| |
| /* |
| * HanLayoutEngine.h: OpenType processing for Han fonts. |
| * |
| * (C) Copyright IBM Corp. 1998 - 2003 - All Rights Reserved. |
| * |
| * $Source: /xsrl/Nsvn/icu/icu/source/layout/HanLayoutEngine.h,v $ $Date: 2003/04/12 00:37:11 $ $Revision: 1.1 $ |
| */ |
| |
| #ifndef __HANLAYOUTENGINE_H |
| #define __HANLAYOUTENGINE_H |
| |
| #include "LETypes.h" |
| #include "LEFontInstance.h" |
| #include "LayoutEngine.h" |
| #include "OpenTypeLayoutEngine.h" |
| |
| #include "GlyphSubstitutionTables.h" |
| |
| U_NAMESPACE_BEGIN |
| |
| /** |
| * 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, |
| 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. |
| * |
| * @draft ICU 2.2 |
| */ |
| virtual inline UClassID getDynamicClassID() const { return getStaticClassID(); } |
| |
| /** |
| * ICU "poor man's RTTI", returns a UClassID for this class. |
| * |
| * @draft ICU 2.2 |
| */ |
| static inline UClassID getStaticClassID() { return (UClassID)&fgClassID; } |
| |
| 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 - true if the characters are in a right to left directional run |
| * |
| * 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, le_int32 *&charIndices, const LETag **&featureTags, LEErrorCode &success); |
| |
| |
| private: |
| |
| /** |
| * The address of this static class variable serves as this class's ID |
| * for ICU "poor man's RTTI". |
| */ |
| static const char fgClassID; |
| }; |
| |
| U_NAMESPACE_END |
| #endif |