--- old/src/java.desktop/share/native/libfontmanager/harfbuzz/hb-ot-shape-complex-khmer.cc 2020-07-21 14:25:57.386861397 -0700 +++ /dev/null 2020-01-23 11:31:37.155195123 -0800 @@ -1,501 +0,0 @@ -/* - * Copyright © 2011,2012 Google, Inc. - * - * This is part of HarfBuzz, a text shaping library. - * - * Permission is hereby granted, without written agreement and without - * license or royalty fees, to use, copy, modify, and distribute this - * software and its documentation for any purpose, provided that the - * above copyright notice and the following two paragraphs appear in - * all copies of this software. - * - * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR - * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES - * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN - * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH - * DAMAGE. - * - * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, - * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND - * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS - * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO - * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. - * - * Google Author(s): Behdad Esfahbod - */ - -#include "hb-ot-shape-complex-khmer.hh" -#include "hb-ot-layout.hh" - - -/* - * Khmer shaper. - */ - -static const hb_ot_map_feature_t -khmer_features[] = -{ - /* - * Basic features. - * These features are applied in order, one at a time, after reordering. - */ - {HB_TAG('p','r','e','f'), F_MANUAL_JOINERS}, - {HB_TAG('b','l','w','f'), F_MANUAL_JOINERS}, - {HB_TAG('a','b','v','f'), F_MANUAL_JOINERS}, - {HB_TAG('p','s','t','f'), F_MANUAL_JOINERS}, - {HB_TAG('c','f','a','r'), F_MANUAL_JOINERS}, - /* - * Other features. - * These features are applied all at once after clearing syllables. - */ - {HB_TAG('p','r','e','s'), F_GLOBAL_MANUAL_JOINERS}, - {HB_TAG('a','b','v','s'), F_GLOBAL_MANUAL_JOINERS}, - {HB_TAG('b','l','w','s'), F_GLOBAL_MANUAL_JOINERS}, - {HB_TAG('p','s','t','s'), F_GLOBAL_MANUAL_JOINERS}, - /* - * Positioning features. - * We don't care about the types. - */ - {HB_TAG('d','i','s','t'), F_GLOBAL}, - {HB_TAG('a','b','v','m'), F_GLOBAL}, - {HB_TAG('b','l','w','m'), F_GLOBAL}, -}; - -/* - * Must be in the same order as the khmer_features array. - */ -enum { - PREF, - BLWF, - ABVF, - PSTF, - CFAR, - - _PRES, - _ABVS, - _BLWS, - _PSTS, - - _DIST, - _ABVM, - _BLWM, - - KHMER_NUM_FEATURES, - KHMER_BASIC_FEATURES = _PRES, /* Don't forget to update this! */ -}; - -static void -setup_syllables (const hb_ot_shape_plan_t *plan, - hb_font_t *font, - hb_buffer_t *buffer); -static void -reorder (const hb_ot_shape_plan_t *plan, - hb_font_t *font, - hb_buffer_t *buffer); -static void -clear_syllables (const hb_ot_shape_plan_t *plan, - hb_font_t *font, - hb_buffer_t *buffer); - -static void -collect_features_khmer (hb_ot_shape_planner_t *plan) -{ - hb_ot_map_builder_t *map = &plan->map; - - /* Do this before any lookups have been applied. */ - map->add_gsub_pause (setup_syllables); - map->add_gsub_pause (reorder); - - /* Testing suggests that Uniscribe does NOT pause between basic - * features. Test with KhmerUI.ttf and the following three - * sequences: - * - * U+1789,U+17BC - * U+1789,U+17D2,U+1789 - * U+1789,U+17D2,U+1789,U+17BC - * - * https://github.com/harfbuzz/harfbuzz/issues/974 - */ - map->enable_feature (HB_TAG('l','o','c','l')); - map->enable_feature (HB_TAG('c','c','m','p')); - - unsigned int i = 0; - for (; i < KHMER_BASIC_FEATURES; i++) - map->add_feature (khmer_features[i]); - - map->add_gsub_pause (clear_syllables); - - for (; i < KHMER_NUM_FEATURES; i++) - map->add_feature (khmer_features[i]); -} - -static void -override_features_khmer (hb_ot_shape_planner_t *plan) -{ - hb_ot_map_builder_t *map = &plan->map; - - /* Khmer spec has 'clig' as part of required shaping features: - * "Apply feature 'clig' to form ligatures that are desired for - * typographical correctness.", hence in overrides... */ - map->enable_feature (HB_TAG('c','l','i','g')); - - /* Uniscribe does not apply 'kern' in Khmer. */ - if (hb_options ().uniscribe_bug_compatible) - { - map->disable_feature (HB_TAG('k','e','r','n')); - } - - map->disable_feature (HB_TAG('l','i','g','a')); -} - - -struct would_substitute_feature_t -{ - void init (const hb_ot_map_t *map, hb_tag_t feature_tag, bool zero_context_) - { - zero_context = zero_context_; - map->get_stage_lookups (0/*GSUB*/, - map->get_feature_stage (0/*GSUB*/, feature_tag), - &lookups, &count); - } - - bool would_substitute (const hb_codepoint_t *glyphs, - unsigned int glyphs_count, - hb_face_t *face) const - { - for (unsigned int i = 0; i < count; i++) - if (hb_ot_layout_lookup_would_substitute_fast (face, lookups[i].index, glyphs, glyphs_count, zero_context)) - return true; - return false; - } - - private: - const hb_ot_map_t::lookup_map_t *lookups; - unsigned int count; - bool zero_context; -}; - -struct khmer_shape_plan_t -{ - bool get_virama_glyph (hb_font_t *font, hb_codepoint_t *pglyph) const - { - hb_codepoint_t glyph = virama_glyph; - if (unlikely (virama_glyph == (hb_codepoint_t) -1)) - { - if (!font->get_nominal_glyph (0x17D2u, &glyph)) - glyph = 0; - /* Technically speaking, the spec says we should apply 'locl' to virama too. - * Maybe one day... */ - - /* Our get_nominal_glyph() function needs a font, so we can't get the virama glyph - * during shape planning... Instead, overwrite it here. It's safe. Don't worry! */ - virama_glyph = glyph; - } - - *pglyph = glyph; - return glyph != 0; - } - - mutable hb_codepoint_t virama_glyph; - - would_substitute_feature_t pref; - - hb_mask_t mask_array[KHMER_NUM_FEATURES]; -}; - -static void * -data_create_khmer (const hb_ot_shape_plan_t *plan) -{ - khmer_shape_plan_t *khmer_plan = (khmer_shape_plan_t *) calloc (1, sizeof (khmer_shape_plan_t)); - if (unlikely (!khmer_plan)) - return nullptr; - - khmer_plan->virama_glyph = (hb_codepoint_t) -1; - - khmer_plan->pref.init (&plan->map, HB_TAG('p','r','e','f'), true); - - for (unsigned int i = 0; i < ARRAY_LENGTH (khmer_plan->mask_array); i++) - khmer_plan->mask_array[i] = (khmer_features[i].flags & F_GLOBAL) ? - 0 : plan->map.get_1_mask (khmer_features[i].tag); - - return khmer_plan; -} - -static void -data_destroy_khmer (void *data) -{ - free (data); -} - - -enum syllable_type_t { - consonant_syllable, - broken_cluster, - non_khmer_cluster, -}; - -#include "hb-ot-shape-complex-khmer-machine.hh" - -static void -setup_masks_khmer (const hb_ot_shape_plan_t *plan HB_UNUSED, - hb_buffer_t *buffer, - hb_font_t *font HB_UNUSED) -{ - HB_BUFFER_ALLOCATE_VAR (buffer, khmer_category); - - /* We cannot setup masks here. We save information about characters - * and setup masks later on in a pause-callback. */ - - unsigned int count = buffer->len; - hb_glyph_info_t *info = buffer->info; - for (unsigned int i = 0; i < count; i++) - set_khmer_properties (info[i]); -} - -static void -setup_syllables (const hb_ot_shape_plan_t *plan HB_UNUSED, - hb_font_t *font HB_UNUSED, - hb_buffer_t *buffer) -{ - find_syllables (buffer); - foreach_syllable (buffer, start, end) - buffer->unsafe_to_break (start, end); -} - - -/* Rules from: - * https://docs.microsoft.com/en-us/typography/script-development/devanagari */ - -static void -reorder_consonant_syllable (const hb_ot_shape_plan_t *plan, - hb_face_t *face HB_UNUSED, - hb_buffer_t *buffer, - unsigned int start, unsigned int end) -{ - const