Inheritance diagram for QGLGradientCache:

Classes
struct	CacheInfo

Public Slots
void	cleanupGLContextRefs (const QGLContext *context)

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

Public Functions
GLuint	getBuffer (const QGradient &gradient, qreal opacity, QGLContext *ctx)

int	paletteSize () const

	QGLGradientCache ()

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...

Protected Functions
GLuint	addCacheElement (quint64 hash_val, const QGradient &gradient, qreal opacity)

void	cleanCache ()

void	generateGradientColorTable (const QGradient &g, uint *colorTable, int size, qreal opacity) const

int	maxCacheSize () const

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...

Protected Variables
QGLContext *	buffer_ctx

QGLGradientColorTableHash	cache

Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Private Types
typedef QMultiHash< quint64, CacheInfo >	QGLGradientColorTableHash

Additional Inherited Members
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 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)

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

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 994 of file qpaintengine_opengl.cpp.

Typedefs

◆ QGLGradientColorTableHash

typedef QMultiHash<quint64, CacheInfo> QGLGradientCache::QGLGradientColorTableHash

private

Definition at line 1008 of file qpaintengine_opengl.cpp.

Constructors and Destructors

◆ QGLGradientCache()

QGLGradientCache::QGLGradientCache ( )

inline

Definition at line 1011 of file qpaintengine_opengl.cpp.

                        : QObject(), buffer_ctx(0)
     {
         connect(QGLSignalProxy::instance(),
                 SIGNAL(aboutToDestroyContext(const QGLContext*)),
                 SLOT(cleanupGLContextRefs(const QGLContext*)));
     }

Functions

◆ addCacheElement()

GLuint QGLGradientCache::addCacheElement	(	quint64	hash_val,
		const QGradient &	gradient,
		qreal	opacity
	)

inlineprotected

Definition at line 1054 of file qpaintengine_opengl.cpp.

                                                                                        {
         if (cache.size() == maxCacheSize()) {
             int elem_to_remove = qrand() % maxCacheSize();
             quint64 key = cache.keys()[elem_to_remove];
 
             // need to call glDeleteTextures on each removed cache entry:
             QGLGradientColorTableHash::const_iterator it = cache.constFind(key);
             do {
                 glDeleteTextures(1, &it.value().texId);
             } while (++it != cache.constEnd() && it.key() == key);
             cache.remove(key); // may remove more than 1, but OK
         }
         CacheInfo cache_entry(gradient.stops(), opacity, gradient.interpolationMode());
         uint buffer[1024];
         generateGradientColorTable(gradient, buffer, paletteSize(), opacity);
         glGenTextures(1, &cache_entry.texId);
 #ifndef QT_OPENGL_ES
         glBindTexture(GL_TEXTURE_1D, cache_entry.texId);
         glTexImage1D(GL_TEXTURE_1D, 0, GL_RGBA, paletteSize(),
                      0, GL_BGRA, GL_UNSIGNED_BYTE, buffer);
 #else
         // create 2D one-line texture instead. This requires an impl of manual GL_TEXGEN for all primitives
 #endif
         return cache.insert(hash_val, cache_entry).value().texId;
     }

◆ cleanCache()

void QGLGradientCache::cleanCache ( )

inlineprotected

Definition at line 1080 of file qpaintengine_opengl.cpp.

                       {
         QGLShareContextScope scope(buffer_ctx);
         QGLGradientColorTableHash::const_iterator it = cache.constBegin();
         for (; it != cache.constEnd(); ++it) {
             const CacheInfo &cache_info = it.value();
             glDeleteTextures(1, &cache_info.texId);
         }
         cache.clear();
     }

◆ cleanupGLContextRefs

void QGLGradientCache::cleanupGLContextRefs ( const QGLContext * context )

inlineslot

Definition at line 1095 of file qpaintengine_opengl.cpp.

                                                          {
         if (context == buffer_ctx) {
             cleanCache();
             buffer_ctx = 0;
         }
     }

◆ generateGradientColorTable()

void QGLGradientCache::generateGradientColorTable	(	const QGradient &	g,
		uint *	colorTable,
		int	size,
		qreal	opacity
	)		const

inlineprotected

Definition at line 1115 of file qpaintengine_opengl.cpp.

