Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/OT/Layout/GSUB/ReverseChainSingleSubstFormat1.hh @ 40:aa33339d6b8a upstream

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ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
parents b50eed0cc0ef
children
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1 #ifndef OT_LAYOUT_GSUB_REVERSECHAINSINGLESUBSTFORMAT1_HH
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2 #define OT_LAYOUT_GSUB_REVERSECHAINSINGLESUBSTFORMAT1_HH
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3
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4 #include "Common.hh"
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5
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6 namespace OT {
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7 namespace Layout {
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8 namespace GSUB_impl {
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9
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10 struct ReverseChainSingleSubstFormat1
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11 {
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12 protected:
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13 HBUINT16 format; /* Format identifier--format = 1 */
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14 Offset16To<Coverage>
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15 coverage; /* Offset to Coverage table--from
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16 * beginning of table */
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17 Array16OfOffset16To<Coverage>
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18 backtrack; /* Array of coverage tables
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19 * in backtracking sequence, in glyph
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20 * sequence order */
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21 Array16OfOffset16To<Coverage>
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22 lookaheadX; /* Array of coverage tables
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23 * in lookahead sequence, in glyph
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24 * sequence order */
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25 Array16Of<HBGlyphID16>
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26 substituteX; /* Array of substitute
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27 * GlyphIDs--ordered by Coverage Index */
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28 public:
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29 DEFINE_SIZE_MIN (10);
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30
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31 bool sanitize (hb_sanitize_context_t *c) const
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32 {
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33 TRACE_SANITIZE (this);
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34 if (!(coverage.sanitize (c, this) && backtrack.sanitize (c, this)))
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35 return_trace (false);
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36 const auto &lookahead = StructAfter<decltype (lookaheadX)> (backtrack);
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37 if (!lookahead.sanitize (c, this))
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38 return_trace (false);
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39 const auto &substitute = StructAfter<decltype (substituteX)> (lookahead);
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40 return_trace (substitute.sanitize (c));
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41 }
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42
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43 bool intersects (const hb_set_t *glyphs) const
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44 {
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45 if (!(this+coverage).intersects (glyphs))
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46 return false;
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47
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48 const auto &lookahead = StructAfter<decltype (lookaheadX)> (backtrack);
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49
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50 unsigned int count;
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51
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52 count = backtrack.len;
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53 for (unsigned int i = 0; i < count; i++)
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54 if (!(this+backtrack[i]).intersects (glyphs))
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55 return false;
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57 count = lookahead.len;
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58 for (unsigned int i = 0; i < count; i++)
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59 if (!(this+lookahead[i]).intersects (glyphs))
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60 return false;
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61
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62 return true;
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63 }
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64
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65 bool may_have_non_1to1 () const
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66 { return false; }
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67
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68 void closure (hb_closure_context_t *c) const
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69 {
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70 if (!intersects (c->glyphs)) return;
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71
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72 const auto &lookahead = StructAfter<decltype (lookaheadX)> (backtrack);
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73 const auto &substitute = StructAfter<decltype (substituteX)> (lookahead);
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74
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75 + hb_zip (this+coverage, substitute)
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76 | hb_filter (c->parent_active_glyphs (), hb_first)
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77 | hb_map (hb_second)
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78 | hb_sink (c->output)
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79 ;
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80 }
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81
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82 void closure_lookups (hb_closure_lookups_context_t *c) const {}
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83
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84 void collect_glyphs (hb_collect_glyphs_context_t *c) const
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85 {
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86 if (unlikely (!(this+coverage).collect_coverage (c->input))) return;
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88 unsigned int count;
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90 count = backtrack.len;
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91 for (unsigned int i = 0; i < count; i++)
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92 if (unlikely (!(this+backtrack[i]).collect_coverage (c->before))) return;
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93
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94 const auto &lookahead = StructAfter<decltype (lookaheadX)> (backtrack);
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95 count = lookahead.len;
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96 for (unsigned int i = 0; i < count; i++)
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97 if (unlikely (!(this+lookahead[i]).collect_coverage (c->after))) return;
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99 const auto &substitute = StructAfter<decltype (substituteX)> (lookahead);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
100 count = substitute.len;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
101 c->output->add_array (substitute.arrayZ, substitute.len);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
102 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
103
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
104 const Coverage &get_coverage () const { return this+coverage; }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
105
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
106 bool would_apply (hb_would_apply_context_t *c) const
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
107 { return c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED; }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
108
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
109 bool apply (hb_ot_apply_context_t *c) const
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
110 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
111 TRACE_APPLY (this);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
112 if (unlikely (c->nesting_level_left != HB_MAX_NESTING_LEVEL))
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
113 return_trace (false); /* No chaining to this type */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
114
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
115 unsigned int index = (this+coverage).get_coverage (c->buffer->cur ().codepoint);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
116 if (likely (index == NOT_COVERED)) return_trace (false);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
117
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
118 const auto &lookahead = StructAfter<decltype (lookaheadX)> (backtrack);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
119 const auto &substitute = StructAfter<decltype (substituteX)> (lookahead);
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120
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
121 if (unlikely (index >= substitute.len)) return_trace (false);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
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122
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
123 unsigned int start_index = 0, end_index = 0;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
124 if (match_backtrack (c,
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Franz Glasner <fzglas.hg@dom66.de>
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diff changeset
125 backtrack.len, (HBUINT16 *) backtrack.arrayZ,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
