QGLPaintDevice Class Reference

#include <qglpaintdevice_p.h>

Inheritance diagram for QGLPaintDevice:

Public Functions
virtual bool	alphaRequested () const
virtual void	beginPaint ()
virtual QGLContext *	context () const =0
int	devType () const
virtual void	endPaint ()
virtual void	ensureActiveTarget ()
virtual QGLFormat	format () const
virtual bool	isFlipped () const
	QGLPaintDevice ()
virtual QSize	size () const =0
virtual	~QGLPaintDevice ()
Public Functions inherited from QPaintDevice
int	colorCount () const
int	depth () const
virtual HDC	getDC () const
int	height () const
int	heightMM () const
int	logicalDpiX () const
int	logicalDpiY () const
QT_DEPRECATED int	numColors () const
virtual QPaintEngine *	paintEngine () const =0
bool	paintingActive () const
int	physicalDpiX () const
int	physicalDpiY () const
virtual void	releaseDC (HDC hdc) const
int	width () const
int	widthMM () const
virtual	~QPaintDevice ()

Static Public Functions
static QGLPaintDevice *	getDevice (QPaintDevice *)
Static Public Functions inherited from QPaintDevice
static QWSDisplay *	qwsDisplay ()

Protected Functions
int	metric (QPaintDevice::PaintDeviceMetric metric) const
Protected Functions inherited from QPaintDevice
	QPaintDevice ()

Protected Variables
GLuint	m_previousFBO
GLuint	m_thisFBO
Protected Variables inherited from QPaintDevice
ushort	painters

Additional Inherited Members
Public Types inherited from QPaintDevice
enum	PaintDeviceMetric {   PdmWidth = 1, PdmHeight, PdmWidthMM, PdmHeightMM,   PdmNumColors, PdmDepth, PdmDpiX, PdmDpiY,   PdmPhysicalDpiX, PdmPhysicalDpiY }
Related Functions inherited from QPaintDevice
const Q_GUI_EXPORT QX11Info *	qt_x11Info (const QPaintDevice *pd)
	Returns the QX11Info structure for the pd paint device. More...

Detailed Description

Definition at line 63 of file qglpaintdevice_p.h.

Constructors and Destructors

QGLPaintDevice()

QGLPaintDevice::QGLPaintDevice

(

)

Definition at line 57 of file qglpaintdevice.cpp.

    : m_thisFBO(0)
{
}

~QGLPaintDevice()

QGLPaintDevice::~QGLPaintDevice ( )

virtual

Definition at line 62 of file qglpaintdevice.cpp.

{
}

Functions

alphaRequested()

bool QGLPaintDevice::alphaRequested ( ) const

virtual

Reimplemented in QGLFBOGLPaintDevice, and QGLPixmapGLPaintDevice.

Definition at line 143 of file qglpaintdevice.cpp.

{
    return context()->d_func()->reqFormat.alpha();
}

beginPaint()

void QGLPaintDevice::beginPaint ( )

virtual

Reimplemented in QGLWidgetGLPaintDevice, QGLPixmapGLPaintDevice, QX11GLPixmapData, and QEglFSPaintDevice.

Definition at line 83 of file qglpaintdevice.cpp.

Referenced by QEglFSPaintDevice::beginPaint(), QX11GLPixmapData::beginPaint(), QGLPixmapGLPaintDevice::beginPaint(), QGLWidgetGLPaintDevice::beginPaint(), and QBBGLWindowSurface::paintDevice().

{
    // Make sure our context is the current one:
    QGLContext *ctx = context();
    if (ctx != QGLContext::currentContext())
        ctx->makeCurrent();

    // Record the currently bound FBO so we can restore it again
    // in endPaint() and bind this device's FBO
    //
    // Note: m_thisFBO could be zero if the paint device is not
    // backed by an FBO (e.g. window back buffer).  But there could
    // be a previous FBO bound to the context which we need to
    // explicitly unbind.  Otherwise the painting will go into
    // the previous FBO instead of to the window.
    m_previousFBO = ctx->d_func()->current_fbo;

    if (m_previousFBO != m_thisFBO) {
        ctx->d_ptr->current_fbo = m_thisFBO;
        glBindFramebuffer(GL_FRAMEBUFFER_EXT, m_thisFBO);
    }

    // Set the default fbo for the context to m_thisFBO so that
    // if some raw GL code between beginNativePainting() and
    // endNativePainting() calls QGLFramebufferObject::release(),
    // painting will revert to the window surface's fbo.
    ctx->d_ptr->default_fbo = m_thisFBO;
}

context()

virtual QGLContext* QGLPaintDevice::context ( ) const

pure virtual

Implemented in QGLPBufferGLPaintDevice, QGLFBOGLPaintDevice, QGLWidgetGLPaintDevice, QGLPixmapGLPaintDevice, EAGLPaintDevice, QX11GLPixmapData, QGLWindowSurfaceGLPaintDevice, QBBGLPaintDevice, and QEglFSPaintDevice.

Referenced by alphaRequested(), beginPaint(), QGLWidgetGLPaintDevice::beginPaint(), QOpenGLPaintEnginePrivate::composite(), QOpenGLPaintEnginePrivate::createGradientPaletteTexture(), QOpenGLPaintEnginePrivate::drawOffscreenPath(), endPaint(), ensureActiveTarget(), format(), and QOpenGLPaintEnginePrivate::strokeLines().

devType()

int QGLPaintDevice::devType ( ) const

inlinevirtual

Reimplemented from QPaintDevice.

Reimplemented in EAGLPaintDevice.

Definition at line 69 of file qglpaintdevice_p.h.

{return QInternal::OpenGL;}

endPaint()

void QGLPaintDevice::endPaint ( )

virtual

Reimplemented in QGLPBufferGLPaintDevice, QGLWidgetGLPaintDevice, and QGLPixmapGLPaintDevice.