 {
     int pos = 0;
     QGradientStops s = gradient.stops();
     QVector<uint> colors(s.size());
 
     for (int i = 0; i < s.size(); ++i)
         colors[i] = s[i].second.rgba();
 
     bool colorInterpolation = (gradient.interpolationMode() == QGradient::ColorInterpolation);
 
     uint alpha = qRound(opacity * 256);
     uint current_color = ARGB_COMBINE_ALPHA(colors[0], alpha);
     qreal incr = 1.0 / qreal(size);
     qreal fpos = 1.5 * incr;
     colorTable[pos++] = endianColor(PREMUL(current_color));
 
     while (fpos <= s.first().first) {
         colorTable[pos] = colorTable[pos - 1];
         pos++;
         fpos += incr;
     }
 
     if (colorInterpolation)
         current_color = PREMUL(current_color);
 
     for (int i = 0; i < s.size() - 1; ++i) {
         qreal delta = 1/(s[i+1].first - s[i].first);
         uint next_color = ARGB_COMBINE_ALPHA(colors[i+1], alpha);
         if (colorInterpolation)
             next_color = PREMUL(next_color);
 
         while (fpos < s[i+1].first && pos < size) {
             int dist = int(256 * ((fpos - s[i].first) * delta));
             int idist = 256 - dist;
             if (colorInterpolation)
                 colorTable[pos] = endianColor(INTERPOLATE_PIXEL_256(current_color, idist, next_color, dist));
             else
                 colorTable[pos] = endianColor(PREMUL(INTERPOLATE_PIXEL_256(current_color, idist, next_color, dist)));
             ++pos;
             fpos += incr;
         }
         current_color = next_color;
     }
 
     Q_ASSERT(s.size() > 0);
 
     uint last_color = endianColor(PREMUL(ARGB_COMBINE_ALPHA(colors[s.size() - 1], alpha)));
     for (;pos < size; ++pos)
         colorTable[pos] = last_color;
 
     // Make sure the last color stop is represented at the end of the table
     colorTable[size-1] = last_color;
 }

◆ getBuffer()

GLuint QGLGradientCache::getBuffer	(	const QGradient &	gradient,
		qreal	opacity,
		QGLContext *	ctx
	)

inline

Definition at line 1018 of file qpaintengine_opengl.cpp.

                                                                                        {
         if (buffer_ctx && !QGLContext::areSharing(buffer_ctx, ctx))
             cleanCache();
 
         buffer_ctx = ctx;
 
         quint64 hash_val = 0;
 
         QGradientStops stops = gradient.stops();
         for (int i = 0; i < stops.size() && i <= 2; i++)
             hash_val += stops[i].second.rgba();
 
         QGLGradientColorTableHash::const_iterator it = cache.constFind(hash_val);
 
         if (it == cache.constEnd())
             return addCacheElement(hash_val, gradient, opacity);
         else {
             do {
                 const CacheInfo &cache_info = it.value();
                 if (cache_info.stops == stops && cache_info.opacity == opacity && cache_info.interpolationMode == gradient.interpolationMode()) {
                     return cache_info.texId;
                 }
                 ++it;
             } while (it != cache.constEnd() && it.key() == hash_val);
             // an exact match for these stops and opacity was not found, create new cache
             return addCacheElement(hash_val, gradient, opacity);
         }
     }

◆ maxCacheSize()

int QGLGradientCache::maxCacheSize ( ) const

inlineprotected

Definition at line 1050 of file qpaintengine_opengl.cpp.

1050 { return 60; }

◆ paletteSize()

int QGLGradientCache::paletteSize ( ) const

inline

Definition at line 1047 of file qpaintengine_opengl.cpp.

1047 { return 1024; }

Properties

◆ buffer_ctx

QGLContext* QGLGradientCache::buffer_ctx

protected

Definition at line 1092 of file qpaintengine_opengl.cpp.

◆ cache

QGLGradientColorTableHash QGLGradientCache::cache

protected

Definition at line 1090 of file qpaintengine_opengl.cpp.

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

/src/opengl/qpaintengine_opengl.cpp

Classes

Public Slots

Public Functions

Protected Functions

Protected Variables

Private Types

Additional Inherited Members

Detailed Description

Typedefs

◆ QGLGradientColorTableHash

Constructors and Destructors

◆ QGLGradientCache()

Functions

◆ addCacheElement()

◆ cleanCache()

◆ cleanupGLContextRefs

◆ generateGradientColorTable()

◆ getBuffer()

◆ maxCacheSize()

◆ paletteSize()

Properties

◆ buffer_ctx

◆ cache