1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/textandloc/fontservices/textshaperplugin/IcuSource/layout/KhmerLayoutEngine.h	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,129 @@
     1.4 +
     1.5 +/*
     1.6 + *
     1.7 + * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved 
     1.8 + *
     1.9 + * This file is a modification of the ICU file IndicLayoutEngine.h
    1.10 + * by Jens Herden and Javier Sola for Khmer language 
    1.11 + *
    1.12 + */
    1.13 +
    1.14 +#ifndef __KHMERLAYOUTENGINE_H
    1.15 +#define __KHMERLAYOUTENGINE_H
    1.16 +
    1.17 +// #include "LETypes.h"
    1.18 +// #include "LEFontInstance.h"
    1.19 +// #include "LEGlyphFilter.h"
    1.20 +// #include "LayoutEngine.h"
    1.21 +// #include "OpenTypeLayoutEngine.h"
    1.22 +
    1.23 +// #include "GlyphSubstitutionTables.h"
    1.24 +// #include "GlyphDefinitionTables.h"
    1.25 +// #include "GlyphPositioningTables.h"
    1.26 +
    1.27 +U_NAMESPACE_BEGIN
    1.28 +
    1.29 +// class MPreFixups;
    1.30 +// class LEGlyphStorage;
    1.31 +
    1.32 +/**
    1.33 + * This class implements OpenType layout for Khmer OpenType fonts, as
    1.34 + * specified by Microsoft in "Creating and Supporting OpenType Fonts for
    1.35 + * Khmer Scripts" (http://www.microsoft.com/typography/otspec/indicot/default.htm) TODO: change url
    1.36 + *
    1.37 + * This class overrides the characterProcessing method to do Khmer character processing
    1.38 + * and reordering (See the MS spec. for more details)
    1.39 + *
    1.40 + * @internal
    1.41 + */
    1.42 +class KhmerOpenTypeLayoutEngine : public OpenTypeLayoutEngine
    1.43 +{
    1.44 +public:
    1.45 +    /**
    1.46 +     * This is the main constructor. It constructs an instance of KhmerOpenTypeLayoutEngine for
    1.47 +     * a particular font, script and language. It takes the GSUB table as a parameter since
    1.48 +     * LayoutEngine::layoutEngineFactory has to read the GSUB table to know that it has an
    1.49 +     * Khmer OpenType font.
    1.50 +     *
    1.51 +     * @param fontInstance - the font
    1.52 +     * @param scriptCode - the script
    1.53 +     * @param langaugeCode - the language
    1.54 +     * @param gsubTable - the GSUB table
    1.55 +     *
    1.56 +     * @see LayoutEngine::layoutEngineFactory
    1.57 +     * @see OpenTypeLayoutEngine
    1.58 +     * @see ScriptAndLangaugeTags.h for script and language codes
    1.59 +     *
    1.60 +     * @internal
    1.61 +     */
    1.62 +    KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
    1.63 +                            le_int32 typoFlags, const GlyphSubstitutionTableHeader *gsubTable);
    1.64 +
    1.65 +    /**
    1.66 +     * This constructor is used when the font requires a "canned" GSUB table which can't be known
    1.67 +     * until after this constructor has been invoked.
    1.68 +     *
    1.69 +     * @param fontInstance - the font
    1.70 +     * @param scriptCode - the script
    1.71 +     * @param langaugeCode - the language
    1.72 +     *
    1.73 +     * @see OpenTypeLayoutEngine
    1.74 +     * @see ScriptAndLangaugeTags.h for script and language codes
    1.75 +     *
    1.76 +     * @internal
    1.77 +     */
    1.78 +    KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
    1.79 +			      le_int32 typoFlags);
    1.80 +
    1.81 +    /**
    1.82 +     * The destructor, virtual for correct polymorphic invocation.
    1.83 +     *
    1.84 +     * @internal
    1.85 +     */
    1.86 +   virtual ~KhmerOpenTypeLayoutEngine();
    1.87 +
    1.88 +    /**
    1.89 +     * ICU "poor man's RTTI", returns a UClassID for the actual class.
    1.90 +     *
    1.91 +     * @stable ICU 2.8
    1.92 +     */
    1.93 +    virtual UClassID getDynamicClassID() const;
    1.94 +
    1.95 +    /**
    1.96 +     * ICU "poor man's RTTI", returns a UClassID for this class.
    1.97 +     *
    1.98 +     * @stable ICU 2.8
    1.99 +     */
   1.100 +    static UClassID getStaticClassID();
   1.101 +
   1.102 +protected:
   1.103 +
   1.104 +    /**
   1.105 +     * This method does Khmer OpenType character processing. It assigns the OpenType feature
   1.106 +     * tags to the characters, and may generate output characters which have been reordered. 
   1.107 +     * It may also split some vowels, resulting in more output characters than input characters.
   1.108 +     *
   1.109 +     * Input parameters:
   1.110 +     * @param chars - the input character context
   1.111 +     * @param offset - the index of the first character to process
   1.112 +     * @param count - the number of characters to process
   1.113 +     * @param max - the number of characters in the input context
   1.114 +     * @param rightToLeft - <code>TRUE</code> if the characters are in a right to left directional run
   1.115 +     * @param glyphStorage - the glyph storage object. The glyph and character index arrays will be set.
   1.116 +     *                       the auxillary data array will be set to the feature tags.
   1.117 +     *
   1.118 +     * Output parameters:
   1.119 +     * @param success - set to an error code if the operation fails
   1.120 +     *
   1.121 +     * @return the output character count
   1.122 +     *
   1.123 +     * @internal
   1.124 +     */
   1.125 +    virtual le_int32 characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
   1.126 +            LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success);
   1.127 +
   1.128 +};
   1.129 +
   1.130 +U_NAMESPACE_END
   1.131 +#endif
   1.132 +