#include <qfontenginedirectwrite_p.h>

Inheritance diagram for QFontEngineDirectWrite:

Public Functions
void	addGlyphsToPath (glyph_t glyphs, QFixedPoint positions, int nglyphs, QPainterPath *path, QTextItem::RenderFlags flags)

glyph_metrics_t	alphaMapBoundingBox (glyph_t glyph, QFixed subPixelPosition, const QTransform &matrix, GlyphFormat format)

QImage	alphaMapForGlyph (glyph_t, QFixed subPixelPosition, const QTransform &t)

QImage	alphaRGBMapForGlyph (glyph_t t, QFixed subPixelPosition, int margin, const QTransform &xform)

QFixed	ascent () const

glyph_metrics_t	boundingBox (const QGlyphLayout &glyphs)

glyph_metrics_t	boundingBox (glyph_t g)

bool	canRender (const QChar *string, int len)

QFontEngine *	cloneWithSize (qreal pixelSize) const

QFixed	descent () const

QFixed	emSquareSize () const

bool	getSfntTableData (uint tag, uchar buffer, uint length) const

QFixed	leading () const

QFixed	lineThickness () const

qreal	maxCharWidth () const

const char *	name () const

	QFontEngineDirectWrite (IDWriteFactory directWriteFactory, IDWriteFontFace directWriteFontFace, qreal pixelSize)

void	recalcAdvances (QGlyphLayout *glyphs, QTextEngine::ShaperFlags) const

bool	stringToCMap (const QChar str, int len, QGlyphLayout glyphs, int *nglyphs, QTextEngine::ShaperFlags flags) const

bool	supportsSubPixelPositions () const

Type	type () const

QFixed	xHeight () const

	~QFontEngineDirectWrite ()

Public Functions inherited from QFontEngine
void	addBitmapFontToPath (qreal x, qreal y, const QGlyphLayout &, QPainterPath *, QTextItem::RenderFlags)

virtual void	addOutlineToPath (qreal, qreal, const QGlyphLayout &, QPainterPath *, QTextItem::RenderFlags flags)

virtual QImage	alphaMapForGlyph (glyph_t)

virtual QImage	alphaMapForGlyph (glyph_t glyph, QFixed subPixelPosition)

virtual QImage	alphaMapForGlyph (glyph_t, const QTransform &t)

virtual QFixed	averageCharWidth () const

virtual glyph_metrics_t	boundingBox (glyph_t glyph, const QTransform &matrix)

virtual void	doKerning (QGlyphLayout *, QTextEngine::ShaperFlags) const

virtual FaceId	faceId () const

virtual void	getGlyphBearings (glyph_t glyph, qreal leftBearing=0, qreal rightBearing=0)

void	getGlyphPositions (const QGlyphLayout &glyphs, const QTransform &matrix, QTextItem::RenderFlags flags, QVarLengthArray< glyph_t > &glyphs_out, QVarLengthArray< QFixedPoint > &positions)

virtual HB_Error	getPointInOutline (HB_Glyph glyph, int flags, hb_uint32 point, HB_Fixed xpos, HB_Fixed ypos, hb_uint32 *nPoints)

QByteArray	getSfntTable (uint) const

virtual void	getUnscaledGlyph (glyph_t glyph, QPainterPath path, glyph_metrics_t metrics)

QFontEngineGlyphCache *	glyphCache (void *key, QFontEngineGlyphCache::Type type, const QTransform &transform) const

virtual int	glyphCount () const

HB_Face	harfbuzzFace () const

HB_Font	harfbuzzFont () const

void	loadKerningPairs (QFixed scalingFactor)

virtual qreal	minLeftBearing () const

virtual qreal	minRightBearing () const

virtual Properties	properties () const

	QFontEngine ()

virtual void	removeGlyphFromCache (glyph_t)

void	setGlyphCache (void key, QFontEngineGlyphCache data)

virtual int	synthesized () const

glyph_metrics_t	tightBoundingBox (const QGlyphLayout &glyphs)

virtual QFixed	underlinePosition () const

virtual	~QFontEngine ()

Public Functions inherited from QObject
bool	blockSignals (bool b)
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More...

const QObjectList &	children () const
	Returns a list of child objects. More...

bool	connect (const QObject sender, const char signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const

bool	disconnect (const char signal=0, const QObject receiver=0, const char *member=0)

bool	disconnect (const QObject receiver, const char member=0)

void	dumpObjectInfo ()
	Dumps information about signal connections, etc. More...

void	dumpObjectTree ()
	Dumps a tree of children to the debug output. More...

