2000-11-14 21:22:14 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* @(#)GXLayoutEngine.h 1.4 00/03/15
|
|
|
|
*
|
2001-01-19 00:30:17 +00:00
|
|
|
* (C) Copyright IBM Corp. 1998, 1999, 2000, 2001 - All Rights Reserved
|
2000-11-14 21:22:14 +00:00
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
#ifndef __GXLAYOUTENGINE_H
|
|
|
|
#define __GXLAYOUTENGINE_H
|
|
|
|
|
|
|
|
#include "LETypes.h"
|
|
|
|
#include "LEFontInstance.h"
|
|
|
|
#include "LEGlyphFilter.h"
|
|
|
|
#include "LayoutEngine.h"
|
|
|
|
|
|
|
|
#include "MorphTables.h"
|
|
|
|
|
2001-10-16 00:39:01 +00:00
|
|
|
U_NAMESPACE_BEGIN
|
|
|
|
|
2000-11-14 21:22:14 +00:00
|
|
|
/**
|
|
|
|
* 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."
|
|
|
|
*/
|
|
|
|
class GXLayoutEngine : public LayoutEngine
|
|
|
|
{
|
|
|
|
public:
|
2002-04-02 03:33:42 +00:00
|
|
|
/**
|
|
|
|
* 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
|
|
|
|
*/
|
2001-01-19 00:30:17 +00:00
|
|
|
GXLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, const MorphTableHeader *morphTable);
|
2000-11-14 21:22:14 +00:00
|
|
|
|
2002-04-02 03:33:42 +00:00
|
|
|
/**
|
|
|
|
* The destructor, virtual for correct polymorphic invocation.
|
|
|
|
*/
|
2000-11-14 21:22:14 +00:00
|
|
|
virtual ~GXLayoutEngine();
|
|
|
|
|
2002-06-29 00:04:16 +00:00
|
|
|
/**
|
|
|
|
* ICU "poor man's RTTI", returns a UClassID for the actual class.
|
|
|
|
*
|
|
|
|
* @draft ICU 2.2
|
|
|
|
*/
|
|
|
|
virtual inline UClassID getDynamicClassID() const { return getStaticClassID(); }
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ICU "poor man's RTTI", returns a UClassID for this class.
|
|
|
|
*
|
|
|
|
* @draft ICU 2.2
|
|
|
|
*/
|
|
|
|
static inline UClassID getStaticClassID() { return (UClassID)&fgClassID; }
|
|
|
|
|
2000-11-14 21:22:14 +00:00
|
|
|
protected:
|
|
|
|
|
2002-04-02 03:33:42 +00:00
|
|
|
/**
|
|
|
|
* The address of the 'mort' table
|
|
|
|
*/
|
2001-01-19 00:30:17 +00:00
|
|
|
const MorphTableHeader *fMorphTable;
|
2000-11-14 21:22:14 +00:00
|
|
|
|
|
|
|
/**
|
2002-04-02 03:33:42 +00:00
|
|
|
* 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 - true if the text is in a right to left directional run
|
|
|
|
*
|
|
|
|
* Output parameters:
|
|
|
|
* @param glyphs - the glyph index array
|
|
|
|
* @param charIndices - the character index array
|
|
|
|
* @param success - set to an error code if the operation fails
|
|
|
|
*
|
|
|
|
* @return the number of glyphs in the glyph index array
|
|
|
|
*/
|
2000-11-14 21:22:14 +00:00
|
|
|
virtual le_int32 computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
|
2000-12-21 01:18:44 +00:00
|
|
|
LEGlyphID *&glyphs, le_int32 *&charIndices, LEErrorCode &success);
|
2000-11-14 21:22:14 +00:00
|
|
|
|
|
|
|
/**
|
2002-04-02 03:33:42 +00:00
|
|
|
* This method adjusts the glyph positions using the font's
|
|
|
|
* 'kern', 'trak', 'bsln', 'opbd' and 'just' tables.
|
|
|
|
*
|
|
|
|
* Input parameters:
|
|
|
|
* @param glyphs - the input glyph array
|
|
|
|
* @param glyphCount - the number of glyphs in the glyph array
|
|
|
|
* @param x - the starting X position
|
|
|
|
* @param y - the starting Y position
|
|
|
|
*
|
|
|
|
* Output parameters:
|
|
|
|
* @param positions - the output X and Y positions (two entries per glyph)
|
|
|
|
* @param success - set to an error code if the operation fails
|
|
|
|
*/
|
2000-11-14 21:22:14 +00:00
|
|
|
virtual void adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, LEGlyphID glyphs[],
|
2000-12-21 01:18:44 +00:00
|
|
|
le_int32 glyphCount, float positions[], LEErrorCode &success);
|
2002-06-29 00:04:16 +00:00
|
|
|
|
|
|
|
private:
|
|
|
|
|
|
|
|
/**
|
|
|
|
* The address of this static class variable serves as this class's ID
|
|
|
|
* for ICU "poor man's RTTI".
|
|
|
|
*/
|
|
|
|
static const char fgClassID;
|
2000-11-14 21:22:14 +00:00
|
|
|
};
|
|
|
|
|
2001-10-16 00:39:01 +00:00
|
|
|
U_NAMESPACE_END
|
2000-11-14 21:22:14 +00:00
|
|
|
#endif
|
|
|
|
|