hb-ot-shaper-syllabic.cc (3533B)
1 /* 2 * Copyright © 2021 Behdad Esfahbod. 3 * 4 * This is part of HarfBuzz, a text shaping library. 5 * 6 * Permission is hereby granted, without written agreement and without 7 * license or royalty fees, to use, copy, modify, and distribute this 8 * software and its documentation for any purpose, provided that the 9 * above copyright notice and the following two paragraphs appear in 10 * all copies of this software. 11 * 12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 16 * DAMAGE. 17 * 18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 23 */ 24 25 #include "hb.hh" 26 27 #ifndef HB_NO_OT_SHAPE 28 29 #include "hb-ot-shaper-syllabic.hh" 30 31 32 bool 33 hb_syllabic_insert_dotted_circles (hb_font_t *font, 34 hb_buffer_t *buffer, 35 unsigned int broken_syllable_type, 36 unsigned int dottedcircle_category, 37 int repha_category, 38 int dottedcircle_position) 39 { 40 if (unlikely (buffer->flags & HB_BUFFER_FLAG_DO_NOT_INSERT_DOTTED_CIRCLE)) 41 return false; 42 if (likely (!(buffer->scratch_flags & HB_BUFFER_SCRATCH_FLAG_HAS_BROKEN_SYLLABLE))) 43 { 44 if (buffer->messaging ()) 45 (void) buffer->message (font, "skipped inserting dotted-circles because there is no broken syllables"); 46 return false; 47 } 48 49 if (buffer->messaging () && 50 !buffer->message (font, "start inserting dotted-circles")) 51 return false; 52 53 hb_codepoint_t dottedcircle_glyph; 54 if (!font->get_nominal_glyph (0x25CCu, &dottedcircle_glyph)) 55 return false; 56 57 hb_glyph_info_t dottedcircle = {0}; 58 dottedcircle.codepoint = 0x25CCu; 59 dottedcircle.ot_shaper_var_u8_category() = dottedcircle_category; 60 if (dottedcircle_position != -1) 61 dottedcircle.ot_shaper_var_u8_auxiliary() = dottedcircle_position; 62 dottedcircle.codepoint = dottedcircle_glyph; 63 64 buffer->clear_output (); 65 66 buffer->idx = 0; 67 unsigned int last_syllable = 0; 68 while (buffer->idx < buffer->len && buffer->successful) 69 { 70 unsigned int syllable = buffer->cur().syllable(); 71 if (unlikely (last_syllable != syllable && (syllable & 0x0F) == broken_syllable_type)) 72 { 73 last_syllable = syllable; 74 75 hb_glyph_info_t ginfo = dottedcircle; 76 ginfo.cluster = buffer->cur().cluster; 77 ginfo.mask = buffer->cur().mask; 78 ginfo.syllable() = buffer->cur().syllable(); 79 80 /* Insert dottedcircle after possible Repha. */ 81 if (repha_category != -1) 82 { 83 while (buffer->idx < buffer->len && buffer->successful && 84 last_syllable == buffer->cur().syllable() && 85 buffer->cur().ot_shaper_var_u8_category() == (unsigned) repha_category) 86 (void) buffer->next_glyph (); 87 } 88 89 (void) buffer->output_info (ginfo); 90 } 91 else 92 (void) buffer->next_glyph (); 93 } 94 buffer->sync (); 95 96 if (buffer->messaging ()) 97 (void) buffer->message (font, "end inserting dotted-circles"); 98 99 return true; 100 } 101 102 HB_INTERNAL bool 103 hb_syllabic_clear_var (const hb_ot_shape_plan_t *plan, 104 hb_font_t *font, 105 hb_buffer_t *buffer) 106 { 107 HB_BUFFER_DEALLOCATE_VAR (buffer, syllable); 108 return false; 109 } 110 111 112 #endif