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Further adjust mark advance zeroing 

This is a followup to 568000274c.
Looks like in the Latin shaper, Uniscribe zeroes all Unicode NSM
advances *after* GPOS, not before.  Match that.

Can be tested using DejaVu Sans Mono, since that font has GPOS
rules to zero the mark advances on its own.
This commit is contained in:
Behdad Esfahbod 2013-02-13 05:57:24 -05:00
parent 85c51ec2e1
commit 0291a65286
1 changed files with 23 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
src/hb-ot-shape.cc
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@ -418,17 +418,10 @@ hb_ot_position_default (hb_ot_shape_context_t *c)
}
/* Zero'ing mark widths by GDEF (as used in Myanmar spec) happens
* *before* GPOS. */
switch (c->plan->shaper->zero_width_marks)
{
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_UNICODE:
for (unsigned int i = 0; i < count; i++)
if (_hb_glyph_info_get_general_category (&c->buffer->info[i]) == HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)
{
c->buffer->pos[i].x_advance = 0;
c->buffer->pos[i].y_advance = 0;
}
break;
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF:
for (unsigned int i = 0; i < count; i++)
if ((c->buffer->info[i].glyph_props() & HB_OT_LAYOUT_GLYPH_PROPS_MARK))
@ -440,6 +433,7 @@ hb_ot_position_default (hb_ot_shape_context_t *c)
default:
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE:
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_UNICODE:
break;
}
}
@ -448,12 +442,12 @@ static inline bool
hb_ot_position_complex (hb_ot_shape_context_t *c)
{
bool ret = false;
unsigned int count = c->buffer->len;
if (hb_ot_layout_has_positioning (c->face))
{
/* Change glyph origin to what GPOS expects, apply GPOS, change it back. */
unsigned int count = c->buffer->len;
for (unsigned int i = 0; i < count; i++) {
c->font->add_glyph_origin_for_direction (c->buffer->info[i].codepoint,
HB_DIRECTION_LTR,
@ -473,6 +467,25 @@ hb_ot_position_complex (hb_ot_shape_context_t *c)
ret = true;
}
/* Zero'ing mark widths by Unicode happens
* *after* GPOS. */
switch (c->plan->shaper->zero_width_marks)
{
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_UNICODE:
for (unsigned int i = 0; i < count; i++)
if (_hb_glyph_info_get_general_category (&c->buffer->info[i]) == HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)
{
c->buffer->pos[i].x_advance = 0;
c->buffer->pos[i].y_advance = 0;
}
break;
default:
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE:
case HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF:
break;
}
hb_ot_layout_position_finish (c->font, c->buffer);
return ret;