QGLWindowSurface Class Reference

#include <qwindowsurface_gl_p.h>

Inheritance diagram for QGLWindowSurface:

Public Types
enum	SwapMode { AutomaticSwap, AlwaysFullSwap, AlwaysPartialSwap, KillSwap }
Public Types inherited from QWindowSurface
enum	WindowSurfaceFeature { PartialUpdates = 0x00000001, PreservedContents = 0x00000002, StaticContents = 0x00000004, AllFeatures = 0xffffffff }

Public Functions
void	beginPaint (const QRegion &region)
	This function is called before painting onto the surface begins, with the region in which the painting will occur. More...
QImage *	buffer (const QWidget *widget)
	Returns a QImage pointer which represents the actual buffer the widget is drawn into or 0 if this is unavailable. More...
QGLContext *	context () const
void	endPaint (const QRegion &region)
	This function is called after painting onto the surface has ended, with the region in which the painting was performed. More...
WindowSurfaceFeatures	features () const
void	flush (QWidget *widget, const QRegion &region, const QPoint &offset)
	Flushes the given region from the specified widget onto the screen. More...
QPaintDevice *	paintDevice ()
	Implement this function to return the appropriate paint device. More...
	QGLWindowSurface (QWidget *window)
bool	scroll (const QRegion &area, int dx, int dy)
	Scrolls the given area dx pixels to the right and dy downward; both dx and dy may be negative. More...
void	setGeometry (const QRect &rect)
	Sets the currently allocated area to be the given rect. More...
void	updateGeometry ()
	~QGLWindowSurface ()
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...
Public Functions inherited from QWindowSurface
QRect	geometry () const
	Returns the currently allocated area on the screen. More...
virtual QPixmap	grabWidget (const QWidget *widget, const QRect &rectangle=QRect()) const
	Returns a QPixmap generated from the part of the backing store corresponding to widget. More...
bool	hasFeature (WindowSurfaceFeature feature) const
virtual QPoint	offset (const QWidget *widget) const
	Returns the offset of widget in the coordinates of this window surface. More...
	QWindowSurface (QWidget *window, bool setDefaultSurface=true)
	Constructs an empty surface for the given top-level window. More...
QRect	rect (const QWidget *widget) const
	Returns the rectangle for widget in the coordinates of this window surface. More...
void	setStaticContents (const QRegion &region)
QRegion	staticContents () const
QWidget *	window () const
	Returns a pointer to the top-level window associated with this surface. More...
virtual	~QWindowSurface ()
	Destroys this surface. More...

Static Public Variables
static QGLFormat	surfaceFormat
static SwapMode	swapBehavior = QGLWindowSurface::AutomaticSwap
Static Public Variables inherited from QObject
static const QMetaObject	staticMetaObject
	This variable stores the meta-object for the class. More...

Private Slots
void	deleted (QObject *object)

Private Functions
void	hijackWindow (QWidget *widget)
bool	initializeOffscreenTexture (const QSize &size)

Properties
QGLWindowSurfacePrivate *	d_ptr

Additional Inherited Members
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 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)
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 Functions inherited from QWindowSurface
bool	hasStaticContents () const
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 83 of file qwindowsurface_gl_p.h.

Enumerations

SwapMode

enum QGLWindowSurface::SwapMode

Enumerator
AutomaticSwap
AlwaysFullSwap
AlwaysPartialSwap
KillSwap

Definition at line 113 of file qwindowsurface_gl_p.h.

{ AutomaticSwap, AlwaysFullSwap, AlwaysPartialSwap, KillSwap };

Constructors and Destructors

QGLWindowSurface()

QGLWindowSurface::QGLWindowSurface

(

QWidget *

window

)

Definition at line 345 of file qwindowsurface_gl.cpp.

    : QWindowSurface(window), d_ptr(new QGLWindowSurfacePrivate)
{
//    Q_ASSERT(window->isTopLevel());
    d_ptr->pb = 0;
    d_ptr->fbo = 0;
    d_ptr->ctx = 0;
    d_ptr->tex_id = 0;
#if defined (QT_OPENGL_ES_2)
    d_ptr->tried_fbo = true;
    d_ptr->tried_pb = true;
#else
    d_ptr->tried_fbo = false;
    d_ptr->tried_pb = false;
#endif
    d_ptr->destructive_swap_buffers = qgetenv("QT_GL_SWAPBUFFER_PRESERVE").isNull();
    d_ptr->glDevice.d = d_ptr;
    d_ptr->q_ptr = this;
    d_ptr->geometry_updated = false;
    d_ptr->did_paint = false;
    d_ptr->swap_region_support = false;
}

~QGLWindowSurface()

QGLWindowSurface::~QGLWindowSurface

(

)

Definition at line 368 of file qwindowsurface_gl.cpp.

