2022-06-26 00:38:50 +02:00
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#ifndef OT_GLYF_GLYPH_HH
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#define OT_GLYF_GLYPH_HH
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2022-06-26 01:05:18 +02:00
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#include "../../hb-open-type.hh"
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2022-06-26 00:38:50 +02:00
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2022-06-26 01:53:13 +02:00
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#include "GlyphHeader.hh"
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2022-06-26 01:55:16 +02:00
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#include "SimpleGlyph.hh"
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2022-06-26 01:53:13 +02:00
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2022-06-26 00:38:50 +02:00
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namespace OT {
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struct glyf_accelerator_t;
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2022-06-26 01:50:44 +02:00
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namespace glyf_impl {
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2022-06-26 00:38:50 +02:00
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struct CompositeGlyphChain
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{
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protected:
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enum composite_glyph_flag_t
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{
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ARG_1_AND_2_ARE_WORDS = 0x0001,
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2022-06-26 01:37:59 +02:00
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ARGS_ARE_XY_VALUES = 0x0002,
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2022-06-26 00:38:50 +02:00
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ROUND_XY_TO_GRID = 0x0004,
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WE_HAVE_A_SCALE = 0x0008,
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MORE_COMPONENTS = 0x0020,
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WE_HAVE_AN_X_AND_Y_SCALE = 0x0040,
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WE_HAVE_A_TWO_BY_TWO = 0x0080,
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WE_HAVE_INSTRUCTIONS = 0x0100,
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USE_MY_METRICS = 0x0200,
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OVERLAP_COMPOUND = 0x0400,
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SCALED_COMPONENT_OFFSET = 0x0800,
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UNSCALED_COMPONENT_OFFSET = 0x1000
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};
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public:
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unsigned int get_size () const
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{
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unsigned int size = min_size;
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/* arg1 and 2 are int16 */
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if (flags & ARG_1_AND_2_ARE_WORDS) size += 4;
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/* arg1 and 2 are int8 */
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else size += 2;
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/* One x 16 bit (scale) */
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if (flags & WE_HAVE_A_SCALE) size += 2;
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/* Two x 16 bit (xscale, yscale) */
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else if (flags & WE_HAVE_AN_X_AND_Y_SCALE) size += 4;
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/* Four x 16 bit (xscale, scale01, scale10, yscale) */
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else if (flags & WE_HAVE_A_TWO_BY_TWO) size += 8;
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return size;
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}
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void set_glyph_index (hb_codepoint_t new_gid) { glyphIndex = new_gid; }
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hb_codepoint_t get_glyph_index () const { return glyphIndex; }
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void drop_instructions_flag () { flags = (uint16_t) flags & ~WE_HAVE_INSTRUCTIONS; }
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void set_overlaps_flag ()
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{
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flags = (uint16_t) flags | OVERLAP_COMPOUND;
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}
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bool has_instructions () const { return flags & WE_HAVE_INSTRUCTIONS; }
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bool has_more () const { return flags & MORE_COMPONENTS; }
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bool is_use_my_metrics () const { return flags & USE_MY_METRICS; }
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bool is_anchored () const { return !(flags & ARGS_ARE_XY_VALUES); }
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void get_anchor_points (unsigned int &point1, unsigned int &point2) const
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{
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const HBUINT8 *p = &StructAfter<const HBUINT8> (glyphIndex);
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if (flags & ARG_1_AND_2_ARE_WORDS)
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{
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point1 = ((const HBUINT16 *) p)[0];
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point2 = ((const HBUINT16 *) p)[1];
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}
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else
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{
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point1 = p[0];
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point2 = p[1];
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}
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}
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void transform_points (contour_point_vector_t &points) const
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{
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float matrix[4];
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contour_point_t trans;
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if (get_transformation (matrix, trans))
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{
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if (scaled_offsets ())
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{
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points.translate (trans);
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points.transform (matrix);
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}
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else
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{
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points.transform (matrix);
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points.translate (trans);
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}
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}
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}
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protected:
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bool scaled_offsets () const
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{ return (flags & (SCALED_COMPONENT_OFFSET | UNSCALED_COMPONENT_OFFSET)) == SCALED_COMPONENT_OFFSET; }
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bool get_transformation (float (&matrix)[4], contour_point_t &trans) const
