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+/*
+ *
+ * (C) Copyright IBM Corp. 1998-2007 - All Rights Reserved 
+ *
+ * Developed at DIT - Government of Bhutan
+ *
+ * Contact person: Pema Geyleg - <pema_geyleg@druknet.bt> 
+ *
+ * This file is a modification of the ICU file KhmerReordering.cpp
+ * by Jens Herden and Javier Sola who have given all their possible rights to IBM and the Governement of Bhutan
+ * A first module for Dzongkha was developed by Karunakar under Panlocalisation funding.
+ * Assistance for this module has been received from Namgay Thinley, Christopher Fynn and Javier Sola
+ *
+ */
+
+#ifndef __TIBETANLAYOUTENGINE_H
+#define __TIBETANLAYOUTENGINE_H
+
+// #include "LETypes.h"
+// #include "LEFontInstance.h"
+// #include "LEGlyphFilter.h"
+// #include "LayoutEngine.h"
+// #include "OpenTypeLayoutEngine.h"
+
+// #include "GlyphSubstitutionTables.h"
+// #include "GlyphDefinitionTables.h"
+// #include "GlyphPositioningTables.h"
+
+U_NAMESPACE_BEGIN
+
+// class MPreFixups;
+// class LEGlyphStorage;
+
+/**
+ * This class implements OpenType layout for Dzongkha and Tibetan OpenType fonts
+ *
+ * @internal
+ */
+class TibetanOpenTypeLayoutEngine : public OpenTypeLayoutEngine
+{
+public:
+    /**
+     * This is the main constructor. It constructs an instance of TibetanOpenTypeLayoutEngine for
+     * a particular font, script and language. It takes the GSUB table as a parameter since
+     * LayoutEngine::layoutEngineFactory has to read the GSUB table to know that it has an
+     * Tibetan OpenType font.
+     *
+     * @param fontInstance - the font
+     * @param scriptCode - the script
+     * @param langaugeCode - the language
+     * @param gsubTable - the GSUB table
+     *
+     * @see LayoutEngine::layoutEngineFactory
+     * @see OpenTypeLayoutEngine
+     * @see ScriptAndLangaugeTags.h for script and language codes
+     *
+     * @internal
+     */
+    TibetanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
+                            le_int32 typoFlags, const GlyphSubstitutionTableHeader *gsubTable);
+
+    /**
+     * This constructor is used when the font requires a "canned" GSUB table which can't be known
+     * until after this constructor has been invoked.
+     *
+     * @param fontInstance - the font
+     * @param scriptCode - the script
+     * @param langaugeCode - the language
+     *
+     * @see OpenTypeLayoutEngine
+     * @see ScriptAndLangaugeTags.h for script and language codes
+     *
+     * @internal
+     */
+    TibetanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
+                                le_int32 typoFlags);
+
+    /**
+     * The destructor, virtual for correct polymorphic invocation.
+     *
+     * @internal
+     */
+   virtual ~TibetanOpenTypeLayoutEngine();
+
+    /**
+     * ICU "poor man's RTTI", returns a UClassID for the actual class.
+     *
+     * @internal ICU 3.6
+     */
+    virtual UClassID getDynamicClassID() const;
+
+    /**
+     * ICU "poor man's RTTI", returns a UClassID for this class.
+     *
+     * @internal ICU 3.6
+     */
+    static UClassID getStaticClassID();
+
+protected:
+
+    /**
+     * This method does Tibetan OpenType character processing. It assigns the OpenType feature
+     * tags to the characters, and may generate output characters which have been reordered. 
+     * It may also split some vowels, resulting in more output characters than input characters.
+     *
+     * Input parameters:
+     * @param chars - the input character context
+     * @param offset - the index of the first character to process
+     * @param count - the number of characters to process
+     * @param max - the number of characters in the input context
+     * @param rightToLeft - <code>TRUE</code> if the characters are in a right to left directional run
+     * @param glyphStorage - the glyph storage object. The glyph and character index arrays will be set.
+     *                       the auxillary data array will be set to the feature tags.
+     *
+     * Output parameters:
+     * @param success - set to an error code if the operation fails
+     *
+     * @return the output character count
+     *
+     * @internal
+     */
+    virtual le_int32 characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
+            LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success);
+
+};
+
+U_NAMESPACE_END
+#endif
+