{
    if (d_ptr->ctx)
        glDeleteTextures(1, &d_ptr->tex_id);
#ifndef Q_WS_QPA // Don't delete the contexts. Destroying the window does that for us
    foreach(QGLContext **ctx, d_ptr->contexts) {
        delete *ctx;
        *ctx = 0;
    }
#endif
    delete d_ptr->pb;
    delete d_ptr->fbo;
    delete d_ptr;

    if (QGLGlobalShareWidget::cleanedUp)
        return;

#ifdef Q_OS_SYMBIAN
    // Destroy the context if necessary.
    if (qt_gl_share_widget() && !qt_gl_share_context()->isSharing())
        qt_destroy_gl_share_widget();
#endif
}

Functions

beginPaint()

void QGLWindowSurface::beginPaint ( const QRegion &  region )

virtual

This function is called before painting onto the surface begins, with the region in which the painting will occur.

See also

endPaint(), paintDevice()

Reimplemented from QWindowSurface.

Definition at line 511 of file qwindowsurface_gl.cpp.

{
    d_ptr->did_paint = true;
    updateGeometry();

    int clearFlags = 0;

    QGLContext *ctx = reinterpret_cast<QGLContext *>(window()->d_func()->extraData()->glContext);

    if (!ctx)
        return;

    if (ctx->d_func()->workaround_needsFullClearOnEveryFrame)
        clearFlags = GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT;
    else if (ctx->format().alpha())
        clearFlags = GL_COLOR_BUFFER_BIT;

    if (clearFlags) {
        if (d_ptr->fbo)
            d_ptr->fbo->bind();

        glClearColor(0.0, 0.0, 0.0, 0.0);
        glClear(clearFlags);

        if (d_ptr->fbo)
            d_ptr->fbo->release();
    }
}

buffer()

QImage * QGLWindowSurface::buffer ( const QWidget *  widget )

virtual

Returns a QImage pointer which represents the actual buffer the widget is drawn into or 0 if this is unavailable.

You must call beginPaint() before you call this function and the returned pointer is only valid until endPaint() is called.

Reimplemented from QWindowSurface.

Definition at line 1153 of file qwindowsurface_gl.cpp.

{
    QImage image;

    if (d_ptr->pb)
        image = d_ptr->pb->toImage();
    else if (d_ptr->fbo)
        image = d_ptr->fbo->toImage();

    if (image.isNull())
        return 0;

    QRect rect = widget->rect();
    rect.translate(widget->mapTo(widget->window(), QPoint()));

    QImage subImage = image.copy(rect);
    d_ptr->buffers << subImage;
    return &d_ptr->buffers.last();
}

context()

QGLContext * QGLWindowSurface::context

(

)

const

Definition at line 482 of file qwindowsurface_gl.cpp.

Referenced by endPaint(), and flush().

{
    return d_ptr->ctx;
}

deleted

void QGLWindowSurface::deleted ( QObject *  object )

privateslot

Definition at line 392 of file qwindowsurface_gl.cpp.

Referenced by hijackWindow().

{
    QWidget *widget = qobject_cast<QWidget *>(object);
    if (widget) {
        if (widget == window()) {
            // Make sure that the fbo is destroyed before destroying its context.
            delete d_ptr->fbo;
            d_ptr->fbo = 0;
        }

#ifndef Q_WS_QPA //no need to specifically delete the QGLContext as it will be deleted by QWidget
        QWidgetPrivate *widgetPrivate = widget->d_func();
        if (widgetPrivate->extraData()) {
            union { QGLContext **ctxPtrPtr; void **voidPtrPtr; };
            voidPtrPtr = &widgetPrivate->extraData()->glContext;
            int index = d_ptr->contexts.indexOf(ctxPtrPtr);
            if (index != -1) {
                delete *ctxPtrPtr;
                *ctxPtrPtr = 0;
                d_ptr->contexts.removeAt(index);
            }
        }
#endif
    }
}

endPaint()

void QGLWindowSurface::endPaint ( const QRegion &  region )

virtual

This function is called after painting onto the surface has ended, with the region in which the painting was performed.

