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Diffstat (limited to 'src/3rdparty/harfbuzz-ng/src/hb-ot-shape-complex-thai.cc')
| -rw-r--r-- | src/3rdparty/harfbuzz-ng/src/hb-ot-shape-complex-thai.cc | 394 |
1 files changed, 0 insertions, 394 deletions
diff --git a/src/3rdparty/harfbuzz-ng/src/hb-ot-shape-complex-thai.cc b/src/3rdparty/harfbuzz-ng/src/hb-ot-shape-complex-thai.cc deleted file mode 100644 index 347ea2e7ac..0000000000 --- a/src/3rdparty/harfbuzz-ng/src/hb-ot-shape-complex-thai.cc +++ /dev/null @@ -1,394 +0,0 @@ -/* - * Copyright © 2010,2012 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.hh" - -#ifndef HB_NO_OT_SHAPE - -#include "hb-ot-shape-complex.hh" - - -/* Thai / Lao shaper */ - - -/* PUA shaping */ - - -enum thai_consonant_type_t -{ - NC, - AC, - RC, - DC, - NOT_CONSONANT, - NUM_CONSONANT_TYPES = NOT_CONSONANT -}; - -static thai_consonant_type_t -get_consonant_type (hb_codepoint_t u) -{ - if (u == 0x0E1Bu || u == 0x0E1Du || u == 0x0E1Fu/* || u == 0x0E2Cu*/) - return AC; - if (u == 0x0E0Du || u == 0x0E10u) - return RC; - if (u == 0x0E0Eu || u == 0x0E0Fu) - return DC; - if (hb_in_range<hb_codepoint_t> (u, 0x0E01u, 0x0E2Eu)) - return NC; - return NOT_CONSONANT; -} - - -enum thai_mark_type_t -{ - AV, - BV, - T, - NOT_MARK, - NUM_MARK_TYPES = NOT_MARK -}; - -static thai_mark_type_t -get_mark_type (hb_codepoint_t u) -{ - if (u == 0x0E31u || hb_in_range<hb_codepoint_t> (u, 0x0E34u, 0x0E37u) || - u == 0x0E47u || hb_in_range<hb_codepoint_t> (u, 0x0E4Du, 0x0E4Eu)) - return AV; - if (hb_in_range<hb_codepoint_t> (u, 0x0E38u, 0x0E3Au)) - return BV; - if (hb_in_range<hb_codepoint_t> (u, 0x0E48u, 0x0E4Cu)) - return T; - return NOT_MARK; -} - - -enum thai_action_t -{ - NOP, - SD, /* Shift combining-mark down */ - SL, /* Shift combining-mark left */ - SDL, /* Shift combining-mark down-left */ - RD /* Remove descender from base */ -}; - -static hb_codepoint_t -thai_pua_shape (hb_codepoint_t u, thai_action_t action, hb_font_t *font) -{ - struct thai_pua_mapping_t { - hb_codepoint_t u; - hb_codepoint_t win_pua; - hb_codepoint_t mac_pua; - } const *pua_mappings = nullptr; - static const thai_pua_mapping_t SD_mappings[] = { - {0x0E48u, 0xF70Au, 0xF88Bu}, /* MAI EK */ - {0x0E49u, 0xF70Bu, 0xF88Eu}, /* MAI THO */ - {0x0E4Au, 0xF70Cu, 0xF891u}, /* MAI TRI */ - {0x0E4Bu, 0xF70Du, 0xF894u}, /* MAI CHATTAWA */ - {0x0E4Cu, 0xF70Eu, 0xF897u}, /* THANTHAKHAT */ - {0x0E38u, 0xF718u, 0xF89Bu}, /* SARA U */ - {0x0E39u, 0xF719u, 0xF89Cu}, /* SARA UU */ - {0x0E3Au, 0xF71Au, 0xF89Du}, /* PHINTHU */ - {0x0000u, 0x0000u, 0x0000u} - }; - static const thai_pua_mapping_t SDL_mappings[] = { - {0x0E48u, 0xF705u, 0xF88Cu}, /* MAI EK */ - {0x0E49u, 0xF706u, 0xF88Fu}, /* MAI THO */ - {0x0E4Au, 0xF707u, 0xF892u}, /* MAI TRI */ - {0x0E4Bu, 0xF708u, 0xF895u}, /* MAI CHATTAWA */ - {0x0E4Cu, 0xF709u, 