diff options
Diffstat (limited to 'thirdparty/harfbuzz/src/hb-ot-shape.cc')
| -rw-r--r-- | thirdparty/harfbuzz/src/hb-ot-shape.cc | 29 |
1 files changed, 26 insertions, 3 deletions
diff --git a/thirdparty/harfbuzz/src/hb-ot-shape.cc b/thirdparty/harfbuzz/src/hb-ot-shape.cc index 2ada84b8a3..7f679cfd39 100644 --- a/thirdparty/harfbuzz/src/hb-ot-shape.cc +++ b/thirdparty/harfbuzz/src/hb-ot-shape.cc @@ -1141,6 +1141,18 @@ hb_propagate_flags (hb_buffer_t *buffer) if (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_GLYPH_FLAGS)) return; + /* If we are producing SAFE_TO_INSERT_TATWEEL, then do two things: + * + * - If the places that the Arabic shaper marked as SAFE_TO_INSERT_TATWEEL, + * are UNSAFE_TO_BREAK, then clear the SAFE_TO_INSERT_TATWEEL, + * - Any place that is SAFE_TO_INSERT_TATWEEL, is also now UNSAFE_TO_BREAK. + * + * We couldn't make this interaction earlier. It has to be done here. + */ + bool flip_tatweel = buffer->flags & HB_BUFFER_FLAG_PRODUCE_SAFE_TO_INSERT_TATWEEL; + + bool clear_concat = (buffer->flags & HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT) == 0; + hb_glyph_info_t *info = buffer->info; foreach_cluster (buffer, start, end) @@ -1148,9 +1160,20 @@ hb_propagate_flags (hb_buffer_t *buffer) unsigned int mask = 0; for (unsigned int i = start; i < end; i++) mask |= info[i].mask & HB_GLYPH_FLAG_DEFINED; - if (mask) - for (unsigned int i = start; i < end; i++) - info[i].mask |= mask; + + if (flip_tatweel) + { + if (mask & HB_GLYPH_FLAG_UNSAFE_TO_BREAK) + mask &= ~HB_GLYPH_FLAG_SAFE_TO_INSERT_TATWEEL; + if (mask & HB_GLYPH_FLAG_SAFE_TO_INSERT_TATWEEL) + mask |= HB_GLYPH_FLAG_UNSAFE_TO_BREAK | HB_GLYPH_FLAG_UNSAFE_TO_CONCAT; + } + + if (clear_concat) + mask &= ~HB_GLYPH_FLAG_UNSAFE_TO_CONCAT; + + for (unsigned int i = start; i < end; i++) + info[i].mask = mask; } } |