diff options
Diffstat (limited to 'thirdparty/harfbuzz/src/hb-ot-shape-complex-indic.cc')
| -rw-r--r-- | thirdparty/harfbuzz/src/hb-ot-shape-complex-indic.cc | 122 |
1 files changed, 40 insertions, 82 deletions
diff --git a/thirdparty/harfbuzz/src/hb-ot-shape-complex-indic.cc b/thirdparty/harfbuzz/src/hb-ot-shape-complex-indic.cc index 34972f81e2..a4f2d9a847 100644 --- a/thirdparty/harfbuzz/src/hb-ot-shape-complex-indic.cc +++ b/thirdparty/harfbuzz/src/hb-ot-shape-complex-indic.cc @@ -29,6 +29,7 @@ #ifndef HB_NO_OT_SHAPE #include "hb-ot-shape-complex-indic.hh" +#include "hb-ot-shape-complex-indic-machine.hh" #include "hb-ot-shape-complex-vowel-constraints.hh" #include "hb-ot-layout.hh" @@ -337,19 +338,6 @@ consonant_position_from_face (const indic_shape_plan_t *indic_plan, return POS_BASE_C; } - -enum indic_syllable_type_t { - indic_consonant_syllable, - indic_vowel_syllable, - indic_standalone_cluster, - indic_symbol_cluster, - indic_broken_cluster, - indic_non_indic_cluster, -}; - -#include "hb-ot-shape-complex-indic-machine.hh" - - static void setup_masks_indic (const hb_ot_shape_plan_t *plan HB_UNUSED, hb_buffer_t *buffer, @@ -764,7 +752,28 @@ initial_reordering_consonant_syllable (const hb_ot_shape_plan_t *plan, * We could use buffer->sort() for this, if there was no special * reordering of pre-base stuff happening later... * We don't want to merge_clusters all of that, which buffer->sort() - * would. + * would. Here's a concrete example: + * + * Assume there's a pre-base consonant and explicit Halant before base, + * followed by a prebase-reordering (left) Matra: + * + * C,H,ZWNJ,B,M + * + * At this point in reordering we would have: + * + * M,C,H,ZWNJ,B + * + * whereas in final reordering we will bring the Matra closer to Base: + * + * C,H,ZWNJ,M,B + * + * That's why we don't want to merge-clusters anything before the Base + * at this point. But if something moved from after Base to before it, + * we should merge clusters from base to them. In final-reordering, we + * only move things around before base, and merge-clusters up to base. + * These two merge-clusters from the two sides of base will interlock + * to merge things correctly. See: + * https://github.com/harfbuzz/harfbuzz/issues/2272 */ if (indic_plan->is_old_spec || end - start > 127) buffer->merge_clusters (base, end); @@ -774,17 +783,18 @@ initial_reordering_consonant_syllable (const hb_ot_shape_plan_t *plan, for (unsigned int i = base; i < end; i++) if (info[i].syllable() != 255) { + unsigned int min = i; unsigned int max = i; unsigned int j = start + info[i].syllable(); while (j != i) { + min = hb_min (min, j); max = hb_max (max, j); unsigned int next = start + info[j].syllable(); info[j].syllable() = 255; /* So we don't process j later again. */ j = next; } - if (i != max) - buffer->merge_clusters (i, max + 1); + buffer->merge_clusters (hb_max (base, min), max + 1); } } @@ -938,79 +948,24 @@ initial_reordering_syllable_indic (const hb_ot_shape_plan_t *plan, } } -static inline void -insert_dotted_circles_indic (const hb_ot_shape_plan_t *plan HB_UNUSED, - hb_font_t *font, - hb_buffer_t *buffer) -{ - if (unlikely (buffer->flags & HB_BUFFER_FLAG_DO_NOT_INSERT_DOTTED_CIRCLE)) - return; - - /* Note: This loop is extra overhead, but should not be measurable. - * TODO Use a buffer scratch flag to remove the loop. */ - bool has_broken_syllables = false; - unsigned int count = buffer->len; - hb_glyph_info_t *info = buffer->info; - for (unsigned int i = 0; i < count; i++) - if ((info[i].syllable() & 0x0F) == indic_broken_cluster) - { - has_broken_syllables = true; - break; - } - if (likely (!has_broken_syllables)) - return; - - - hb_codepoint_t dottedcircle_glyph; - if (!font->get_nominal_glyph (0x25CCu, &dottedcircle_glyph)) - return; - - hb_glyph_info_t dottedcircle = {0}; - dottedcircle.codepoint = 0x25CCu; - set_indic_properties (dottedcircle); - dottedcircle.codepoint = dottedcircle_glyph; - - buffer->clear_output (); - - buffer->idx = 0; - unsigned int last_syllable = 0; - while (buffer->idx < buffer->len && buffer->successful) - { - unsigned int syllable = buffer->cur().syllable(); - indic_syllable_type_t syllable_type = (indic_syllable_type_t) (syllable & 0x0F); - if (unlikely (last_syllable != syllable && syllable_type == indic_broken_cluster)) - { - last_syllable = syllable; - - hb_glyph_info_t ginfo = dottedcircle; - ginfo.cluster = buffer->cur().cluster; - ginfo.mask = buffer->cur().mask; - ginfo.syllable() = buffer->cur().syllable(); - - /* Insert dottedcircle after possible Repha. */ - while (buffer->idx < buffer->len && buffer->successful && - last_syllable == buffer->cur().syllable() && - buffer->cur().indic_category() == OT_Repha) - buffer->next_glyph (); - - buffer->output_info (ginfo); - } - else - buffer->next_glyph (); - } - buffer->swap_buffers (); -} - static void initial_reordering_indic (const hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) { + if (!buffer->message (font, "start reordering indic initial")) + return; + update_consonant_positions_indic (plan, font, buffer); - insert_dotted_circles_indic (plan, font, buffer); + hb_syllabic_insert_dotted_circles (font, buffer, + indic_broken_cluster, + OT_DOTTEDCIRCLE, + OT_Repha); foreach_syllable (buffer, start, end) initial_reordering_syllable_indic (plan, font->face, buffer, start, end); + + (void) buffer->message (font, "end reordering indic initial"); } static void @@ -1485,8 +1440,11 @@ final_reordering_indic (const hb_ot_shape_plan_t *plan, unsigned int count = buffer->len; if (unlikely (!count)) return; - foreach_syllable (buffer, start, end) - final_reordering_syllable_indic (plan, buffer, start, end); + if (buffer->message (font, "start reordering indic final")) { + foreach_syllable (buffer, start, end) + final_reordering_syllable_indic (plan, buffer, start, end); + (void) buffer->message (font, "end reordering indic final"); + } HB_BUFFER_DEALLOCATE_VAR (buffer, indic_category); HB_BUFFER_DEALLOCATE_VAR (buffer, indic_position); |