QMacCGContext Class Reference

#include <qt_mac_p.h>

Public Functions
bool	isNull () const
	operator CGContextRef ()
QMacCGContext &	operator= (const QMacCGContext &copy)
QMacCGContext &	operator= (CGContextRef cg)
	QMacCGContext (QPainter *p)
	QMacCGContext ()
	QMacCGContext (const QPaintDevice *pdev)
	QMacCGContext (CGContextRef cg, bool takeOwnership=false)
	QMacCGContext (const QMacCGContext &copy)
	~QMacCGContext ()

Properties
CGContextRef	context

Detailed Description

Definition at line 170 of file qt_mac_p.h.

Constructors and Destructors

QMacCGContext() [1/5]

QMacCGContext::QMacCGContext

(

QPainter *

p

)

Definition at line 91 of file qpaintengine_mac.cpp.

{
    QPaintEngine *pe = p->paintEngine();
    if (pe->type() == QPaintEngine::MacPrinter)
        pe = static_cast<QMacPrintEngine*>(pe)->paintEngine();
    pe->syncState();
    context = 0;
    if(pe->type() == QPaintEngine::CoreGraphics)
        context = static_cast<QCoreGraphicsPaintEngine*>(pe)->handle();

    int devType = p->device()->devType();
    if (pe->type() == QPaintEngine::Raster
            && (devType == QInternal::Widget || devType == QInternal::Pixmap || devType == QInternal::Image)) {

        extern CGColorSpaceRef qt_mac_colorSpaceForDeviceType(const QPaintDevice *paintDevice);
        CGColorSpaceRef colorspace = qt_mac_colorSpaceForDeviceType(pe->paintDevice());
        uint flags = kCGImageAlphaPremultipliedFirst;
#ifdef kCGBitmapByteOrder32Host //only needed because CGImage.h added symbols in the minor version
        flags |= kCGBitmapByteOrder32Host;
#endif
        const QImage *image = (const QImage *) pe->paintDevice();

        context = CGBitmapContextCreate((void *) image->bits(), image->width(), image->height(),
                                        8, image->bytesPerLine(), colorspace, flags);

        CGContextTranslateCTM(context, 0, image->height());
        CGContextScaleCTM(context, 1, -1);

        if (devType == QInternal::Widget) {
            QRegion clip = p->paintEngine()->systemClip();
            QTransform native = p->deviceTransform();
            QTransform logical = p->combinedTransform();

            if (p->hasClipping()) {
                QRegion r = p->clipRegion();
                r.translate(native.dx(), native.dy());
                if (clip.isEmpty())
                    clip = r;
                else
                    clip &= r;
            }
            qt_mac_clip_cg(context, clip, 0);

            CGContextTranslateCTM(context, native.dx(), native.dy());
        }
    } else {
        CGContextRetain(context);
    }
}

QMacCGContext() [2/5]

QMacCGContext::QMacCGContext ( )

inline

Definition at line 175 of file qt_mac_p.h.

{ context = 0; }

QMacCGContext() [3/5]

QMacCGContext::QMacCGContext ( const QPaintDevice *  pdev )

inline

Definition at line 176 of file qt_mac_p.h.

                                                   {
        extern CGContextRef qt_mac_cg_context(const QPaintDevice *);
        context = qt_mac_cg_context(pdev);
    }

QMacCGContext() [4/5]

QMacCGContext::QMacCGContext ( CGContextRef  cg, bool  takeOwnership = false  )

inline

Definition at line 180 of file qt_mac_p.h.

                                                                    {
        context = cg;
        if(!takeOwnership)
            CGContextRetain(context);
    }

QMacCGContext() [5/5]

QMacCGContext::QMacCGContext ( const QMacCGContext &  copy )

inline

Definition at line 185 of file qt_mac_p.h.

: context(0) { *this = copy; }

~QMacCGContext()

QMacCGContext::~QMacCGContext ( )

inline

Definition at line 186 of file qt_mac_p.h.

                            {
        if(context)
            CGContextRelease(context);
    }

Functions

isNull()

bool QMacCGContext::isNull ( ) const

inline

Definition at line 190 of file qt_mac_p.h.

{ return context; }

operator CGContextRef()

QMacCGContext::operator CGContextRef ( )

inline

Definition at line 191 of file qt_mac_p.h.

{ return context; }

operator=() [1/2]

QMacCGContext& QMacCGContext::operator= ( const QMacCGContext &  copy )

inline

Definition at line 192 of file qt_mac_p.h.

                                                               {
        if(context)
            CGContextRelease(context);
        context = copy.context;
        CGContextRetain(context);
        return *this;
    }

operator=() [2/2]

QMacCGContext& QMacCGContext::operator= ( CGContextRef  cg )

inline

Definition at line 199 of file qt_mac_p.h.

                                                     {
        if(context)
            CGContextRelease(context);
        context = cg;
        CGContextRetain(context); //we do not take ownership
        return *this;
    }

Properties

context

CGContextRef QMacCGContext::context

private

Definition at line 172 of file qt_mac_p.h.

Referenced by operator=(), and QMacCGContext().

---

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

• /src/gui/kernel/qt_mac_p.h
• /src/gui/painting/qpaintengine_mac.cpp