Mercurial > hgrepos > Python2 > PyMuPDF
annotate mupdf-source/thirdparty/harfbuzz/src/hb-ot-shaper-thai.cc @ 46:7ee69f120f19 default tip
>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
| author | Franz Glasner <fzglas.hg@dom66.de> |
|---|---|
| date | Sat, 11 Oct 2025 17:17:30 +0200 |
| parents | b50eed0cc0ef |
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| rev | line source |
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2
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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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1 /* |
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2 * Copyright © 2010,2012 Google, Inc. |
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3 * |
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4 * This is part of HarfBuzz, a text shaping library. |
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5 * |
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6 * Permission is hereby granted, without written agreement and without |
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7 * license or royalty fees, to use, copy, modify, and distribute this |
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8 * software and its documentation for any purpose, provided that the |
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9 * above copyright notice and the following two paragraphs appear in |
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10 * all copies of this software. |
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11 * |
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12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
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13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
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14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
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15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
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16 * DAMAGE. |
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17 * |
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18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
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19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
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21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
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22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
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23 * |
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24 * Google Author(s): Behdad Esfahbod |
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25 */ |
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26 |
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27 #include "hb.hh" |
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28 |
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29 #ifndef HB_NO_OT_SHAPE |
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30 |
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31 #include "hb-ot-shaper.hh" |
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32 |
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33 |
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34 /* Thai / Lao shaper */ |
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35 |
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36 |
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37 /* PUA shaping */ |
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38 |
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parents:
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39 |
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parents:
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40 enum thai_consonant_type_t |
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41 { |
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42 NC, |
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43 AC, |
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44 RC, |
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45 DC, |
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46 NOT_CONSONANT, |
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47 NUM_CONSONANT_TYPES = NOT_CONSONANT |
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48 }; |
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49 |
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50 static thai_consonant_type_t |
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51 get_consonant_type (hb_codepoint_t u) |
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52 { |
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53 if (u == 0x0E1Bu || u == 0x0E1Du || u == 0x0E1Fu/* || u == 0x0E2Cu*/) |
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54 return AC; |
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55 if (u == 0x0E0Du || u == 0x0E10u) |
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56 return RC; |
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57 if (u == 0x0E0Eu || u == 0x0E0Fu) |
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58 return DC; |
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59 if (hb_in_range<hb_codepoint_t> (u, 0x0E01u, 0x0E2Eu)) |
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60 return NC; |
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61 return NOT_CONSONANT; |
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62 } |
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63 |
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64 |
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65 enum thai_mark_type_t |
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66 { |
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67 AV, |
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68 BV, |
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69 T, |
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70 NOT_MARK, |
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71 NUM_MARK_TYPES = NOT_MARK |
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72 }; |
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73 |
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74 static thai_mark_type_t |
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75 get_mark_type (hb_codepoint_t u) |
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76 { |
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77 if (u == 0x0E31u || hb_in_range<hb_codepoint_t> (u, 0x0E34u, 0x0E37u) || |
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78 u == 0x0E47u || hb_in_range<hb_codepoint_t> (u, 0x0E4Du, 0x0E4Eu)) |
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79 return AV; |
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80 if (hb_in_range<hb_codepoint_t> (u, 0x0E38u, 0x0E3Au)) |
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parents:
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81 return BV; |
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82 if (hb_in_range<hb_codepoint_t> (u, 0x0E48u, 0x0E4Cu)) |
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parents:
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83 return T; |
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parents:
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84 return NOT_MARK; |
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85 } |
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parents:
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86 |
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parents:
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87 |
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parents:
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|
88 enum thai_action_t |
|
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff
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|
89 { |
|
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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
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|
90 NOP, |
|
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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
