91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
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/**
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Bidirectional text processing.
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Derived from the SmartOffice code, which is itself derived
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from the example unicode standard code. Original copyright
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messages follow:
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Copyright (C) Picsel, 2004-2008. All Rights Reserved.
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Processes Unicode text by arranging the characters into an order
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suitable for display. E.g. Hebrew text will be arranged from
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right-to-left and any English within the text will remain in the
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left-to-right order.
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This is an implementation of the Unicode Bidirectional Algorithm
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which can be found here: http://www.unicode.org/reports/tr9/ and
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is based on the reference implementation found on Unicode.org.
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*/
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#ifndef FITZ_BIDI_H
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#define FITZ_BIDI_H
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#include "mupdf/fitz/system.h"
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#include "mupdf/fitz/context.h"
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/* Implementation details: subject to change. */
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typedef enum
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{
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FZ_BIDI_LTR = 0,
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FZ_BIDI_RTL = 1,
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FZ_BIDI_NEUTRAL = 2
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}
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fz_bidi_direction;
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typedef enum
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{
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FZ_BIDI_CLASSIFY_WHITE_SPACE = 1,
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FZ_BIDI_REPLACE_TAB = 2
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}
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fz_bidi_flags;
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/**
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Prototype for callback function supplied to fz_bidi_fragment_text.
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@param fragment first character in fragment
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@param fragmentLen number of characters in fragment
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@param bidiLevel The bidirectional level for this text.
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The bottom bit will be set iff block
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should concatenate with other blocks as
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right-to-left
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@param script the script in use for this fragment (other
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than common or inherited)
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@param arg data from caller of Bidi_fragmentText
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*/
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typedef void (fz_bidi_fragment_fn)(const uint32_t *fragment,
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size_t fragmentLen,
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int bidiLevel,
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int script,
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void *arg);
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/**
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Partitions the given Unicode sequence into one or more
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unidirectional fragments and invokes the given callback
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function for each fragment.
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For example, if directionality of text is:
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0123456789
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rrlllrrrrr,
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we'll invoke callback with:
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&text[0], length == 2
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&text[2], length == 3
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&text[5], length == 5
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@param[in] text start of Unicode sequence
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@param[in] textlen number of Unicodes to analyse
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@param[in] baseDir direction of paragraph (specify FZ_BIDI_NEUTRAL to force auto-detection)
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@param[in] callback function to be called for each fragment
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@param[in] arg data to be passed to the callback function
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@param[in] flags flags to control operation (see fz_bidi_flags above)
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*/
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void fz_bidi_fragment_text(fz_context *ctx,
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const uint32_t *text,
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size_t textlen,
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fz_bidi_direction *baseDir,
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fz_bidi_fragment_fn *callback,
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void *arg,
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int flags);
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#endif
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