Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/harfbuzz/src/OT/Layout/GSUB/AlternateSet.hh @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #ifndef OT_LAYOUT_GSUB_ALTERNATESET_HH
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2 #define OT_LAYOUT_GSUB_ALTERNATESET_HH
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4 #include "Common.hh"
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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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10 template <typename Types>
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11 struct AlternateSet
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12 {
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13 protected:
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14 Array16Of<typename Types::HBGlyphID>
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15 alternates; /* Array of alternate GlyphIDs--in
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16 * arbitrary order */
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17 public:
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18 DEFINE_SIZE_ARRAY (2, alternates);
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20 bool sanitize (hb_sanitize_context_t *c) const
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21 {
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22 TRACE_SANITIZE (this);
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23 return_trace (alternates.sanitize (c));
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24 }
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26 bool intersects (const hb_set_t *glyphs) const
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27 { return hb_any (alternates, glyphs); }
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29 void closure (hb_closure_context_t *c) const
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30 { c->output->add_array (alternates.arrayZ, alternates.len); }
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32 void collect_glyphs (hb_collect_glyphs_context_t *c) const
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33 { c->output->add_array (alternates.arrayZ, alternates.len); }
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35 bool apply (hb_ot_apply_context_t *c) const
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36 {
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37 TRACE_APPLY (this);
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38 unsigned int count = alternates.len;
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40 if (unlikely (!count)) return_trace (false);
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42 hb_mask_t glyph_mask = c->buffer->cur().mask;
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43 hb_mask_t lookup_mask = c->lookup_mask;
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45 /* Note: This breaks badly if two features enabled this lookup together. */
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46 unsigned int shift = hb_ctz (lookup_mask);
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47 unsigned int alt_index = ((lookup_mask & glyph_mask) >> shift);
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49 /* If alt_index is MAX_VALUE, randomize feature if it is the rand feature. */
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50 if (alt_index == HB_OT_MAP_MAX_VALUE && c->random)
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51 {
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52 /* Maybe we can do better than unsafe-to-break all; but since we are
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53 * changing random state, it would be hard to track that. Good 'nough. */
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54 c->buffer->unsafe_to_break (0, c->buffer->len);
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55 alt_index = c->random_number () % count + 1;
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56 }
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58 if (unlikely (alt_index > count || alt_index == 0)) return_trace (false);
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60 if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
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61 {
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62 c->buffer->sync_so_far ();
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63 c->buffer->message (c->font,
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64 "replacing glyph at %d (alternate substitution)",
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65 c->buffer->idx);
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66 }
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68 c->replace_glyph (alternates[alt_index - 1]);
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70 if (HB_BUFFER_MESSAGE_MORE && c->buffer->messaging ())
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71 {
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72 c->buffer->message (c->font,
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73 "replaced glyph at %d (alternate substitution)",
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74 c->buffer->idx - 1);
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75 }
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77 return_trace (true);
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78 }
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80 unsigned
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81 get_alternates (unsigned start_offset,
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82 unsigned *alternate_count /* IN/OUT. May be NULL. */,
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83 hb_codepoint_t *alternate_glyphs /* OUT. May be NULL. */) const
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84 {
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85 if (alternates.len && alternate_count)
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86 {
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87 + alternates.as_array ().sub_array (start_offset, alternate_count)
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88 | hb_sink (hb_array (alternate_glyphs, *alternate_count))
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89 ;
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90 }
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91 return alternates.len;
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92 }
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94 template <typename Iterator,
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95 hb_requires (hb_is_source_of (Iterator, hb_codepoint_t))>
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96 bool serialize (hb_serialize_context_t *c,
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97 Iterator alts)
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98 {
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99 TRACE_SERIALIZE (this);
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100 return_trace (alternates.serialize (c, alts));
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101 }
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102
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103 bool subset (hb_subset_context_t *c) const
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104 {
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105 TRACE_SUBSET (this);
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106 const hb_set_t &glyphset = *c->plan->glyphset_gsub ();
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107 const hb_map_t &glyph_map = *c->plan->glyph_map;
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108
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109 auto it =
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110 + hb_iter (alternates)
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111 | hb_filter (glyphset)
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112 | hb_map (glyph_map)
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113 ;
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114
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115 auto *out = c->serializer->start_embed (*this);
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116 return_trace (out->serialize (c->serializer, it) &&
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117 out->alternates);
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118 }
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119 };
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120
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121 }
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122 }
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123 }
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124
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125
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126 #endif /* OT_LAYOUT_GSUB_ALTERNATESET_HH */