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/****************************************************************************
**
** ???
**
** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the kernel module of the Qt GUI Toolkit.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free Qt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with
** the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/
#ifndef QTEXTENGINE_P_H
#define QTEXTENGINE_P_H
#ifndef QT_H
#include "qglobal.h"
#include "qstring.h"
#include "qnamespace.h"
#include <private/qfontdata_p.h>
#endif // QT_H
#include <stdlib.h>
#ifndef Q_OS_TEMP
#include <assert.h>
#endif // Q_OS_TEMP
class QFontPrivate;
class QString;
class QOpenType;
class QPainter;
// this uses the same coordinate system as Qt, but a different one to freetype and Xft.
// * y is usually negative, and is equal to the ascent.
// * negative yoff means the following stuff is drawn higher up.
// the characters bounding rect is given by QRect( x,y,width,height), it's advance by
// xoo and yoff
struct glyph_metrics_t
{
inline glyph_metrics_t() {
x = 100000;
y = 100000;
width = 0;
height = 0;
xoff = 0;
yoff = 0;
}
inline glyph_metrics_t( int _x, int _y, int _width, int _height, int _xoff, int _yoff ) {
x = _x;
y = _y;
width = _width;
height = _height;
xoff = _xoff;
yoff = _yoff;
}
int x;
int y;
int width;
int height;
int xoff;
int yoff;
};
#if defined( Q_WS_X11 ) || defined ( Q_WS_QWS )
typedef unsigned short glyph_t;
struct qoffset_t {
short x;
short y;
};
typedef int advance_t;
struct QScriptAnalysis
{
unsigned short script : 7;
unsigned short bidiLevel : 6; // Unicode Bidi algorithm embedding level (0-61)
unsigned short override : 1; // Set when in LRO/RLO embedding
unsigned short reserved : 2;
bool operator == ( const QScriptAnalysis &other ) {
return
script == other.script &&
bidiLevel == other.bidiLevel;
// ###
// && override == other.override;
}
};
#elif defined( Q_WS_MAC )
typedef unsigned short glyph_t;
struct qoffset_t {
short x;
short y;
};
typedef int advance_t;
struct QScriptAnalysis
{
unsigned short script : 7;
unsigned short bidiLevel : 6; // Unicode Bidi algorithm embedding level (0-61)
unsigned short override : 1; // Set when in LRO/RLO embedding
unsigned short reserved : 2;
bool operator == ( const QScriptAnalysis &other ) {
return
script == other.script &&
bidiLevel == other.bidiLevel;
// ###
// && override == other.override;
}
};
#elif defined( Q_WS_WIN )
// do not change the definitions below unless you know what you are doing!
// it is designed to be compatible with the types found in uniscribe.
typedef unsigned short glyph_t;
struct qoffset_t {
int x;
int y;
};
typedef int advance_t;
struct QScriptAnalysis {
unsigned short script :10;
unsigned short rtl :1;
unsigned short layoutRTL :1;
unsigned short linkBefore :1;
unsigned short linkAfter :1;
unsigned short logicalOrder :1;
unsigned short noGlyphIndex :1;
unsigned short bidiLevel :5;
unsigned short override :1;
unsigned short inhibitSymSwap :1;
unsigned short charShape :1;
unsigned short digitSubstitute :1;
unsigned short inhibitLigate :1;
unsigned short fDisplayZWG :1;
unsigned short arabicNumContext :1;
unsigned short gcpClusters :1;
unsigned short reserved :1;
unsigned short engineReserved :2;
};
inline bool operator == ( const QScriptAnalysis &sa1, const QScriptAnalysis &sa2 )
{
return
sa1.script == sa2.script &&
sa1.bidiLevel == sa2.bidiLevel;
// ###
// && override == other.override;
}
#endif
// enum and struct are made to be compatible with Uniscribe, dont change unless you know what you're doing.
struct GlyphAttributes {
// highest value means highest priority for justification. Justification is done by first inserting kashidas
// starting with the highest priority positions, then stretching spaces, afterwards extending inter char
// spacing, and last spacing between arabic words.
// NoJustification is for example set for arabic where no Kashida can be inserted or for diacritics.
enum Justification {
NoJustification= 0, // Justification can't be applied after this glyph
Arabic_Space = 1, // This glyph represents a space inside arabic text
Character = 2, // Inter-character justification point follows this glyph
Space = 4, // This glyph represents a blank outside an Arabic run
Arabic_Normal = 7, // Normal Middle-Of-Word glyph that connects to the right (begin)
Arabic_Waw = 8, // Next character is final form of Waw/Ain/Qaf/Fa
Arabic_BaRa = 9, // Next two chars are Ba + Ra/Ya/AlefMaksura
Arabic_Alef = 10, // Next character is final form of Alef/Tah/Lam/Kaf/Gaf
Arabic_HaaDal = 11, // Next character is final form of Haa/Dal/Taa Marbutah
Arabic_Seen = 12, // Initial or Medial form Of Seen/Sad
Arabic_Kashida = 13 // Kashida(U+640) in middle of word
};
unsigned short justification :4; // Justification class
unsigned short clusterStart :1; // First glyph of representation of cluster
unsigned short mark :1; // needs to be positioned around base char
unsigned short zeroWidth :1; // ZWJ, ZWNJ etc, with no width, currently used as "Don't print" for ZWSP
unsigned short reserved :1;
unsigned short combiningClass :8;
};
// also this is compatible to uniscribe. Do not change.
