1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/textandloc/fontservices/textshaperplugin/IcuSource/layout/HanLayoutEngine.h	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,104 @@
     1.4 +
     1.5 +/*
     1.6 + * HanLayoutEngine.h: OpenType processing for Han fonts.
     1.7 + *
     1.8 + * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved.
     1.9 + */
    1.10 +
    1.11 +#ifndef __HANLAYOUTENGINE_H
    1.12 +#define __HANLAYOUTENGINE_H
    1.13 +
    1.14 +#include "LETypes.h"
    1.15 +#include "LEFontInstance.h"
    1.16 +#include "LayoutEngine.h"
    1.17 +#include "OpenTypeLayoutEngine.h"
    1.18 +
    1.19 +#include "GlyphSubstitutionTables.h"
    1.20 +
    1.21 +U_NAMESPACE_BEGIN
    1.22 +
    1.23 +class LEGlyphStorage;
    1.24 +
    1.25 +/**
    1.26 + * This class implements OpenType layout for Han fonts. It overrides
    1.27 + * the characerProcessing method to assign the correct OpenType feature
    1.28 + * tags for the CJK language-specific forms.
    1.29 + *
    1.30 + * @internal
    1.31 + */
    1.32 +class HanOpenTypeLayoutEngine : public OpenTypeLayoutEngine
    1.33 +{
    1.34 +public:
    1.35 +    /**
    1.36 +     * This is the main constructor. It constructs an instance of HanOpenTypeLayoutEngine for
    1.37 +     * a particular font, script and language. It takes the GSUB table as a parameter since
    1.38 +     * LayoutEngine::layoutEngineFactory has to read the GSUB table to know that it has a
    1.39 +     * Han OpenType font.
    1.40 +     *
    1.41 +     * @param fontInstance - the font
    1.42 +     * @param scriptCode - the script
    1.43 +     * @param langaugeCode - the language
    1.44 +     * @param gsubTable - the GSUB table
    1.45 +     *
    1.46 +     * @see LayoutEngine::layoutEngineFactory
    1.47 +     * @see OpenTypeLayoutEngine
    1.48 +     * @see ScriptAndLangaugeTags.h for script and language codes
    1.49 +     *
    1.50 +     * @internal
    1.51 +     */
    1.52 +    HanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
    1.53 +                            le_int32 typoFlags, const GlyphSubstitutionTableHeader *gsubTable);
    1.54 +
    1.55 +
    1.56 +    /**
    1.57 +     * The destructor, virtual for correct polymorphic invocation.
    1.58 +     *
    1.59 +     * @internal
    1.60 +     */
    1.61 +    virtual ~HanOpenTypeLayoutEngine();
    1.62 +
    1.63 +    /**
    1.64 +     * ICU "poor man's RTTI", returns a UClassID for the actual class.
    1.65 +     *
    1.66 +     * @stable ICU 2.8
    1.67 +     */
    1.68 +    virtual UClassID getDynamicClassID() const;
    1.69 +
    1.70 +    /**
    1.71 +     * ICU "poor man's RTTI", returns a UClassID for this class.
    1.72 +     *
    1.73 +     * @stable ICU 2.8
    1.74 +     */
    1.75 +    static UClassID getStaticClassID();
    1.76 +
    1.77 +protected:
    1.78 +
    1.79 +    /**
    1.80 +     * This method does Han OpenType character processing. It assigns the OpenType feature
    1.81 +     * tags to the characters to generate the correct language-specific variants.
    1.82 +     *
    1.83 +     * Input parameters:
    1.84 +     * @param chars - the input character context
    1.85 +     * @param offset - the index of the first character to process
    1.86 +     * @param count - the number of characters to process
    1.87 +     * @param max - the number of characters in the input context
    1.88 +     * @param rightToLeft - <code>TRUE</code> if the characters are in a right to left directional run
    1.89 +     * @param glyphStorage - the object holding the glyph storage. The char index and auxillary data arrays will be set.
    1.90 +     *
    1.91 +     * Output parameters:
    1.92 +     * @param outChars - the output character arrayt
    1.93 +     * @param charIndices - the output character index array
    1.94 +     * @param featureTags - the output feature tag array
    1.95 +     * @param success - set to an error code if the operation fails
    1.96 +     *
    1.97 +     * @return the output character count
    1.98 +     *
    1.99 +     * @internal
   1.100 +     */
   1.101 +    virtual le_int32 characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
   1.102 +            LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success);
   1.103 +
   1.104 +};
   1.105 +
   1.106 +U_NAMESPACE_END
   1.107 +#endif