qrasterwindow.cpp

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1 /**************************************************************************** -

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6 ** This file is part of the QtGui module of the Qt Toolkit. -

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25 ** GNU General Public License Usage -

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36 ** $QT_END_LICENSE$ -

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38 ****************************************************************************/ -

39 -

40 #include "qrasterwindow.h" -

41 -

42 #include <QtGui/private/qpaintdevicewindow_p.h> -

43 -

44 #include <QtGui/QBackingStore> -

45 #include <QtGui/QPainter> -

46 -

47 QT_BEGIN_NAMESPACE -

48 -

49 /*! -

50 \class QRasterWindow -

51 \inmodule QtGui -

52 \since 5.4 -

53 \brief QRasterWindow is a convenience class for using QPainter on a QWindow -

54 -

55 QRasterWindow is a QWindow with a raster-based, non-OpenGL surface. On top of -

56 the functionality offered by QWindow, QRasterWindow adds a virtual -

57 paintEvent() function and the possibility to open a QPainter on itself. The -

58 underlying paint engine will be the raster one, meaning that all drawing will -

59 happen on the CPU. For performing accelerated, OpenGL-based drawing, use -

60 QOpenGLWindow instead. -

61 -

62 Internally the class is thin wrapper for QWindow and QBackingStore -

63 and is very similar to the \l{Raster Window Example}{Raster Window -

64 Example} that uses these classes directly. -

65 -

66 \sa QPaintDeviceWindow::paintEvent(), QPaintDeviceWindow::update() -

67 */ -

68 -

69 class QRasterWindowPrivate : public QPaintDeviceWindowPrivate -

70 { -

71 Q_DECLARE_PUBLIC(QRasterWindow) -

72 public: -

73 void beginPaint(const QRegion &region) Q_DECL_OVERRIDE -

74 { -

75 Q_Q(QRasterWindow); -

76 const QSize size = q->size(); -

if (backingstore->size() != q->size())) {

backingstore->size() != size	Description
TRUE	never evaluated
FALSE	never evaluated

78 backingstore->resize(q->size());); -

79 markWindowAsDirty(); -

}

never executed: end of block

81 backingstore->beginPaint(region); -

}

never executed: end of block

83 -

84 void endPaint() Q_DECL_OVERRIDE -

85 { -

86 backingstore->endPaint(); -

87 } -

88 -

89 void flush(const QRegion &region) Q_DECL_OVERRIDE -

90 { -

91 Q_Q(QRasterWindow); -

92 backingstore->flush(region, q); -

93 } -

94 -

95 QScopedPointer<QBackingStore> backingstore; -

96 }; -

97 -

98 /*! -

99 Constructs a new QRasterWindow with \a parent. -

100 */ -

101 QRasterWindow::QRasterWindow(QWindow *parent) -

102 : QPaintDeviceWindow(*(new QRasterWindowPrivate), parent) -

103 { -

104 setSurfaceType(QSurface::RasterSurface); -

105 d_func()->backingstore.reset(new QBackingStore(this)); -

106 } -

107 -

108 /*! -

109 \internal -

110 */ -

111 int QRasterWindow::metric(PaintDeviceMetric metric) const -

112 { -

113 Q_D(const QRasterWindow); -

114 -

115 switch (metric) { -

116 case PdmDepth: -

117 return d->backingstore->paintDevice()->depth(); -

118 default: -

119 break; -

120 } -

121 return QPaintDeviceWindow::metric(metric); -

122 } -

123 -

124 /*! -

125 \internal -

126 */ -

127 QPaintDevice *QRasterWindow::redirected(QPoint *) const -

128 { -

129 Q_D(const QRasterWindow); -

130 return d->backingstore->paintDevice(); -

131 } -

132 -

133 QT_END_NAMESPACE -

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