See also

beginPaint(), paintDevice()

Reimplemented from QWindowSurface.

Definition at line 540 of file qwindowsurface_gl.cpp.

{
    if (context())
        d_ptr->paintedRegion |= rgn;

    d_ptr->buffers.clear();
}

features()

QWindowSurface::WindowSurfaceFeatures QGLWindowSurface::features ( ) const

virtual

Reimplemented from QWindowSurface.

Definition at line 1173 of file qwindowsurface_gl.cpp.

{
    WindowSurfaceFeatures features = 0;
    if (!d_ptr->destructive_swap_buffers || d_ptr->swap_region_support)
        features |= PartialUpdates;
    if (!d_ptr->destructive_swap_buffers)
        features |= PreservedContents;
    return features;
}

flush()

void QGLWindowSurface::flush ( QWidget *  widget, const QRegion &  region, const QPoint &  offset  )

virtual

Flushes the given region from the specified widget onto the screen.

Note that the offset parameter is currently unused.

Implements QWindowSurface.

Definition at line 582 of file qwindowsurface_gl.cpp.

{
    //### Find out why d_ptr->geometry_updated isn't always false.
    // flush() should not be called when d_ptr->geometry_updated is true. It assumes that either
    // d_ptr->fbo or d_ptr->pb is allocated and has the correct size.
    if (d_ptr->geometry_updated)
        return;

    // did_paint is set to true in ::beginPaint. ::beginPaint means that we
    // at least cleared the background (= painted something). In EGL API it's a
    // mistake to call swapBuffers if nothing was painted unless
    // EGL_BUFFER_PRESERVED is set. This check protects the flush func from
    // being executed if it's for nothing.
    if (!d_ptr->destructive_swap_buffers && !d_ptr->did_paint)
        return;

#ifdef Q_OS_SYMBIAN
    if (window() != widget) {
        // For performance reasons we don't support
        // flushing native child widgets on Symbian.
        // It breaks overlapping native child widget
        // rendering in some cases but we prefer performance.
        return;
    }
#endif


    QWidget *parent = widget->internalWinId() ? widget : widget->nativeParentWidget();
    Q_ASSERT(parent);

#if !defined(Q_WS_QPA)
    if (!geometry().isValid())
        return;
#else
    if (!size().isValid())
        return;
#endif

    // Needed to support native child-widgets...
    hijackWindow(parent);

    QRect br = rgn.boundingRect().translated(offset);
    br = br.intersected(window()->rect());
    QPoint wOffset = qt_qwidget_data(parent)->wrect.topLeft();
    QRect rect = br.translated(-offset - wOffset);

    const GLenum target = GL_TEXTURE_2D;
    Q_UNUSED(target);

    if (QGLWindowSurface::swapBehavior == QGLWindowSurface::KillSwap)
        return;

    if (context()) {
        context()->makeCurrent();

        if (context()->format().doubleBuffer()) {
#if !defined(QT_OPENGL_ES_2)
            if (d_ptr->destructive_swap_buffers) {
                glBindTexture(target, d_ptr->tex_id);

                QVector<QRect> rects = d_ptr->paintedRegion.rects();
                for (int i = 0; i < rects.size(); ++i) {
                    QRect br = rects.at(i);
                    if (br.isEmpty())
                        continue;

                    const uint bottom = window()->height() - (br.y() + br.height());
                    glCopyTexSubImage2D(target, 0, br.x(), bottom, br.x(), bottom, br.width(), br.height());
                }

                glBindTexture(target, 0);

                QRegion dirtyRegion = QRegion(window()->rect()) - d_ptr->paintedRegion;

                if (!dirtyRegion.isEmpty()) {
                    glMatrixMode(GL_MODELVIEW);
                    glLoadIdentity();

                    glMatrixMode(GL_PROJECTION);
                    glLoadIdentity();
#ifndef QT_OPENGL_ES
                    glOrtho(0, window()->width(), window()->height(), 0, -999999, 999999);
#else
                    glOrthof(0, window()->width(), window()->height(), 0, -999999, 999999);
#endif
                    glViewport(0, 0, window()->width(), window()->height());

