diff options
| -rw-r--r-- | libass/ass.h | 5 | ||||
| -rw-r--r-- | libass/ass_shaper.c | 33 |
2 files changed, 23 insertions, 15 deletions
diff --git a/libass/ass.h b/libass/ass.h index ef3ff23..6f8a1bd 100644 --- a/libass/ass.h +++ b/libass/ass.h @@ -242,13 +242,14 @@ typedef enum { * When this feature is disabled, text is split into VSFilter-compatible * segments and text in each segment is processed in isolation. * Notably, this includes running the Unicode Bidirectional - * Algorithm within each run separately. + * Algorithm and shaping the text within each run separately. * The individual runs are then laid out left-to-right, * even if they contain right-to-left text. * * When this feature is enabled, each event's text is processed as a whole * (as far as possible). In particular, the Unicode Bidirectional - * Algorithm is run on the whole text. + * Algorithm is run on the whole text, and text is shaped across + * override tags. * * This is incompatible with VSFilter and disabled by default. * diff --git a/libass/ass_shaper.c b/libass/ass_shaper.c index b05a051..0c97ccc 100644 --- a/libass/ass_shaper.c +++ b/libass/ass_shaper.c @@ -703,19 +703,25 @@ static bool shape_harfbuzz(ASS_Shaper *shaper, GlyphInfo *glyphs, size_t len) level == shaper->emblevels[i + 1]) i++; - int lead_context = 0, trail_context = 0; - if (offset > 0 && !glyphs[offset].starts_new_run && - is_shaping_control(glyphs[offset - 1].symbol)) - lead_context = 1; - if (i < (len - 1) && !glyphs[i + 1].starts_new_run && - is_shaping_control(glyphs[i + 1].symbol)) - trail_context = 1; - hb_buffer_pre_allocate(buf, i - offset + 1); - hb_buffer_add_utf32(buf, - shaper->event_text + offset - lead_context, - i - offset + 1 + lead_context + trail_context, - lead_context, i - offset + 1); + + int lead_context = 0, trail_context = 0; + if (shaper->whole_text_layout) { + hb_buffer_add_utf32(buf, shaper->event_text, len, + offset, i - offset + 1); + } else { + if (offset > 0 && !glyphs[offset].starts_new_run && + is_shaping_control(glyphs[offset - 1].symbol)) + lead_context = 1; + if (i < (len - 1) && !glyphs[i + 1].starts_new_run && + is_shaping_control(glyphs[i + 1].symbol)) + trail_context = 1; + + hb_buffer_add_utf32(buf, + shaper->event_text + offset - lead_context, + i - offset + 1 + lead_context + trail_context, + lead_context, i - offset + 1); + } props.direction = FRIBIDI_LEVEL_IS_RTL(level) ? HB_DIRECTION_RTL : HB_DIRECTION_LTR; @@ -726,7 +732,8 @@ static bool shape_harfbuzz(ASS_Shaper *shaper, GlyphInfo *glyphs, size_t len) set_run_features(shaper, glyphs + offset); hb_shape(font, buf, shaper->features, shaper->n_features); - shape_harfbuzz_process_run(glyphs, buf, offset - lead_context); + shape_harfbuzz_process_run(glyphs, buf, + shaper->whole_text_layout ? 0 : offset - lead_context); hb_buffer_reset(buf); } |