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    16 ** GNU Lesser General Public License Usage

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    40 ****************************************************************************/

    41 

    42 #include "qwindowsurface_mac_p.h"

    43 

    44 #include <private/qt_mac_p.h>

    45 #include <private/qt_cocoa_helpers_mac_p.h>

    46 #include <QtGui/qwidget.h>

    47 

    48 QT_BEGIN_NAMESPACE

    49 

    50 struct QMacWindowSurfacePrivate

    51 {

    52     QWidget *widget;

    53     QPixmap device;

    54 };

    55 

    56 QMacWindowSurface::QMacWindowSurface(QWidget *widget)

    57     : QWindowSurface(widget), d_ptr(new QMacWindowSurfacePrivate)

    58 {

    59     d_ptr->widget = widget;

    60 }

    61 

    62 QMacWindowSurface::~QMacWindowSurface()

    63 {

    64     delete d_ptr;

    65 }

    66 

    67 QPaintDevice *QMacWindowSurface::paintDevice()

    68 {

    69     return &d_ptr->device;

    70 }

    71 

    72 void QMacWindowSurface::flush(QWidget *widget, const QRegion &rgn, const QPoint &offset)

    73 {

    74     Q_UNUSED(offset);

    75 

    76     // Get a context for the widget.

    77 #ifndef QT_MAC_USE_COCOA

    78     CGContextRef context;

    79     CGrafPtr port = GetWindowPort(qt_mac_window_for(widget));

    80     QDBeginCGContext(port, &context);

    81 #else

    82     extern CGContextRef qt_mac_graphicsContextFor(QWidget *);

    83     CGContextRef context = qt_mac_graphicsContextFor(widget);

    84 #endif

    85     CGContextSaveGState(context);

    86 

    87     // Flip context.

    88     CGContextTranslateCTM(context, 0, widget->height());

    89     CGContextScaleCTM(context, 1, -1);

    90 

    91     // Clip to region.

    92     const QVector<QRect> &rects = rgn.rects();

    93     for (int i = 0; i < rects.size(); ++i) {

    94         const QRect &rect = rects.at(i);

    95         CGContextAddRect(context, CGRectMake(rect.x(), rect.y(), rect.width(), rect.height()));

    96     }

    97     CGContextClip(context);

    98 

    99     // Draw the image onto the window.

   100     const CGRect dest = CGRectMake(0, 0, widget->width(), widget->height());

   101     const CGImageRef image = d_ptr->device.toMacCGImageRef();

   102     qt_mac_drawCGImage(context, &dest, image);

   103     CFRelease(image);

   104 

   105     // Restore context.

   106     CGContextRestoreGState(context);

   107 #ifndef QT_MAC_USE_COCOA

   108     QDEndCGContext(port, &context);

   109 #else

   110     CGContextFlush(context);

   111 #endif

   112 }

   113 

   114 void QMacWindowSurface::setGeometry(const QRect &rect)

   115 {

   116     QWindowSurface::setGeometry(rect);

   117     const QSize size = rect.size();

   118     if (d_ptr->device.size() != size)

   119         d_ptr->device = QPixmap(size);

   120 }

   121 

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

   123 {

   124     if (d_ptr->device.size().isNull())

   125         return false;

   126 

   127     QCFType<CGImageRef> image = d_ptr->device.toMacCGImageRef();

   128     const QRect rect(area.boundingRect());

   129     const CGRect dest = CGRectMake(rect.x(), rect.y(), rect.width(), rect.height());

   130     QCFType<CGImageRef> subimage = CGImageCreateWithImageInRect(image, dest);

   131     QCFType<CGContextRef> context = qt_mac_cg_context(&d_ptr->device);

   132     CGContextTranslateCTM(context, dx, dy);

   133     qt_mac_drawCGImage(context, &dest, subimage);

   134     return true;

   135 }

   136 

   137 QT_END_NAMESPACE