                    QVector<QRect> rects = dirtyRegion.rects();
                    glColor4f(1, 1, 1, 1);
                    for (int i = 0; i < rects.size(); ++i) {
                        QRect rect = rects.at(i);
                        if (rect.isEmpty())
                            continue;

                        drawTexture(rect, d_ptr->tex_id, window()->size(), rect);
                    }
                }
            }
#endif
            bool doingPartialUpdate = false;
            if (d_ptr->swap_region_support) {
                if (QGLWindowSurface::swapBehavior == QGLWindowSurface::AutomaticSwap)
                    doingPartialUpdate = br.width() * br.height() < parent->geometry().width() * parent->geometry().height() * 0.2;
                else if (QGLWindowSurface::swapBehavior == QGLWindowSurface::AlwaysPartialSwap)
                    doingPartialUpdate = true;
            }

            QGLContext *ctx = reinterpret_cast<QGLContext *>(parent->d_func()->extraData()->glContext);
#ifdef Q_OS_SYMBIAN
            if (!ctx)
                return;
#endif

            if (widget != window()) {
                if (initializeOffscreenTexture(window()->size()))
                    qWarning() << "QGLWindowSurface: Flushing to native child widget, may lead to significant performance loss";
                glBindTexture(target, d_ptr->tex_id);

                const uint bottom = window()->height() - (br.y() + br.height());
                glCopyTexSubImage2D(target, 0, br.x(), bottom, br.x(), bottom, br.width(), br.height());

                glBindTexture(target, 0);

                ctx->makeCurrent();
                if (doingPartialUpdate)
                    blitTexture(ctx, d_ptr->tex_id, parent->size(), window()->size(), rect, br);
                else
                    blitTexture(ctx, d_ptr->tex_id, parent->size(), window()->size(), parent->rect(), parent->rect().translated(offset + wOffset));
            }

            if (doingPartialUpdate)
                ctx->d_func()->swapRegion(br);
            else
                ctx->swapBuffers();

            d_ptr->paintedRegion = QRegion();
        } else {
            glFlush();
        }
        return;
    }

    QGLContext *previous_ctx = const_cast<QGLContext *>(QGLContext::currentContext());
    QGLContext *ctx = reinterpret_cast<QGLContext *>(parent->d_func()->extraData()->glContext);
#ifdef Q_OS_SYMBIAN
    if (!ctx)
        return;
#endif

    // QPainter::end() should have unbound the fbo, otherwise something is very wrong...
    Q_ASSERT(!d_ptr->fbo || !d_ptr->fbo->isBound());

    if (ctx != previous_ctx) {
        ctx->makeCurrent();
    }

    QSize size = widget->rect().size();
    if (d_ptr->destructive_swap_buffers && ctx->format().doubleBuffer()) {
        rect = parent->rect();
        br = rect.translated(wOffset + offset);
        size = parent->size();
    }

    glDisable(GL_SCISSOR_TEST);

    if (d_ptr->fbo && (QGLExtensions::glExtensions() & QGLExtensions::FramebufferBlit)) {
        const int h = d_ptr->fbo->height();

        const int sx0 = br.left();
        const int sx1 = br.left() + br.width();
        const int sy0 = h - (br.top() + br.height());
        const int sy1 = h - br.top();

        const int tx0 = rect.left();
        const int tx1 = rect.left() + rect.width();
        const int ty0 = parent->height() - (rect.top() + rect.height());
        const int ty1 = parent->height() - rect.top();

        if (window() == parent || d_ptr->fbo->format().samples() <= 1) {
            if (ctx->d_ptr->current_fbo != 0)
                glBindFramebuffer(GL_DRAW_FRAMEBUFFER_EXT, 0);

            glBindFramebuffer(GL_READ_FRAMEBUFFER_EXT, d_ptr->fbo->handle());

            glBlitFramebufferEXT(sx0, sy0, sx1, sy1,
                    tx0, ty0, tx1, ty1,
                    GL_COLOR_BUFFER_BIT,
                    GL_NEAREST);

