[glyf] Split off SimpleGlyph.hh
This commit is contained in:
Behdad Esfahbod
parent
8ed78627f0
commit
f0ec2b728e
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@ -92,6 +92,7 @@ HB_BASE_sources = \
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OT/glyf/loca.hh \
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OT/glyf/Glyph.hh \
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OT/glyf/GlyphHeader.hh \
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OT/glyf/SimpleGlyph.hh \
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OT/glyf/SubsetGlyph.hh \
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OT/Layout/GSUB/Common.hh \
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OT/Layout/GSUB/Sequence.hh \
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@ -5,6 +5,7 @@
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#include "../../hb-open-type.hh"
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#include "GlyphHeader.hh"
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#include "SimpleGlyph.hh"
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namespace OT {
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@ -218,189 +219,6 @@ enum phantom_point_index_t
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PHANTOM_COUNT = 4
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};
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struct SimpleGlyph
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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_OVERLAP_SIMPLE = 0x40,
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FLAG_RESERVED2 = 0x80
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};
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const GlyphHeader &header;
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hb_bytes_t bytes;
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SimpleGlyph (const GlyphHeader &header_, hb_bytes_t bytes_) :
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header (header_), bytes (bytes_) {}
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unsigned int instruction_len_offset () const
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{ return GlyphHeader::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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unsigned int instructions_length () 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 > bytes.length)) return 0;
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const HBUINT16 &instructionLength = StructAtOffset<HBUINT16> (&bytes, instruction_length_offset);
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/* Out of bounds of the current glyph */
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if (unlikely (length (instructionLength) > bytes.length)) return 0;
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return instructionLength;
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}
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const hb_bytes_t trim_padding () const
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{
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/* based on FontTools _g_l_y_f.py::trim */
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const uint8_t *glyph = (uint8_t*) bytes.arrayZ;
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const uint8_t *glyph_end = 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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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 bytes.sub_array (0, 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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void drop_hints_bytes (hb_bytes_t &dest_start, hb_bytes_t &dest_end) const
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{
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unsigned int instructions_len = instructions_length ();
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unsigned int glyph_length = length (instructions_len);
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dest_start = bytes.sub_array (0, glyph_length - instructions_len);
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dest_end = bytes.sub_array (glyph_length, bytes.length - glyph_length);
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}
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void set_overlaps_flag ()
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{
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if (unlikely (!header.numberOfContours)) return;
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unsigned flags_offset = length (instructions_length ());
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if (unlikely (flags_offset + 1 > bytes.length)) return;
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HBUINT8 &first_flag = (HBUINT8 &) StructAtOffset<HBUINT16> (&bytes, flags_offset);
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first_flag = (uint8_t) first_flag | FLAG_OVERLAP_SIMPLE;
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}
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static bool read_points (const HBUINT8 *&p /* IN/OUT */,
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contour_point_vector_t &points_ /* IN/OUT */,
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const hb_bytes_t &bytes,
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void (* setter) (contour_point_t &_, float v),
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const simple_glyph_flag_t short_flag,
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const simple_glyph_flag_t same_flag)
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{
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float v = 0;
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for (unsigned i = 0; i < points_.length; i++)
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{
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uint8_t flag = points_[i].flag;
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if (flag & short_flag)
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{
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if (unlikely (!bytes.check_range (p))) return false;
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if (flag & same_flag)
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v += *p++;
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else
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v -= *p++;
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}
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else
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{
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if (!(flag & same_flag))
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{
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if (unlikely (!bytes.check_range ((const HBUINT16 *) p))) return false;
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v += *(const HBINT16 *) p;
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p += HBINT16::static_size;
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}
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}
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setter (points_[i], v);
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}
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return true;
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}
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bool get_contour_points (contour_point_vector_t &points_ /* OUT */,
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bool phantom_only = false) const
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{
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const HBUINT16 *endPtsOfContours = &StructAfter<HBUINT16> (header);
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int num_contours = header.numberOfContours;
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if (unlikely (!bytes.check_range (&endPtsOfContours[num_contours + 1]))) return false;
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unsigned int num_points = endPtsOfContours[num_contours - 1] + 1;
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points_.resize (num_points);
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for (unsigned int i = 0; i < points_.length; i++) points_[i].init ();
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if (phantom_only) return true;
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for (int i = 0; i < num_contours; i++)
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points_[endPtsOfContours[i]].is_end_point = true;
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/* Skip instructions */
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const HBUINT8 *p = &StructAtOffset<HBUINT8> (&endPtsOfContours[num_contours + 1],
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endPtsOfContours[num_contours]);
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/* Read flags */
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for (unsigned int i = 0; i < num_points; i++)
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{
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if (unlikely (!bytes.check_range (p))) return false;
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uint8_t flag = *p++;
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points_[i].flag = flag;
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if (flag & FLAG_REPEAT)
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{
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if (unlikely (!bytes.check_range (p))) return false;
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unsigned int repeat_count = *p++;
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while ((repeat_count-- > 0) && (++i < num_points))
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points_[i].flag = flag;
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}
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}
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/* Read x & y coordinates */
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return read_points (p, points_, bytes, [] (contour_point_t &p, float v) { p.x = v; },
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FLAG_X_SHORT, FLAG_X_SAME)
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&& read_points (p, points_, bytes, [] (contour_point_t &p, float v) { p.y = v; },
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FLAG_Y_SHORT, FLAG_Y_SAME);
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}
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};
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struct CompositeGlyph
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{
