104 lines
3.2 KiB
C++
104 lines
3.2 KiB
C++
/*
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* Copyright © 2021 Behdad Esfahbod.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*/
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#include "hb.hh"
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#ifndef HB_NO_OT_SHAPE
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#include "hb-ot-shape-complex-syllabic.hh"
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void
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hb_syllabic_insert_dotted_circles (hb_font_t *font,
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hb_buffer_t *buffer,
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unsigned int broken_syllable_type,
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unsigned int dottedcircle_category,
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int repha_category,
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int dottedcircle_position)
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{
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if (unlikely (buffer->flags & HB_BUFFER_FLAG_DO_NOT_INSERT_DOTTED_CIRCLE))
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return;
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/* Note: This loop is extra overhead, but should not be measurable.
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* TODO Use a buffer scratch flag to remove the loop. */
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bool has_broken_syllables = false;
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unsigned int count = buffer->len;
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hb_glyph_info_t *info = buffer->info;
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for (unsigned int i = 0; i < count; i++)
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if ((info[i].syllable() & 0x0F) == broken_syllable_type)
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{
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has_broken_syllables = true;
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break;
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}
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if (likely (!has_broken_syllables))
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return;
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hb_codepoint_t dottedcircle_glyph;
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if (!font->get_nominal_glyph (0x25CCu, &dottedcircle_glyph))
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return;
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hb_glyph_info_t dottedcircle = {0};
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dottedcircle.codepoint = 0x25CCu;
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dottedcircle.complex_var_u8_category() = dottedcircle_category;
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if (dottedcircle_position != -1)
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dottedcircle.complex_var_u8_auxiliary() = dottedcircle_position;
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dottedcircle.codepoint = dottedcircle_glyph;
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buffer->clear_output ();
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buffer->idx = 0;
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unsigned int last_syllable = 0;
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while (buffer->idx < buffer->len && buffer->successful)
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{
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unsigned int syllable = buffer->cur().syllable();
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if (unlikely (last_syllable != syllable && (syllable & 0x0F) == broken_syllable_type))
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{
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last_syllable = syllable;
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hb_glyph_info_t ginfo = dottedcircle;
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ginfo.cluster = buffer->cur().cluster;
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ginfo.mask = buffer->cur().mask;
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ginfo.syllable() = buffer->cur().syllable();
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/* Insert dottedcircle after possible Repha. */
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if (repha_category != -1)
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{
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while (buffer->idx < buffer->len && buffer->successful &&
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last_syllable == buffer->cur().syllable() &&
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buffer->cur().complex_var_u8_category() == (unsigned) repha_category)
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(void) buffer->next_glyph ();
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}
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(void) buffer->output_info (ginfo);
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}
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else
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(void) buffer->next_glyph ();
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}
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buffer->swap_buffers ();
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}
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#endif
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