QList< QByteArray >	dynamicPropertyNames () const
	Returns the names of all properties that were dynamically added to the object using setProperty(). More...

virtual bool	event (QEvent *)
	This virtual function receives events to an object and should return true if the event e was recognized and processed. More...

virtual bool	eventFilter (QObject , QEvent )
	Filters events if this object has been installed as an event filter for the watched object. More...

template<typename T >
T	findChild (const QString &aName=QString()) const
	Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More...

template<typename T >
QList< T >	findChildren (const QString &aName=QString()) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. More...

template<typename T >
QList< T >	findChildren (const QRegExp &re) const

bool	inherits (const char *classname) const
	Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. More...

void	installEventFilter (QObject *)
	Installs an event filter filterObj on this object. More...

bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false. More...

void	killTimer (int id)
	Kills the timer with timer identifier, id. More...

virtual const QMetaObject *	metaObject () const
	Returns a pointer to the meta-object of this object. More...

void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children. More...

QString	objectName () const

QObject *	parent () const
	Returns a pointer to the parent object. More...

QVariant	property (const char *name) const
	Returns the value of the object's name property. More...

Q_INVOKABLE	QObject (QObject *parent=0)
	Constructs an object with parent object parent. More...

void	removeEventFilter (QObject *)
	Removes an event filter object obj from this object. More...

void	setObjectName (const QString &name)

void	setParent (QObject *)
	Makes the object a child of parent. More...

bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value. More...

void	setUserData (uint id, QObjectUserData *data)

bool	signalsBlocked () const
	Returns true if signals are blocked; otherwise returns false. More...

int	startTimer (int interval)
	Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More...

QThread *	thread () const
	Returns the thread in which the object lives. More...

QObjectUserData *	userData (uint id) const

virtual	~QObject ()
	Destroys the object, deleting all its child objects. More...

Private Functions
void	collectMetrics ()

QImage	imageForGlyph (glyph_t t, QFixed subPixelPosition, int margin, const QTransform &xform)

Properties
QFixed	m_ascent

QFixed	m_descent

IDWriteBitmapRenderTarget *	m_directWriteBitmapRenderTarget

IDWriteFactory *	m_directWriteFactory

IDWriteFontFace *	m_directWriteFontFace

FaceId	m_faceId

QFixed	m_lineGap

QFixed	m_lineThickness

int	m_unitsPerEm

QFixed	m_xHeight

Friends
class	QRawFontPrivate

Additional Inherited Members
Public Types inherited from QFontEngine
enum	GlyphFormat { Format_None, Format_Render = Format_None, Format_Mono, Format_A8, Format_A32 }

enum	SynthesizedFlags { SynthesizedItalic = 0x1, SynthesizedBold = 0x2, SynthesizedStretch = 0x4 }

enum	Type { Box, Multi, XLFD, Win, Mac, Freetype, QPF1, QPF2, Proxy, S60FontEngine, DirectWrite, TestFontEngine = 0x1000 }

Public Slots inherited from QObject
void	deleteLater ()
	Schedules this object for deletion. More...

Signals inherited from QObject
void	destroyed (QObject *=0)
	This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More...

Static Public Functions inherited from QFontEngine
static QByteArray	convertToPostscriptFontFamilyName (const QByteArray &fontFamily)

static const uchar *	getCMap (const uchar table, uint tableSize, bool isSymbolFont, int *cmapSize)

static quint32	getTrueTypeGlyphIndex (const uchar *cmap, uint unicode)

Static Public Functions inherited from QObject
static bool	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More...

static bool	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)

static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	Disconnects signal in object sender from method in object receiver. More...

static bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &member)

static uint	registerUserData ()

static QString	tr (const char sourceText, const char comment=0, int n=-1)

static QString	trUtf8 (const char sourceText, const char comment=0, int n=-1)

Public Variables inherited from QFontEngine
uint	cache_cost

int	cache_count

QFontDef	fontDef

uint	fsType: 16

int	glyphFormat

HB_Face	hbFace

HB_FontRec	hbFont

QVector< KernPair >	kerning_pairs

QAtomicInt	ref

bool	symbol

Static Public Variables inherited from QObject
static const QMetaObject	staticMetaObject
	This variable stores the meta-object for the class. More...

Protected Functions inherited from QFontEngine
QFixed	lastRightBearing (const QGlyphLayout &glyphs, bool round=false)

Protected Functions inherited from QObject
virtual void	childEvent (QChildEvent *)
	This event handler can be reimplemented in a subclass to receive child events. More...

virtual void	connectNotify (const char *signal)
	This virtual function is called when something has been connected to signal in this object. More...

virtual void	customEvent (QEvent *)
	This event handler can be reimplemented in a subclass to receive custom events. More...

virtual void	disconnectNotify (const char *signal)
	This virtual function is called when something has been disconnected from signal in this object. More...