0xF898u}, /* THANTHAKHAT */ - {0x0000u, 0x0000u, 0x0000u} - }; - static const thai_pua_mapping_t SL_mappings[] = { - {0x0E48u, 0xF713u, 0xF88Au}, /* MAI EK */ - {0x0E49u, 0xF714u, 0xF88Du}, /* MAI THO */ - {0x0E4Au, 0xF715u, 0xF890u}, /* MAI TRI */ - {0x0E4Bu, 0xF716u, 0xF893u}, /* MAI CHATTAWA */ - {0x0E4Cu, 0xF717u, 0xF896u}, /* THANTHAKHAT */ - {0x0E31u, 0xF710u, 0xF884u}, /* MAI HAN-AKAT */ - {0x0E34u, 0xF701u, 0xF885u}, /* SARA I */ - {0x0E35u, 0xF702u, 0xF886u}, /* SARA II */ - {0x0E36u, 0xF703u, 0xF887u}, /* SARA UE */ - {0x0E37u, 0xF704u, 0xF888u}, /* SARA UEE */ - {0x0E47u, 0xF712u, 0xF889u}, /* MAITAIKHU */ - {0x0E4Du, 0xF711u, 0xF899u}, /* NIKHAHIT */ - {0x0000u, 0x0000u, 0x0000u} - }; - static const thai_pua_mapping_t RD_mappings[] = { - {0x0E0Du, 0xF70Fu, 0xF89Au}, /* YO YING */ - {0x0E10u, 0xF700u, 0xF89Eu}, /* THO THAN */ - {0x0000u, 0x0000u, 0x0000u} - }; - - switch (action) { - case NOP: return u; - case SD: pua_mappings = SD_mappings; break; - case SDL: pua_mappings = SDL_mappings; break; - case SL: pua_mappings = SL_mappings; break; - case RD: pua_mappings = RD_mappings; break; - } - for (; pua_mappings->u; pua_mappings++) - if (pua_mappings->u == u) - { - hb_codepoint_t glyph; - if (hb_font_get_glyph (font, pua_mappings->win_pua, 0, &glyph)) - return pua_mappings->win_pua; - if (hb_font_get_glyph (font, pua_mappings->mac_pua, 0, &glyph)) - return pua_mappings->mac_pua; - break; - } - return u; -} - - -static enum thai_above_state_t -{ /* Cluster above looks like: */ - T0, /* ⣤ */ - T1, /* ⣼ */ - T2, /* ⣾ */ - T3, /* ⣿ */ - NUM_ABOVE_STATES -} thai_above_start_state[NUM_CONSONANT_TYPES + 1/* For NOT_CONSONANT */] = -{ - T0, /* NC */ - T1, /* AC */ - T0, /* RC */ - T0, /* DC */ - T3, /* NOT_CONSONANT */ -}; - -static const struct thai_above_state_machine_edge_t { - thai_action_t action; - thai_above_state_t next_state; -} thai_above_state_machine[NUM_ABOVE_STATES][NUM_MARK_TYPES] = -{ /*AV*/ /*BV*/ /*T*/ -/*T0*/ {{NOP,T3}, {NOP,T0}, {SD, T3}}, -/*T1*/ {{SL, T2}, {NOP,T1}, {SDL,T2}}, -/*T2*/ {{NOP,T3}, {NOP,T2}, {SL, T3}}, -/*T3*/ {{NOP,T3}, {NOP,T3}, {NOP,T3}}, -}; - - -static enum thai_below_state_t -{ - B0, /* No descender */ - B1, /* Removable descender */ - B2, /* Strict descender */ - NUM_BELOW_STATES -} thai_below_start_state[NUM_CONSONANT_TYPES + 1/* For NOT_CONSONANT */] = -{ - B0, /* NC */ - B0, /* AC */ - B1, /* RC */ - B2, /* DC */ - B2, /* NOT_CONSONANT */ -}; - -static const struct thai_below_state_machine_edge_t { - thai_action_t action; - thai_below_state_t next_state; -} thai_below_state_machine[NUM_BELOW_STATES][NUM_MARK_TYPES] = -{ /*AV*/ /*BV*/ /*T*/ -/*B0*/ {{NOP,B0}, {NOP,B2}, {NOP, B0}}, -/*B1*/ {{NOP,B1}, {RD, B2}, {NOP, B1}}, -/*B2*/ {{NOP,B2}, {SD, B2}, {NOP, B2}}, -}; - - -static void -do_thai_pua_shaping (const hb_ot_shape_plan_t *plan