[glyf] Move GlyphHeader related logics to its, making its fields protected
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Ebrahim Byagowi
parent
d57819cbdb
commit
139d14dc89
@ -231,19 +231,18 @@ struct glyf
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_zero_instruction_length (hb_bytes_t glyph)
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{
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const GlyphHeader &glyph_header = StructAtOffset<GlyphHeader> (&glyph, 0);
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int16_t num_contours = (int16_t) glyph_header.numberOfContours;
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if (num_contours <= 0) return; // only for simple glyphs
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if (!glyph_header.is_simple_glyph ()) return; // only for simple glyphs
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unsigned int contours_length = GlyphHeader::static_size + 2 * num_contours;
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const HBUINT16 &instruction_length = StructAtOffset<HBUINT16> (&glyph,
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contours_length);
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(HBUINT16 &) instruction_length = 0;
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unsigned int instruction_len_offset = glyph_header.simple_instruction_len_offset ();
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const HBUINT16 &instruction_len = StructAtOffset<HBUINT16> (&glyph,
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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 = StructAtOffset<GlyphHeader> (&glyph, 0);
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if (glyph_header.numberOfContours >= 0) return true; // only for composites
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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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OT::glyf::CompositeGlyphHeader::Iterator composite_it;
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@ -280,6 +279,24 @@ struct glyf
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struct GlyphHeader
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{
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unsigned int simple_instruction_len_offset () const
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{ return static_size + 2 * numberOfContours; }
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unsigned int simple_length (unsigned int instruction_len) const
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{ return simple_instruction_len_offset () + 2 + instruction_len; }
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bool is_composite_glyph () const { return numberOfContours < 0; }
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bool is_simple_glyph () const { return numberOfContours > 0; }
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void get_extents (hb_glyph_extents_t *extents) const
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{
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extents->x_bearing = hb_min (xMin, xMax);
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extents->y_bearing = hb_max (yMin, yMax);
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extents->width = hb_max (xMin, xMax) - extents->x_bearing;
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extents->height = hb_min (yMin, yMax) - extents->y_bearing;
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}
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protected:
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HBINT16 numberOfContours; /* 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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@ -288,7 +305,7 @@ struct glyf
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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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public:
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DEFINE_SIZE_STATIC (10);
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};
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@ -368,7 +385,7 @@ struct glyf
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return false; /* Empty glyph; zero extents. */
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const GlyphHeader &glyph_header = StructAtOffset<GlyphHeader> (glyph_data, 0);
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if (glyph_header.numberOfContours < 0)
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if (glyph_header.is_composite_glyph ())
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{
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const CompositeGlyphHeader *possible =
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&StructAfter<CompositeGlyphHeader, GlyphHeader> (glyph_header);
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@ -452,16 +469,15 @@ struct glyf
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const char *glyph = ((const char *) glyf_table) + start_offset;
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const char * const glyph_end = glyph + (*end_offset - start_offset);
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const GlyphHeader &glyph_header = StructAtOffset<GlyphHeader> (glyph, 0);
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int16_t num_contours = (int16_t) glyph_header.numberOfContours;
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if (num_contours < 0)
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if (glyph_header.is_composite_glyph ())
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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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return true;
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else if (num_contours > 0)
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else if (glyph_header.is_simple_glyph ())
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{
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/* simple glyph w/contours, possibly trimmable */
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glyph += GlyphHeader::static_size + 2 * num_contours;
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glyph += glyph_header.simple_instruction_len_offset ();
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if (unlikely (glyph + 2 >= glyph_end)) return false;
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uint16_t nCoordinates = (uint16_t) StructAtOffset<HBUINT16> (glyph - 2, 0) + 1;
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@ -555,10 +571,8 @@ struct glyf
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return glyph.length == 0;
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}
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const GlyphHeader &glyph_header = StructAtOffset<GlyphHeader> (&glyph, 0);
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int16_t num_contours = (int16_t) glyph_header.numberOfContours;
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if (num_contours < 0)
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if (glyph_header.is_composite_glyph ())
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{
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// composite glyph
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unsigned int start = glyph.length;
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unsigned int end = glyph.length;
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unsigned int glyph_offset = &glyph - glyf_table;
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@ -585,8 +599,7 @@ struct glyf
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}
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else
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{
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/* simple glyph */
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unsigned int instruction_len_offset = GlyphHeader::static_size + 2 * num_contours;
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unsigned int instruction_len_offset = glyph_header.simple_instruction_len_offset ();
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if (unlikely (instruction_len_offset + 2 > glyph.length))
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{
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DEBUG_MSG (SUBSET, nullptr, "Glyph size is too short, missing field "
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@ -597,7 +610,7 @@ struct glyf
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const HBUINT16 &instruction_len = StructAtOffset<HBUINT16> (&glyph,
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instruction_len_offset);
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/* Out of bounds of the current glyph */
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if (unlikely (instruction_len_offset + 2 + instruction_len > glyph.length))
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if (unlikely (glyph_header.simple_length (instruction_len) > glyph.length))
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{
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DEBUG_MSG (SUBSET, nullptr, "The instructions array overruns the "
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"glyph's boundaries.");
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@ -619,14 +632,7 @@ struct glyf
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const GlyphHeader &glyph_header = StructAtOffset<GlyphHeader> (glyf_table,
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start_offset);
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extents->x_bearing = hb_min (glyph_header.xMin, glyph_header.xMax);
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extents->y_bearing = hb_max (glyph_header.yMin, glyph_header.yMax);
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extents->width = hb_max (glyph_header.xMin, glyph_header.xMax)
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- extents->x_bearing;
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extents->height = hb_min (glyph_header.yMin, glyph_header.yMax)
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- extents->y_bearing;
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glyph_header.get_extents (extents);
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return true;
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}
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@ -709,20 +715,17 @@ struct glyf
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}
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const GlyphHeader& header = StructAtOffset<GlyphHeader> (&source_glyph, 0);
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int16_t num_contours = (int16_t) header.numberOfContours;
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DEBUG_MSG (SUBSET, nullptr, "new_gid %d (%d contours) drop %d instruction bytes "
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DEBUG_MSG (SUBSET, nullptr, "new_gid %d drop %d instruction bytes "
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"from %d byte source glyph",
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new_gid, num_contours, instruction_len, source_glyph.length);
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if (num_contours < 0)
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new_gid, instruction_len, source_glyph.length);
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if (header.is_composite_glyph ())
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{
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/* composite, just chop instructions off the end */
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/* just chop instructions off the end for composite glyphs */
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dest_start = hb_bytes_t (&source_glyph, source_glyph.length - instruction_len);
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}
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else
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{
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/* simple glyph */
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unsigned int glyph_length = GlyphHeader::static_size + 2 * header.numberOfContours
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+ 2 + instruction_len;
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unsigned int glyph_length = header.simple_length (instruction_len);
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dest_start = hb_bytes_t (&source_glyph, glyph_length - instruction_len);
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dest_end = hb_bytes_t (&source_glyph + glyph_length,
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source_glyph.length - glyph_length);
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