|
91 SD, /* Shift combining-mark down */ |
|
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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
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|
92 SL, /* Shift combining-mark left */ |
|
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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
|
93 SDL, /* Shift combining-mark down-left */ |
|
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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
|
94 RD /* Remove descender from base */ |
|
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff
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|
95 }; |
|
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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
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|
96 |
|
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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
|
97 static hb_codepoint_t |
|
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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
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|
98 thai_pua_shape (hb_codepoint_t u, thai_action_t action, hb_font_t *font) |
|
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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
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|
99 { |
|
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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
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|
100 struct thai_pua_mapping_t { |
|
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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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|
101 uint16_t u; |
|
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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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|
102 uint16_t win_pua; |
|
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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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|
103 uint16_t mac_pua; |
|
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parents:
diff
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|
104 } const *pua_mappings = nullptr; |
|
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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
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|
105 static const thai_pua_mapping_t SD_mappings[] = { |
|
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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
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|
106 {0x0E48u, 0xF70Au, 0xF88Bu}, /* MAI EK */ |
|
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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
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|
107 {0x0E49u, 0xF70Bu, 0xF88Eu}, /* MAI THO */ |
|
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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
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|
108 {0x0E4Au, 0xF70Cu, 0xF891u}, /* MAI TRI */ |
|
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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
|
109 {0x0E4Bu, 0xF70Du, 0xF894u}, /* MAI CHATTAWA */ |
|
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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 {0x0E4Cu, 0xF70Eu, 0xF897u}, /* THANTHAKHAT */ |
|
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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 {0x0E38u, 0xF718u, 0xF89Bu}, /* SARA U */ |
|
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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 {0x0E39u, 0xF719u, 0xF89Cu}, /* SARA UU */ |
|
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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 {0x0E3Au, 0xF71Au, 0xF89Du}, /* PHINTHU */ |
|
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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
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|
114 {0x0000u, 0x0000u, 0x0000u} |
|
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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
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|
115 }; |
|
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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
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|
116 static const thai_pua_mapping_t SDL_mappings[] = { |
|
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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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|
117 {0x0E48u, 0xF705u, 0xF88Cu}, /* MAI EK */ |
|
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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
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|
118 {0x0E49u, 0xF706u, 0xF88Fu}, /* MAI THO */ |
|
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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
|
119 {0x0E4Au, 0xF707u, 0xF892u}, /* MAI TRI */ |
|
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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
|
120 {0x0E4Bu, 0xF708u, 0xF895u}, /* MAI CHATTAWA */ |
|
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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
|
121 {0x0E4Cu, 0xF709u, 0xF898u}, /* THANTHAKHAT */ |
|
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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
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|
122 {0x0000u, 0x0000u, 0x0000u} |
|
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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
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|
123 }; |
|
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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
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|
124 static const thai_pua_mapping_t SL_mappings[] = { |
|
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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
|
125 {0x0E48u, 0xF713u, 0xF88Au}, /* MAI EK */ |
|
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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
|
126 {0x0E49u, 0xF714u, 0xF88Du}, /* MAI THO */ |
|
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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
|
127 {0x0E4Au, 0xF715u, 0xF890u}, /* MAI TRI */ |
|
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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
|
128 {0x0E4Bu, 0xF716u, 0xF893u}, /* MAI CHATTAWA */ |
|
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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
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|
129 {0x0E4Cu, 0xF717u, 0xF896u}, /* THANTHAKHAT */ |
|
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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
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|
130 {0x0E31u, 0xF710u, 0xF884u}, /* MAI HAN-AKAT */ |
|
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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
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|
131 {0x0E34u, 0xF701u, 0xF885u}, /* SARA I */ |
|
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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
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|
132 {0x0E35u, 0xF702u, 0xF886u}, /* SARA II */ |
|
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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
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|
133 {0x0E36u, 0xF703u, 0xF887u}, /* SARA UE */ |
|
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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
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|
134 {0x0E37u, 0xF704u, 0xF888u}, /* SARA UEE */ |
|
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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
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|
135 {0x0E47u, 0xF712u, 0xF889u}, /* MAITAIKHU */ |
|
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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 {0x0E4Du, 0xF711u, 0xF899u}, /* NIKHAHIT */ |