	QObject (QObjectPrivate &dd, QObject *parent=0)

int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal. More...

QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. More...

int	senderSignalIndex () const

virtual void	timerEvent (QTimerEvent *)
	This event handler can be reimplemented in a subclass to receive timer events for the object. More...

Static Protected Functions inherited from QFontEngine
static const QVector< QRgb > &	grayPalette ()

Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Static Protected Variables inherited from QObject
static const QMetaObject	staticQtMetaObject

Related Functions inherited from QObject
T	qFindChildqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QRegExp &regExp)()

T *	qobject_cast (QObject *object)

	QObjectList

void *	qt_find_obj_child (QObject parent, const char type, const QString &name)
	Returns a pointer to the object named name that inherits type and with a given parent. More...

Detailed Description

Definition at line 68 of file qfontenginedirectwrite_p.h.

Constructors and Destructors

◆ QFontEngineDirectWrite()

QFontEngineDirectWrite::QFontEngineDirectWrite	(	IDWriteFactory *	directWriteFactory,
		IDWriteFontFace *	directWriteFontFace,
		qreal	pixelSize
	)

explicit

Definition at line 173 of file qfontenginedirectwrite.cpp.

Referenced by cloneWithSize().

     : m_directWriteFontFace(directWriteFontFace)
     , m_directWriteFactory(directWriteFactory)
     , m_directWriteBitmapRenderTarget(0)
     , m_lineThickness(-1)
     , m_unitsPerEm(-1)
     , m_ascent(-1)
     , m_descent(-1)
     , m_xHeight(-1)
     , m_lineGap(-1)
 {
     m_directWriteFactory->AddRef();
     m_directWriteFontFace->AddRef();
 
     fontDef.pixelSize = pixelSize;
     collectMetrics();
 }

◆ ~QFontEngineDirectWrite()

QFontEngineDirectWrite::~QFontEngineDirectWrite ( )

Definition at line 193 of file qfontenginedirectwrite.cpp.

 {
     m_directWriteFactory->Release();
     m_directWriteFontFace->Release();
 
     if (m_directWriteBitmapRenderTarget != 0)
         m_directWriteBitmapRenderTarget->Release();
 }

Functions

◆ addGlyphsToPath()

void QFontEngineDirectWrite::addGlyphsToPath	(	glyph_t *	glyphs,
		QFixedPoint *	positions,
		int	nglyphs,
		QPainterPath *	path,
		QTextItem::RenderFlags	flags
	)

virtual

Reimplemented from QFontEngine.

Definition at line 341 of file qfontenginedirectwrite.cpp.

 {
     if (m_directWriteFontFace == 0)
         return;
 
     QVarLengthArray<UINT16> glyphIndices(nglyphs);
     QVarLengthArray<DWRITE_GLYPH_OFFSET> glyphOffsets(nglyphs);
     QVarLengthArray<FLOAT> glyphAdvances(nglyphs);
 
     for (int i=0; i<nglyphs; ++i) {
         glyphIndices[i] = glyphs[i];
         glyphOffsets[i].advanceOffset  = positions[i].x.toReal();
         glyphOffsets[i].ascenderOffset = -positions[i].y.toReal();
         glyphAdvances[i] = 0.0;
     }
 
     GeometrySink geometrySink(path);
     HRESULT hr = m_directWriteFontFace->GetGlyphRunOutline(
                 fontDef.pixelSize,
                 glyphIndices.data(),
                 glyphAdvances.data(),
                 glyphOffsets.data(),
                 nglyphs,
                 false,
                 flags & QTextItem::RightToLeft,
                 &geometrySink
                 );
 
     if (FAILED(hr))
         qErrnoWarning("QFontEngineDirectWrite::addGlyphsToPath: GetGlyphRunOutline failed");
 }

◆ alphaMapBoundingBox()

glyph_metrics_t QFontEngineDirectWrite::alphaMapBoundingBox	(	glyph_t	glyph,
		QFixed	subPixelPosition,
		const QTransform &	matrix,
		GlyphFormat	format
	)

virtual

Reimplemented from QFontEngine.

Definition at line 390 of file qfontenginedirectwrite.cpp.

