is_composite_glyph () const { return numberOfContours < 0; }
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HBINT16 numberOfContours;
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/* If the number of contours is
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* greater than or equal to zero,
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* this is a simple glyph; if negative,
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* this is a composite glyph. */
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FWORD xMin; /* Minimum x for coordinate data. */
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FWORD yMin; /* Minimum y for coordinate data. */
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FWORD xMax; /* Maximum x for coordinate data. */
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FWORD yMax; /* Maximum y for coordinate data. */
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DEFINE_SIZE_STATIC (10);
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};
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struct accelerator_t
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{
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@ -723,7 +714,7 @@ struct glyf
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if (glyph_header.is_composite_glyph ())
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{
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/* add one pseudo point for each component in composite glyph */
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num_points += hb_len (get_composite_iterator (bytes));
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num_points += hb_len (glyph_header.get_composite_iterator (bytes));
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points_.resize (num_points + PHANTOM_COUNT);
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for (unsigned int i = 0; i < points_.length; i++) points_[i].init ();
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return true;
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@ -821,7 +812,7 @@ struct glyf
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all_points.extend (points.as_array ());
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else if (glyph_header.is_composite_glyph ())
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{
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for (auto &item : get_composite_iterator (bytes))
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for (auto &item : glyph_header.get_composite_iterator (bytes))
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{
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contour_point_vector_t comp_points;
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if (unlikely (!get_points_var (item.glyphIndex, coords, coord_count,
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@ -1051,16 +1042,19 @@ struct glyf
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pad_length--;
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}
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if (dest_glyph.length)
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if (!unlikely (dest_glyph.length)) return_trace (true);
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/* update components gids */
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GlyphHeader &glyph_header = *const_cast<GlyphHeader *> (dest_glyph.as<GlyphHeader> ());
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for (auto &_ : glyph_header.get_composite_iterator (dest_glyph))
|
||||
{
|
||||
_fix_component_gids (plan, dest_glyph);
|
||||
if (plan->drop_hints)
|
||||
{
|
||||
_zero_instruction_length (dest_glyph);
|
||||
c->check_success (_remove_composite_instruction_flag (dest_glyph));
|
||||
}
|
||||
hb_codepoint_t new_gid;
|
||||
if (plan->new_gid_for_old_gid (_.glyphIndex, &new_gid))
|
||||
((OT::glyf::CompositeGlyphHeader *) &_)->glyphIndex = new_gid;
|
||||
}
|
||||
|
||||
if (plan->drop_hints) glyph_header.drop_hints (dest_glyph);
|
||||
|
||||
return_trace (true);
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -45,7 +45,9 @@ _add_gid_and_children (const OT::glyf::accelerator_t &glyf,
|
|||
|
||||
hb_set_add (gids_to_retain, gid);
|
||||
|
||||
for (auto &item : OT::glyf::get_composite_iterator (glyf.bytes_for_glyph (gid)))
|
||||
hb_bytes_t glyph_bytes = glyf.bytes_for_glyph (gid);
|
||||
const OT::glyf::GlyphHeader &glyph_header = *glyph_bytes.as<OT::glyf::GlyphHeader> ();
|
||||
for (auto &item : glyph_header.get_composite_iterator (glyph_bytes))
|
||||
_add_gid_and_children (glyf, item.glyphIndex, gids_to_retain);
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue