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Diffstat (limited to 'Build/source/libs/icu/icu-xetex/layout/KhmerLayoutEngine.h')
-rw-r--r-- | Build/source/libs/icu/icu-xetex/layout/KhmerLayoutEngine.h | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/Build/source/libs/icu/icu-xetex/layout/KhmerLayoutEngine.h b/Build/source/libs/icu/icu-xetex/layout/KhmerLayoutEngine.h new file mode 100644 index 00000000000..56b79e975ed --- /dev/null +++ b/Build/source/libs/icu/icu-xetex/layout/KhmerLayoutEngine.h @@ -0,0 +1,129 @@ + +/* + * + * (C) Copyright IBM Corp. 1998-2005 - 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 + * + * @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 GlyphSubstitutionTableHeader *gsubTable); + + /** + * 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 + * + * @see OpenTypeLayoutEngine + * @see ScriptAndLangaugeTags.h for script and language codes + * + * @internal + */ + KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, + le_int32 typoFlags); + + /** + * The destructor, virtual for correct polymorphic invocation. + * + * @internal + */ + virtual ~KhmerOpenTypeLayoutEngine(); + + /** + * 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 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 + |