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const GlyphHeader &header;
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@ -0,0 +1,200 @@
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#ifndef OT_GLYF_SIMPLEGLYPH_HH
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#define OT_GLYF_SIMPLEGLYPH_HH
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#include "../../hb-open-type.hh"
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namespace OT {
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namespace glyf_impl {
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struct SimpleGlyph
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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_OVERLAP_SIMPLE = 0x40,
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FLAG_RESERVED2 = 0x80
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};
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const GlyphHeader &header;
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hb_bytes_t bytes;
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SimpleGlyph (const GlyphHeader &header_, hb_bytes_t bytes_) :
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header (header_), bytes (bytes_) {}
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unsigned int instruction_len_offset () const
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{ return GlyphHeader::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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unsigned int instructions_length () 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 > bytes.length)) return 0;
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const HBUINT16 &instructionLength = StructAtOffset<HBUINT16> (&bytes, instruction_length_offset);
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/* Out of bounds of the current glyph */
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if (unlikely (length (instructionLength) > bytes.length)) return 0;
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return instructionLength;
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}
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const hb_bytes_t trim_padding () const
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{
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/* based on FontTools _g_l_y_f.py::trim */
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const uint8_t *glyph = (uint8_t*) bytes.arrayZ;
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const uint8_t *glyph_end = 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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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 bytes.sub_array (0, 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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void drop_hints_bytes (hb_bytes_t &dest_start, hb_bytes_t &dest_end) const
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{
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unsigned int instructions_len = instructions_length ();
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unsigned int glyph_length = length (instructions_len);
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dest_start = bytes.sub_array (0, glyph_length - instructions_len);
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dest_end = bytes.sub_array (glyph_length, bytes.length - glyph_length);
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}
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void set_overlaps_flag ()
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{
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if (unlikely (!header.numberOfContours)) return;
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unsigned flags_offset = length (instructions_length ());
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if (unlikely (flags_offset + 1 > bytes.length)) return;
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HBUINT8 &first_flag = (HBUINT8 &) StructAtOffset<HBUINT16> (&bytes, flags_offset);
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first_flag = (uint8_t) first_flag | FLAG_OVERLAP_SIMPLE;
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}
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static bool read_points (const HBUINT8 *&p /* IN/OUT */,
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contour_point_vector_t &points_ /* IN/OUT */,
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const hb_bytes_t &bytes,
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void (* setter) (contour_point_t &_, float v),
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const simple_glyph_flag_t short_flag,
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const simple_glyph_flag_t same_flag)
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{
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float v = 0;
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for (unsigned i = 0; i < points_.length; i++)
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{
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uint8_t flag = points_[i].flag;
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if (flag & short_flag)
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{
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if (unlikely (!bytes.check_range (p))) return false;
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if (flag & same_flag)
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v += *p++;
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else
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v -= *p++;
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}
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else
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{
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if (!(flag & same_flag))
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{
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if (unlikely (!bytes.check_range ((const HBUINT16 *) p))) return false;
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v += *(const HBINT16 *) p;
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p += HBINT16::static_size;
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}
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}
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setter (points_[i], v);
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}
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return true;
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}
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bool get_contour_points (contour_point_vector_t &points_ /* OUT */,
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bool phantom_only = false) const
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{
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const HBUINT16 *endPtsOfContours = &StructAfter<HBUINT16> (header);
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int num_contours = header.numberOfContours;
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if (unlikely (!bytes.check_range (&endPtsOfContours[num_contours + 1]))) return false;
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unsigned int num_points = endPtsOfContours[num_contours - 1] + 1;
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points_.resize (num_points);
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for (unsigned int i = 0; i < points_.length; i++) points_[i].init ();
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if (phantom_only) return true;
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for (int i = 0; i < num_contours; i++)
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points_[endPtsOfContours[i]].is_end_point = true;
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/* Skip instructions */
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const HBUINT8 *p = &StructAtOffset<HBUINT8> (&endPtsOfContours[num_contours + 1],
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endPtsOfContours[num_contours]);
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/* Read flags */
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for (unsigned int i = 0; i < num_points; i++)
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{
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if (unlikely (!bytes.check_range (p))) return false;
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uint8_t flag = *p++;
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points_[i].flag = flag;
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if (flag & FLAG_REPEAT)
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{
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if (unlikely (!bytes.check_range (p))) return false;
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unsigned int repeat_count = *p++;
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while ((repeat_count-- > 0) && (++i < num_points))
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points_[i].flag = flag;
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}
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}
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/* Read x & y coordinates */
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return read_points (p, points_, bytes, [] (contour_point_t &p, float v) { p.x = v; },
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FLAG_X_SHORT, FLAG_X_SAME)
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&& read_points (p, points_, bytes, [] (contour_point_t &p, float v) { p.y = v; },
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FLAG_Y_SHORT, FLAG_Y_SAME);
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}
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};
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} /* namespace glyf_impl */
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} /* namespace OT */
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#endif /* OT_GLYF_SIMPLEGLYPH_HH */
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@ -96,6 +96,7 @@ hb_base_sources = files(
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'OT/glyf/loca.hh',
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'OT/glyf/Glyph.hh',
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'OT/glyf/GlyphHeader.hh',
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'OT/glyf/SimpleGlyph.hh',
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'OT/glyf/SubsetGlyph.hh',
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'OT/Layout/GSUB/Common.hh',
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'OT/Layout/GSUB/Sequence.hh',
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