            glBindFramebuffer(GL_READ_FRAMEBUFFER_EXT, 0);
        } else {
#ifndef Q_OS_SYMBIAN // We don't have FBO pool on Symbian
            // can't do sub-region blits with multisample FBOs
            QGLFramebufferObject *temp = qgl_fbo_pool()->acquire(d_ptr->fbo->size(), QGLFramebufferObjectFormat());

            glBindFramebuffer(GL_DRAW_FRAMEBUFFER_EXT, temp->handle());
            glBindFramebuffer(GL_READ_FRAMEBUFFER_EXT, d_ptr->fbo->handle());

            glBlitFramebufferEXT(0, 0, d_ptr->fbo->width(), d_ptr->fbo->height(),
                    0, 0, d_ptr->fbo->width(), d_ptr->fbo->height(),
                    GL_COLOR_BUFFER_BIT,
                    GL_NEAREST);

            glBindFramebuffer(GL_READ_FRAMEBUFFER_EXT, temp->handle());
            glBindFramebuffer(GL_DRAW_FRAMEBUFFER_EXT, 0);

            glBlitFramebufferEXT(sx0, sy0, sx1, sy1,
                    tx0, ty0, tx1, ty1,
                    GL_COLOR_BUFFER_BIT,
                    GL_NEAREST);

            glBindFramebuffer(GL_READ_FRAMEBUFFER_EXT, 0);

            qgl_fbo_pool()->release(temp);
#endif // Q_OS_SYMBIAN
        }

        ctx->d_ptr->current_fbo = 0;
    }
#if !defined(QT_OPENGL_ES_2)
    else {
        GLuint texture;
    if (d_ptr->fbo) {
        texture = d_ptr->fbo->texture();
    } else {
        d_ptr->pb->makeCurrent();
        glBindTexture(target, d_ptr->pb_tex_id);
        const uint bottom = window()->height() - (br.y() + br.height());
        glCopyTexSubImage2D(target, 0, br.x(), bottom, br.x(), bottom, br.width(), br.height());
        texture = d_ptr->pb_tex_id;
        glBindTexture(target, 0);
    }

        glDisable(GL_DEPTH_TEST);

        if (d_ptr->fbo) {
            d_ptr->fbo->release();
        } else {
            ctx->makeCurrent();
        }

        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();

        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
#ifndef QT_OPENGL_ES
        glOrtho(0, size.width(), size.height(), 0, -999999, 999999);
#else
        glOrthof(0, size.width(), size.height(), 0, -999999, 999999);
#endif
        glViewport(0, 0, size.width(), size.height());

        glColor4f(1, 1, 1, 1);
        drawTexture(rect, texture, window()->size(), br);

        if (d_ptr->fbo)
            d_ptr->fbo->bind();
    }
#else
    // OpenGL/ES 2.0 version of the fbo blit.
    else if (d_ptr->fbo) {
        Q_UNUSED(target);

        if (d_ptr->fbo->isBound())
            d_ptr->fbo->release();

        blitTexture(ctx, d_ptr->fbo->texture(), size, window()->size(), rect, br);
    }
#endif

    if (ctx->format().doubleBuffer())
        ctx->swapBuffers();
    else
        glFlush();

    d_ptr->did_paint = false;
}

hijackWindow()

void QGLWindowSurface::hijackWindow ( QWidget *  widget )

private

Definition at line 418 of file qwindowsurface_gl.cpp.

Referenced by flush(), and updateGeometry().

{
    QWidgetPrivate *widgetPrivate = widget->d_func();
    widgetPrivate->createExtra();
    if (widgetPrivate->extraData()->glContext)
        return;

    QGLContext *ctx = NULL;

    // For translucent top-level widgets we need alpha in the format.
    if (widget->testAttribute(Qt::WA_TranslucentBackground)) {
        QGLFormat modFormat(surfaceFormat);
        modFormat.setSampleBuffers(false);
        modFormat.setSamples(0);
        modFormat.setAlpha(true);
        ctx = new QGLContext(modFormat, widget);
    } else
        ctx = new QGLContext(surfaceFormat, widget);

    ctx->create(qt_gl_share_context());
#ifdef Q_OS_SYMBIAN
    if (!ctx->isValid()) {
        delete ctx;
        return;
    }
#endif
#ifndef QT_NO_EGL
    static bool checkedForNOKSwapRegion = false;
    static bool haveNOKSwapRegion = false;

