1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/textandloc/fontservices/textshaperplugin/IcuSource/layout/ThaiLayoutEngine.h	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,121 @@
     1.4 +
     1.5 +/*
     1.6 + *
     1.7 + * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved
     1.8 + *
     1.9 + */
    1.10 +
    1.11 +#ifndef __THAILAYOUTENGINE_H
    1.12 +#define __THAILAYOUTENGINE_H
    1.13 +
    1.14 +#include "LETypes.h"
    1.15 +#include "LEFontInstance.h"
    1.16 +#include "LayoutEngine.h"
    1.17 +
    1.18 +#include "ThaiShaping.h"
    1.19 +
    1.20 +U_NAMESPACE_BEGIN
    1.21 +
    1.22 +class LEGlyphStorage;
    1.23 +
    1.24 +/**
    1.25 + * This class implements layout for the Thai script, using the ThaiShapingClass.
    1.26 + * All existing Thai fonts use an encoding which assigns character codes to all
    1.27 + * the variant forms needed to display accents and tone marks correctly in context.
    1.28 + * This class can deal with fonts using the Microsoft, Macintosh, and WorldType encodings.
    1.29 + *
    1.30 + * @internal
    1.31 + */
    1.32 +class ThaiLayoutEngine : public LayoutEngine
    1.33 +{
    1.34 +public:
    1.35 +    /**
    1.36 +     * This constructs an instance of ThaiLayoutEngine for the given font, script and
    1.37 +     * language. It examines the font, using LEFontInstance::canDisplay, to set fGlyphSet
    1.38 +     * and fErrorChar. (see below)
    1.39 +     *
    1.40 +     * @param fontInstance - the font
    1.41 +     * @param scriptCode - the script
    1.42 +     * @param languageCode - the language
    1.43 +     *
    1.44 +     * @see LEFontInstance
    1.45 +     * @see ScriptAndLanguageTags.h for script and language codes
    1.46 +     *
    1.47 +     * @internal
    1.48 +     */
    1.49 +    ThaiLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags);
    1.50 +
    1.51 +    /**
    1.52 +     * The destructor, virtual for correct polymorphic invocation.
    1.53 +     *
    1.54 +     * @internal
    1.55 +     */
    1.56 +    virtual ~ThaiLayoutEngine();
    1.57 +
    1.58 +    /**
    1.59 +     * ICU "poor man's RTTI", returns a UClassID for the actual class.
    1.60 +     *
    1.61 +     * @stable ICU 2.8
    1.62 +     */
    1.63 +    virtual UClassID getDynamicClassID() const;
    1.64 +
    1.65 +    /**
    1.66 +     * ICU "poor man's RTTI", returns a UClassID for this class.
    1.67 +     *
    1.68 +     * @stable ICU 2.8
    1.69 +     */
    1.70 +    static UClassID getStaticClassID();
    1.71 +
    1.72 +protected:
    1.73 +    /**
    1.74 +     * A small integer indicating which Thai encoding
    1.75 +     * the font uses.
    1.76 +     *
    1.77 +     * @see ThaiShaping
    1.78 +     *
    1.79 +     * @internal
    1.80 +     */
    1.81 +    le_uint8 fGlyphSet;
    1.82 +
    1.83 +    /**
    1.84 +     * The character used as a base for vowels and
    1.85 +     * tone marks that are out of sequence. Usually
    1.86 +     * this will be Unicode 0x25CC, if the font can
    1.87 +     * display it.
    1.88 +     *
    1.89 +     * @see ThaiShaping
    1.90 +     *
    1.91 +     * @internal
    1.92 +     */
    1.93 +    LEUnicode fErrorChar;
    1.94 +
    1.95 +    /**
    1.96 +     * This method performs Thai layout. It calls ThaiShaping::compose to
    1.97 +     * generate the correct contextual character codes, and then calls
    1.98 +     * mapCharsToGlyphs to generate the glyph indices.
    1.99 +     *
   1.100 +     * Input parameters:
   1.101 +     * @param chars - the input character context
   1.102 +     * @param offset - the index of the first character to process
   1.103 +     * @param count - the number of characters to process
   1.104 +     * @param max - the number of characters in the input context
   1.105 +     * @param rightToLeft - <code>TRUE</code> if the text is in a right to left directional run
   1.106 +     * @param glyphStorage - the glyph storage object. The glyph and char index arrays will be set.
   1.107 +     *
   1.108 +     * Output parameters:
   1.109 +     * @param success - set to an error code if the operation fails
   1.110 +     *
   1.111 +     * @return the number of glyphs in the glyph index array
   1.112 +     *
   1.113 +     * @see ThaiShaping
   1.114 +     *
   1.115 +     * @internal
   1.116 +     */
   1.117 +    virtual le_int32 computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
   1.118 +        LEGlyphStorage &glyphStorage, LEErrorCode &success);
   1.119 +
   1.120 +};
   1.121 +
   1.122 +U_NAMESPACE_END
   1.123 +#endif
   1.124 +