struct QCharAttributes {
uchar softBreak :1; // Potential linebreak point _before_ this character
uchar whiteSpace :1; // A unicode whitespace character, except NBSP, ZWNBSP
uchar charStop :1; // Valid cursor position (for left/right arrow)
uchar wordStop :1; // Valid cursor position (for ctrl + left/right arrow)
uchar invalid :1;
uchar reserved :3;
};
inline bool qIsZeroWidthChar(ushort uc)
{
return (uc >= 0x200b && uc <= 0x200f /* ZW Space, ZWNJ, ZWJ, LRM and RLM */)
|| (uc >= 0x2028 && uc <= 0x202f /* LS, PS, LRE, RLE, PDF, LRO, RLO, NNBSP */)
|| (uc >= 0x206a && uc <= 0x206f /* ISS, ASS, IAFS, AFS, NADS, NODS */);
}
class QFontEngine;
struct QScriptItem
{
inline QScriptItem() : position( 0 ), isSpace( FALSE ), isTab( FALSE ),
isObject( FALSE ), hasPositioning( FALSE ),
descent( -1 ), ascent( -1 ), width( -1 ),
x( 0 ), y( 0 ), num_glyphs( 0 ), glyph_data_offset( 0 ),
fontEngine( 0 ) { }
int position;
QScriptAnalysis analysis;
unsigned short isSpace : 1;
unsigned short isTab : 1;
unsigned short isObject : 1;
unsigned short hasPositioning : 1;
unsigned short complex : 1; // Windows only
unsigned short private_use : 1; // Windows only
unsigned short reserved : 10;
short descent;
int ascent;
int width;
int x;
int y;
int num_glyphs;
int glyph_data_offset;
QFontEngine *fontEngine;
};
struct QScriptItemArrayPrivate
{
unsigned int alloc;
unsigned int size;
QScriptItem items[1];
};
class QScriptItemArray
{
public:
QScriptItemArray() : d( 0 ) {}
~QScriptItemArray();
inline QScriptItem &operator[] (int i) const {return d->items[i]; }
inline void append( const QScriptItem &item ) {
if ( d->size == d->alloc )
resize( d->size + 1 );
d->items[d->size] = item;
d->size++;
}
inline int size() const { return d ? d->size : 0; }
void resize( int s );
void clear();
QScriptItemArrayPrivate *d;
private:
#ifdef Q_DISABLE_COPY
QScriptItemArray( const QScriptItemArray & );
QScriptItemArray &operator = ( const QScriptItemArray & );
#endif
};
class QFontPrivate;
class Q_EXPORT QTextEngine {
public:
QTextEngine( const QString &str, QFontPrivate *f );
~QTextEngine();
enum Mode {
Full = 0x00,
NoBidi = 0x01,
SingleLine = 0x02,
WidthOnly = 0x07
};
void itemize( int mode = Full );
static void bidiReorder( int numRuns, const Q_UINT8 *levels, int *visualOrder );
const QCharAttributes *attributes();
void shape( int item ) const;
// ### we need something for justification
enum Edge {
Leading,
Trailing
};
enum ShaperFlag {
RightToLeft = 0x0001,
Mirrored = 0x0001
};
int width( int charFrom, int numChars ) const;
glyph_metrics_t boundingBox( int from, int len ) const;
QScriptItemArray items;
QString string;
QFontPrivate *fnt;
int lineWidth;
int widthUsed;
int firstItemInLine;
int currentItem;
QChar::Direction direction : 5;
unsigned int haveCharAttributes : 1;
unsigned int widthOnly : 1;
unsigned int reserved : 25;
int length( int item ) const {
const QScriptItem &si = items[item];
int from = si.position;
item++;
return ( item < items.size() ? items[item].position : string.length() ) - from;
}
void splitItem( int item, int pos );
unsigned short *logClustersPtr;
glyph_t *glyphPtr;
advance_t *advancePtr;
qoffset_t *offsetsPtr;
GlyphAttributes *glyphAttributesPtr;
inline unsigned short *logClusters( const QScriptItem *si ) const
{ return logClustersPtr+si->position; }
inline glyph_t *glyphs( const QScriptItem *si ) const
{ return glyphPtr+si->glyph_data_offset; }
inline advance_t *advances( const QScriptItem *si ) const
{ return advancePtr+si->glyph_data_offset; }
inline qoffset_t *offsets( const QScriptItem *si ) const
{ return offsetsPtr+si->glyph_data_offset; }
inline GlyphAttributes *glyphAttributes( const QScriptItem *si ) const
{ return glyphAttributesPtr+si->glyph_data_offset; }
void reallocate( int totalGlyphs );
inline void ensureSpace( int nGlyphs ) const {
if ( num_glyphs - used < nGlyphs )
((QTextEngine *)this)->reallocate( ( (used + nGlyphs + 16) >> 4 ) << 4 );
}
int allocated;
void **memory;
int num_glyphs;
int used;
};
#endif
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