NAME
fribidi_reorder_line - reorder a line of logical string to visual
SYNOPSIS
#include <fribidi.h>
FriBidiLevel fribidi_reorder_line
(
FriBidiFlags flags,
const FriBidiCharType *bidi_types,
const FriBidiStrIndex len,
const FriBidiStrIndex off,
const FriBidiParType base_dir,
FriBidiLevel *embedding_levels,
FriBidiChar *visual_str,
FriBidiStrIndex *map
);
PARAMETERS
FriBidiFlags flags
Reorder flags.
const FriBidiCharType *bidi_types
Input list of bidi types as returned by
fribidi_get_bidi_types().
Possible values for a const FriBidiCharType are as follows:
FRIBIDI_TYPE_LTR Left-To-Right letter.
FRIBIDI_TYPE_RTL Right-To-Left letter.
FRIBIDI_TYPE_AL Arabic Letter.
FRIBIDI_TYPE_EN European Numeral.
FRIBIDI_TYPE_AN Arabic Numeral.
FRIBIDI_TYPE_ES European number Separator.
FRIBIDI_TYPE_ET European number Terminator.
FRIBIDI_TYPE_CS Common Separator.
FRIBIDI_TYPE_NSM Non Spacing Mark.
FRIBIDI_TYPE_BN Boundary Neutral.
FRIBIDI_TYPE_BS Block Separator.
FRIBIDI_TYPE_SS Segment Separator.
FRIBIDI_TYPE_WS WhiteSpace.
FRIBIDI_TYPE_ON Other Neutral.
FRIBIDI_TYPE_LRE Left-to-Right Embedding.
FRIBIDI_TYPE_RLE Right-to-Left Embedding.
FRIBIDI_TYPE_LRO Left-to-Right Override.
FRIBIDI_TYPE_RLO Right-to-Left Override.
FRIBIDI_TYPE_PDF Pop Directional Flag.
const FriBidiStrIndex len
Input length of the line.
const FriBidiStrIndex off
Input offset of the beginning of the line in the paragraph.
const FriBidiParType base_dir
Resolved paragraph base direction.
Possible values for a const FriBidiParType are as follows:
FRIBIDI_PAR_LTR Left-To-Right paragraph.
FRIBIDI_PAR_RTL Right-To-Left paragraph.
FRIBIDI_PAR_ON DirectiOn-Neutral paragraph.
FRIBIDI_PAR_WLTR Weak Left To Right paragraph.
FRIBIDI_PAR_WRTL Weak Right To Left paragraph.
FriBidiLevel *embedding_levels
Input list of embedding levels, as returned by
fribidi_get_par_embedding_levels.
FriBidiChar *visual_str
Visual string to reorder.
FriBidiStrIndex *map
A map of string indices which is reordered to reflect where each
glyph ends up.
DESCRIPTION
This function reorders the characters in a line of text from logical to
final visual order. This function implements part 4 of rule L1, and
rules L2 and L3 of the Unicode Bidirectional Algorithm available at
http://www.unicode.org/reports/tr9/#Reordering_Resolved_Levels.
As a side effect it also sets position maps if not NULL.
You should provide the resolved paragraph direction and embedding
levels as set by fribidi_get_par_embedding_levels(). Also note that
the embedding levels may change a bit. To be exact, the embedding
level of any sequence of white space at the end of line is reset to the
paragraph embedding level (That is part 4 of rule L1).
Note that the bidi types and embedding levels are not reordered. You
can reorder these (or any other) arrays using the map later. The user
is responsible to initialize map to something sensible, like an
identity mapping, or pass NULL if no map is needed.
There is an optional part to this function, which is whether non-
spacing marks for right-to-left parts of the text should be reordered
to come after their base characters in the visual string or not. Most
rendering engines expect this behavior, but console-based systems for
example do not like it. This is controlled by the
FRIBIDI_FLAG_REORDER_NSM flag. The flag is on in
FRIBIDI_FLAGS_DEFAULT.
RETURNS
Maximum level found in this line plus one, or zero if any error occured
(memory allocation failure most probably).
SEE ALSO
fribidi_charset_to_unicode(3), fribidi_unicode_to_charset(3),
fribidi_parse_charset(3), fribidi_shape_arabic(3),
fribidi_get_par_direction(3), fribidi_get_par_embedding_levels(3),
fribidi_get_bidi_type(3), fribidi_get_bidi_types(3),
fribidi_get_bidi_type_name(3), fribidi_debug_status(3),
fribidi_mirroring_status(3), fribidi_set_mirroring(3),
fribidi_reorder_nsm_status(3), fribidi_set_reorder_nsm(3),
fribidi_log2vis_get_embedding_levels(3), fribidi_get_type(3),
fribidi_get_type_internal(3), fribidi_remove_bidi_marks(3),
fribidi_log2vis(3), fribidi_join_arabic(3),
fribidi_get_joining_type(3), fribidi_get_joining_types(3),
fribidi_get_joining_type_name(3), fribidi_get_mirror_char(3),
fribidi_shape_mirroring(3), fribidi_shape(3)