HB_UNUSED, - hb_buffer_t *buffer, - hb_font_t *font) -{ -#ifdef HB_NO_OT_SHAPE_COMPLEX_THAI_FALLBACK - return; -#endif - - thai_above_state_t above_state = thai_above_start_state[NOT_CONSONANT]; - thai_below_state_t below_state = thai_below_start_state[NOT_CONSONANT]; - unsigned int base = 0; - - hb_glyph_info_t *info = buffer->info; - unsigned int count = buffer->len; - for (unsigned int i = 0; i < count; i++) - { - thai_mark_type_t mt = get_mark_type (info[i].codepoint); - - if (mt == NOT_MARK) { - thai_consonant_type_t ct = get_consonant_type (info[i].codepoint); - above_state = thai_above_start_state[ct]; - below_state = thai_below_start_state[ct]; - base = i; - continue; - } - - const thai_above_state_machine_edge_t &above_edge = thai_above_state_machine[above_state][mt]; - const thai_below_state_machine_edge_t &below_edge = thai_below_state_machine[below_state][mt]; - above_state = above_edge.next_state; - below_state = below_edge.next_state; - - /* At least one of the above/below actions is NOP. */ - thai_action_t action = above_edge.action != NOP ? above_edge.action : below_edge.action; - - buffer->unsafe_to_break (base, i); - if (action == RD) - info[base].codepoint = thai_pua_shape (info[base].codepoint, action, font); - else - info[i].codepoint = thai_pua_shape (info[i].codepoint, action, font); - } -} - - -static void -preprocess_text_thai (const hb_ot_shape_plan_t *plan, - hb_buffer_t *buffer, - hb_font_t *font) -{ - /* This function implements the shaping logic documented here: - * - * https://linux.thai.net/~thep/th-otf/shaping.html - * - * The first shaping rule listed there is needed even if the font has Thai - * OpenType tables. The rest do fallback positioning based on PUA codepoints. - * We implement that only if there exist no Thai GSUB in the font. - */ - - /* The following is NOT specified in the MS OT Thai spec, however, it seems - * to be what Uniscribe and other engines implement. According to Eric Muller: - * - * When you have a SARA AM, decompose it in NIKHAHIT + SARA AA, *and* move the - * NIKHAHIT backwards over any tone mark (0E48-0E4B). - * - * <0E14, 0E4B, 0E33> -> <0E14, 0E4D, 0E4B, 0E32> - * - * This reordering is legit only when the NIKHAHIT comes from a SARA AM, not - * when it's there to start with. The string <0E14, 0E4B, 0E4D> is probably - * not what a user wanted, but the rendering is nevertheless nikhahit above - * chattawa. - * - * Same for Lao. - * - * Note: - * - * Uniscribe also does some below-marks reordering. Namely, it positions U+0E3A - * after U+0E38 and U+0E39. We do that by modifying the ccc for U+0E3A. - * See unicode->modified_combining_class (). Lao does NOT have a U+0E3A - * equivalent. - */ - - - /* - * Here are the characters of significance: - * - * Thai Lao - * SARA AM: U+0E33 U+0EB3 - * SARA AA: U+0E32 U+0EB2 - * Nikhahit: U+0E4D