    if (!checkedForNOKSwapRegion) {
        haveNOKSwapRegion = QEgl::hasExtension("EGL_NOK_swap_region2");
        checkedForNOKSwapRegion = true;

        if (haveNOKSwapRegion)
            qDebug() << "Found EGL_NOK_swap_region2 extension. Using partial updates.";
    }

    d_ptr->destructive_swap_buffers = true;
    if (ctx->d_func()->eglContext->configAttrib(EGL_SURFACE_TYPE)&EGL_SWAP_BEHAVIOR_PRESERVED_BIT) {
        EGLint swapBehavior;
        if (eglQuerySurface(ctx->d_func()->eglContext->display(), ctx->d_func()->eglSurface
                            , EGL_SWAP_BEHAVIOR, &swapBehavior)) {
            d_ptr->destructive_swap_buffers = (swapBehavior != EGL_BUFFER_PRESERVED);
        }
    }

    d_ptr->swap_region_support = haveNOKSwapRegion;
#endif

    widgetPrivate->extraData()->glContext = ctx;

    union { QGLContext **ctxPtrPtr; void **voidPtrPtr; };

    connect(widget, SIGNAL(destroyed(QObject*)), this, SLOT(deleted(QObject*)));

    voidPtrPtr = &widgetPrivate->extraData()->glContext;
    d_ptr->contexts << ctxPtrPtr;

#ifndef Q_OS_SYMBIAN
    qDebug() << "hijackWindow() context created for" << widget << d_ptr->contexts.size();
#endif
}

initializeOffscreenTexture()

bool QGLWindowSurface::initializeOffscreenTexture ( const QSize &  size )

private

Definition at line 1041 of file qwindowsurface_gl.cpp.

Referenced by flush(), and updateGeometry().

{
    if (size == d_ptr->textureSize)
        return false;

    glGenTextures(1, &d_ptr->tex_id);
    glBindTexture(GL_TEXTURE_2D, d_ptr->tex_id);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, size.width(), size.height(), 0, GL_RGB, GL_UNSIGNED_BYTE, 0);

    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glBindTexture(GL_TEXTURE_2D, 0);

    d_ptr->textureSize = size;
    return true;
}

paintDevice()

QPaintDevice * QGLWindowSurface::paintDevice ( )

virtual

Implement this function to return the appropriate paint device.

Implements QWindowSurface.

Definition at line 487 of file qwindowsurface_gl.cpp.

{
    updateGeometry();

#ifdef Q_OS_SYMBIAN
    // On symbian we always return glDevice, even if it's invalid
    return &d_ptr->glDevice;
#else
    if (d_ptr->pb)
        return d_ptr->pb;

    if (d_ptr->ctx)
        return &d_ptr->glDevice;

    QGLContext *ctx = reinterpret_cast<QGLContext *>(window()->d_func()->extraData()->glContext);
    ctx->makeCurrent();

    Q_ASSERT(d_ptr->fbo);
    return d_ptr->fbo;
#endif
}

scroll()

bool QGLWindowSurface::scroll ( const QRegion &  area, int  dx, int  dy  )

virtual

Scrolls the given area dx pixels to the right and dy downward; both dx and dy may be negative.

Returns true if the area was scrolled successfully; false otherwise.

Reimplemented from QWindowSurface.

Definition at line 1058 of file qwindowsurface_gl.cpp.

{
    // this code randomly fails currently for unknown reasons
    return false;

    if (!d_ptr->pb)
        return false;

    d_ptr->pb->makeCurrent();

    QRect br = area.boundingRect();

#if 0
    // ## workaround driver issue (scrolling by these deltas is unbearably slow for some reason)
    // ## maybe we should use glCopyTexSubImage insteadk
    if (dx == 1 || dx == -1 || dy == 1 || dy == -1 || dy == 2)
        return false;

    glRasterPos2i(br.x() + dx, br.y() + br.height() + dy);
    glCopyPixels(br.x(), d_ptr->pb->height() - (br.y() + br.height()), br.width(), br.height(), GL_COLOR);
    return true;
#endif

    const GLenum target = GL_TEXTURE_2D;

    glBindTexture(target, d_ptr->tex_id);
    glCopyTexImage2D(target, 0, GL_RGBA, br.x(), d_ptr->pb->height() - (br.y() + br.height()), br.width(), br.height(), 0);
    glBindTexture(target, 0);

    drawTexture(br.translated(dx, dy), d_ptr->tex_id, window()->size());

    return true;
}

setGeometry()

void QGLWindowSurface::setGeometry ( const QRect &  rect )

virtual

Sets the currently allocated area to be the given rect.