|
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
|
137 {0x0000u, 0x0000u, 0x0000u} |
|
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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
|
138 }; |
|
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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
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|
139 static const thai_pua_mapping_t RD_mappings[] = { |
|
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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
|
140 {0x0E0Du, 0xF70Fu, 0xF89Au}, /* YO YING */ |
|
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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
|
141 {0x0E10u, 0xF700u, 0xF89Eu}, /* THO THAN */ |
|
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
|
142 {0x0000u, 0x0000u, 0x0000u} |
|
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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
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|
143 }; |
|
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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
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|
144 |
|
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff
changeset
|
145 switch (action) { |
|
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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
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|
146 case NOP: return u; |
|
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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 case SD: pua_mappings = SD_mappings; break; |
|
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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
|
148 case SDL: pua_mappings = SDL_mappings; break; |
|
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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
|
149 case SL: pua_mappings = SL_mappings; break; |
|
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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
|
150 case RD: pua_mappings = RD_mappings; break; |
|
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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
|
151 } |
|
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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
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|
152 for (; pua_mappings->u; pua_mappings++) |
|
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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
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|
153 if (pua_mappings->u == u) |
|
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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
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|
154 { |
|
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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
|
155 hb_codepoint_t glyph; |
|
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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
|
156 if (hb_font_get_glyph (font, pua_mappings->win_pua, 0, &glyph)) |
|
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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
|
157 return pua_mappings->win_pua; |
|
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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 if (hb_font_get_glyph (font, pua_mappings->mac_pua, 0, &glyph)) |
|
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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 pua_mappings->mac_pua; |
|
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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 break; |
|
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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
|
161 } |
|
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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
|
162 return u; |
|
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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
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|
163 } |
|
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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
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|
164 |
|
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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
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|
165 |
|
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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 static enum thai_above_state_t |
|
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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 { /* Cluster above looks like: */ |
|
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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 T0, /* ⣤ */ |
|
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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
|
169 T1, /* ⣼ */ |
|
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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
|
170 T2, /* ⣾ */ |
|
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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 T3, /* ⣿ */ |
|
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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
|
172 NUM_ABOVE_STATES |
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173 } thai_above_start_state[NUM_CONSONANT_TYPES + 1/* For NOT_CONSONANT */] = |
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174 { |
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175 T0, /* NC */ |
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176 T1, /* AC */ |
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177 T0, /* RC */ |
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178 T0, /* DC */ |
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179 T3, /* NOT_CONSONANT */ |
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180 }; |
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181 |
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182 static const struct thai_above_state_machine_edge_t { |
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183 thai_action_t action; |
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184 thai_above_state_t next_state; |
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185 } thai_above_state_machine[NUM_ABOVE_STATES][NUM_MARK_TYPES] = |
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186 { /*AV*/ /*BV*/ /*T*/ |
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187 /*T0*/ {{NOP,T3}, {NOP,T0}, {SD, T3}}, |
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188 /*T1*/ {{SL, T2}, {NOP,T1}, {SDL,T2}}, |
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189 /*T2*/ {{NOP,T3}, {NOP,T2}, {SL, T3}}, |
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190 /*T3*/ {{NOP,T3}, {NOP,T3}, {NOP,T3}}, |
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191 }; |
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192 |
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193 |
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194 static enum thai_below_state_t |
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195 { |
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196 B0, /* No descender */ |
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197 B1, /* Removable descender */ |
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198 B2, /* Strict descender */ |
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199 NUM_BELOW_STATES |
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200 } thai_below_start_state[NUM_CONSONANT_TYPES + 1/* For NOT_CONSONANT */] = |
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201 { |
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202 B0, /* NC */ |
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203 B0, /* AC */ |
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204 B1, /* RC */ |
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205 B2, /* DC */ |
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206 B2, /* NOT_CONSONANT */ |
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207 }; |
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208 |