 {
     glyph_metrics_t bbox = QFontEngine::boundingBox(glyph, matrix); // To get transformed advance
 
     UINT16 glyphIndex = glyph;
     FLOAT glyphAdvance = 0;
 
     DWRITE_GLYPH_OFFSET glyphOffset;
     glyphOffset.advanceOffset = 0;
     glyphOffset.ascenderOffset = 0;
 
     DWRITE_GLYPH_RUN glyphRun;
     glyphRun.fontFace = m_directWriteFontFace;
     glyphRun.fontEmSize = fontDef.pixelSize;
     glyphRun.glyphCount = 1;
     glyphRun.glyphIndices = &glyphIndex;
     glyphRun.glyphAdvances = &glyphAdvance;
     glyphRun.isSideways = false;
     glyphRun.bidiLevel = 0;
     glyphRun.glyphOffsets = &glyphOffset;
 
     DWRITE_MATRIX transform;
     transform.dx = subPixelPosition.toReal();
     transform.dy = 0;
     transform.m11 = matrix.m11();
     transform.m12 = matrix.m12();
     transform.m21 = matrix.m21();
     transform.m22 = matrix.m22();
 
     IDWriteGlyphRunAnalysis *glyphAnalysis = NULL;
     HRESULT hr = m_directWriteFactory->CreateGlyphRunAnalysis(
                 &glyphRun,
                 1.0f,
                 &transform,
                 DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL_SYMMETRIC,
                 DWRITE_MEASURING_MODE_NATURAL,
                 0.0, 0.0,
                 &glyphAnalysis
                 );
 
     if (SUCCEEDED(hr)) {
         RECT rect;
         glyphAnalysis->GetAlphaTextureBounds(DWRITE_TEXTURE_CLEARTYPE_3x1, &rect);
         glyphAnalysis->Release();
 
         return glyph_metrics_t(rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top,
                                bbox.xoff, bbox.yoff);
     } else {
         return glyph_metrics_t();
     }
 }

◆ alphaMapForGlyph()

QImage QFontEngineDirectWrite::alphaMapForGlyph	(	glyph_t	glyph,
		QFixed	subPixelPosition,
		const QTransform &	t
	)

virtual

Reimplemented from QFontEngine.

Definition at line 513 of file qfontenginedirectwrite.cpp.

 {
     QImage im = imageForGlyph(glyph, subPixelPosition, 0, xform);
 
     QImage indexed(im.width(), im.height(), QImage::Format_Indexed8);
     QVector<QRgb> colors(256);
     for (int i=0; i<256; ++i)
         colors[i] = qRgba(0, 0, 0, i);
     indexed.setColorTable(colors);
 
     for (int y=0; y<im.height(); ++y) {
         uint *src = (uint*) im.scanLine(y);
         uchar *dst = indexed.scanLine(y);
         for (int x=0; x<im.width(); ++x) {
             *dst = 255 - (qt_pow_gamma[qGray(0xffffffff - *src)] * 255. / 2047.);
             ++dst;
             ++src;
         }
     }
 
     return indexed;
 }

◆ alphaRGBMapForGlyph()

QImage QFontEngineDirectWrite::alphaRGBMapForGlyph	(	glyph_t	t,
		QFixed	subPixelPosition,
		int	margin,
		const QTransform &	xform
	)

virtual

Reimplemented from QFontEngine.

Definition at line 640 of file qfontenginedirectwrite.cpp.

 {
     QImage mask = imageForGlyph(t, subPixelPosition, margin, xform);
     return mask.depth() == 32
            ? mask
            : mask.convertToFormat(QImage::Format_RGB32);
 }

◆ ascent()

QFixed QFontEngineDirectWrite::ascent ( ) const

virtual

Implements QFontEngine.

Definition at line 477 of file qfontenginedirectwrite.cpp.

 {
     return fontDef.styleStrategy & QFont::ForceIntegerMetrics
             ? m_ascent.round()
             : m_ascent;
 }

◆ boundingBox() [1/2]

glyph_metrics_t QFontEngineDirectWrite::boundingBox ( const QGlyphLayout & glyphs )

virtual

Implements QFontEngine.

Definition at line 374 of file qfontenginedirectwrite.cpp.

 {
     if (glyphs.numGlyphs == 0)
         return glyph_metrics_t();
 
     bool round = fontDef.styleStrategy & QFont::ForceIntegerMetrics;
 
     QFixed w = 0;
     for (int i = 0; i < glyphs.numGlyphs; ++i) {
         w += round ? glyphs.effectiveAdvance(i).round() : glyphs.effectiveAdvance(i);
 
     }
 
     return glyph_metrics_t(0, -m_ascent, w - lastRightBearing(glyphs), m_ascent + m_descent, w, 0);
 }

◆ boundingBox() [2/2]

glyph_metrics_t QFontEngineDirectWrite::boundingBox ( glyph_t g )

virtual

Implements QFontEngine.

Definition at line 444 of file qfontenginedirectwrite.cpp.