This function is called whenever area covered by the top-level window changes.

See also

geometry()

Reimplemented from QWindowSurface.

Definition at line 863 of file qwindowsurface_gl.cpp.

{
    QWindowSurface::setGeometry(rect);
    d_ptr->geometry_updated = true;
}

updateGeometry()

void QGLWindowSurface::updateGeometry

(

)

Definition at line 876 of file qwindowsurface_gl.cpp.

Referenced by beginPaint(), and paintDevice().

                                      {
    if (!d_ptr->geometry_updated)
        return;
    d_ptr->geometry_updated = false;

    bool hijack(true);
    QWidgetPrivate *wd = window()->d_func();
    if (wd->extraData() && wd->extraData()->glContext) {
#ifdef Q_OS_SYMBIAN // Symbian needs to recreate the context when native window size changes
        if (d_ptr->size != geometry().size()) {
            QGLContext *ctx = reinterpret_cast<QGLContext *>(wd->extraData()->glContext);

            if (ctx == QGLContext::currentContext())
                 ctx->doneCurrent();

            ctx->d_func()->destroyEglSurfaceForDevice();

            // Delete other contexts (shouldn't happen too often, if at all)
            while (d_ptr->contexts.size()) {
                QGLContext **ctxPtrPtr = d_ptr->contexts.takeFirst();
                if ((*ctxPtrPtr) != ctx)
                    delete *ctxPtrPtr;
            }
            union { QGLContext **ctxPtrPtr; void **voidPtrPtr; };
            voidPtrPtr = &wd->extraData()->glContext;
            d_ptr->contexts << ctxPtrPtr;

            ctx->d_func()->eglSurface = ctx->d_func()->eglContext->createSurface(window());

            // Swap behaviour has been checked already in previous hijackWindow call.
            // Reset swap behaviour based on that flag.
            if (d_ptr->destructive_swap_buffers) {
                eglSurfaceAttrib(QEgl::display(), ctx->d_func()->eglSurfaceForDevice(),
                                    EGL_SWAP_BEHAVIOR, EGL_BUFFER_DESTROYED);

                if (eglGetError() != EGL_SUCCESS)
                    qWarning("QGLWindowSurface::updateGeometry() - could not re-enable destroyed swap behaviour");
            } else {
                eglSurfaceAttrib(QEgl::display(), ctx->d_func()->eglSurfaceForDevice(),
                                    EGL_SWAP_BEHAVIOR, EGL_BUFFER_PRESERVED);

                if (eglGetError() != EGL_SUCCESS)
                    qWarning("QGLWindowSurface::updateGeometry() - could not re-enable preserved swap behaviour");                
            }
        }
#endif
        hijack = false; // we already have gl context for widget
    }

    if (hijack)
        hijackWindow(window());

    QGLContext *ctx = reinterpret_cast<QGLContext *>(wd->extraData()->glContext);
#ifdef Q_OS_SYMBIAN
    if (!ctx)
        return;
#endif
#ifdef Q_WS_MAC
    ctx->updatePaintDevice();
#endif

    QSize surfSize = geometry().size();

    if (surfSize.width() <= 0 || surfSize.height() <= 0)
        return;

    if (d_ptr->size == surfSize)
        return;

    d_ptr->size = surfSize;

    if (d_ptr->ctx) {
#ifndef QT_OPENGL_ES_2
        if (d_ptr->destructive_swap_buffers)
            initializeOffscreenTexture(surfSize);
#endif
        return;
    }

    const GLenum target = GL_TEXTURE_2D;
    if (d_ptr->destructive_swap_buffers
        && (QGLExtensions::glExtensions() & QGLExtensions::FramebufferObject)
        && (d_ptr->fbo || !d_ptr->tried_fbo)
        && qt_gl_preferGL2Engine())
    {
        d_ptr->tried_fbo = true;
        ctx->d_ptr->internal_context = true;
        ctx->makeCurrent();
        delete d_ptr->fbo;