U+0ECD - * - * Testing shows that Uniscribe reorder the following marks: - * Thai: <0E31,0E34..0E37,0E47..0E4E> - * Lao: <0EB1,0EB4..0EB7,0EC7..0ECE> - * - * Note how the Lao versions are the same as Thai + 0x80. - */ - - /* We only get one script at a time, so a script-agnostic implementation - * is adequate here. */ -#define IS_SARA_AM(x) (((x) & ~0x0080u) == 0x0E33u) -#define NIKHAHIT_FROM_SARA_AM(x) ((x) - 0x0E33u + 0x0E4Du) -#define SARA_AA_FROM_SARA_AM(x) ((x) - 1) -#define IS_TONE_MARK(x) (hb_in_ranges<hb_codepoint_t> ((x) & ~0x0080u, 0x0E34u, 0x0E37u, 0x0E47u, 0x0E4Eu, 0x0E31u, 0x0E31u)) - - buffer->clear_output (); - unsigned int count = buffer->len; - for (buffer->idx = 0; buffer->idx < count && buffer->successful;) - { - hb_codepoint_t u = buffer->cur().codepoint; - if (likely (!IS_SARA_AM (u))) { - buffer->next_glyph (); - continue; - } - - /* Is SARA AM. Decompose and reorder. */ - hb_glyph_info_t &nikhahit = buffer->output_glyph (NIKHAHIT_FROM_SARA_AM (u)); - _hb_glyph_info_set_continuation (&nikhahit); - buffer->replace_glyph (SARA_AA_FROM_SARA_AM (u)); - if (unlikely (!buffer->successful)) - return; - - /* Make Nikhahit be recognized as a ccc=0 mark when zeroing widths. */ - unsigned int end = buffer->out_len; - _hb_glyph_info_set_general_category (&buffer->out_info[end - 2], HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK); - - /* Ok, let's see... */ - unsigned int start = end - 2; - while (start > 0 && IS_TONE_MARK (buffer->out_info[start - 1].codepoint)) - start--; - - if (start + 2 < end) - { - /* Move Nikhahit (end-2) to the beginning */ - buffer->merge_out_clusters (start, end); - hb_glyph_info_t t = buffer->out_info[end - 2]; - memmove (buffer->out_info + start + 1, - buffer->out_info + start, - sizeof (buffer->out_info[0]) * (end - start - 2)); - buffer->out_info[start] = t; - } - else - { - /* Since we decomposed, and NIKHAHIT is combining, merge clusters with the - * previous cluster. */ - if (start && buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES) - buffer->merge_out_clusters (start - 1, end); - } - } - buffer->swap_buffers (); - - /* If font has Thai GSUB, we are done. */ - if (plan->props.script == HB_SCRIPT_THAI && !plan->map.found_script[0]) - do_thai_pua_shaping (plan, buffer, font); -} - -const hb_ot_complex_shaper_t _hb_ot_complex_shaper_thai = -{ - nullptr, /* collect_features */ - nullptr, /* override_features */ - nullptr, /* data_create */ - nullptr, /* data_destroy */ - preprocess_text_thai, - nullptr, /* postprocess_glyphs */ - HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT, - nullptr, /* decompose */ - nullptr, /* compose */ - nullptr, /* setup_masks */ - HB_TAG_NONE, /* gpos_tag */ - nullptr, /* reorder_marks */ - HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE, - false,/* fallback_position */ -}; - - -#endif |