 {
     if (m_directWriteFontFace == 0)
         return glyph_metrics_t();
 
     UINT16 glyphIndex = g;
 
     DWRITE_GLYPH_METRICS glyphMetrics;
     HRESULT hr = m_directWriteFontFace->GetDesignGlyphMetrics(&glyphIndex, 1, &glyphMetrics);
     if (SUCCEEDED(hr)) {
         QFixed advanceWidth = DESIGN_TO_LOGICAL(glyphMetrics.advanceWidth);
         QFixed leftSideBearing = DESIGN_TO_LOGICAL(glyphMetrics.leftSideBearing);
         QFixed rightSideBearing = DESIGN_TO_LOGICAL(glyphMetrics.rightSideBearing);
         QFixed advanceHeight = DESIGN_TO_LOGICAL(glyphMetrics.advanceHeight);
         QFixed verticalOriginY = DESIGN_TO_LOGICAL(glyphMetrics.verticalOriginY);
 
         if (fontDef.styleStrategy & QFont::ForceIntegerMetrics) {
             advanceWidth = advanceWidth.round();
             advanceHeight = advanceHeight.round();
         }
 
         QFixed width = advanceWidth - leftSideBearing - rightSideBearing;
 
         return glyph_metrics_t(-leftSideBearing, -verticalOriginY,
                                width, m_ascent + m_descent,
                                advanceWidth, advanceHeight);
     } else {
         qErrnoWarning("QFontEngineDirectWrite::boundingBox: GetDesignGlyphMetrics failed");
     }
 
     return glyph_metrics_t();
 }

◆ canRender()

bool QFontEngineDirectWrite::canRender	(	const QChar *	string,
		int	len
	)

virtual

Implements QFontEngine.

Definition at line 656 of file qfontenginedirectwrite.cpp.

 {
     QVarLengthArray<UINT32> codePoints(len);
     int actualLength = 0;
     for (int i=0; i<len; ++i, actualLength++)
         codePoints[actualLength] = getChar(string, i, len);
 
     QVarLengthArray<UINT16> glyphIndices(actualLength);
     HRESULT hr = m_directWriteFontFace->GetGlyphIndices(codePoints.data(), actualLength,
                                                         glyphIndices.data());
     if (FAILED(hr)) {
         qErrnoWarning(hr, "QFontEngineDirectWrite::canRender: GetGlyphIndices failed");
         return false;
     } else {
         for (int i=0; i<glyphIndices.size(); ++i) {
             if (glyphIndices.at(i) == 0)
                 return false;
         }
 
         return true;
     }
 }

◆ cloneWithSize()

QFontEngine * QFontEngineDirectWrite::cloneWithSize ( qreal pixelSize ) const

virtual

Reimplemented from QFontEngine.

Definition at line 684 of file qfontenginedirectwrite.cpp.

 {
     QFontEngine *fontEngine = new QFontEngineDirectWrite(m_directWriteFactory, m_directWriteFontFace,
                                                          pixelSize);
 
     fontEngine->fontDef = fontDef;
     fontEngine->fontDef.pixelSize = pixelSize;
 
     return fontEngine;
 }

◆ collectMetrics()

void QFontEngineDirectWrite::collectMetrics ( )

private

Definition at line 202 of file qfontenginedirectwrite.cpp.

Referenced by QFontEngineDirectWrite().

 {
     if (m_directWriteFontFace != 0) {
         DWRITE_FONT_METRICS metrics;
 
         m_directWriteFontFace->GetMetrics(&metrics);
         m_unitsPerEm = metrics.designUnitsPerEm;
 
         m_lineThickness = DESIGN_TO_LOGICAL(metrics.underlineThickness);
         m_ascent = DESIGN_TO_LOGICAL(metrics.ascent);
         m_descent = DESIGN_TO_LOGICAL(metrics.descent);
         m_xHeight = DESIGN_TO_LOGICAL(metrics.xHeight);
         m_lineGap = DESIGN_TO_LOGICAL(metrics.lineGap);
     }
 }

◆ descent()

QFixed QFontEngineDirectWrite::descent ( ) const

virtual

Implements QFontEngine.

Definition at line 484 of file qfontenginedirectwrite.cpp.

 {
     return fontDef.styleStrategy & QFont::ForceIntegerMetrics
            ? (m_descent - 1).round()
            : (m_descent - 1);
 }

◆ emSquareSize()

QFixed QFontEngineDirectWrite::emSquareSize ( ) const

virtual

Reimplemented from QFontEngine.

Definition at line 262 of file qfontenginedirectwrite.cpp.

 {
     if (m_unitsPerEm > 0)
         return m_unitsPerEm;
     else
         return QFontEngine::emSquareSize();
 }

◆ getSfntTableData()

bool QFontEngineDirectWrite::getSfntTableData	(	uint	tag,
		uchar *	buffer,
		uint *	length
	)		const

virtual

Reimplemented from QFontEngine.

