| /* |
| * |
| * (C) Copyright IBM Corp. 1998-2008 - 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 |
| * @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 |
| */ |
| TibetanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, |
| le_int32 typoFlags, const 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 |
| */ |
| TibetanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, |
| le_int32 typoFlags, LEErrorCode &success); |
| |
| /** |
| * 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 |
| |