khmer_shape_plan_t *khmer_plan = (const khmer_shape_plan_t *) plan->data; - hb_glyph_info_t *info = buffer->info; - - /* Setup masks. */ - { - /* Post-base */ - hb_mask_t mask = khmer_plan->mask_array[BLWF] | khmer_plan->mask_array[ABVF] | khmer_plan->mask_array[PSTF]; - for (unsigned int i = start + 1; i < end; i++) - info[i].mask |= mask; - } - - unsigned int num_coengs = 0; - for (unsigned int i = start + 1; i < end; i++) - { - /* """ - * When a COENG + (Cons | IndV) combination are found (and subscript count - * is less than two) the character combination is handled according to the - * subscript type of the character following the COENG. - * - * ... - * - * Subscript Type 2 - The COENG + RO characters are reordered to immediately - * before the base glyph. Then the COENG + RO characters are assigned to have - * the 'pref' OpenType feature applied to them. - * """ - */ - if (info[i].khmer_category() == OT_Coeng && num_coengs <= 2 && i + 1 < end) - { - num_coengs++; - - if (info[i + 1].khmer_category() == OT_Ra) - { - for (unsigned int j = 0; j < 2; j++) - info[i + j].mask |= khmer_plan->mask_array[PREF]; - - /* Move the Coeng,Ro sequence to the start. */ - buffer->merge_clusters (start, i + 2); - hb_glyph_info_t t0 = info[i]; - hb_glyph_info_t t1 = info[i + 1]; - memmove (&info[start + 2], &info[start], (i - start) * sizeof (info[0])); - info[start] = t0; - info[start + 1] = t1; - - /* Mark the subsequent stuff with 'cfar'. Used in Khmer. - * Read the feature spec. - * This allows distinguishing the following cases with MS Khmer fonts: - * U+1784,U+17D2,U+179A,U+17D2,U+1782 - * U+1784,U+17D2,U+1782,U+17D2,U+179A - */ - if (khmer_plan->mask_array[CFAR]) - for (unsigned int j = i + 2; j < end; j++) - info[j].mask |= khmer_plan->mask_array[CFAR]; - - num_coengs = 2; /* Done. */ - } - } - - /* Reorder left matra piece. */ - else if (info[i].khmer_category() == OT_VPre) - { - /* Move to the start. */ - buffer->merge_clusters (start, i + 1); - hb_glyph_info_t t = info[i]; - memmove (&info[start + 1], &info[start], (i - start) * sizeof (info[0])); - info[start] = t; - } - } -} - -static void -initial_reordering_syllable (const hb_ot_shape_plan_t *plan, - hb_face_t *face, - hb_buffer_t *buffer, - unsigned int start, unsigned int end) -{ - syllable_type_t syllable_type = (syllable_type_t) (buffer->info[start].syllable() & 0x0F); - switch (syllable_type) - { - case broken_cluster: /* We already inserted dotted-circles, so just call the consonant_syllable. */ - case consonant_syllable: - reorder_consonant_syllable (plan, face, buffer, start, end); - break; - - case non_khmer_cluster: - break; - } -} - -static inline void -insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED, - hb_font_t *font, - hb_buffer_t *buffer) -{ - /* Note: This loop is extra overhead, but should not be measurable. */ - 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) == 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_khmer_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(); - syllable_type_t syllable_type = (syllable_type_t) (syllable & 0x0F); - if (unlikely (last_syllable != syllable && syllable_type == 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(); - /* TODO Set glyph_props? */ - - /* Insert dottedcircle after possible Repha. */ - while (buffer->idx < buffer->len && buffer->successful && - last_syllable == buffer->cur().syllable() && - buffer->cur().khmer_category() == OT_Repha) - buffer->next_glyph (); - - buffer->output_info (ginfo); - } - else - buffer->next_glyph (); - } - buffer->swap_buffers (); -} - -static void -reorder (const hb_ot_shape_plan_t *plan, - hb_font_t *font, - hb_buffer_t *buffer) -{ - insert_dotted_circles (plan, font, buffer); - - foreach_syllable (buffer, start, end) - initial_reordering_syllable (plan, font->face, buffer, start, end); - - HB_BUFFER_DEALLOCATE_VAR (buffer, khmer_category); -} - -static void -clear_syllables (const hb_ot_shape_plan_t *plan HB_UNUSED, - hb_font_t *font HB_UNUSED, - hb_buffer_t *buffer) -{ - hb_glyph_info_t *info = buffer->info; - unsigned int count = buffer->len; - for (unsigned int i = 0; i < count; i++) - info[i].syllable() = 0; -} - - -static bool -decompose_khmer (const hb_ot_shape_normalize_context_t *c, - hb_codepoint_t ab, - hb_codepoint_t *a, - hb_codepoint_t *b) -{ - switch (ab) - { - /* - * Decompose split matras that don't have Unicode decompositions. - */ - - /* Khmer */ - case 0x17BEu : *a = 0x17C1u; *b= 0x17BEu; return true; - case 0x17BFu : *a = 0x17C1u; *b= 0x17BFu; return true; - case 0x17C0u : *a = 0x17C1u; *b= 0x17C0u; return true; - case 0x17C4u : *a = 0x17C1u; *b= 0x17C4u; return true; - case 0x17C5u : *a = 0x17C1u; *b= 0x17C5u; return true; - } - - return (bool) c->unicode->decompose (ab, a, b); -} - -static bool -compose_khmer (const hb_ot_shape_normalize_context_t *c, - hb_codepoint_t a, - hb_codepoint_t b, - hb_codepoint_t *ab) -{ - /* Avoid recomposing split matras. */ - if (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (c->unicode->general_category (a))) - return false; - - return (bool) c->unicode->compose (a, b, ab); -} - - -const hb_ot_complex_shaper_t _hb_ot_complex_shaper_khmer = -{ - collect_features_khmer, - override_features_khmer, - data_create_khmer, - data_destroy_khmer, - nullptr, /* preprocess_text */ - nullptr, /* postprocess_glyphs */ - HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT, - decompose_khmer, - compose_khmer, - setup_masks_khmer, - HB_TAG_NONE, /* gpos_tag */ - nullptr, /* reorder_marks */ - HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE, - false, /* fallback_position */ -}; --- /dev/null 2020-01-23 11:31:37.155195123 -0800 +++ new/src/java.desktop/share/native/libharfbuzz/hb-ot-shape-complex-khmer.cc 2020-07-21 14:25:57.034861403 -0700 @@ -0,0 +1,501 @@ +/* + * Copyright © 2011,2012 Google, Inc. + * + * This is part of HarfBuzz, a text shaping library. + * + * Permission is hereby granted, without written agreement and without + * license or royalty fees, to use, copy, modify, and distribute this + * software and its documentation for any purpose, provided that the + * above copyright notice and the following two paragraphs appear in + * all copies of this software. + * + * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR + * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES + * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN + * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH + * DAMAGE. + * + * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND + * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS + * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO + * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. + * + * Google Author(s): Behdad Esfahbod + */ + +#include "hb-ot-shape-complex-khmer.hh" +#include "hb-ot-layout.hh" + + +/* + * Khmer shaper. + */ + +static const hb_ot_map_feature_t +khmer_features[] = +{ + /* + * Basic features. + * These features are applied in order, one at a time, after reordering. + */ + {HB_TAG('p','r','e','f'), F_MANUAL_JOINERS}, + {HB_TAG('b','l','w','f'), F_MANUAL_JOINERS}, + {HB_TAG('a','b','v','f'), F_MANUAL_JOINERS}, + {HB_TAG('p','s','t','f'), F_MANUAL_JOINERS}, + {HB_TAG('c','f','a','r'), F_MANUAL_JOINERS}, + /* + * Other features. + * These features are applied all at once after clearing syllables. + */ + {HB_TAG('p','r','e','s'), F_GLOBAL_MANUAL_JOINERS}, + {HB_TAG('a','b','v','s'), F_GLOBAL_MANUAL_JOINERS}, + {HB_TAG('b','l','w','s'), F_GLOBAL_MANUAL_JOINERS}, + {HB_TAG('p','s','t','s'), F_GLOBAL_MANUAL_JOINERS}, + /* + * Positioning features. + * We don't care about the types. + */ + {HB_TAG('d','i','s','t'), F_GLOBAL}, + {HB_TAG('a','b','v','m'), F_GLOBAL}, + {HB_TAG('b','l','w','m'), F_GLOBAL}, +}; + +/* + * Must be in the same order as the khmer_features array. + */ +enum { + PREF, + BLWF, + ABVF, + PSTF, + CFAR, + + _PRES, + _ABVS, + _BLWS, + _PSTS, + + _DIST, + _ABVM, + _BLWM, + + KHMER_NUM_FEATURES, + KHMER_BASIC_FEATURES = _PRES, /* Don't forget to update this! */ +}; + +static void +setup_syllables (const hb_ot_shape_plan_t *plan, + hb_font_t *font, + hb_buffer_t *buffer); +static void +reorder (const hb_ot_shape_plan_t *plan, + hb_font_t *font, + hb_buffer_t *buffer); +static void +clear_syllables (const hb_ot_shape_plan_t *plan, + hb_font_t *font, + hb_buffer_t *buffer); + +static void +collect_features_khmer (hb_ot_shape_planner_t *plan) +{ + hb_ot_map_builder_t *map = &plan->map; + + /* Do this before any lookups have been applied. */ + map->add_gsub_pause (setup_syllables); + map->add_gsub_pause (reorder); + + /* Testing suggests that Uniscribe does NOT pause between basic + * features. Test with KhmerUI.ttf and the following three + * sequences: + * + * U+1789,U+17BC + * U+1789,U+17D2,U+1789 + * U+1789,U+17D2,U+1789,U+17BC + * + * https://github.com/harfbuzz/harfbuzz/issues/974 + */ + map->enable_feature (HB_TAG('l','o','c','l')); + map->enable_feature (HB_TAG('c','c','m','p')); + + unsigned int i = 0; + for (; i < KHMER_BASIC_FEATURES; i++) + map->add_feature (khmer_features[i]); + + map->add_gsub_pause (clear_syllables); + + for (; i < KHMER_NUM_FEATURES; i++) + map->add_feature (khmer_features[i]); +} + +static void +override_features_khmer (hb_ot_shape_planner_t *plan) +{ + hb_ot_map_builder_t *map = &plan->map; + + /* Khmer spec has 'clig' as part of required shaping features: + * "Apply feature 'clig' to form ligatures that are desired for + * typographical correctness.", hence in overrides... */ + map->enable_feature (HB_TAG('c','l','i','g')); + + /* Uniscribe does not apply 'kern' in Khmer. */ + if (hb_options ().uniscribe_bug_compatible) + { + map->disable_feature (HB_TAG('k','e','r','n')); + } + + map->disable_feature (HB_TAG('l','i','g','a')); +} + + +struct would_substitute_feature_t +{ + void init (const hb_ot_map_t *map, hb_tag_t feature_tag, bool zero_context_) + { + zero_context = zero_context_; + map->get_stage_lookups (0/*GSUB*/, + map->get_feature_stage (0/*GSUB*/, feature_tag), + &lookups, &count); + } + + bool would_substitute (const hb_codepoint_t *glyphs, + unsigned int glyphs_count, + hb_face_t *face) const + { + for (unsigned int i = 0; i < count; i++) + if (hb_ot_layout_lookup_would_substitute_fast (face, lookups[i].index, glyphs, glyphs_count, zero_context)) + return true; + return false; + } + + private: + const hb_ot_map_t::lookup_map_t *lookups; + unsigned int count; + bool zero_context; +}; + +struct khmer_shape_plan_t +{ + bool get_virama_glyph (hb_font_t *font, hb_codepoint_t *pglyph) const + { + hb_codepoint_t glyph = virama_glyph; + if (unlikely (virama_glyph == (hb_codepoint_t) -1)) + { + if (!font->get_nominal_glyph (0x17D2u, &glyph)) + glyph = 0; + /* Technically speaking, the spec says we should apply 'locl' to virama too. + * Maybe one day... */ + + /* Our get_nominal_glyph() function needs a font, so we can't get the virama glyph + * during shape planning... Instead, overwrite it here. It's safe. Don't worry! */ + virama_glyph = glyph; + } + + *pglyph = glyph; + return glyph != 0; + } + + mutable hb_codepoint_t virama_glyph; + + would_substitute_feature_t pref; + + hb_mask_t mask_array[KHMER_NUM_FEATURES]; +}; + +static void * +data_create_khmer (const hb_ot_shape_plan_t *plan) +{ + khmer_shape_plan_t *khmer_plan = (khmer_shape_plan_t *) calloc (1, sizeof (khmer_shape_plan_t)); + if (unlikely (!khmer_plan)) + return nullptr; + + khmer_plan->virama_glyph = (hb_codepoint_t) -1; + + khmer_plan->pref.init (&plan->map, HB_TAG('p','r','e','f'), true); + + for (unsigned int i = 0; i < ARRAY_LENGTH (khmer_plan->mask_array); i++) + khmer_plan->mask_array[i] = (khmer_features[i].flags & F_GLOBAL) ? + 0 : plan->map.get_1_mask (khmer_features[i].tag); + + return khmer_plan; +} + +static void +data_destroy_khmer (void *data) +{ + free (data); +} + + +enum syllable_type_t { + consonant_syllable, + broken_cluster, + non_khmer_cluster, +}; + +#include "hb-ot-shape-complex-khmer-machine.hh" + +static void +setup_masks_khmer (const hb_ot_shape_plan_t *plan HB_UNUSED, + hb_buffer_t *buffer, + hb_font_t *font HB_UNUSED) +{ + HB_BUFFER_ALLOCATE_VAR (buffer, khmer_category); + + /* We cannot setup masks here. We save information about characters + * and setup masks later on in a pause-callback. */ + + unsigned int count = buffer->len; + hb_glyph_info_t *info = buffer->info; + for (unsigned int i = 0; i < count; i++) + set_khmer_properties (info[i]); +} + +static void +setup_syllables (const hb_ot_shape_plan_t *plan HB_UNUSED, + hb_font_t *font HB_UNUSED, + hb_buffer_t *buffer) +{ + find_syllables (buffer); + foreach_syllable (buffer, start, end) + buffer->unsafe_to_break (start, end); +} + + +/* Rules from: + * https://docs.microsoft.com/en-us/typography/script-development/devanagari */ + +static void +reorder_consonant_syllable (const hb_ot_shape_plan_t *plan, + hb_face_t *face HB_UNUSED, + hb_buffer_t *buffer, + unsigned int start, unsigned int end) +{ + const khmer_shape_plan_t *khmer_plan = (const khmer_shape_plan_t *) plan->data; + hb_glyph_info_t *info = buffer->info; + + /* Setup masks. */ + { + /* Post-base */ + hb_mask_t mask = khmer_plan->mask_array[BLWF] | khmer_plan->mask_array[ABVF] | khmer_plan->mask_array[PSTF]; + for (unsigned int i = start + 1; i < end; i++) + info[i].mask |= mask; + } + + unsigned int num_coengs = 0; + for (unsigned int i = start + 1; i < end; i++) + { + /* """ + * When a COENG + (Cons | IndV) combination are found (and subscript count + * is less than two) the character combination is handled according to the + * subscript type of the character following the COENG. + * + * ... + * + * Subscript Type 2 - The COENG + RO characters are reordered to immediately + * before the base glyph. Then the COENG + RO characters are assigned to have + * the 'pref' OpenType feature applied to them. + * """ + */ + if (info[i].khmer_category() == OT_Coeng && num_coengs <= 2 && i + 1 < end) + { + num_coengs++; + + if (info[i + 1].khmer_category() == OT_Ra) + { + for (unsigned int j = 0; j < 2; j++) + info[i + j].mask |= khmer_plan->mask_array[PREF]; + + /* Move the Coeng,Ro sequence to the start. */ + buffer->merge_clusters (start, i + 2); + hb_glyph_info_t t0 = info[i]; + hb_glyph_info_t t1 = info[i + 1]; + memmove (&info[start + 2], &info[start], (i - start) * sizeof (info[0])); + info[start] = t0; + info[start + 1] = t1; + + /* Mark the subsequent stuff with 'cfar'. Used in Khmer. + * Read the feature spec. + * This allows distinguishing the following cases with MS Khmer fonts: + * U+1784,U+17D2,U+179A,U+17D2,U+1782 + * U+1784,U+17D2,U+1782,U+17D2,U+179A + */ + if (khmer_plan->mask_array[CFAR]) + for (unsigned int j = i + 2; j < end; j++) + info[j].mask |= khmer_plan->mask_array[CFAR]; + + num_coengs = 2; /* Done. */ + } + } + + /* Reorder left matra piece. */ + else if (info[i].khmer_category() == OT_VPre) + { + /* Move to the start. */ + buffer->merge_clusters (start, i + 1); + hb_glyph_info_t t = info[i]; + memmove (&info[start + 1], &info[start], (i - start) * sizeof (info[0])); + info[start] = t; + } + } +} + +static void +initial_reordering_syllable (const hb_ot_shape_plan_t *plan, + hb_face_t *face, + hb_buffer_t *buffer, + unsigned int start, unsigned int end) +{ + syllable_type_t syllable_type = (syllable_type_t) (buffer->info[start].syllable() & 0x0F); + switch (syllable_type) + { + case broken_cluster: /* We already inserted dotted-circles, so just call the consonant_syllable. */ + case consonant_syllable: + reorder_consonant_syllable (plan, face, buffer, start, end); + break; + + case non_khmer_cluster: + break; + } +} + +static inline void +insert_dotted_circles (const hb_ot_shape_plan_t *plan HB_UNUSED, + hb_font_t *font, + hb_buffer_t *buffer) +{ + /* Note: This loop is extra overhead, but should not be measurable. */ + 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) == 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_khmer_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(); + syllable_type_t syllable_type = (syllable_type_t) (syllable & 0x0F); + if (unlikely (last_syllable != syllable && syllable_type == 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(); + /* TODO Set glyph_props? */ + + /* Insert dottedcircle after possible Repha. */ + while (buffer->idx < buffer->len && buffer->successful && + last_syllable == buffer->cur().syllable() && + buffer->cur().khmer_category() == OT_Repha) + buffer->next_glyph (); + + buffer->output_info (ginfo); + } + else + buffer->next_glyph (); + } + buffer->swap_buffers (); +} + +static void +reorder (const hb_ot_shape_plan_t *plan, + hb_font_t *font, + hb_buffer_t *buffer) +{ + insert_dotted_circles (plan, font, buffer); + + foreach_syllable (buffer, start, end) + initial_reordering_syllable (plan, font->face, buffer, start, end); + + HB_BUFFER_DEALLOCATE_VAR (buffer, khmer_category); +} + +static void +clear_syllables (const hb_ot_shape_plan_t *plan HB_UNUSED, + hb_font_t *font HB_UNUSED, + hb_buffer_t *buffer) +{ + hb_glyph_info_t *info = buffer->info; + unsigned int count = buffer->len; + for (unsigned int i = 0; i < count; i++) + info[i].syllable() = 0; +} + + +static bool +decompose_khmer (const hb_ot_shape_normalize_context_t *c, + hb_codepoint_t ab, + hb_codepoint_t *a, + hb_codepoint_t *b) +{ + switch (ab) + { + /* + * Decompose split matras that don't have Unicode decompositions. + */ + + /* Khmer */ + case 0x17BEu : *a = 0x17C1u; *b= 0x17BEu; return true; + case 0x17BFu : *a = 0x17C1u; *b= 0x17BFu; return true; + case 0x17C0u : *a = 0x17C1u; *b= 0x17C0u; return true; + case 0x17C4u : *a = 0x17C1u; *b= 0x17C4u; return true; + case 0x17C5u : *a = 0x17C1u; *b= 0x17C5u; return true; + } + + return (bool) c->unicode->decompose (ab, a, b); +} + +static bool +compose_khmer (const hb_ot_shape_normalize_context_t *c, + hb_codepoint_t a, + hb_codepoint_t b, + hb_codepoint_t *ab) +{ + /* Avoid recomposing split matras. */ + if (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (c->unicode->general_category (a))) + return false; + + return (bool) c->unicode->compose (a, b, ab); +} + + +const hb_ot_complex_shaper_t _hb_ot_complex_shaper_khmer = +{ + collect_features_khmer, + override_features_khmer, + data_create_khmer, + data_destroy_khmer, + nullptr, /* preprocess_text */ + nullptr, /* postprocess_glyphs */ + HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT, + decompose_khmer, + compose_khmer, + setup_masks_khmer, + HB_TAG_NONE, /* gpos_tag */ + nullptr, /* reorder_marks */ + HB_OT_SHAPE_ZERO_WIDTH_MARKS_NONE, + false, /* fallback_position */ +};