Definition at line 226 of file qfontenginedirectwrite.cpp.

 {
     if (m_directWriteFontFace) {
         DWORD t = qbswap<quint32>(tag);
 
         const void *tableData = 0;
         void *tableContext = 0;
         UINT32 tableSize;
         BOOL exists;
         HRESULT hr = m_directWriteFontFace->TryGetFontTable(
                     t, &tableData, &tableSize, &tableContext, &exists
                     );
 
         if (SUCCEEDED(hr)) {
             if (!exists)
                 return false;
 
             if (buffer == 0) {
                 *length = tableSize;
                 return true;
             } else if (*length < tableSize) {
                 return false;
             }
 
             qMemCopy(buffer, tableData, tableSize);
             m_directWriteFontFace->ReleaseFontTable(tableContext);
 
             return true;
         } else {
             qErrnoWarning("QFontEngineDirectWrite::getSfntTableData: TryGetFontTable failed");
         }
     }
 
     return false;
 }

◆ imageForGlyph()

QImage QFontEngineDirectWrite::imageForGlyph	(	glyph_t	t,
		QFixed	subPixelPosition,
		int	margin,
		const QTransform &	xform
	)

private

Definition at line 542 of file qfontenginedirectwrite.cpp.

Referenced by alphaMapForGlyph(), and alphaRGBMapForGlyph().

 {
     UINT16 glyphIndex = t;
     FLOAT glyphAdvance = 0;
 
     DWRITE_GLYPH_OFFSET glyphOffset;
     glyphOffset.advanceOffset = 0;
     glyphOffset.ascenderOffset = 0;
 
     DWRITE_GLYPH_RUN glyphRun;
     glyphRun.fontFace = m_directWriteFontFace;
     glyphRun.fontEmSize = fontDef.pixelSize;
     glyphRun.glyphCount = 1;
     glyphRun.glyphIndices = &glyphIndex;
     glyphRun.glyphAdvances = &glyphAdvance;
     glyphRun.isSideways = false;
     glyphRun.bidiLevel = 0;
     glyphRun.glyphOffsets = &glyphOffset;
 
     DWRITE_MATRIX transform;
     transform.dx = subPixelPosition.toReal();
     transform.dy = 0;
     transform.m11 = xform.m11();
     transform.m12 = xform.m12();
     transform.m21 = xform.m21();
     transform.m22 = xform.m22();
 
     IDWriteGlyphRunAnalysis *glyphAnalysis = NULL;
     HRESULT hr = m_directWriteFactory->CreateGlyphRunAnalysis(
                 &glyphRun,
                 1.0f,
                 &transform,
                 DWRITE_RENDERING_MODE_CLEARTYPE_NATURAL_SYMMETRIC,
                 DWRITE_MEASURING_MODE_NATURAL,
                 0.0, 0.0,
                 &glyphAnalysis
                 );
 
     if (SUCCEEDED(hr)) {
         RECT rect;
         glyphAnalysis->GetAlphaTextureBounds(DWRITE_TEXTURE_CLEARTYPE_3x1, &rect);
 
         rect.left -= margin;
         rect.top -= margin;
         rect.right += margin;
         rect.bottom += margin;
 
         int width = rect.right - rect.left;
         int height = rect.bottom - rect.top;
 
         int size = width * height * 3;
         if (size > 0) {
             BYTE *alphaValues = new BYTE[size];
             qMemSet(alphaValues, size, 0);
 
             hr = glyphAnalysis->CreateAlphaTexture(DWRITE_TEXTURE_CLEARTYPE_3x1,
                                                    &rect,
                                                    alphaValues,
                                                    size);
 
             if (SUCCEEDED(hr)) {
                 QImage img(width, height, QImage::Format_RGB32);
                 img.fill(0xffffffff);
 
                 for (int y=0; y<height; ++y) {
                     uint *dest = reinterpret_cast<uint *>(img.scanLine(y));
                     BYTE *src = alphaValues + width * 3 * y;
 
                     for (int x=0; x<width; ++x) {
                         dest[x] = *(src) << 16
                                 | *(src + 1) << 8
                                 | *(src + 2);
 
                         src += 3;
                     }
                 }
 
                 delete[] alphaValues;
                 glyphAnalysis->Release();
 
                 return img;
             } else {
                 delete[] alphaValues;
                 glyphAnalysis->Release();
 
                 qErrnoWarning("QFontEngineDirectWrite::imageForGlyph: CreateAlphaTexture failed");
             }
         }
     } else {
         qErrnoWarning("QFontEngineDirectWrite::imageForGlyph: CreateGlyphRunAnalysis failed");
     }
 
     return QImage();
 }

◆ leading()

QFixed QFontEngineDirectWrite::leading ( ) const

virtual

Implements QFontEngine.

