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Diffstat (limited to 'Build/source/libs/icu/icu-xetex/layout/HanLayoutEngine.h')
-rw-r--r-- | Build/source/libs/icu/icu-xetex/layout/HanLayoutEngine.h | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/Build/source/libs/icu/icu-xetex/layout/HanLayoutEngine.h b/Build/source/libs/icu/icu-xetex/layout/HanLayoutEngine.h new file mode 100644 index 00000000000..6f683e1e286 --- /dev/null +++ b/Build/source/libs/icu/icu-xetex/layout/HanLayoutEngine.h @@ -0,0 +1,104 @@ + +/* + * 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 |