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Reordering fails when GDEF table is absent #2140 

Preserve glyph class if there's no GDEF and no guess.

Fixes https://github.com/harfbuzz/harfbuzz/issues/2140
This commit is contained in:
Behdad Esfahbod 2020-04-22 14:45:57 -07:00
parent 05be05eb65
commit f4cd99f28e
2 changed files with 25 additions and 22 deletions
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39
src/hb-ot-layout-gsubgpos.hh
View File

@ -645,53 +645,56 @@ struct hb_ot_apply_context_t :
return true;
}
void _set_glyph_props (hb_codepoint_t glyph_index,
unsigned int class_guess = 0,
bool ligature = false,
bool component = false) const
void _set_glyph_class (hb_codepoint_t glyph_index,
unsigned int class_guess = 0,
bool ligature = false,
bool component = false) const
{
unsigned int add_in = _hb_glyph_info_get_glyph_props (&buffer->cur()) &
HB_OT_LAYOUT_GLYPH_PROPS_PRESERVE;
add_in |= HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED;
unsigned int props = _hb_glyph_info_get_glyph_props (&buffer->cur());
props |= HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED;
if (ligature)
{
add_in |= HB_OT_LAYOUT_GLYPH_PROPS_LIGATED;
props |= HB_OT_LAYOUT_GLYPH_PROPS_LIGATED;
/* In the only place that the MULTIPLIED bit is used, Uniscribe
* seems to only care about the "last" transformation between
* Ligature and Multiple substitutions. Ie. if you ligate, expand,
* and ligate again, it forgives the multiplication and acts as
* if only ligation happened. As such, clear MULTIPLIED bit.
*/
add_in &= ~HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED;
props &= ~HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED;
}
if (component)
add_in |= HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED;
props |= HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED;
if (likely (has_glyph_classes))
_hb_glyph_info_set_glyph_props (&buffer->cur(), add_in | gdef.get_glyph_props (glyph_index));
props = (props & ~HB_OT_LAYOUT_GLYPH_PROPS_CLASS_MASK) | gdef.get_glyph_props (glyph_index);
else if (class_guess)
_hb_glyph_info_set_glyph_props (&buffer->cur(), add_in | class_guess);
props = (props & ~HB_OT_LAYOUT_GLYPH_PROPS_CLASS_MASK) | class_guess;
_hb_glyph_info_set_glyph_props (&buffer->cur(), props);
}
void replace_glyph (hb_codepoint_t glyph_index) const
{
_set_glyph_props (glyph_index);
_set_glyph_class (glyph_index);
buffer->replace_glyph (glyph_index);
}
void replace_glyph_inplace (hb_codepoint_t glyph_index) const
{
_set_glyph_props (glyph_index);
_set_glyph_class (glyph_index);
buffer->cur().codepoint = glyph_index;
}
void replace_glyph_with_ligature (hb_codepoint_t glyph_index,
unsigned int class_guess) const
unsigned int class_guess) const
{
_set_glyph_props (glyph_index, class_guess, true);
_set_glyph_class (glyph_index, class_guess, true);
buffer->replace_glyph (glyph_index);
}
void output_glyph_for_component (hb_codepoint_t glyph_index,
unsigned int class_guess) const
unsigned int class_guess) const
{
_set_glyph_props (glyph_index, class_guess, false, true);
_set_glyph_class (glyph_index, class_guess, false, true);
buffer->output_glyph (glyph_index);
}
};

8
src/hb-ot-layout.hh
View File

@ -80,14 +80,14 @@ enum hb_ot_layout_glyph_props_flags_t
HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE = 0x04u,
HB_OT_LAYOUT_GLYPH_PROPS_MARK = 0x08u,
HB_OT_LAYOUT_GLYPH_PROPS_CLASS_MASK = HB_OT_LAYOUT_GLYPH_PROPS_BASE_GLYPH |
HB_OT_LAYOUT_GLYPH_PROPS_LIGATURE |
HB_OT_LAYOUT_GLYPH_PROPS_MARK,
/* The following are used internally; not derived from GDEF. */
HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED = 0x10u,
HB_OT_LAYOUT_GLYPH_PROPS_LIGATED = 0x20u,
HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED = 0x40u,
HB_OT_LAYOUT_GLYPH_PROPS_PRESERVE = HB_OT_LAYOUT_GLYPH_PROPS_SUBSTITUTED |
HB_OT_LAYOUT_GLYPH_PROPS_LIGATED |
HB_OT_LAYOUT_GLYPH_PROPS_MULTIPLIED
};
HB_MARK_AS_FLAG_T (hb_ot_layout_glyph_props_flags_t);