gfx/harfbuzz/src/hb-ot-shaper-syllabic.cc

   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