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-rw-r--r--Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-layout-gsubgpos.hh41
1 files changed, 27 insertions, 14 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-layout-gsubgpos.hh b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-layout-gsubgpos.hh
index 65de131f85e..3faa1e53d5c 100644
--- a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-layout-gsubgpos.hh
+++ b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-layout-gsubgpos.hh
@@ -408,12 +408,11 @@ struct hb_ot_apply_context_t :
{
matcher_t () :
lookup_props (0),
+ mask (-1),
ignore_zwnj (false),
ignore_zwj (false),
- mask (-1),
-#define arg1(arg) (arg) /* Remove the macro to see why it's needed! */
- syllable arg1(0),
-#undef arg1
+ per_syllable (false),
+ syllable {0},
match_func (nullptr),
match_data (nullptr) {}
@@ -423,7 +422,8 @@ struct hb_ot_apply_context_t :
void set_ignore_zwj (bool ignore_zwj_) { ignore_zwj = ignore_zwj_; }
void set_lookup_props (unsigned int lookup_props_) { lookup_props = lookup_props_; }
void set_mask (hb_mask_t mask_) { mask = mask_; }
- void set_syllable (uint8_t syllable_) { syllable = syllable_; }
+ void set_per_syllable (bool per_syllable_) { per_syllable = per_syllable_; }
+ void set_syllable (uint8_t syllable_) { syllable = per_syllable ? syllable_ : 0; }
void set_match_func (match_func_t match_func_,
const void *match_data_)
{ match_func = match_func_; match_data = match_data_; }
@@ -469,9 +469,10 @@ struct hb_ot_apply_context_t :
protected:
unsigned int lookup_props;
+ hb_mask_t mask;
bool ignore_zwnj;
bool ignore_zwj;
- hb_mask_t mask;
+ bool per_syllable;
uint8_t syllable;
match_func_t match_func;
const void *match_data;
@@ -490,6 +491,7 @@ struct hb_ot_apply_context_t :
/* Ignore ZWJ if we are matching context, or asked to. */
matcher.set_ignore_zwj (context_match || c->auto_zwj);
matcher.set_mask (context_match ? -1 : c->lookup_mask);
+ matcher.set_per_syllable (c->per_syllable);
}
void set_lookup_props (unsigned int lookup_props)
{
@@ -636,6 +638,7 @@ struct hb_ot_apply_context_t :
bool has_glyph_classes;
bool auto_zwnj;
bool auto_zwj;
+ bool per_syllable;
bool random;
uint32_t random_state;
@@ -664,6 +667,7 @@ struct hb_ot_apply_context_t :
has_glyph_classes (gdef.has_glyph_classes ()),
auto_zwnj (true),
auto_zwj (true),
+ per_syllable (false),
random (false),
random_state (1) { init_iters (); }
@@ -676,6 +680,7 @@ struct hb_ot_apply_context_t :
void set_lookup_mask (hb_mask_t mask) { lookup_mask = mask; init_iters (); }
void set_auto_zwj (bool auto_zwj_) { auto_zwj = auto_zwj_; init_iters (); }
void set_auto_zwnj (bool auto_zwnj_) { auto_zwnj = auto_zwnj_; init_iters (); }
+ void set_per_syllable (bool per_syllable_) { per_syllable = per_syllable_; init_iters (); }
void set_random (bool random_) { random = random_; }
void set_recurse_func (recurse_func_t func) { recurse_func = func; }
void set_lookup_index (unsigned int lookup_index_) { lookup_index = lookup_index_; }
@@ -1415,13 +1420,18 @@ static inline void apply_lookup (hb_ot_apply_context_t *c,
if (unlikely (idx == 0 && lookupRecord[i].lookupListIndex == c->lookup_index))
continue;
+ unsigned int orig_len = buffer->backtrack_len () + buffer->lookahead_len ();
+
+ /* This can happen if earlier recursed lookups deleted many entries. */
+ if (unlikely (match_positions[idx] >= orig_len))
+ continue;
+
if (unlikely (!buffer->move_to (match_positions[idx])))
break;
if (unlikely (buffer->max_ops <= 0))
break;
- unsigned int orig_len = buffer->backtrack_len () + buffer->lookahead_len ();
if (!c->recurse (lookupRecord[i].lookupListIndex))
continue;
@@ -1457,15 +1467,18 @@ static inline void apply_lookup (hb_ot_apply_context_t *c,
*/
end += delta;
- if (end <= int (match_positions[idx]))
+ if (end < int (match_positions[idx]))
{
/* End might end up being smaller than match_positions[idx] if the recursed
- * lookup ended up removing many items, more than we have had matched.
- * Just never rewind end back and get out of here.
- * https://bugs.chromium.org/p/chromium/issues/detail?id=659496 */
+ * lookup ended up removing many items.
+ * Just never rewind end beyond start of current position, since that is
+ * not possible in the recursed lookup. Also adjust delta as such.
+ *
+ * https://bugs.chromium.org/p/chromium/issues/detail?id=659496
+ * https://github.com/harfbuzz/harfbuzz/issues/1611
+ */
+ delta += match_positions[idx] - end;
end = match_positions[idx];
- /* There can't be any further changes. */
- break;
}
unsigned int next = idx + 1; /* next now is the position after the recursed lookup. */
@@ -1477,7 +1490,7 @@ static inline void apply_lookup (hb_ot_apply_context_t *c,
}
else
{
- /* NOTE: delta is negative. */
+ /* NOTE: delta is non-positive. */
delta = hb_max (delta, (int) next - (int) count);
next -= delta;
}