Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/include/mupdf/fitz/bidi.h @ 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 /**
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2 Bidirectional text processing.
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4 Derived from the SmartOffice code, which is itself derived
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5 from the example unicode standard code. Original copyright
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6 messages follow:
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8 Copyright (C) Picsel, 2004-2008. All Rights Reserved.
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10 Processes Unicode text by arranging the characters into an order
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11 suitable for display. E.g. Hebrew text will be arranged from
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12 right-to-left and any English within the text will remain in the
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13 left-to-right order.
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15 This is an implementation of the Unicode Bidirectional Algorithm
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16 which can be found here: http://www.unicode.org/reports/tr9/ and
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17 is based on the reference implementation found on Unicode.org.
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18 */
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20 #ifndef FITZ_BIDI_H
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21 #define FITZ_BIDI_H
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23 #include "mupdf/fitz/system.h"
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24 #include "mupdf/fitz/context.h"
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26 /* Implementation details: subject to change. */
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28 typedef enum
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29 {
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30 FZ_BIDI_LTR = 0,
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31 FZ_BIDI_RTL = 1,
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32 FZ_BIDI_NEUTRAL = 2
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33 }
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34 fz_bidi_direction;
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36 typedef enum
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37 {
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38 FZ_BIDI_CLASSIFY_WHITE_SPACE = 1,
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39 FZ_BIDI_REPLACE_TAB = 2
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40 }
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41 fz_bidi_flags;
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43 /**
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44 Prototype for callback function supplied to fz_bidi_fragment_text.
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46 @param fragment first character in fragment
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47 @param fragmentLen number of characters in fragment
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48 @param bidiLevel The bidirectional level for this text.
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49 The bottom bit will be set iff block
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50 should concatenate with other blocks as
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51 right-to-left
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52 @param script the script in use for this fragment (other
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53 than common or inherited)
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54 @param arg data from caller of Bidi_fragmentText
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55 */
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56 typedef void (fz_bidi_fragment_fn)(const uint32_t *fragment,
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57 size_t fragmentLen,
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58 int bidiLevel,
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59 int script,
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60 void *arg);
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62 /**
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63 Partitions the given Unicode sequence into one or more
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64 unidirectional fragments and invokes the given callback
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65 function for each fragment.
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66
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67 For example, if directionality of text is:
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68 0123456789
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69 rrlllrrrrr,
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70 we'll invoke callback with:
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71 &text[0], length == 2
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72 &text[2], length == 3
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73 &text[5], length == 5
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74
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75 @param[in] text start of Unicode sequence
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76 @param[in] textlen number of Unicodes to analyse
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77 @param[in] baseDir direction of paragraph (specify FZ_BIDI_NEUTRAL to force auto-detection)
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78 @param[in] callback function to be called for each fragment
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79 @param[in] arg data to be passed to the callback function
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80 @param[in] flags flags to control operation (see fz_bidi_flags above)
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81 */
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82 void fz_bidi_fragment_text(fz_context *ctx,
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83 const uint32_t *text,
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84 size_t textlen,
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85 fz_bidi_direction *baseDir,
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86 fz_bidi_fragment_fn *callback,
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87 void *arg,
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88 int flags);
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89
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90 #endif