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bug 799869 - [harfbuzz] improve heuristic for choosing between shapers for khmer fonts. r=behdad

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This commit is contained in:
Jonathan Kew 2012-11-21 19:31:35 +00:00
parent 2c32c78812
commit 7fc1cd6f00
1 changed files with 11 additions and 5 deletions
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16
gfx/harfbuzz/src/hb-ot-shape-complex-private.hh
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@ -283,16 +283,22 @@ hb_ot_shape_complex_categorize (const hb_ot_shape_planner_t *planner)
else
return &_hb_ot_complex_shaper_default;
case HB_SCRIPT_KHMER:
/* If the font has 'liga', let the generic shaper do it. */
if (!planner->map.found_script[0] ||
/* A number of Khmer fonts in the wild don't have a 'pref' feature,
* and as such won't shape properly via the Indic shaper;
* however, they typically have 'liga' / 'clig' features that implement
* the necessary "reordering" by means of ligature substitutions.
* So we send such pref-less fonts through the generic shaper instead;
* use Indic only if the 'khmr' script has the 'pref' feature. */
if (planner->map.found_script[0] &&
hb_ot_layout_language_find_feature (planner->face, HB_OT_TAG_GSUB,
planner->map.script_index[0],
planner->map.language_index[0],
HB_TAG ('l','i','g','a'), NULL))
return &_hb_ot_complex_shaper_default;
else
HB_TAG ('p','r','e','f'), NULL))
return &_hb_ot_complex_shaper_indic;
else
return &_hb_ot_complex_shaper_default;
case HB_SCRIPT_MYANMAR: