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[GPOS] Merge fixing of offsets for cursive and mark attachments 

Part of fixing https://github.com/behdad/harfbuzz/issues/211
This commit is contained in:
Behdad Esfahbod 2016-02-11 16:48:13 +07:00
parent 7d8d58ac81
commit cbc3a76c5a
2 changed files with 33 additions and 43 deletions
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3
src/hb-buffer-private.hh
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@ -56,8 +56,7 @@ enum hb_buffer_scratch_flags_t {
HB_BUFFER_SCRATCH_FLAG_HAS_NON_ASCII = 0x00000001u,
HB_BUFFER_SCRATCH_FLAG_HAS_DEFAULT_IGNORABLES = 0x00000002u,
HB_BUFFER_SCRATCH_FLAG_HAS_SPACE_FALLBACK = 0x00000004u,
HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_CURSIVE = 0x00000008u,
HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT = 0x00000010u,
HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT = 0x00000008u,
/* Reserved for complex shapers' internal use. */
HB_BUFFER_SCRATCH_FLAG_COMPLEX0 = 0x01000000u,
HB_BUFFER_SCRATCH_FLAG_COMPLEX1 = 0x02000000u,

73
src/hb-ot-layout-gpos-table.hh
View File

@ -1005,7 +1005,7 @@ struct CursivePosFormat1
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;
buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT;
if (likely (HB_DIRECTION_IS_HORIZONTAL (c->direction)))
pos[child].y_offset = y_offset;
else
@ -1553,50 +1553,46 @@ reverse_cursive_minor_offset (hb_glyph_position_t *pos, unsigned int i, hb_direc
pos[j].attach_type() = type;
}
static void
fix_cursive_minor_offset (hb_glyph_position_t *pos, unsigned int i, hb_direction_t direction)
propagate_attachment_offsets (hb_glyph_position_t *pos, unsigned int i, hb_direction_t direction)
{
/* Adjusts offsets of attached glyphs (both cursive and mark) to accumulate
* offset of glyph they are attached to. */
int chain = pos[i].attach_chain(), type = pos[i].attach_type();
if (likely (!chain || 0 == (type & ATTACH_TYPE_CURSIVE)))
if (likely (!chain))
return;
unsigned int j = (int) i + chain;
pos[i].attach_chain() = 0;
unsigned int j = (int) i + chain;
propagate_attachment_offsets (pos, j, direction);
fix_cursive_minor_offset (pos, j, direction);
assert (!!(type & ATTACH_TYPE_MARK) ^ !!(type & ATTACH_TYPE_CURSIVE));
if (HB_DIRECTION_IS_HORIZONTAL (direction))
pos[i].y_offset += pos[j].y_offset;
else
if (type & ATTACH_TYPE_CURSIVE)
{
if (HB_DIRECTION_IS_HORIZONTAL (direction))
pos[i].y_offset += pos[j].y_offset;
else
pos[i].x_offset += pos[j].x_offset;
}
else /*if (type & ATTACH_TYPE_MARK)*/
{
pos[i].x_offset += pos[j].x_offset;
}
pos[i].y_offset += pos[j].y_offset;
static void
fix_mark_attachment (hb_glyph_position_t *pos, unsigned int i, hb_direction_t direction)
{
int chain = pos[i].attach_chain(), type = pos[i].attach_type();
if (likely (!chain || 0 == (type & ATTACH_TYPE_MARK)))
return;
unsigned int j = (int) i + chain;
fix_mark_attachment (pos, j, direction);
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;
pos[i].y_offset -= pos[k].y_advance;
}
else
for (unsigned int k = j + 1; k < i + 1; k++) {
pos[i].x_offset += pos[k].x_advance;
pos[i].y_offset += pos[k].y_advance;
}
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;
pos[i].y_offset -= pos[k].y_advance;
}
else
for (unsigned int k = j + 1; k < i + 1; k++) {
pos[i].x_offset += pos[k].x_advance;
pos[i].y_offset += pos[k].y_advance;
}
}
}
void
@ -1622,15 +1618,10 @@ GPOS::position_finish_offsets (hb_font_t *font HB_UNUSED, hb_buffer_t *buffer)
hb_glyph_position_t *pos = hb_buffer_get_glyph_positions (buffer, &len);
hb_direction_t direction = buffer->props.direction;
/* Handle cursive connections */
if (buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_CURSIVE)
for (unsigned int i = 0; i < len; i++)
fix_cursive_minor_offset (pos, i, direction);
/* Handle attachments */
if (buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT)
for (unsigned int i = 0; i < len; i++)
fix_mark_attachment (pos, i, direction);
propagate_attachment_offsets (pos, i, direction);
}