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209 static const struct thai_below_state_machine_edge_t { |
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210 thai_action_t action; |
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211 thai_below_state_t next_state; |
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212 } thai_below_state_machine[NUM_BELOW_STATES][NUM_MARK_TYPES] = |
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213 { /*AV*/ /*BV*/ /*T*/ |
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214 /*B0*/ {{NOP,B0}, {NOP,B2}, {NOP, B0}}, |
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215 /*B1*/ {{NOP,B1}, {RD, B2}, {NOP, B1}}, |
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216 /*B2*/ {{NOP,B2}, {SD, B2}, {NOP, B2}}, |
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217 }; |
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218 |
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219 |
|
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220 static void |
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221 do_thai_pua_shaping (const hb_ot_shape_plan_t *plan HB_UNUSED, |
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222 hb_buffer_t *buffer, |
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223 hb_font_t *font) |
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224 { |
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225 #ifdef HB_NO_OT_SHAPER_THAI_FALLBACK |
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226 return; |
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227 #endif |
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228 |
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229 thai_above_state_t above_state = thai_above_start_state[NOT_CONSONANT]; |
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230 thai_below_state_t below_state = thai_below_start_state[NOT_CONSONANT]; |
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231 unsigned int base = 0; |
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232 |
|
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233 hb_glyph_info_t *info = buffer->info; |
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234 unsigned int count = buffer->len; |
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235 for (unsigned int i = 0; i < count; i++) |
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236 { |
|
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237 thai_mark_type_t mt = get_mark_type (info[i].codepoint); |
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238 |
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239 if (mt == NOT_MARK) { |
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240 thai_consonant_type_t ct = get_consonant_type (info[i].codepoint); |
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241 above_state = thai_above_start_state[ct]; |
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242 below_state = thai_below_start_state[ct]; |
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243 base = i; |
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244 continue; |
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245 } |
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246 |
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247 const thai_above_state_machine_edge_t &above_edge = thai_above_state_machine[above_state][mt]; |
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248 const thai_below_state_machine_edge_t &below_edge = thai_below_state_machine[below_state][mt]; |
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249 above_state = above_edge.next_state; |
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250 below_state = below_edge.next_state; |
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251 |
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252 /* At least one of the above/below actions is NOP. */ |
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253 thai_action_t action = above_edge.action != NOP ? above_edge.action : below_edge.action; |
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254 |
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255 buffer->unsafe_to_break (base, i); |
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256 if (action == RD) |
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257 info[base].codepoint = thai_pua_shape (info[base].codepoint, action, font); |
|
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258 else |
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parents:
diff
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259 info[i].codepoint = thai_pua_shape (info[i].codepoint, action, font); |
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260 } |
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261 } |
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262 |
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263 |
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264 static void |
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265 preprocess_text_thai (const hb_ot_shape_plan_t *plan, |
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266 hb_buffer_t *buffer, |
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267 hb_font_t *font) |
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268 { |
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269 /* This function implements the shaping logic documented here: |
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270 * |
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271 * https://linux.thai.net/~thep/th-otf/shaping.html |
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272 * |
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273 * The first shaping rule listed there is needed even if the font has Thai |
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274 * OpenType tables. The rest do fallback positioning based on PUA codepoints. |
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275 * We implement that only if there exist no Thai GSUB in the font. |
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276 */ |
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277 |
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278 /* The following is NOT specified in the MS OT Thai spec, however, it seems |
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279 * to be what Uniscribe and other engines implement. According to Eric Muller: |
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280 * |
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281 * When you have a SARA AM, decompose it in NIKHAHIT + SARA AA, *and* move the |
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282 * NIKHAHIT backwards over any above-base marks. |
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283 * |
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284 * <0E14, 0E4B, 0E33> -> <0E14, 0E4D, 0E4B, 0E32> |
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285 * |
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286 * This reordering is legit only when the NIKHAHIT comes from a SARA AM, not |
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287 * when it's there to start with. The string <0E14, 0E4B, 0E4D> is probably |
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288 * not what a user wanted, but the rendering is nevertheless nikhahit above |
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289 * chattawa. |
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290 * |
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291 * Same for Lao. |
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292 * |
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293 * Note: |
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294 * |
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295 * Uniscribe also does some below-marks reordering. Namely, it positions U+0E3A |
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296 * after U+0E38 and U+0E39. We do that by modifying the ccc for U+0E3A. |
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297 * See unicode->modified_combining_class (). Lao does NOT have a U+0E3A |
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298 * equivalent. |
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299 */ |
