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[otfallback] Don't shift down above-marks too much

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This seems to generate much better, almost-perfect, positioning for
Arabic as well as Latin above marks.
This commit is contained in:
Behdad Esfahbod 2013-10-18 16:08:53 +02:00
parent dba9580237
commit 0193649ce4
1 changed files with 9 additions and 1 deletions
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10
src/hb-ot-shape-fallback.cc
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@ -261,7 +261,7 @@ position_mark (const hb_ot_shape_plan_t *plan,
case HB_UNICODE_COMBINING_CLASS_ATTACHED_BELOW_LEFT:
case HB_UNICODE_COMBINING_CLASS_ATTACHED_BELOW:
pos.y_offset = base_extents.y_bearing + base_extents.height - mark_extents.y_bearing;
/* Never shift a "below" mark upwards. */
/* Never shift up "below" marks. */
if ((y_gap > 0) == (pos.y_offset > 0))
{
base_extents.height -= pos.y_offset;
@ -281,6 +281,14 @@ position_mark (const hb_ot_shape_plan_t *plan,
case HB_UNICODE_COMBINING_CLASS_ATTACHED_ABOVE:
case HB_UNICODE_COMBINING_CLASS_ATTACHED_ABOVE_RIGHT:
pos.y_offset = base_extents.y_bearing - (mark_extents.y_bearing + mark_extents.height);
/* Don't shift down "above" marks too much. */
if ((y_gap > 0) != (pos.y_offset > 0))
{
unsigned int correction = -pos.y_offset / 2;
base_extents.y_bearing += correction;
base_extents.height -= correction;
pos.y_offset += correction;
}
base_extents.y_bearing -= mark_extents.height;
base_extents.height += mark_extents.height;
break;