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{
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matrix[0] = matrix[3] = 1.f;
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matrix[1] = matrix[2] = 0.f;
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int tx, ty;
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const HBINT8 *p = &StructAfter<const HBINT8> (glyphIndex);
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if (flags & ARG_1_AND_2_ARE_WORDS)
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{
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tx = *(const HBINT16 *) p;
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p += HBINT16::static_size;
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ty = *(const HBINT16 *) p;
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p += HBINT16::static_size;
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}
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else
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{
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tx = *p++;
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ty = *p++;
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}
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if (is_anchored ()) tx = ty = 0;
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trans.init ((float) tx, (float) ty);
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{
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const F2DOT14 *points = (const F2DOT14 *) p;
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if (flags & WE_HAVE_A_SCALE)
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{
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matrix[0] = matrix[3] = points[0].to_float ();
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return true;
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}
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else if (flags & WE_HAVE_AN_X_AND_Y_SCALE)
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{
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matrix[0] = points[0].to_float ();
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matrix[3] = points[1].to_float ();
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return true;
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}
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else if (flags & WE_HAVE_A_TWO_BY_TWO)
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{
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matrix[0] = points[0].to_float ();
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matrix[1] = points[1].to_float ();
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matrix[2] = points[2].to_float ();
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matrix[3] = points[3].to_float ();
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return true;
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}
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}
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return tx || ty;
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}
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protected:
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HBUINT16 flags;
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HBGlyphID16 glyphIndex;
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public:
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DEFINE_SIZE_MIN (4);
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};
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struct composite_iter_t : hb_iter_with_fallback_t<composite_iter_t, const CompositeGlyphChain &>
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{
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typedef const CompositeGlyphChain *__item_t__;
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composite_iter_t (hb_bytes_t glyph_, __item_t__ current_) :
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glyph (glyph_), current (nullptr), current_size (0)
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{
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set_next (current_);
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}
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composite_iter_t () : glyph (hb_bytes_t ()), current (nullptr), current_size (0) {}
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const CompositeGlyphChain &__item__ () const { return *current; }
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bool __more__ () const { return current; }
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void __next__ ()
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{
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if (!current->has_more ()) { current = nullptr; return; }
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set_next (&StructAtOffset<CompositeGlyphChain> (current, current_size));
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}
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2022-06-26 01:45:21 +02:00
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composite_iter_t __end__ () const { return composite_iter_t (); }
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2022-06-26 00:38:50 +02:00
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bool operator != (const composite_iter_t& o) const
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2022-06-26 01:45:21 +02:00
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{ return current != o.current; }
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2022-06-26 00:38:50 +02:00
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void set_next (const CompositeGlyphChain *composite)
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{
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if (!glyph.check_range (composite, CompositeGlyphChain::min_size))
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{
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current = nullptr;
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current_size = 0;
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return;
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}
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unsigned size = composite->get_size ();
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if (!glyph.check_range (composite, size))
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{
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current = nullptr;
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current_size = 0;
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return;
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}
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current = composite;
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current_size = size;
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}
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private:
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hb_bytes_t glyph;
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__item_t__ current;
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unsigned current_size;
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};
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enum phantom_point_index_t
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{
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PHANTOM_LEFT = 0,
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PHANTOM_RIGHT = 1,
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PHANTOM_TOP = 2,
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PHANTOM_BOTTOM = 3,
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PHANTOM_COUNT = 4
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};
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2022-06-26 01:37:59 +02:00
