diff options
Diffstat (limited to 'src/3rdparty/harfbuzz-ng/src/hb-ot-shaper-arabic.cc')
| -rw-r--r-- | src/3rdparty/harfbuzz-ng/src/hb-ot-shaper-arabic.cc | 39 |
1 files changed, 29 insertions, 10 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-ot-shaper-arabic.cc b/src/3rdparty/harfbuzz-ng/src/hb-ot-shaper-arabic.cc index 256f8f1d14..d70746ed2b 100644 --- a/src/3rdparty/harfbuzz-ng/src/hb-ot-shaper-arabic.cc +++ b/src/3rdparty/harfbuzz-ng/src/hb-ot-shaper-arabic.cc @@ -486,8 +486,10 @@ apply_stch (const hb_ot_shape_plan_t *plan HB_UNUSED, if (likely (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_ARABIC_HAS_STCH))) return; - /* The Arabic shaper currently always processes in RTL mode, so we should - * stretch / position the stretched pieces to the left / preceding glyphs. */ + bool rtl = buffer->props.direction == HB_DIRECTION_RTL; + + if (!rtl) + buffer->reverse (); /* We do a two pass implementation: * First pass calculates the exact number of extra glyphs we need, @@ -558,9 +560,9 @@ apply_stch (const hb_ot_shape_plan_t *plan HB_UNUSED, DEBUG_MSG (ARABIC, nullptr, "%s stretch at (%u,%u,%u)", step == MEASURE ? "measuring" : "cutting", context, start, end); - DEBUG_MSG (ARABIC, nullptr, "rest of word: count=%u width %d", start - context, w_total); - DEBUG_MSG (ARABIC, nullptr, "fixed tiles: count=%d width=%d", n_fixed, w_fixed); - DEBUG_MSG (ARABIC, nullptr, "repeating tiles: count=%d width=%d", n_repeating, w_repeating); + DEBUG_MSG (ARABIC, nullptr, "rest of word: count=%u width %" PRId32, start - context, w_total); + DEBUG_MSG (ARABIC, nullptr, "fixed tiles: count=%d width=%" PRId32, n_fixed, w_fixed); + DEBUG_MSG (ARABIC, nullptr, "repeating tiles: count=%d width=%" PRId32, n_repeating, w_repeating); /* Number of additional times to repeat each repeating tile. */ int n_copies = 0; @@ -577,7 +579,10 @@ apply_stch (const hb_ot_shape_plan_t *plan HB_UNUSED, ++n_copies; hb_position_t excess = (n_copies + 1) * sign * w_repeating - sign * w_remaining; if (excess > 0) + { extra_repeat_overlap = excess / (n_copies * n_repeating); + w_remaining = 0; + } } if (step == MEASURE) @@ -588,7 +593,7 @@ apply_stch (const hb_ot_shape_plan_t *plan HB_UNUSED, else { buffer->unsafe_to_break (context, end); - hb_position_t x_offset = 0; + hb_position_t x_offset = w_remaining / 2; for (unsigned int k = end; k > start; k--) { hb_position_t width = font->get_glyph_h_advance (info[k - 1].codepoint); @@ -597,18 +602,29 @@ apply_stch (const hb_ot_shape_plan_t *plan HB_UNUSED, if (info[k - 1].arabic_shaping_action() == STCH_REPEATING) repeat += n_copies; - DEBUG_MSG (ARABIC, nullptr, "appending %u copies of glyph %u; j=%u", + DEBUG_MSG (ARABIC, nullptr, "appending %u copies of glyph %" PRIu32 "; j=%u", repeat, info[k - 1].codepoint, j); + pos[k - 1].x_advance = 0; for (unsigned int n = 0; n < repeat; n++) { - x_offset -= width; - if (n > 0) - x_offset += extra_repeat_overlap; + if (rtl) + { + x_offset -= width; + if (n > 0) + x_offset += extra_repeat_overlap; + } pos[k - 1].x_offset = x_offset; /* Append copy. */ --j; info[j] = info[k - 1]; pos[j] = pos[k - 1]; + + if (!rtl) + { + x_offset += width; + if (n > 0) + x_offset -= extra_repeat_overlap; + } } } } @@ -625,6 +641,9 @@ apply_stch (const hb_ot_shape_plan_t *plan HB_UNUSED, buffer->len = new_len; } } + + if (!rtl) + buffer->reverse (); } |