113 lines
3.4 KiB
C++
113 lines
3.4 KiB
C++
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/*
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* HanLayoutEngine.h: OpenType processing for Han fonts.
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*
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* (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved.
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*/
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#ifndef __HANLAYOUTENGINE_H
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#define __HANLAYOUTENGINE_H
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#include "LETypes.h"
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#include "LEFontInstance.h"
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#include "LayoutEngine.h"
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#include "OpenTypeLayoutEngine.h"
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#include "GlyphSubstitutionTables.h"
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U_NAMESPACE_BEGIN
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class LEGlyphStorage;
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/**
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* This class implements OpenType layout for Han fonts. It overrides
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* the characerProcessing method to assign the correct OpenType feature
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* tags for the CJK language-specific forms.
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*
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* @internal
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*/
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class HanOpenTypeLayoutEngine : public OpenTypeLayoutEngine
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{
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public:
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/**
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* This is the main constructor. It constructs an instance of HanOpenTypeLayoutEngine for
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* a particular font, script and language. It takes the GSUB table as a parameter since
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* LayoutEngine::layoutEngineFactory has to read the GSUB table to know that it has a
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* Han OpenType font.
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*
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* @param fontInstance - the font
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* @param scriptCode - the script
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* @param langaugeCode - the language
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* @param gsubTable - the GSUB table
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*
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* @see LayoutEngine::layoutEngineFactory
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* @see OpenTypeLayoutEngine
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* @see ScriptAndLangaugeTags.h for script and language codes
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*
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* @internal
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*/
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HanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
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const GlyphSubstitutionTableHeader *gsubTable);
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/**
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* The destructor, virtual for correct polymorphic invocation.
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*
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* @internal
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*/
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virtual ~HanOpenTypeLayoutEngine();
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/**
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* ICU "poor man's RTTI", returns a UClassID for the actual class.
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*
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* @stable ICU 2.8
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*/
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virtual inline UClassID getDynamicClassID() const { return getStaticClassID(); }
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/**
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* ICU "poor man's RTTI", returns a UClassID for this class.
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*
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* @stable ICU 2.8
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*/
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static inline UClassID getStaticClassID() { return (UClassID)&fgClassID; }
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protected:
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/**
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* This method does Han OpenType character processing. It assigns the OpenType feature
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* tags to the characters to generate the correct language-specific variants.
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*
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* Input parameters:
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* @param chars - the input character context
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* @param offset - the index of the first character to process
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* @param count - the number of characters to process
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* @param max - the number of characters in the input context
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* @param rightToLeft - <code>TRUE</code> if the characters are in a right to left directional run
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* @param glyphStorage - the object holding the glyph storage. The char index and auxillary data arrays will be set.
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*
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* Output parameters:
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* @param outChars - the output character arrayt
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* @param charIndices - the output character index array
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* @param featureTags - the output feature tag array
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* @param success - set to an error code if the operation fails
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*
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* @return the output character count
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*
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* @internal
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*/
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virtual le_int32 characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
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LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success);
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private:
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/**
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* The address of this static class variable serves as this class's ID
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* for ICU "poor man's RTTI".
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*/
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static const char fgClassID;
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};
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U_NAMESPACE_END
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#endif
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