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struct CompositeGlyph
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{
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const GlyphHeader &header;
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hb_bytes_t bytes;
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CompositeGlyph (const GlyphHeader &header_, hb_bytes_t bytes_) :
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header (header_), bytes (bytes_) {}
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2022-06-26 00:38:50 +02:00
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2022-06-26 01:37:59 +02:00
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composite_iter_t get_iterator () const
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{ return composite_iter_t (bytes, &StructAfter<CompositeGlyphChain, GlyphHeader> (header)); }
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2022-06-26 00:38:50 +02:00
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2022-06-26 01:37:59 +02:00
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unsigned int instructions_length (hb_bytes_t bytes) const
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{
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unsigned int start = bytes.length;
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unsigned int end = bytes.length;
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const CompositeGlyphChain *last = nullptr;
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for (auto &item : get_iterator ())
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last = &item;
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if (unlikely (!last)) return 0;
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if (last->has_instructions ())
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start = (char *) last - &bytes + last->get_size ();
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if (unlikely (start > end)) return 0;
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return end - start;
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}
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2022-06-26 00:38:50 +02:00
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2022-06-26 01:37:59 +02:00
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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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const hb_bytes_t trim_padding () const { return bytes; }
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2022-06-26 00:38:50 +02:00
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2022-06-26 01:37:59 +02:00
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void drop_hints ()
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{
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for (const auto &_ : get_iterator ())
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const_cast<CompositeGlyphChain &> (_).drop_instructions_flag ();
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}
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/* Chop instructions off the end */
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void drop_hints_bytes (hb_bytes_t &dest_start) const
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{ dest_start = bytes.sub_array (0, bytes.length - instructions_length (bytes)); }
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void set_overlaps_flag ()
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{
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CompositeGlyphChain& glyph_chain = const_cast<CompositeGlyphChain &> (
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StructAfter<CompositeGlyphChain, GlyphHeader> (header));
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if (!bytes.check_range(&glyph_chain, CompositeGlyphChain::min_size))
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return;
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glyph_chain.set_overlaps_flag ();
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}
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};
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2022-06-26 00:38:50 +02:00
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2022-06-26 01:37:59 +02:00
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struct Glyph
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{
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2022-06-26 00:38:50 +02:00
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enum glyph_type_t { EMPTY, SIMPLE, COMPOSITE };
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public:
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composite_iter_t get_composite_iterator () const
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{
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if (type != COMPOSITE) return composite_iter_t ();
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return CompositeGlyph (*header, bytes).get_iterator ();
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}
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2022-06-26 01:37:59 +02:00
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const hb_bytes_t trim_padding () const
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2022-06-26 00:38:50 +02:00
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{
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switch (type) {
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case COMPOSITE: return CompositeGlyph (*header, bytes).trim_padding ();
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case SIMPLE: return SimpleGlyph (*header, bytes).trim_padding ();
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default: return bytes;
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}
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}
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void drop_hints ()
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{
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switch (type) {
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case COMPOSITE: CompositeGlyph (*header, bytes).drop_hints (); return;
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case SIMPLE: SimpleGlyph (*header, bytes).drop_hints (); return;
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default: return;
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}
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}
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void set_overlaps_flag ()
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{
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switch (type) {
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case COMPOSITE: CompositeGlyph (*header, bytes).set_overlaps_flag (); return;
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case SIMPLE: SimpleGlyph (*header, bytes).set_overlaps_flag (); return;
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default: return;
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}
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}
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void drop_hints_bytes (hb_bytes_t &dest_start, hb_bytes_t &dest_end) const
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{
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switch (type) {
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case COMPOSITE: CompositeGlyph (*header, bytes).drop_hints_bytes (dest_start); return;
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case SIMPLE: SimpleGlyph (*header, bytes).drop_hints_bytes (dest_start, dest_end); return;
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default: return;
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}
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}
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/* Note: Recursively calls itself.
