diff options
Diffstat (limited to 'Build/source/libs/icu/icu-xetex/layout/GXLayoutEngine.h')
-rw-r--r-- | Build/source/libs/icu/icu-xetex/layout/GXLayoutEngine.h | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/Build/source/libs/icu/icu-xetex/layout/GXLayoutEngine.h b/Build/source/libs/icu/icu-xetex/layout/GXLayoutEngine.h new file mode 100644 index 00000000000..faa511ab1ab --- /dev/null +++ b/Build/source/libs/icu/icu-xetex/layout/GXLayoutEngine.h @@ -0,0 +1,125 @@ + +/* + * + * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved + * + */ + +#ifndef __GXLAYOUTENGINE_H +#define __GXLAYOUTENGINE_H + +#include "LETypes.h" +#include "LayoutEngine.h" + +#include "MorphTables.h" + +U_NAMESPACE_BEGIN + +class LEFontInstance; +class LEGlyphStorage; + +/** + * This class implements layout for QuickDraw GX or Apple Advanced Typograyph (AAT) + * fonts. A font is a GX or AAT font if it contains a 'mort' table. See Apple's + * TrueType Reference Manual (http://fonts.apple.com/TTRefMan/index.html) for details. + * Information about 'mort' tables is in the chapter titled "Font Files." + * + * @internal + */ +class GXLayoutEngine : public LayoutEngine +{ +public: + /** + * This is the main constructor. It constructs an instance of GXLayoutEngine for + * a particular font, script and language. It takes the 'mort' table as a parameter since + * LayoutEngine::layoutEngineFactory has to read the 'mort' table to know that it has a + * GX font. + * + * Note: GX and AAT fonts don't contain any script and language specific tables, so + * the script and language are ignored. + * + * @param fontInstance - the font + * @param scriptCode - the script + * @param langaugeCode - the language + * @param morphTable - the 'mort' table + * + * @see LayoutEngine::layoutEngineFactory + * @see ScriptAndLangaugeTags.h for script and language codes + * + * @internal + */ + GXLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, const MorphTableHeader *morphTable); + + /** + * The destructor, virtual for correct polymorphic invocation. + * + * @internal + */ + virtual ~GXLayoutEngine(); + + /** + * 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: + + /** + * The address of the 'mort' table + * + * @internal + */ + const MorphTableHeader *fMorphTable; + + /** + * This method does GX layout using the font's 'mort' table. It converts the + * input character codes to glyph indices using mapCharsToGlyphs, and then + * applies the 'mort' table. + * + * 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 text is in a right to left directional run + * @param glyphStorage - the glyph storage object. The glyph and char index arrays will be set. + * + * Output parameters: + * @param success - set to an error code if the operation fails + * + * @return the number of glyphs in the glyph index array + * + * @internal + */ + virtual le_int32 computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, + LEGlyphStorage &glyphStorage, LEErrorCode &success); + + /** + * This method adjusts the glyph positions using the font's + * 'kern', 'trak', 'bsln', 'opbd' and 'just' tables. + * + * Input parameters: + * @param glyphStorage - the object holding the glyph storage. The positions will be updated as needed. + * + * Output parameters: + * @param success - set to an error code if the operation fails + * + * @internal + */ + virtual void adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, + LEGlyphStorage &glyphStorage, LEErrorCode &success); + +}; + +U_NAMESPACE_END +#endif + |