Definition at line 491 of file qfontenginedirectwrite.cpp.

 {
     return fontDef.styleStrategy & QFont::ForceIntegerMetrics
            ? m_lineGap.round()
            : m_lineGap;
 }

◆ lineThickness()

QFixed QFontEngineDirectWrite::lineThickness ( ) const

virtual

Reimplemented from QFontEngine.

Definition at line 218 of file qfontenginedirectwrite.cpp.

 {
     if (m_lineThickness > 0)
         return m_lineThickness;
     else
         return QFontEngine::lineThickness();
 }

◆ maxCharWidth()

qreal QFontEngineDirectWrite::maxCharWidth ( ) const

virtual

Implements QFontEngine.

Definition at line 505 of file qfontenginedirectwrite.cpp.

 {
     // ###
     return 0;
 }

◆ name()

const char * QFontEngineDirectWrite::name ( ) const

virtual

Implements QFontEngine.

Definition at line 651 of file qfontenginedirectwrite.cpp.

 {
     return 0;
 }

◆ recalcAdvances()

void QFontEngineDirectWrite::recalcAdvances	(	QGlyphLayout *	,
		QTextEngine::ShaperFlags
	)		const

virtual

This is a callback from harfbuzz. The font engine uses the font-system in use to find out the advances of each glyph and set it on the layout.

Reimplemented from QFontEngine.

Definition at line 314 of file qfontenginedirectwrite.cpp.

Referenced by stringToCMap().

 {
     if (m_directWriteFontFace == 0)
         return;
 
     QVarLengthArray<UINT16> glyphIndices(glyphs->numGlyphs);
 
     // ### Caching?
     for(int i=0; i<glyphs->numGlyphs; i++)
         glyphIndices[i] = UINT16(glyphs->glyphs[i]);
 
     QVarLengthArray<DWRITE_GLYPH_METRICS> glyphMetrics(glyphIndices.size());
     HRESULT hr = m_directWriteFontFace->GetDesignGlyphMetrics(glyphIndices.data(),
                                                               glyphIndices.size(),
                                                               glyphMetrics.data());
     if (SUCCEEDED(hr)) {
         for (int i=0; i<glyphs->numGlyphs; ++i) {
             glyphs->advances_x[i] = DESIGN_TO_LOGICAL(glyphMetrics[i].advanceWidth);
             if (fontDef.styleStrategy & QFont::ForceIntegerMetrics)
                 glyphs->advances_x[i] = glyphs->advances_x[i].round();
             glyphs->advances_y[i] = 0;
         }
     } else {
         qErrnoWarning("QFontEngineDirectWrite::recalcAdvances: GetDesignGlyphMetrics failed");
     }
 }

◆ stringToCMap()

bool QFontEngineDirectWrite::stringToCMap	(	const QChar *	str,
		int	len,
		QGlyphLayout *	glyphs,
		int *	nglyphs,
		QTextEngine::ShaperFlags	flags
	)		const

virtual

Implements QFontEngine.

Definition at line 280 of file qfontenginedirectwrite.cpp.

 {
     if (m_directWriteFontFace != 0) {
         QVarLengthArray<UINT32> codePoints(len);
         for (int i=0; i<len; ++i) {
             codePoints[i] = getChar(str, i, len);
             if (flags & QTextEngine::RightToLeft)
                 codePoints[i] = QChar::mirroredChar(codePoints[i]);
         }
 
         QVarLengthArray<UINT16> glyphIndices(len);
         HRESULT hr = m_directWriteFontFace->GetGlyphIndicesW(codePoints.data(),
                                                              len,
                                                              glyphIndices.data());
 
         if (SUCCEEDED(hr)) {
             for (int i=0; i<len; ++i)
                 glyphs->glyphs[i] = glyphIndices[i];
 
             *nglyphs = len;
 
             if (!(flags & QTextEngine::GlyphIndicesOnly))
                 recalcAdvances(glyphs, 0);
 
             return true;
         } else {
             qErrnoWarning("QFontEngineDirectWrite::stringToCMap: GetGlyphIndicesW failed");
         }
     }
 
     return false;
 }

◆ supportsSubPixelPositions()

bool QFontEngineDirectWrite::supportsSubPixelPositions ( ) const

virtual

Reimplemented from QFontEngine.

Definition at line 537 of file qfontenginedirectwrite.cpp.

 {
     return true;
 }

◆ type()

QFontEngine::Type QFontEngineDirectWrite::type ( ) const

virtual

Implements QFontEngine.