126 match_coverage, this,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
127 &start_index) &&
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Franz Glasner <fzglas.hg@dom66.de>
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128 match_lookahead (c,
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Franz Glasner <fzglas.hg@dom66.de>
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129 lookahead.len, (HBUINT16 *) lookahead.arrayZ,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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130 match_coverage, this,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
131 c->buffer->idx + 1, &end_index))
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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132 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
133 c->buffer->unsafe_to_break_from_outbuffer (start_index, end_index);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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134
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
135 if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
136 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
137 c->buffer->message (c->font,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
138 "replacing glyph at %d (reverse chaining substitution)",
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
139 c->buffer->idx);
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Franz Glasner <fzglas.hg@dom66.de>
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140 }
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parents:
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141
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
142 c->replace_glyph_inplace (substitute[index]);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
143
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
144 if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
145 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
146 c->buffer->message (c->font,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
147 "replaced glyph at %d (reverse chaining substitution)",
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
148 c->buffer->idx);
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Franz Glasner <fzglas.hg@dom66.de>
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diff changeset
149 }
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diff changeset
150
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
151 /* Note: We DON'T decrease buffer->idx. The main loop does it
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
152 * for us. This is useful for preventing surprises if someone
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
153 * calls us through a Context lookup. */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
154 return_trace (true);
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parents:
diff changeset
155 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
156 else
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parents:
diff changeset
157 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
158 c->buffer->unsafe_to_concat_from_outbuffer (start_index, end_index);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
159 return_trace (false);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
160 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
161 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
162
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
163 template<typename Iterator,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
164 hb_requires (hb_is_iterator (Iterator))>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
165 bool serialize_coverage_offset_array (hb_subset_context_t *c, Iterator it) const
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
166 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
167 TRACE_SERIALIZE (this);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
168 auto *out = c->serializer->start_embed<Array16OfOffset16To<Coverage>> ();
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
169
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
170 if (unlikely (!c->serializer->allocate_size<HBUINT16> (HBUINT16::static_size)))
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
171 return_trace (false);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
172
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
173 for (auto& offset : it) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
174 auto *o = out->serialize_append (c->serializer);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
175 if (unlikely (!o) || !o->serialize_subset (c, offset, this))
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
176 return_trace (false);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
178
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
179 return_trace (true);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
180 }
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parents:
diff changeset
181
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
182 template<typename Iterator, typename BacktrackIterator, typename LookaheadIterator,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
183 hb_requires (hb_is_sorted_source_of (Iterator, hb_codepoint_pair_t)),
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184 hb_requires (hb_is_iterator (BacktrackIterator)),
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
185 hb_requires (hb_is_iterator (LookaheadIterator))>
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
186 bool serialize (hb_subset_context_t *c,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
187 Iterator coverage_subst_iter,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 BacktrackIterator backtrack_iter,
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
189 LookaheadIterator lookahead_iter) const
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
190 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
191 TRACE_SERIALIZE (this);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
192
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
193 auto *out = c->serializer->start_embed (this);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 if (unlikely (!c->serializer->check_success (out))) return_trace (false);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
195 if (unlikely (!c->serializer->embed (this->format))) return_trace (false);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
196 if (unlikely (!c->serializer->embed (this->coverage))) return_trace (false);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
197
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
198 if (!serialize_coverage_offset_array (c, backtrack_iter)) return_trace (false);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
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199 if (!serialize_coverage_offset_array (c, lookahead_iter)) return_trace (false);
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200
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201 auto *substitute_out = c->serializer->start_embed<Array16Of<HBGlyphID16>> ();
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202 auto substitutes =
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203 + coverage_subst_iter
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204 | hb_map (hb_second)
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205 ;
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206
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207 auto glyphs =
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208 + coverage_subst_iter
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209 | hb_map_retains_sorting (hb_first)
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210 ;
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211 if (unlikely (! c->serializer->check_success (substitute_out->serialize (c->serializer, substitutes))))
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212 return_trace (false);
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213
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214 if (unlikely (!out->coverage.serialize_serialize (c->serializer, glyphs)))
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215 return_trace (false);
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216 return_trace (true);
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217 }
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218
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219 bool subset (hb_subset_context_t *c) const
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220 {
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221 TRACE_SUBSET (this);
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222 const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
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223 const hb_map_t &glyph_map = *c->plan->glyph_map;
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224
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225 const auto &lookahead = StructAfter<decltype (lookaheadX)> (backtrack);
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226 const auto &substitute = StructAfter<decltype (substituteX)> (lookahead);
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227
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228 auto it =
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229 + hb_zip (this+coverage, substitute)
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230 | hb_filter (glyphset, hb_first)
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231 | hb_filter (glyphset, hb_second)
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232 | hb_map_retains_sorting ([&] (hb_pair_t<hb_codepoint_t, const HBGlyphID16 &> p) -> hb_codepoint_pair_t
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233 { return hb_pair (glyph_map[p.first], glyph_map[p.second]); })
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234 ;
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235
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236 return_trace (bool (it) && serialize (c, it, backtrack.iter (), lookahead.iter ()));
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237 }
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238 };
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239
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240 }
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241 }
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242 }
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243
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244 #endif /* HB_OT_LAYOUT_GSUB_REVERSECHAINSINGLESUBSTFORMAT1_HH */