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[GPOS] Negate sign of attach_lookback(), and rename it to attach_chain()

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No behavior change.  Preparing to unify how cursive and mark attachments
work.
This commit is contained in:
Behdad Esfahbod 2016-02-11 14:49:10 +07:00
parent 5b5dc2c040
commit 0f6278d1fb
1 changed files with 9 additions and 8 deletions
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17
src/hb-ot-layout-gpos-table.hh
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@ -36,8 +36,8 @@ namespace OT {
/* buffer **position** var allocations */
#define attach_lookback() var.u16[0] /* number of glyphs to go back to attach this glyph to its base */
#define cursive_chain() var.i16[1] /* character to which this connects, may be positive or negative */
#define attach_chain() var.i16[0] /* glyph to which this attaches to, relative to current glyphs; negative for going back. */
#define cursive_chain() var.i16[1] /* glyph to which this connects, may be positive or negative */
/* Shared Tables: ValueRecord, Anchor Table, and MarkArray */
@ -425,7 +425,7 @@ struct MarkArray : ArrayOf<MarkRecord> /* Array of MarkRecords--in Coverage orde
hb_glyph_position_t &o = buffer->cur_pos();
o.x_offset = base_x - mark_x;
o.y_offset = base_y - mark_y;
o.attach_lookback() = buffer->idx - glyph_pos;
o.attach_chain() = (int) glyph_pos - (int) buffer->idx;
buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT;
buffer->idx++;
@ -993,7 +993,7 @@ struct CursivePosFormat1
*/
reverse_cursive_minor_offset (pos, child, c->direction, parent);
pos[child].cursive_chain() = parent - child;
pos[child].cursive_chain() = (int) parent - (int) child;
buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_CURSIVE;
if (likely (HB_DIRECTION_IS_HORIZONTAL (c->direction)))
pos[child].y_offset = y_offset;
@ -1561,10 +1561,11 @@ fix_cursive_minor_offset (hb_glyph_position_t *pos, unsigned int i, hb_direction
static void
fix_mark_attachment (hb_glyph_position_t *pos, unsigned int i, hb_direction_t direction)
{
if (likely (!(pos[i].attach_lookback())))
unsigned int j = pos[i].attach_chain();
if (likely (!j))
return;
unsigned int j = i - pos[i].attach_lookback();
j += i;
pos[i].x_offset += pos[j].x_offset;
pos[i].y_offset += pos[j].y_offset;
@ -1588,7 +1589,7 @@ GPOS::position_start (hb_font_t *font HB_UNUSED, hb_buffer_t *buffer)
unsigned int count = buffer->len;
for (unsigned int i = 0; i < count; i++)
buffer->pos[i].attach_lookback() = buffer->pos[i].cursive_chain() = 0;
buffer->pos[i].attach_chain() = buffer->pos[i].cursive_chain() = 0;
}
void
@ -1637,7 +1638,7 @@ template <typename context_t>
}
#undef attach_lookback
#undef attach_chain
#undef cursive_chain