Definition at line 679 of file qfontenginedirectwrite.cpp.

 {
     return QFontEngine::DirectWrite;
 }

◆ xHeight()

QFixed QFontEngineDirectWrite::xHeight ( ) const

virtual

Reimplemented from QFontEngine.

Definition at line 498 of file qfontenginedirectwrite.cpp.

 {
     return fontDef.styleStrategy & QFont::ForceIntegerMetrics
            ? m_xHeight.round()
            : m_xHeight;
 }

Friends and Related Functions

◆ QRawFontPrivate

friend class QRawFontPrivate

friend

Definition at line 114 of file qfontenginedirectwrite_p.h.

Properties

◆ m_ascent

QFixed QFontEngineDirectWrite::m_ascent

private

Definition at line 125 of file qfontenginedirectwrite_p.h.

Referenced by ascent(), boundingBox(), and collectMetrics().

◆ m_descent

QFixed QFontEngineDirectWrite::m_descent

private

Definition at line 126 of file qfontenginedirectwrite_p.h.

Referenced by boundingBox(), collectMetrics(), and descent().

◆ m_directWriteBitmapRenderTarget

IDWriteBitmapRenderTarget* QFontEngineDirectWrite::m_directWriteBitmapRenderTarget

private

Definition at line 121 of file qfontenginedirectwrite_p.h.

Referenced by ~QFontEngineDirectWrite().

◆ m_directWriteFactory

IDWriteFactory* QFontEngineDirectWrite::m_directWriteFactory

private

Definition at line 120 of file qfontenginedirectwrite_p.h.

Referenced by alphaMapBoundingBox(), cloneWithSize(), imageForGlyph(), QFontEngineDirectWrite(), and ~QFontEngineDirectWrite().

◆ m_directWriteFontFace

IDWriteFontFace* QFontEngineDirectWrite::m_directWriteFontFace

private

Definition at line 119 of file qfontenginedirectwrite_p.h.

Referenced by addGlyphsToPath(), alphaMapBoundingBox(), boundingBox(), canRender(), cloneWithSize(), collectMetrics(), getSfntTableData(), imageForGlyph(), QFontEngineDirectWrite(), recalcAdvances(), stringToCMap(), and ~QFontEngineDirectWrite().

◆ m_faceId

FaceId QFontEngineDirectWrite::m_faceId

private

Definition at line 129 of file qfontenginedirectwrite_p.h.

◆ m_lineGap

QFixed QFontEngineDirectWrite::m_lineGap

private

Definition at line 128 of file qfontenginedirectwrite_p.h.

Referenced by collectMetrics(), and leading().

◆ m_lineThickness

QFixed QFontEngineDirectWrite::m_lineThickness

private

Definition at line 123 of file qfontenginedirectwrite_p.h.

Referenced by collectMetrics(), and lineThickness().

◆ m_unitsPerEm

int QFontEngineDirectWrite::m_unitsPerEm

private

Definition at line 124 of file qfontenginedirectwrite_p.h.

Referenced by collectMetrics(), and emSquareSize().

◆ m_xHeight

QFixed QFontEngineDirectWrite::m_xHeight

private

Definition at line 127 of file qfontenginedirectwrite_p.h.

Referenced by collectMetrics(), and xHeight().

The documentation for this class was generated from the following files:

/src/gui/text/qfontenginedirectwrite_p.h
/src/gui/text/qfontenginedirectwrite.cpp

Public Functions

Private Functions

Properties

Friends

Additional Inherited Members

Detailed Description

Constructors and Destructors

◆ QFontEngineDirectWrite()

◆ ~QFontEngineDirectWrite()

Functions

◆ addGlyphsToPath()

◆ alphaMapBoundingBox()

◆ alphaMapForGlyph()

◆ alphaRGBMapForGlyph()

◆ ascent()

◆ boundingBox() [1/2]

◆ boundingBox() [2/2]

◆ canRender()

◆ cloneWithSize()

◆ collectMetrics()

◆ descent()

◆ emSquareSize()

◆ getSfntTableData()

◆ imageForGlyph()

◆ leading()

◆ lineThickness()

◆ maxCharWidth()

◆ name()

◆ recalcAdvances()

◆ stringToCMap()

◆ supportsSubPixelPositions()

◆ type()

◆ xHeight()

Friends and Related Functions

◆ QRawFontPrivate

Properties

◆ m_ascent

◆ m_descent

◆ m_directWriteBitmapRenderTarget

◆ m_directWriteFactory

◆ m_directWriteFontFace

◆ m_faceId

◆ m_lineGap

◆ m_lineThickness

◆ m_unitsPerEm

◆ m_xHeight