--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/fontservices/textshaperplugin/IcuSource/layout/GXLayoutEngine.h	Tue Feb 02 02:02:46 2010 +0200
@@ -0,0 +1,125 @@
+
+/*
+ *
+ * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
+ *
+ */
+
+#ifndef __GXLAYOUTENGINE_H
+#define __GXLAYOUTENGINE_H
+
+#include "LETypes.h"
+#include "LayoutEngine.h"
+
+#include "MorphTables.h"
+
+U_NAMESPACE_BEGIN
+
+class LEFontInstance;
+class LEGlyphStorage;
+
+/**
+ * This class implements layout for QuickDraw GX or Apple Advanced Typograyph (AAT)
+ * fonts. A font is a GX or AAT font if it contains a 'mort' table. See Apple's
+ * TrueType Reference Manual (http://fonts.apple.com/TTRefMan/index.html) for details.
+ * Information about 'mort' tables is in the chapter titled "Font Files."
+ *
+ * @internal
+ */
+class GXLayoutEngine : public LayoutEngine
+{
+public:
+    /**
+     * This is the main constructor. It constructs an instance of GXLayoutEngine for
+     * a particular font, script and language. It takes the 'mort' table as a parameter since
+     * LayoutEngine::layoutEngineFactory has to read the 'mort' table to know that it has a
+     * GX font.
+     *
+     * Note: GX and AAT fonts don't contain any script and language specific tables, so
+     * the script and language are ignored.
+     *
+     * @param fontInstance - the font
+     * @param scriptCode - the script
+     * @param langaugeCode - the language
+     * @param morphTable - the 'mort' table
+     *
+     * @see LayoutEngine::layoutEngineFactory
+     * @see ScriptAndLangaugeTags.h for script and language codes
+     *
+     * @internal
+     */
+    GXLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, const MorphTableHeader *morphTable);
+
+    /**
+     * The destructor, virtual for correct polymorphic invocation.
+     *
+     * @internal
+     */
+    virtual ~GXLayoutEngine();
+
+    /**
+     * 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:
+
+    /**
+     * The address of the 'mort' table
+     *
+     * @internal
+     */
+    const MorphTableHeader *fMorphTable;
+
+    /**
+     * This method does GX layout using the font's 'mort' table. It converts the
+     * input character codes to glyph indices using mapCharsToGlyphs, and then
+     * applies the 'mort' table.
+     *
+     * 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 text is in a right to left directional run
+     * @param glyphStorage - the glyph storage object. The glyph and char index arrays will be set.
+     *
+     * Output parameters:
+     * @param success - set to an error code if the operation fails
+     *
+     * @return the number of glyphs in the glyph index array
+     *
+     * @internal
+     */
+    virtual le_int32 computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
+        LEGlyphStorage &glyphStorage, LEErrorCode &success);
+
+    /**
+     * This method adjusts the glyph positions using the font's
+     * 'kern', 'trak', 'bsln', 'opbd' and 'just' tables.
+     *
+     * Input parameters:
+     * @param glyphStorage - the object holding the glyph storage. The positions will be updated as needed.
+     *
+     * Output parameters:
+     * @param success - set to an error code if the operation fails
+     *
+     * @internal
+     */
+    virtual void adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse,
+                                      LEGlyphStorage &glyphStorage, LEErrorCode &success);
+
+};
+
+U_NAMESPACE_END
+#endif
+