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[GPOS] Merge attach_chain() and cursive_chain() 

Differentiate, using new attach_type().
This commit is contained in:
Behdad Esfahbod 2016-02-11 15:25:28 +07:00
parent 806ad8dc65
commit 686567baab
1 changed files with 32 additions and 18 deletions
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50
src/hb-ot-layout-gpos-table.hh
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@ -36,8 +36,17 @@ namespace OT {
/* buffer **position** var allocations */
#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 */
#define attach_chain() var.i16[0] /* glyph to which this attaches to, relative to current glyphs; negative for going back, positive for forward. */
#define attach_type() var.u8[2] /* attachment type */
/* Note! if attach_chain() is zero, the value of attach_type() is irrelevant. */
enum attach_type_t {
ATTACH_TYPE_NONE = 0X00,
/* Each attachment should be either a mark or a cursive; can't be both. */
ATTACH_TYPE_MARK = 0X01,
ATTACH_TYPE_CURSIVE = 0X02,
};
/* Shared Tables: ValueRecord, Anchor Table, and MarkArray */
@ -425,6 +434,7 @@ 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_type() = ATTACH_TYPE_MARK;
o.attach_chain() = (int) glyph_pos - (int) buffer->idx;
buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT;
@ -993,7 +1003,8 @@ struct CursivePosFormat1
*/
reverse_cursive_minor_offset (pos, child, c->direction, parent);
pos[child].cursive_chain() = (int) parent - (int) child;
pos[child].attach_type() = ATTACH_TYPE_CURSIVE;
pos[child].attach_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;
@ -1518,14 +1529,13 @@ struct GPOS : GSUBGPOS
static void
reverse_cursive_minor_offset (hb_glyph_position_t *pos, unsigned int i, hb_direction_t direction, unsigned int new_parent)
{
unsigned int j = pos[i].cursive_chain();
if (likely (!j))
int chain = pos[i].attach_chain(), type = pos[i].attach_type();
if (likely (!chain || 0 == (type & ATTACH_TYPE_CURSIVE)))
return;
int old_chain = j;
pos[i].cursive_chain() = 0;
pos[i].attach_chain() = 0;
j += i;
unsigned int j = (int) i + chain;
/* Stop if we see new parent in the chain. */
if (j == new_parent)
@ -1538,17 +1548,19 @@ reverse_cursive_minor_offset (hb_glyph_position_t *pos, unsigned int i, hb_direc
else
pos[j].x_offset = -pos[i].x_offset;
pos[j].cursive_chain() = -old_chain;
pos[j].attach_chain() = -chain;
pos[j].attach_type() = type;
}
static void
fix_cursive_minor_offset (hb_glyph_position_t *pos, unsigned int i, hb_direction_t direction)
{
unsigned int j = pos[i].cursive_chain();
if (likely (!j))
int chain = pos[i].attach_chain(), type = pos[i].attach_type();
if (likely (!chain || 0 == (type & ATTACH_TYPE_CURSIVE)))
return;
pos[i].cursive_chain() = 0;
j += i;
pos[i].attach_chain() = 0;
unsigned int j = (int) i + chain;
fix_cursive_minor_offset (pos, j, direction);
@ -1561,15 +1573,17 @@ 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)
{
unsigned int j = pos[i].attach_chain();
if (likely (!j))
int chain = pos[i].attach_chain(), type = pos[i].attach_type();
if (likely (!chain || 0 == (type & ATTACH_TYPE_MARK)))
return;
j += i;
unsigned int j = (int) i + chain;
pos[i].x_offset += pos[j].x_offset;
pos[i].y_offset += pos[j].y_offset;
assert (j < i);
if (HB_DIRECTION_IS_FORWARD (direction))
for (unsigned int k = j; k < i; k++) {
pos[i].x_offset -= pos[k].x_advance;
@ -1589,7 +1603,7 @@ 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_chain() = buffer->pos[i].cursive_chain() = 0;
buffer->pos[i].attach_chain() = buffer->pos[i].attach_type() = 0;
}
void
@ -1639,7 +1653,7 @@ template <typename context_t>
#undef attach_chain
#undef cursive_chain
#undef attach_type
} /* namespace OT */