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300 |
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301 |
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302 /* |
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303 * Here are the characters of significance: |
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304 * |
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305 * Thai Lao |
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306 * SARA AM: U+0E33 U+0EB3 |
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307 * SARA AA: U+0E32 U+0EB2 |
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308 * Nikhahit: U+0E4D U+0ECD |
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309 * |
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310 * Testing shows that Uniscribe reorder the following marks: |
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311 * Thai: <0E31,0E34..0E37, 0E47..0E4E> |
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312 * Lao: <0EB1,0EB4..0EB7,0EBB,0EC8..0ECD> |
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313 * |
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314 * Note how the Lao versions are the same as Thai + 0x80. |
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315 */ |
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316 |
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317 /* We only get one script at a time, so a script-agnostic implementation |
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318 * is adequate here. */ |
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319 #define IS_SARA_AM(x) (((x) & ~0x0080u) == 0x0E33u) |
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320 #define NIKHAHIT_FROM_SARA_AM(x) ((x) - 0x0E33u + 0x0E4Du) |
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321 #define SARA_AA_FROM_SARA_AM(x) ((x) - 1) |
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322 #define IS_ABOVE_BASE_MARK(x) (hb_in_ranges<hb_codepoint_t> ((x) & ~0x0080u, 0x0E34u, 0x0E37u, 0x0E47u, 0x0E4Eu, 0x0E31u, 0x0E31u, 0x0E3Bu, 0x0E3Bu)) |
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323 |
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324 buffer->clear_output (); |
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325 unsigned int count = buffer->len; |
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326 for (buffer->idx = 0; buffer->idx < count /* No need for: && buffer->successful */;) |
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327 { |
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328 hb_codepoint_t u = buffer->cur().codepoint; |
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329 if (likely (!IS_SARA_AM (u))) |
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330 { |
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331 if (unlikely (!buffer->next_glyph ())) break; |
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332 continue; |
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333 } |
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334 |
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335 /* Is SARA AM. Decompose and reorder. */ |
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336 (void) buffer->output_glyph (NIKHAHIT_FROM_SARA_AM (u)); |
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337 _hb_glyph_info_set_continuation (&buffer->prev()); |
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338 if (unlikely (!buffer->replace_glyph (SARA_AA_FROM_SARA_AM (u)))) break; |
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339 |
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340 /* Make Nikhahit be recognized as a ccc=0 mark when zeroing widths. */ |
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341 unsigned int end = buffer->out_len; |
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342 _hb_glyph_info_set_general_category (&buffer->out_info[end - 2], HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK); |
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343 |
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344 /* Ok, let's see... */ |
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345 unsigned int start = end - 2; |
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346 while (start > 0 && IS_ABOVE_BASE_MARK (buffer->out_info[start - 1].codepoint)) |
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347 start--; |
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348 |
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349 if (start + 2 < end) |
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350 { |
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351 /* Move Nikhahit (end-2) to the beginning */ |
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352 buffer->merge_out_clusters (start, end); |
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353 hb_glyph_info_t t = buffer->out_info[end - 2]; |
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354 memmove (buffer->out_info + start + 1, |
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355 buffer->out_info + start, |
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356 sizeof (buffer->out_info[0]) * (end - start - 2)); |
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357 buffer->out_info[start] = t; |
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358 } |
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359 else |
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360 { |
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361 /* Since we decomposed, and NIKHAHIT is combining, merge clusters with the |
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362 * previous cluster. */ |
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363 if (start && buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES) |
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364 buffer->merge_out_clusters (start - 1, end); |
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365 } |
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366 } |
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367 buffer->sync (); |
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368 |
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369 /* If font has Thai GSUB, we are done. */ |
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370 if (plan->props.script == HB_SCRIPT_THAI && !plan->map.found_script[0]) |
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371 do_thai_pua_shaping (plan, buffer, font); |
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372 } |
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373 |
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374 const hb_ot_shaper_t _hb_ot_shaper_thai = |
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375 { |
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376 nullptr, /* collect_features */ |
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377 nullptr, /* override_features */ |
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378 nullptr, /* data_create */ |
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379 nullptr, /* data_destroy */ |
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380 preprocess_text_thai, |
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381 nullptr, /* postprocess_glyphs */ |
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382 nullptr, /* decompose */ |
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383 nullptr, /* compose */ |
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384 nullptr, /* setup_masks */ |
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385 nullptr, /* reorder_marks */ |
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386 HB_TAG_NONE, /* gpos_tag */ |
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387 HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT, |
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388 HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE, |
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389 false,/* fallback_position */ |
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390 }; |
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391 |
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392 |
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393 #endif |