Definition at line 126 of file qglpaintdevice.cpp.

Referenced by QGLPixmapGLPaintDevice::endPaint(), QGLWidgetGLPaintDevice::endPaint(), QGLPBufferGLPaintDevice::endPaint(), and QBBGLWindowSurface::paintDevice().

{
    // Make sure the FBO bound at beginPaint is re-bound again here:
    QGLContext *ctx = context();
    if (m_previousFBO != ctx->d_func()->current_fbo) {
        ctx->d_ptr->current_fbo = m_previousFBO;
        glBindFramebuffer(GL_FRAMEBUFFER_EXT, m_previousFBO);
    }

    ctx->d_ptr->default_fbo = 0;
}

ensureActiveTarget()

void QGLPaintDevice::ensureActiveTarget ( )

virtual

Definition at line 112 of file qglpaintdevice.cpp.

{
    QGLContext* ctx = context();
    if (ctx != QGLContext::currentContext())
        ctx->makeCurrent();

    if (ctx->d_ptr->current_fbo != m_thisFBO) {
        ctx->d_ptr->current_fbo = m_thisFBO;
        glBindFramebuffer(GL_FRAMEBUFFER_EXT, m_thisFBO);
    }

    ctx->d_ptr->default_fbo = m_thisFBO;
}

format()

QGLFormat QGLPaintDevice::format ( ) const

virtual

Reimplemented in QGLFBOGLPaintDevice.

Definition at line 138 of file qglpaintdevice.cpp.

Referenced by QGLPixelBufferPrivate::common_init(), QGL2PaintEngineExPrivate::fill(), and metric().

{
    return context()->format();
}

getDevice()

QGLPaintDevice * QGLPaintDevice::getDevice ( QPaintDevice *  pd )

static

Definition at line 206 of file qglpaintdevice.cpp.

Referenced by QOpenGLPaintEngine::begin(), QGL2PaintEngineEx::begin(), and QGLOffscreen::setDevice().

{
    QGLPaintDevice* glpd = 0;

    switch(pd->devType()) {
        case QInternal::Widget:
            // Should not be called on a non-gl widget:
            Q_ASSERT(qobject_cast<QGLWidget*>(static_cast<QWidget*>(pd)));
            glpd = &(static_cast<QGLWidget*>(pd)->d_func()->glDevice);
            break;
        case QInternal::Pbuffer:
            glpd = &(static_cast<QGLPixelBuffer*>(pd)->d_func()->glDevice);
            break;
        case QInternal::FramebufferObject:
            glpd = &(static_cast<QGLFramebufferObject*>(pd)->d_func()->glDevice);
            break;
        case QInternal::Pixmap: {
#if !defined(QT_OPENGL_ES_1)
            QPixmapData* pmd = static_cast<QPixmap*>(pd)->pixmapData();
            if (pmd->classId() == QPixmapData::OpenGLClass)
                glpd = static_cast<QGLPixmapData*>(pmd)->glDevice();
#ifdef Q_WS_X11
            else if (pmd->classId() == QPixmapData::X11Class)
                glpd = static_cast<QX11GLPixmapData*>(pmd);
#endif
            else
                qWarning("Pixmap type not supported for GL rendering");
#else
            qWarning("Pixmap render targets not supported on OpenGL ES 1.x");
#endif
            break;
        }
        default:
            qWarning("QGLPaintDevice::getDevice() - Unknown device type %d", pd->devType());
            break;
    }

    return glpd;
}

isFlipped()

bool QGLPaintDevice::isFlipped ( ) const

virtual

Definition at line 148 of file qglpaintdevice.cpp.

Referenced by QGL2PaintEngineExPrivate::updateBrushUniforms(), and QGL2PaintEngineExPrivate::updateMatrix().

{
    return false;
}

metric()

int QGLPaintDevice::metric ( QPaintDevice::PaintDeviceMetric  metric ) const

protectedvirtual

Reimplemented from QPaintDevice.

Reimplemented in QGLWindowSurfaceGLPaintDevice.

Definition at line 66 of file qglpaintdevice.cpp.

{
    switch(metric) {
    case PdmWidth:
        return size().width();
    case PdmHeight:
        return size().height();
    case PdmDepth: {
        const QGLFormat f = format();
        return f.redBufferSize() + f.greenBufferSize() + f.blueBufferSize() + f.alphaBufferSize();
    }
    default:
        qWarning("QGLPaintDevice::metric() - metric %d not known", metric);
        return 0;
    }
}

size()

virtual QSize QGLPaintDevice::size ( ) const

pure virtual

Implemented in QGLPBufferGLPaintDevice, QGLFBOGLPaintDevice, QGLWidgetGLPaintDevice, QGLPixmapGLPaintDevice, EAGLPaintDevice, QX11GLPixmapData, QGLWindowSurfaceGLPaintDevice, QBBGLPaintDevice, and QEglFSPaintDevice.

Referenced by QOpenGLPaintEnginePrivate::copyDrawable(), QOpenGLPaintEnginePrivate::drawItem(), QOpenGLPaintEnginePrivate::fillVertexArray(), metric(), and QOpenGLPaintEnginePrivate::updateDepthClip().

Properties

m_previousFBO

GLuint QGLPaintDevice::m_previousFBO

protected

Definition at line 86 of file qglpaintdevice_p.h.

Referenced by beginPaint(), and endPaint().

m_thisFBO

GLuint QGLPaintDevice::m_thisFBO

protected

Definition at line 87 of file qglpaintdevice_p.h.

Referenced by beginPaint(), and ensureActiveTarget().

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

• /src/opengl/qglpaintdevice_p.h
• /src/opengl/qglpaintdevice.cpp