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include/mupdf/fitz/bidi.h

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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