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+
+/*
+ * HanLayoutEngine.h: OpenType processing for Han fonts.
+ *
+ * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved.
+ */
+
+#ifndef __HANLAYOUTENGINE_H
+#define __HANLAYOUTENGINE_H
+
+#include "LETypes.h"
+#include "LEFontInstance.h"
+#include "LayoutEngine.h"
+#include "OpenTypeLayoutEngine.h"
+
+#include "GlyphSubstitutionTables.h"
+
+U_NAMESPACE_BEGIN
+
+class LEGlyphStorage;
+
+/**
+ * This class implements OpenType layout for Han fonts. It overrides
+ * the characerProcessing method to assign the correct OpenType feature
+ * tags for the CJK language-specific forms.
+ *
+ * @internal
+ */
+class HanOpenTypeLayoutEngine : public OpenTypeLayoutEngine
+{
+public:
+ /**
+ * This is the main constructor. It constructs an instance of HanOpenTypeLayoutEngine 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 a
+ * Han 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
+ */
+ HanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
+ le_int32 typoFlags, const GlyphSubstitutionTableHeader *gsubTable);
+
+
+ /**
+ * The destructor, virtual for correct polymorphic invocation.
+ *
+ * @internal
+ */
+ virtual ~HanOpenTypeLayoutEngine();
+
+ /**
+ * ICU "poor man's RTTI", returns a UClassID for the actual class.
+ *
+ * @stable ICU 2.8
+ */
+ virtual UClassID getDynamicClassID() const;
+
+ /**
+ * ICU "poor man's RTTI", returns a UClassID for this class.
+ *
+ * @stable ICU 2.8
+ */
+ static UClassID getStaticClassID();
+
+protected:
+
+ /**
+ * This method does Han OpenType character processing. It assigns the OpenType feature
+ * tags to the characters to generate the correct language-specific variants.
+ *
+ * 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 object holding the glyph storage. The char index and auxillary data arrays will be set.
+ *
+ * Output parameters:
+ * @param outChars - the output character arrayt
+ * @param charIndices - the output character index array
+ * @param featureTags - the output feature tag array
+ * @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