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* all_points includes phantom points
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*/
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template <typename accelerator_t>
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bool get_points (hb_font_t *font, const accelerator_t &glyf_accelerator,
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contour_point_vector_t &all_points /* OUT */,
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bool phantom_only = false,
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unsigned int depth = 0) const
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{
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if (unlikely (depth > HB_MAX_NESTING_LEVEL)) return false;
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contour_point_vector_t points;
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switch (type) {
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case COMPOSITE:
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{
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/* pseudo component points for each component in composite glyph */
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unsigned num_points = hb_len (CompositeGlyph (*header, bytes).get_iterator ());
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if (unlikely (!points.resize (num_points))) return false;
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for (unsigned i = 0; i < points.length; i++)
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points[i].init ();
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break;
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}
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case SIMPLE:
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if (unlikely (!SimpleGlyph (*header, bytes).get_contour_points (points, phantom_only)))
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return false;
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break;
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}
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/* Init phantom points */
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if (unlikely (!points.resize (points.length + PHANTOM_COUNT))) return false;
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hb_array_t<contour_point_t> phantoms = points.sub_array (points.length - PHANTOM_COUNT, PHANTOM_COUNT);
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{
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for (unsigned i = 0; i < PHANTOM_COUNT; ++i) phantoms[i].init ();
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int h_delta = (int) header->xMin -
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glyf_accelerator.hmtx->get_side_bearing (gid);
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int v_orig = (int) header->yMax +
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#ifndef HB_NO_VERTICAL
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glyf_accelerator.vmtx->get_side_bearing (gid)
|
|
|
|
#else
|
|
|
|
0
|
|
|
|
#endif
|
|
|
|
;
|
|
|
|
unsigned h_adv = glyf_accelerator.hmtx->get_advance (gid);
|
|
|
|
unsigned v_adv =
|
|
|
|
#ifndef HB_NO_VERTICAL
|
|
|
|
glyf_accelerator.vmtx->get_advance (gid)
|
|
|
|
#else
|
|
|
|
- font->face->get_upem ()
|
|
|
|
#endif
|
|
|
|
;
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifndef HB_NO_VAR
|
|
|
|
glyf_accelerator.gvar->apply_deltas_to_points (gid, font, points.as_array ());
|
|
|
|
#endif
|
|
|
|
|
|
|
|
switch (type) {
|
|
|
|
case SIMPLE:
|
|
|
|
all_points.extend (points.as_array ());
|
|
|
|
break;
|
|
|
|
case COMPOSITE:
|
|
|
|
{
|
|
|
|
unsigned int comp_index = 0;
|
|
|
|
for (auto &item : get_composite_iterator ())
|
|
|
|
{
|
|
|
|
contour_point_vector_t comp_points;
|
|
|
|
if (unlikely (!glyf_accelerator.glyph_for_gid (item.get_glyph_index ())
|
|
|
|
.get_points (font, glyf_accelerator, comp_points,
|
|
|
|
phantom_only, depth + 1)
|
|
|
|
|| 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 translation 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);
|
|
|
|
} break;
|
|
|
|
default:
|
|
|
|
all_points.extend (phantoms);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (depth == 0) /* Apply at top level */
|
|
|
|
{
|
|
|
|
/* Undocumented rasterizer behavior:
|
|
|
|
* Shift points horizontally by the updated left side bearing
|
|
|
|
*/
|
|
|
|
contour_point_t delta;
|
|
|
|
delta.init (-phantoms[PHANTOM_LEFT].x, 0.f);
|
|
|
|
if (delta.x) all_points.translate (delta);
|
|
|
|
}
|
|
|
|
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool get_extents (hb_font_t *font, const glyf_accelerator_t &glyf_accelerator,
|
|
|
|
hb_glyph_extents_t *extents) const
|
|
|
|
{
|
|
|
|
if (type == EMPTY) return true; /* Empty glyph; zero extents. */
|
|
|
|
return header->get_extents (font, glyf_accelerator, gid, extents);
|
|
|
|
}
|
|
|
|
|
|
|
|
hb_bytes_t get_bytes () const { return bytes; }
|
|
|
|
|
|
|
|
Glyph (hb_bytes_t bytes_ = hb_bytes_t (),
|
|
|
|
hb_codepoint_t gid_ = (hb_codepoint_t) -1) : bytes (bytes_), gid (gid_),
|
|
|
|
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;
|
|
|
|
hb_codepoint_t gid;
|
|
|
|
const GlyphHeader *header;
|
|
|
|
unsigned type;
|
|
|
|
};
|
|
|
|
|
|
|
|
|
2022-06-26 01:50:44 +02:00
|
|
|
} /* namespace glyf_impl */
|
2022-06-26 00:38:50 +02:00
|
|
|
} /* namespace OT */
|
|
|
|
|
|
|
|
|
|
|
|
#endif /* OT_GLYF_GLYPH_HH */
|