/* * * (C) Copyright IBM Corp. 1998-2014 - All Rights Reserved * * This file is a modification of the ICU file IndicLayoutEngine.h * by Jens Herden and Javier Sola for Khmer language * */ #ifndef __KHMERLAYOUTENGINE_H #define __KHMERLAYOUTENGINE_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 Khmer OpenType fonts, as * specified by Microsoft in "Creating and Supporting OpenType Fonts for * Khmer Scripts" (http://www.microsoft.com/typography/otspec/indicot/default.htm) TODO: change url * * This class overrides the characterProcessing method to do Khmer character processing * and reordering (See the MS spec. for more details) * * @internal */ class KhmerOpenTypeLayoutEngine : public OpenTypeLayoutEngine { public: /** * This is the main constructor. It constructs an instance of KhmerOpenTypeLayoutEngine 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 * Khmer OpenType font. * * @param fontInstance - the font * @param scriptCode - the script * @param langaugeCode - the language * @param gsubTable - the GSUB table * @param success - set to an error code if the operation fails * * @see LayoutEngine::layoutEngineFactory * @see OpenTypeLayoutEngine * @see ScriptAndLangaugeTags.h for script and language codes * * @internal */ KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags, const LEReferenceTo<GlyphSubstitutionTableHeader> &gsubTable, LEErrorCode &success); /** * 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 * @param success - set to an error code if the operation fails * * @see OpenTypeLayoutEngine * @see ScriptAndLangaugeTags.h for script and language codes * * @internal */ KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags, LEErrorCode &success); /** * The destructor, virtual for correct polymorphic invocation. * * @internal */ virtual ~KhmerOpenTypeLayoutEngine(); /** * ICU "poor man's RTTI", returns a UClassID for the actual class. * * @deprecated ICU 54. See {@link icu::LayoutEngine} */ virtual UClassID getDynamicClassID() const; /** * ICU "poor man's RTTI", returns a UClassID for this class. * * @deprecated ICU 54. See {@link icu::LayoutEngine} */ static UClassID getStaticClassID(); protected: /** * This method does Khmer 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