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