        QGLFramebufferObjectFormat format;
        format.setAttachment(QGLFramebufferObject::CombinedDepthStencil);
        format.setInternalTextureFormat(GLenum(GL_RGBA));
        format.setTextureTarget(target);

        if (QGLExtensions::glExtensions() & QGLExtensions::FramebufferBlit)
            format.setSamples(8);

        d_ptr->fbo = new QGLFramebufferObject(surfSize, format);

        if (d_ptr->fbo->isValid()) {
            qDebug() << "Created Window Surface FBO" << surfSize
                     << "with samples" << d_ptr->fbo->format().samples();
            return;
        } else {
            qDebug() << "QGLWindowSurface: Failed to create valid FBO, falling back";
            delete d_ptr->fbo;
            d_ptr->fbo = 0;
        }
    }

#if !defined(QT_OPENGL_ES_2) && !defined(Q_WS_QPA) //QPA doesn't support pixelbuffers
    if (d_ptr->destructive_swap_buffers && (d_ptr->pb || !d_ptr->tried_pb)) {
        d_ptr->tried_pb = true;

        if (d_ptr->pb) {
            d_ptr->pb->makeCurrent();
            glDeleteTextures(1, &d_ptr->pb_tex_id);
        }

        delete d_ptr->pb;

        d_ptr->pb = new QGLPixelBuffer(surfSize.width(), surfSize.height(),
                                        QGLFormat(QGL::SampleBuffers | QGL::StencilBuffer | QGL::DepthBuffer),
                                        qt_gl_share_widget());

        if (d_ptr->pb->isValid()) {
            qDebug() << "Created Window Surface Pixelbuffer, Sample buffers:" << d_ptr->pb->format().sampleBuffers();
            d_ptr->pb->makeCurrent();

            glGenTextures(1, &d_ptr->pb_tex_id);
            glBindTexture(target, d_ptr->pb_tex_id);
            glTexImage2D(target, 0, GL_RGBA, surfSize.width(), surfSize.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);

            glTexParameterf(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
            glTexParameterf(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
            glBindTexture(target, 0);

            glMatrixMode(GL_PROJECTION);
            glLoadIdentity();
            glOrtho(0, d_ptr->pb->width(), d_ptr->pb->height(), 0, -999999, 999999);

            d_ptr->pb->d_ptr->qctx->d_func()->internal_context = true;
            return;
        } else {
            qDebug() << "QGLWindowSurface: Failed to create valid pixelbuffer, falling back";
            delete d_ptr->pb;
            d_ptr->pb = 0;
        }
    }
#endif // !defined(QT_OPENGL_ES_2) !defined(Q_WS_QPA)

    ctx->makeCurrent();

#ifndef QT_OPENGL_ES_2
    if (d_ptr->destructive_swap_buffers)
        initializeOffscreenTexture(surfSize);
#endif
#ifndef Q_OS_SYMBIAN
    qDebug() << "QGLWindowSurface: Using plain widget as window surface" << this;
#endif
    d_ptr->ctx = ctx;
    d_ptr->ctx->d_ptr->internal_context = true;
}

Properties

d_ptr

QGLWindowSurfacePrivate* QGLWindowSurface::d_ptr

private

Definition at line 123 of file qwindowsurface_gl_p.h.

Referenced by beginPaint(), buffer(), context(), deleted(), endPaint(), features(), flush(), hijackWindow(), initializeOffscreenTexture(), paintDevice(), QGLWindowSurface(), scroll(), setGeometry(), updateGeometry(), and ~QGLWindowSurface().

surfaceFormat

QGLFormat QGLWindowSurface::surfaceFormat

static

Definition at line 111 of file qwindowsurface_gl_p.h.

Referenced by hijackWindow(), QGLGraphicsSystem::QGLGraphicsSystem(), and QMeeGoGraphicsSystem::setTranslucent().

swapBehavior

QGLWindowSurface::SwapMode QGLWindowSurface::swapBehavior = QGLWindowSurface::AutomaticSwap

static

Definition at line 114 of file qwindowsurface_gl_p.h.

Referenced by hijackWindow().

---

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

• /src/opengl/qwindowsurface_gl_p.h
• /src/opengl/qwindowsurface_gl.cpp